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겨울철 제주연안 열수지 특성 : 강설현상 snowfall
김경보,장승민,김태희,우종규,윤용훈 濟州大學校 海洋硏究所 2004 해양과환경연구소 연구논문집 Vol.28 No.1
In other to know the characteristics of the air sea heat flux at on the coastal of Jeju Island. when there was a snowfall in winter. It is used as the basic data are Automatic Synoptic Observation System(ASOS) compiled by Jeju Regional Meteorological Office(JRMO) from 1993 to 2002, and SST data derived from National Oceanographic Research Institute(NORI) and National Fisheries Research & Development Institute(NFRDI) observations. the heat flux of the coastal of Jeju Island shows its maximum in January(latent heat flux : 35Wm^(-2) , sensible heat flux : 85Wm^(-2)), and shows its minimum in July(latent heat flux : -l3Wm^(-2), sensible heat flux : -5Wm^(-2)) the more the temperature gap between the air and SST is large and the stronger a wind is, the more it supplies the heat from the sea to the air. it shows that the north-western areas is about three times higher than other areas in Jeju Island. when fresh snow cover is 0.0∼0.9 ㎝, the mean bowen's ratio(for 1993∼2002) is 0.63∼0.67. when it is 1.0∼4.9 ㎝, the mean bowen's ratio(for 1993∼2002) is over 0.72 or more. When bowen's ratio increased upto 0.63∼0.80. fresh snow cover is increased gradually, therefore, it is researched the there is proportion between the fresh snow cover and the bowen's ratio.
점성도 개념으로 설명되는 Joule-Thomson 효과의 메카니즘
池泰求,金容圭 홍익대학교 산업기술연구소 1993 産業技術 Vol.2 No.-
A concept of the viscosity of gases has been applied to the Joule-Thomson coefficient through the variation of temperature and the pressure. We can understand easily the physical meaning that he coefficient of Joule-Thomson varies with temperature and pressure by this explanation.
DC Servo Motor를 이용한 초정밀 위치결정기구의 컴퓨터 시뮬레이션 및 제어성능 평가
박기형,김재열,윤성운,이규태,곽이구,송인석,한재호 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.6
Recently, High accuracy and precision arc required in various industrial field especially, semiconductor manufacturing apparatus, Ulna precision positioning apparatus, Information field and so on. Positioning technology is a very important one among them. As such technology has been rapidly developed, this field needs the positioning accuracy as high as submicron. It is expected that the accuracy of 10nm and 1nm is required in precision work and ultra precision work field, respectively by the beginning of 2000s. High speed and low vibration arc also needed. This work deals with the design method and control system of Ultra precision positioning apparatus. Control perfor-mance and stability analysis were performed in advance by modeling and designing the controller with Simulink.
鄭鳳守,金泰圭 진주산업대학교 1979 論文集 Vol.17 No.-
This study was carried out for the purpose of investigating the optimum moisture content harvesting time for binder work. The following are the results. 1. As the moisture content of Milyoung 23 and Milyoung 15 were decreasd, the total yield of both varieties were increased improportionally. The maximum yields were shown at their grain moisture contents of 21.7% and 19.7% respectively. 2. Shattering losses of Both varieties were 1.63% to 3.12% and 0.21% to 0.68% respectively. This means that the total loss of Milyoung 23 is significantly greater than that of Milyoung 15. 3. The optimum harvesting bassed on Maximum field yield was found to be at a grain moisture content of 21.7 persent for Milyoung 23 and 19.7 persent for Milyoung 15, maximum field yield at the time amounted to 780㎏/10a for Milyoung 23 and 620㎏/10a for Milyoung 15.
Preparation and Characterization of Monodispersed and Nano-sized Cu Powders
Kim Tea-Wan,Lee Hyang-Mi,Kim Yong-Yee,Hwang Kyu-Hong,Park Hong-Chae,Yoon Seog-Young 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Monodispersed and nano-sized Cu powders were synthesized from copper sulfate pentahydrate inside a nonionic polymer matrix by using wet chemical reduction process. The sucrose was used as a nonionic polymer network source. The influences of a nonionic polymer matrix on the particle size of the prepared Cu powders were characterized by means of X-ray diffraction), scanning electron microscopy), and particle size analysis). The smallen Cu powders with size of approximately 100 nm was obtained with adding of 0.04M sucrose at reaction temperature of . The particle size of the Cu powders prepared by the reduction inside polymer network was strongly dependent of the sucrose content and reaction temperature.
Preparation and Characterization of Monodispersed and Nano-Sized Cu Powders
Kim, Tea Wan,Lee, Hyang Mi,Kim, Yong Yee,Hwang, Kyu Hong,Park, Hong Chae,Yoon, Seog Young Trans Tech Publications, Ltd. 2007 Materials science forum Vol.534 No.-
<P>Monodispersed and nano-sized Cu powders were synthesized from copper sulfate pentahydrate (CuSO4ㆍ5H2O) inside a nonionic polymer matrix by using wet chemical reduction process. The sucrose was used as a nonionic polymer network source. The influences of a nonionic polymer matrix on the particle size of the prepared Cu powders were characterized by means of Xray diffraction (XRD), scanning electron microscopy (SEM), and particle size analysis (PSA). The smallen Cu powders with size of approximately 100㎚ was obtained with adding of 0.04M sucrose at reaction temperature of 60°C. The particle size of the Cu powders prepared by the reduction inside polymer network was strongly dependent of the sucrose content and reaction temperature.</P>
황산용액에서 플라즈마 용접 및 열처리 조건이 티타늄의 부식특성에 미치는 영향
김창규(Chang-Kyu Kim),강현후(Hyun-Hoo Kang),박대주(Dea-Ju Park),김태원(Tea-Won Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The influences of plasma weld conditions together with heat treatments on the corrosion behavior of titanium in sulfuric acid were analyzed. Several tests were conducted by means of electrochemical polarization and immersion experiments to determine the corrosion rate of titanium materials. The rate of corrosion was then evaluated in terms of the values of corrosion potential, passivation current density and weight loss of the materials, respectively. Six types of specimen were used in the test. As shown in the results, the most effective weld conditions including processing time and value of current with heat treatment could be determined in sulfuric acid environment.