• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 A
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• pp.260-263
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• 1997

In this paper, we describe the mechanical strain effects on the critical current density of HTS (BSCCO) pancake-type-magnet. Firstly the strain of pancake coil is calculated in terms of coil length, which is also a function of angle, and then the critical current density degradation due to strain is calculated along the coil. We assumed that the critical current density degradation pattern is same with that of $Nb_{3}Sn$. We also modelled the effects of magnetic field on the critical curent degradation, and the results are compared with those with null magnetic field.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2012년도 춘계 종합학술대회 논문집
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• pp.425-426
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• 2012

최근 건설 분야에서는 3차원 설계로 대표되는 Building Information Model(BIM)에 관련된 연구와 현업적용이 활발히 시도되고 있다. 이런 추세에 맞추어 정부에서는 2013년부터 500억 이상의 공사에 BIM을 적용하기로 결정했다. 따라서 BIM의 핵심이라 할 수 있는 정보모델 관련 소프트웨어의 필요성과 활용의 공감대가 확산되고 있다. 또한 클라우드 컴퓨팅 기술의 보편화에 따른 가상협업환경이 도래하여 BIM 기반의 시설물 정보관리의 보급과 실용적 효과를 높이기 위해 건설과 ICT기술의 융합을 통한 미래 응용기술 연구가 무엇 보다 절실한 시점이다. 이 연구는 클라우드 컴퓨팅을 활용하여 BIM기반 서비스를 제공하기 위한 프로젝트의 전략적 접근방법을 다루고 있다.

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 1998년도 Advances in Ginseng Research - Proceedings of the 7th International Symposium on Ginseng -
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• pp.31-39
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• 1998

We have investigated the antinociceptive efficacy of ginseng saponins in mice using l% formalin, which induce two phases of pain (acute and tonic pains) and is known to induce a clinically related pain. Ginseng total saponins (GTS) relieved both phases of pain with EDso of 162 mghg for acute and 92 mg/kg for tonic pain, respectively. Both protopanaxadiol (PD) and protopanaxatriol (PT) saponins did not attenuated acute phase of pain but relieved tonic phase of pain with EDso of 45 mg/kg for PD saponins and 105 mghg for PT saponins, respectively. Moreover, ginsenoside Rc, Rd, and Re among representative ginsenosides such as Rbl, Rc, Rd, Re and Rgl relieved slightly but significantly acute phase of pain and strongly attenuated tonic phase of pain but Rf relieved only tonic phase of pain. However, PD and PT saponins, and the individual ginsenosides tested except GTS did not greatly attenuate thermal noxious pain (tail-flick test). These results suggest that single ginsenoside or mixture of various ginsenosides mainly induce differential antinociception in mice.

• Bulletin of the Korean Chemical Society
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• 제24권9호
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• pp.1303-1307
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• 2003

The low molecular water-soluble chitosan nanoparticles (LMWSC-NPs) were prepared, which was modified with hydrophilic and hydrophobic moieties to evaluate the potential for pharmaceutics application. The synthesis of LMWSC-NPs was identified by FT-IR and $^1H$-NMR spectra. Also, we measured the photon correlation spectroscopy (PCS), transmission electron microscope (TEM) and atomic force microscope (AFM) to investigate the characteristics and morphology of the LMWSC-NPs. At the PCS measurement, the more increase the number of substitutive group, the more decrease the positive charge of LMWSC-NP surface. From the results of TEM and AFM, spherical morphologies were observed, and their sizes were 30-150 nm. Resultantly, LMWSC-NPs prepared in this experiment will be expected as a suitable device for the drug targeting system.

• Imaging Science in Dentistry
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• 제32권4호
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• pp.231-234
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• 2002

The odontogenic myxoma is an infiltrative benign tumor of bone that occurs almost exclusively in the jaw bones and comprises 3% to 6% of odontogenic tumors. This neoplasm is thought to arise from the primitive mesenchymal structures of a developing tooth, including the dental follicle, dental papilla, or periodontal ligament. Radiographically the odontogenic myxoma may produce several patterns: unicystic, multilocular, pericoronal, and radiolucent-radiopaque, making the differential diagnosis difficult. In this report, two cases of the odontogenic myxoma in the jaw bones are presented. The first case involved only the mandible, while the second case involved the maxilla. Both cases presented extensive multilocular radiolucencies characteristic of odontogenic myxoma.

• 한국군사과학기술학회지
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• 제13권6호
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• pp.1026-1033
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• 2010

The analysis of water-entry impact forces acting on the fin shaft of high speed water-entry body is described. During the entry of high speed body into water, the physical phenomenon and flow properties are analyzed. A proper analysis model is established and the method to estimate the flow force which causes impact torque at the fin shaft is described. It is assumed that the fin shaft is damaged by the force which is induced by contacting with cavity wall. The pressure distribution of fin and the maximum torque are estimated and compared with breaking force. Conclusively, it is hard to resist water-entry impact force in terms of the reinforcement of fin shaft. Additionally safe equipment is essentially required.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 추계학술발표논문집 (중)
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• pp.845-848
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• 2002

IPsec 기술은 양단간 보안은 물론, 모드, 암호 프로토콜, 다양한 암호화 알고리즘들의 조합을 통해서 다양하고 계층적인 보안 서비스를 제공한다. VPN 서비스가 제공되는 가장 일반적인 유형은 원격 접속자의 공동 인트라넷에 대한 접근을 허용하는 것이다. 하지만 NAT(Network Address Translation) 기술이 호텔과 같이 원격 접속자가 주로 사용하는 곳은 물론 홈 게이트웨이와 같은 네트워크 장치에 널리 사용되고 있어 IPsec 을 통한 양단간 통합 보안 서비스를 제공하는데 치명적인 장애가 발생한다. 따라서 본 논문에서는 IPsec 기술을 NAT 상의 네트워크에 적용할 때 발생하는 문제점과 기존의 해결 방안에 대해서 언급하고 이들의 장 단점을 분석한다. 또한 효율적으로 IPsec 기술을 NAT 네트워크 상에 적용할 수 있는 새로운 연동 방안을 제시함으로써 네트워크 구조에 독립적인 보안 서비스를 제공하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.305-307
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• 1998

One of the merits of superconducting magnet system is that it has persistent current mode, in which the current can be constant without any external power supply. The problem is that when we energize the magnet we can not reach the target current with constant current source, in principle. It needs another energization methods, in which it can be energized with reasonable accuracy and time. This paper suggests two energization methods for a superconducting magnet with persistnet current mode and the comparisons of the two are made with respect to the accuracy and the time.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.238-240
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• 1999

In this paper, the protection resistance determination for the field winding in superconducting generator is suggested. To protect the field winding in a generator, they usually use the external resistance to decrease the field current more rapidly when quench occurs in the winding. Since the field winding is actually separated into four sections (magnets), we have choices to insert 1, 2, and 4 external resistances. For each case, the current decay and the voltages across e winding are calculated, and we can choose the best external resistance.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.262-264
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• 1999

The AC losses of BSCCO-2223 multifilamentary superconducting tapes were measured using magnetization method and compared with the results of theoretically calculated values. In general, AC losses in multifilamentary superconducting tapes could be quantitatively explained by the simple sum of the Hysteresis and Coupling Loss. As a result of experiment, We found that AC losses of multifilamentary superconducting tape increase rapidly in large magnetic field region.