Lifelong learning

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Lifelong_learning

 

Lifelong learning is the "ongoing, voluntary, and self-motivated" pursuit of knowledge for either personal or professional reasons. Therefore, it not only enhances social inclusion, active citizenship, and personal development, but also self-sustainability, as well as competitiveness and employability.

In some contexts, the term "lifelong learning" evolved from the term "life-long learners", created by Leslie Watkins and used by Professor Clint Taylor (CSULA) and Superintendent for the Temple City Unified School District's mission statement in 1993, the term recognizes that learning is not confined to childhood or the classroom but takes place throughout life and in a range of situations.

In other contexts, the term "lifelong learning" evolved organically. The first lifelong learning institute began at The New School for Social Research (now New School University) in 1962 as an experiment in "learning in retirement". Later, after similar groups formed across the United States, many chose the name "lifelong learning institute" to be inclusive of nonretired persons in the same age range.

During the last fifty years, constant scientific and technological innovation and change has had profound effects on how learning is understood. Learning can no longer be divided into a place and time to acquire knowledge (school) and a place and time to apply the knowledge acquired (the workplace). Instead, learning can be seen as something that takes place on an ongoing basis from our daily interactions with others and with the world around us. It can create and shapeshift into the form of formal learning or informal learning, or self-directed learning. Allen Tough (1979), Canadian educator and researcher, asserts that almost 70% of learning projects are self-planned.

Links to theory

Two theories of particular relevance when considering lifelong learning are cognitivism and constructivism. Cognitivism, most notably Gestalt theory, speaks of learning as making sense of the relationship between what is old and what is new. Similarly, Constructivist theory states that "knowledge is not passively received from the world or from authoritative sources but constructed by individuals or groups making sense of their experiential worlds". Constructivism lends itself well to Lifelong learning as it brings together learning from many different sources including life experiences. 

Learning economy

Lifelong learning is being recognized by traditional colleges and universities as valid in addition to degree attainment. Some learning is accomplished in segments or interest categories and can still be valuable to the individual and community. The economic impact of educational institutions at all levels will remain significant as individuals continue formal studies and pursue interest-based subjects. Institutions produce educated citizens who buy goods and services in the community and the education facilities and personnel generate economic activity during the operations and institutional activities. Similar to health facilities, educational institutions are among the top employers in many cities and towns of the world. Whether brick-and-mortar or distance education institutions, there is a great economic impact worldwide from learning, including lifelong learning, for all age groups. The lifelong learners, including persons with academic or professional credentials, tend to find higher-paying occupations, leaving monetary, cultural, and entrepreneurial impressions on communities, according to educator Cassandra B. Whyte.

Contexts

Although the term is widely used in a variety of contexts, its meaning is often unclear. A learning approach that can be used to define lifelong learning is heutagogy.

There are several established contexts for lifelong learning beyond traditional "brick and mortar" schooling:

• Home schooling involves learning to learn or the development of informal learning patterns
• Adult education or the acquisition of formal qualifications or work and leisure skills later in life
• Continuing education which often describes extension or not-for-credit courses offered by higher education institutions
• Lifelong learning institutes, which are groups over 50 years of age which meet for noncredit college-level study for intellectual challenge and social enjoyment
• Knowledge work, which includes professional development and on-the-job training
• Personal learning environments or self-directed learning using a range of sources and tools including online applications

E-learning is available at most colleges and universities or to individuals learning independently. There are even online courses being offered for free by many institutions. 

One new (2008 and beyond) expression of lifelong learning is the massive open online course (a MOOC), in which a teacher or team offers a syllabus and some direction for the participation of hundreds, sometimes thousands, of learners. Most MOOCs do not offer typical "credit" for courses taken, which is why they are interesting and useful examples of lifelong learning. 

Emerging technologies

Lifelong learning is defined as "all learning activity undertaken throughout life, with the aim of improving knowledge, skills and competences within a personal, civic, social and/or employment-related perspective". It is often considered learning that occurs after the formal education years of childhood (where learning is instructor-driven—pedagogical) and into adulthood (where the learning is individually-driven—andragogical). It is sought out naturally through life experiences as the learner seeks to gain knowledge for professional or personal reasons.'Knowledge results from the combination of grasping experience and transforming it' (Kolb 1984: 41). The concept of lifelong learning has become of vital importance with the emergence of new technologies that change how we receive and gather information, collaborate with others, and communicate. 

Assistive technology

As technology rapidly changes, individuals must adapt and learn to meet everyday demands. However, throughout life, an individual's functional capacities may also change. Assistive technologies are also important considerations under the umbrella of emerging technology and lifelong learning. Access to informal and formal learning opportunities for individuals with disabilities may be dependent upon low and high tech assistive technology. 

Web 2.0

The emergence of Web 2.0 technologies has great potential to support lifelong learning endeavors, allowing for informal, just-in-time, day-to-day learning. Constant change is emerging as the new normal. To thrive, organizations and individuals must be able to adjust, and enhance their knowledge and skills to meet evolving needs. This means the most important thing someone can learn is how to learn. An understanding of web 2.0 tools is critical to keeping up with a changing world and the information explosion.

Workplace learning

Professions typically recognize the importance of developing practitioners becoming lifelong learners. Nowadays, formal training is only a beginning. Knowledge accumulates at such a fast rate that one must continue to learn to be effective (Williams, 2001). Many licensed professions mandate that their members continue learning to maintain a license. (Merriam, Caffarella, & Baumgartner, 2007). Having said this, what are the characteristics or skills that a lifelong learner must develop. Reflective learning and critical thinking can help a learner to become more self-reliant through learning how to learn, thus making them better able to direct, manage, and control their own learning process (Candy, 1990). Sipe (1995) studied experimentally "open" teachers and found that they valued self-directed learning, collaboration, reflection, and challenge; risk taking in their learning was seen as an opportunity, not a threat. Dunlap and Grabinger (2003) say that for higher education students to be lifelong learners, they must develop a capacity for self-direction, metacognition awareness, and a disposition toward learning (Merriam, Caffarella, & Baumgartner, 2007).

