원발성 두개강내종양 2,616례의 통계학적 연구(1976-1995)

황승균,정희원,오창완,양희진,남도현,이상형,정영섭,김동규,왕규창,한대희,최길수,조병규 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.7

[논문]ZCS를 이용한 간단한 long pulse CO2 레이저 전원

김태균,이임근,김희제 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-

30Torr 이하 저압 공진기에서 ms order의 long pulse duration을 가진 간단한 펄스 CO2 레이저를 구현하였다. 레이저 시스템의 새로운 전원은 직접 상용전원을 스위칭한다. 이 새로운 전원의 방전 회로에는 정류기, 축전용 커패시터, 또는 전류 제한용 저항이 필요하지 않다. 레이저 출력을 제어하기 위해 펄스 반복률을 최대 60Hz까지 조절했고,SCR의 스위칭각은 30°에서 150°까지 변화시켰다. ZCS circuit과 PIC one-chip microprocessor는 SCR 게이트 신호를 제어하기 위해서 사용되었다. 18 Torr 압력,60Hz 의 펄스 반복률,SCR 스위칭각 90°에서 최대 레이저 출력 35 W를 얻었다. 또한 다른 CO2 레이저와 비교해서 long 펄스를 얻을 수 있었고 이는 대략 3ms(FWHM) 였다.

쥐의 피아조직에서 Nitionl과 Stainless steel의 삽입으로 인한 조직반응에 대한 비교 연구

나춘균,강상균,박희주,김의한 순천향대학교 1994 논문집 Vol.17 No.2

An experimental study was carried out to compare the tissue reaction of nitinol with that of stainless steel. 0.5cm, 27 nitinol wires(A group) and 0.5cm, 27 stainless steel wires(B group) were inserted into the beneath back skin of each 54 white rat and examined for 8 weeks. 3, 5, 7, 10 days, and 2, 3, 4, 6, and 8 weeks after the insertion, 6 rats(3 nitinolinserted rats and 3 stainless steel-inserted rats) were sacrificed and examined to make emphasis on such microscopic points as 1) vascular proliferation 2) type of infiltrated inflammatory cells, 3) proliferation of fibroblasts and collagen 4) the thickness of the membrane surrounding implants and 5) epidermal growth factor reactivity. As a result, the vascular proliferation and fibroblastic and collagen proliferation appeared to be somewhat earlier in the A group than in B group and the thickness of membrane was slight thicker in A group than in B group at an early stage. However, the infiltrated inflammatory cells showed no difference between both A and B groups. The above findings suggested that formation of the granultion tissue appeared somewhat earlier in the A group, but there were no significant meanings on microscopic grounds between them. Insertion in both A and B groups reflected the most intense reactivity of EFG after 3-5 days. The results that the reactivity of EGF was more intense at the periphery of the membrane after 2-3 weeks in bath A and B group were given in that the production of fibroblasts and collagen were revealed chiefly at the periphery of the membrane adjacent to nitinol and stainless steel.

