• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.10a
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• pp.158-161
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• 2008

In the line array roll set (LARS) process, the initial plate is progressed into the final shape in a stepwise or pathwise manner according to the basic principle of the incremental forming process. The deformation proceeds simultaneously in the longitudinal and transverse directions. It was found that the curvature level of the formed plates in the previous study was well over the curvature required in shipyards. This fact shows that the LARS method has considerable potential for shipbuilding applications. In this study, several experiments with the LARS system is carried out fur manufacturing of plates with large curvatures. The bulbs at a stem and stern among ship hull plates correspond to these plates. Furthermore, the qualities of formed plates are evaluated according to the types of roll arrangements through experimental and numerical analyses.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.17 no.3
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• pp.319-322
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• 2004

ZnO nanostructures were formed on a Si substrate by off-axis pulsed laser deposition(PLD) system in which a substrate plane was tilted toward a plume propagation direction. Atomic force microscopy (AFM) showed islands of 20∼40 nm width. From the x-ray diffraction (XRD) pattern exhibiting only (002) ZnO peak, the islands observed in AFM image were found to well crystallized. Optical bandgap enlargement from 3.26 eV to 3.35 and 3.47 eV due to the quantum size effect of ZnO nanostructures were observed by Photoluminescence (PL) at room temperature.

• Journal of Electrical Engineering and Technology
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• v.9 no.4
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• pp.1188-1195
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• 2014

This paper presents an analytical technique for reliability evaluation of electrical distribution network (EDN) containing distributed generation (DG). Based on hierarchical levels of circuit breaker controlling zones and feeder sections, a directed-relation-graph (DRG) for an END is formed to describe the hierarchical structure of the EDN. The reliability indices of EDN and load points can be evaluated directly using the formed DRG, and the reliability evaluation of an EDN containing DGs can also be done without re-forming the DRG. The proposed technique incorporates multi-state models of photovoltaic and diesel generations, as well as weather factors. The IEEE-RBTS Bus 6 EDN is used to validate the proposed technique; and a practical campus EDN containing DG was also analyzed using the proposed technique.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.26 no.1
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• pp.213-232
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• 2000

Cetostearyl alcohol has been incorporated into cosmetic or pharmaceutial emulsions to give them an appropriate consistency and a long term stability. It is well known that cetostearyl alcohol forms a gel phase with a nonionic surfactant in an aqueous system, and the properties of the gel phase depend on several factors such as the ratio of fatty alcohols. The aim of the present Paper is to investigate the effect of the structural difference of the lipophilic part of surfactants on the stability of the gel phase in the nonionic surfactant / cetostearyl alcohol / water ternary systems using differential scanning calorimeter. It is concluded that the gel phase formed by the surfactant having the bended alkyl chain is more unstable than that formed by the case of the straight alkyl chain, and we discussed the reason why the former is more unstable after long term storage by means of the measurements of the ${\Delta}$H.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1993.10a
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• pp.779-790
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• 1993

A prototype of the feeding-milking robot was developed in the Hungarian Institute of Agricultural Engineering in 1988-89. Before starting with the operation tests the cleaning system had to be elaborated . The cleaning system has two parts. Those are the complete cleaning of the system, producing a practically sterile state, as well as flushing through the milking device between milking of two cows. Separate electronic sensor development was necessary for both system which can connect to the control system of the robot. To clean the system pneumatic air input was applied. As an effect of the local adjustment of the electronic control system optimal flow conditions can be formed what is more favourable comparing to the earlier solutions of cleaning due to the mechanical effect. In the flushing through overpressure air is applied. The air and the cleaning liquid input duration can be adjusted to the local conditions. The electronic control unit can be connected to the electric ircuits of robot.

