SA 508 강 용접 열영향부의 미세조직과 충격인성의 상관관계

김상호,홍준화,김주학,권순주,이성학,강석영,오세진 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.4

In this study, microstructures of the heat affected zone (HAZ) of SA 508 steel were identified by Mo¨ssbauer spectroscopy in conjunction with microscopic observations, and were correlated with impact toughness. Specimens with the peak temperature risen up to 1350℃ showed mostly martensite, but the microstructures were not changed, much from the base metal because of the minor tempering effect when it was risen to 650℃ or 700℃. With the peak temperature risen to 900℃ over the A₃ temperature, the martensite fraction was reduced, while bainite or martensite island were formed because of the slow cooling from the lower austenite region. As the martensite fraction present inside the HAZ increased, hardness and strengths tended to increase, whereas impact toughness decreased. However, impact toughness of the subcritical HAZ with the peak temperature risen to 650℃-700℃ was seriously reduced after post-weld heat-treatment (PWHT) since carbide particles were of primary importance in initiating voids. Thus, the most important microstructural factors affecting impact toughness were the martensite fraction before PWHT and the carbide fraction after PWHT.

아급성 갑상선염의 임상적 고찰

홍기석,고창순,정준기,이홍규,김삼용,석창호,박성회,김용일 대한핵의학회 1978 핵의학 분자영상 Vol.12 No.2

저자들은 서울대학교 병원 내과에서 108례의 갑상선 침생검을 시행하여 8례(7.9%)의 아급성갑상선염을 진단할 수 있었다. 이를 임상경과, 갑상선기능 등으로 본 임상단계와 비교한 결과 다음과 같은 결론을 얻었다. Czernick 등이 시도하였던 임상단계와 침생검의 조직소견이 비교적 잘 대응하였다. 임상경과가 길거나 갑상선기능이 낮을수록 갑상선의 섬유화가 심하였고 여포성분의 감소를 보였다. 갑상선의 기능상태와 옥소섭취율 혹은 갑상선주사상의 섭취율은 역 상관관계를 보였다. 임상단계의 초기에 발견된 환자들은 기능항진증의 증상을 보였다가 기능저하증의 양상을 보인 후 회복되는 이형적인 경과를 보였다. 임상단게의 후기에 발견된 환자들은 4명중 3명이 기능저하증을 보였는데, 이는 경과로 보아 질환의 최종단계로 생각되었다. $quot; 8 cases of subacute thyroiditis was diagraiosed amormg 108 needle biopsy of the thyroid during the period from April 1976 to August 1978. Correlation of the histologic findings with the clinical staging proposed by Czernick was relatively well matched; cases with long clinical course or low thyroid hormone levels showed greater fibrosis and reduction of follicular elements in thyroid. Thyroid (131)^I uptake or the uptake as seen on the thyroid scanning correlated inversely with the thyroid hormone levels. The clinical course of the patients seen in their initial stage of disease followed the classical pattern; hyperthyroid-like, hypothyroid-like and recovery. 3 among the 4, who were seen in their later clinical course showed hypothyroidism, which seemed the final outcome of their diseases.

