• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -2
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• pp.707-710
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• 2000

WWW(World wide Web) is a place where many laymen receive and send the information at the worldwide. A visualization of WWW is very important as one of functions helping to retrieve and browse the information. However, as the information volume displayed at one time is limited by a screen size, it is useful to limit the volume of information capable for users to browse. In this report, we propose the page-index, which extract its information according to degree of user’s interest. This index is a numbers, which relate the user’s interest with verbal and structural characteristics of homepages. The homage-index constructed with sequence of this index are useful to help a user’s browsing. We constructed the estimating system about an article of commerce and really tried to estimate. From this trial, we verified the usefulness of the page-index, homepage-index.

• 대한한의학원전학회지
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• 제21권2호
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• pp.125-143
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• 2008

Ujaegyeong(尤在涇) is a doctor of the Cheong Dynasty[淸代], whose works include "Geumgweyoryaksimjeon", "Shanghangwanjujip(傷寒貫珠集)", and "Uihakdokseogi(醫學讀書記)". Much research has been done on "Geumgweyoryaksimjeon" and "Shanghangwanjujip", but "Uihakdokseogi" has seen relatively little interest. This study aims to translate the first volume of "Uihakdokseogi" and compare the work with other literature in order to gain a better understanding of Ujaegyeong(尤在涇)'s medical theories and to review the viability of the said theories in practice. "Uihakdokseogi" is a casual work which mentions U's thoughts on various problems found through extensive studying or in practice. The book does not focus on a single topic. Thus, the spectrum of the work is broad and is filled with problems which would interest most medical professionals.

• 대한의용생체공학회:의공학회지
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• 제24권4호
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• pp.247-257
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• 2003

This paper proposes a three-dimensional (3D) segmentation algorithm for extracting a diagnostic object from ultrasound images by using a LoG operator In the proposed algorithm, 2D cutting planes are first obtained by the equiangular revolution of a cross sectional Plane on a reference axis for a 3D volume data. In each 2D ultrasound image. a region of interest (ROI) box that is included tightly in a diagnostic object of interest is set. Inside the ROI box, a LoG operator, where the value of $\sigma$ is adaptively selected by the distance between reference points and the variance of the 2D image, extracts edges in the 2D image. In Post processing. regions of the edge image are found out by region filling, small regions in the region filled image are removed. and the contour image of the object is obtained by morphological opening finally. a 3D volume of the diagnostic object is rendered from the set of contour images obtained by post-processing. Experimental results for a tumor and gall bladder volume data show that the proposed method yields on average two times reduction in error rate over Krivanek's method when the results obtained manually are used as a reference data.

• 디지털산업정보학회논문지
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• 제8권1호
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• pp.55-64
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• 2012

The advantage of direct volume rendering is to visualize structures of interest in the volumetric data. However it is still difficult to simultaneously show interior and exterior structures. Recently, cone beam computed tomography(CBCT) has been used for dental diagnosis. Despite of its usefulness, there is a limitation in the detection of interior structures such as pulp and inferior alveolar nerve canal. In this paper, we propose an efficient volume rendering model for visualizing important interior as well as exterior structures of dental CBCT. It is based on the concept of illustrative volume rendering and enhances boundary and silhouette of structures. Moreover, we present a new method that assigns a different color to structures in the rear so as to distinguish the front ones from the rear ones. This proposed rendering model has been implemented on graphics hardware, so that we can achieve interactive performance. In addition, we can render teeth, pulp and canal without cumbersome segmentation step.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 추계학술대회
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• pp.277-282
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• 2003

The growth-strain method was applied to cutout optimization in laminated composite plates. Since the growth-strain method optimizes a shape by generating the bulk strain to make the distributed parameter uniform, the distributed parameter was chosen as Tsai-Hill value. In this study, of particular interest is to see whether the growth-strain method developed for shape optimization in isotropic media would work for laminated composite Plates. In volume control of the growth-strain method, it makes Tsai-Hill value at each element uniform in laminated composite plates under the predetermined volume. The shapes optimized by Tsai-Hill fracture index were compared with those of the initial shapes for the various load conditions and predetermined volumes of laminated composite plates. As a result, it was verified that volume control of the growth-strain method worked very well for cutout optimization in laminated composite plates.