Romey의 方法에 따른 高等學校 地球科學 敎科書의 分析

禹榮均,李義雨,金熙洙 공주대학교 사범대학 과학교육연구소 1993 과학교육연구 Vol.24 No.1

Science Ⅰ(2) and Earth Science, the high school textbooks by the 5th curriculu, were analyzed by Romey`s method and analytic results were compard. The results of Science Ⅰ(2) textbooks are as follows: In the contents, the index of students involvement ranges from 0.16 to 0.02. The average indices in each chapter of 8 different textbooks are 0.08, 0.10, 0.09, 0.08 and 0.05. The maximum index is in chapter Ⅱ and the maximum index chapter Ⅴ. In the figures and tables, the index of students involvement ranges from 1.00 to 0.00. The average indices in each chapter of 8 different textbooks are 0.29, 0.25, 0.21, 0.25 and 0.14. The maximum index is in chapter Ⅰ and the minimum index in chapterⅤ. In the exrecises, the index of student involvement ranges from 1.50 to 0.00. The average indices in each chapter of 8 different textbooks are 0.45, 0.23, 0.33, 0.25 and 0.31. The maximum index is in chapter Ⅰ and the minimum index in chapterⅡ. The results of Earth Science textbooks are as follows: In the contents, the index of student involvement ranges from 0.15 to 0.00. The average indices in each chapter of 7 different textbooks are 0.07, 0.06, 0.04 and 0.04. The maximum index is in chapter Ⅰ and the minimum index in chapter Ⅲ and Ⅵ. In the figures and tables, the index of student involvement ranges from 0.67 to 0.00. The average in each chapter of 7 different textbooks are 0.17, 0.21, 0.15 and 0.04. The maximum index is in chapter Ⅱ and the minimum index in chapter Ⅵ. In the exercises, the index of student ranges from 1.00 to 0.00. The average indices in each chapter of 7 different textbooks are 0.23, 0.32, 0.40 and 0.35. The maximum index is in chapter Ⅲ and the minimum index in chapter Ⅰ. The suitable involvement index for inquiry learning should be over 0.40(Romey, 1968), but the indices shown above are below 0.40. Therefore, as a whole, it is considered that Science Ⅰ(2) and Earth Science textbooks by the 5th curriculum are not suitable for inquiry learning. But, partly, ordering contents, figures and tables, and exercises index of student involvement is seen the progressive tendency to 0.40. Therefore, figures and tables than contents, and exercises than figures and tables, and Science Ⅰ(2) than Earth Science are more inquiring. And, according to the textbooks, or chapters, or contents, figures and tables, exercises, index of student involvement are partly higher than 0.40. There would be the possibility of raising the index value of the textbooks if the writer would pay more times, attentions and endeavors in editing new textbooks.

통계적 방법을 이용한 MR 영상의 조직 분류

임희자,송주환,오병균 木浦大學校基礎科學硏究所 1998 基礎科學硏究誌 Vol.16 No.-

We describe a segmentation of head MR images using the statistical method. This comprises five stages, such as user interactive identification of tissue classes, calculation of a probability distribution for each tissues, segmentation of MR images using the probability distribution, interpolation of the segmented MR Images, and Rendering. We segment a head MR image into four sorts of tissues, such as air, face, brain, and CSF. MRI can generate three types of MR images, such as PD(proton density), T1(spin-lattice relaxation time), and T2(spin-spin relaxation time). We calculate mean, variance, correlation from sample point of two images among the three types of images, - in results, because PD and T2 correlation is the largest one of them, we use PD and T2 MR images -and we acquire the bivariate normal probability distribution for each tissues using those. MR images are segmented using the bivariate normal probability distribution into each tissues.

