• Earthquakes and Structures
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• 제23권3호
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• pp.245-257
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• 2022

This study is a basic study on the seismic reinforcement method of anchors of fixed parts in order to reduce the effect of seismic motion that affects the facilities in the event of an earthquake. By applying the test method of ICC ES AC 156, a seismic simulation experiment was performed on the vibration table with three axes simultaneously using the number of connecting bolts between cabinets and channels as a parameter. In addition, the reliability of the experiment was verified using numerical analysis, and the part about the dynamic characteristics that could not be performed according to the experimental limit was investigated through numerical analysis. As a result of the experiment, it was confirmed that the natural frequency of the main body was increased due to the increase in the number of connecting bolts between the cabinet-channel. Accordingly, it was judged that the rigidity of the lower part of the cabinet was increased due to seismic reinforcement. It was analyzed that the impact delivered to the body was effectively reduced. In the future, if the reinforcement of the connection parts mentioned in this study is added to the existing seismic reinforcement of the electrical cabinets, it is expected that the damage to the electrical cabinets of the power plant equipment caused by an earthquake will be effectively reduced.

• Journal of the Korean Data and Information Science Society
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• 제15권3호
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• pp.605-616
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• 2004

In this paper we consider the proportional hazard models for survival analysis in the microarray data. For a given vector of response values and gene expressions (covariates), we address the issue of how to reduce the dimension by selecting the significant genes. In our approach, rather than fixing the number of selected genes, we will assign a prior distribution to this number. To implement our methodology, we use a Markov Chain Monte Carlo (MCMC) method.

• 한국항공우주학회지
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• 제34권6호
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• pp.18-28
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• 2006

무딘 물체 주위의 고마하수 유동의 수치해석은 여러 문제점을 지니고 있으며, 이러한 문제점을 해결하기 위한 다양한 해석 기법이 제시되어왔다. 그러나 20년 이상된 수치 기법과 비교할 때 현장 경험의 부족, 그리고 특별한 응용을 위하여 기존의 코드를 수정하는 번거로움 등으로 인해 새로운 기법들은 한정된 응용 분야에서만 이용되고 있다. 본 연구에서는 지난 25년간 가장 널리 이용되고 있고 여러 상용코드에도 적용된 Roe의 FDS 수치해법을 이용하여 알고리듬이나 전산유체해석 코드의 수정 없이 3차원 고마하수 유동 해석의 문제점을 극복하는 방안을 살펴보았다. 매우 큰 마하수에서도 엔트로피 수정을 통하여 Riemann 해법들의 문제점으로 잘 알려진 carbuncle 현상이 해결 가능함을 보였으며, 비물리적 해의 문제도 초기조건의 간단한 수정으로 엔트로피 수정이나 격자 형상에 관계없이 해결할 수 있었다.

• 한국주거학회논문집
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• 제3권2호
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• pp.89-99
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• 1992

We discussed the change of housing environmental problems from the early 1900s to the present in Study(I). This study(II) which secendly research of study(I) analyzed the fixing precess of a lavatory centering around a excretion which was a serious housing environmental problem in 1920 to 1940. The documentary research method was used for this study. Articles of content analysis(N=185) were published in 1920 to 1990 which were The Deng-A daily news article about a excretion and a lavatory. The main content of this study was examined the change, such as the number of whole article, the column number of article by time series. and the content of article by subject. 1. The number of whole article by time series was collected mainly in1920s-1930s. In 1940s-1960s, one-two column of article was appeared generally and three-four, five column of article was appeared in 1970-1980. 2. Contents of article was divided into two classes, excretion and lavatory. Contents of excretion was 1) a use of fertilizer 2) the method of transportation 3) a cost of gathering 4) a place of disposal 5) the problem of cleaning. Contents of lavatory was 1) a public lavatory 2) a flush toilet 3) a sanitary conditions 3. 1) A use of fertilizer was concentrated in 1920s-1930s, and problems of it was solved more or less by change of management method. Transportation of excretion developed such as \ulcornerGue\ulcorner->a coach of tank style->underground transportation->a dung car of absorption style. Disposal place of excretion was a cause of dissatisfaction in 1920s and it is serious problem Today. A duty of excretion gathering was transfered to a private worker in 1978. The accunulation problem of excretion was continued until 1940s-1950s. The management law of waste matters was proclaimed in 1986. 2) A public lavatory was planned in 1924 for the first time, and it is insufficient in these days, A settlement of public lavatory in building which has upward of 20pyung became obligation in 1973. The problem of water contamination which by poor septic tank was happened in 1970s-1980s.

