• 한국시뮬레이션학회논문지
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• 제22권4호
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• pp.67-82
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• 2013

본 논문은 공학급 국방 모델의 시뮬레이션 성능 향상을 위해 다중 충실도(Multi-fidelity) 모델링 시뮬레이션(M&S: Modeling and Simulation) 기법을 제안한다. 제안하는 기법은 다양한 충실도를 지닌 모델을 활용하여 고 충실도 모델의 시뮬레이션과 비교하여 유사한 수준의 시스템 분석 결과를 얻음과 동시에 시뮬레이션 성능 측면에서 이득을 가져오는 방안이다. 다중 충실도 원리를 적용하기 위해 본 논문은 충실도를 모델 동작과 실행 측면으로 세분화하고, 충실도 변환 지점을 FCP (Fidelity Change Point)로 정의한다. 이러한 원리를 바탕으로 본 논문은 다음의 세 가지 쟁점을 다룬다. 먼저, 모델 동작과 실행 측면의 충실도 변환을 위한 모델 구조와 제안하는 모델에 대한 수학적 형식론, 마지막으로 모델 실행을 위한 시뮬레이션 알고리즘을 제안한다. 사례 연구로 어뢰의 표적 추적 시나리오에 대한 기초 실험을 수행하였고, 실험 결과 제안하는 기법을 사용한 경우 기존의 시뮬레이션과 비교하여 최대 4.24배의 시뮬레이션 성능 향상을 보임을 확인하였다. 본 논문에서 제안하는 기법은 M&S 기반의 시스템 분석을 하는 다양한 분야에서 활용될 수 있음을 기대한다.

• 정보교육학회논문지
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• 제5권3호
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• pp.321-328
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• 2001

일반적으로 학습을 게임과 접목한 프로그램들은 대부분 오프라인을 기반으로 제작되어왔다. 하지만 최근 인터넷 기술의 급격한 발달로 인하여 웹을 기반으로 한 학습 프로그램의 이용이 증가하고 있다. 이에 개인 학습을 위한 기존의 오프라인 게임을 온라인에 기반한 학습용 게임으로 제작한다면 보다 많은 학생들이 쉽게 교육용 게임을 접할 수 있으며 오프라인에서와는 달리 경쟁 및 보상 개념의 도입이 쉬우므로 학습자들의 학습 의욕 향상에도 도움이 될 것이다. 본 논문은 이러한 개념을 바탕으로 초등학교 수학과 도형수업을 수준에 맞게 학습할 수 있는 온라인 롤플레잉 게임을 설계하여 보았다. 초등학생을 위한 수학 온라인 롤플레잉게임은(Mathematical On-line Roll playing game for Elementary school student)은 기존의 온라인 롤플레잉게임의 특성을 학습의 요소와 대응시키고 개인의 학습 의욕을 학업 능력치 등으로 나타냄으로써 학습자들의 자발적인 학습을 유도하였다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2000년도 춘계공동학술대회 논문집
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• pp.53-56
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• 2000

그로벌최적화문제(Global optimization problem)의 부류인 다목적선형계획법 ( MOLP ) (Multiple objective linear programming)에서 결정된 유효해집합(a set of efficient solutions)위에서 선형함수 최적화문제 ( Ρ )는 해집합이 볼록집합이 아니므로(nonconvex set) 일반적인 선형계획법을 활용하기가 어렵다. 현재까지 ( Ρ )의 최적화를 위해서 유효해집합의 모든 꼭지점(extreme point)를 찾거나 일련의 선형계획문제들을 최적화하여 최적해를 찾는 접근방법들이 있다. 이러한 방법들에는 ( MOLP )의 해집합의 차원(dimension)이 커짐에 따라 문제해결이 실제적으로 가능하지 않는 경우가 많다. 본 연구는 주어진 선형함수와 다목적선형함수들간 관계를 고찰하여 선형목적함수를 구성하고 그 목적함수를 이용하여 주어진 문제 (Ρ) 의 최적해를 찾는 선형계획적 접근방법을 제안한다.

