[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.

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.

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.

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

한국 텔레비전 방송과 어린이에 대한 연구 : 특히 TV매체의 cultivation effects를 중심으로

윤희중 이화여자대학교 한국문화연구원 1988 韓國文化硏究院 論叢 Vol.53 No.-

Korea, along with its extraordinary economical growth, has seen a matching growth in the media industry and media consumption. The expeditious development of mass media, a characteristic of industrialization, disseminates a standardized, typified, homogenized culture through the mechanisms of mass communication. Television, because of its wide diffusion, plays a central role in the creation, dissemination and maintenance of the culture of a particular society. Public and commercial television broadcasting systems presently coexist in Korea. This combined structure was initially aimed at the realization of the public interest and the cultivation of a healthier popular culture. But because of the capitalistic properties of the television media, television is presently more inclined to the degradation of popular culture rather than its upgradation. This research interests itself with the influence of popular culture on the thought processes and living patterns of its consumers, (3rd and 6th grade children). It concerns itself specifically with what is being transmitted by television and how this is being received and processed by the audience of 3rd and 6th grade children. A combined method of content analysis of TV programs and audience survey was used for this study. An audience survey was carried out to compensate the impracticality of earlier studies which only analyzed the contents of TV programs and deduced the effects unilaterally and theoretically. The survey essayed to discover how the contents of television was actually accommodated and evaluated by the audience. Content analysis of TV programs were carried out for a period of one week from Feb. 2(Mon.), 1987 to Feb. 8(Sun.), 1987. Two or three broadcasts were selected on an alternative day basis for daily programs (in the case of a fifteen minute program), one broadcast for weekly or semiweekly programs and three broadcasts per station on an alternative day basis for daily news programs were selected for analysis. Quantitative analytical methods were mainly used but content properties which could not be quantified were examined through qualitative methods. The criteria and unit of analysis was varied for different programs in accordance with each program's peculiarity. The audience survey was carried out in the Seoul area through a pre-structured questionnaire. The results and problems raised through content analysis show that although TV does not affect children's consciousness and behavior pattern absolutely, however analysis pointed out following problems in programs for children in Korea TV broadcasting. 1) Violence becomes main means of solving problem in cartoon and it created a sense of value to children that violence is more easy and fast way than dialogue and compromise in solving problems, 2) Distinct comparison of characters between good and bad man, male and female appeared on the stage will put narrow-minded sense of value such as black and white logics to children. 3) Behavior and means of the star in drama brings often to good result even if behavior and means are wrong and this kind of notion will put into mind of most children than it can be justifiable to rationalize their object even if behavior and means are wrong. 4) Education program was made up mostly for entertainers and much of amusement, and children only take part of program very passively. 5) Bad slang and meaningless foreign words are often used in program and it makes children imitate wrong words, custom and behavior. Writing on the limitations of this study, one can see the period of content analysis and the period of the audience survey were almost 6 months apart. There was also a rescheduling of program during this period. These facts, along with the political changes that occurred during that period would be the limitations to this study. But these limitations probably were not that decisive considering the fact that the contents of television programs were relatively unchanged and that the questionnaire strived for an evaluation of the audience responses rather than a causal explanation.

Marketing channel system의 communication戰略

尹嬉重 이화여자대학교 한국문화연구원 1980 韓國文化硏究院 論叢 Vol.35 No.-

Today, marketing channels are among the most complicated phenomena encountered in the study of marketing since marketing channels encompass behavioral systems involving many decision markers and often extend over a wide geographical area. For this reason, as integrated systems approach is inevitable to the overall understanding in the structure and functions of communication in modern marking channels. This thesis utilizes an integrated systems approach as the analytical framework for studying and understanding communication in marketing channels. Generally, communication strategy occupies a pivotal position in the overall marketing mix of the firm. The ingredients that make the marketing alive, effective and dynamic lie in the realm of communication. However, it is important to point out here that the types of information flow in marketing channel systems that are of primary importance closely parallel the functions of marketing. It is the role of communication to inform and persuade the potential consumer that other elements of the marketing mix-product, price and physical distribution are worthy of consideration in purchasing decisions. Therefore, the planning of communication strategy in marketing channels necessarily takes place within the development of basic marketing goals objectives by top management. The thesis consists of six chapters. The first chapter is introductory. Its purpose is to explain the reasons that this sort of work should be undertaken. The second chapter provides both the conceptual foundation of marketing and a descriptive overview of marketing from a historical developmental approach. The third chapter develops the concept of the channel as an operating systems and analyses specific structure of channel systems. While introducing the meaning of marking channels here, the rationale for the systems approach to marketing channels is also examined. The fourth chapter describes the selection and control of communication in marketing channels. This chapter also examines the reasons for conflict and their resolution within the marketing channel system. The fifth chapter points out that the internal and external information flows within channel links are necessary for effective operations and that persuasive communication among channel links is necessary in order to gain response from either a channel member or the ultimate consumer. Chapter five also analyses both the role of research as communication feedback in the channel process and the decision strategy to be employed in the actual design of the channel network. The sixth chapter concludes with an analysis that may influence the role of channel members and finally presents here the methods to improve or develop effective communication strategies in marketing channel systems today.