• 한국생물정보학회:학술대회논문집
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• 한국생물정보시스템생물학회 2005년도 BIOINFO 2005
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• pp.357-360
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• 2005

In this paper we consider the well-known semiparametric proportional hazards (PH) models for survival analysis. These models are usually used with few covariates and many observations (subjects). But, for a typical setting of gene expression data from DNA microarray, we need to consider the case where the number of covariates p exceeds the number of samples n. For a given vector of response values which are times to event (death or censored times) and p gene expressions (covariates), we address the issue of how to reduce the dimension by selecting the significant genes. This approach enable us to estimate the survival curve when n < < p. In our approach, rather than fixing the number of selected genes, we will assign a prior distribution to this number. The approach creates additional flexibility by allowing the imposition of constraints, such as bounding the dimension via a prior, which in effect works as a penalty. To implement our methodology, we use a Markov Chain Monte Carlo (MCMC) method. We demonstrate the use of the methodology to diffuse large B-cell lymphoma (DLBCL) complementary DNA(cDNA) data.

• 충청수학회지
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• 제35권4호
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• pp.335-343
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• 2022

We show that valleys, high peaks, and modular ascents are statistics of Fuss-Catalan paths having a distribution given by the Fuss-Narayana number. We prove the results using the Cycle Lemma and provide bijections among them. We also show that relative peaks are independent of the base path. In particular, valleys and high peaks can be obtained from relative peaks by fixing the base path in certain ways.

• 한국신뢰성학회지:신뢰성응용연구
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• 제18권1호
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• pp.40-48
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• 2018

Purpose: This research is to develop Trailer Durability Test of towing device, in order to cover usage conditions of bike type as well as general type trailer. With the diversification of leisure activities, the population that enjoys various sports and leisure has increased rapidly, and the number of vehicles equipped with camping trailers and bike carriers is also increasing steadily. The purpose of this study is to develop a durable vehicle that has no problem in various customer conditions. Methods: We measured the input load under various conditions of the user by attaching load cell to the body fixing part and towing ball of the towing device. The load in various modes was measured, and the difference between the trailer and the bike carrier type was compared and analyzed. Results: Due to the difference in fixing method and weight between the two types, the trailer has a large longitudinal force and the bike type has a large vertical force. Therefore, it is necessary to durability test method capable of satisfying all longitudinal force and vertical force. Conclusion: We improved the durability test of the towing device by changing the test surface. The new mode has made it possible to shorten the durability test schedule by increasing test efficiency.

• 한국토양비료학회지
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• 제20권3호
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• pp.269-274
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• 1987

간척지(干拓地) 토양(土壤)의 잡초(雜草) 및 수도근(水稻根) 조직(組織)에서 분리동정(分離同定)한 수종(數種)의 협생질소고정균(協生窒素固定菌)을 질소(窒素)를 함유(含有)하지 않은 순수배양(純粹培養) 내(內)에서 재배형(栽培型) 및 품종(品種)이 상이(相異)한 수도종자권(水稻種子圈)에 접종(接種)하여 수도(水稻)의 건물중(乾物重), 초장(草長), 근장(根長), 근수등(根數等)의 생육특징(生育特徵)과 협생질소고정력(協生窒素固定力)을 조사(調査)한 결과(結果) 수도품종(水稻品種) 및 협생질소고정균(協生窒素固定菌)의 조합간(組合間) 교호작용(交互作用)은 통계적(統計的)으로 유의(有意)한 상관관계(相關關係)를 보이지 않했다. 그러나 공시수도품종중(供試水稻品種中)에서 Annapuruna는 7종(種)의 협생질소고정균(協生窒素固定菌)을 접종(接種)하므로써 생육량(生育量) 증가(增加)를 보였다. 그리고 7종(種)의 협생질소고정균(協生窒素固定菌)을 교호접종(交互接種)했을때 협생질소고정력(協生窒素固定力)은 Annapuruna와 신광(新光)벼 조합(組合)에서 가장 높았으며 IR-8이 가장 낮았다. 또한 협생질소고정균(協生窒素固定菌)과 수도품종간(水稻品種間)에는 신광(新光)벼와 Pseudomonas sp. H8 조합(組合)에서 질소고정력(窒素固定力)이 가장 높았다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2000년도 추계학술대회 학술발표 논문집
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• pp.313-318
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• 2000

Image segmentation is to divide an image into similar parts or objects. This paper presents a segmentation system which consists of a fuzzy neural network and a set of image processing filters. The fuzzy neural network does not need initialization of weights. Therefore it does not have the underutilization problem. This fuzzy neural network controls the size and number of clusters by the vigilance parameter instead of fixing the number of clusters at the initial stage. This fuzzy neural network does not require large amount of memory as in Fuzzy c-Means algorithm. Two satellite images were segmented using the proposed system. The segmented results show that the proposed system is better on segmenting images.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.656-660
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• 2003

We studied the crystallization behavior of LP-CVD a-Si film using UV pulsed laser. With increase in the shot number of irradiation by fixing its energy density, poly-Si film having a large grain size of $0.5 {\mu}m$ was obtained. By analyzing the crystallized Si films using optical analysis such as Raman spectroscopy or AFM technique etc., conspicuous correlation between the grain size and the resultant film properties such as the stress or the roughness has been found. With the increase in the energy density or the shots number of laser, remarkable grain growth occurred following to the roughness formation corresponding to the increase in the tensile stress.