• Journal of The Korean Astronomical Society
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• v.31 no.1
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• pp.27-37
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• 1998

We have made semi-analytical studies to investigate the configurations of caustics and the probability distribution of the flux factor K for the binary microlensing including external shears. A parametric equation of critical curve is derived in a 4th order complex polynomial. We present the topological dependencies of the caustics for selected gamma parameters (0, 0.3, 0.6, 1.3, 2.0, and 2.5) and convergence terms (0., 0.4, 0.8, 1.2, 1.6, and 2.0). For the purpose of analyzing the efficiency of High Amplification Event (HAE) on each caustics, we examine the probability distribution of the flux factor by a Monte Carlo method. Changing the separation of the binary system from 0.8 to 1.3 (in normalied unit), we examine the probability distribution of the K-values in various gamma parameters. The relationship between gamma parameters, seperations and their probabilties of the flux factor K have been studied. Our results show that the relatively higher K values (K>1.5) are increased as increasing the separation of the binary system. We therfore conclude that, in the N-body microlensing, the probabilities of higher HAEs are inversely proportional to the star density as well. We also point out that the present research might be used as a preliminary step toward investigating heavy N-body microlensing simulations.

• Journal of Environmental Science International
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• v.12 no.2
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• pp.185-193
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• 2003

The purpose of this study was attempted to establish concepts of environmental-friendly applications of flood plain and to suggest the application plans. The results of this study can be summarized as follows; 1. Roles of flood plain as biotop (restoration, preservation, and creation of stream corridor ecosystem) should be considered. 2. Application methods considering environmental and scenic values should be reviewed. 3. Application methods reflecting values as regional ecological resources should be planned. 4. Preservation and application should be considered together, and obtaining a means of living for regional residents and creation of economic profits should be considered together. 5. Land application and approach method by usages (integrated management model) should be applied to utilize and manage flood plain efficiently. 6. Flood plain application programs should be designed reflecting opinions of regional residents. 7. With respect to space planning of flood plain, introduction of facilities focused on ecosystem preservation/ecosystem restoration/experiences/observation/learning/culture/ recreation/water purification could be reviewed positively.

• Journal of the Korean Home Economics Association
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• v.38 no.11
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• pp.105-114
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• 2000

The purpose of this study was to investigate the wearing satisfaction of highschool girls’summer uniforms, and to evaluate the comfort-related properties of fabrics used in the uniforms. The subjects were 441 female high school students attending three different schools in Chongju city. The data was collected using self-administered questionnaires to measure the wearing satisfaction of summer school uniforms. Factor analysis, t-test, and F-test were used for data analysis. The heat and moisture transfer properties and air permeable properties of their fabrics were evaluated to measure as comfort-related properties. 1. Most students were wearing blouses made of polyester/rayon blended fabrics and skirts made of 50% wool and 50% polyester blended fabrics. 2. Clothing care and management, and appearance of summer school uniform were assessed positively, while style and design, and the level of comfort were assessed negatively. 3. The subfactors of wearing satisfaction varied according to school, style and design, and fabrics of high school girls’summer uniforms. 4. PET fabrics were rated as having a lower value of thermal retention and a higher value of air permeability than other blouse fabrics. 5. There were not differences significantly in thermal properties according to skirt materials.

• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.490-494
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• 2005

Multispectral image is wavelet trans formed and classified into one of three classes considering reference characteristics of the subband with the lowest resolution. Recently, aegis of authentitation and creator's copyright has become a matter of great concern by the diffusion of multimedia technique and the growth of the internet and the easily duplicated property of digital data. Consequently, many active researches have been made to protect copyright and to assure integrity by inserting watermark into the digital data. In this paper, watermark is repeated through the entire image and adapted to the content of the image.

• BMB Reports
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• v.31 no.2
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• pp.177-182
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• 1998

A pool of cis-acting hammerhead ribozymes randomized in their substrate recognition sequences was constructed. A variety of active cis-acting ribozymes which had various structures of stems I and III was selected from the pool by in vitro selection. The selected ribozymes were cloned and sequenced. The relationship between the cleavage efficiency and base-pairing in stems I and III of the selected ribozymes was investigated. The ribozymes with the smaller difference in folding energies between the active conformation and the stable but inactive conformation showed a tendency to have the better cleavage efficiency. The optimum length of stem I was 5 or 6 bases while the longer stem III, in general, appeared to be required for efficient cleavage. The specificity of the ribozyme reaction is discussed in terms of the length of stems I and III.

