• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2011년도 춘계학술논문발표회 논문집
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• pp.47-52
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• 2011

컴퓨터 시뮬레이션과 건물의 센서를 접목한 센서연동 화재모델을 개발하였다. 화재 발생 시 건물 내 상태를 센서로 측정하며 이는 실시간으로 화재모델에 주입이 된다. 모델이 도출하는 시나리오와 센서 측정값을 비교분석하여 모델의 입력 변수를 조율하며 궁극적으로 모델이 실제 화재와 유사한 시나리오를 도출할 수 있도록 한다. 실제 규모의 화재 실험을 실시하였고, 센서연동 화재모델이 화재의 시작위치와 건물 내 출입문의 개폐 상태를 추정할 수 있음을 보였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2473-2478
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• 2011

The asset management of railway facilities is a total framework for finally supporting a safe and comfortable train service, which includes functions of supporting evaluation of condition and performance of infrastructures, making the decision method of repair or rehabilitation of deteriorated facilities, and lengthening the life cycle of structure through the decision of adequate cost and time of repair or reinforcement. In the range of the asset management, organization, human, the target, and information & data of company are included. Therefore, in this paper, appling the method of asset management analysis to the railway structures, the process of the risk assesment using BRE(Business Risk Exposure) and the basis of consisting optimized renewal decision-making are expressed.

• ALGAE
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• 제19권4호
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• pp.311-320
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• 2004

A great portion of the marginal zone in Lake Gocheonam was covered with reed plants. Algae attached to the reed stems were exclusively composed of diatoms. Sixty-six species of diatoms were encountered in a floral survey. The important species were Nitzschia liebetruthii Rabh., Nitzschia acicularis (Ku¨tz.) W. Sm., Navicula gregaria Donk., Cocconeis placentula var. lineata (Ehr.) V.H. etc. Among the diatom flora, six species - Navicula nivalis Ehr., Navicula recens Lange-B., Nitzschia angustatula Lange-B., Nitzschia compressa (Bail.) Boyer, Nitzschia lanceola var. minutula Grin. and Surirella crumena Bre´b. - were recorded in Korea for the first times. Life forms of the reed-attached diatoms were simply prostrate. The biomass of epiphytic algae ranged from 0.05㎍ chl-$\alpha$ cm$^{-2}$ to 2.32$\mu$g chl-$\alpha$ cm$^{-2}$. The algal biomass of dead stems was higher than that of the living stems, and their flora were rich. The algal biomass reached a maximum in the spring after the death of the reed plants. The reed plants exhibited rich diatom flora and significantly high algal biomass on their stems to have taxonomical and ecological importance in the freshwater.

• 대한수학회보
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• 제50권6호
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• pp.1863-1871
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• 2013

For a ring R with an automorphism ${\sigma}$, an n-additive mapping ${\Delta}:R{\times}R{\times}{\cdots}{\times}R{\rightarrow}R$ is called a skew n-derivation with respect to ${\sigma}$ if it is always a ${\sigma}$-derivation of R for each argument. Namely, if n - 1 of the arguments are fixed, then ${\Delta}$ is a ${\sigma}$-derivation on the remaining argument. In this short note, from Bre$\check{s}$ar Theorems, we prove that a skew n-derivation ($n{\geq}3$) on a semiprime ring R must map into the center of R.

• Journal of Information Technology Applications and Management
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• 제13권4호
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• pp.109-120
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• 2006

Enterprise Content Integration (ECI)is an IT strategy that improves enterprise' competitive advantages by integrating enterprise wide information and content into a unified view, which in turn supports efficient and effective decision making. Content Syndication Systems (CSS) is a solution that implements the ECI strategy. In semi-conductor industries, it is usual that enterprise content is scattered over tens of legacy systems. Therefore, engineers in semi-conductor companies spend a few hours to locate required engineering information on a daily basis as part of their jobs. In this paper, we develop an enterprise CSS system that integrates enterprise wide contents into a unified view that is suitable for semi-conductor industries. For this research, we first define enterprise CSS, then identify their systems requirements. Then we propose an architecture supporting the identified requirements, and present the implemented prototype. One of the most important requirements is the individualized subscription rule setting for engineering information. For this purpose, we developed methods to represent the information properties and subscription rules.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.512-521
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• 1998

The roll characteristic of railway vehicle is an important factor that affects the roll-over of vehicle and lateral ride comfort of passenger. Generally the roll characteristics of railway vehicle is defined by the term of roll-coefficient, s, which represents the ratio of incline or carbody to that of rail-cant. The limit values of roll coefficient recommended in UIC Bre 0.4 for coach without pantograph and 0.15 for vehicle with pantograph. The roll coefficient can be calculated by VAMPIRE that is the well-known commercial software for analysis of dynamic behavior of railway vehicle. The value of roll coefficient is effected by height of gravity center of carbody, stiffness of primary and secondary suspension and etc. The calculated roll-coefficient for electric locomotive and passenger coach is 0.12 and 0.77 respectively, The additional equipment such as anti-roll bar is considered in order to decrease roll-coefficient of passenger coach. In relation to roll characteristics, the analysis for roll-over due to wind is a1so performed. The results show that roll-characteristics affect the roll-over of vehicle.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2012년도 추계학술발표대회
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• pp.1357-1360
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• 2012

