포화상태에 놓인 C-Type 액체수소 탱크의 슬로싱이 열 유속과 BOG에 미치는 변화의 수치적 분석

이진호,황세윤,이성제,이장현,Lee, Jin-Ho,Hwang, Se-Yun,Lee, Sung-Je,Lee, Jang Hyun 한국전산구조공학회 2022 한국전산구조공학회논문집 Vol.35 No.5

This study was conducted to predict the tendency for heat exchange and boil-off gas (BOG) in a liquefied hydrogen tank under sloshing excitation. First, athe fluid domain excited by sloshing was modeled using a multiphase-thermal flow domain in which liquid hydrogen and hydrogen gas are in the saturated state. Both the the volume of fluid (VOF) and Eulerian-based multi-phase flow methods were applied to validate the accuracy of the pressure prediction. Second, it was indirectly shown that the fluid velocity prediction could be accurate by comparing the free surface and impact pressure from the computational fluid dynamics with those from the experimental results. Thereafter, the heat ingress from the external convective heat flux was reflected on the outer surfaces of the hydrogen tank. Eulerian-based multiphase-heat flow analysis was performed for a two-dimensional Type-C cylindrical hydrogen tank under rotational sloshing motion, and an inflation technique was applied to transform the fluid domain into a computational grid model. The heat exchange and heat flux in the hydrogen liquid-gas mixture were calculated throughout the analysis,, whereas the mass transfer and vaporization models were excluded to account for the pure heat exchange between the liquid and gas in the saturated state. In addition, forced convective heat transfer by sloshing on the inner wall of the tank was not reflected so that the heat exchange in the multiphase flow of liquid and gas could only be considered. Finally, the effect of sloshing on the amount of heat exchange between liquid and gas hydrogen was discussed. Considering the heat ingress into liquid hydrogen according to the presence/absence of a sloshing excitation, the amount of heat flux and BOG were discussed for each filling ratio.

다층 대공방어 체계의 신뢰도 향상을 위한 네트워크 모델 기반의 최적 투자 계획 모델

이진호,정석문,Lee, Jinho,Chung, Suk-Moon 한국시뮬레이션학회 2017 한국시뮬레이션학회 논문지 Vol.26 No.3

This study considers an optimal investment planning for improving survivability from an air threat in the layered air defense system. To establish an optimization model, we first represent the layered air defense system as a network model, and then, present two optimization models minimizing the failure probability of counteracting an air threat subject to budget limitation, in which one deals with whether to invest and the other enables continuous investment on the subset of nodes. Nonlinear objective functions are linearized using log function, and we suggest dynamic programming algorithm and linear programing for solving the proposed models. After designing a layered air defense system based on a virtual scenario, we solve the two optimization problems and analyze the corresponding optimal solutions. This provides necessity and an approach for an effective investment planning of the layered air defense system.

K2소총의 사격음 차폐장치에 관한 실험적 연구

이진호,Lee, Jin-Ho 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3

This paper studies an experimental analysis of the impulse noise of K2 rifle when its bullet passes through the large tube(length 1.84m, outer diameter 50cm, glass wool & steel). In experiment, the characteristics of the sound of shooting were different according to the way of shooting; the results of the experiment are given below. First of all, the shooting sound was lower in single-shot shooting, when compared to 3rds burst-shot shooting, difference averaging 2.8dB, 4.0dB at maximum. In short, the difference is minuscule. Secondly, the sound of the K2 rifle was diminished when shot in a tube, ranging from 2.7dB to 15.4dB, averaging 8.2dB. Thirdly, the shooting sound of the K2 rifle was diminished as the insertion depth deepened with formulas given in Fig. 5, 6. Fourthly, basic data for excluding sound of the shooting were presented. Lastly, the characteristics of the shooting sound could be equally used as a basic material for developing marksmanship and sharp-shooting detection device.

우리나라 Key Board 산업동향

이진호,Lee, Jin-Ho 한국전자정보통신산업진흥회 1997 電子振興 Vol.17 No.4

액상환원공정을 이용한 백금 나노 입자의 합성

이진호,김세훈,김진우,이민하,김영도,Lee, Jin-Ho,Kim, Se-Hoon,Kim, Jin-Woo,Lee, Min-Ha,Kim, Young-Do 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.1

In this study, Platinum(Pt) nanoparticles were synthesized by using polyol process which is one of the liquid phase reduction methods. Dihydrogen hexachloroplatinate (IV) hexahydrate $(H_2PtCl_6{\cdot}6H_2O)$, as a precursor, was dissolved in ethylene glycol and silver nitrate ($AgNO_3$) was added as metal salt for shape control of Pt particle. Also, polyvinylpyrrolidone (PVP), as capping agent, was added to reduce the size of particle and to separate the particles. The size of Pt nanoparticles was evaluated particle size analyzer (PSA). The size and morphology of Pt nanoparticles were observed by transmission electron microscopy (TEM) and high resolution TEM (HRTEM). Synthesized Pt nanoparticles were studied with varying time and temperature of polyol process. Pt nanoparticles have been successfully synthesized with controlled sizes in the range 5-10 and 20-40 nm with cube and multiple-cube shapes.

휜 형상에 따른 증발기의 전열 성능

이진호,권오갑,Lee, Jin Ho,Kwon, O Kap 대한설비공학회 1990 설비공학 논문집 Vol.2 No.1

An experimental investigation was made to study the performance characteristics of evaporator having different fin configurations and tube inner grooves. Three different types of fin such as super slitted fin, slitted fin, plain fin, and two types of tube such as inner grooved tube, and bare tube, are tested varying the air velocity, evaporation temperature and superheat of refrigerant. Results show that in the range of air side Reynolds number $3{\times}10^3\;-\;1.5{\times}10^4$ evaporator with super slitted fin and inner grooved tube shows best performance. It is 80% higher in overall heat transfer coefficient and 2.6 times higher in pressure loss compared to that with plain fin inner grooved tube. Friction factor is found to be almost independent of evaporating temperature and degree of superheat, while Colburn j factor varies with evaporating temperature.

