• 제어로봇시스템학회논문지
• /
• 제22권6호
• /
• pp.435-444
• /
• 2016

James C. Maxwell published a paper titled "On Governors" in the Proceedings of the Royal Society of London in 1868. However, this paper was ignored for about 80 years due to unreadability of the paper itself. In 1948, Norbert Wiener revived this paper and identified it as the first significant control theory paper, which gave Maxwell his due as the first contributor to this theory. The purpose of this article is to provide historical information on the origin of stability analysis through Maxwell's paper, and to revisit the key idea of the paper in view of the present stability theory with clear explanations. This article includes a proof and some illustrative figures of governors that were not shown in the original publication.

• 대한견주관절학회:학술대회논문집
• /
• 대한견주관절학회 2006년도 제14차 학술대회
• /
• pp.36-36
• /
• 2006

• 한국실천공학교육학회논문지
• /
• 제2권2호
• /
• pp.55-60
• /
• 2010

평상시 전자기 현상들을 접하고 있는 우리들은 이러한 현상들의 단편적인 면은 느낄 수 있으나 시각적으로 파악하기 어려운 현상이며 더욱이 물리 및 정량적으로 이해하기란 쉬운 일이 아니다. 이들 정전기장, 정자기장 또한 전자장이 결합되어있는 교류자장은 실험식과 이론적으로 James Clerk Maxwell에 의해 1873년도에 완성되었다. 따라서 전자장은 Maxwell방정식에 근거를 둔 수식의 전개로 전기 자기 현상을 다룬다. 이러한 수식전개가 바탕이 되는 학문이기에 처음으로 전자기를 배우는 중 고등학교 학생, 대학 기본과목인 대학 물리를 배우는 대학생, 이와 관련된 전공 학생에게 조차 이해하기에 어려움이 따른다. 따라서 이러한 난점들을 해결하고자 전자기 제반현상들을 시각적으로 파악하고 더 나아가 수식적으로 해를 구하기 어려운 문제들을 수치해석방법을 이용해 해의 거동을 추정할 수 있도록 하는 학부 수준의 가상 교육용 전자장 프로그램을 개발하고자 하였다.

• 영어영문학
• /
• 제57권6호
• /
• pp.939-958
• /
• 2011

Ezra Pound has an idea of poetry as a field of energy in which words interact with each other with kinetic energy. The energy field which Pound creates in his poem is analogous to the theory of electromagnetism developed by Michael Faraday and James Maxwell, who look upon the space around magnets, electric charges and currents not as empty but as filled with energy and activity. Pound argues that "words are charged with force like electricity," demonstrating that words charged with their own images or energies of positive or negative valence interact one another. This idea is similar to Faraday's concept of "line of force" which he used to represent the disposition of electric and magnetic forces in space. Pound's concept of "image" as an "intellectual and emotional complex in an instant" is remarkably consonant with the confluence of electric and magnetic fields that are coupled to each other as they travel through space in the form of electromagnetic waves. The instant profusion of conception and perception, much like that of electric and magnetic fields, enables Pound to move beyond the sequential and linear hierarchy in time and space. Particularly, Maxwell's stunning discovery that the electromagnetic waves propagate in space at 'the speed of light' has allowed Pound a relativistic sense of escape from the limitations of Newtonian absolute time and space. Pound's poetry transcends any geographical space and sequential time by rendering and juxtaposing images simultaneously. Pound was fully aware of light and electricity fundamental to what he called his world "the electric world." Pound's experiments in Imagism and Vorticism can be considered an attempt to rediscover a place for poetry in the modern world of science and technology. Almost all the appliances that we think of today as modern were laid down in the closing decades of the 19th century and the first decades of the 20th century, in response to the availability of electromagnetic energy. This paper explores how Pound responded to the age of modern technology and science, examining his conception of "image" through his many analogies and similes drawn from electromagnetism. Pound's imagist poetics and poetry come to embody, not only the characteristics of the electric age in the early twentieth century, but the principles of electromagnetism the electric age is based upon.

• 대한수학회지
• /
• 제40권4호
• /
• pp.577-593
• /
• 2003

The Funk transform is defined by integrating a function on the two-sphere over its great circles. We use complex analysis to invert this transform.

