• Journal of the Korean Society for Precision Engineering
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• v.25 no.7
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• pp.111-115
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• 2008

This paper describes the optimization of injection molding conditions to minimize sink marks. Sink marks, which refer to a small depression on the surface opposite a thick wall thickness, are often encounted in injection molded plastic parts. Part geometry, material properties and processing conditions during injection molding can affect the sink mark depth. We designed the runner system which is possible balanced filling to cavities using CAE program $Moldflow^{TM}$ and then obtained optimal processing conditions by Taguchi's Robust Design technique. By actual injection molding using optimized mold and molding conditions, it confirmed that sink mark depth decreased zero compared to 1mm level in the conventional mold and process.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.89-92
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• 2017

This study critically analyzes the present situation of the domestic game industry that infringes game nature or diversity, which is the essence of game contents such as copycat, auto play, excessive billing inducement, indiscriminate advertisement developed by focusing on commercial aspect, It suggests the necessity of creative and various game development environment. It suggests development direction for the development of domestic game industry through game case analysis which shows the possibility of game media out of existing success formula and does not concentrate only on commerciality and makes effort to give new fun to users.

• International Journal of Fluid Machinery and Systems
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• v.4 no.1
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• pp.47-56
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• 2011

Our previous experimental and numerical investigations of decelerated swirling flows in conical diffusers have demonstrated that water jet injection along the symmetry axis mitigates the pressure fluctuations associated with the precessing vortex rope. However, for swirling flows similar to Francis turbines operated at partial discharge, the jet becomes effective when the jet discharge is larger than 10% from the turbine discharge, leading to large volumetric losses when the jet is supplied from upstream the runner. As a result, we introduce the flow-feedback approach for supplying the jet by using a fraction of the discharge collected downstream the conical diffuser. Experimental investigations on mitigating the pressure fluctuations generated by the precessing vortex rope and investigations of pressure recovery coefficient on the cone wall with and without flow-feedback method are presented.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.687-689
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• 2005

Francis turbine of commercial small hydro -power plants under 10kw which is investigate a flow characterist and an efficiency in the research which it sees, the problem and an improvement is investigate. In the research which it is simply model with casing, guide-vane, runner, draft tube for simulation numerical analysis of small-sized Francis turbine. model uses the Gambit and it composes with approximately 800,000 nonuniform lattices. Solutions are investigate the hydraulic characteristics against an outward angle of guide vane, the number of guide vane, head(inlet velocity) by using FLUENT which is a commercial business code.

• Annual Conference of KIPS
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• 2003.05c
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• pp.1969-1972
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• 2003

전통적인 IDS는 단일 시스템, 단일 환경하의 침입 탐지만을 제공하므로, 보안대상 제한, 유연성 한계, 다양한 형태의 침입탐지 불가 등의 문제점이 대두되고 있다. 최근 이러한 문제점을 해결하기 위하여 여러 IDS의 침입정보를 통합, 분석하는 연구가 활발히 진행되고 있다. IDWG는 IDS간 상호운용을 지원하고자 침입정보 전송 프로토콜과 메시지 친환 형태를 표준화하는 작업을 진행하고 있다. 본 논문은 이 기종 IDS 관리 및 침입정보 통합을 위한 테스트베드 구축 과정을 제시한다. 단위 IDS는 Snort와 Snare를 사용하였으며, 국제표준을 준수하는 RoadRunner 라이브러리를 이용하였다.

• Journal of the Korean Solar Energy Society
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• v.21 no.1
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• pp.27-31
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• 2001

The Kaplan turbine model has been tested and analized. The blade angle and the guide vane opening of the turbine model were designed to be varied according to the best combination of guide vane and runner blade opening. When the changes in head and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed model in this study will be suitable for small hydro power stations with large changes in head and load.

• Journal of the Korean Society of Food Science and Nutrition
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• v.22 no.5
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• pp.576-580
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• 1993

An attempt was made to investigate the chemical compositions of the three plant types such as runner type(Yeoju landrace), semi-Spanish type(Suweon 15ho) and Spanish type(Wasedairu) of peanut. The proximate compositions were lipid 44.25~46.48% and protein 22.54~25.42% in various plant types of peanut, respectively. And the contents of purified free and bond lipids were 43.71~45.44% and 1.74~3.12%, respectively. The predominant fatty acids were oleic, linoleic, palmitic and arachidic acid in the free lipid, and linoleic, oleic and palmitic acid in t도 bond lipid. Pattern of 16 amino acid compositions in three plant types of peanut was shown to be similarity. Major amino acid were glutamic acid(75.30~104.66mg/g), arginine(57.30~74.27mg/g), aspartic acid(41.44~63.05mg/g) and leucine(30.80~39.00mg/g). The richest mineral contained in three plant types of peanut was noticed to be K and followed by Mg, Ca and Na. The lead content was below the authorized tolerance limits.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1383-1385
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• 2003

본 논문은 가전 및 사무용 전기전자기기에 있어서 대기전력의 정의를 조사하고 대기전력 절감을 위한 OECD국가들의 제도를 기술하였다. 대기전력 절감을 위한 주요국들의 제도는 규제와 자발참여 프로그램으로 대별하여 조사하였다. 대기전력 규제로는 일본의 top runner 프로그램과 스위스의 제도즐 소개하였으며 자발 참여 효율등급제로서 미국의 에너지 스타 제도와 기타제도에 대하여 기술하였다.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.215-216
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• 2006

To lower the cost of MIM products, the gate and runner materials and green parts with defects are usually recycled. It is necessary to understand what causes the recycled products to deteriorate. The results show that the viscosity of the 1R (recycled once) feedstock was slightly lower than that of the fresh material. However, as the number of recyclings increased, the viscosity increased, while the density decreased, and more defects were noticed duri ng solvent debinding. These deteriorations were mainly caused by the increase of the melting point of the backbone binder and the oxidation of the filler or paraffin wax.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09a
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• pp.205-206
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• 2006

A ball-shape alumina arc-tube for low-wattage lamp was developed by the PIM process. An ultra high purity translucentgrade alumina powder was used. In injection molding process, a hot-runner type mold was developed. The translucent-grade alumina powder was extremely sensitive to contamination so that the injection molding condition and atmosphere control in the furnace should be taken care of with extreme caution. Contamination sources were pinpointed with EPMA. The arc-tube was molded in half and two halves were bonded in the middle by a new bonding technique at room temperature developed in this study.