조류발전 기술동향 및 개발전망

조철희,이강희,Jo, Cheol-Hui,Lee, Gang-Hui 한국전산구조공학회 2013 전산구조공학 Vol.26 No.2

Neopentyl Biphenylsulfonates와 Aryl Grignard Reagents의 Cross-Coupling 반응에 의한 비대칭 Terphenyls 합성

조철희,김인숙,박광응 한국공업화학회 2002 응용화학 Vol.6 No.2

Terphenyls and biphenyls, which are frequently found in natural products and pharmaceuticals, are famous for their biological and optical activities. We synthesized various asymmetric terphenyl derivatives in high yields by the palladium-catalyzed reaction of neopentyl 4-bromobenzenesulfonate with arylboronic acids followed by the nickel-catalyzed coupling with arylmagnesium bromides. Arenesulfonates proceeded the reaction in the presence of a nickel(0) catalyst via an overall nucleophilic aromatic substitution of the alkyloxysulfonyl group in reactions with Grignard reagents, while they did not react with a palladium catalyst at all. This reaction demonstrates that bromoarenesulfonates are plausible precursors for the preparation of asymmetric oligophenyls and other conjugated compounds.

공동주택에 건강개념인 통기시스템에 관한 연구 : 공기순환과 필로티를 중심으로 focused on the air ventilation and pilotis

조철희,이특구 한국의료복지시설학회 2004 의료·복지 건축 Vol.10 No.1

The purpose of this study is to analyze the air ventilation system in apartment houses on the air circulation and pilotis. The air ventilation system is used with the data which were obtained by the environmental health, urban climate, air pollution, ventilation path. The architectural element was pilotis concept connected with piloti ratio, position and piloti type. The summaries of this study were as follows; 1) the well-being apartment concept, 2) the heat island phenomenon, 3) the oxygen density of air, 4) the definition of ventilation path, 5) the pilotis connected with residential environment improvement. In addition, the detailed case study to the air ventilation system in apartment houses be needed.

터빈 특성을 고려한 부유식 조류발전장치의 운동성능 고찰

조철희,황수진,박홍재,김명주 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.6

Tidal current power is one of the energy sources of the ocean. Electricity can be generated by converting the flow energy of the current into the rotational energy of a turbine. Unlike tidal barrage, tidal current power does not require dams, which have a severe environmental impact. A floating-type tidal current power device can reduce the expensive support and installation cost, which usually account for approximately 41% of the total cost. It can also be deployed in relatively deep water using tensioned wires. The dynamic behavior of a floater and turbine force are coupled because the thrust and moment of the turbine affect the floater excursion, and the motion of the floater can affect the incoming speed of the flow into the turbine. To maximize the power generation and stabilize the system, the coupled motion of the floater and turbine must be extensively analyzed. However, unlike pile-fixed devices, there have been few studies involving the motion analysis of a moored-type tidal current power device. In this study, the commercial program OrcaFlex 10.1a was used for a time domain motion analysis. In addition, in-house code was used for an iterative calculation to solve the coupled problems. As a result, it was found that the maximum mooring load of 200 kN and the floater excursion of 5.5 m were increased by the turbine effect. The load that occurred on the mooring system satisfied the safety factor of 1.67 suggested by API. The optimum mooring system for the floating tidal current power device was suggested to maximize the power generation and stability of the floater.

해류 발전 기술 및 응용

조철희 대한설비공학회 2004 설비저널 Vol.33 No.10

해류 발전의 기술 동향과 특성에 대해 알아보고, HAT 방식 해류 발전 시스템의 로터에 대하여 연구한 결과를 소개한다.

CRCS : Change Request Control System

조철희,김영호,천유식 한국정보과학회 1986 한국정보과학회 학술발표논문집 Vol.13 No.1

Change Request Control System (CRCS) 은 어떤 시스팀의 개발이 완료되어 현장에 설치 운용되는 도중에 발생되는 문제점을 해결하기 위해서나, 또는 시스팀의 기능변경 및 확장을 위해서 요구되는 그 시스팀에 대한 각종 변경요구들을 종합적이고 체계적으로 관리하므로서 시스팀의 유지보수를 용이하게 하기 위한 database 시스팀이다. 본 고에서는 한국전자통신연구소에서 전전자식 교환기를 개발하는데 요구되었던 시스팀 변경사항에 대한 관리방안 도구로서 개발한 CRCC의 설계 및 구현에 관하여 기술한다.

