이동 열원을 고려한 전자빔 용접의 유한요소해석

조해용,정석영,김명한,조창용,이제훈,서정 한국레이저가공학회 2001 한국레이저가공학회지 Vol.4 No.1

Simulation on the electron beam welding of Al 2219 alloy was carried out by using commercial FEM code MARC, which encounters moving heat sources. Due to axisymmetry of geometry, a half of the cylinder was simulated. A coupled thermo-mechanical analysis was carried out and subroutine for heat flux was substituted in the program. The material properties such as specific heat, heat transfer coefficient and thermal expansion coefficient were given as a function of temperature and the latent heat associated with a given temperature range is considered. As a result, the proper beam power is 60kVX60mA and welding speed is 1~1.5 m/min. The residual stress in the heat-affected zone as well as the fusion zone does not increase. It is necessary to use jigs for preventing distortion of cylinder and improving weld quality.

한국 씨름과 일본 스모(相撲)의 비교연구

조재기,손명준,박철민 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4

Any nation of the world has its own culture of physical activity in form of fighting that has been uniquely developed andsucceeded. Physical activity in form of fighting is the oldest type of sport. Wall paintings which illustrated fighting and wrestling figures are found in the remains of ancient Egyptian, Niespotamian, Indian and Chinese cultures. Such activity lost its original nature gradually over time, was transformed into a game as contending for victory. It becomes a seasonal practice now(Lee Jae Flak, 1998:5-11). Since the start of the modern times, Sirumhas been formalized, systematized and developed into a game as relevant new rules have been created and prevailed. Similar types of Sirum have been practiced and developed by different nations of the world in different ways. Sumo is the national sport of Japan and is greatly supported by the nation. Topped among Japanese professional sports, Sumo is exciting the island nation as a whole and very much loved by Japanese people( Kim Ok Hee et al., 1998:1-4). Started together with Korean professional Sirum almost simultaneously, Korean professional baseball, soccer and basketball games have been firmly established in this nation and are now globally advanced with good performance in A-class international matches. In contrast, Korean professional Sirum is still far behind other professional sports in regard to game operation and active engagement by spectators. Now it is necessary to make best efforts of setting foundations for the activation and promotion of this nation's professional Sirum through a better preparation of game rules for attracting more spectators, establishment of systems for reasonable management and operation and a Letter education and training of professional Sirum players and instructors, under the motto of the right succession and restoration ofsuch traditional cultural asset(Oh Beom Tae, 1999: 11-23).

해양 레저스포츠 관광상품화 개발을 위한 대학과 지방자치 단체간의 커뮤니케이션 모형개발(Ⅰ)

조재기,신영균,손명준 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.6

This study utilized antecedent studies and statistics made by local governments and other public organizations in order to obtain objective data necessary for the development of marine-leisure tourism products, and adopted related literature research and descriptive analysis as its primary method of data analysis. Based on the primary research, case study by means of field study in advanced countries was adopted in the stage of the secondary research, which aimed to draw inductive reasoning necessary for understanding the circumstances of commercializing marine-leisure sports tourism. The tertiary analysis intended to understand policies related to marine-leisure tourism product development and to design a tourism product, which takes B! usan as its model. The research results are as follows: 1. It is necessary to construct sustainable and organized policies and systems after the public hearing led by the local government and supported by local universities throughout the whole process of developing a marine-leisure tourism product so that the concept of sustenance can be applied. 2. In order to judge and measure the potential for sustainable development of marine-leisure tourism, an index of sustainable tourism should be developed by academic institutes like universities. 3. An event to publicize investment opportunities in marine-leisure tourism should be held under the joint sponsorship of local governments and universities so that enterprises at home and abroad can take interest in investment and further move on to sign an MOU. 4. As past tourist attraction development caused damage to natural environment and ignorance of profitability, the direction of the future marine-leisure tourism development should be separated into the tourism product developmenmt and tourist attraction development. 5. An academy to train professionals in the field of marine-leisure tourism should be established by the joint supervision of the local government and universities. 6. Korean-style marine-leisure sports should take root in the social system and be standardized. 7. Marine-leisure sports should take root in the social system and be standardized. 8. Tourism products using large-scale cruisers should be developed. 9. Coastal cruise course should be developed.