북한 “수령형상문학”의 역사적 변모양상 -1960∼1990년대 북한 서정시를 중심으로

김경숙 ( Kyeong Suk Kim ) 민족문학사학회·민족문학사연구소 2013 민족문학사연구 Vol.51 No.-

The history of North Korean literature greatly changes from the mid-1960s. Although socialistic realism literature based on Marxism-Leninism was at the center, soon the center was changed to Juche literature based on Juche ideology. Yet, the first subject to be embodied in literature from Juche literature is “Chief-shape literature” because North Korean literature functions as an ideological weapon that edifies and agitates North Korean people, and because the first principle of Juche ideology, the principal system of North Korea, is “loyalty toward the Chief”. In North Korean literature that actively reflects social, political transition and demand, although the same topic of “Chief-shape creation” is treated, the core contents embodied by poets are changed in each period depending on the transition of the policy of literature and arts of the party. First, during the period of “establishing prestige of the chief” (1966∼1972), they embodied “greatness of Kim Il Sung” through noble royalty and revolutionary family of Kim Il Sung. Second, within the overall period of “publicizing revolutionary aspect of the chief”(1972∼1989) (1) during the period of “dualizing revolutionary Juche”(1972∼1978), “prestige of the chief” and the “central leader of the party” were embodied. Especially, “Kim Jong Suk” was used to embody the “revolutionary family of Kim Il Sung”. (2) During the period of “forming the line of revolution”(1978∼1985), “revolutionary history of the chief” and the “wise leadership of Kim Jong Il” were embodied. Especially, “Kim Jong Il” was used to embody the “revolutionary family of Kim Il Sung”. (3) During the period of “raising a successor of revolution”(1985∼1989), “succession of Kim Il Sung`s revolutionary tradition through a successor” and the “great achievement and human presence of Kim Jong Il” were embodied. Third, during the period of “completing the great revolutionary family”(1989∼1994), the “greatness of Kim Jong Il was absolutized” and embodied, and the “feature of the chief fit for the principle of trinity” was embodied as well. As a result of tracing historical transition of “the Chief-shape literature” of North Korea, the author discovered the following conclusion and meaning. First, the fundamental reason for Korean Workers` Party in North Korea to concentrate on the problem of power succession while they could not establish further socialism and communism through the step of dialectical development between partisanship and loyalty to the party was because they considered that the “maintenance of the system” was the prime task within the confrontation between the South and the North with different systems. Second, the “poetic object” was mainly “naturalized” and the “method of poetic embodiment” was extremely “simplified” in North Korean poems within the period of Juche literature because literary imaginations disappeared. Third, the fact that there is no poem reflecting partisanship within the history of North Korean literature in the period of Juche literature is a counter evidence of isolation and dogmatism of the loyalty to the party.