• 천문학회보
• /
• 제40권2호
• /
• pp.27.3-27.3
• /
• 2015

The East Asian Observatory (EAO) was established in 2014 by the East Asian Core Observatories Association (EACOA). The goal of the EAO is to build and operate world-class facilities on behalf of the East Asian regions, as a counterpart to the European Southern Observatory (ESO). Leading astronomical facilities such as ALMA, TMT, GMT, and SKA are mega projects which require enormous economic resources. It is difficult for any observatory or any country to fund such facilities on its own. EAO intends to combine the resources and manpower in our East Asian regions, in order to play a leading role in the next generation frontier instruments. The EACOA institutes: NAOC, NAOJ, KASI, and ASIAA, have authorized the EAO to take on the operations of the James Clerk Maxwell Telescope (JCMT) on Mauna Kea as their first joint venture. In this talk, we will report on the development of EAO, our current operations of JCMT, and our future aspirations.

• 천문학회보
• /
• 제39권2호
• /
• pp.116.1-116.1
• /
• 2014

Korea officially joined the ALMA (Atacama Large Millimeter/submillimeter Array) project on August 17, 2014. Korea was allowed to apply for the Cycle 2 call-for-proposal before joining the project. Korea submitted 17 proposals, and 4 of them were selected as high-priority. The fund of an 11-year Korean ALMA project in the KASI (Korea Astronomy and Space Science Institute) was approved. The project team formulated an ARC (ALMA Regional Center) node at the KASI and already started its supporting activities for the Korean Astronomical Society. The team also set up a future development plan for ASTE (Atacama Submillimeter Telescope Experiment) and ALMA. A couple of engineers are now doing concept design of a multi-beam receiver system for the ASTE, Because of the ALMA participation, Korea could also access open-use time of ASTE and Mopra telescopes organized by Japan. As of this writing, EACOA (East Asia Core Observatories Association) is now under discussion on making an organization called "East Asian Observatory" and the possible operation of JCMT (James Clerk Maxwell Telescope). I will briefly mention the future prospect of these activities.

• 천문학회보
• /
• 제41권2호
• /
• pp.47.2-47.2
• /
• 2016

We introduce a magnetic field survey of the Gould Belt clouds using the James Clerk Maxwell Telescope (JCMT) POL-2: B-fields In STar-forming Region Observations (BISTRO). POL-2 with SCUBA-2 on JCMT is a unique facility, as it is the only facility world-wide that can map the magnetic field within cold dense cores and filaments on scales of ~1000 AU in nearby star-forming regions, such as Taurus and Ophiuchus. It can provide a link between the B-field measured on arc-minute scales by Planck and BLASTPOL and measurements made on arc-second scales by interferometers such as CARMA, SMA, and ALMA. BISTRO was awarded 224 hours toward 16 fields for the next 3 years and started to take data in the 2016A semester.

• 천문학회보
• /
• 제42권2호
• /
• pp.58.2-58.2
• /
• 2017

The special session of the East Asian Observatory was prepared to let the Korean Astronomical Community know the current status and future prospect of the EAO, and to hear the opinion from the community. The East Asian Observatory (EAO) was formulated on September 5, 2014 by East Asian Core Observatories Associations (EACOA) as a non-profit company registered in the State of Hawaii. As a first mission of the EAO, it has successfully operated the James Clerk Maxwell Telescope (JCMT) since March 2015. The Submillimeter Array (SMA) has been available to the East Asian astronomers from 2017A season through the EAO, and the Subaru and the East Asian VLBI Network (EAVN) are the possible facilities to be available in near future.

• 천문학회보
• /
• 제42권2호
• /
• pp.79.1-79.1
• /
• 2017

The B-fields In STar-forming Region Observations (BISTRO) is the 3-year large program of the James Clerk Maxwell Telescope (JCMT) using SCUBA-2 and POL-2, started in 2016. We aim to study the roles of magnetic fields in star formation by observing 16 fields of nearby star forming regions, e.g., Orion and Ophiuchus molecular clouds. The angular resolution and wavelength provided by JCMT (14 arcsecond at 850 micrometer) is ideal to investigate the intermediate scales of magnetic fields (1000-10000 au) associated in cold dense cores and filaments. This year, moreover, we were awarded JCMT time for additional 16 fields (BISTRO-2), which allows us to cover broader physical properties of star forming regions. We report the current status of BISTRO and introduce BISTRO-2.