직렬형 PWM 인버터를 이용한 동적전압보상기에 관한 연구

배정환,한병문,한경희,김희중 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-

This paper presents a novel compensation method for the voltage sag problem for a critical load. This method is able to restore the supply voltage to the original magnitude and shape by injecting the vector diffence between the desired voltage and the actual voltage. The proposed system consists of a dc energy storage device, dc-ac converter, and a coupling transformer to inject the output of the inverter in series with the line. It can make up for the weakness of UPS and SPS. The operation of this system is verified by the computer simulation with EMTP code and experimental work with a scaled model. The advantages of this new system over the existing system are the fast reaction time and the low compensation energy in operation.

柔軟性에 의한 제조시스템의 評價 模型

하정진,이창섭,김성희 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2

Flexibility has become a key objectives in the design of manufacturing systems and a critical measure of total manufacturing performance. The need for flexibility is increasing due to some environmental change such a changing technical characteristics of the products and the changing nature of market demands. Most importantly, flexibility embodies competitive value for a manufacturer. Therefore, the objective of this research is to offer a definition of flexibility as well as proposing a scheme for assessing the value of flexibility, one of the performance measures of manufacturing systems.

Porphyromonas endodontalis의 침투에 따른 혈관 내피세포의 유전자 발현

공희정,최경규,박상혁,이진용,최기운 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.6

During the last two decades, there has been an increasing interest in the impact of oral health on atherosclerosis and subsequent cardiovascular disease (CVD). To date, some periodontal pathogens including Porphyromonas gingivalis (P. gingivalis) have been reported to be relevant to CVD. Porphyromonas endodontalis (P. endodontalis), which shares approximately 87% sequence homology with P. gingivalis, is mostly found within infected root canals. However, recent studies reveal that this pathogen also resides in the dental plaque or periodontal pocket in patients with periodontitis. It has been shown that P. endodontalis invades human coronary artery endothelial cells (HCAEC) and coronary artery smooth muscle cells (CASMC). To evaluate whether P. endodontalis can participate in the progression of atherosclerosis and CVD, we examined the changes in transcriptional gene expression profiles of HCAEC responding to invaion by P. endodontalis in this study. The following results were obtained. 1. Porphyromonas endodontalis was invasive of HCAEC. 2. According to the microarray analysis, there were 625 genes upregulated more than two-folds, while there were 154 genes downregulated by half. 3. Upregulated genes were relevant to inflammatory cytokines, apoptosis, coagulation and immune response. Enhanced expression of MMP-1 was also noticeable. 4. The transcription profiles of the 10 selected genes examined by real-time PCR agreed well with those observed in the microarray analysis. Thus, these results show that P. endodontalis presents the potential to trigger and augment atherosclerosis leading to CVD. 본 연구에서는 Porphyromonas endodontalis와 죽상경화증 및 심혈관질환과의 관계를 알아보기 위해, P. endodontalis가 사람의 관상동맥 내피세포에 침투했을 때 나타나는 유전자 발현의 변화를 microarray와 real-time PCR로 측정하였고, 발현이 증가된 유전자 중에서 죽상경화증과 연관된 유전자들이 관련 KEGG pathway 상에서 유의성 있는 영향을 미치는지를 분석하여 다음과 같은 결과를 얻었다. 1. Porphyromonas endodontalis는 사람의 관상동맥 내피세포에 침투하였다. 2. Microarray 분석결과, 대조군보다 발현이 2배 이상 증가된 유전자는 625개였고, 1/2이하로 감소된 유전자는 154개였다. 3. 발현이 2배 이상 증가된 유전자 중에는 염증성 cytokine 및 chemokine, 세포자멸사, 혈액응고와 면역반응 관련 유전자들이 포함되었다. 4. Microarray 분석결과를 확인하기 위해 발현이 2배 이상 증가된 유전자 중에서 10개의 유전자를 선택하여 real-time PCR을 시행하였고, 그 결과 microarray에서와 마찬가지로 발현 정도가 대조군보다 모두 높게 나타났다. 따라서 P. endodontalis가 사람의 관상동맥 내피세포에 만성적으로 작용했을 때, 심혈관질환에서 중요한 부분을 차지하는 죽상경화증을 유발하는 위험 요소 중의 하나로 작용할 수 있을 것으로 판단된다. 이와 관련된 자세한 기전을 이해하기 위해서는 앞으로 더 많은 연구가 필요할 것으로 보인다.