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멤브레인 LNG선 방열재료 관한 극저온에서의 열탄성 거동 연구
장철웅,송창용,심천식,송하철 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.11
In the context of structural performance on LNG hold, the mechanical characteristics of insulation material are considered a critical design factor under a cryogenic temperature. This paper presents the thermo-elastic behavior of the reinforced polyurethane foam (RPUF) adapted for the insulation material of membrane type LNG carrier via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the characteristics for thermal transfer and static compressive deformation on the actual RPUF specimen. The heat transfer simulations based on finite element method (FEM) include forced convection analysis. The heat transfer results are mapped on structural analysis model to carry out thermal coupled analyses. Thermo-elastic behaviors estimated by simulations are compared to experimental results.
근세 일본 지방행정조직의 구조: 오카야마번(岡山藩)의 군카이쇼(郡會所)사례 연구
정하영(Hayoung Choung) 서울대학교 아시아연구소 2021 아시아리뷰 Vol.11 No.1
본고는 오카야마번의 군카이쇼를 통해 근세일본의 지방행정조직의 구조를 분석하였다. 군다이(郡代)와 고오리부교(郡奉行) 등의 임명과 승진 등은 기본적으로 가격(家格)에 따라 이루어졌다. 번은 부정부패 방지 혹은 햐쿠쇼(百姓)를 보호(혹은 지배)하기 위해, 고오리부교 등 지카타야쿠닌(地方役人)을 조카마치(城下町)에 거주하게 하고, 또한 순회 및 출장을 제한시키고, 군메쓰케(郡目付)의 감시와 감찰기능을 강화시켰다. 이런 제도는 부패와 유착을 방지하는 데 어느 정도 긍정적인 측면이 있었지만, 담당 군에 대한 기본적 지식과 햐쿠쇼의 실상에 대한 무지, 소극적인 행정, 역직의 이권화와 부정부패가 생겨났다. 이런 부정적인 현상은 무라야쿠닌(村役人) 및 봉공인(奉公人) 사이에서도 마찬가지로 나타났다. 다른 한편, 가치(徒) 및 하급(혹은 신참) 헤이시(平士)들은 가격 중시와 후다이(譜代) 등의 역직과 경제력 독점 및 그들의 생활습관에 대해 반감을 갖고 비판을 가했다. This article analyzes the structure of the regional administration in Earlymodern Japan through the organization of the Okayama Domain. Gundai and Koribugyo (magistrate of a country) are appointed and promoted according to the family status. In order to prevent corruption of officials and to protect (or dominate) farmers, the domain government has allowed local officials to live in castle towns, restricted their touring and business trips, and monitored and supervised them through controlling the superintendent officer of the district. In spite of having these systems to prevent corruption and collusion, officials still do not possess the basic understanding of the county and the sufferings of the local peasants under such circumstances. So, they performed negatively in the administration. Consequently, this encouraged more corruption when the officials were seeking higher positions. There were no exceptions for the village officers and servants of samurai. On the other hand, Kachi (Foot Guards) and lower-ranking warriors were not satisfied. They criticized the culture of over-dependence to the family status, the monopoly of official positions, the economic power by the higher-ranking samurai (Fudai), and the dominance over their lives.
멤브레인 LNG 선박용 강화 폴리우레탄폼의 극저온 거동 연구
장철웅(Cheol-Woong Jang),심천식(Chun-Sik Shim),송하철(Ha-Cheol Song),송창용(Chang Yong Song) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.1
In the context of the structural performance of an LNG hold, the mechanical characteristics of the insulation material are considered to be a critical design factor under cryogenic temperatures. This paper presents the thermal elasto-plastic behavior of the reinforced polyurethane foam(RPUF) adapted for the insulation material of a membrane type LNG carried via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the thermal transfer and thermal elasto-plastic deformation characteristics of an actual RPUE specimen. The heat transfer simulations based on the finite element method(FEM) include a forced convection analysis. The results of heat transfer analyses are compared with the experimental results. Reasonable cryogenic conditions for RPUF are reviewed based on both the analysis and experimental results.
극저온 실험 및 해석 기반 LNG 운반선 용 강화 폴리우레탄의 기계적 특성 평가
장철웅(Cheol-Woong Jang),심천식(Chun-Sik Shim),송하철(Ha-Cheol Song),송창용(Chang Yong Song) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
In the context of structural performance on LNG hold, the mechanical characteristics of insulation material are considered a critical design factor under a cryogenic temperature. This paper presents the thermo-elastic behavior of the reinforced polyurethane foam (RPUF) adapted for the insulation material of membrane type LNG carrier via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the characteristics for thermal transfer and static compressive deformation on the actual RPUF specimen. The heat transfer simulations based on finite element method (FEM) include forced convection analysis. The heat transfer results are mapped on structural analysis model to carry out thermal coupled analysis. Thermo-elastic behaviors estimated by simulations are compared to experimental results.
극저온 실험 및 해석 기반 LNG 운반선 용 강화 폴리우레탄의 기계적 특성 평가
장철웅(Cheol-Woong Jang),심천식(Chun-Sik Shim),송하철(Ha-Cheol Song),송창용(Chang Yong Song) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.5
In the context of structural performance on LNG hold, the mechanical characteristics of insulation material are considered a critical design factor under a cryogenic temperature. This paper presents the themo-elastic behavior of the reinforced polyurethane foam (RPUF) adapted for the insulation material of membrane type LNG earner via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the characteristics for thermal transfer and static compressive deformation on the actual RPUF specimen. The heat transfer simulations based on finite element method (FEW include forced convection analysis. The heat transfer results are mapped on structural analysis model to carry out thermal coupled analysis. Thermo-elastic behaviors estimated by simulations are compared to experimental results.
삼각측량법을 이용한 적외선 거리측정 시스템에 관한 연구
장철웅(Chul-Woong Jang),정기호(Ki-Ho Jung),이웅혁(Eung-Hyuk Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we realized a PSD(position sensitive detector) distance measuring system using a infrared. The measuring method of system is triangulation. The optical device of system consists of a infrared LED and a PSD receiver. It is used lens to improve a quality of light. The signal processor of system amplify a small output of PSD and process to convert a output into a distance. This system is detectable in the range of 2㎝ to 20㎝. We verify that it enable a precise detection regardless of reflection rate from the experiments.