Metacognition

While the study of metacognition originally gave educational psychologists insights into what differentiated successful students from their less successful peers, it is increasingly being used to inform teaching that aims to make students more aware of their learning processes, and show them how to regulate those processes for more effective learning throughout their lives.

Educators can employ Cognitive Strategy Instruction (CSI) as a means to help learners develop their metacognition. Again, learners who are better equipped to create learning strategies for themselves will have more success in achieving their cognitive goals.

As lifelong learning is "lifelong, lifewide, voluntary, and self-motivated" learning to learn, that is, learning how to recognize learning strategies, and monitor and evaluate learning, is a pre-condition for lifelong learning. Metacognition is an essential first step in developing lifelong learning. 

Delors Report and the four pillars of learning

The Delors Report proposed an integrated vision of education based on two key paradigms: lifelong learning and the four pillars of learning. The report proposed a holistic conceptual framework of learning, that of the 'four pillars of learning'. It argued that formal education tends to emphasize the acquisition of knowledge to the detriment of other types of learning essential to sustaining human development. It stressed the need to think of learning over the life course, and to address how everyone can develop relevant skills, knowledge and attitudes for work, citizenship and personal fulfillment. The four pillars of learning are:

1. Learning to know
2. Learning to do
3. Learning to be
4. Learning to live together

It is important to note that the four pillars of learning were envisaged against the backdrop of the notion of 'lifelong learning', itself an adaptation of the concept of 'lifelong education' as initially conceptualized in the 1972 Faure publication Learning to Be.

In practice

In India and elsewhere, the "University of the Third Age" (U3A) provides an example of the almost spontaneous emergence of autonomous learning groups accessing the expertise of their own members in the pursuit of knowledge and shared experience. No prior qualifications and no subsequent certificates feature in this approach to learning for its own sake and, as participants testify, engagement in this type of learning in later life can indeed 'prolong active life'.

In Sweden the successful concept of study circles, an idea launched almost a century ago, still represents a large portion of the adult education provision. The concept has since spread, and for instance, is a common practice in Finland as well. A study circle is one of the most democratic forms of a learning environment that has been created. There are no teachers and the group decides on what content will be covered, scope will be used, as well as a delivery method.

Sometimes lifelong learning aims to provide educational opportunities outside standard educational systems—which can be cost-prohibitive, if available at all. On the other hand, formal administrative units devoted to this discipline exist in a number of universities. For example, the 'Academy of Lifelong Learning' is an administrative unit within the University-wide 'Professional and Continuing Studies' unit at the University of Delaware. Another example is the Jagiellonian University Extension (Wszechnica Uniwersytetu Jagiellonskiego), which is one of the most comprehensive Polish centers for lifelong learning (open learning, organizational learning, community learning).

In recent years, 'lifelong learning' has been adopted in the UK as an umbrella term for post-compulsory education that falls outside of the UK higher education system – further education, community education, work-based learning and similar voluntary, public sector and commercial settings.

Most colleges and universities in the United States encourage lifelong learning to non-traditional students. Professional licensure and certification courses are also offered at many universities, for instance for teachers, social services providers, and other professionals. Some colleges even enable adults to earn credit for the college-level learning gained through work, volunteer and other experiences.

Bangladesh Open University (BOU) has six schools and is offering 23 formal and 19 nonformal programs. The number of enrolled students in formal programs for 2016 was 433,413. Most of the courses of BOU are for professional development and most of the students are professional people who are getting scope to study in flexible hours. BOU is the only public institution in the country that imparts education in distance mode. In place of campus based teaching, this university uses technology including electronic devices to reach people in different corners of the country.

In Canada, the federal government's Lifelong Learning Plan allows Canadian residents to withdraw funds from their Registered Retirement Savings Plan to help pay for lifelong learning, but the funds can only be used for formal learning programs at designated educational institutions. 

Priorities for lifelong and life-wide learning have different priorities in different countries, some placing more emphasis on economic development (towards a learning economy) and some on social development (towards a learning society). For example, the policies of China, Republic of Korea, Singapore and Malaysia promote lifelong learning in a human resource development (HRD) perspective. The governments of these countries have done much to foster HRD whilst encouraging entrepreneurship.

Impact on long-term economic growth

Mainstream economic analysis has highlighted increased levels of primary and secondary education as a key driver of long-term economic growth. Data show that initial levels of educational attainment explain about half the difference in growth rates between East Asia and sub- Saharan Africa between 1965 and 2010. At the individual level, the knowledge and skills workers acquire through education and training make them more productive. Provision of good quality education can improve the knowledge and skills of a whole population beyond what traditional or informal systems can achieve. For business, educated and highly skilled workers foster productivity gains and technological change, through either innovation or imitation of processes developed elsewhere. At the societal level, education expansion helps build social and institutional capital, which has a strong impact on the investment climate and growth; it also helps in building social trust, developing participatory societies, strengthening the rule of law and supporting good governance.

