• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.7-12
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• 2003

heat pipe with screen meshed wick. The heat pipe was designed in 200 screen meshs, 500 mm length and 12mm O.D tube of copper, water as working fluid and nitrogen as non-condensible gas. Heat pipe used in this study has evaporator, condenser and adiabatic section, respectively. Experimental data of wall temperature distribution along axial length is presented for heat transport capacity, condensor cooling water temperature change, degrees of an inclination angle, and operating temperature.

• International Journal of Fluid Machinery and Systems
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• 제8권1호
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• pp.13-22
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• 2015

This study presents a simulation model of a heat pump air conditioning system with a variable capacity compressor and variable speeds fans for electric bus. An experimental sample has been developed in order to check results from the model. Effects on system performance of such working conditions as compressor speed, evaporator fans speeds and the condenser fans speeds have been simulated by means of developed model. The results show that the three speeds can be adjusted simultaneously according to actual working condition so that the AC system can operate under the optimum state which the control objects want to achieve. It would be a good and simple solution to extend the driving ranges of EVs because of the highest efficiency and the lowest energy consumption of AC system.

• International Journal of Contents
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• 제5권3호
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• pp.71-78
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• 2009

Recently, interest has heightened over 'critical infrastructures' and their reliability in the face of potential terrorist attack. Assault on any of the critical infrastructures as transportation, power, water, telecommunications, and financial services, entails great consequences for their users as well as the other interdependent critical infrastructures. How to protect our vital critical infrastructures is the key question in this paper. The purpose of this article is to suggest the implications for crisis and emergency management to protect the critical infrastructures in our society. For achieving the purpose, we examined the concept of comprehensive security, national crisis, and critical infrastructure and, using the holistic approach, we examined the comprehensive emergency management for suggesting the implications for establishing the critical infrastructure protection system; building up the high reliability organization, organizing and partnering, assessing the risk, preparing first responders, working with private owners of critical infrastructures, working with communities, improving the administrative capacity.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 춘계학술대회
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• pp.1225-1230
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• 2004

In this paper, the pressure drops were investigated according to the sintered porous wick structure in loop heat pipe(LHP) by theoretical analysis. LHP has the wick only in evaporator for the circulation of working fluid, so utilizes porous wick structure which pore diameter is very small for large capillary force. This paper investigates the effects of different parameters on the pressure drops of the LHP such as particle diameter of sintered porous wick, wick porosity, vapor line diameter, thickness of wick and heating capacity. Working fluid is water and the material of sintered porous wick is copper. According to the these different parameters, capillary pressure, pressure drop in wick were analized by theoretical design method of LHP.

• Journal of Biosystems Engineering
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• 제38권1호
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• pp.18-24
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• 2013

Purpose: This study was conducted to develop an optimal combine scheduling program using Max-Coverage algorithm which derives the maximum efficiency for a specific location in harvest seasons. Methods: The combine scheduling program was operated with information about combine specification and farmland. Four operating types (Max-Coverage algorithm type, Boustrophedon path type, max quality value type, and max area type) were selected to compare quality and working capacity. Result: The working time of Max-Coverage algorithm type was shorter than others, and the total quality value of Max-Coverage algorithm and max quality value type were higher than others. Conclusion: The developed combine scheduling program using Max-Coverage algorithm will provide optimal operation and maximum quality in a limited area and time.

• International Journal of Air-Conditioning and Refrigeration
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• 제13권4호
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• pp.217-224
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• 2005

The purpose of this study was to develop a cooler/heater using a thermoelectric module combined with a parallel flow type pulsating heat pipe with R-142b as a working fluid. The experiment was performed for 16 thermoelectric modules (6A/15V, size: $40\times40\times4mm$), varying design parameters of the heat pipe (inclination angle, working fluid charging ratio, etc.). Experimental results indicate that the optimum charging ratio and the inclination angle of the parallel flow type pulsating heat pipe were $30\%$ by volume and $30^{\circ}$, respectively. The maximum cooler/heater capacity were 479 W (COP: 0.47) and 630 W (COP: 0.9), respectively.

