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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.
서상근,김은수,장병순 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.59 No.-
최근 고속도로 교량이나 입체교차로등에 평면곡선보의 사용이 증가하고 있다. 구조적인 복잡함 때문에 곡선교는 휨응력 뿐만아니라 비틀림응력까지 받게 된다. 통상적으로, 곡선교는 휨비틂이론으로 해석되는데 곡선교의 해석에는 ��綢늣염倖�무시한 보이론과 ��綢늣염倖�고려한 보이론이 있다. 본 논문에서는 ��綢늣염倖�고려한 휨비틈이론에 기초를 두고 단순지지 곡선보의 단면력과 변위를 결정하고 에너지법을 사용하여 2경간 연속 곡선보에 대한 탄성방정식을 유도하였다. 또한 실하중을 받고 있는 2경간 연속 곡선보의 단면력과 변위를 구하였다. The use of horizontally curved girder bridge has increased considerably for highway bridge and interchanges. Due to the geometric complexities, curved girder are subjected to not only flexural stresses but also significant torsional stresses. Usually, a curved girder is analyzed by the flexural torsional theory. There are several theories which are available for the analysis for the curved girders ; beam theory ignoring the warping-torsional effects and beam theory considering the warping torsional effects. In this paper, the stress resultants and displacements of simply supported curved girder based on the flexural torsional theory considering torsional warping effects are determined. And elastic equations of two-span continuous curved girder are obtained by using energy method. Also, bending moment diagram, warping moment diagram, torsional moment diagram, shearing force diagram, and deflection diagram of two-span continuous curved girder bridge applying vertical loads and uniform loads are presented.
서영수,이상봉 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
PSPICE is not offered a library of mechanical factor like DC Motor, Induction Motor which is needed in Power Electronics field. Therefore, Induction Motor was made library by Equibalent circuit in this study. This model is applied in Voltage-Type inverter and is investigated its characteristics. IGBT is tested by two methods of Macro and Micro Modeling as semiconductor. PWM signal is used of pulse signal. Voltage and current, speed, torque was simulated for assurance of model.
[논문]지적경계 불일치의 개선방안에 관한 연구 -주민과 전문가 의식 조사를 중심으로-
서갑수,이성호 釜山大學校 都市問題硏究所 2004 都市硏究報 Vol.16 No.-
Initially, cadastre of South Korea has begun in 1910's However, some problem are followed by lack of repletion and development of the system now. Especially, there is no solution about the problem of cadastral inconistence under the present condition. This study was conducted a survey of consciousness concerning boundary. This study aims at presentation of an obectice index of policy establishment, and furnishing accurate data through surveying of consciousness about cadastral boundary of residents and cadastral specialists.
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.
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.