LS산전 전력전자 분야 소개

정용호(鄭容昊),이학성(李學成) 전력전자학회 2016 전력전자학회지 Vol.21 No.5

모듈러 데이터센터의 냉각을 위한 마이크로 코제너레이션 시스템 분석

정용호(Jung, Yong-Ho) 한국생태환경건축학회 2019 한국생태환경건축학회 학술발표대회 논문집 Vol.19 No.1

중공사형 멤브래인에 의한 제습시스템의 압력 손실 예측

정용호 한국생활환경학회 2019 한국생활환경학회지 Vol.26 No.1

The shape of the gas separation membrane built into the cartridge of the dehumidifying device was selected as the hollow type and applied to the dehumidification system by the internal and external pressure difference. However, since the hollow fiber type membrane system is installed in a closed form inside the cartridge, excessive pressure loss of the passing air is generated, which may increase the blowing power. Therefore, in this study, the pressure loss of the air passing through the dehumidification cartridge by the installation of the hollow fiber membrane was predicted as the basic research data for the design of the dehumidification system. As a result of the analysis, it was found that the pressure difference at the front and rear end was 4.808Pa when the pressure difference at the upstream and downstream stages was 0.828Pa and 2500CMH, respectively, when the air flow rate was 500CMH, and the overall pressure loss difference was about 5.8 times. It is considered that the pressure loss due to the increase in air volume should be carefully considered.

Multi-electrochemical Signal Generation using Metalloprotein Based on Selective Surface Modification

정용호,유시열,윤진호,민준홍,최정우 한국바이오칩학회 2017 BioChip Journal Vol.11 No.4

In this research, we demonstrate a simple method to generate a multi-peak in a single electrochemical signal for the application to bioelectronics devices. Myoglobin is used as a source of electrochemical signal, and its property of redox peak is controlled by the introduction of various chemical-linking materials. Based on controlled signals of myoglobin, multisignal having dual peak is achieved by the signal combination of six electrodes, which have different electrochemical signals by the modification of each electrode with different kinds of chemical linkers individually. For the device formation, selective immobilization process was performed by using reductive cleavage of pre-immobilized thiol group. As a result, the proposed concept shows simple and effective formation of a multi-signal in a single electrochemical signal as compared with other methods based on heterolayer and hybrid materials, and it can be directly applied to materialize practical bioelectronic devices such as a bio-logic gate or bio-computing system

연간 부분부하 운전특성을 고려한 모듈러 데이터센터의 냉각시스템 효율 분석

정용호 한국생태환경건축학회 2019 한국생태환경건축학회 논문집 Vol.19 No.6

Purpose: Edge computing is indispensable as the demand for fast communication speeds such as autonomous vehicles increases. Edge computing services, which are distributed near processing units, require small and distributed data centers. Currently, in the case of distributed modular data centers, adaptation to domestic weather conditions has arisen by introducing foreign technology directly. In this study, the annual efficiency due to the partial load operation of the cooling system was identified through the energy consumption prediction when the container-type basic module was applied in each region in Korea. Method: E-quest was used to forecast annual energy consumption. Considering the partial load to determine the efficiency of the annual cooling system, the SEER was calculated based on the total input energy and the required energy and the energy consumption efficiency of each region was compared and analyzed. Result: Container-type modular data centers account for 9.2 ~ 21.8% depending on the location of the external load impact. The distribution of SEER was found to be high at 14.04 in the Central 2 region but low at 12.09 in the Jeju region where the outside air temperature was high. In the case of installing cooling facilities of the same capacity, the energy consumption efficiency is different for each region. Therefore, it is necessary to select the capacity considering the local weather conditions when selecting the cooling facilities.

시스템 반도체 FAB의 긴급 주문 납기 만족을 위한 디스패칭 기반의 동적 장비 할당

정용호,함원경,박상철 한국경영과학회 2014 한국경영과학회 학술대회논문집 Vol.2014 No.5

국제 표준을 위한 수소 충전 프로토콜 개발 현황

정용호(Yong-Ho Chung) 호서대학교 공업기술연구소 2021 공업기술연구 논문집 Vol.40 No.2

최근 차세대 에너지원으로 수소에너지가 주목받고 있으며, 특히 차량용으로 수소연료전지를 적용한 다양한 수소전기차가 개발 및 보급되고 있다. 이로 인해 수소전기차의 활발한 보급을 위한 중요한 인프라인 수소충전소의 보급이 활발히 진행되고 있으며, 해당 시설을 운영하는 핵심 기술인 충전 프로토콜에 대한 관심이 집중되고 있다. 기존에 운영 중인 충전소의 충전 규약은 SAE J2601을 적용하고 있으나, 해당 기준은 경량의 수소 차량에 적합한 방식으로, 대용량 혹은 다양한 모빌리티에 종합적으로 적용하기에는 한계점을 가지고 있다. 따라서 세계 각국의 다양한 신규 충전 프로토콜을 개발하기 위해 활발한 연구개발 활동을 진행하고 있으며, 자국에서 개발한 기술을 국제 표준화하려는 움직임도 점차 강해지고 있다. 본 연구에서 기존 프로토콜 및 최근 개발되고 있는 신규 프로토콜에 대해서 비교 분석하여 향후 진행 방향에 대해서 논의하고자 한다. Recently, hydrogen energy has been attracted as a next-generation energy source, and in particular, various hydrogen electric vehicles using hydrogen fuel cells for vehicles are being developed and distributed. As a result, the supply of hydrogen charging stations, which is an important infrastructure for the active dissemination of hydrogen electric vehicles, is actively progressing, and interest in the charging protocol, which is the core technology that operates the facility, is being focused. SAE J2601 is applied to the charging rules of existing charging stations, but this standard is suitable for lightweight hydrogen vehicles and has limitations in comprehensively applying it to large-capacity or various mobility. Therefore, active R&D activities are being carried out to develop various new charging protocols in countries around the world, and the movement to international standardize the technology developed in the country is also getting stronger. In this study, we intend to discuss the future direction by comparing and analyzing existing protocols and new protocols being developed recently.