Implications for an aging society

According to the Alzheimer's Society, it is estimated that more than a million Canadians will suffer from Alzheimer's diseases by 2030. "Exercising the brain may preserve it, forestalling mental decline" (Grady, 2012). In North America—and presumably globally—to proactively curb potential economic issues as the baby boomers continue to age, we need to look at society through a lifelong learning lens. Consider community programs to engage retirees and foster their cognitive health. Taking a proactive approach to keep our elderly population engaged through learning and their brains exercised as Grady described, the strain on the health care system and not to mention the families of the elderly would be lessened. The US Department of Health and Human Service published a study that suggests that older people with a mild cognitive impairment receive 8.5 hours more of care each week from their family and those with a severe impairment received 41.5 more hours than those without a cognitive impairment (USDHHS, 2007). Who pays for this? As a society we are living longer—85 years for men and 90 years for women—making cognitive health vitally important.

Distance education

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Distance_education

 

Distance education or long-distance learning is the education of students who may not always be physically present at a school. Traditionally, this usually involved correspondence courses wherein the student corresponded with the school via post. Today it involves online education. A distance learning program can be completely distance learning, or a combination of distance learning and traditional classroom instruction (called hybrid or blended). Massive open online courses (MOOCs), offering large-scale interactive participation and open access through the World Wide Web or other network technologies, are recent developments in distance education. A number of other terms (distributed learning, e-learning, online learning, virtual classroom etc.) are used roughly synonymously with distance education.

History

One of the earliest attempts was advertised in 1728. This was in the Boston Gazette for "Caleb Philipps, Teacher of the new method of Short Hand", who sought students who wanted to learn through weekly mailed lessons.

The first distance education course in the modern sense was provided by Sir Isaac Pitman in the 1840s, who taught a system of shorthand by mailing texts transcribed into shorthand on postcards and receiving transcriptions from his students in return for correction. The element of student feedback was a crucial innovation of Pitman's system. This scheme was made possible by the introduction of uniform postage rates across England in 1840.

This early beginning proved extremely successful, and the Phonographic Correspondence Society was founded three years later to establish these courses on a more formal basis. The Society paved the way for the later formation of Sir Isaac Pitman Colleges across the country.

The first correspondence school in the United States was the Society to Encourage Studies at Home, which was founded in 1873.

University correspondence courses

The University of London was the first university to offer distance learning degrees, establishing its External Programme in 1858. The background to this innovation lay in the fact that the institution (later known as University College London) was non-denominational and, given the intense religious rivalries at the time, there was an outcry against the "godless" university. The issue soon boiled down to which institutions had degree-granting powers and which institutions did not.

The London University in 1827, drawn by Thomas Hosmer Shepherd.

 

The compromise solution that emerged in 1836 was that the sole authority to conduct the examinations leading to degrees would be given to a new officially recognized entity called the "University of London", which would act as examining body for the University of London colleges, originally University College London and King's College London, and award their students University of London degrees. As Sheldon Rothblatt states: "Thus arose in nearly archetypal form the famous English distinction between teaching and examining, here embodied in separate institutions."

With the state giving examining powers to a separate entity, the groundwork was laid for the creation of a programme within the new university which would both administer examinations and award qualifications to students taking instruction at another institution or pursuing a course of self-directed study. 

Referred to as "People's University" by Charles Dickens because it provided access to higher education to students from less affluent backgrounds, the External Programme was chartered by Queen Victoria in 1858, making the University of London the first university to offer distance learning degrees to students. Enrollment increased steadily during the late 19th century, and its example was widely copied elsewhere. This program is now known as the University of London International Programme and includes Postgraduate, Undergraduate and Diploma degrees created by colleges such as the London School of Economics, Royal Holloway and Goldsmiths.

William Rainey Harper, encouraged the development of external university courses at the new University of Chicago in the 1890s.

 

In the United States, William Rainey Harper, first president of the University of Chicago, celebrated the concept of extended education, whereby the research university had satellite colleges in the wider community.

In 1892, Harper encouraged correspondence courses to further promote education, an idea that was put into practice by Chicago, Wisconsin, Columbia, and several dozen other universities by the 1920s Columbia University. Enrollment in the largest private for-profit school based in Scranton, Pennsylvania, the International Correspondence Schools grew explosively in the 1890s. Founded in 1888 to provide training for immigrant coal miners aiming to become state mine inspectors or foremen, it enrolled 2500 new students in 1894 and matriculated 72,000 new students in 1895. By 1906 total enrollments reached 900,000. The growth was due to sending out complete textbooks instead of single lessons, and the use of 1200 aggressive in-person salesmen. There was a stark contrast in pedagogy:

The regular technical school or college aims to educate a man broadly; our aim, on the contrary, is to educate him only along some particular line. The college demands that a student shall have certain educational qualifications to enter it and that all students study for approximately the same length of time; when they have finished their courses they are supposed to be qualified to enter any one of a number of branches in some particular profession. We, on the contrary, are aiming to make our courses fit the particular needs of the student who takes them.

Education was a high priority in the Progressive Era, as American high schools and colleges expanded greatly. For men who were older or were too busy with family responsibilities, night schools were opened, such as the YMCA school in Boston that became Northeastern University. Outside the big cities, private correspondence schools offered a flexible, narrowly focused solution. Large corporations systematized their training programs for new employees. The National Association of Corporation Schools grew from 37 in 1913 to 146 in 1920. Starting in the 1880s, private schools opened across the country which offered specialized technical training to anyone who enrolled, not just the employees of one company. Starting in Milwaukee in 1907, public schools began opening free vocational programs.

Only a third of the American population lived in cities of 100,000 or more population In 1920; to reach the rest, correspondence techniques had to be adopted. Australia, with its vast distances, was especially active; the University of Queensland established its Department of Correspondence Studies in 1911. In South Africa, the University of South Africa, formerly an examining and certification body, started to present distance education tuition in 1946. The International Conference for Correspondence Education held its first meeting in 1938. The goal was to provide individualized education for students, at low cost, by using a pedagogy of testing, recording, classification, and differentiation. The organization has since been renamed as the International Council for Open and Distance Education (ICDE), with headquarters in Oslo, Norway.