탈냉전 시대 유엔의 강제적 인권레짐의 형성배경과 실태

정희석,김도균 慶北大學敎 社會科學大學 2005 社會科學 Vol.17 No.-

본 논문에서는 잭 도넬리의 인권레짐 분석을 기초로 탈냉전 시대 유엔의 강제적 인권레짐의 형성배경과 실태에 대해 연구하였다. 잭 도넬리는 『국제인권 : 레짐분석』이라는 논문에서 국제인권레짐을 선언적 레짐, 장려적 레짐, 실행적 레짐, 그리고 강제적 레짐으로 분류하여 서술하고 있다. 그러나 그는 유엔에 의한 강제적인 인권레짐의 형성은 불가능한 것으로 보고 있으며 강제적 인권레짐이 형성되기 위해 「국제적인 의사결정」과 「국제적인 감시체제」가 형성되어야함을 설명하고 있다. 이러한 분석의 기준에 덧붙여 본 논문에서는 「국가주권에 대한 제한」 및 「국제법의 주체로 인식된 개인」을 강제적 인권레짐이 형성될 수 있는 기준으로 설정하고 그 시대적인 요인을 네 가지로 분석했다. 첫째, 구 소련과 구 동구권 공산국가들, 그리고 제 3세계 국가들의 민주화의 실패로 야기된 대규모 인권침해사태, 둘째, 세계화의 확대에 따른 정치적, 경제적, 사회적 측면에서의 인권침해 현상, 셋째, 저강도 분쟁으로 불리는 새로운 국제분쟁의 유형과 국내분쟁의 급증으로 인한 집단학살이나 대규모 살육과 같은 인권침해사태의 증가, 마지막으로, 인간안보를 중심으로 새롭게 대두된 신안보개념의 등장 등이 유엔에 의한 강제적 인권레짐의 가능성을 담보해낼 시대적인 요인이라고 보았다. 이러한 현실적인 유엔의 강제적 인권레짐 실태로는 심각한 인권침해를 저지르는 국가에 대한 유엔안보리의 인도주의적인 군사적 · 경제적 제재조치, 인도주의적인 관점에서 탈냉전 시대 변화해 가는 유엔의 평화유지활동, 전 세계적인 감시체제를 가동하면서 유엔의 인권정책을 통합한 유엔 인권고등판문관 활동, 그리고 심각한 인권침해를 저지른 각 국의 개인범죄자들을 처벌할 수 있는 국제형사재판소 활동 등을 들 수 있다. The purpose of this study is to analyze on the background and the realities of the United Nations' enforcement regime for human rights in post-cold war era. In 1986, Jack Donnelly presented the most prominent paper in the international human rights field called "International Human Right : A Regime Analysis." In the paper, he regarded international human rights activities as human rights regime and arranged the international human rights regime into four categories, declaratory regime, promotional regime, implementation regime, and enforcement regime. There are two major problems in his international human rights regime analysis. First of all, he insists that enforcement regime would be hard to be realized in the international society because of nation states sovereignty. Secondly. he ignores the important role of human rights Non-Government Organizations at the level of international politics. Because of the date of his thesis, he couldn't focus on human rights regime in the post-cold war era. This thesis gives the major reasons for the United Nations' enforcement regime for human rights. Why is United Nations' enforcement regime for human rights necessary in the world? First, the side-effect of democratization is more serious human rights violations in former Soviet Union and the Third World. Second, globalization has had a negative effect on human rights on the political, economic, and social level. Third, low-intensity conflict throughout the world has caused more death and injury than it did during the cold war and civil was has also broken out more frequently than interstate conflict since cold war. This means the United Nations peace-keeping operations have suddenly had to increase due to the increase of low-intensity conflict or civil war. Finally, a new security concept has replaced the traditional security concept. It mainly focuses on human security including social, economic, environmental security. This thesis mainly presents four major categories of the United Nations' human rights enforcement regime. These are the United Nations Security Council, the United Nations Peace-keeping Operations, the United Nations High Commissioner for Human Rights, and the United Nations International Criminal Courts.

연삭기용 직각 전자척의 자력특성에 관한 연구

이우균,이용구,맹희영 서울산업대학교 산업대학원 2000 大學院論文集 Vol.7 No.-

The new efficient square electro-magnetic chuck, which is using for the clamping devices of grinding machine, is developed in this study to improve the convenience of grinding work and to give the workpiece high parallelism and flatness without scratch or deformation. The recommended structure of magnetic cells are updated to find the most superior magnetic characteristics by using the finite element analysis and sample prototyping, The analyzed results are retrofitted to solve the drawbacks of previous models step by step by considering the characteristics such as magnetic fields, strength, distribution, and thermal deformations of magnetic chuck. Finally the most recommended models is designed to satisfy the KS specifications with commercial magnetic chuck, and the prototype chuck with this dimensions and structures is manufactured, it is also analyzed the overall characteristics of magnetic chuck and is performed the experimental investigations whether the KS specifications are satisfied.

