[논문]Operational Characteristics of CO2 Laser Adopted by Superposing-Discharge

Hee-Je Kim,Hyun-Ju Chung,Byoung-Dae Min,Jong-Han Joung,Sung- lun Park 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

오늘날 현저한 CO2 레이저의 응용 추세에 발맞추어 보다 다양한 형태의 출력 제어 기술이 대두되고 있다. 본연구에서는multi-Pulse Superposing-Discharge 기술을 이용하여 다양한형태의 CO2 레이저의 펄스를 성형 하였다. 펄스 성형을 위한 방법으로 PIC one-chip microprocessor를 이용하여 삼중 PFN 모률의 SCR을 각각 고유의 지연시간을 가지도록 제어하였다. 실험에 사용된 삼중 PFN 모률의 전원 회로는 각각 캐패시터 인덕터,SCR,고압 펄스 트랜스 그리고 고압 트랜스 2차측에 브릿지 정류기로 구성 하였다. 고압 펼스 트랜스의 1차측을 제어하므로서 PFN 모률의 동작을 저 전압에서 수행 할 수 있다. 트랜스의 2차측에 연결된 전파 정류기는 펄스 에너지를 부하에 지속적으로 전달한다. 본 연구에서는 삼중 PFN 모률의 각각의 SCR을 다른 시간 가격을 두고 트리거 하므로서 다양한 Long pulse shaping을 실현하였다. 또한 약 250-1000μs 의 주기를 가지는 다양한 펄스형 레이저 빔을 얻었다.

폐농양 및 복부농양을 일으킨 Eikenella corrodens 감염 2예 : Two Case Reports and Review

정용희,류미숙,김영식,이우인,이희주,서환조 대한화학요법학회 2000 대한화학요법학회지 Vol.18 No.1

Eikenella corrodens is a slowly growing, facultative anaerobic gram-negative bacillus. It is a normal inhabitant of the human upper respiratory tract, and it is recognized as an infrequent cause of invasive disease. To date, a few cases of E. corrodens infection were noted from all other organ. We report herein two cases of E. corrodens infection. In one case E. corrodens was isolated in the lung abscess and in the other case it was in the appendiceal abscess. The patients were treated empirically with penicillin G. The results of the bacterial culture and sensitivity test were available with it. The patients were discharged 15 days later with marked improvement after treatment. Our report clearly demonstrates that E. corrodens can be the pathogen of lung abscess and intraabdominal abscess. We reviewed descriptions from the literature of infections caused by E. corrodens.

물품음란애(Fetishism)를 동반한 Tourette syndrome 1례 보고

정희연,임두원 순천향대학교 1992 논문집 Vol.15 No.2

We report a rare case of Tourette syndrome associated with fetishism. In our opinion, there is a need for further evaluation about the association between this syndrome and hypersexuality of his father, and there is also another need for evaluation about the pathophysiologic mechanisms involved other than dopamine.

경동맥 내막 절제술 후 발생한 과관류 증후군 1예

송희정,박광열,정진상,조수진,이순정,허승,김동익,이광호,이병붕 대한신경과학회 1999 대한신경과학회지 Vol.17 No.2

모델 리파지토리를 이용한 기업지식경영 : P사 적용 사례를 중심으로 P Company Case

정재우,이희석 한국경영과학회 1999 經營 科學 Vol.16 No.2

The management of enterprise knowledge has been increasingly important because knowledge emerges as the new basis of competition in postcapitalist society One of the key issues in knowledge management is to put knowledge into a repository where it can be easily stored, reused, and recreated This paper proposes a model repository and the corresponding knowledge management framework The emphasis of model repository is on abstracting knowledge in the form of schematic models Two major benefits are model independence and model integration A metascherma is constructed according to six conceptual components separate unit, external link, internal link, separate unite descriptor, link descriptor, and composite descriptor, which can be applied for a variety of models A prototype system with a case illustrates the practical usefulness of model repository for knowledge management

자료표현 학습에서 자기조절 학습시스템이 학업성취도에 미치는 영향

윤정희,이은경,한건우,이영준 韓國敎員大學校 敎育硏究院 2007 敎員敎育 Vol.23 No.2

In order to understanding the principles of computer operation, students need to know data representations first. But most of students have difficulties in understanding it and their academic achievements are relatively low. Therefore, we developed a self-regulated learning system based on self-regulated learning strategies and implemented it in the high school. The experimental group was taught with the self-regulated learning system, while the control group was taught with a traditional teaching method. We found that teaching with the self-regulated learning system has more positive effects on academic achievement than teaching with a traditional method in data representation learning. 인문계 고등학교 ‘정보사회와 컴퓨터’ 과목의 ‘자료표현’ 영역은 컴퓨터의 작동원리를 이해할 수 있는 중요한 영역이지만 학생들은 이 영역 학습을 매우 어려워하며 성취도도 낮은 편이다. 따라서 학생들이 보다 쉽게 ‘자료표현’ 영역을 학습할 수 있는 지원시스템이 필요하며 본 연구에서는 개인의 능력에 따라 학습이 가능하고 실질적인 교수학습과정에 유용하도록 설계된 자가조절학습 프로그램을 적용한 자기조절학습시스템을 개발하였다. 개발된 시스템을 실제 교수 학습 현장에 적용하여 자기조절학습시스템을 활용한 수업이 학습자의 학업성취도에 긍정적인 영향을 끼쳤음을 확인하였다.