• Journal of the Korean Ceramic Society
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• v.30 no.12
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• pp.1071-1079
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• 1993

Interaction of alkali oxides and SO3 and C3S formation and microstructure was studied using K2CO3 and Na2CO3 as alkali sources and (NH4)2SO4 for SO3. When SO3/K2O=1.43 as mole ratio, K2O and SO3 react to form K2SO4, this phase is immiscible with other oxide melt and thus could not affect C3S formation as well as its microstructure. In a condition of SO3/K2O 1, C3S crystals were round and grown in a much larger size. With addition of Na2O and SO3 by only 1wt% each, C3S formation was strongly hindered. Since C2S was stabilized by Na+ and SO4-2, it could not react to give C3S formation. However in the condition of SO3/Na2O=1.43, a little amount of C3S was formed. It is considered that small amount of Na2SO4 was formed, this phase was immiscible with clinker liquid, and the C3S crystals were formed locally in the liquid part of relatively low Na2O and SO3 compositions. These crystals had irregular and rough surfaces and contained more inclusions than those grown from K2O.SO3 system.

• Proceedings of the IEEK Conference
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• 2004.06b
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• pp.371-374
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• 2004

In this paper, Ni Germane-silicide formed on undoped $Si_{0.8}Ge_{0.2}$ as well as source/drain dopants doped $Si_{0.8}Ge_{0.2}$ was characterized by the four-point probe for sheet resistance. x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscope (FESEM). Low resistive NiSiGe is formed by one step RTP (Rapid thermal processing) with temperature range at $500{\~}700^{\circ}C$. To enhance the thermal stability of Ni Germane-silicide, Ni/Co/TiN structure with different Co concentration were studied in this work. Low sheet resistance was obtained by Ni/Co/TiN structure with high Co concentration using 2-step RTP and it almost keeps the same low sheet resistance even after furnace annealing at $650^{\circ}C$ for 30 min.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.14 no.5
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• pp.211-214
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• 2004

Carbon nanofiber bundles were formed on silicon substrate using microwave plasma-enhanced chemical vapor deposition system. These bundles were vertically well-grown under the high negative bias voltage condition. The bundles were composed of the individual carbon nanofiber having less than 100 nm diameters. Turn-on voltage of the field emission was measured around 0.8 V/$\mu\textrm{m}$. Fowler-Nordheim plot of the measured values confirmed the field emission characteristic of the measured current.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05d
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• pp.700-704
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• 2002

본 논문은 UML로 모델링 된 Track&Trace 시스템[1]을 확장성과 유연성이 뛰어나며, 웹 상에서 안전하고 신뢰성 있으며 다양하고 광범위한 데이터 교환을 위한 XML로의 설계에 관한 연구이다. 이를 위해 UML 클래스 다이어그램의 클래스, 멤버 데이터와 데이터 타입을 이용해 Well-Formed XML에서 요소와 컨텐츠로 변환한다. 이러한 XML의 구조를 명확하게 정의하기 위해 클래스 다이어그램의 데이터 타입과 다중성을 이용해 DTD를 설계하고, 동시에 확장성을 갖춘 XML 스키마를 설계한다. 또한, XML 문서와 독립적으로 출력을 위한 스타일 지점인 CSS 와 XSL도 설계한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.335-337
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• 2000

본 논문은 JAVA언어로 프로젝트를 개발하는 경우 중요한 요소인 메뉴 시스템의 자동 생성에 관해 기술한다. 이를 위해 최근 인터넷 상에서 문서교환의 수단으로 사용을 하는 XML의 특성 중 정형(well-formed) 문서의 특성을 이용하여 JAVA에서 지원하는 메뉴 관련 GUI부분을 자동으로 생성한다. 이를 위해 메뉴 관련 자원(Resource)부분을 XML로 처리하기 위해 DTD(Document Type Definition)을 정의하였다. JAVA로 프로젝트를 수행 중에 있어서 빈번히 추가 삭제 가능한 부분을 XML로 처리를 함으로써 쉽게 메뉴 시스템을 변경, 조작할 수 있으므로 프로젝트 개발에 많은 시간을 줄일 수 있다.