• 설비공학논문집
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• 제16권12호
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• pp.1107-1116
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• 2004

In this paper, the effects of diverse parameters on the operation of loop heat pipe (LHP), such as particle diameter of sintered porous wick, wick porosity, vapor line diameter, thickness of wick and heating capacity were investigated by a theoretical analysis. A LHP has a wick only in its evaporator for the circulation of working fluid, and utilizes a porous wick structure of which pore size is very small to obtain a large capillary force. The working fluid is water and the material of sintered porous wick is copper. For these different parameters, capillary pressure, pressure drop in wick, pressure drops and temperature distribution were analyzed by a theoretical design method of LHP.

• 융합정보논문지
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• 제7권4호
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• pp.113-119
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• 2017

본 연구의 목적은 사회복지시설종사자의 융합적 직무역량강화가 삶의 질에 영향을 미치는지를 검증하는 것이다. 연구의 목적을 달성하기 위해 서울시 20개, 경기지역 20개 사회복지시설에 근무하는 사회복지종사자들을 대상으로 설문을 하였고, 회수된 188부를 연구에 사용하였다. 표본추출법은 비확률표집법에서 임의표집법을 활용하였다. 연구결과, 사회복지종사자의 역량강화정도와 삶의 질간의 관계에서 살펴보면 개인역량과 만족감, 환경역량과 불만족감, 관계역량과 만족감에서만 정적인 상관이 있었고, 나머지영역에서는 상관이 없는 것으로 나타났다. 그리고 사회복지종사자의 개인역량, 환경역량이 불만족감에 정(+)적인 역할을 하는 것으로 나타났다. 또한, 관계역량이 불만족감에 부(-)적인 역할을 하는 것을 볼 수 있다. 개인역량정도, 이직하고자 하는 마음을 통제하는 역량정도, 관계역량이 만족감에 정(+)적인 역할을 하는 것을 볼 수 있다. 따라서 사회복지종사자의 삶의 질을 향상시키기 위해서는 사회 복지종사자들을 대상으로 직무역량강화 교육프로그램을 실행할 때에 긍정적인 효과가 있을 것으로 기대한다.

• 한국심리학회지 : 문화 및 사회문제
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• 제22권1호
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• pp.41-64
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• 2016

본 연구에서는 두 개의 실험연구를 통해 질투와 존경의 이득을 자기향상의 동기화와 정보처리의 측면에서 비교하고, 작업기억용량의 개인차가 정서조절에 영향을 주는지를 분석하였다. 연구 1에서는 참가자(N=38)들의 작업기억용량을 측정한 후, 질투나 존경 중의 한 가지 조건에서 자신의 경험을 생생하게 머릿속에 떠올려보게 하였다. 그 결과 질투조건에서는 존경조건보다 타인의 우월성을 합당하다고 인식하는 정도가 낮게 나타났다. 또한 질투조건에서는 작업기억용량이 높을수록 행복감이 높았으며, 불안이 증가할수록 자기향상을 위한 학습시간을 증가시키려는 경향이 나타났다. 반면 존경조건에서는 작업기억용량과 정서, 학습시간과의 관계가 유의하지 않았다. 연구 2(N=43)에서는 참가자들의 작업기억용량을 측정한 후, 질투/존경/통제조건에서 질투시나리오에 대한 회상을 비교하였다. 그 결과 질투조건에서 존경/통제조건보다 시나리오 회상율이 더 높게 나타났다. 또한 질투조건에서는 참가자의 작업기억용량이 높을수록 불안을 더 적게 느꼈고, 정확회상율이 더 높았던 데 비해, 존경/통제조건에서는 작업기억용량, 불안 및 회상율과의 관계가 유의하지 않았다. 이 결과는 질투가 정보처리과정에서 중요한 역할을 할 가능성을 보여주며, 작업기억용량이 정서조절능력과 관계있음을 시사한다.

• 한국국방경영분석학회지
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• 제30권1호
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• pp.92-106
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• 2004

This is a case study which establishes effective ammo issue plan and determines ammo support capability by linking various situations about ammo issue with wargame simulation. Ammo function simulation model has been developed for this matter and it has been proven that the model has significant impact on type of round, parking space for magazine, number of workers and capacity of equipment, etc. during establishing ammo issue plan and determining ammo supply capability. Also, ammo support capability varies significantly depending on tactical damage and MOPP status, etc. ASP's tactical situation, such as magazine damage, MOPP status, type of issuing round, parking space for magazine, number of workers and capacity of equipment, can be reflected when preparing an effective wartime ammo working hour issuing plan for supplying ammo to units through studies results, so that the issuing plan can be realistic and actual.