The problems of various research fields such as molecular modeling may be represented as circles with inclusion relations. Given n circles in the plane, the recognition of inclusion relations for a set of circles can be a tool to reason about geometric problems on 2D. In this paper, we introduce O(nlogn) algorithm to find these relations for the circles and this algorithm make possible maintaining the geometric data hierarchy in the geometric data processing aspect.

We propose a new algorithm for a classical problem in the planer computational geometry: computing a shortest path between two points in the presence of circular obstacles. Proposed algorithm actually computes a path tree that encodes a shortest path between given two points. Types of path are defined as a tangent line segment between circles, between point and circle, or as an arc. Using circle set voronoi diagram, geometric information that is very useful to search circles is obtained. The key of proposed algorithm is the reduction of the number of circles to need for constructing path tree. The main advantages of our algorithm are its robustness, speed, and the simplicity in implementation.

Presented in this paper is an algorithm to compute a Voronoi diagram of circles in a circle, where circles are located in a large circle. Given circles in a large circle, the region in the plane is divided into regions associated with the given circles. The proposed algorithm uses point Voronoi diagram, and then some topological remedies are applied so that we obtain proper initial topology including enclosing circle. From this initial topology, we can obtain the correct topology by a series of edge-flip operations. After getting the correct topology, the equations of edges are computed and represented in a rational quadratic Bézier curve form.

연계논문 에서는 해양환경하중을 받는 스틸자켓의 기하학적 비선형을 고려한 정적 동적해석을 위한 유한요소 정식화 과정을 제시하였다. 또한, 스틸자켓의 극한거동을 추적하기 위하여 뼈대구조의 소성힌지 해석법을 적용하였다. 본 연구에서는 스틸자켓의 통합해석 프로그램 OSA2000을 개발한다. 연계논문에서 제시된 주처리 프로그램의 내용을 제외하고, visual basic과 OpenGL 그래픽 라이브러리를 사용하여 데이타 입력을 효과적으로 수행하기 위한 전처리 프로그램과 해석결과 분석을 위한 후처리 프로그램을 개발한 내용을 요약한다. 또한, 다양한 예제해석을 통하여 프로그램의 검증 및 해석결과를 제시한다.

The bureaucrat-scholars, ruling class of the Choseon Dynasty, used to build small private pavilions for rest and study for themselves. In the early period of the Dynasty, the pavilions had plain shapes with rectangular plan and simple wooden structure without any walls so as to enjoy the surrounding scenery. From the 16th century, the building form began to change into some diverse one by putting in an ondol room, an unique floor heating equipment. The pavilions also began to show regional differences by placing the ondol rooms in the floor. Myonang-jong, a pavilion occupied by a famous bureaucrat-scholar Song Soon, was built at Damyang of the southwest part of the Korean peninsula, so called Honam area, in 1533. At first, the building form followed the ordinary early pavilion shape using simple wooden structure and wooden floor. But when it was rebuilt in 1654 after burning down by war, there happened some changes. An ondol room was put in the center of the floor, of which regarded as a dominant regional characteristic of the Honam area. The change of the building form of Myonang-jong showed that it was the 17th century Honam area got the regional characteristic in the architecture of pavilion.

The urban form of Korean cities significantly changed in the late Chosun dynasty. The influence of commercial development was the main cause of these changes. Commerce became a important function of existing cities, and the new type of commercial towns emerged at the important spots of traffic routes. In both cases streets became dominant element of urban form. Mainly commercial buildings aggregated along the streets, and to obtain higher land use intensity shape of lots became narrow and deep. Koyang(高陽) shows the most significant example of this new type of lot and lot pattern. Approximately 30 narrow and deep type of lots lined on each side of street forming about 390 meters long linear commercial town. Similar examples were found at the outside of south gate of Suwon(水原), Nuwon(樓院), and Pangyo(板橋).

단결정 Si(100) 기판과 비정질 Si 기판위에 Co/Zr 이중층을 이용하여 형성시킨 Co 실리사이드의 성장 거동에 대하여 연구하였다. 전자빔 증착기를 사용하여 단결정과 비정질 Si 기판위에 Zr 50Å과 Co 100Å을 차례로 증착한 박막을 500˚C부터 800˚C까지 100˚C 간격으로 질소 분위기에서 30초 동안 급속열처리를 하여 Co 실리사이드를 형성시켰다. 각 온도에서 열처리된 시편의 상형성, 화학적 조성, 계면의 형상, 전기적 특성을 XRD, AES, RBS, TEM, HRTEM 등으로 분석하였다. 분석 결과 CoSi2 상이 단결정 기판에서는 700˚C 이상에서 기판과 정합성장을 하였고 비정질 기판에서는 다결정 성장을 하였으며 Co 실리사이드의 상형성 온도는 단결정 기판에서보다 비정질 기판에서 100˚C정도 낮아졌다. CoSi2와 같은 Co rich 중간상은 두 기판 모두 형성되지 않았으며 초기 Co 실리사이드의 상형성 온도는 Co 단일층으로 상을 형성시킬 때 보다 더 높았다. Co 실리사이드와 Si 기판의 계면의 형상은 단결정 기판의 경우보다 비정질 기판에서 더 균질하였다. 박막의 면저항은 600˚C이하의 열처리 온도에서는 비정질 기판에서 형성된 Co 실리사이드 박막이 더 낮은 값을 나타내었고 그 이상의 열처리 온도에서는 단결정 기판에서 형성된 박막의 면저항값이 더 낮은 값을 나타내었으며 두가지 기판에서 형성된 박막 모두 800˚C에서 가장 낮은 면저항 값을 보였다.

It could be said that the Kyongbok Palace, the main palace of the Chosun Dynasty which built in the early years of the Dynasty, had two main architectural characters. One ; the entire building complex was arranged under the influence of ancient Chinese building principle based on the Confucian ideas. Two ; building compositions and shape of each buildings were succeeded from the palace of the former Koryo Dynasty, especially on the latter periods of it. The architecture of the Kyongbok Palace had formed its own uniqueness by developing these two characters.

There are two main halls in the Main Palace of the Koryo Dyansty in the 11th and 12th century. One, named Hoekyongjeon, was served only for special ceremony ; hundred Buddhist priests' sermons or receiption of Chinese emperor's letters. The other one, Kondukjeon, was used as ordinary throne hall. The ordinary throne hall was built when the palace was erected at the beginning era of the Koryo Danasty, while the special ceremony hall built after the reconstruction in the 11th century. The throne hall was located at northwest side of the special ceremony hall. Audience chamber and King's bedroom were located at west and northwest side of the throne hall. The basic layout of the Palace showed unsymmetrical shape. It seemed mainly effected by its undulating terraine. The acess road from main gate to the throne hall showed zigzag way, by following a stream penetrating the site obliquely, It could be said that the Main Palace of the Koryo Danasty achieved its originality on the aspect of unsymmetrical layout and zigzag acess road, which was not found in the former palaces.

Dosan Sedans was built in 1560, when Toege I Whang(1500-1571) was 60, as a place in which to study and teach disciples. The building was built to a humble 3-kan system which was a popular form of sodang in the 16th century, There found an enlargement of space by attaching outer walls around three sides which was designed by Toege himself. Minimum in space, moderation in form, conrol of embellishment, hermit scholar's aethetics became basic concept of the architecture of Dosan Sodang. After completion of sodang, Toege wrote many poems about pond, walls, flower bed and natural surroundings like sheer cliff, winding river and even rural daily life of villagers around the building. It could be sud that ,for Toege, architecture was cogniged as a whole complex of building and its surrounding natural, artificial and human circumstances.