Open universities

Walton Hall, renovated in 1970 to act as the headquarters of the newly established Open University. (Artist: Hilary French)

 

The Open University in the United Kingdom was founded by the-then Labour government led by Prime Minister, Harold Wilson, based on the vision of Michael Young. Planning commenced in 1965 under the Minister of State for Education, Jennie Lee, who established a model for the Open University (OU) as one of widening access to the highest standards of scholarship in higher education, and set up a planning committee consisting of university vice-chancellors, educationalists and television broadcasters, chaired by Sir Peter Venables. The British Broadcasting Corporation (BBC) Assistant Director of Engineering at the time, James Redmond, had obtained most of his qualifications at night school, and his natural enthusiasm for the project did much to overcome the technical difficulties of using television to broadcast teaching programmes.

The Open University revolutionised the scope of the correspondence program and helped to create a respectable learning alternative to the traditional form of education. It has been at the forefront of developing new technologies to improve the distance learning service as well as undertaking research in other disciplines. Walter Perry was appointed the OU's first vice-chancellor in January 1969, and its foundation secretary was Anastasios Christodoulou. The election of the new Conservative government under the leadership of Edward Heath, in 1970; led to budget cuts under Chancellor of the Exchequer Iain Macleod (who had earlier called the idea of an Open University "blithering nonsense"). However, the OU accepted its first 25,000 students in 1971, adopting a radical open admissions policy. At the time, the total student population of conventional universities in the United Kingdom was around 130,000.

Athabasca University, Canada's Open University, was created in 1970 and followed a similar, though independently developed, pattern. The Open University inspired the creation of Spain's National University of Distance Education (1972) and Germany's FernUniversität in Hagen (1974). There are now many similar institutions around the world, often with the name "Open University" (in English or in the local language).

Most open universities use distance education technologies as delivery methods, though some require attendance at local study centres or at regional "summer schools". Some open universities have grown to become mega-universities, a term coined to denote institutions with more than 100,000 students.

Technologies

Internet technology has enabled many forms of distance learning through open educational resources and facilities such as e-learning and MOOCs. Although the expansion of the Internet blurs the boundaries, distance education technologies are divided into two modes of delivery: synchronous learning and asynchronous learning.

In synchronous learning, all participants are "present" at the same time. In this regard, it resembles traditional classroom teaching methods despite the participants being located remotely. It requires a timetable to be organized. Web conferencing, videoconferencing, educational television, instructional television are examples of synchronous technology, as are direct-broadcast satellite (DBS), internet radio, live streaming, telephone, and web-based VoIP. Web conferencing software helps to facilitate meetings in distance learning courses and usually contain additional interaction tools such as text chat, polls, hand raising, emoticons etc. These tools also support asynchronous participation by students being able to listen to recordings of synchronous sessions. Immersive environments (notably SecondLife) have also been used to enhance participant presence in distance education courses. Another form of synchronous learning that has been entering the classroom over the last couple of years is the use of robot proxies including those that allow sick students to attend classes.

Some universities have been starting to use robot proxies to enable more engaging synchronous hybrid classes where both remote and in person students can be present and interact using telerobotics devices such as the Kubi Telepresence robot stand that looks around and the Double Robot that roams around. With these telepresence robots, the remote students have a seat at the table or desk instead of being on a screen on the wall.

In asynchronous learning, participants access course materials flexibly on their own schedules. Students are not required to be together at the same time. Mail correspondence, which is the oldest form of distance education, is an asynchronous delivery technology, as are message board forums, e-mail, video and audio recordings, print materials, voicemail, and fax.

The two methods can be combined. Many courses offered by both open universities and an increasing number of campus based institutions use periodic sessions of residential or day teaching to supplement the sessions delivered at a distance. This type of mixed distance and campus based education has recently come to be called "blended learning" or less often "hybrid learning". Many open universities uses a blend of technologies and a blend of learning modalities (face-to-face, distance, and hybrid) all under the rubric of "distance learning". 

Distance learning can also use interactive radio instruction (IRI), interactive audio instruction (IAI), online virtual worlds, digital games, webinars, and webcasts, all of which are referred to as e-Learning.

Radio and television

The rapid spread of film in the 1920s and radio in the 1930s led to proposals to use it for distance education. By 1938, at least 200 city school systems, 25 state boards of education, and many colleges and universities broadcast educational programs for the public schools. One line of thought was to use radio as a master teacher.

Experts in given fields broadcast lessons for pupils within the many schoolrooms of the public school system, asking questions, suggesting readings, making assignments, and conducting tests. This mechanizes education and leaves the local teacher only the tasks of preparing for the broadcast and keeping order in the classroom.

A typical setup came in Kentucky in 1948 when John Wilkinson Taylor, president of the University of Louisville, teamed up with NBC to use radio as a medium for distance education, The chairman of the Federal Communications Commission endorsed the project and predicted that the "college-by-radio" would put "American education 25 years ahead". The University was owned by the city, and local residents would pay the low tuition rates, receive their study materials in the mail, and listen by radio to live classroom discussions that were held on campus. Physicist Daniel Q. Posin also was a pioneer in the field of distance education when he hosted a televised course through DePaul University.

Charles Wedemeyer of the University of Wisconsin–Madison also promoted new methods. From 1964 to 1968, the Carnegie Foundation funded Wedemeyer's Articulated Instructional Media Project (AIM) which brought in a variety of communications technologies aimed at providing learning to an off-campus population. The radio courses faded away in the 1950s. Many efforts to use television along the same lines proved unsuccessful, despite heavy funding by the Ford Foundation.

