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미연성 냉매를 적용한 공조시스템의 설계 및 설치 가이드
김병수(Byeongsu Kim),정한솔(Han Sol Jung),강용태(Yong Tae Kang),김용찬(Yongchan Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
The purpose of this study is to present the design and installation guideline of an air conditioning system using mildly flammable(A2L) refrigerants and to utilize it for revising the domestic Standard KC 60335-2-40. The ignition possibility of electrical equipments and AIT(Auto ignition temperature) have to be evaluated with the consideration of air conditioning system designs. Warnings relating to flammability must be marked on the product and should be designed and packaged to withstand the effects of vibration during transport. In addition, refrigerant leakage should not occur during normal or abnormal operation, and the maximum refrigerant charge is determined by four formulas depending on the presence of additional devices, such as ventilation or safety valves. It is necessary to apply the leakage detection and ventilation devices according to the product type, installation type and space, which are described in the JRA Standard of JRAIA(Japan Refrigeration and Air conditioning Industry Association).
다양한 클라우드 스토리지 서비스의 효율적인 통합에 관한 연구
박병수 ( Byeongsu Park ),박진혁 ( Jinhyuck Park ),임성현 ( Seonghyeon Lim ),유준열 ( Junyeol You ),김영종 ( Youngjong Kim ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.1
최근 세계 클라우드 시장 규모가 증가함에 따라 기업의 클라우드 서비스 이용률과 더불어 개인의 클라우드 서비스 이용률 또한 높은 증가율을 보여주고 있다. 이에 따라 AWS S3, GCP Cloud Storage와 같은 기업용 멀티 클라우드 스토리지 서비스의 효율적인 통합에 대한 연구는 활발하게 이루어지고 있다. 그러나, 이러한 접근법을 개인용 멀티 클라우드 스토리지 서비스의 효율적인 통합에 적용하기에는 가격 모델의 상이함과 더불어 여러 요인에 따른 어려움이 있다. 본 논문에서는 이를 해소하기 위해 기존의 가격 모델을 단순화하여 개인용 멀티 클라우드 스토리지 서비스를 효율적으로 통합하는 방법에 대해 제시한다.
엔진 웜업시 오일온도에 따른 엔진 마찰이 차량 모드 연비에 미치는 영향
김병수(Byeongsu Kim),임건병(Gunbyoung Lim),이병옥(Byoungohk Rhee),박진일(Jinill Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently Simulation resulted in developing computer is attempting to experiment vehicle driving not using expensive instruments. It is possible to presuppose fuel economy by changing the characteristic of accessories using CRUISE(vehicle simulation software). In this paper, fuel consumption at each part of the vehicle is analyzed from experiment. The results of fuel economy analysis on experiment substitute for Cruise to measure fuel economy. The achieved simulation data such as engine speed, brake torque, shift pattern, vehicle speed, fuel consumption level is almost equal to experiment data. In this paper, it is performed that warm-up time of engine oil temperature is faster or slower through simulation. The faster engine oil warm-up time is, the more engine friction is decreased. As a result of decreasing of engine friction, fuel economy is improved maximum up to 1.7%.
Nano-Fenton Reactors as a New Class of Oxidative Stress Amplifying Anticancer Therapeutic Agents
Kwon, Byeongsu,Han, Eunji,Yang, Wonseok,Cho, Wooram,Yoo, Wooyoung,Hwang, Junyeon,Kwon, Byoung-Mog,Lee, Dongwon American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.9
<P>Cancer cells, compared to normal cells, are under oxidative stress associated with an elevated level of reactive oxygen species (ROS) and are more vulnerable to oxidative stress induced by ROS generating agents. Thus, manipulation of the ROS level provides a logical approach to kill cancer cells preferentially, without significant toxicity to normal cells, and great efforts have been dedicated to the development of strategies to induce cytotoxic oxidative stress for cancer treatment. Fenton reaction is an important biological reaction in which irons convert hydrogen peroxide (H2O2) to highly toxic hydroxyl radicals that escalate ROS stress. Here, we report Fenton reaction-performing polymer (PolyCAFe) micelles as a new class of ROS-manipulating anticancer therapeutic agents. Amphiphilic PolyCAFe incorporates H2O2-generating benzoyloxycinnamaldehyde and iron-containing compounds in its backbone and self-assembles to form micelles that serve as Nano-Fenton reactors to generate cytotoxic hydroxyl radicals, killing cancer cells preferentially. When intravenously injected, PolyCAFe micelles could accumulate in tumors preferentially to remarkably suppress tumor growth, without toxicity to normal tissues. This study demonstrates the tremendous translatable potential of Nano-Fenton reactors as a new class of anticancer drugs.</P>
공기업 CEO의 출신배경이 정책기여도 및 업무효율성에 미치는 영향: 정부권장정책 및 업무효율 점수를 중심으로
김병수 ( Kim Byeongsu ) 한국거버넌스학회 2017 한국거버넌스학회보 Vol.24 No.2
본 연구는 공기업 CEO의 출신배경이 공기업의 정책기여도와 업무효율성에 어떠한 영향을 미치는 지를 실증 분석하였다. 본 연구의 조사 대상은 공기업으로 지정된 27개 기관이며 총 표본 수는 108개였다. 분석 대상 연도 범위는 2011년부터 2014년까지 4개 연도였다. 그 결과 내부승진 출신 CEO에 비하여 정치인 및 민간 출신 CEO들의 정부권장정책 점수가 더 낮았으며, 그 가운데 정치인 출신 CEO의 점수가 가장 낮았다. 특히 정치인 출신 CEO는 임기가 지날수록 정부권장정책 점수가 감소하는 경향이 나타났다. 또한 내부승진 출신 CEO에 비하여 정치인, 관료 출신 CEO가 소속된 공기업의 업무효율 점수가 더 낮았고, 정부권장정책 점수 경우와 마찬가지로 정치인 출신 CEO가 가장 낮은 점수를 보였다. 이를 통하여 내부승진 출신 CEO가 타 출신 CEO에 비하여 높은 정책기여도와 업무효율성을 달성한 반면, 정치인 출신 CEO는 타 출신에 비해 정책기여도와 업무효율성 모두 가장 낮은 성과를 보였음을 확인하였다. 이 같은 연구 결과는 공기업 CEO 인선 시 정밀한 자질 검증이 필요함을 시사한다. This article analyzes the impact of a career background of the CEO of state-owned companies on the level of policy contribution and work efficiency. The background of the CEOs is classified into an insider, a politician, a public administrative officer, and a private worker according to their career. The level of policy contribution is measured by the score of `Policy enforced by the government` in the management performance assessment of the state-owned companies for 2011 - 2014. The level of work efficiency is measured by the score of `Work Efficiency` in the in the management performance assessment of the state-owned companies for 2011 - 2014. This article takes CEO`s term, history of the state-owned company, debt-to-asset ratio, the number of employees, the amount of the asset into consideration for control variables. Year and companies are also considered for the fixed effect. The research subjects of this article are 27 state-owned companies in Korea for 4 years(the total number of observation is 108). The conclusion of the analysis is as following. The score of `Policy enforced by the government` from the CEOs having political or private work experience is inferior to that of it from the CEOs who are promoted in the inside. The CEOs from the politic background have the lowest performances on policy contribution. Especially, the score of `Policy enforced by the government` from the CEOs who have political background is getting worse as the CEOs` term increases. Similarly, The score of `Work Efficiency` from the CEOs who were politicians or public administrative officers work experience is inferior to that of it from the CEOs who are promoted in the inside. The CEOs from the politic background also have the lowest performances on work efficiency.