기상 에탄올 측정을 위한 후막형 전기화학식 바이오센서

이희진,박제균,김성태 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1

An amperometric biosensor has several advantages such as, among others, low production cost, simple measurement scheme over other types of biosensor. Up until now, research activities in amperometric biosensors have mainly been focused on the liquid-phase analysis. However, efforts are required to be directed towards newly developing the capability of analyzing gas-phase samples for wide and extensive applications of amperometric biosensors. In this work, we have successfully fabricated a thick-film amperometric biosensor with the capability of effectively and sensitively sensing ethanol vapor, demonstrating that even gas-phase sample can be effectively detected using a simple amperometric biosensor.

Human tissue-type plasminogen activator의 국소 세척 및 전신 투여가 미세혈관 혈전증에 미치는 영향

류승희,오희균 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.3

The needs of microvascular anastomosis or vessel graft to reconstruct maxillofacial tissue defect has been increased and a variety of attempts to improve the rate of patency has been achieved. Thrombolytic agents has been advocated in order to decrease the failure rate of microvascular anastomosis and to prevent the need for reoperation. Older thrombolytic agents, such as streptokinase or urokinase, have a significant side effects such as allergy, hyperthermia, systemic bleeding complications. This study was performed to evaluate the effect of local irrigation and intravenous administration of human tissue-type plasminogen activator (t-PA), which is known as effective thrombolytic agent with less systemic side effects, on patency and thrombus formation of experimental microvascular anastomoses in the traumatized femoral vein of rabbit. Nine rabbits weighing about 2㎏ were used. After exposure of both femoral veins. the veins were crushed by the jaws of smooth needle holder in order to create a thrombosis model. Transectional incision was made in the vein. The animals were then divided into 3 groups: 1) Experimental Group Ⅰ, topical irrigation of lumen with t-PA saline solution (n=6); 2) Experimental Group 2, Intravenous administration of t-PA (0.75 ㎎/㎏) via the marginal ear vein for 3 days; 3) Control Group, topical irrigation of lumen with saline solution (n=6). The veins were anastomosed utilizing microvascular technique with 10-0 Ethilon. The patency was evaluated with empty-and-refill test 30 minutes and 3 days after microanastomosis. The thrombus formation was evaluated 3 days after microanastomosis by observing the thrombus with surgical microscope. The histologic findings were also evaluated. The results were as follows: 1. Thirty minutes after microvascular anastomosis, the patency of all Experimental Groups 1 and 2 was more improved than that of Control Group. However, there was no significant difference among groups. 2. Three days after microvascular anastomosis, the patency of all Experimental Groups was much more improved than that of Control Group (p<0.05). There was no significant difference between Experiment Group 1 and Experiment Group 2. 3. Three days after microvascular anastomosis, the amount of thrombus in all Experimental Groups was much less than that of Control Group (p<0.05). 4. In histologic findings, a lot of luminal thrombus were observed around sutured area in Control Group. Few luminal thrombus was observed in all Experimental Groups. The necrotic changes were was observed in the vessel wall of all specimens. These results indicate that topical irrigation and intravenous administration of t-PA are effective measures in improving patency and preventing thrombus formation after microvascular anastomosis.

線型回歸分析에서의 殘差에 對한 小考

崔熙均 聖心女子大學校 1991 論文集 Vol.23 No.-

선형회기분석에서 잔차를 검토하는 것은 무척 중요한 일이다. 본 연구에서는 통상적인 잔차(ordinary residual)의 단점을 보환하려는 노력의 결과로 얻어지는 여러가지 잔차중에서 상수분산을 갖는 선형불편잔차(Linear unbiased residual with scalar variance, LUS)에 관하여 알아 보았다. 즉, 직교화 과정(orthogonalization procedure)에 의한 LUS중 특히 Householder의 직교 변환행열(orthogonal transformation matrix)에 의한 L.U.S.H와 Givens의 직교변환행열에 의한 recursive residual의 유도와 그들의 성질을 알아보고 또 비교도 하였다.