김환기 작품세계의 전환 연구

김명숙(Kim Myeong-Suk) 명지대학교 문화유산연구소 2016 미술사와 문화유산 Vol.4 No.-

김환기는 1963년 제7회 브라질 상파울루 비엔날레에 첫 번째 한국인 대표로 참여하게 된다. 그는 산월과 고향의식 등의 스타일이 두루 집약된 모티브의 ‘달’ 그림을 중심으로 총 3점을 출품하였다. 상파울루 비엔날레 출품작은 동양의 자연관을 바탕으로 한국적 미의 세계를 지향하였다. 김환기는 1963년 제7회 상파울루 비엔날레의 예술문화 교류를 통해서 세계의 미술을 접하게 되었으며, 그 중에서 김환기가 진지하게 받아들인 것이 미국의 추상 표현주의 미술이었다. 그것은 세계미술전에서 대상을 받은 미국의 추상표현주의 화가 아돌프 고틀리브(Adolph Gottlieb)의 작품을 만나게 되었기 때문이다. 김환기는 고틀리브의 미술세계를 접함으로써 예술적 충격을 받으면서 인생의 전환점을 맞이하게 된다. 세계 미술전에서 한계를 인식하게 됨과 동시에 자신감도 얻게 되었다. 그는 곧장 뉴욕으로 가서 작품 활동 할 것을 결심하였으며 그것을 실행하게 된다. 김환기가 세계 비엔날레의 국제전 경험을 통해 자신의 한계를 인식하게 된 계기는 국제적으로 가치를 지니는 예술이란 지역적인 것의 강조가 아니라 지역과 세계의 만남을 통해 ‘공감’을 불러 일으켜야 한다는 것임을 깨달았기 때문이다. 또 국가의 정체성과 세계와의 소통이란 결국 자신의 뿌리에서 시작하되, 그것이 한정된 지역적인 소재로나 또는 이국적 화면으로 귀결되지 않기 위하여 ‘차이’와 동시에 ‘정체성’의 의미를 인식할 수 있는 새로운 시각이 드러나야 한다는 사실을 터득했다. 그리하여 그는 뉴욕에 정착하여 화면의 변화를 주도하였다. 상파울루 비엔날레에 참여한 이래 화면의 변화를 보인 대표적인 작품으로는 점화 <어디서 무엇이 되어 다시 만나랴〉가 있다. 이 작품은 한국일보 미술대상전에서 대상을 받음으로써 일반에게 공개되었으며, 작가의 새로운 표현방법에 대중들로부터 놀라움과 찬사를 받게 된다. <어디서 무엇이 되어 다시 만나랴>에서 작가 김환기는 기존의 작품경향과는 또 다른 새로운 자기세계를 완성하게 된 것이다. 김환기의 점화는 새로운 차원의 아름다움을 이끌어 내었다는 사실과 미적 이념이 ‘점’에 담겨 있다는 것에 그 특별함이 있다. 결과적으로 상파울루 비엔날레는 김환기의 예술세계에 있어서 가장 큰 전환점이 되었다. 그는 세계미술전에 참여하여 한국미술의 활동영역을 확장시키는데 기여하였을 뿐만이 아니라 국제적 동향을 미리 파악하여 한국 현대미술의 방향을 선도하였다. 이후 한국에서도 국제전에 대한 관심이 고조되었는데, 그러한 차원에서 볼 때 그는 우리 미술을 세계무대에 선보이며 그곳에서 다양한 미술교류를 증진시킨 선구적 역할을 한 셈이다. In 1963, Kim Whan Ki participated in the 7th Sao Paulo Biennial. He was the first Korean to participate in this event. He entered the exhibition with three moon paintings which integrated month of parturition and one’s consciousness of birthplace. These paintings which integrated East’s view of nature were aimed to express Korean artistry. Kim was able to encounter art of the world through cultural and artistic interchanges. He especially embraced America’s abstract expressionism after he saw Adolph Gottlieb’s artwork. Kim was immensely shocked by Gottlieb’s and other’s artworks and realized his limitation, but in the meanwhile earned confidence as well. He then immediately decided to go to New York to work on his paintings. Kim realized his artworks’ limitation during the Sao Paulo Biennial after realizing that artwork which possesses international value must arouse sympathy through combining different regions’ values rather than expressing one’s value. Also communicating one nation’s identity to the rest of the world requires to have a viewpoint which can embrace ‘Difference’ and ‘Identity’ rather than focusing on regional subjects and exotic appearance. Therefore, he focused to bring changes to his pictures. The most popular painting of Kim’s which represents pointillism is <Where and how shall we meet again>. This painting was presented to the public after winning the 1st place in the art contest which was held by Hankook Newspaper. When it was presented to the public, people were surprised by Kim’s unconventional way of expressing. <Where and how shall we meet again> allowed Kim to complete his new world of works which was differentiated from his old works. Kim’s pointillism is considered to be special because it created beauty in a new dimension and that ideology is embraced by dots. As a result, his participation in Sao Paulo Biennial in 1963 was the biggest turning point in his career. He not only contributed to expand Korean art’s boundary, but also found the direction of the international art and led Korean modern art to that direction as well. Considering the fact that his participation in Sao Paulo Biennial increased Korean art society’s attention in biennial, Kim opened the gate for Korean art to interact with rest of the world.

帥方蔚(수방울)과 서신 왕래한 김영작과 홍양후의 교류와 관심사 -『좌해교유록』을 통하여

김동석 ( Dong Suk Kim ) 우리한문학회 2012 漢文學報 Vol.27 No.-

Subangyul(帥方蔚) was a high-ranking government official in Qing Dynasty who made an interchange by letters with Joseon Dynasty literary man such as kim-yongzac(金英爵) and hong-yanghu(洪良厚) and so on from 1831 to 1834. This paper investigate into what they exchange during that time. At that time, most of literary man in the Joseon Dynasty were influenced by the Confucian culture. kim-yongzac(金英爵) gave a letter to Subangyul(帥方蔚), which he was opposed to the philosophy Wang Yangming. Subangyul(帥方蔚) explained the philosophy Wang Yangming and its history. And hong-yanghu(洪良厚) was looking for some Chinese persons who are the descendants of grandfather``s friend. Hong-yanghu(洪良厚)``s grandfather Hong-daeyong(洪大容) made some chinese friend in 1765 when he visited Beijing. Hong-yanghu(洪良厚) could connect with ban-gongsu(潘恭壽) who is the descendant of his grandfather``s friend ban-jungkun(潘庭筠) through Subangyul(帥方蔚) in China. But hong-yanghu(洪良厚) couldn``t keep touch with ban-gongsu(潘恭壽) because Subangyul(帥方蔚) did not want to deliver their letter. It made hong-yanghu(洪良厚) uncomfortable. At this time Kim-yongzac(金英爵) also feel uncomfortable to Subangyul(帥方蔚). As they familiar with each other, Kim-yongzac(金英爵) asked Subangyul(帥方蔚) a picture for his father``s long life. Subangyul(帥方蔚) criticized Kim-yongzac(金英爵)``s attitude. After they lost connection, kim-yongzac(金英爵) and hong-yanghu(洪良厚) did not want keep their letters. So there is any recording in kim and hong anthology. But Subangyul(帥方蔚) faithfully recorded their letters and published this letters in his anthology. Joseon Dynasty scholar kim-yongzac(金英爵) and hong-yanghu(洪良厚) are the descendants of bukhakpa(北學派) school which was built in middle of 18th century. In 19th century Joseon Dynasty officials are interacting with Qing dynasty officials more actively than 18th century. From 1831 to 1835 kim-yongzac(金英爵) and hong-yanghu(洪良厚) are not government officials. Even though subangyul(帥方蔚), could meet with kim-yongzac(金英爵) and hong-yanghu(洪良厚), he evaluate highly their enthusiastic response. And the book of《zahegyoyourok(左海交遊錄)》is the result of their friendship between two country in 19th century.

