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공간정보를 사용한 다중분광 화상데이터의 영역분류에서 다층퍼셉트론 신경회로망과 촤대유사법의 성능분석
서상원,서용수 東西大學校 1997 동서논문집 Vol.3 No.1
본 논문에서는 통계적 분류방법인 최대유사 분류법(MLC: maximum likelihood classifier)과 신경회로망을 이용한 분류법인 다층퍼셉트론(MLP: multilayer perceptron)분류법간의 분류성능을 비교 평가하였으며, 또한 공간필터 처리와 공간 정보를 이용한 다중분광 화상데이터의 영역분류를 행하였다. 이 방법에서 영역분류는 분광정보 데역화상데이터와 공간정보 대역화상데이터를 이용한다. 공간정보 대역화상데이터는 3×3 영역의 화소들의 표준편차를 이용해 구한다. 부산지역에 대한 실제 인공위성 화상데이터인 Landsat TM화상데이터를 사용하여 MLP분류법과 MLC분류법의 성능을 비교한 결과 MLP분류법의 성능이 더 우수함을 확인할 수 있었다. In this paper, the performances between maximum likelihood classifier based on statistical classification and multilayer perceptrons based on neural network approaches were analyzed. A new category claxxification method of multispectral image data using spatial filter processing and spatial information is proposed. In this method, category classification was performed with image data of spectral information bands and image data of spatial information bands. The image data a spatial information band was produced from the standard deviation of pixels in a 3×3 image region of the original image data. Experimental results from both neural network method and statistical method are presented, and the approaches are compared and analyzed based on these results.
서상수,김은기 한밭대학교 생산기반기술연구소 2002 생산기반기술연구소 논문집 Vol.2 No.1
In this paper, we have designed and simulated a new PMTUD(path MTU discovery) method. In traditional PMTUD method (RFC-1981), the sender transmits a packet with a MTU to the destination link. Then the packet is forwarded to the destination. During forwarding operations, if the packet is larger than the MTU of destination link, then the router send ICMP error message to the sender. The sender retransmit packet with the indicated length. These procedures are continued until the source finds the PMTU. This method has a drawback that the time needed to find a PMTU is long. In proposed methods, the sender send packet with a small length regardless of the destination link MTU. The option field of this packet has a smallest MTU field, and the router changes this value if MTU of next hop is less than received value. Destination host replies with this value. After receiving the response message from the destination, the sender knows the PMTU. In this paper, we have presented a designed method and the simulated result.
徐相壽 충주대 2003 産業科學論文集 Vol.11 No.-
Laminated core type transformer is well known as a basic of distribution transformer. This paper present that is able to reduce deviation in design constant and it is available when these type transformer design as a useful reference.
서재범,강상희,이승재 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-
In this paper, an algorithm for fault location in Auto Transformer (AT) Feeding Railway system is presented. If a fault occurs at the AT feeding circuits of electrical railway system, it is very important to find fault location and to remove it immediately for the purpose of ensuring safety for transportation. Because the characteristics of reactance - distance are not linear, only using one terminal signals to give fault distance is difficult. In this paper, first, using the KVL, 4 voltage equation are obtained. Secondly, eliminatillg voltage a distance equation which consists of currents at rail and line parameters including mutual effects.
서정길,김종수,김용태,이경식,한성현 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
In this paper, we developed a Windows XP version off-line programming system which can simulate a track vehicle model in 3D graphics space. The track vehicle was adopted as an objective model. The interface between users and the off-line program system in the Windows XP's graphic user interface environment was also studied. The developing language is Microsoft Visual C++. Graphic libraries, OpenGL, by Silicon Graphics, Inc. were utilized for 3D Graphics.
서용진,정소영,박성우 대불대학교 2002 論文集 Vol.8 No.1
Optoelectronic characteristics of the superlattice as a function of deposition temperature and annealing conditions have been studied. The nanocrystalline silicon/adsorbed oxygen superlattice formed by molecular beam epitaxy (MBE) system. Consequently, the experimental results of superlattice with multilayer Si-O structure showed the stable photoluminescence(PL) and good insulating behavior with high breakdown voltage. This is very useful promise for Si-based optoelectronic and quantum device as well as for the replacement of silicon-on-insulator(SOI) in ultra high speed and lower power CMOS devices in the future, and it can be readily integrated with silicon ULSI processing.
Power-MOSFET를 이용한 가변 주파수 싸이크로콘버터에 관한 연구
서영수,김영춘,김성균 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-
Ordinary cycloconverters have been used for low speed apparatus due to the fact the their practical output frequency is limited to the range of from 1/3 to 2/3 of input frequency. With power converters are applied to various kinds of production line, there are increasing in load that have need of consecutive operation from low speed to high speed. thus, interests in power converter which is able to consecutive drive are increase. For forced commutated cycloconverter (FCC) which does not require a DC link and can be used with most AC loads type of variable frequency and be able to AC-AC direct conversion, we consider cycloconverter system that can control from 10[Hz] to 500 (Hz) Power-MOSFET. And this paper also shows the reduced effect of harmonics and the effectiveness of the proposed system, which are thoughly tested and proved through the experiments in the output frequency range of from 5[Hz] to 1.5[kHz].
하순에 발생한 우췌성상피세포암의 Karapandzic flap을 이용한 치험례
서경성,류동목,이상철,김여갑,이백수 大韓顎顔面成形再建外科學會 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.6
The verrucous carcinoma which was classified by Ackerman in 1948 is generally well differentiated and slow growing. After its radical surgery, it is rarely recurrent of carcinoma. Tobacco chewing is a most important factor in the etiology of these lesion. It frequently affect males over 55 year old age and usually appears on buccal and mandibular alveolar mucosa. The continuing effort by plastic surgeon to reconstruc lips successfully has been accompanied by numerous publications on the subject. More recent communications have dealt with modifications or refinements of existing procedures. In 1974, Karapandzic reported the use of arterialied flaps to reconstruct lips following excisions of cancers. We have treated 65 year old male patient rapid growing verrucous carcinoma on lower lip with Karapandzic flap. Postoperatively the results showed good prognosis. So we report the result of its treatment and case with review of literature.
석유화학 공단 주변 지역 SO_(2)의 계절별 변화 예측
서성규,이선원,이상득,박종혁 國立 麗水大學校 環境問題硏究所 1999 環境硏究論文集 Vol.2 No.-
This study focuses on the assessment of long-term So_(2) concentration around the Yochon industrial complex area using ISCLT model. ISCLT model has been officially authorized by the U.S. EPA. Yochon industrial complex was located around Kwang-yang bay. In order to simulate the prediction of long-term So_(2) concentration by ISCLT model and the application in Yochon industrial complex area, every point source was identified and applicability to this region was studied in detail. Long-term meteorological data were analyzed from 1995 to 1998. As the result of verification and calibration for the model accuracy. the conversion factor was 8.35. According to the analysis from 1995 to 1988 meteorological data in Yochon, west north west(WNW: 13), north east north(NEN: 1), and south(s: 8) direction were identified to be the most frequently occurred one whit its frequency. As the result of modeling prediction, SO_(2) concentration in Yochon petroleum industrial complex area was satisfied to Air Quality Standards.