상호작용 하는 H₂-공기/CO-공기 예혼합화염에 미치는 H₂ 선호 확산 영향에 대한 수치적 연구

정용호,박정,권오붕,길상인,윤진한,Chung, Yong Ho,Park, Jeong,Kwon, Oh Boong,Keel, Sang In,Yun, Jin Han 한국연소학회 2013 한국연소학회지 Vol.18 No.4

The effects of preferential diffusion of hydrogen in interacting counterflow $H_2$-air and CO-air premixed flames were investigated numerically. The global strain rate was varied in the range $30-5917s^{-1}$, where the upper bound of this range corresponds to the flame-stretch limit. Preferential diffusion of hydrogen was studied by comparing flame structures for a mixed average diffusivity with those where the diffusivities of H, $H_2$ and $N_2$ were assumed to be equal. Flame stability diagrams are presented, which show the mapping of the limits of the concentrations of $H_2$ and CO as a function of the strain rate. The main oxidation route for CO is $CO+O_2{\rightarrow}CO_2+O$, which is characterized by relatively slow chemical kinetics; however, a much faster route, namely $CO+OH{\rightarrow}CO_2+H$, can be significant, provided that hydrogen from the $H_2$-air flame is penetrated and then participates in the CO-oxidation. This modifies the flame characteristics in the downstream interaction between the $H_2$-air and CO-air flames, and can cause the interaction characteristics at the rich and lean extinction boundaries not to depend on the Lewis number of the deficient reactant, but rather to depend on chemical interaction between the two flames. Such anomalous behaviors include a partial opening of the upper lean extinction boundary in the interaction between a lean $H_2$-air flame and a lean CO-air flame, as well as the formation of two islands of flame sustainability in a partially premixed configuration with a rich $H_2$-air flame and a lean CO-air flame. At large strain rates, there are two islands where the flame can survive, depending on the nature of the interaction between the two flames. Furthermore, the preferential diffusion of hydrogen extends both the lean and the rich extinction boundaries.

상호작용 하는 H₂-공기/CO-공기 예혼합화염에 미치는 H₂ 선호 확산 영향에 대한 수치적 연구

정용호(Yong Ho Chung),박정(Jeong Park),권오붕(Oh Boong Kwon),길상인(Sang In Keel),윤진한(Jin Han Yun) 한국연소학회 2013 한국연소학회지 Vol.18 No.4

The effects of preferential diffusion of hydrogen in interacting counterflow H₂-air and CO-air premixed flames were investigated numerically. The global strain rate was varied in the range 30-5917 s<SUP>-1</SUP>, where the upper bound of this range corresponds to the flame-stretch limit. Preferential diffusion of hydrogen was studied by comparing flame structures for a mixed average diffusivity with those where the diffusivities of H, H₂ and N₂ were assumed to be equal. Flame stability diagrams are presented, which show the mapping of the limits of the concentrations of H₂ and CO as a function of the strain rate. The main oxidation route for CO is CO + O₂ → CO₂ + O, which is characterized by relatively slow chemical kinetics; however, a much faster route, namely CO + OH → CO₂ + H, can be significant, provided that hydrogen from the H₂-air flame is penetrated and then participates in the CO-oxidation. This modifies the flame characteristics in the downstream interaction between the H2-air and CO-air flames, and can cause the interaction characteristics at the rich and lean extinction boundaries not to depend on the Lewis number of the deficient reactant, but rather to depend on chemical interaction between the two flames. Such anomalous behaviors include a partial opening of the upper lean extinction boundary in the interaction between a lean H2-air flame and a lean CO-air flame, as well as the formation of two islands of flame sustainability in a partially premixed configuration with a rich H₂-air flame and a lean CO-air flame. At large strain rates, there are two islands where the flame can survive, depending on the nature of the interaction between the two flames. Furthermore, the preferential diffusion of hydrogen extends both the lean and the rich extinction boundaries.

[가솔린엔진부문] 경승용차용 5밸브(흡기3밸브) 가솔린 엔진의 연소실 형상 설계 기술에 관한 연구

정용호(Yongho Chung),이기형(Kihyung Lee),이창식(Changsik Lee),성백규(Baikkyu Sung) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

For the development of high efficiency gasoline engine, the optimization of the 5-valve(intake 3valve) combustion chamber for a subcompact vehicle has been studied. Intake multi-valve cylinder heads were manufactured by using a 3-dimension CAD program, and steady state flow experiments have been performed with these cylinder heads. The 5-valve engines, which have larger valve opening areas, have larger intake flow rates and higher flow coefficient than the 4-valve engines. The effects of intake port design parameters of a 5-valve engine on the intake flow rate and bore size were studied, and the design guidelines for the 5-valve engine were established.