미세 기포 발생용 소형 공기 압축기 개발

강기중,박주용,이기만 한국기계기술학회 2010 한국기계기술학회지 Vol.12 No.4

Effects of fuel composition and exhaust gas recirculation on ignition delay characteristics of n-heptane/hydrogen blended fuel

강기중,심태영,오채호,최경민,김덕줄 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.3

The autoignition characteristics of n-heptane/hydrogen were investigated numerically. The effects of the temperature, fuel compositions and Exhaust gas recirculation (EGR) on the autoignition characteristics were evaluated. The numerical study on the ignition delay time was performed using the CHEMKIN-PRO software to calculate ignition delay time and predict the chemical species in the combustion process. The results revealed that ignition delay time decreased with an increase in the hydrogen fraction in the mixture in low temperature regime, but the opposite behavior observed in high temperature regime. The oxidation reaction of n-heptane in low temperature regime is limited with increasing mole fraction of hydrogen in blended fuel. Thus, cool flame which is characteristics of n-heptane is weakened. As consumption rate of n-heptane and temperature are decreased, total reactivity is decreased. The ignition delay time sharply decrease with EGR due to intermediate species in the exhaust gas.

급속압축기에서 노말헵탄/노말부탄올 혼합연료의 점화지연 특성에 배기가스 재순환이 미치는 영향

강기중 한국기계기술학회 2017 한국기계기술학회지 Vol.19 No.6

The autoignition characteristics of n-heptane/n-butanol were investigated both experimentally and numerically. The effects of oxygen concentration and exhaust gas recirculation rate on the autoignition characteristics were evaluated. A rapid compression machine was employed to measure ignition delay times of blended fuels. A numerical study on the ignition delay time was performed using the CHEMKIN-PRO software to calculate ignition delay time and predict the chemical species in the combustion process. The results revealed that the ignition delay time increased with decreasing oxygen concentration due to the thermal load effect of nitrogen. The oxidation reaction of n-heptane in a low temperature regime was limited with decreasing oxygen concentration. The ignition delay time sharply decreased with exhaust gas recirculation because of theintermediate species in the exhaust gas. Exhaust gas recirculation reduced first ignition delay dramatically. However, the time interval between the first and main ignition increased with increased exhaust gas recirculation.

Effect of exhaust gas recirculation on ignition characteristics of n-heptane/ethanol blend fuels in rapid compression machine

강기중,오채호,심태영,송재혁,류승협,최경민,김덕줄 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.7

The autoignition characteristics of n-heptane/ethanol were investigated both experimentally and numerically. The effects of nitrogen dilution and exhaust gas recirculation on the autoignition characteristics were evaluated. A rapid compression machine was employed to measure ignition delay times of blended fuels. A numerical study on the ignition delay time was performed using the CHEMKIN-PRO software to calculate ignition delay time and predict the chemical species in the combustion process. The results revealed that the ignition delay time increased with increasing nitrogen dilution rate due to the thermal load effect of nitrogen. The oxidation reaction of n-heptane in a low temperature regime was limited with increasing nitrogen dilution rate. The ignition delay time sharply decreased with exhaust gas recirculation because of the intermediate species in the exhaust gas. Exhaust gas recirculation reduced first ignition delay dramatically. However, the time interval between the first and main ignition increased with increased exhaust gas recirculation.

A Study on the Heat Transfer Characteristics of a High Velocity Impinging Inverse Diffusion Flames

강기중,박주용,이기만 한국기계기술학회 2010 한국기계기술학회지 Vol.12 No.4

Experimental measurements of flame shape and heat transfer characteristics were performed for impinged inverse diffusion flame(IDF) using propane as a fuel. The purpose of this study is to identify the favorable co-axial inverse diffusion flame structure for impingement heating. The flame consisted of an entrainment zone and mixing and combustion zone. The heat flux which represents heat transfer rate is measured by using a heat flux sensor that is located at the center of the impingement plate. The inverse diffusion flame structure has been classified into six modes. In these modes, several favorable flames for impingement heating were identified. In this study, the parameters are overall equivalent ratio(Φ), nozzle to impingement plate distance(h/d), vertical distance from the stagnation point and Reynolds number(Re) of combustion air.

부작위 사기죄와 관련한 형법 도그마틱 - 비의무범적 재산범죄인 사기죄에서의 고지의무를 중심으로 -

강기중,안정빈 조선대학교 법학연구원 2023 法學論叢 Vol.30 No.1

In the case of fraud, deception is an objective component, but its content and scope are not easily predictable. Jurisprudence expands the scope of deception by stating that all acts that are contrary to the good faith and sincerity are included in its scope. In discussing the establishment of the fraud by omission, precedents and theories that seek the basis for the duty to act in the principle of good faith are being criticized a lot. It is understandable that it is a realistic limitation that it is impossible to make all the circumstances and contents of the obligation to act as a component. Article 18 of the Criminal Law needs to be specified as a provision corresponding to the fulfillment of the elements of omission and the need for legislation to add a provision for arbitrarily reducing the penalty according to the degree of illegality of the omission. The jurisprudence suggests as a criterion for judging whether the duty to inform is violated or not. The principle of good faith and sincerity is abstract and ambiguous regulation. There have been many changes in the real estate transaction situation these days compared to the past. In consideration of the changed real estate transaction, whether the party acknowledges the violation of the duty to inform must be applied and interpreted differently. In this regard, this paper presents the opinion that a limited determination of fraud by omission should be made in consideration of the duty to inform and the duty of confirmation of the other party as well. Eventually, fraud by omission must be limitedly convicted.