아파트단지에서 차폐율과 건폐율이 통풍계획에 미치는 영향에 관한 연구

조철희,이특구 대한건축학회 2006 대한건축학회논문집 Vol.22 No.3

The purpose of this study is to analyze the characteristics of wind movement and air flow according to the blockage ratio and the building coverage ratio in an apartment housing. The wind velocity ratio is defined as the difference between the wind velocities at entering and at exiting the apartment housing. The layout types selected for the analysis are grid linear type, tower type and the combination of grid and linear type. The main reason for planning wind movement and flow is to increase the amount of wind flow, which can be indicated by the wind velocity within the apartment housing. With the Building coverage ratio being equal, the tower type of layout showed much greater wind velocity compared to the linear type. This study will focus on analyzing the wind velocity ratio according to the layout types. The result drawn from the analysis will served as a basic design data for the planning of wind flow and movement. The results of the wind flow and movement planning study is as the following : (1) According to the wind movement simulation, the wind velocity for tower type is higher than the linear type. (2) The wind velocity was higher for the tower type to be place in the center of the housing rather than the outskirts of the housing, and the velocity increased when the tower type was in group rather than by itself. (3) The uppering the height of the buildings led to the decrease in the building coverage ratio as well as the blockage ratio. The decrease in the ratios accordingly led to the increase in the wind velocity ratio. Ultimately, as the building coverage and the blockage ratio is smaller, the velocity ratio increases.

Secondary Growth of Sodium Type Faujasite Zeolite Layers on a Porous $\alpha-Al_2O_3$ Tube and the $CO_2/N_2$ Separation

조철희,여정구,안영수,한문희,김용하,현상훈,Cho, Churl-Hee,Yeo, Jeong-Gu,Ahn, Young-Soo,Han, Moon-Hee,Kim, Yong-Ha,Hyun, Sang-Hoon The Membrane Society of Korea 2007 멤브레인 Vol.17 No.3

다양한 재료특성(Si/Al 몰비, 두께, 구조적 불완전성)을 갖는 Na형 faujasite 제올라이트 분리층을 다공성 $\alpha$-알루미나 튜브 표면에 수열조건에서 이차성장 시키고 $CO_2/N_2$ 분리거동을 $CO_2/N_2$ 몰비가 1인 혼합기체에 대하여 $30^{\circ}C$에서 평가하였다. 수열조건 중에서 수열용액 내의 $SiO_2$ 양은 형성된 제올라이트 분리층의 재료특성에 가장 큰 영향을 주는 변수임을 확인하였다. 즉, 수열용액 내의 $SiO_2$ 양이 증가함에 따라서 형성된 제올라이트 분리층의 Si/Al 몰비, 두께, 구조적 불완전성(discontinuity)은 동시에 증가하였다. 본 논문에서는 불완전한 치밀화에 의해 잔존하는 결정립간 공극(void), GIS Na-P1 상에 의해 형성된 균열(crack) 등 구조적 불완전성이 $CO_2/N_2$ 분리에 가장 큰 영향을 주는 재료특성이며, 투과부에서의 $CO_2$ 탈착이 전체 $CO_2$ 투과의 율속단계(rate-determining step)임을 확인하였다. Sodium type faujasite(FAU) zeolite layers with diverse materials characteristics(Si/Al ratio, thickness, and structural discontinuity) were hydrothermally grown on a porous $\alpha-Al_2O_3$ tube, and then the $CO_2/N_2$ separation was evaluated at $30^{\circ}C$ for an equimolar mixture of $CO_2$ and $N_2$. Among hydrothermal conditions, $SiO_2$ content in hydrothermal solution seriously affected materials characteristics: with an increment in the $SiO_2$ content, Si/Al ratio, thickness, and structural discontinuity of grown FAU zeolite layer simultaneously increased. The present study reveals that structural discontinuity(intercrystalline voids due to an incomplete densification and cracks induced by GIS Na-P1 phase) is the most important variable affecting the $CO_2/N_2$ separation. Also, it was suggested that the $CO_2$ desorption in permeate side be the rate-determining(slowest) step in the overall $CO_2$ permeation.

해수유동 수치모의를 활용한 조류에너지잠재량 산정 연구

조철희,이강희,조봉근,황수진 한국신·재생에너지학회 2016 신재생에너지 Vol.12 No.S1

This paper describes the methodology and results of a tidal current resource assessment in Korea based on the mean surfacevelocities from tidal current observations and numerical simulations. The tidal current observation data from 1,938 measuring points wasprovided by the KHOA (Korea Hydrographic and Oceanographic Agency). A numerical simulation of ocean flow circulation in Koreawas conducted to explore the detailed distribution of tidal currents in Incheon-Gyeonggi and Jeollanam-do where there are very hightidal energy potentials and suitable sites for tidal energy farm development. The theoretical tidal current potential was calculated usingthe API (Averaged Power Intercepted) method which is generally applied in wind power potential estimation in Korea. A numericalsimulation of the flow circulation through narrow passages between the islands is very important for resource assessment study.

Nickel-Catalyzed Coupling of Arenesulfonates with Primary Alkylmagnesium Halides

조철희,Myungchul Sun,박광용 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.9

Neopentyl arenesulfonates reacted with primary alkylmagnesium halides in the presence of (PPh3)2NiCl2 to produce the corresponding alkylarenes. The efficiency of this coupling reaction considerably depends on the nature of catalyst and solvent. Highest yield was obtained by using three equivalents of Grignard reagent to a mixture of (PPh3)2NiCl2 and arenesulfonate in refluxing Et2O. This reaction represents a novel method allowing the efficient and creative substitution of sulfur-containing groups in aromatic compounds. It also shows that the alkyloxysulfonyl group might be a suitable alternative to halides and triflate in some circumstances.