• Journal of the Korean Society for Precision Engineering
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• v.19 no.11
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• pp.167-173
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• 2002

The look up table method conventionally applied to control the inner temperature and humidity of a laver drying machine has repeatedly occurred not only laver's damage but also inferior goods since the reaching time at the optimum state takes a long time. In this paper, a fuzzy control theory instead of the look up table was proposed to reduce the reaching time at the optimum state. The proposed method used six input variables and four output variables for the fuzzy control, and a triangle rule for a fuzzifier, The Mandani's min-max method was applied to a fuzzy inference. Also, the mean method of maximum was applied to a defuzzifier. The method applied to the fuzzy controller contributed to reduce the reaching time at the optimum state, and to minimize not only laver's damage but also inferior goods.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.10a
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• pp.212-217
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• 1993

A 2-dimensional FEM/GEM program was developed for analyzing forming processes of an arbitrarily shaped draw-die, in which plane strain condition is assumed and linear line elements are employed. FEM formulation adopted a new algorithm for solving force equilibrium as well as non-penetration condition simultaneously. For the case of numerical divergence at nearly final forming stages and the initial guess in Newton-Raphson iterations, geometric force equilibrium method(GEM) is also introduced. The developed program was tested with the simulation of stamping processes of automotive bonnet inner pannel in order to verify the usefulness and validity of FEM/GEM formulation.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2001.10a
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• pp.387-392
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• 2001

Fused deposition(FD) modeling by Stratasys Inc., is one of the material deposition subfamilies of solid freeform fabrication(SFF) technologies. In this process, build material in the form of a flexible filament, is heated to a semi-liquid state and extruded from a robotically controlled deposition head onto a fixtureless table in a temperature controlled environment. The position of nozzle is computer controlled relative to the base, which allows geometric complex models to be made to precise dimensions. FDM provide what the part was directly tested by the worker. It provide believable data. This study is experiment on surface roughness of part at FDM

• Journal of the Korean Society for Precision Engineering
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• v.15 no.4
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• pp.44-50
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• 1998

The creep life fraction can be evaluated by the degree of grain deformation since the grain of Cr-Mo base metal deforms in the direction of stress. The grain deformation method using image processing technique is developed for life assessment of in-service high-temperature components. The new assessment model of grain deformation method is presented to apply to in-service components and is verified by interrupted creep test for ex-serviced material of 1Cr-0.5Mo steel. The proposed model, which is irrespective of stress direction, is to evaluate mean of the absolute deviation for the measured ratios which are diametrical maximum to minimum dimensions for grains.

• Journal of the Korean Ceramic Society
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• v.36 no.6
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• pp.662-670
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• 1999

Porous alumina was fabricated from pressureless powder packing forming method using powders granulated by spray drying. It was investigated the pore size distribution of fabricated porous alumina. The results of microstructural observation showed that intraganular pore size and intragranular pore size. At 1700$^{\circ}C$ there were no intragranular pores but it showed homogeneous distribution of intergranular pore size. The bending strength and shrinkage increased as porosity decreased. In case of thermal shock resistance sudden decrease of bending strength to $\Delta$T was not shown because intergranular large pore prevented sudden crack propagation.

• Journal of computational fluids engineering
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• v.6 no.3
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• pp.19-26
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• 2001

An Eulerian-Lagrangian method, so called immersed boundary method, is used for analysing viscous flow around arbitrary bodies, where governing equations are discretized on a regular grid by using a finite volume method. To improve the accuracy of flow near body boundaries, a second-order accurate interpolation scheme is used and a level-set based grid deformation method is presented to construct the adaptive grids around body boundaries. The present scheme is used to simulate steady flow around a semicircular cylinder mounted on the bottom of flow domain and calculated results are validated by results of a body fitted grid method. Finally, present method is applied to a complex flow around multi body and the usefulness is checked by investigating calculated results.

