• Proceedings of the Korean Geotechical Society Conference
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• 2001.03a
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• pp.363-370
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• 2001

A computationally efficient algorithm to analyze a group pile behavior is proposed by consideration of both soil-pile and pile-cap interactions. Using toad transfer method the nonlinear characteristics of the soil-pile interaction for a single pile is modeled by piecewise linear soil springs (p-y, t-z, and q-z curves). Beam-column method, one of the most practical approaches, is used for numerical modeling of the soil-pile system. In addition to the group effect resulting from the soil-pile-soil interaction, for a more realistic analysis it is essential to consider the effect of pile-cap interaction including geometric configuration of the piles in a group and conectivity conditions between piles and the cap. This paper mainly focuses on the pile-cap interaction and the development of a rational numerical procedure of its incorporation with the beam-column method.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1993.04a
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• pp.72-72
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• 1993

Chan'su the dried toad venom preparation, has been used for centuries as a cardiotonic a local anesthetic and in the treatment of ecphyma. Bufadienol ides are major effective components of Chan'so. Their pharmacological activities have been studies to date. However, their pharmacokinetic and metabolism have not been studied. Considering variously divergent pharmacological actions of bufadienolides we decided to examine their metabolism and their other biological activites. We isolated and purified various components of bufadienolides. Cinobufagin and bufalin are prominent components. Firstly we examined metabolism of cinobufagin and found that this compound was extensively metabolized into various metabolites by mixed-function oxidase and deacetylase.

• Journal of the Korean Society of Safety
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• v.16 no.3
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• pp.45-52
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• 2001

This paper presents a study on the assessment of fuzzy measure possibility for the electromagnetic field of unbalanced system. It takes into account m untransposed transmission line and unbalanced load. A three phase load flow program was developed which employs a Newton-Raphson method as a tool to analyze system unbalanced. This research presents a method of handling two coupled three phase transmission system unbalance analysis and unbalanced power demand as a function of voltages. In assessment of fuzzy measure possibility for the electromagnetic field, this paper use probability of fuzzy and measure of fuzziness technique.

• Proceedings of the KIEE Conference
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• 1998.07c
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• pp.911-914
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• 1998

This paper presents an algorithm that evaluates the transfer capability of composite power systems using probabilistic approaches. The reliability indices calculated by using probabilistic method are expected maximal flow, expected transfer capability margin, and expected power not supplied. In this paper, a successive linear programming technique is used to evaluate transfer capability named maximal flow. Physical constraints considered in the maximal flow problem are the limits of toad voltage, line overloading, and real & reactive power generation. Numerical results on IEEE RTS show that the proposed algorithm is effective and useful.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2000.10a
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• pp.90-100
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• 2000

The present paper investigates the elasto-plastic buckling of ball-jointed single layer latticed domes considering the connection characteristics. The domes are composed of tubular member elements, ball joints and connectors. To judge yielding of the member, the ends and central part of tubular member elements are assumed as five elasto-plastic springs. Elasto-plastic buckling load can be identified the yielding load of estimated member As a numerical analysis technique, loading incremental method based on the Newton-Raphson method is used. The effects of connection characteristics are investigated by the following points; (1) the length of rigid zone, (2) looseness of screw, (3) diameter of connector Finally, it is emphasized that the connection characteristics as well as the material non-linearity have significant effects upon the buckling toad of domes.

• Computational Structural Engineering
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• v.3 no.1
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• pp.51-57
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• 1990

The current load combination criteria for design of nuclear power plant structures(NPP) are not based on the probability-based design concept but rely on the conventional design concept. In this paper, a load combination criteria for design of NPP containment structures are proposed based on a FEM-based random vibration analysis. More accurate reliability analyses under various dynamic loads such as earthquake loads were made possible by incorporating the FEM and random vibration theory, which is different from the conventional reliability analysis method, In this paper, the toad factors for the design of NPP structures in Korea are proposed by considering appropriate load combination criteria for design.

• The Korean Journal of Zoology
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• v.17 no.4
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• pp.159-162
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• 1974

Serum protein and hemoglobin patterns were obtained by cellulose acetate electrophoresis for several anurans. Differences were found both in the number of components from individual animal hemoglobins and in the mobility of these components. Under the conditions employed, toad and R. plancyichosenica had a single component. Other frogs showed 2-component pattern. Sera of all anurans examined contain albumin but no preablumin. Relatively few assayable proteins are found in serum from B. buro gragraizans and differ thereby from most serum patterns examined for frogs, which show complex serum protein bands. Different species have dissimilar patterns although some of bands are apparently homologous between species.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.879-881
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• 2003

For quite a long time various researches and developments of superconducting magnetic energy storage(SMES) device for enhancement of power quality control of sensitive electric toad. This paper describes the design, fabrication and experimental results for the 3MJ SMES magnet made by using the design code of a SMES device that we developed. A computer code was developed to find the parameters of the SMES magnet which has minimum amount of superconductors for the same stored energy, and the 3MJ SMES magnet was designed based upon that.

• Proceedings of the KIEE Conference
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• 1993.07a
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• pp.61-63
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• 1993

This parer propose an adaptive methodlogy for setting of the underfrequency relays that is based on the initial rate of change of the frequency at the relay. During severe emergencies which result in insufficient power generation to meet load, an automatic load shedding program throughout the affected area can prevent total collapse. To avoid this kind of insufficient power generation, load shedding relays are often applied throughput the system to provide a means of helping balance the load to the remaining generation. Comparing, it has been found that the use of the proposed method for the amount and the timing of load shed more efficiently than the conventional method.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.20-21
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• 2000

광을 기반으로 한 논리 연산은 전자 소자의 속도 한계 및 연산 용량의 한계를 극복할 대안으로 많은 관심을 끌고 있다. 초고속 전광 논리 연산의 구현은 대부분 물질의 비선형성을 이용하며 특히 광섬유의 비선형 Ken 효과를 이용한 Sagnac 간섭계의 형태를 이용한 논리 연산이 주로 연구되어 왔다$^{(1)}$ . 그러나 광섬유의 비선형성을 이용하기 위해서는 충분히 큰 광 강도가 필요하며 회로 구성에 있어서도 크기가 크다는 단점이 있다. 최근에는 반도체 광증폭기의 비선형 이득 포화 현상을 이용한 TOAD 등이 발표되어 상대적으로 크기도 감소하고 사용되는 광 강도 역시 감소시킬 수 있었다$^{(2)}$ . 간섭계를 이용한 광논리의 구현은 Sagnac 간섭계 뿐만 아니라 비선형 특성을 갖는 도파로로 구성된 Mach-Zehnder 간섭계, Michelson 간섭계 등도 이용이 가능하다. (중략)