우리나라 바람의 氣候學的 諸特性

李炳坤 慶北大學校 1984 論文集 Vol.37 No.-

The purpose of this study is to clarify some climatological aspects of winds in Korea using the wind statistics. The results are as follows: 1. The annual march of the wind velocity was presented using the mean value of every half decades. Types of the annual march are grouped into six: (1) Yellow sea side type (2) Korean strait side type (3) Donghae sea side type (4) Inland type (5) Highland type (6) Island type 2. In the number of days with wind velocity by class (1) Island, Yellow sea side, and Korean strait side type have high value in the occurrence freguency of days with daily maximum wind velocity of more than 10m/s, but Donghae sea side and Inland type show the low value. This fact means that it reflect well the effects of the direction of air flow into the Korea and topograpical features. (2) The scale of wind velocity corresponding to each number of days has some trends with the regional distribution of the occurrence frequency of daily maximum wind velocity of more than 10m/s. 3. The annual march of the daily variation in wind velocity could be classified into three types. (1) Ⅰ type: annual variation is more pronounced than daily variation. (2) Ⅱ type: daily variation is more pronounced than annual variation. (3) Ⅲ type: both daily and annual variation is pronounced. 4. In distributional characteristics of the monthly mean wind vector (1) The monthly mean value rotate, as a whole, conunterclockwise direction through the whole year. (2) In the case of east-west components of the monthly mean wind vector, Yellow seside, Korean strait side and Inland show the high value of west wind components, while Donghe sea side shows the high value of east wind components. (3) Especially it is noted that the components of north-west wind and south-east wind are extremely weak.

컴퓨터 Vision을 위한 3차원 Range영상 분할 및 식별

황병곤,임은복 대구대학교 산업기술연구소 1989 産業技術硏究 Vol.8 No.-

In this paper, 3-dimensional object segmentation and classification is proposed. Planar object is segmented using jump and internal boundaries. Curved object is segmented using clustering method. Segmented surfaces are classified by using curvature functions and angle mesurement of normal vectors. These procedures have bee successfully applied to the synthetic range images and shows good classified.

상황의 객체 지향적 시각화

황병곤,정성호,김석현 대구대학교 과학기술연구소 1996 科學技術硏究 Vol.3 No.1

The object oriented visualization of situations is an essential component part in many applications. We simulated spatial moving objects of situation using multi-media environment. An object is composed of multimedia datas that can express graphic and sound. By composing these objects we can have group cbject. Also, we can execute event by defining stuations that are occured according to be animating object.

프랙탈 모델링 기법을 이용한 지형 생성 데이타 구조

김병철,김응곤 順天大學校 1994 論文集 Vol.13 No.1

□By far the most efficient technique of fractal based algorithms for artificial terrain generation is recursive midpoint subdivision. Existing polyhedral data structures implementing the technique are inadequate for maintenance of consistency as polygons are subdivided. A new data structure is presented which provides for the efficient use and consistent storage of spatial data. The data structure is applicable to polygons of any order and allows neighboring polygons of different order to be stored and subdivided.

大邱市 冬秀氣溫의 分布에 關한 硏究

李炳坤,金日坤 慶北大學校 1977 論文集 Vol.23 No.-

This is a succession to the study on the distribution of summer air temperature, as referred to in the introduction. And this study equals the former one in the methodology, but is concerned with the case in winter season the horizontal distribution of winter air temperature in Daegu city. The results of this study can be summarized as follows; 1. The horizontal distribution of winter air temperature says that (1) In the early morning, the air temperature as a whole has larger (-)deviation with the distance from the urban center, excepting the northern industrial complex and the southern denser residantial area. Their air temperature is highest, particularily in the coldest month, January. This may result from the artificial heat radiation. (2) In afternoon, the average temperature both in every month and all three months (winter season) is marked by being still higher in route R 3. In addition, it has more dominant (-)deviation as the distance from the urban center increases. This also results from the increase of artificial heat radiation, which is caused by that increase of the density of human activities and of traffic in the study area through this period. (3) In the distribution of air temperature by night is found that the (-)deviation showes the greatest this time through the whole day. (4) Overall, average daily air temperature demonstrates the typical phenomenon of the distribution of urban air temperature. 2. In the cases of daily air temperature (1) The temperature range in horizontal dimention by every measurement time is greatest during the night. and that of early morning time and afternoon time is about the same eath other. (2) Daily range of air temperature increases as the distance does from urban center to suburbs, which supports the increasing mildness phenomenon in urban air temperature.

