• The Korean Journal of Applied Statistics
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• v.25 no.1
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• pp.81-87
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• 2012

A continuous time risk model is considered, where the premium rate is constant and the claims form a compound Poisson process. We assume that an injection is made, which is an immediate increase of the surplus up to level u > 0 (initial level), when the level of the surplus goes below ${\tau}$(0 < ${\tau}$ < u). We derive the formula of the ruin probability of the surplus by establishing an integro-differential equation and show that an explicit formula for the ruin probability can be obtained when the amounts of claims independently follow an exponential distribution.

• Journal of the Korean Institute of Gas
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• v.18 no.2
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• pp.16-20
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• 2014

In this paper, the performance of pressure-resistance is validated by experiment on LPG re-fillable cylinder which has increased demands for spreading of camp culture. Propane has increased suppliable requirements as fuel because of easily vaporizing effect of low boiling point. However, propane can be occurring safety problems inevitably by high vapor pressure. So, the priority is that safe cylinder should furnish in order to be circulated as safe fuel. LPG re-fillable cylinder for high pressure is tried to furnish internationally, that is restricted by safe issues. For these reasons, the pressurization and rupture are performed by using pressurizing device that is operated by hydraulic system. Also, this paper will offer rupturable characteristics comparing with vapor pressure of propane. This paper is expected as basis research for developing re-fillable cylinder and using standard for supplying them.

• Journal of the korean academy of Pediatric Dentistry
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• v.32 no.1
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• pp.136-143
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• 2005

The replacement of dental restorations due to secondary caries is a continuing problem in restorative dentistry. The secondary caries can be partly prevented by using fluoride containing dental materials such as glass ionomer cement, which releases and be recharged with fluoride ion acting as a fluoride reservoir. For the purpose of investigating the behaviors of fluoride release and recharge of conventional and high viscosity glass ionomer cements, the experiment was performed on the seven specimens each from 4 kinds of materials ; 1 kind of conventional glass ionomer cement, 2 kinds of high viscosity glass ionomer cements and 1 kind of composite resin. The amount of fluoride release was measured over 7 days with pH/ion meter and fluoride specific electrode. After measuring daily fluoride release, the specimens were recharged with 2% NaF solutions for 4 minutes and measured for 3 days with recharging repeated two consecutive times. The results were as follows : 1. Significantly more fluoride was released at first day after recharge in all materials except Z-100. 2. High viscosity glass ionomer cements released more or nearly equal amount of fluoride after recharge compared with the initial release(P<0.05). 3. The fluoride release after recharge with 2% NaF solution was in order of Fuji IX, Ketac Fil, Ketac Molar, Z-100.

• 대학교육
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• s.101
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• pp.102-104
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• 1999

• 공원문화
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• s.84
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• pp.24-25
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• 2009

바쁘고 지친 현실에서 벗어나 몸과 마음을 재충전하여 생활의 탄력을 찾으실 수 있는 곳 지리산 덕산 관광휴양지에 위치한 [우천정]을 소개 합니다.

• The Science & Technology
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• no.8 s.423
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• pp.102-105
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• 2004

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.43 no.7
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• pp.42-48
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• 2014

• The Korea Swine Journal
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• v.21 no.6 s.238
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• pp.66-70
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• 1999

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.497-498
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• 2016

DC 전송과 민감 부하가 발달함에 따라 안정적인 전력을 공급하기 위해서 신속한 차단이 가능한 DC 차단기가 요구된다. 이러한 배경으로 본 연구에서는 신속한 차단과 전류 커패시터를 쉽게 재충전할 수 있는 구조가 간단한 새로운 DC SSCB를 제안한다. 제안하는 DC SSCB는 단락사고를 모의하여 시뮬레이션을 통해 동작특성을 검증한다. 본 논문에서 연구한 DC SSCB는 향후 DC 그리드 시스템의 설계 및 구현에 활용될 것으로 기대된다.

• 건강소식
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• v.36 no.7
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• pp.20-22
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• 2012

올여름, 큰 맘 먹고 계획한 해외여행. 그런데 오랜 비행시간, 좁은 비행기 안, 낯선 풍토 탓에 여행을 즐기기도 전에 몸과 마음이 지쳐버릴 수 있다. 낯선 여행지에서 몸과 마음을 재충전해야겠다고 맘먹었다면 가장 중요한 것이 건강이라는 점을 간과하지 말아야 한다.