From 1970 to 1972 the Coordinating Commission for Higher Education in California funded Project Outreach to study the potential of telecourses. The study included the University of California, California State University and the community colleges. This study led to coordinated instructional systems legislation allowing the use of public funds for non-classroom instruction and paved the way for the emergence of telecourses as the precursor to the online courses and programs of today. The Coastline Community Colleges, The Dallas County Community College District, and Miami Dade Community College led the way. The Adult Learning Service of the US Public Broadcasting Service came into being and the “wrapped” series, and individually produced telecourse for credit became a significant part of the history of distance education and online learning.

Internet

The widespread use of computers and the internet have made distance learning easier and faster, and today virtual schools and virtual universities deliver full curricula online. The capacity of Internet to support voice, video, text and immersion teaching methods made earlier distinct forms of telephone, videoconferencing, radio, television, and text based education somewhat redundant. However, many of the techniques developed and lessons learned with earlier media are used in Internet delivery.

The first completely online course for credit was offered by the University of Toronto in 1984 through the Graduate School of Education (then called OISE: the Ontario Institute for Studies in Education). The topic was “Women and Computers in Education”, dealing with gender issues and educational computing. The first new and fully online university was founded in 1994 as the Open University of Catalonia, headquartered in Barcelona, Spain. In 1999 Jones International University was launched as the first fully online university accredited by a regional accrediting association in the US.

Between 2000 and 2008, enrollment in distance education courses increased rapidly in almost every country in both developed and developing countries. Many private, public, non-profit and for-profit institutions worldwide now offer distance education courses from the most basic instruction through to the highest levels of degree and doctoral programs. New York University, International University Canada, for example, offers online degrees in engineering and management-related fields through NYU Tandon Online. Levels of accreditation vary: widely respected universities such as Stanford University and Harvard now deliver online courses—but other online schools receive little outside oversight, and some are actually fraudulent, i.e., diploma mills. In the US, the Distance Education Accrediting Commission (DEAC) specializes in the accreditation of distance education institutions.

In the United States in 2011, it was found that a third of all the students enrolled in postsecondary education had taken an accredited online course in a postsecondary institution. Even though growth rates are slowing, enrollment for online courses has been seen to increase with the advance in technology. The majority of public and private colleges now offer full academic programs online. These include, but are not limited to, training programs in the mental health, occupational therapy, family therapy, art therapy, physical therapy, and rehabilitation counseling fields. 

Distance education has a long history, but its popularity and use has grown exponentially as more advanced technology has become available. By 2008, online learning programs were available in the United States in 44 states at the K-12 level.

Internet forums, online discussion group and online learning community can contribute to an efficacious distance education experience. Research shows that socialization plays an important role in some forms of distance education.

E-courses are also a viable option for distance learning. There are many available that cover a broad range of topics.

Paced and self-paced models

Distance education can be delivered in a paced format similar to traditional campus based models in which learners commence and complete a course at the same time. Paced delivery is currently the most common mode of distance education delivery. Alternatively, some institutions offer self-paced programs that allow for continuous enrollment and the length of time to complete the course is set by the learner's time, skill and commitment levels. Paced courses may be offered in either synchronous mode, but self-paced courses are almost always offered asynchronously. Each delivery model offers both advantages and disadvantages for students, teachers and institutions.

Kaplan and Haenlein classify distance education into four groups along the dimensions Time dependency and Number of participants: 1) MOOCs (Massive Open Online Courses): Open-access online course (i.e., without specific participation restrictions) that allows for unlimited (massive) participation; 2) SPOCs (Small Private Online Courses): Online course that only offers a limited number of places and therefore requires some form of formal enrollment; 3) SMOCs (Synchronous Massive Online Courses): Open-access online course that allows for unlimited participation but requires students to be "present" at the same time (synchronously); 4) SSOCs (Synchronous Private Online Courses): Online course that only offers a limited number of places and requires students to be "present" at the same time (synchronously).

Paced models are a familiar mode as they are used almost exclusively in campus based schools. Institutes that offer both distance and campus programs usually use paced models as teacher workload, student semester planning, tuition deadlines, exam schedules and other administrative details can be synchronized with campus delivery. Student familiarity and the pressure of deadlines encourages students to readily adapt to and usually succeed in paced models. However, student freedom is sacrificed as a common pace is often too fast for some students and too slow for others. In addition life events, professional or family responsibilities can interfere with a students capability to complete tasks to an external schedule. Finally, paced models allows students to readily form communities of inquiry and to engage in collaborative work. 

Self-paced courses maximize student freedom, as not only can students commence studies on any date, but they can complete a course in as little time as a few weeks or up to a year or longer. Students often enroll in self-paced study when they are under pressure to complete programs, have not been able to complete a scheduled course, need additional courses or have pressure which precludes regular study for any length of time. The self-paced nature of the programming, though is an unfamiliar model for many students and can lead to excessive procrastination resulting in course incompletion. Assessment of learning can also be challenging as exams can be written on any day, making it possible for students to share examination questions with resulting loss of academic integrity. Finally, it is extremely challenging to organize collaborative work activities, though some schools are developing cooperative models based upon networked and connectivist pedagogies, for use in self-paced programs. 

Benefits

Distance learning can expand access to education and training for both general populace and businesses since its flexible scheduling structure lessens the effects of the many time-constraints imposed by personal responsibilities and commitments. Devolving some activities off-site alleviates institutional capacity constraints arising from the traditional demand on institutional buildings and infrastructure. Furthermore, there is the potential for increased access to more experts in the field and to other students from diverse geographical, social, cultural, economic, and experiential backgrounds. As the population at large becomes more involved in lifelong learning beyond the normal schooling age, institutions can benefit financially, and adult learning business courses may be particularly lucrative. Distance education programs can act as a catalyst for institutional innovation and are at least as effective as face-to-face learning programs, especially if the instructor is knowledgeable and skilled.

