• Title/Summary/Keyword: Gyu-Dong Choi

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Assessment of Changes in Temperature and Primary Production over the East China Sea and South Sea during the 21st Century using an Earth System Model (지구시스템 모형을 이용한 21세기 동중국해와 남해의 수온과 일차생산 변화 평가)

  • Park, Young-Gyu;Choi, Sang-Hwa;Kim, Seon-Dong;Kim, Cheol-Ho
    • Ocean and Polar Research
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    • v.34 no.2
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    • pp.229-237
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    • 2012
  • Using results from an Earth System model, we investigated change in primary production in the East China Sea, under a global warming scenario. As global warming progresses, the vertical stratification of water becomes stronger, and nutrient supply from the lower part to the upper part is reduced. Consequently, so is the primary production. In addition to the warming trend, there is strong decadal to interdecadal scale variability, and it takes a few decades before the warming trend surpasses natural variability. Thus, it would be very hard to investigate the global warming trend using data of several years' length.

The Past, Present, and Future of Adoptive T Cell Therapy

  • Choi, Dong-Hoon;Kim, Tai-Gyu;Sung, Young-Chul
    • IMMUNE NETWORK
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    • v.12 no.4
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    • pp.139-147
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    • 2012
  • Although adoptive T cell therapy (ACT) has become a promising immunotherapeutic regime for cancer treatment, its effectiveness has been hindered by several inherent shortcomings regarding safety and efficacy. During the past few decades, several strategies for enhancing the efficacy of ACT have been developed and introduced in clinic. This review will summarize not only the past approaches but also the latest strategies which have been shown to enhance the anticancer activity of ACT.

Development of Welding Automation Technique for Energy-saying Condenser type Welders (절전형 컨덴서 용접 자동화 기술개발)

  • Kim Jin-Woo;Lee Young-Nam;Kim Dong-Uk;Kim Gyu-Sik;Won Chung-Yuen;Choi Se-Wan
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.146-149
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    • 2002
  • 컨덴서식 저항 용접기는 용접에 필요한 에너지를 전해컨덴서에 축척 시킨 후 이것을 순시에 용접변압기로 방전하여 큰 용접전류를 흘리게 된다. 아날로그 제어방식에 의한 기존 컨덴서 용접 시스템은 용접 세팅이 어려웠으며, 시스템의 소손 가능성이 높았고, 크기면에서도 비대해질 우려가 있었다. 이에 비해 디지털제어방식의 중앙집중식 자동화시스템은 사용자가 세팅을 쉽게 할 수 있으며, 전원을 제어함에 따라서 전력소비를 최소화 할 수 있다. 본 연구에서는 마이크로프로세서를 이용한 디지털제어방식의 중앙 집중식 컨덴서식 저항용접 시스템을 제안한다.

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DC/AC Hybrid Distribution System Analysis for Improving Energy Efficiency (에너지 효율 향상을 위한 직류/교류 하이브리드 급전시스템의 해석)

  • Lee, Young-Jin;Han, D.H.;Choi, J.M.;Ban, C.H.;Kim, Dong-Jin;Choe, Gyu-ha
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.244-245
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    • 2010
  • Hybrid distribution system is able to use existing AC load under AC power and DC power by providing existing AC power and proper DC voltage at the same time. and, the future expected DC appliance is also available. Hybrid distribution system is divided into two different type. the one is DC common method and the other is AC common method. This paper design each system, and study operating characteristics for improving energy efficiency.

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A Hierarchical Motion Controller for Soccer Robots with Stand-alone Vision System (독립 비젼 시스템 기반의 축구로봇을 위한 계층적 행동 제어기)

  • Lee, Dong-Il;Kim, Hyung-Jong;Kim, Sang-Jun;Jang, Jae-Wan;Choi, Jung-Won;Lee, Suk-Gyu
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.9
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    • pp.133-141
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    • 2002
  • In this paper, we propose a hierarchical motion controller with stand-alone vision system to enhance the flexibility of the robot soccer system. In addition, we simplified the model of dynamic environments of the robot using petri-net and simple state diagram. Based on the proposed model, we designed the robot soccer system with velocity and position controller that includes 4-level hierarchically structured controller. Some experimental results using the stand-alone vision system from host system show improvement of the controller performance by reducing processing time of vision algorithm.

A Study on Deriving Vulnerable Area and its Reformation Way from Accessibility Analysis of Jurisdiction of Daegu City Fire & Rescue Stations (대구시 소방권역별 접근성 분석을 통한 구조대 도달 취약지 도출 및 개선방안에 관한 연구)

  • Jeong, Gyu-Dong;Lee, Ji-Soo;Choi, Jun-Ho;Hong, Won-Hwa
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2012.04a
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    • pp.170-173
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    • 2012
  • 화재상황에서 가장 우선시 되는 것은 신속하고 안전한 인명의 구조이므로 구조대의 역할은 매우 중요하여 이와 관련된 기준을 법에서 별도로 지정하고 있다. 그러나 현재 구조대의 편성과 배치는 시도별 상황이나 재정여건 등에 따라 상이한 편으로, 구조대 접근에 있어 취약지가 발생하는 것도 사실이다. 이에 본 연구에서는 실제 도로 데이터와 응급구조 차량의 특성을 고려한 접근성 분석을 통해 대구광역시의 구조대 도달 취약지를 도출하고 이에 따라 개선방안을 제시하고자 한다.

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A Study on Optimum Acceleration Profile to Reduce Vibration of PMLSM (PMLSM의 진동저감을 위한 최적의 속도 프로파일일 관한 연구)

  • Lee, Dong-Yeup;Yoon, Kang-Jun;Jung, Chun-Gil;Kim, Gyu-Tak;Choi, Yong-Hyu
    • Proceedings of the KIEE Conference
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    • 2004.10a
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    • pp.98-100
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    • 2004
  • This paper is proposed vibration minimize method of PMLSM which is designed to minimize detent force. To minimize of vibration at acceleration discontinuous point of velocity curve, genetic algorithm is applied. The vibration characteristic is compared general trapezoid velocity curve with proposed velocity profile.

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Study on the Optimal Velocity of Horizontal Air Jet of a Range hood system (주방용 후드 수평급기의 최적속도 결정에 관한 연구)

  • Kim, Sang-Gyu;Park, Sung-Geun;Yong, Ho-Taek;Kim, Dong-Yoon;Choi, Hyoung-Gwon
    • Proceedings of the SAREK Conference
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    • 2005.11a
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    • pp.63-68
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    • 2005
  • In the present paper, the study on the optimal horizontal air jet velocity of a range hood system has been studied by three dimensional numerical simulation. It has been shown that the air jet of a range flood system generates coanda effect confining the contaminated (high temperature) air in a certain region while the jet pushes out more contaminated air into a room as the jet velocity increases. Therefore, the optimal jet velocity has been determined by the combination of the two mechanism.

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The clinical observation of three case of Herpes zosters (帶狀疱疹 患者의 治驗3例 報告)

  • Choi, Gyu-Dong;Chae, Bhung-Yoon
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.10 no.1
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    • pp.349-356
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    • 1997
  • an acute, unilateral, self-limited inflammatory disease of cerebral ganglia and the ganglia of posterior nerve roots and peripheral nerves in a segmented distribution, caused by the chickenpox virus, and characterized by groups of small vesicles in the cutaneous areas along the course of affected nerves, and associated with neuralgic pain. three case of herpes zoster has severe post herpetic neuralgia. these patients has been treated with westernmedicine. But they could not expect to improve condition. We exprienced three cases of herpes zoster that have a result of effect with oriental treatment and lazer threaphy.

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