개에서 발생한 추간판 탈출증의 수술적 치료 1례

조재금,이재연,정성목,김명철 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2011 動物醫科學硏究誌 Vol.18 No.1

Seven-year old, castrated male pekingese was presented with sudden onset of pain and tetraparesis. He was diagnosed with multiple intervertebral disc disease (lesion: C6-7 [mild], T12-13 [mild], L2-3 [moderate] via MRI in 2006. After undergoing conservative therapy at local hospital, he had more severe symptom in December 2009 than before. In order to identify exact site, he had been taken second MRI and transferred to CNU VMTH. Definitive diagnosis is also multiple intervertebral disc disease (IVDD) with the same lesion except C3-4 (+++). The spinal cord between C3 and C4 is ventrally compressed by intervertebral disc and the compression is much more severe than other lesions. Since the symptoms were severe and took place rapidly and didn't respond to medical treatment, surgical treatment, ventral slot for new lesion(C3-4) was planned. After the ventral compression of spinal cord between C3 and C4 was achieved, he showed enhancement which is gradual return to normal neurologic response, sternal recumbency, and occasional standing. After postoperative treatment at local hospital, he fully recovered to the normal. It was considered that accurate diagnosis timely adequate treatment are essential for the cure of IVDD.

서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)

김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2

Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.

무선 ATM에서의 효율적인 자원할당 알고리즘

최명렬,조태경,권재우 漢陽大學校 工學技術硏究所 2000 工學技術論文集 Vol.9 No.1

본 논문에서는 셀을 섹터로 구분하고 이동국이 어느 섹터에 위치하는가를 추정하여 핸드오버할 확률이 가장 높은 최인접셀을 정하므로써 효율적인 대역폭 할당을 할 수 있는 핸드오버 알고리즘을 제안하였고, 서비스 트래픽을 실시간과 비실시간으로 구분하므로써 무선 멀티미디어 환경에 알맞은 대역폭 할당을 가능하게 했다. 또한 이에 적합한 무선 MAC프로토콜을 제안하여 구현하고자 하는 무선 ATM환경을 보다 구체적이며 실제적으로 나타냈다. 본 논문에서 제안한 알고리즘은 기존의 핸드오버 알고리즘과 SMPL로 비교 시뮬레이션하여 성능을 검증해 보았다. We propose the handover algorithm considering the position of mobile terminal and determining the most adjacent cell with the highest probability of handover. The proposed algorithm can make a effective bandwidth allocation and may be applicable to the condition of wireless multimedia. In addition, the proposed algorithm is considered efficient wireless MAC protocol. The simulation results of the proposed algorithm show better performance in both blocking probability and handover probability than conventional one.

人蔘多糖類의 理化學的 特性에 關한 硏究 : 人蔘貯藏加工中 澱粉의 理化學的 特性變化 Change of physicochemical properties of the starch during storage and heat treatment

曺哉銑,吳成基,曺羊嬉,金海中,黃明浩 경희대학교 부설 식량자원개발연구소 1985 硏究論文集 Vol.6 No.-

In order to investigate the change of physicochemical properties of ginseng root starch during storage and heat treatment. the roots were stored for 15 days at 5℃, 15℃, 30℃ and 45℃, and heated for 15 hours at 60℃, 70℃, 80℃, 90℃, respectively. The starch content was decreased from about 40% to 23-26% and sucrose content was increased from 4% to 12-16% during storage for 15 days at 5-45℃. Maltose, which was not detected in fresh samples, was increased upto 8.5% during storage or heat treatment. Granular size of the starch was decreased and some of the granules were broken during storage. Amylose content in the starch was decreased from 33% to 20%, and blue value and alkali number of the starch were increased slightly, and solubility and swelling power of the starch were decreased during storage. The higher storage temperature and the longer storage time, the starch was more susceptible to gelatinize, and the viscosity of the starch was lowered with the susceptibility of gelatinization. The susceptibility of degradation of the starch by the amylase was increased and amylolytic activities in ginseng root were, also, increased during storage.

개에서 결직장 연접부의 림프종 1례

이재일,이수진,김영석,김명진,조성환,신상태,이영원,김명철 충남대학교 수의과대학 동물의과학연구소 2003 動物醫科學硏究誌 Vol.11 No.-

A five years old female Shih-tzu was referred to the veterinary medical teaching hospital at Chungnam national university with soft bloody diarrhea and tenesmus. On rectal palpation, solid mass was palpated in colorectal region. In radiographs, small intestine was deviated cranially, descending colon and rectal junction were deviated caudoventrally in lateral projection of the abdomen. In ultrasonographs, hypoechoic nodulation of mesenteric lymph node in colorectal junction, mixed echoic thickening of colorectal wall and irregular margination were observed. Rectal endoscopy revealed that colorectal men was partially obstructed due to compression of the mass. Also, severe ulceration, inflammation and hemorrhage were also observed in descending colon. The mass was resected through the laparotomy. In histopathology, it was diagnosis of lymphoma in the colorectal junction.