Slide Session : OS-IFD-07 ; Infectious Disease : In Vitro Antiviral Activity of Ribavirin Against Severe Fever with Thrombocytopenia Syndrome Virus

( Myung Jin Lee ),( Kye Hyung Kim ),( Jong Youn Yi ),( Su Jin Choi ),( Chung Jong Kim ),( Nak Hyun Kim ),( Kyoung Ho Song ),( Pyoeng Gyun Choi ),( Ji Hwan Bang ),( Wan Beom Park ),( Eu Suk Kim ),( San 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1

In Vitro Antiviral Activity of Ribavirin Against Severe Fever with Thrombocytopenia Syndrome Virus Myung Jin LEE1, Kye-Hyung KIM1, Jongyoun YI2, SuJin CHOI1, Chung-Jong KIM1, Nak- Hyun KIM1, Kyoung-Ho SONG1, Pyoeng Gyun CHOI1, Ji-Hwan BANG1, Wan Beom PARK1, Eu Suk KIM1, Sang-Won PARK1, Hong Bin KIM1, Nam Joong KIM1, Myoung- Don OH1 Seoul National University College of Medicine, Korea1, Pusan National University School of Medicine, Korea2 Background: Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease caused by a novel Bunyavirus, severe fever with thrombocytopenia syndrome virus (SFTSV). No effective antiviral therapy is proven yet, but clinical use of ribavirin (RBV) has been tried. We investigated the antiviral effect of RBV against SFTSV in vitro. Methods: To test for cytotoxicity of RBV, Vero cells were treated with different concentrations of RBV (3.90 to 500 μg/mL, two-fold dilution) and analyzed by cell viability MTS assay 48h post-infection. To determine antiviral activity of RBV against SFTSV, Vero cells were infected with SFTSV strain Gangwon/Korea/2012 at 100 TCID50 (50% tissue culture infective dose) per well in a 96-well plate, and RBV was added at the concentrations showing no or minimal cytotoxicity. Viral RNAs were extracted from the culture supernatants and quantifi ed using one-step real-time reverse transcription- PCR to amplify the partial large segment of SFTSV. Statistical analysis was done by one-way ANOVA with Tukey`s post hoc test. Results: Cytotoxicity due to RBV was not observed at RBV concentration =31.3 μg/ mL. Viral RNAs at 24h post-RBV treatment were reduced with increasing RBV concentrations (1-32 μg/mL), compared with those of mock-treated cells (P <0.01, Figure). Half maximal inhibitory concentration (IC50) of RBV was 3.69 μg/mL at 24h post-RBV treatment. Conclusions: Our study shows that RBV has antiviral effect against SFTSV in a dose-dependent manner. Further studies are required to evaluate the effi cacy of RBV in SFTS.