온라인 쇼핑객의 구매 규칙을 예견하기 위해 기업은 데이터 마이닝 기법을 사용하는데, 최대 빈발 패턴은 특정한 고객의 구매 원칙을 드러내기 때문에, 최대 빈발 패턴에 대한 마이닝은 최근 시장 분석에서 핵심적 이슈가 되고 있다. 본 논문에서 우리는 오리지널 데이터세트로부터 널 트랜잭션(Null Transaction)을 제거한 후, 최대 빈발 패턴을 발생시키기 위한 BRE-트리(Bottom-up Row Enumeration Tree)를 적용시켰다. 다음으로 온라인 거래 데이터베이스에서 고객 구매 규칙의 마이닝을 위한 항목들 간의 거리를 계산하기 위해, SCL(Sequence Close Level)의 변형된 버전을 사용하였다. 실험결과는 합리적인 시간 내에 고객의 구매 규칙을 더 정확하게 예견할 수 있음을 보여준다.

• Composites Research
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• 제36권1호
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• pp.37-41
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• 2023

선박의 평형수처리장치 전해조 내부 용액은 해수를 전기분해 시 DSA(Dimension Stable Anode) 전극에서 생성되는 수산화물로 인하여 높은 알칼리성 분위기를 생성한다. 본 연구에서는 기존 평형수처리장치 배관에 사용되어지는 PE 코팅 강관 배관의 취약성을 대체 가능한 복합재료로써 4가지 소재를 선정하였으며, 이들 BRE(Basalt fiber reinforced epoxy), BRP(Basalt fiber reinforced unsaturated polyester), GRE(Glass fiber reinforced epoxy), GRP(Glass fiber reinforced unsaturated polyester)를 강 알칼리성 NaOH 용액에 720시간 침지 후 마찰 및 마모 시험을 통하여 재료 마찰 깊이에 따른 마찰계수와 섬유와 수지 간 계면 결합 거동을 분석하였다. 그 결과, 수지와 섬유 간의 게면 분리 현상에 대한 메커니즘을 도출하였다. 또한, 불포화폴리에스테르와 같이 상대적으로 낮은 계면 결합력의 갖는 소재의 경우, 알칼리성 용액에 침지 시간이 길어질수록 표면에서부터 시작된 열화가 내부로 급격하게 확산되어 마찰 계수의 감소로 이어지는 경향을 나타냈다.

• Wind and Structures
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• 제5권6호
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• pp.493-514
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• 2002

Seven hip roof building models for $10^{\circ}$, $15^{\circ}$, $20^{\circ}$, $25^{\circ}$, $30^{\circ}$, $35^{\circ}$ and $40^{\circ}$ roof pitch with large overhangs of 1.1 m were tested in a wind tunnel at the university of Roorkee, India to investigate wind pressure distributions over hip roofs for various roof pitch and wind direction. The results show that the roof pitch and wind direction do significantly affect the magnitude and distribution of the roof pressures. The $40^{\circ}$ roof pitch has been found to experience the highest peak suctions at the roof corners amongst the seven hip roofs tested. Pressures on $15^{\circ}$, $20^{\circ}$ and $30^{\circ}$ hip roofs are comparable with those reported by Xu and Reardon (1998). Meecham et al. (1991) for $18.4^{\circ}$ hip roof is compatible with $15^{\circ}$ hip roof of the present study. Holmes's works (1994) on gable roof have also been compared with the present work. Zoning for codification has also been attempted since IS875 (Part-3) does not include this information. A comparison for design value has also been made with BRE Report No. 346.

• KSBB Journal
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• 제11권5호
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• pp.600-605
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• 1996

Taxus brevifolia와 Taxus cuspidata 현탁세포배 양에서 taxa!의 생산에 가장 적합한 초기 접종농도 를 결정하기 위해 접종농도를 세포생체중량으로 2.5, 5 5, 7.5, 10 g/flask가 되도록 변화시켜 세포의 생장 과 taxol의 생산을 측정하였다. Taxus brevifolia의 경우 초기 접종농도가 높을수록 lag phase가 감소되 는 경향을 보였으며, 두 가지 세포주(Taxus bre­1 vifolia와 Taxus cuspidata)에서 모두 초기 접종농도 를 5 g/flask가 taxol의 생산에 최척 임을 확인할 수 있었다. Taxol 생산에 가장 척합한 초기 접종농도로 생장배지와 생산배지에 세포를 접종시켰을 때 생장 배지에서는 taxal이 검출되지 않았지만 6% 자당을 이용한 생산배지에서는 9일째 taxol이 최대로 생산 되었다가 이후 다시 줄어드는 경향을 보였다.