양전자방출단층촬영을 이용한 초점주의와 작동기억의 뇌 활성화 양상 비교

김재진,조상수,김명선,손정우,이재성,이동수,이명철,권준수 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.2

연구목적: 단순 초점주의 과제와 보다 고도의 집중을 요하는 작동기억 과제를 수행하는 동안의 뇌 활성화 양상을 비교하여, 두 인지기능 과정을 매개하는 정상적 신경회로의 특성과 차이를 알아보는 것을 목적으로 하였다. 방법: 정상인 14명을 대상으로 시각처리 대조 과제, 단순 초점주의 과제, 작동기억 과제 등 세 가지 인지과제를 주고, 과제 수행 동안 [□O]H₂O를 추적자로 한 양전자방출단층활영을 실시한 후 감산분석을 통해 초점주의와 작동기억의 신경회로 지도를 작성하여 비교분석하였다. 결과: 초점주의 동안 활성화되는 부위는 좌측으로 편측화되고 산발적으로 분포하는 양상이었고, 특히 전대상이랑과 운동영역을 포함한 전두엽, 일차 및 이차 시각피질 등의 활성화가 특징적이었다. 작동기억 동안의 뇌 활성화 역시 산발적 분포와 좌측 편측화 양상이 관찰되었으나, 시각피질보다는 전두엽의 활성화가 우세하였고, 특히 우측 전대상이랑의 현저한 활성화가 특징적이었다. 결론: 초점주의와 작동기억은 개념적으로 공통점과 차이점을 내포하고 있는 것처럼 매개 신경회로에서도 공통 혹은 특이한 영역을 각각 가지며, 전대상이랑의 역할이 두 기능에 공통적으로 중요하고, 이차 시각피질과 전전두피질이 두 기능 각각에 더 중요하게 작용하는 것 같다. Objectives:This study was undertaken to identify neural substrates for simple focused attention and more highly-focused working memory i normal people and investigate their characteristics and differences. Method: Fourteen normal subjects were studied with [□O]H₂O positron emission tomography during a visual processing baseline task, simple focused attention task and working memory task. Results were analyzed with the subtraction analysis to map the neural correlates of focused attention and working memory. Results: Activated areas during focused attention tended to be lateralized to the left and scattered over various regions including the anterior cingulate, motor area, and primary and secondary visual cortices. While the areas activated during working memory also show the left lateralization and scattered distribution, activation prevailed more in the frontal lobe than in the visual cortex, and was particularly remarkable in the right anterior cingulate. Conclusions: Focused attention and working memory do not have only conceptually commonalities and differences but also have common and specific areas in their neural substrates. The anterior cingulate may commonly play an important role in both cognitive functions, whereas secondary visual cortex and prefrontal cortex seem to be predominantly implicated in each function, respectively.

네트워크 및 TCP 분석을 통한 TCP 공정성의 향상

이정재,채현석,조태경,최명렬 漢陽大學校 工學技術硏究所 2002 工學技術論文集 Vol.11 No.-

TCP Vegas는 TCP Reno에 비해 안정적이고 이로 인해 네트워크 자원을 보다 효율적으로 이용할 수 있다. 그러나 두 버전이 같이 사용되는 경우 TCP Reno에 비해 TCP Vegas는 일정하나 낮은 수준의 전송율을 보이고 있다. 본 논문에서는 TCP Reno와 Vegas의 공정성에 영향을 미치는 요소인 TCP Vegas의 알고리즘에서 사용하는 상수 요소인 α·β, TCP의 MSS, 라우터의 버퍼 크기에 의해 TCP Reno와 TCP Vagas의 공정성이 변화하는 모습을 시뮬레이션을 통해 확인하였으며, 이에 따른 향후 연구과제를 제시하였다. TCP Vegas are much more stable than those of TCP Reno, resulting in a much more efficient utilization of the network resource. But difference in performance in due to the fact that Teno vibrates in the high throughput level and Vegas almost stabilizes in the low level when those TCP versions are used in same network. We find out by simulation about α·β which is constant factor of TCP Vegas, MSS of TCP and router buffer size change the fairness of TCP Reno and TCP Vegas. So we proposed more studying about these factor which changes fairness of TCP Reno and TCP Vegas.