한국적 생명사상에 대한 비평적 고찰: 김지하의 생명사상을 중심으로

김석호 ( Suk Ho Kim ) 한국복음주의신학회 2014 성경과신학 Vol.69 No.-

This article tried to articulate the understanding of life in the korean context as analyzing Jiha Kim`s life thought which is one of main influences to life thought or life theology of Korea. His life thought was produced as uniting various philosophical ideas such as Jiki, Hanulnim, and Bulyeongiyeon. Jiki, etc. Life means the internal principle or power and the external formation, and it points out that the visible and invisible world are one. Life as Hanulnim is divine, and humanity and other things having life are one, holy and equal. Life as Bulyeongiyeon means dynamism which leads change and development. The concept of life including all these elements implies a total unity of all things in a holistic and conductional (action) perspective. The relationship between ultimate reality (God), humanity, and nature is inseparable within the change or movement of life. These three realities of God, humanity, and nature are one in ``life``. In the sense of human ethical responsibility, Kim insists that our action must be based on the recognition of our total union of ultimate reality (God), humanity, and nature and when we act accordingly, we serve or possess (Mosim) this original nature of life. Chiha Kim sees all existences in the holistic view of life as one, and recognizes them the holistic and cosmic life on the basis of dynamic relationality. The universe, humanity, nature and the cosmic life possess a universal identity. Everything is originally one, though everything has its own uniqueness, diversity, and complexity. His life thought includes the concept of locality, which considers the local contexts and reality as the subjects and objects and indicates ``here``, ``now``, ``tradition``, and ``the reality`` as the foundation of solving problems. In the Korean multi-religious contexts, therefore, traditional religious themes, practice, and spiritual experience are at the heart of the understanding of ecological theology. He has shown a Korean way of ecological thought that opposes the destructive tendencies of division, confrontation, competition, materialistic capitalism, industrial civilization, individualistic anthropocentrism, technological development, mechanistic worldview, etc., which mostly came from outside Korea. Nevertheless, his life thought inevitably contains pantheistic or panentheistic view of the reality which is not acceptable in Christianity. It may be caused by the understanding of the ultimate relality as non-personality which is power or principle to be able to exist or sustain life. The understanding of life in Christianity is derived from Triune God who has communicable to his creation in His personality. Therefore, it shows that korean christian should be aware of this tendency of the understanding of life.

石坡 李昰應 墨蘭畵風의 형성

金貞淑(Kim Ch?ng-suk) 한국미술사학회 2002 美術史學硏究 Vol.- No.233·234

Yi Ha-?ng, sobriquet S?kp' a, was the father of King Kojong(r. 1867-1907), the 26th ruler of the Chosen dynasty, and was titled the H?ngs?n Taew?n' gun 興宣大院君 generally called Taew?n' gun. Yi was a radical politician who attempted to reform the national system with the “Chosen style" manner when he reigned during the turmoil: in law's of the royal family of the Andong Kim clan of the late Chos?n period held sway and the Western empires aimed at conquering Korea. Nevertheless, he sought his own direction for the government developments. On the other side, he was an artist developing his individual orchid paintings based on Kim Ch?ng-h?i' s 金正喜 painting style. He went back and forth between the dominance of the authority and relinquishment of power. Because of his political aspiration, however, he greatly concentrated on creating substantial and lofty orchid paintings as means to express his complicated emotion whenever he was in hard times. As a result, he achieved the dignified literati painting accompanying with poems and calligraphy (shis?hwa ilch'i, 詩書畵一致) as well as his individual manner in depicting ink orchids. The most distinguished feature in Yi Ha-?ng' s artistic ambience is that he persisted to paint monochrome orchids throughout his whole life. It is assumed that this came from his admiration toward orchids for their refined beauty and elegant fragrance. Moreover, he is supposed to have strenuously disciplined his mentality by portraying orchids because it has served as the embodiment of gentlemens' virtue in literati tradition. As much as being called "S?kparan 石坡蘭." his well-known orchid paintings established one of the modes of 'Korean indigenous ink orchid paintings" , distinguished from Chinese ones by accomplishing his representative painting style in its composition and brushwork, One of the characteristics in formative stages of ink orchid paintings by Yi is that he pursued individual painting styles by studying an eminent literati calligrapher and painter, Kim Chong-hui' s idioms and by adopting fashionable elements from Chinese ink orchid paintings. Since his early thirties. he studied calligraphy and orchid paintings under Kim. and was praised by his teacher. Kim emphasized on samj?n-p?b 三轉法, a technique to twist the tip of the brush three times in portraying leaves of orchids, that Yi practiced over again, After the death of Kim. he succeeded his teacher and accepted new composition and depiction in manuals of ink orchid paintings of Ming and Ch'ing China. In particular, when he was expelled from the throne and was dwelling at Chikgok sanbang (直谷山房, Studio of Chikgok). he created three types of ink orchid paintings: the grouping of uprooted orchids with long leaves 群蘭畵. the coupling of orchids and rocks 石蘭畵 with the setting, and the densely grouping of orchids 叢蘭畵. generally mounted as a hanging scroll. nus asserts that such individual modes of his were formed on the basis of Kim Ch?ng-h?i' s ink brush method, and later became the typical type of 50kp 'aran, Among his above mentioned individual modes, the painting of coupling orchid and rocks had developed to the main and constant theme until his late years. Even after Yi Ha-?ng, a number of orchid painters copied his S?kparan style and his great influence has survived untill today.