• 토지주택연구
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• 제14권1호
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• pp.33-46
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• 2023

본 연구는 코로나19 팬데믹 기간 동안 서울시 대규모 아파트단지를 대상으로 가격 영향 요인을 도출하고, 이질적 시장으로 인식되고 있는 강남권과 비강남권 지역의 차이를 비교하였다. 분석방법은 본 연구의 요약과 시사점은 다음과 같다. 첫째, 서울시 모형 분석결과 대규모 단지 아파트 가격의 변화는 기존 연구결과와 달리 아파트의 개별특성은 유의한 영향을 주지 않는 반면 거시경제변수인 이자율과 통화량에 의해 영향을 받는 것으로 나타났다. 한편, 이자율과 총통화량 변수의 단위를 고려했을 때 두 변수들이 아파트 매매가격에 영향을 미치는 정도가 매우 높은것으로 판단된다. 둘째, 강남권 모형 분석결과 서울시 전체 모형과 같이 아파트 가격의 변화는 이자율과 통화량에 의해 크게 영향을 받으며, 세대수와 평균면적이 클수록 아파트가격은 높아지는 것으로 나타났다, 셋째, 비강남권 모형 분석결과 또한 이자율과 통화량에 의해 아파트가격이 크게 영향을 받는 것으로 나타났으나, 강남권 모형과 달리 미시특성변수 중 지하철역과의 거리, 용적률이 매매가격에 영향을 주는 것으로 나타났다. 마지막으로, 세 모형 분석결과 이자율과 통화량이 공통적으로 아파트가격 변화의 주요한 영향요인으로 나타났으나, 비강남권 지역의 대규모 단지 아파트가격이 이자율과 통화량의 변화에 보다 민감하며, 이에 비해 강남권 지역의 아파트가격은 이들 변수에 대해 둔감하게 반응하는 특징을 보여주고 있다.

• 아태비즈니스연구
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• 제5권1호
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• pp.33-41
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• 2014

Since depositors are motivated by returns, it is important for Islamic banks management to understand the extent that rates of return on deposits influence their customers' decision to deposit. The main objective of the study is to explore the degree of influence of conventional bank's interest rate on Islamic bank's profitability and vice-versa. It has been seen from 2005 to 2011 that the rate of interest declared on deposit by conventional banks has a negative impact on profitability of both types of banks in Bangladesh. Rate of profit declared on deposit by Islamic banks is positively related with their profit earned but negatively related with profit earned by conventional banks. We see that rate of interest declared on deposit by Conventional Banks is positively related with their deposit volume but negatively related with Islamic Bank's deposit. On the other hand, rate of profit declared on deposit by Islamic Banks is negatively related with deposit levels of both types of banks. The survey result shows that almost 85% of the respondents are choosing Islamic banks only from their religious point of view and more than 60% of the sampled Islamic bank customers are reluctant to leave the bank even if conventional banks offer better interest rates.

• Journal of Power Electronics
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• 제11권5호
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• pp.621-631
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• 2011

In space qualified DC-DC converters, optimization of the following electrical characteristics is of greater interest in comparison with other specifications; power loss/efficiency, output voltage ripple and volume/weight. The main goal of this paper is to present an appropriate solution for optimizing the above mentioned characteristics. For this purpose, a comprehensive power loss model of a DC-DC converter is fully developed. Proper models are also demonstrated for assessment of the output voltage ripple and the utilized transformer volume as the bulkiest component in a DC-DC converter. In order to provide a test bed for evaluation of the proposed models, a 50W push-pull DC-DC converter is designed and implemented. Finally, a novel cost function with three assigned weight functions is proposed in order to have a trade-off among the power loss, the output voltage ripple and the utilized transformer volume of the converter. The cost function is optimized for applications in which volume has the highest priority in comparison with power loss and ripple. The optimization results show that the transformer volume can be decreased by up to 51% and this result is verified by experimental results. The developed models and algorithms in this paper can be used for other DC-DC converter topologies with some minor modifications.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2002년도 창립 20주년기념 국제학술대회
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• pp.229-238
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• 2002

The calculation of earthwork plays a major role in plan or design of many civil engineering projects, and thus it has become very important to improve the accuracy of earthwork calculation. In this paper, we propose an algorithm of finding a cubic spline surface with the free boundary conditions, which interpolates the given three dimensional data, by using B-spline and an accurate method to estimate pit-excavation volume. The proposed method should be of interest to surveyors especially concerned with accuracy of volume computations. We present some computational results showing that our proposed method provides good accuracy.

• International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers
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• 제5권1호
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• pp.40-45
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• 2002

The calculation of earthwork plays a major role in the planning and design phases of many civil engineering projects, such as seashore reclamation; thus, improving the accuracy of earthwork calculation has become very important. In this paper, we propose an algorithm for finding a cubic spline surface with the free boundary conditions, which interpolates the given three-dimensional data, by using B-spline and an accurate method to estimate pit-excavation volume. The proposed method should be of interest to surveyors, especially those concerned with accuracy of volume computations. The mathematical models of the conventional methods have a common drawback: the modeling curves form peak points at the joints. To avoid this drawback, the cubic spline polynomial is chosen as the mathematical model of the new method. In this paper, we propose an algorithm of finding a spline surface, which interpolates the given data, and an appropriate method to calculate the earthwork. We present some computational results that show the proposed method, of the Maple program, provides better accuracy than the method presented by Chen and Lin.