• Journal of Chest Surgery
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• v.29 no.2
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• pp.129-135
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• 1996

In general, common people have more understanding of and confidence in the university hospital than the private and the smaller semi-general hospital. But they know little about an appropriate field that is a part of the university hospital And takes care of them. Taking these situations into consideration, we, writers made analyses of statistics by putting into the form of diagrams. Stati tics are about these questions. 1. How much Korean adults know about nly major, a special treatment field-Thoracic & Cardiovascular surgery (T.C.S). 2. How much Korean adults know about the detailed parts of the T.C.S. 3. How much korean adults know about how medical treatment and operations are performed, and which diseases are concerned with the T.C.S. At this point, to compare the medical team's practical province in the T.C.S. surgery with the contents of 'common people's knowledge of the T.C.S., we made a balanced-check of many situations according to questions about the T.C.S. We present common people's actual answers.

• The Bulletin of The Korean Astronomical Society
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• v.36 no.2
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• pp.102.1-102.1
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• 2011

In this study we use three-dimensional magnetohydrodynamic simulations to investigate how the dynamic state of emerging magnetic field is related to the twist of field lines. Emerging magnetic field forms a magnetic structure on the Sun where various kinds of activity such as solar flares, jets, and coronal mass ejections are observed. To understand the physical mechanism for producing such activity, we have to know the dynamic nature of this structure. Since flares are the manifestation of rapidly dissipating electric current in the corona, we also investigate the distribution of current density inside the structure and examine how it depends on the field-line twist. To demonstrate the dynamic structure of emerging magnetic field, we focus on the factors characterizing the geometric property and stratification of emerging magnetic field, such as the curvature of field line and the scale height of field strength. These two factors show that emerging field forms a two-part structure in which the central part is close to a force-free state while the outer marginal part is in a fairly dynamic state where magnetic pressure force is dominant. We discuss how the field-line twist affects the two-part structure and also explain a possible relation between electric current structure and sigmoid observed in a preflare phase.

• Journal of the Korean Professional Engineers Association
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• v.36 no.6
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• pp.28-35
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• 2003

The present world economic powers are divided into three major economic blocks such as EU, NAFTA and North - east Asian Region. In N-E Asian Region, Beijing. Seoul, Tokyo and Shanghai are already bridged economically forming transaction belt with the population of seven hundred million people around the belt. The countries as China, Mongol far - east Russia are rich in natural resources. on the other hand Korea and Japan are superior in technological know-how than that of communist and socialist countries. If we try to be eager to join together with the resource rich countries to the countries of technological know - how as Korea and Japan. The North - east Asian region will be jumping up to the most prosperous and super economic power in the coming years in 2040-2050.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.1
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• pp.87.1-87.1
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• 2012

We use three-dimensional magnetohydrodynamic simulations to investigate how the dynamic state of emerging magnetic field is related to the twist of field lines. Emergence of magnetic field is considered as one of the key physical process producing solar activity such as flares, jets, and coronal mass ejections. To understand these activities we have to know dynamic nature and electric current structure provided by emerging magnetic field. To demonstrate dynamic nature of field lines, we focus on the factors such as curvature of magnetic field line and scale height of magnetic field strength. These factors show that strong twist case forms two-part structure in which the central part is close to a force-free state while the outer marginal part is in a fairly dynamic state. For weak twist case, it still shows two-part structure but the tendency becomes weaker than strong twist case. We discuss how the curvature distribution affects the dynamic nature of emerging magnetic field. We also investigate electric current distribution provided by emerging field lines to show a possible relation between electric current structure and sigmoid observed in a preflare phase.