유압벌지실험을 이용한 순 티탄늄 판재의 소성유동곡선 평가(제2보)

김영석(Kim, Young-Suk),김진재(Kim, Jin-Jae) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.4

본논문에서는대형 선박의 판형열교환기등에 널리 이용되고있는 순 티타늄판재의소성변형을 유한요소해석하기 위한 기초 데이터로서 순 티타늄 판재의 유동곡선을 평가하였다. 순 티타늄 판재의 프레스 가공 시에 판재에는 국부적으로 큰 소성변형이 발생하고 있다. 그러나 기존의 단축 인장실험에서 얻을 수 있는 소성변형률이 낮아서 티타늄 판재의 가공공정 설계를 위한 유한요소해석의 정밀도를 떨어뜨리는 경우가 있다. 본 연구에서는 큰 소성변형률 까지 안정적으로 성형이 가능한 유압벌지실험을 수행하여 재료의 소성변형에서 가공경화특성을 나타내는 유동곡선으로써 진응력-진변형률 선도를 구하였고 그 결과를 인장실험 결과와 비교하였다. 순 티타늄 판재의 유압벌지실험에서 재료의 변형률은 3D 디지털 영상 상관법을 이용한 ARAMIS 시스템으로 실시간 측정된다. 이 유압벌지실험으로부터는 소성 변형률이 0.65 이상 까지도 안정적으로 재료의 소성유동곡선을 얻을 수 있었으며 그 결과는 Kim-Tuan 이 문헌 17[Y.S. Kim, J.H. In, Korean Acadmia-Ind. Coop. Soc.,(be in print), 2016] 의 연구에서 제안한 가공경화식으로 잘 핏팅됨을 알 수 있었다. In this study, the plastic flow curve of commercially pure titanium sheet (CP Ti) actively used in the plate heat exchanger etc., was evaluated. The plastic flow curve known as hardening curve is a key factor needed in conducting finite element analyses (FEA) for the forming process of a sheet material. A hydraulic bulge test was performed on the CP Ti sheet and the strain in this test was measured using the DIC method and ARAMIS system. The measured true stress-true strain curve from the hydraulic bulge test (HBT) was compared with that from the tensile test. The measured true stress-true strain curve from the hydraulic bulge test showed stable plastic flow curve over the strain range of 0.7 which cannot be obtained in the case of the uniaxial tensile test. The measured true stress-true strain curve from the hydraulic bulge test can be fitted well by the hardening equation known as the Kim-Tuan model.

Immobilization with Ketamine HCI and Tiletamine-Zolazepam in Cynomolgus Monkeys

Myung-cheol Kim,Sung-hyeok Hong,Soo-jin Lee,Young-suk Kim,Jae-il Lee 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

with Ketamine HCl and Tiletamine-Zolazepam in Cynomolgus MonkeysJae-il Lee, Sung-hyeok Hong, Soo-jin Lee, Young-suk Kim and Myung-cheol Kim*Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, KoreaReceived March 4, 2003 / Accepted July 2, 2003J. Vet. Sci. (2003), 4(2), 187-191JOURNAL OFVeterinaryScience*Corresponding author: Myung-cheol Kim Laboratory of Veterinary Surgery, College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Korea Tel: +82-42-821-6757, Fax: +82-42-822-4216 E-mail: mckim@cnu.ac.kr