韓國 主要都市의 都市氣候學的 考察

李炳坤 慶北大學校 1976 論文集 Vol.21 No.-

The phenomena that many populations and industries come to th major cities cause various problems. The urban climate is one of these examples. Presented in this paper are the tendency of changing in passing every year about the three elements: temperature, wind, humidity to examine closely the phenomena of major urban climate in Korea and urban climate having influence on population and inhabitant's environment. It's result is like following. 1) The phenomenon of a high temperature (Heat island) amomg the urban climate characteristics was remarkable. 2) The urban climate is essential part the pollution of atmosphere. 3) The lack of insolation and illumination has a big bad influence on the health of the city people. 4) The low humidity in urban increases dangerous degree in causing a fire. The specific features of changing of the elapse of every year about the climatic elements in korean major cities are as follow. 5) Temperature change is very notable, especially the lowest average temperature and winter average temperature showes the tendency of the most outstanding increase. 6) The annual average of wind velocity does not show the decreasing tendency but the average of highest wind velocity showes that of decrease. 7) Annual average and seasonal average of humidity does not show any decreasing tendency.

Range 影響에서 面特性에 의한 3차원 物體認識

황병곤 대구대학교 (한사대학) 산업기술연구소 1988 産業技術硏究 Vol.7 No.-

In resent year there has been a tremendous increase in computer vision research using range images (or depth maps) as sensor input data. The most attractive feature of range images is the explicitness of object surface information. Then B-splines and surface curvature are used for the characterization of the object surface. In this paper, 3-D object shapes are extracted using point orientation for planar surface and surface curvature histogram for curved surface. Matching technique by EGI is proposed for the noisy range images.

等價回路를 利用한 Bilinear Switched Capacitor 濾波器의 實現

황병곤 대구대학교 산업기술연구소 1984 産業技術硏究 Vol.3 No.-

In this paper, design procedures for bilinear SC filters and their Z-domain equivalent circuits have been given. The new topologies have transfer characteristics that very accurately approximate the ones of active RC filters. The transfer functions are translated by equivalent circuit. Furthermore, the bilinear SC filter using bilinear S-to-Z transformation have low sensitivity and high stability. Overall experimental circuits of this paper can be implemented to one-chip IC.

韓國의 氣象災害 地域區分 : 實態分析과 地理的 分布를 中心으로

李炳坤,金日坤 慶北大學校 文理科大學 1978 文理學叢 Vol.5 No.-

In this paper the author investigated the actual conditions and geographical distribution of meteorological disasters which were occured during the past from 1904 to 1970 in Korea. The results are summarized as follows: (1) The degree of meteorological disasters in Korea ranks high level in the world. Also it seems that national development was impeding remarkably by these disasters. (2) It was found that the depth of demage, the frequeucy of occurence, the contents of various kinds of meteorological disasters vary in different localities. (see Table and Figure) (3) As a result, Korea is divided into six meteorological disaster regions according to the frequency of occurence by various kinds of meteorological disasters. 1) North-West Coast Disaster Region. (Seoul, Incheon) 2) North-East Coast Disaster Region. (Daegu, Jeonju, Gwangju, Chupungryeong) 4) Southern Coast Disaster Region. (Busan, Yeosu, Mogpo, Jeju) 5) South-East Coast Disaster Region. (Pohang, Ulsan) 6) Ulreungdo Disaster Region. (Ulreungdo)

컴퓨터 影像認識을 위한 影像分割 선택의 한 方法

황병곤 대구대학교 산업기술연구소 1987 産業技術硏究 Vol.6 No.-

A recursive technique for multiple threshold selection of computer images is described. Image pixels are first classified as edge pixels or nonedge pixels. Thus edge pixels are classified as dark, gray and bright pixels. Histogram of dark edge pixel and bright edge pixel are obtained. A threshold is selected corresponding to the graylevel value corresponding to one of the highest peaks from the two histograms. To get required segmentation images, the threshold selection is applied by recursive procedure.