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정용호(Jung Yong-Ho),손장열(Sohn Jang-Yeul) 한국건축친환경설비학회 2009 한국건축친환경설비학회 논문집 Vol.3 No.3
District Heating System(DHS) is one of the most excellent systems in terms of energy saving and environmental protection. The current indirect connection in Korea is applied to the case of big scale, it brings about heat loss in its network. Moreover, high-priced heat exchanger facilities are required. Direct connection has some advantages such as energy saving and low initial cost compared with indirect connection since heat exchange is not required in machine room. However, direct connection is not economical for heavy load and it is difficult to keep the temperature of supply water low. When direct connection is applied, it is the most important to supply stable heat source to consumers. Therefore, the objective of this study is to offer the fundamental data for applying the direct connection in district heating to Korea by investigating the pressure variation based on supply condition and stability for consumers from the previous studies. The results of this study are follows; I) In case the supply pressure is 6bar, direct connection is feasible for 5-floor-apartments and detached houses without booster pump by the analysis of pressure variation at consumer facilities. 2) 5~6bar was required in 10-floor-apartments for direct connection and in case of 15-floor apartments, 6bar was necessary to prevent minus pressure without booster pump. 3) In case of 20-floor-apartments, supply pressure of 6bar could not be applied since minus pressure occurred in the top of the apartments.
2D 애니메이션에서 색 변환행렬을 이용한 캐릭터의 자동 색 변환
정현선(Hyun-Sun Jung),문용호(Yong-Ho Moon),김재호(Jae Ho Kim) 한국멀티미디어학회 2007 멀티미디어학회논문지 Vol.10 No.10
본 논문은 2D 애니메이션 캐릭터의 자동 색 지정을 위하여 애니메이션 장면 간의 캐릭터 색 변환 기술에 대해 제안한다. 사람이 지각하는 색은 조명이 달라지면 다른 색으로 지각된다. 이와 마찬가지로 애니메이션 장면에 등장하는 캐릭터도 의상, 피부 등의 색이 장면 분위기에 따라 각각 다르게 지정되고 있다. 본 논문은 이러한 2D 애니메이션 장면 간의 캐릭터 색 지정을 수작업에 의존하지 않고 수학적으로 해결하기 위해 시도한 것으로써 조명에 따른 색 원리를 이용하여 장면 간의 캐릭터 색 변환을 위한 행렬을 유도하였다. 이 색 변환행렬은 애니메이션 장면마다 각각 구해지는데, 기존의 2D 애니메이션에 등장하는 통일캐릭터의 기본색과 각 장면속의 색을 이용해서 구해진다. 이렇게 구한 색 변환행렬은 어떠한 캐릭터의 기본색만 주어진다면 다양한 장면 분위기와 잘 어울리는 색으로 변환이 가능해진다. We introduce technique for color transformation of characters between scenes in 2D animation. As colors are perceived differently owing to light source, so character colors like clothes, skin and so on are colored differently owing to atmosphere of each scene. This paper is made an attempt to solve mathematically color assignment of characters which has been worked by hand so far. We can find a matrix for color transformation of characters by appling principle of color stimulus to our algorithm In scenes of existing 2D animation, basic colors and colors under light source of characters are used for the matrix. And matrixes are obtained for each scenes of 2D animation. If we are known basic colors of some characters, you can derive character colors under other light source environments using the matrix. Therefore, this paper describes automatic color transformation of characters between animation scenes.
정용호(Yong-Ho Jung),박성룡(Seong-Ryong Park) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.12
The summer climate is very hot and humid in Korea. Humidity is an important factor in determining thermal comfort. Recently, research on dehumidification device development has been attempted to save the energy required for operating the dehumidifier. Existing dehumidification systems have disadvantages such as wasting energy to drive the compressor. Meanwhile, dehumidification systems with membranes can dehumidify humid air without increasing the dry bulb temperature. Therefore. they don’t have to consume cooling energy. In this paper, the installation conditions for a membrane system were analyzed to improve the shape and optimum performance of the system. The results showed that the distance between elements was the critical system design factor, and that a distance of 20 mm was the optimal condition for the pressure drop and flow characteristics of the internal air flow.
모듈러 데이터센터 냉각시스템의 취출온도 조건에 의한 연간에너지 소비량 예측
정용호(Yong-Ho Jung) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.1
The modular data center is greatly influenced by operating conditions because its internal size is smaller than the existing hyperscale data center. The recent emergence of servers that can adapt well to indoor temperature rise requires a review of existing temperature conditions. In this study, the potential for temperature condition mitigation and annual energy performance were analyzed for recent installations of improved thermal performance servers in container-type distributed modular data centers. According to the analysis, the upper dry bulb temperature of the intake air for maintaining the recommended level, acceptable level A1, and acceptable level A2 was 14℃, 16℃, and 19℃ respectively. The annual energy savings predicted in the analysis was 3.1% and 9.2%, when the intake air temperature of the servers in the modular data center was mitigated to the A1 and A2 levels respectively.
정용호(Yong Ho Chung),함원경(Won K. Hwam),박상철(Sang Chul Park),최정주(Jung Ju Choi) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
This paper proposes algorithm for efficient fixture modeling for automotive body assembly line that should be remodeled frequently whenever changes of design occur. A fixture model consists of geometric model and kinetic model. We develop an algorithm extracting kinetic model from geometric model. In automotive body assembly lines, Kinetic models of fixtures mostly follow the same mechanism, the so-called slider-crank mechanism; this is a four-axis system of three revolute and one prismatic joint. It is very important to identify the prismatic axis from a given geometric model to extract the kinetic model of a fixture. We employ the concept of collision detection. The result of collision detection is a Boolean saying whether two or more objects collide.
정용호(Yong-Ho Jung),손장열(Jang-Yeul Sohn) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.3
This study evaluates ventilation performance for apartment using solar radiation in order to improve energy savings and indoor air environment. Field measurements were performed in a full-scale mock-up model. A solar collection device and ordinary device for natural ventilation were installed in each room. Temperature and airflow velocity were monitored in each five minutes. Solar radiation and daylight illuminance were also measured. The concentration of indoor air for two conditions was monitored using a multi-gas monitor and tracer gas. The air change rates per hour (ACH) under the conditions were computed based on the concentrations. The air change rates per hour (ACH) using solar radiation exceeded the required air change rate per hour was linearly proportional to the solar radiation. The ventilation device using solar radiation contributed to provide better thermal environment with energy savings. In addition, it achieved better indoor air environment for residents compared with the natural ventilation device. In summary, the ventilation device using the solar collection device used in this study appears to provide increased ventilation rate per hour continuously.
정용호(Jung, Yong-Ho) 한국건축친환경설비학회 2012 한국건축친환경설비학회 논문집 Vol.6 No.1
Energy Cost has been rapidly increased with the internal heat gain of data center to keep the temperature condition. But the cooling units for server systems are fully operated to satisfy the indoor temperature condition, it results in the excessive energy consumption. In this study, various cooling systems were studied for data center and cold aisle containment system was proved to be the best solution for server cooling system. Because it protects the cooling zone from the hot aisle space. Effective cooling and prohibition of recirculation air from hot aisle was possible by the cold aisle containment system.