• 대한지역사회영양학회지
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• 제4권4호
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• pp.546-553
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• 1999

This study was undertaken to develop and evaluate a nutrition education program with internet for students. A survey was conducted to find out needs for nutrition education program with 430 college or high school student in October, 1997. Eighty four point eight percent of female and 36.0% of male students had a plan to reduce their weight in a near future. Forty four point four percent of subjects obtained information about weight control from mass media, 28.6% of subjects obtained from their neighbor's recommendation. The information wanted to know were high-calorie foods, answered by 42.1% of females, and calorie expenditure of exercise, answered by 31.9% of males. The obese group showed higher preferrence to sweet foods, salty foods, hot foods, convenience foods, processed foods, animal foods, fried and oily foods, and eating-out than normal group(p<0.05). The obese group also showed a tendency of bad food habits, low intake of seaweeds, high intakes of animal fat, cholesterol-rich foods and salty foods. Amount of food intakes was inappropriate in obese group. An internet program for nutrition education was developed using the results of the survey and juvenile nutrition programs. The program consisted of 6 steps ; step 1 was to check one's physical status, step 2 was explanation about good food habits, step 3 was about food management, step 4 was methods of exercise for health, step 5 included how to maintain ideal weight, and step 6 was related-internet site. Pre-education test and post-education test was conducted to evaluate the nutrition education through internet. The score of nutrition knowledge increased from $74.2{\pm}7.4$ to $77.2{\pm}9.6.$ The score of food attitude did not change. The subjects wanted more information about nutrition from internet. Therefore, internet program of nutrition education with specific and interesting topics should be developed more.

• 천문학회보
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• 제37권2호
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• pp.110.2-110.2
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• 2012

We investigate a cool loop and a dark lane over a limb active region on 2007 March 14 by the Hinode/EUV Imaging Spectrometer (EIS). The cool loop is clearly seen in the EIS spectral lines formed at the transition region temperature (log T = 5.8). The dark lane is characterized by an elongated faint structure in coronal spectral lines (log T = 5.8 - 6.1) and rooted on a bright point. We examine their electron densities, Doppler velocities, and non-thermal velocities as a function of distance from the limb using the spectral lines formed at different temperatures (log T = 5.4 - 6.4). The electron densities of the cool loop and the dark lane are derived from the density sensitive line pairs of Mg VII, Fe XII, and Fe XIV spectra. Under the hydrostatic equilibrium and isothermal assumption, we determine their temperatures from the density scale height. Comparing the scale height temperatures to the peak formation temperatures of the spectral lines, we note that the scale height temperature of the cool loop is consistent with a peak formation temperature of the Mg VII (log T = 5.8) and the scale height temperature of the dark lane is close to a peak formation temperature of the Fe XII and Fe XIII (log T = 6.1 - 6.2). It is interesting to note that the structures of the cool loop and the dark lane are most visible in these temperature lines. While the non-thermal velocity in the cool loop slightly decreases (less than 7 km $s^{-1}$) along the loop, that in the dark lane sharply falls off with height. The variation of non-thermal velocity with height in the cool loop and the dark lane is contrast to that in off-limb polar coronal holes which are considered as source of the fast solar wind. Such a decrease in the non-thermal velocity may be explained by wave damping near the solar surface or turbulence due to magnetic reconnection near the bright point.

• 패션비즈니스
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• 제4권1호
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• pp.73-85
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• 2000

The purpose of this study is for considering about Zen fashion in the point of view of culture transition. Through this research, the Far-East including Korea will be confirmed as a center of fashion culture in 21st century. The contents are the meaning of culture transition in Post Modern period, the meaning of Zen and changing of fashion trend as the background of Zen Fashion, and the characteristics of Zen fashion design. The results are as follows: Anti-western movement or dismantlement of culture has been represented the limitation of western centered culture. So the interesting about East means the changing to east from west in ideas. To make new creation in fashion field, the comprehension about the western fashion which has been preceeded and new trials using the our tradition will be needed. Zen is a kind of Buddhism and the essence of it is to find myself and express individual experiences. The change of one's sens of value, new age movement and concerning of environment and ecology make more comfortable, simple and healthy elements in clothing. The fusion style is under a vogue in life style and Zen is the core of this trend. The characteristics of Zen fashion are flat dismantlement which has been know as a Japanese style, oriental minimalism and nature beauty of ecology. This characteristics are found not only the shape, color but the will of the behind. The pursing temperance and naturalism are represented the fashion culture transition from the West to Far-East. Therefore multi points of fashion research is very important and the identify about Korean fashion is required in lately for new fashion paradigm.

