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프로토콜 역설계를 이용한 전자전시험장비 제어 및 신호분석 소프트웨어 개발
정인화,Jung, In-Hwa 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.3
In this paper, we have proposed a method and procedure which can find out the unknown network protocol. Although it seems to be difficult to identify the protocol, we can find out the rule in the packet according to the method we have proposed. We have to recognize functions of the system and make the list of events first. Then we capture the network packet whenever the event are occurred. The captured packets are examined by means of the method that is finding repeated parts, changed parts according to the input value, fixed parts and changed parts according to regular rules. Finally we make the test program to verify the protocol. We applied this method and procedure to upgrade Electronic Warfare Test System which is operated by ADD. We have briefly described the redesign of control and analysis software for Electronic Warfare Test System
리튬이차전지용 Ti-Si 합금 음극활물질 제조 및 전기화학적 특성
정인화(In-Hwa Jung) 산업기술교육훈련학회 2017 산업기술연구논문지 (JITR) Vol.22 No.1
Ti-Si alloys are synthesized by mechanical alloying method and their electrochemical properties as anode materials for lithium ion batteries are investigate. The mechanically alloyed Ti-Si samples consist of active Si and inactive TiSi 2 phases. The electrochemical performance of Ti-Si alloys are dependent on the alloy composition of Ti/Si ratio, attributable to the ratio of active/inactive phases. With increasing the active Si phase, the cycle performance is getting worse, while the reversible charge capacity increases. The poor cycle performance with high Si phase is attributed to the electrical disconnection between active material particles or between active material particles and current collector and SEI film regeneration on the surface of Ti-Si alloy particles during cycling.
볼 밀링 방법으로 제조된 리튬이차전지 음극용 Si/Carbon 복합물질의 전기화학적 특성 평가
정인화(In-Hwa Jung),김영래(Young-Lae Kim) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
Recently, Si/Carbon composite have been suggested as a promising anode material for lithium batteries. In this study, nano-Si/graphite composites are fabricated by a ball milling method in Ar atmosphere. Every sample was fabricated by controlling milling time, respectively. Their electrochemical characteristics as anode materials for lithium secondary batteries were investigated. Si particles are uniformly distributed throughout the nano-Si/graphite composite fabricated by ball milling. The fabricated nano-Si/graphite composite electrodes show improved cycle performance, but a large initial irreversible capacity.
정인화(Jung, In-Hwa) 관동대학교 인문과학연구소 2013 人文學硏究 Vol.18 No.-
사람은 왜 기를 쓰고 사랑하는가? 이 질문은 고대 그리스 철학자들의 본질적 질문이었다. 본 논문은 플라톤의 〈향연〉을 중심으로 사랑의 본질을 분석한다. 사랑의 본질로 본 글에서는 네 가지 -이브의 천형, 제우스의 형벌, 오비디우스의 사랑의 불씨(semina), 그리고 큐피드의 화살-을 설명한다. 이 글에서는 사랑의 종류로 천상의 사랑과 세속의 사랑이 본질적으로 어떤 차이가 있는지를 다룬다. 이 글에서는 사랑의 특징으로 공정성, 고통과 예술적 열정, 풍요와 결핍, 잉태를 든다. 그리고 동성애의 신화적 기원을 설명한다. This paper is to answer the basic question of human being;why man are to love? This question has been questioned for more than 2,000 years. The approach to this question in this paper begins from the greek classic ‘Symposium’ written by Plato. Why man are so eager for love? What is the fundermental elements of love? The author analyze the essences of love with four catagories: the fatal destiny of Eve’s love for man, the punishment of Zeus for the pride of man, ‘semina’ of Ovidius the Roman poet, and woman and the arrow of Cupid. This paper in turn talks about the combination of Eros. the secularlove and sacred love. This paper analyzes the characteristics of love as ‘fairness’, pain and artistic zest, abundance and scarcity, and pregnance. Finally, the mythical explanation of homosexuality is presented.
기계적 합금화방법을 이용한 Sn-P 화합물의 합성 및 전기화학적 특성 평가
정인화(In-Hwa Jung),김영래(Young-Lae Kim) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.1
Recently, Sn-P compounds have been suggested as a promising anode material for lithium batteries. In this study, Sn-P compounds are synthesized by a mechanical alloying method. Every sample was fabricated by controlling milling time and milling intensity, respectively. Sn3P4 compound was obtained by a mechanical alloying method, but there was a limit to fabricate SnP0.94 compound by using a mechanical alloying method. There is little difference in phase formation as milling condition. The fabricated Sn-P compound electrodes show a large initial discharge/charge capacity, but poor cycle performance.
양 모서리 효과에 의한 유회수기를 이용한 디젤유 회수에 관한 실험적 연구
정송환(Song-hwan Jung),정인화(In-hwa Jung) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.4
Generally we have difficulty in removing oil using mechanical devices because recovery rate and recovery efficiency decrease remarkable when operating in thin oil films or in oils of very high viscosity. In the present study a series of experiments were carried out to study the effect of operating conditions on the rate of recovery for the spilled oil using both edge effect a drum skimmer. For each set of experiments depth of immersion, oil film thickness and the circumferential speeds were varied systematically to find the effects on the recovery rate. The results shows that recovery rate is dependent on the contact angle for the depth of immersion and the highest rate of oil recovery shows in the case of a contact angle of 45 〫(ℎ/d=0.15) For the removal of spilled oil the optimal circumferential speed can be found as the critical value to reach the saturated recovery rate for a given oil film thickness and depth of immersion. Even in thin oil thickness we have enough recovery rate and recovery efficiency within critical circumferential speed this way.
거제도 해양의 여름 및 겨울철 환경에서 거리에 따른 대기투과도를 고려한 함정의 적외선 신호 특성 분석
최준혁,김정호,정인화,이필호,김태국,Choi, Jun-Hyuk,Kim, Jung-Ho,Jung, In-Hwa,Lee, Phil-Ho,Kim, Tae-Kuk 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.2
The IR signature data of a ship is mainly affected by location, meteorological conditions(atmosphere temperature, wind direction and velocity, humidity etc.), atmospheric transmittance, solar position and ship surface temperature etc. The IR signatures received by a remote sensor at a given temperature and wavelength region is consisted of the self-emitted component directly from the object surface, the reflected component of the solar irradiation at the object surface, and the scattered component by the atmosphere without ever reaching the object surface. Computer simulations for prediction of the IR signatures of ships are very useful to examine the effects of various sensor positions. In this paper, we have acquired the IR signature for different sensor positions by using computer program for prediction of the IR signatures. The numerical results show that the IR signature contrast as compared to the background sea considering the meteorological conditions, solar and sky irradiations.