Distance education can also provide a broader method of communication within the realm of education. With the many tools and programs that technological advancements have to offer, communication appears to increase in distance education amongst students and their professors, as well as students and their classmates. The distance educational increase in communication, particularly communication amongst students and their classmates, is an improvement that has been made to provide distance education students with as many of the opportunities as possible as they would receive in in-person education. The improvement being made in distance education is growing in tandem with the constant technological advancements. Present-day online communication allows students to associate with accredited schools and programs throughout the world that are out of reach for in-person learning. By having the opportunity to be involved in global institutions via distance education, a diverse array of thought is presented to students through communication with their classmates. This is beneficial because students have the opportunity to "combine new opinions with their own, and develop a solid foundation for learning". It has been shown through research that "as learners become aware of the variations in interpretation and construction of meaning among a range of people [they] construct an individual meaning", which can help students become knowledgeable of a wide array of viewpoints in education. To increase the likelihood that students will build effective ties with one another during the course, instructors should use similar assignments for students across different locations to overcome the influence of co-location on relationship building.

The high cost of education affects students in higher education, to which distance education may be an alternative in order to provide some relief. Distance education has been a more cost-effective form of learning, and can sometimes save students a significant amount of money as opposed to traditional education. Distance education may be able to help to save students a considerable amount financially by removing the cost of transportation. In addition, distance education may be able to save students from the economic burden of high-priced course textbooks. Many textbooks are now available as electronic textbooks, known as e-textbooks, which can offer digital textbooks for a reduced price in comparison to traditional textbooks. Also, the increasing improvements in technology have resulted in many school libraries having a partnership with digital publishers that offer course materials for free, which can help students significantly with educational costs.

Within the class, students are able to learn in ways that traditional classrooms would not be able to provide. It is able to promote good learning experiences and therefore, allow students to obtain higher satisfaction with their online learning. For example, students can review their lessons more than once according to their need. Students can then manipulate the coursework to fit their learning by focusing more on their weaker topics while breezing through concepts that they already have or can easily grasp. When course design and the learning environment are at their optimal conditions, distance education can lead students to higher satisfaction with their learning experiences. Studies have shown that high satisfaction correlates to increased learning. For those in a healthcare or mental health distance learning program, online-based interactions have the potential to foster deeper reflections and discussions of client issues as well as a quicker response to client issues, since supervision happens on a regular basis and is not limited to a weekly supervision meeting. This also may contribute to the students feeling a greater sense of support, since they have ongoing and regular access to their instructors and other students.

Distance learning may enable students who are unable to attend a traditional school setting, due to disability or illness such as decreased mobility and immune system suppression, to get a good education. Children who are sick or are unable to attend classes are able to attend them in "person" through the use of robot proxies. This helps the students have experiences of the classroom and social interaction that they are unable to receive at home or the hospital, while still keeping them in a safe learning environment. Over the last few years more students are entering safely back into the classroom thanks to the help of robots. An article from the New York Times, "A Swiveling Proxy Will Even Wear a Tutu", explains the positive impact of virtual learning in the classroom, and another that explains how even a simple, stationary telepresence robot can help. Distance education may provide equal access regardless of socioeconomic status or income, area of residence, gender, race, age, or cost per student. Applying universal design strategies to distance learning courses as they are being developed (rather than instituting accommodations for specific students on an as-needed basis) can increase the accessibility of such courses to students with a range of abilities, disabilities, learning styles, and native languages. Distance education graduates, who would never have been associated with the school under a traditional system, may donate money to the school.

Distance learning may also offer a final opportunity for adolescents that are no longer permitted in the general education population due to behavior disorders. Instead of these students having no other academic opportunities, they may continue their education from their homes and earn their diplomas, offering them another chance to be an integral part of society.

Distance learning offers individuals a unique opportunity to benefit from the expertise and resources of the best universities currently available. Students have the ability to collaborate, share, question, infer, and suggest new methods and techniques for continuous improvement of the content. The ability to complete a course at a pace that is appropriate for each individual is the most effective manner to learn given the personal demands on time and schedule. Self-paced distance learning on a mobile device, such is a smartphone, provides maximum flexibility and capability. 

Criticism

Barriers to effective distance education include obstacles such as domestic distractions and unreliable technology, as well as students' program costs, adequate contact with teachers and support services, and a need for more experience.

Some students attempt to participate in distance education without proper training with the tools needed to be successful in the program. Students must be provided with training opportunities (if needed) on each tool that is used throughout the program. The lack of advanced technology skills can lead to an unsuccessful experience. Schools have a responsibility to adopt a proactive policy for managing technology barriers. Time management skills and self-discipline in distance education is just as important as complete knowledge of the software and tools being used for learning.

The results of a study of Washington state community college students showed that distance learning students tended to drop out more often than their traditional counterparts due to difficulties in language, time management, and study skills.

According to Dr. Pankaj Singhm, director of Nims University, "distance learning benefits may outweigh the disadvantages for students in such a technology-driven society; however before indulging into use of educational technology a few more disadvantages should be considered." He describes that over multiple years, "all of the obstacles have been overcome and the world environment for distance education continues to improve." Dr. Pankaj Singhm also claims there is a debate to distance education stating, "due to a lack of direct face-to-face social interaction. However, as more people become used to personal and social interaction online (for example dating, chat rooms, shopping, or blogging), it is becoming easier for learners to both project themselves and socialize with others. This is an obstacle that has dissipated."

Not all courses required to complete a degree may be offered online. Health care profession programs in particular, require some sort of patient interaction through field work before a student may graduate. Studies have also shown that students pursuing a medical professional graduate degree who are participating in distance education courses, favor face to face communication over professor-mediated chat rooms and/or independent studies. However, this is little correlation between student performance when comparing the previous different distance learning strategies.