컨테이너선의 적재계량에 관한 연구

강기중,이철영 한국항해항만학회 1990 한국항해학회지 Vol.14 No.4

With increasing ship's speed turnround and port time becomes a large percentage of total roundtrip time and this causes to accelerate the introduction of the various kind of modern handling equipment, the standardization of cargoes, and the improvement of the ship. However, it is still a drag on efficient operation of ship. Similarly, the turnround time at the container port is very important as a measure for the decision of the efficiency of port. To decrease operating coasts, the minimization of the time need to cargo handling at the ports of call must be achieved. Thus the optimization of the time need to cargo handling at the ports of call must be achieved. Thus the optimized Container Loading Plan is necessary, especially under the rapid speed of container operations. For the container loading plan, in this thesis, we use the hungarian method and the branch and bound method to get the initial disposition of both maximization of ship's GM and minimization of shift number to the obstructive container in a yard area. We apply the dynamic programming algorithm to get the final disposition for minimizing total turnroudn time and finally we analyzed the results to check whether the initial disposition is proper or not.

도메인 이름에 관한 2개의 판례 비교 해설

강기중(Kang Ki joong) 한국정보법학회 2004 정보법학 Vol.8 No.2

1. Using someone else’s famous mark as a registered domain name in a commercial website is unfair competition as defined in Article 2 Item 1 (da)Mok(다. 목??) of Unfair Competition Prevention and Trade Secret Protection Act. 2. The domain name “viagra.co.kr” has been used in a commercial website, so the owner of famous mrak ‘viagra’ has the right to petition for cancelling the registration of that domain name according to Unfair Competition Prevention and Trade Secret Protection Act. But the domain name “rolls-royce.co.kr” was used in a private non-commercial website, so the petition of the owner of famous mark “rollsroyce” was dismissed. [1] 저명한 상품표지 또는 영업표지를 도메인 이름으로 등록하여 영업적으로 사용하는 행위는 부정경쟁방지및영업비밀보호법 제2조 제1호 (다)목의 부정경쟁행위에 해당한다. [2] viagra.co.kr의 도메인 이름 등록사용은 영업적 사용에 해당한다고 보았지만, rollsroyce.co.ke 도메인 이름 등록사용은 영업적 사용에 해당하지 않는다고 봄에 따라 앞의 사건의 상품표지 보유자에게만 도메인이름의 등록말소 청구를 인용하여 준 사례

컴퓨터프로그램 저작권의 양도와 개작권에 관한 사례연구

강기중(Kang Ki joong) 한국정보법학회 2003 정보법학 Vol.7 No.2

[1] 프로그램저작권을 양수한 자는 그 이전을 등록하지 않더라도 그 침해자에 대하여 프로그램저작권자로서의 권한을 행사할 수 있는지 여부(적극) 및 원 프로그램을 개작한 2차적 프로그램의 저작권의 귀속관계 [2] 원 프로그램의 저작권은 개발업자가 원시취득하였지만 프로그램개발용역계약의 내용에 의하여 원 프로그램의 저작권이 발주자에게 양도되어 원 프로그램의 저작권과 발주자가 원 프로그램을 개작한 2차적 프로그램의 저작권은 모두 발주자에게 귀속한다고 본 사례

An Experimental Study on the Flame Appearance and Heat Transfer Characteristics of Acoustically Excited Impinging Inverse Diffusion Flames

강기중(Kang, Ki-Joong),이기만(Lee, Kee-Man) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.10

본 오디오 스피커로 음향 가진과 비가진 된 충돌 역 확산화염에서 화염의 형상과 열전달 특성에 관한 실험 적 연구를 수행하였다. 가진에 의해 화염은 반응대가 넓어지고 화염 길이는 좀 더 짧아지는 경향을 보이며 충돌판의 정체점에서 열전달 성능인 열유속은 가진에 의해 향상되는 것으로 나타났다. 이러한 가진 효과는 당량비가 높은 과농 한 상태 보다 상대적으로 낮은 혼합 상태에서 효과적으로 영향을 미치는 것으로 파악되는데 이는 가진에 의해 주위 산화제가 연료 분류로의 유입이 향상되어 나타나는 것으로 판단된다. 이러한 현상으로 본 연구에서는 당량비가 0.8인 경우 정체점에서 총 열유속이 최대 57% 증가되는 것으로 나타났다. 따라서 본 연구를 통해 가진 연소가 충돌 분류 화염에서 열전달 성능을 향상시키는데 효과적인 방법임을 확인하게 되었다. An experimental investigation of the flame appearance and heat transfer characteristics in both unexcited and excited impinging inverse diffusion flames with a loud speaker has been performed. The flame is found to become broader and shorter (in length) with acoustic excitation. The heat flux at the stagnation point is increased with the acoustic excitation. The acoustic excitation is more effective in lean conditions than in rich conditions. The reasons for these behaviors are that acoustic excitation improves the entrainment of surrounding air into the jet. From this study, it is found that the maximum increase of 57% in the total heat flux is obtained at the stagnation point of Φ=0.8. Therefore, it is ascertained that the excitation combustion can be adopted with effective instruments as a method for improving heat transfer in impinging jet flames.