• Journal of KIISE:Computer Systems and Theory
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• v.26 no.2
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• pp.223-231
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• 1999

본 논문은 두 개의게이트웨이를 사용한 격자구저망에서 최적의 게이트웨이 위치 설정을 위한 알고리즘을 제안하고 원리를 유도하였다. 최적의 게이트웨이 위치란 격자구조망내 각 노드에서 게이트웨이까지의 평균 최소 링크 수를 가지는 위치로 정의한다. 두 개의 게이트웨이르 사용함으로써 망내의 신뢰도 향상 효과를 가져오며, 우회 경로로 인한 호차단 확률(call blocking probability)과 호설정시간(call setup time)을 최소화한다. 따라서 본 논문에서는 망의 성능을 향상시키기 위하여 두 개의 게이트웨이의 최적의 위치를 결정하는 Grid-Traverse 알고리즘을 제안하고 설정원리들을 유도하여 , 수학적 귀납법으로 이 원리들을 증명하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.52-55
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• 2006

The driving-current degradation of a-Si:H thin-film transistor(TFT) device has been analyzed for the first time. A method to analyze the performance of TFT circuits is presented, which is different from the conventional one by threshold voltage shift method. It can be also used to evaluate the performance of gate driver on array (GOA) circuit, which is integrated in a 12.1" WXGA ($1280{\ast}3{\ast}800$) TFT-LCD panel.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2006.04a
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• pp.317-324
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• 2006

Performance-based design concept is needed to evaluate the seismic capacity of building. In this study, the method estimating the performance point of the spatial structures based on capacity spectrum method (CSM) is proposed. And for efficient evaluation for the performance point of the spatial structures, the algorithm to convert spatial structural system to ESDOF system is simulated Its efficiency is confirmed by comparing with time history analysis of full model. And dynamic behaviors of spatial structures are examined by using this method. At last, evaluation of structural performance according to variation of stiffness after plastic deformation on the substructures is carried out.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1842-1846
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• 2008

This work reports development of novel liquid-level sensors based on the $3{\omega}$ method. The sensors determine the liquid level by measuring the thermal response as in the conventional hot-wire technique. However the sensors employ an AC heating method to enhance the sensitivity, noise resistance and time response. Also, the microfabricated thin-film structure of the sensor provides mass-producibility as well as improved sensor performance owing to the increase in the surface-volume ratio of the sensor. Two different types of the sensor are developed: one for point detection of the fluid phase and the other for monitoring continuous variation of liquid level. Notable is that the performance of the sensor is not considerably affected by the liquid flow.

• The Journal of Korean Medicine
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• v.26 no.3 s.63
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• pp.74-79
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• 2005

Objectives : The purpose of This study was to find the effect of Jeondo-gan (JDS) on acne. Methods : From December 1, 2003 to January 31, 2004, 11 patients with acne were observed, limited to patients who were teated with JDS for more than three weeks. JDS mined with cold water was used on outbreaks of acne, 15 minutes. 1 time per night, 6 times per week. Results & Conclusions : 3 males and 8 females were treated ever three weeks, The average age was 21.73 years old. Before treatment, ache patients had sparse papules on the forehead. both cheeks, and chin, After treatment over three weeks, nine acne patients changed for ihe better at a rate of $81.8\%$ (mild improved $54.6\%$, improved $18.2\%$, much improved $9\%$)

• Journal of international Conference on Electrical Machines and Systems
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• v.2 no.3
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• pp.336-341
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• 2013

Power converter plays a very important role in switched reluctance motor (SRM) systems, and it is also the easiest one to experience failures. Power converter faults will cause the motor to run in non equilibrium states, and a long time fault operation will lead to motor and other modules damaged, and make the system completely lose working stability. This paper uses an asymmetric bridge converter as the research object with three-phase SRM, employs the wavelet packet decomposition for the phase currents. It analyzes and studies the short circuit fault condition of IGBT, uses an energy discrete degree of the wavelet packet nodes as the fault characteristic, and conducts the corresponding experimental and simulation analysis to verify the effectiveness and practicality of the proposed method.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.188-191
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• 2011

Path finding and path planning is crucial in today's world where time is an extremely valuable element. It is easy to plan the optimum path to a destination if provided a map but the same cannot be said for an unknown and unexplored environment. It will surely be exhaustive to search and explore for paths to reach the destination, not to mention planning for the optimum path. This is very much similar to finding for an exit of a maze. A very popular competition designed to tackle the maze solving ability of autonomous called Micromouse will be used as a guideline for us to design our maze. There are numerous ways one can think of to solve a maze such as Dijkstra's algorithm, flood fill algorithm, modified flood fill algorithm, partition-central algorithm [1], and potential maze solving algorithm [2]. We will analyze these algorithms from various aspects such as maze solving ability, computational complexity, and also feasibility to be implemented.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.52 no.1
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• pp.19-24
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• 2003

Design and test results of a VRAG(Vacuum Rotary Arc Gap) switch were presented. To control the damage of electrodes caused by the vacuum arc, Lorentz's force by the radial magnetic field between spiral electrodes was used to rotate the vacuum uc. VRAG switch electrodes were made of the material of CuCr and OFHC. Gap distance between two spiral type electrodes for the rotation of the arc discharge is 8, 10, 12mm. In the cathode, one trigger electrode was inserted into each spiral wing. Normal operation of the VRAG switch was confirmed with 10.6[$mutextrm{s}$]of trigger delay and 2~3[$mutextrm{s}$] of the jitter time. The speed of the vacuum arc was measured to be 0.6 ~ 1[km/s] by a motion analyzer.

• The Bulletin of The Korean Astronomical Society
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• v.44 no.1
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• pp.52.2-52.2
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• 2019

Global map of solar surface magnetic field, such as the synoptic map or daily synchronic frame, does not tell us real-time information about the far side of the Sun. A deep-learning technique based on Conditional Generative Adversarial Network (cGAN) is used to generate farside magnetograms from EUVI $304{\AA}$ of STEREO spacecrafts by training SDO spacecraft's data pairs of HMI and AIA $304{\AA}$. Farside(or backside) data of daily synchronic frames are replaced by the Ai-generated magnetograms. The new type of data is used to calculate the Potential Field Source Surface (PFSS) model. We compare the results of the global field with observations as well as those of the conventional method. We will discuss advantage and disadvantage of the new method and future works.

• Journal of architectural history
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• v.25 no.2
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• pp.45-56
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• 2016

The purpose of this study is to analyze the evolutionary process of Ddeulzip. The subject of this study is a clan family of Andong Kwon in Andong Area. Ddeulzip's evolutionary process of the construction and management is divided into largely three periods in Josun Dynasty. The establishment and changing process of Ddeulzip for Andong Kwon's family are analyzed according to three periods called the early(15~16C), mid(17~18C) and late(19~20C). The characteristics of the early and mid period are that they created their own ancestral building form of Ddeulzip. Those of the late period are in their strong will to make similar scale of Ddeulzip. And during the late period, although the construction of new Ddeulzip was started in the early stage, no more formation of Ddeulzip was made as it approached toward the late stage. And most important point is similar constructional space(gan) of first time. The residential Ddeulzip of Andong Kwon's family created at the 19C can be regarded as an representative example of large space that shows a typical form of housing by noble residents at the time.