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3극 전계방출 전자총의 정전기 렌즈에 의한 전자빔 거동
김충수(Chung-Soo Kim),김동환(Dong Hwan Kim),박만진(Man-Jin Park),장동영(Dong-Young Jang),한동철(Dong-Chul Han) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.6
A field emission electron gun including 3 electrodes including one cathode and two anodes is very important for high resolution electron microscope. To have functions to control the initially-emitted electron beam, two anodes act as an electrostatic lens according to equipotential lines by adjusting the spot size, intensity, and working distance. To verify the action of the electron beam by the electrostatic lens by changing several parameters such as electrode shape, displacement and applied voltage to the electrodes, the two lenses were design and simulated and then their performances were analyzed with angular beam intensity(distribution), electrical optic axis variation and their stability.
김충수(C . S . Kim),이인덕(I . D . Lee),박종수(J . S . Park),임동찬(D . C . Rim) 한국축산학회 1989 한국축산학회지 Vol.31 No.11
A study was conducted to determine the herbage productivity and availability upon the flat, slope and forest type of grassland using Korean native cattle and sheep under 4 year old grassland established by intensive and semi-intensive sowing methods in Daecheon, from 1987 to 1988. The results obtained are summarized as follows ; 1. Orchardgrass made up the major plant species of the diets on all grassland types, especially the proportion of orchardgrass was 81-92% of the diets on the forest grassland. The proportions of tall fescue and ladino clover of the diets slightly increased on the flat and slope grassland in summer(July and August). Plant height and leaf area indes (LAI) on the flat, slope and forest grassland were 23.9cm-3.46, 23.1 cm-3.27 and 21.3cm-2.91 in average, respectively. Total dry matter(DM) yield per ha on the flat, slope and forest grassland was 10,286kg, 9,563kg and 6,341kg, respectively. The seasonal distribution of DM yield on all grassland types was 64∼70% in spring (April, May and June). Crop growth rate (CGR) on the flat, slope and forest grassland were 44.4kg, 41.4kg and 27.3kg, respectively. 2. Contents of crude protein (CP) and in vitro DM digestibility(IVDMD) of collected herbage samples were high in spring, while contents of crude fiber(CF) and neutral detergent fiber(NDF) were high in summer on all grassland types. The order of the contents of CP and IVDMD was flat$gt;slope$gt;forest grassland. The DM and organic matter(OM) intake per unit metabolic body size(g/w^75kg) were high on the flat, grassland, but those on the forest grassland, were low, digestible DM intake(DDMI) and DOMI showed a same tendency. Significantly positive correlations was found between DMI and CP(p$lt;0.05), and IVDMD(p$lt;0.01), but significantly negative correlation(p$lt;0.05) was found between DMI and NDF on all grassland types. The order of the DMI was spring$gt;summer$gt;autumn. 3. The percentage of herbage utilization on the flat, slope and forest grassland was 76.2%, 75.2% and 74.8%, respectively. The order of diet preference based on the relative intake index(RII) and touch number was flat$gt;slope$gt;forest grassland. Grazing capacity on the flat, slope and forest grassland was 542,496 and 323 cow-day/ha in average, respectively. The calculated value of grazing area per cattle(AU) on the flat, slope and forest grassland was 0.67ha, 0.74ha and 1.13ha, respectively. 4. Grazing and ruminating time were not different among the grassland types, but those were slightly increased on the forest grassland. Resting and loafing time were slightly increased on the flat grassland. Walking time was increased on the slope grassland. The number of rumination, chews per bolus and urination were slightly increased on the forest grassland, but defecation number was increased on the flat grassland. The number of drinks, total drinking water consumption and walking distance were slightly increased on the slope grassland. 