• 비교문화연구
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• 제38권
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• pp.215-243
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• 2015

This paper looks at the literary mood of southwestern Russia in the late Russian Empire, while examining the writers of this area and their literary tendencies. Southwestern literature was formed in the late Russian Empire, and prospered centering around Odessa. Because of the uniformity in the Soviet culture, however, it could not stay alive but disappeared in the history of Russian literature. Odessa, the center of southwestern literature was a multiracial region unlike other Russian cities. A unique culture was created, therefore, combining the western European culture and local ethnicity. Jews in Odessa could enter into the Russian society and assimilate naturally. They could utilize their talents as a strength to enrich the Russian culture without giving up their cultural heritage. For example, in lingual aspects, using Yiddish was not against the Russian culture. In addition, it contributed to interesting new coinages and led to efforts among writers to minimize the gap between the two languages. Many Jewish writers showed special interest not only in Yiddish but also in French, German and other languages. Therefore, they took the lead in translating and introducing west classics. As evident in the way Yiddish language was formed, mixing their language with other languages enabled jews to soak their way into other cultures naturally. Their yearning for the Russian and western European cultures, combined with their unique sense of humor, led to generic twists and problematic experiments. From another point of view, it is also unusual that southwestern literature diversified locational settings and heroic characters in literary works. European style heros, appearance of multiracial people, pain or waggery experienced by Jews in their assimilation process, thrilling revenge to unfair violence of Russians, and espiegle swindlers are the new domains that southwestern literature pioneered. In summary, southwestern literature was formed in a heterogeneous cultural climate, which was entirely different from the Russian Empire. In this regard, it was in deviation from the Russian literary tradition. From the Soviet point of view, it existed as a heresy which was against the Russian Empire.

• Structural Engineering and Mechanics
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• 제11권6호
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• pp.637-650
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• 2001

A structural analysis of cracked R.C. members under instantaneous or sustained loads and imposed displacements is presented. In the first part of the paper the problem of deriving feasible moment-curvature diagrams for a long term analysis of R.C. sections is approached in an exact way by using the Reduced Relaxation Function Method in state I uncracked and the method suggested by CEB in state II cracked. In both states the analysis of the main parameters governing the problem has shown that it is possible to describe the concrete creep behaviour in an approximate way by using the algebraic formulation connected to the Effective Modulus Method. In this way the calculations become quite simple and can be applied in design practice without introducing significant errors. Referring to continuous beams, the structural analysis is then approached in a general way, applying the Force Method and the Principle of Virtual Works. Finally, considering single members, the structural analysis is performed by means of a graphical procedure based on the application of feasible moment-rotation diagrams which allow to easily solve various structural problems and to point out the most interesting aspects of the long term behaviour of cracked R.C. members with rigid or elastically deformable redundant restraints.

• 수산해양교육연구
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• 제7권1호
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• pp.111-126
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• 1995

In general, the electromagnetic transient phenomenon always exists in induction motor(IM) with the torque change. The control performance of IM is very worse than that of D.C motor owing to this transient phenomenon. So many studies about the elimination methods of the transient phenomenon have been making progress. Interesting methods of them are the Field acceleration method(FAM) and the method of impulse addition on the input voltage at the time point of torque change. In this paper, first, the circuit equation of IM is derived from the phase segregation method. The torque equation consisted of the stator and rotor currents is derived from the solving of the circuit equation. As we well known, the transient terms exist in this the torque equation. The method of impulse addition on the input voltage at the instance of torque change is confirmed theoretically for the elimination of the transient phenomenon. With the base on it, the author proposed a real time algorithm to eliminate the transient terms. The control system is consisted of the PI controller with the feedforward of torque change. The author could confirm that the quick stepwise responses of torque and speed can be obtained from response simulations.

• 제어로봇시스템학회논문지
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• 제17권7호
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• pp.659-667
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• 2011

The study of bipedal robot is towards similar shape and function with human. In this paper, we propose a human-like walking pattern compatible to the flexible foot with toe and heel structure. The new walking pattern for a bipedal robot consists of ZMP, center of mass (CoM), and ankle trajectory and is drawn by considering human kinesiology. First, the ZMP trajectory moves forward without stopping at a point even in the single support phase. The corresponding CoM trajectory to the ZMP one is derived by solving differential equations. As well, a CoM trajectory for the vertical axis is added by following the idea of human motion. The ankle trajectory closely mimics the rotational motion of human ankles during taking off and landing on the ground. The advantages of the proposed walking pattern are demonstrated by showing improved stability, decreased ankle torque, and the longer step length capability. Specifically, it is interesting to know that the vertical CoM motion is able to compensate for the initial transient response.