• Journal of the Korean Society of Marine Environment & Safety
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• v.8 no.2
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• pp.17-22
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• 2002

Die vorliegende Arbeit handelt sich uber die Risikogesellschaft und das symbolische Strafrecht. Die Risikogesellschaft bedeutet die Ggesellschaft mit kunstlich erzeugten atomaren, chemischen, okologischen und gentechnischen Selbstvernichtungsmoglichkeit. Die Risikogesellschaft hat offenbar dort, wo sie die Gefahren nicht leugnen kann, Bedurfnis nach Minimierung von Unsicherheit, Dieses Be-durfnis wirkt sich einmal aus in der Neigung, das Entstehen bestimmter nicht konsentierter Gefahren schon in einem sehr fruhen Stadium der Entwicklung mit Hilfe des Strafrechts zu stoppen. Vorverlagerung der Gefahrabwehr bedeutet im Fall des Strafrechts die Vorfeldkriminalisierung. Hierfur scheint es zwei wichtige Methoden zu geben: die Formulierung weit vorgelagerter Rechsguter und die Konstruktion vorfelderfassender Deliktstypen. Aber in die modeme Risikogesellschaft handelt sich das Strafrecht mit dem Versuch der Vorfeldkriminalisierung unubersehbare Vollzugsdefizite ein. Neben Ermittlungsschwierigkeiten sind hierfur strukturelle Zurechnungsprobleme und evidente Kontra-produktivitat verantwortlich. Es scheint dennoch einen naheliegenden Ausweg zu geben. Wo das Strafrecht in seiner instrumentellen Wirkung versage, wo ein unvermeidbares Vollzugsdefizite vorliege, komme dem Strafrecht doch eine gewichtige symbolische Bedeutung zu. Aber ein Strafrecht, das sich als Mittel zur Losung von System-problemen versteht, wirkt instrumentell zu wenig, um seine Kontraproduktivitat auszugleichen. Eben darunter leidet dann aber auch seine symbolische Wirkung, die man sich zunachst noch eine Zeitlang von ihm erhoffen mag.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.239-240
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• 2014

2014년 9월 29일부터 아동학대 가해자에게 무기징역까지 처벌을 강화하고, 친권 제한도 가능케 한 '아동학대범죄의 처벌 등에 관한 특례법(아동학대처벌법)'이 시행되고 있다. 동법의 내용으로는 기존 형법상 '3년 이상의 유기징역'에 집행유예가 가능한 학대치사죄에 대해 법정형을 '무기 또는 5년 이상의 징역'으로 높이고 별도의 감경사유가 없는 한 집행유예가 불가능하도록 했다. 아동학대 가해자가 친권자라는 이유로 피해아동을 격리시키기 힘들었던 점을 개선하기 위해 친권을 제한할 수 있는 길을 터놓았다. 부모(친권자)가 중상해를 입히거나 상습적으로 학대한 경우엔 검사가 법원에 친권상실을 청구해야 하며, 검사가 하지 않으면 아동보호전문기관의 장이 청구를 요청할 수 있도록 했다. 본고에서는 아동학대의 실태를 기초로 하여, 아동학대처벌법의 내용과 문제점을 살펴보기로 한다.

• Transactions of the Korean Society of Mechanical Engineers
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• v.10 no.5
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• pp.653-660
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• 1986

Two uppor bound solutions, by the force balance method and by a kinematically admissible velocity field, are compared for the metal forming problems in plane strain. It is concluded that these two approaches always give identical results when the geometrical configurations of the deformation model reman the same. By detailed derivations for plastic bending of a notched bar, closed die forging, compression of a rectangular block, machining with a restricted contact tool and plane strain backward extrusion, the identity of both approaches is verified.

• Proceedings of the Korean Nuclear Society Conference
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• 1997.10a
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• pp.25-31
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• 1997

현대적 노달방법은 다차원 중성자 확산방정식을 풀기 쉽고 계산시간을 단축시킬 수 있도록 각 방향에 대하여 횡방향으로 적분하여 등가인 차원 수 만큼의 1차원 중성자 확산 방정식을 만들어 풀고 있다 이 과정에서 횡방향 누출 중성자 적분항을 적절히 근사해야함이 필수적인데 이로 인하여 계산의 정확도를 손상하게 될 수가 있다. 이러한 횡방향 누출 중성자 근사를 제거하여 계산의 정확도를 향상시킨 것이 노달 해석함수 전개법(Analytic Function Expansion Nodal Method)이다. 그러나 이 방법은 기존의 노달 방법 보다는 계산시간이 다소 많이 소요되는 단점이 있었다. 본 논문에서는 소격격자 재균형 가속법(Coarse-Mesh Rebalance Acceleration Method)을 노달 해석함수 전개법에 적용하면 계산의 정확도는 그대로 유지되면서도 속도는 크게 향상시킬 수 있음을 보여 준다.