5. Animal distance and occupied area per cattle on the flat, slope and forest grassland were 4.34m-11.7㎡, 3.97m-12.6㎡ and 3.76m-16.8㎡, respectively. Subgroup formation on those grassland was 3.9head, 4.4 head and 4.2 head per group respectively. The order of grazing movement was similar to the pear-shaped grazing formation, but the relation of dominance between first grazer and last grazer upon different grassland types was not clear. 6. Eating, ruminating and chewing time on the flat grassland were slightly less than on the other grassland. The order of eating rate, ruminating and chewing efficiency was flat) slope) forest grassland. 7. Live weight gain per day on the flat, slope and forest grassland during the grazing and feeding was 0.586-0.923kg, 0.565-0.882kg and 0.470-0.826kg, respectively. The order of feed efficiency was flat$gt; slope$gt;forest$gt;grassland. 8. The cost value of grasses per ha which was not included the rent was 650.1 thousand won on the flat, 650.1 thousand won on the slope and 5
철도종사원의 성격유형과 직무만족에 관한 실증적 연구 Ⅰ
김충수(Chung Soo Kim),안준용(Joon Yong An),김백(Baek Kim) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, The business environment is very rapidly changed and complicated. Therefore, the companies are confront with the biggest difficulty. To overcome this difficulty, the management should be able to accomplish the human resources management and the efficient business management. Korea railroad industry has a close association with national life as it carries out public works based on its public nature as well as purses the corporate spirit. For that reason, Korea railroad industry has a great spin-off on national economy and exerts a tremendous impact on the improvement of productivity around the industries and the international competitiveness at aspect of efficiency resulting from business rationalization. Railroad system can be described as organic. Railroad Employs take a great role in this system. According the psychology and the Organization Behavior, the decision maker"s personality and employee" work satisfaction have influence on performance. The purpose of this study is to examine the Railroad Employs" Personality and Work satisfaction which influence on the efficient business management.
정전기렌즈에 의한 전계방출 전자빔 방출 특성 해석 및 실험
김충수(Chung-Soo Kim),박만진(Man-Jin Park),양희남(Hee-Nam Yang),장동영(Dong-Young Jang),김동환(Donghwan Kim),한동철(Dong-Chul Han),안성훈(Sung-Hoon Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A field emission electron gun including three electrodes which are one cathode and two anodes is very crucial for high resolution electron beam applications. To have functions of controlling the initially-emitted electron beam from cathode, two anodes have to form proper equi-potential lines between two anodes (electrostatic lens) being capable of adjusting the beam intensity. To verify the action of electrostatic lens by changing some parameters such as electrode shape, displacement and applied voltage to the electrodes, the two lenses were design and simulated with OPERA-3D. In addition, electron beam behaviors, angular beam intensity (distribution), in three electrodes were tested.
김충수(Chung-Soo Kim),박범환(Bum Hwan Park),안준용(Joon-Yong An) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
국내외적으로 경쟁에 직면하고 있는 기업들은 보다 좋은 품질의 제품을 보다 저렴한 가격에 판매하지 않으면 생존하기가 어렵게 되었다. 최근 들어 물류이동과 수송으로 인하여 우리 나라 철도산업이 동북아의 물류중심으로 자리잡고 있다. 반면, 철도는 기간산업으로 건설에 대규모의 투자가 이루어지며 운영에 따른 자산유지비용 등 막대한 비용이 발생하여 수익성과 유통성에 문제점을 발생시키고 있는 실정이다. 이러한 환경변화에 생존하기 위하여 보다 정교한 비용정보와 원가관리가 중요하게 되었다. 원가기획 및 원가관리의 효과적 수단으로 크게 관심이 집중되고 있는 수명주기원가(Life Cycle Cost, LCC)가 있다. 기존의 철도분야의 연구에서는 철도기반시설과 차량에 대한 LCC에 대한 연구는 있어 왔지만, 이를 원가관리와 관련한 연구는 거의 없는 실정이다. 이에 철도자산의 효과적인 원가관리수단으로 LCC를 연구하고자 한다.