There is a theoretical problem about the application of traditional teaching methods to online courses because online courses may have no upper size limit. Daniel Barwick noted that there is no evidence that large class size is always worse or that small class size is always better, although a negative link has been established between certain types of instruction in large classes and learning outcomes; he argued that higher education has not made a sufficient effort to experiment with a variety of instructional methods to determine whether large class size is always negatively correlated with a reduction in learning outcomes. Early proponents of Massive Open Online Courses (MOOC)s saw them as just the type of experiment that Barwick had pointed out was lacking in higher education, although Barwick himself has never advocated for MOOCs.

There may also be institutional challenges. Distance learning is new enough that it may be a challenge to gain support for these programs in a traditional brick-and-mortar academic learning environment. Furthermore, it may be more difficult for the instructor to organize and plan a distance learning program, especially since many are new programs and their organizational needs are different from a traditional learning program. 

Additionally, though distance education offers industrial countries the opportunity to become globally informed, there are still negative sides to it. Hellman states that "These include its cost and capital intensiveness, time constraints and other pressures on instructors, the isolation of students from instructors and their peers, instructors’ enormous difficulty in adequately evaluating students they never meet face-to-face, and drop-out rates far higher than in classroom-based courses."

A more complex challenge of distance education relates to cultural differences between student and teachers and among students. Distance programmes tend to be more diverse as they could go beyond the geographical borders of regions, countries, and continents, and cross the cultural borders that may exist with respect to race, gender, and religion. That requires a proper understanding and awareness of the norms, differences, preconceptions and potential conflicting issues.

Educational technology

The modern use of electronic educational technology (also called e-learning) facilitates distance learning and independent learning by the extensive use of information and communications technology (ICT), replacing traditional content delivery by postal correspondence. Instruction can be synchronous and asynchronous online communication in an interactive learning environment or virtual communities, in lieu of a physical classroom. "The focus is shifted to the education transaction in the form of virtual community of learners sustainable across time."

One of the most significant issues encountered in the mainstream correspondence model of distance education is transactional distance, which results from the lack of appropriate communication between learner and teacher. This gap has been observed to become wider if there is no communication between the learner and teacher and has direct implications over the learning process and future endeavors in distance education. Distance education providers began to introduce various strategies, techniques, and procedures to increase the amount of interaction between learner and teacher. These measures e.g. more frequent face-to-face tutorials, increased use of information and communication technologies including teleconferencing and the Internet, were designed to close the gap in transactional distance.

Credentials

Online credentials for learning are digital credentials that are offered in place of traditional paper credentials for a skill or educational achievement. Directly linked to the accelerated development of internet communication technologies, the development of digital badges, electronic passports and massive open online courses (MOOCs) have a very direct bearing on our understanding of learning, recognition and levels as they pose a direct challenge to the status quo. It is useful to distinguish between three forms of online credentials: Test-based credentials, online badges, and online certificates.

N-body simulation

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/N-body_simulation

 

An N-body simulation of the cosmological formation of a cluster of galaxies in an expanding universe.

 

In physics and astronomy, an N-body simulation is a simulation of a dynamical system of particles, usually under the influence of physical forces, such as gravity (see n-body problem). N-body simulations are widely used tools in astrophysics, from investigating the dynamics of few-body systems like the Earth-Moon-Sun system to understanding the evolution of the large-scale structure of the universe. In physical cosmology, N-body simulations are used to study processes of non-linear structure formation such as galaxy filaments and galaxy halos from the influence of dark matter. Direct N-body simulations are used to study the dynamical evolution of star clusters. 

Nature of the particles

The 'particles' treated by the simulation may or may not correspond to physical objects which are particulate in nature. For example, an N-body simulation of a star cluster might have a particle per star, so each particle has some physical significance. On the other hand, a simulation of a gas cloud cannot afford to have a particle for each atom or molecule of gas as this would require on the order of 10²³ particles for each mole of material (see Avogadro constant), so a single 'particle' would represent some much larger quantity of gas (often implemented using Smoothed Particle Hydrodynamics). This quantity need not have any physical significance, but must be chosen as a compromise between accuracy and manageable computer requirements. 

Direct gravitational N-body simulations

In direct gravitational N-body simulations, the equations of motion of a system of N particles under the influence of their mutual gravitational forces are integrated numerically without any simplifying approximations. These calculations are used in situations where interactions between individual objects, such as stars or planets, are important to the evolution of the system. 

The first direct N-body simulations were carried out by Erik Holmberg at the Lund Observatory in 1941, determining the forces between stars in encountering galaxies via the mathematical equivalence between light propagation and gravitational interaction: putting light bulbs at the positions of the stars and measuring the directional light fluxes at the positions of the stars by a photo cell, the equations of motion can be integrated with ${\displaystyle O(N)}$ effort. The first purely calculational simulations were then done by Sebastian von Hoerner at the Astronomisches Rechen-Institut in Heidelberg, Germany. Sverre Aarseth at the University of Cambridge (UK) has dedicated his entire scientific life to the development of a series of highly efficient N-body codes for astrophysical applications which use adaptive (hierarchical) time steps, an Ahmad-Cohen neighbour scheme and regularization of close encounters. Regularization is a mathematical trick to remove the singularity in the Newtonian law of gravitation for two particles which approach each other arbitrarily close. Sverre Aarseth's codes are used to study the dynamics of star clusters, planetary systems and galactic nuclei.