• Journal of the Korean Institute of Rural Architecture
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• v.5 no.3
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• pp.22-33
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• 2003

I recognized necessity of the space planning to three-generation dwelling because of preservation of wholesome society sense of values of the younger generation indicated often to the point at issue by the change to nuclear family of present and by way to hand down thought of respect for the aged which is our traditional public morals. I wish to present basic data for storage space planning that resident's request and consciousness are reflected in such background. I investigated records in general concept, which is utilization pattern of storage space to achieve the function of these culture intermediation. The object of research is three-generation dwelling, such as 3L-K and 3L-DK as national residences that appear most generally in chongju city. The method of research was question investigation method to write utilization actual conditions and requirement of storage space directly. So I proposed suitable planning to resident's life style analyzing frequency, percentage and average distribution. When supply apartment house hereafter, it should be reflected wide selection by resident's characteristic and needed systematic storage space planning in consideration of user mainly. Also continuous and diversified researches that can improve quality of residence are required.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04b
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• pp.649-651
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• 2000

Terrain Following 이란 가상환경 내에서 지형의 표면을 이동할 때 지형의 모양에 따라 자연스럽게 지표위를 이동할 수 있게 하는 기술로서, 이것을 위해서는 지표면상에서 움직이는 물체가 갖는 위치와 높이 정보를 매시간 알아내야 한다. 전통적인 접근방법은 지표면의 높이(z)가 일정하다고 가정하건, 일반적인 충돌 감지 알고리즘을 이용하는 것이다. 그러나 충돌 감지 알고리즘은 복잡하게 모델링 된 물체들간의 충돌을 감지하기 위해 고안된 알고리즘으로서 비교적 단순한 Terrain Following에 적용할 경우 불필요한 연산을 많이 하게 되어 오히려 시간적인 손실을 초래할 수 있다. 또한 Quadtree를 지형의 데이터의 표현에 적합하며 지형과 같은 벡터 데이터의 표현에는 적합하지 않다. 본 연구에서는 네비게이션시 발생하는 인접성에 기반한 지역 탐색 방법을 사용하여 실시간 계산을 좀 더 빠르게 처리할 수 있는 알고리즘과 자료구조를 제시한다. 이 방법을 사용하면 탐색과정에서 발생하는 비교 횟수를 크게 줄일 수 있어 실시간 네비게이션시의 탐색 성능을 향상 시킬 수 있다.

• The Korean Journal of Quaternary Research
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• v.7 no.1
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• pp.41-68
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• 1993

In the loess-paleosol sequences from central Great Plains, U.S.A., variation in magnetic susceptibility, FD, NRM have been proven to be excellent proxy for paleoclimate, and the standard interpretation is that climatic processes have enhanced the rock magnetic intensities. By using mineral magnetic properties, we show the magnetic signal is due to pedogenesis during the warm and possibly wet interglacials and interstadials. Other proxy records, such as stable carbon isotope and phytolith, are in good agreements with the magnetic records.

• Journal of Engineering Education Research
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• v.15 no.6
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• pp.86-91
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• 2012

This paper has been studied to evaluate the program educational objectives (PEO) for mechanical engineering program at Chosun University. The program educational objectives were set up the educational goals with relationof college educational objectives and ability or quality of engineers after 3 years of graduation, and educated the basic competance of engineers are the equipments of high-level education enviroments, faculty and curriculum for effective engineering educations. This paper were to announce PEO to current students, to establish and to improve PEO throughout accesment and analysis of PEO evaluation. The improvement and documentation of PEO accesement system, collecton and analysis of PEO were conducted industial surveys for engineers graduated this program. The results are served as a substantial basis for setting furture educational goals, renewed PEO by the closed loop and making decision for quality of engineering education in the college of engineering. This study would be comfined measurements, analysis and achievements of PEO for graduated engineers in this program.

• Journal of Environmental Impact Assessment
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• v.13 no.3
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• pp.115-124
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• 2004

To utilize a closed municipal solid waste landfill site in environmentally secure conditions, it is necessary to verify the stabilization level of landfill leachate. To assess leachate stabilization of an open-dumping municipal solid waste landfill (Noeun Landfill) which is located at the upper drainage basin of Namhan River which flows into Lake Paldang utilized for Seoul Metropolitan water supplies, the surrounding characteristics of the landfill site was surveyed. After then, leachate, groundwater and soil samples from this landfill were chemically analyzed, and the analysis results were evaluated by "The Criteria of Landfill Waste Stabilization(CLWS)", "Discharge Criteria of Landfill Leachate", "The Criteria of Domestic Use in Groundwater Quality", and "Soil Contamination Criteria" promulgated by Korean Ministry of Environment. The closed open-dumping landfill was equipped with the final soil cover, 3 groundwater monitoring wells and poor landfill gas extraction devices for the post-closure management of the landfill. BOD/CODcr ratios in leachate were less than or slightly higher than 1/10. This results seemed to imply that the leachate stabilization level of this landfill based on the CLWS was almost completed. Qualities of groundwater sampled from monitoring wells located at outside of landfill were adequate for "The Criteria of Domestic Use in Groundwater Quality". Finally, concentrations of soil contaminants that were likely to be influenced by this landfill site were adequate to "Soil Contamination Criteria".