화이트바이오텍기반 방향족화합물 개발에 관한 연구동향

이진호,Lee, Jin-Ho 한국미생물·생명공학회 2009 한국미생물·생명공학회지 Vol.25 No.4

원유의 고갈, 반복되는 에너지 위기 및 지구온난화 문제에 기인하여 석유 대신 재생가능한 바이오매스를 사용하여 방향족 화학원료를 개발하는 연구가 광범위하게 진행되고 있다. 특히, 바이오테크놀로지를 이용한 포도당으로부터 방향족아미노산 생합성경로 중간대사체 및 그 유도체 합성기술은 벤젠유래 화합물을 포함한 많은 방향족 석유화학원료를 대체할 가능성이 있는 기술들이 개발되고 있다. 본 고는 미생물 대사공학, 생물전환, 화학공정 기술을 이용하여 hydroquinone, catechol, adipic acid, shikimic acid, gallic acid, pyrogallol, vanillin, p-hydroxycinnamic acid, p-hydroxystyrene, p-hydroxybenzoic acid, indigo, indole 3-acetic acid와 같은 방향족화합물을 어떻게 개발하고 있는지를 논하였다. 또한, 경쟁력있는 화이트바이오텍기반 방향족화합물 생산기술을 개발하기 위한 문제점 및 해결방안등을 논했다. Due to the depleting petroleum reserve, recurring energy crisis, and global warming, it is necessary to study the development of white biotech-based aromatic chemical feedstock from renewable biomass for replacing petroleum-based one. In particular, the production of aromatic intermediates and derivatives in biosynthetic pathway of aromatic amino acids from glucose might be replaced by the production of petrochemical-based aromatic chemical feedstock including benzene-derived aromatic compounds. In this review, I briefly described the production technology for hydroquinone, catechol, adipic acid, shikimic acid, gallic acid, pyrogallol, vanillin, p-hydroxycinnamic acid, p-hydroxystyrene, p-hydroxybenzoic acid, indigo, and indole 3-acetic acid using metabolic engineering, bioconversion, and chemical process. The problems and possible solutions regarding development of production technology for competitive white biotech-based aromatic compounds were also discussed.

외표면 형상이 원관의 응축열전달에 미치는 영향

이진호,남임우,Lee, Jin Ho,Nam, Leem Woo 대한설비공학회 1988 설비저널 Vol.17 No.3

An experiment was carried out to study the condensation heat transfer enhancement of horizontal circular cylinders with varying outside surface configurations. The refrigerant used is Freon-22 and the test condensing temperature is 34.1C. Pin-finned tube shows about 2.5-3.5 times higher overall heat transfer coefficient compared to that of smooth surface tube, thus has larger encomic benifit for condenser design. The condensation heat transfer coefficient was shown to increase as the fin-pitch of the pin-finned tube decreases for film Reynolds number larger than 100.

Cardiac Hematoma with Pericardial Effusion in a Dog

이진호,정태호,윤성태,김성현,김민수,박철,Lee, Jin-Ho,Chung, Tae-Ho,Yoon, Sung-Tae,Kim, Seong-hyun,Kim, Min-Su,Park, Chul The Korean Society of Veterinary Clinics 2015 한국임상수의학회지 Vol.7 No.2

A 12-year-old spayed female, Golden Retriever presented with dyspnea and lethargy of 3 months duration. Pericardial effusion and cardiac mass were identified on echocardiography. Pericardiectomy and mass resection were performed for treatment of pericardial effusion and histopathological analysis was conducted for the definitive diagnosis. The mass was diagnosed as hematoma with mainly erythrocyte, fibrin and many of neutrophils based on microscopic description. Severe purulent pericarditis thickened by inflammatory cells and reactive fibrous tissue were identified, but not diagnosed as neoplasm. This is the first case report in veterinary literature of a dog with pericardial effusion caused by cardiac hematoma. 12년령의 중성화한 암컷 골든레트리버가 3개월간의 호흡곤란과 기력저하를 주호소로 내원하였다. 심낭삼출물과 심장부위의 종괴가 심장초음파 상에서 확인되었다. 심낭절제술과 종괴 제거가 이루어졌으며 확진을 위해 조직검사를 수행하였다. 종괴는 현미경 검사 상에서 적혈구와 피브린, 호중구로 이루어진 혈종임이 확인되었다. 염증세포와 반응성 섬유 조직에 의해 두꺼워진 중증의 화농성 심낭염 소견이 확인되었으며, 종양 소견은 관찰되지 않았다. 이 증례는 수의학에서 개의 심장혈종에 의한 심낭삼출물 발생의 최초 보고이다.

수학과 개정교육과정과 대학수학능력시험 체제 개편에 관한 고찰

이진호,Lee, Jin-Ho 한국수학사학회 2009 Journal for history of mathematics Vol.22 No.1

In this paper we check over some problems in College Scholastic Ability Test(CSAT) Mathematics section and propose some methods to improve the CSAT Mathematics section. CSAT has been changed several times with the change of the school curriculum. A Mathematics amended curriculum will apply in 2009 and we have to reorganize the system of CSAT. We investigate the changes in school curriculum and system of CSAT. Also we make a comparative study of the range of possible questions of CSAT with those of SAT and foreign national entrance exam for college.