General relativity simulations

Many simulations are large enough that the effects of general relativity in establishing a Friedmann-Lemaitre-Robertson-Walker cosmology are significant. This is incorporated in the simulation as an evolving measure of distance (or scale factor) in a comoving coordinate system, which causes the particles to slow in comoving coordinates (as well as due to the redshifting of their physical energy). However, the contributions of general relativity and the finite speed of gravity can otherwise be ignored, as typical dynamical timescales are long compared to the light crossing time for the simulation, and the space-time curvature induced by the particles and the particle velocities are small. The boundary conditions of these cosmological simulations are usually periodic (or toroidal), so that one edge of the simulation volume matches up with the opposite edge.

Calculation optimizations

N-body simulations are simple in principle, because they involve merely integrating the 6N ordinary differential equations defining the particle motions in Newtonian gravity. In practice, the number N of particles involved is usually very large (typical simulations include many millions, the Millennium simulation included ten billion) and the number of particle-particle interactions needing to be computed increases on the order of N², and so direct integration of the differential equations can be prohibitively computationally expensive. Therefore, a number of refinements are commonly used. 

Numerical integration is usually performed over small timesteps using a method such as leapfrog integration. However all numerical integration leads to errors. Smaller steps give lower errors but run more slowly. Leapfrog integration is roughly 2nd order on the timestep, other integrators such as Runge–Kutta methods can have 4th order accuracy or much higher. 

One of the simplest refinements is that each particle carries with it its own timestep variable, so that particles with widely different dynamical times don't all have to be evolved forward at the rate of that with the shortest time. 

There are two basic approximation schemes to decrease the computational time for such simulations. These can reduce the computational complexity to O(N log N) or better, at the loss of accuracy. 

Tree methods

In tree methods, such as a Barnes–Hut simulation, an octree is usually used to divide the volume into cubic cells and only interactions between particles from nearby cells need to be treated individually; particles in distant cells can be treated collectively as a single large particle centered at the distant cell's center of mass (or as a low-order multipole expansion). This can dramatically reduce the number of particle pair interactions that must be computed. To prevent the simulation from becoming swamped by computing particle-particle interactions, the cells must be refined to smaller cells in denser parts of the simulation which contain many particles per cell. For simulations where particles are not evenly distributed, the well-separated pair decomposition methods of Callahan and Kosaraju yield optimal O(n log n) time per iteration with fixed dimension. 

Particle mesh method

Another possibility is the particle mesh method in which space is discretised on a mesh and, for the purposes of computing the gravitational potential, particles are assumed to be divided between the nearby vertices of the mesh. Finding the potential energy Φ is easy, because the Poisson equation

${\displaystyle \nabla ^{2}\Phi =4\pi G{\rho },\,}$

where G is Newton's constant and ${\displaystyle {\rho }}$ is the density (number of particles at the mesh points), is trivial to solve by using the fast Fourier transform to go to the frequency domain where the Poisson equation has the simple form

${\displaystyle {\hat {\Phi }}=-4\pi G{\frac {\hat {\rho }}{k^{2}}},\,}$

where ${\displaystyle {\vec {k}}}$ is the comoving wavenumber and the hats denote Fourier transforms. The gravitational field can now be found by multiplying by ${\displaystyle {\vec {k}}}$ and computing the inverse Fourier transform (or computing the inverse transform and then using some other method). Since this method is limited by the mesh size, in practice a smaller mesh or some other technique (such as combining with a tree or simple particle-particle algorithm) is used to compute the small-scale forces. Sometimes an adaptive mesh is used, in which the mesh cells are much smaller in the denser regions of the simulation. 

Special-case optimizations

Several different gravitational perturbation algorithms are used to get fairly accurate estimates of the path of objects in the solar system.

People often decide to put a satellite in a frozen orbit. The path of a satellite closely orbiting the Earth can be accurately modeled starting from the 2-body elliptical orbit around the center of the Earth, and adding small corrections due to the oblateness of the Earth, gravitational attraction of the Sun and Moon, atmospheric drag, etc. It is possible to find a frozen orbit without calculating the actual path of the satellite.

The path of a small planet, comet, or long-range spacecraft can often be accurately modeled starting from the 2-body elliptical orbit around the sun, and adding small corrections from the gravitational attraction of the larger planets in their known orbits.

Some characteristics of the long-term paths of a system of particles can be calculated directly. The actual path of any particular particle does not need to be calculated as an intermediate step. Such characteristics include Lyapunov stability, Lyapunov time, various measurements from ergodic theory, etc. 

Two-particle systems

Although there are millions or billions of particles in typical simulations, they typically correspond to a real particle with a very large mass, typically 10⁹ solar masses. This can introduce problems with short-range interactions between the particles such as the formation of two-particle binary systems. As the particles are meant to represent large numbers of dark matter particles or groups of stars, these binaries are unphysical. To prevent this, a softened Newtonian force law is used, which does not diverge as the inverse-square radius at short distances. Most simulations implement this quite naturally by running the simulations on cells of finite size. It is important to implement the discretization procedure in such a way that particles always exert a vanishing force on themselves.

Incorporating baryons, leptons and photons into simulations

Many simulations simulate only cold dark matter, and thus include only the gravitational force. Incorporating baryons, leptons and photons into the simulations dramatically increases their complexity and often radical simplifications of the underlying physics must be made. However, this is an extremely important area and many modern simulations are now trying to understand processes that occur during galaxy formation which could account for galaxy bias. 

Computational complexity

Reif et al. prove that if the n-body reachability problem is defined as follows – given n bodies satisfying a fixed electrostatic potential law, determining if a body reaches a destination ball in a given time bound where we require a poly(n) bits of accuracy and the target time is poly(n) is in PSPACE. 

On the other hand, if the question is whether the body eventually reaches the destination ball, the problem is PSPACE-hard. These bounds are based on similar complexity bounds obtained for ray tracing.