• The Transactions of the Korean Institute of Power Electronics
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• v.3 no.1
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• pp.53-60
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• 1998

In this paper, the principle of operation, the part characteristic, characteristic of component movement, analysis are carried out for camcoder iris assembly which is one of the important element component in Video camera large projection TV instrument. And some Know-how for development of element component is also included. The magnetic field circuit for the small and simple structure with low power consumption is introduced and new materials of yoke for small motor system is suggested. Especially, the relation with remained magnetic field and operation duration time is analyzed by experimental results. Some problems of nonlinear torque characteristics included in this system is considered to obtain the simple and low cost structure in domestic production. Furthermore, development procedure is suggested for iris assembly and some methods to reduce the burr with some check points for small precise accessories are explained.

• Journal of the Korean housing association
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• v.19 no.5
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• pp.103-110
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• 2008

The purpose of this study is to know how visual-field obstruction from fire smoke influences a resident's necessary time to reach fire escape and evacuation movement in a high-rise apartment housing. Generally, fire smoke not only gives visual-field obstruction and breath troubles to residents but interrupts their evacuation behavior. If a fire smoke layer is formed in the core department when evacuee enters at the evacuation staircase until, residents will be made to undergo a range of vision obstacle. In order to set a situation like that, participants wore eye bandage which had been made especially before the experiment. Also as a comparative standard, through no.1442 Japanese construction ministry notices about the building evacuation safety verification method, this study calculated smoke layer's dissent time and evacuation time. Then to compare with the former, the participants without an eye bandage joined a experiment once again. This study has understood how fire smoke effects on one's evacuation delay by analyzing residents' evacuation time to reach the staircase and movement route, however, in this study a toxic gas is not considered because it might threaten participants not to breathe.

• Journal of Arbitration Studies
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• v.19 no.3
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• pp.141-160
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• 2009

This article examines some factors that should be taken into consideration as the number of arbitrators to constitute arbitral tribunal, how to select them and the characteristics of arbitrators by their expert field, and the various problems that may arise in selection of arbitrators. When dispute parties select one arbitrator or a chairman of arbitral tribunal, they should consider the characteristic of case. When legal problem is more important, they should select a lawyer, whereas when trade practice is more important, they should select a businessman. Especially, when they decide to select a businessman as one arbitrator or a chairman of arbitral tribunal, they allow him not to write the reason of award if possible because he is lack of know-how to write it. Also, dispute parties should acquire the information of the main career and character of arbitrator, his experience of arbitration and so on before they select him.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1999.06a
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• pp.183-190
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• 1999

We have started the field test of the VOD service since April 1996, in Huis Ten Bosch which is one of the famous theme parks in Japan. In three years, total about 100 thousands people have used this VOD system and evaluated it. This test verifies that the VOD system which provides moving picture by MPEG2 via broad bandwidth ATM network has already reached the level of actual use. And also we get the know-how to construct contents, or how to manage network resources and server resources, and we have proposed them.

• Journal of The Korean Astronomical Society
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• v.14 no.1
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• pp.37-42
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• 1981

In order to know how the magnetic field increases with density in interstellar clouds, we have analyzed observations of extinction and polarization for stars in the ${\rho}$ Oph molecular cloud complex. The size of grains in dense parts of the complex is estimated to be larger than the ones in diffuse interstellar clouds by about 15 percent in radii. Employing the Davis-Greenstein mechanism for grain alignment with this estimated grain size, we have put constraints on the exponent in the field-density relation $B{\propto}n^x:1/5{\leq}x{\leq}1/3$. It is concluded that magnetic field in gravitationally contracting clouds increases less steeply than the classical expectation based on the approximation of isotropic contraction with complete frozen-in flux.

• Journal of the Optical Society of Korea
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• v.15 no.1
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• pp.22-29
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• 2011

We analyze aberrations in an optical laser printer system in order to know how to determine an allowable non-uniformity of the movement of a light spot, how to determine allowed variation of spot sizes, and how to minimize the influence of these deviations on technological errors. In this paper, the correction and the tolerance of distortion are analyzed by using the concept of zonal and global distortions. The tolerance of field curvature is also obtained from Gaussian beam properties. In order to reduce the change of the entrance pupil position and to make a more compact laser printer system the minimum size of the rotator is exactly derived from the geometry with the introduction of the shift angle of the input beam.