핵산의 절단을 유발하는 전이금속착화합물의 합성

김희정,이범규,고문주 조선대학교 환경연구소 2000 環境硏究 Vol.16 No.1

Study on the synthesis of chemical nucleases that have ability of cleavage of RNA or DNA to investigate the structure of nucleic acids was performed. We synthesized Ni-complex that was synthesized by Karn and Busch (1966) and identified the specificity and ability as chemical nuclease by Chen et. al. (1993), and Cu-complex and Cd-complex that were presumed as having specificity similar to Ni-complex in terms of the structure and specificity and ability as chemical nuclease. The spectra of synthesized new transition metal complexes were compared with those of Ni-complex. Results of comparing data of UV and IR spectra of Cu-complex and Cd-complex with those of Ni-complex showed that the structures of newly synthesized transition metal complexes were similar to the structure of Ni-complex. The yield of synthesis of Ni-complex, Cu-complex, and Cd-complex was 81%, 7%, and 39% respectively.

Efficacy of Intracytoplasmic Sperm Injection for Leukocytospermia

강희규,--,--,--,--,--,--,--,-- THE KOREAN SOCIETY FOR BIOMEDICAL LABORATORY SCIEN 2004 Journal of biomedical laboratory sciences Vol.10 No.1

White blood cells (WBCs) are present in most human ejaculates, but abnormally high concentration of seminal leukocytes map reflect an underlying pathological condition. The World Health Organization (WHO) has defined leukocytospermia as status of more than 10^(6) WBC/mL of semen. The purpose of this study was firstly, to compare the outcomes between conventional IVF and ICSl in leukocytospermia, and secondly, to investigate whether ICSI may be an alternation treatment for patients with leukocytospermia. Total 346 cycles of conventional IVF and ICSI candidates underwent IVF cycles at Eulji Hospital Infertility Clinic. Semen Parameters including concentration, motility, morphology of spermatozoa and concentration of leukocytes were assessed from the raw ejaculates. There was no difference in sperm concentration, motility and morphology. The rates of fertilization and good embryo development from ICSI were significantly higher than those from conventional IVF in leukocytospermia (60.4% & 32.5% respectively for ICSI group and 44.4% & 28.5%, respectively for IVF group, P<0.001). The pregnancy rate after ICSI was also higher than that from conventional IVF (34.0% vs 29.1%. P<0.05). These results indicate that the presence of seminal leukocyes (>1×10^(6) WBC/mL of semen) is adversely related with fertilization, embryo development and pregnancy rate. Therfore the measurement of seminal leukocytes in routine semen analysis appears to be of prognostic value with regard to male fertilizing potential. In conclusion. it is suggested that ICSI is an alternative choice of treatment for patients with leukocytospermia.

Ballet에 나타난 Character Dance에 관한 연구

송정희 경희대학교 체육과학연구소 1997 體育學論文集 Vol.25 No.-

Dance is the most human artistic term that develops very closely with the stream of history which if continuously changing. Dance, which takes a form of the most honest self-expression toward actual world, has been strongly survived through many difficulties and confusions of society and human circumstances as a reflection of the times. Particularly, folnk dance has been been transmitted today to prevail all over the world, and takes very important role in leading the cultural interchange for understanding every nation's peculiar characteristics and customs. It is because of that folk dance has developed while preserving a nation's unique culture and traditions in spite of her numerous social changes, and that also has largely contributed to the formation of culture and society through various traditional contents and forms of dance. And we can find the foundation of movement expression of folk dance existant in the form of ballet, and as the result it have given a considerable affect on movements and subject matters of ballet. In this thesis, I studied how character dance was utilized in the Ballet Daction on the basis of the above. Character Dance is considered to be utilized in the following three aspects; communicating expression, divertissment, creation. As the above, the dence study on folk dance brought not only diversity of movements as an expression style but also enlargement of subject matters, so that it would be a original source for choreographers who would intend to create dance. In reality, Historic Dance as well as Character Dance is studied deeply in foreign ballet schools. Therefore in Korea Character Dance should be introduced into curriculum in univcrsities and professional ballet corps. In order to develop ballet in Korea, I considered, we should have interest in Korean folk dance and the folk expressions should be developed and applied. Through this it is possible to settle the peculiar culture of national ballet. And then it is a good guiding principle to grope a desirous direction of ballet in the future, too.

FMS導人의 妥當性 評價 要因 分析에 관한 硏究

河正鎭,金成熙 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-

FMS(Flexible Manufacturing Systems) is recognized as a useful approach to meet with multi-product and small-lot-sized production system. Thus, the large-scaled investment is necessary for introducting FMS. It is apparent that traditional capital budgeting methods are not adequate for the justification of FMS. In order to justify FMS, it is required to evaluate all the relevant, economic criteria of introducing FMS, where some of the factors are difficult to quantify. In this paper, two hierarchical factors are proposed : the one is a preliminary factors to study the strategic effect of introducting FMS, the other is a tactical factors to evaluate the economics of alternatives of FMS.