[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.

豚 Pepsin의 凝乳特性에 關한 硏究

尙炳贊 충남대학교 대학원 1975 論文集 Vol.5 No.-

These studies were carried out to investigate the properties of swine pepsin as milk-clotting enzyme and its utilization in the process of cheese making. The results were summarized as follows. 1) The optimum temperature for milk-clotting activity of swine pepsin was appeard at 40∼45℃, and the swine pepsin was completly inactivated at higher than 60℃. 2) The optimum pH for milk-clotting activity of swine pepsin was pH 4.0∼5.0, and the swine pepsin was comppletly inactivated at higher than pH 6.0 3) When the pepsin solution was treated by heating at 30∼70℃ for 10 minutes, pepsin activity was decreased seriously at 50℃, and it was completly inactivated at 60℃. 4) The higher keeping temperature and longer storaging period of the pepsin solution was showed the less milk-clotting activity. 5) Sodium propionate and Potassium sorbate were the most effective antiseptics for the preservation of the pepsin solution. 6) When the pepsin solution was exposed sunlight for 9hours, 26.5% of the enzyme activity was decreased. 7) Various animal serums were decreased the activity of the swine pepsin, especially swine serum of them was showed the most inactivity effect. 8) When 0.1㎖ of soy bean extract was added to 0.2㎖ of pepsin solution, 83% of pepsin activity was decreased. 9) Ammonium sulfate of the various saturated salt solutions was showed the most inactivating effect, but heavy metal salts were showed the activating effects. 10) The higher concentration of CaCl₂ in milk showed the higher milk-clotting activity of the pepsin. When 0.02% of CaCl₂ was added to milk, 43.4% of the pepsin activity was increased. 11) The curd weight per milk weight obtained 10.80% from swine pepsin, and 11.40% from rennet. But the difference between these was no significant.

韓國女學生의 身體發育에 關한 硏究 : 1918年부터 1978年까지

成鍾林,林炳奎 圓光大學校 附設 體力科學硏究所 1980 體力科學硏究 Vol.3 No.-

A conclusion inferred from the observation of the genral developing process caculated by year-to-year increasing rate by age. Developing speed and rate by times and age on the basis of body measure value(height, weight, girth of chest, height in seating) released by the authorities concerned then in pursuit of studies on the physical development of Korean girl students (7 yrs, to 17) for about 60 yrs., that is-during 1918 though 1978. : 1. Prematuration of development appering in spurt phenomenon by age : 15yrs. to 16 early Japanes occupation period, 13yrs. to 14 between late period and civil war (Korean War) period, and 12yrs. to 13 between Revolution period on May 16 and the present. 2. A rapid increase of developing speed and rate on the common parts of height, weight, girth of chest and height in seating shows itself on the periods between Civil Ear and Revolution, and a slight decrease between Pre-Japaness occupation period and post-. 3. The average increasing rate of body measure value for about 60 yrs. -from the Pre-Japaness occupation period to the present-is 13.6cm in height (Japaness girl 15.8cm), 9.2kg in weight (10.6kg), girth of chest 9.4cm(8.4cm) and height in seating 9.9cm for about 30 yrs. (2.9cm) 4 The developing trend in 7, 13 and 16 yrs. appears no change or a slight increasing during Japaness occupation period, a little decrease in Civil War, and then a rapid increase until Revolution period is shrinking little at present.

광중합형 레진에서 초기 저광도 광중합 및 연마 시기가 변연부 미세 누출에 미치는 영향

노병덕,정일영,이상훈 大韓齒科保存學會 2000 Restorative Dentistry & Endodontics Vol.25 No.1

알코올 의존 환자들의 가정 폭력

박병강,김종성 충남대학교 의학연구소 2001 충남의대잡지 Vol.28 No.2

Alcohol has been suggested to be the principal risk factor for violence. However, few studies have been performed on domestic violence in the context of alcoholism. Authors reviewed the domestic violence patterns of 125 male alcoholics and following results were obtained. 1. The rate of domestic violence in alcoholics during 1-month period prior to admission was 53.6% and the statistically significant factors related to the rate of violence included patient's age(P<0.01), presence of psychiatric diseases(P<0.05), and adaptability of family(P<0.05). 2. The violence patterns showed verbal aggression only(43.4%), verbal and physical aggression(35.8%), and the combination of verbal, physical aggression and weapon use(42.3%). The violence pattern were significantly related to the victim's coping styles to the violence(P<0.05). 3. The objects against which violence was done were spouse and offsprings(40.3%), parents(32.8%), objects as in window smashing(l7.9%) and non-cohabitant(11.9%). The statistically significant variables related to violence objects were marital status(P<0.01) and the family's APGAR scores(P<0.05). 4. Drunken state preceding violence was 83.6% and its statistically significant variable was the victim's coping style(P<0.001). The above results have suggested that comprehensive point of view considering alcoholism as a disease of an alcoholic's whole family and not an individual alcoholic, is required as we approach its treatment.

광대역 고출력 공간 전력 증폭 소자에 관한 연구

이성호,권세웅,이병무,윤영중 연세대학교 산업기술연구소 2002 논문집 Vol.33 No.2

In this paper, spatial amplifier using wideband printed dipole antennas is proposed for spatial power combining. The input and output printed dipole antennas have wide bandwidth of 22 %(5.44 ㎓∼6.75 ㎓) and 26.3 %(5.2 ㎓∼6.78 ㎓), respectively. Gain of the designed amplifier is 9.5 ㏈ at 6 ㎓. As a result, the proposed spatial amplifier using wideband printed dipole antennas and amplifiers shows that the gain is 16.8 ㏈ at 6 ㎓ and 3-㏈ gain bandwidth is 1.04 ㎓.

상아질 접착제의 두께가 치아와 복합레진 경계의 응력발생에 미치는 영향에 관한 유한요소법 연구

박상일,김예미,노병덕 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.5

이 연구의 목적은 5급 와동의 복합레진 수복에서 상아질 접착제를 비교적 두껍게 도포하거나 낮은 탄성계수(low elastic modulus)를 가진 복합레진을 선택하는 방법을 택하여 수복물의 탄성율의 차이에 따른 치아와 복합레진 경계에서 발생하는 응력의 차이를 알아보는 것이었다. abfraction 병소가 있는 하악 제 1소구치를 유한요소법을 이용하여 모델로 만들었다. 병소는 상아질 접착제의 두께 (50㎛, 100㎛, 150㎛) 및 복합레진의 종류를 달리하며 수복되었다. 170N의 교합압을 협측 또는 설측에서 가하여 상아질 접착제와 치아면에서의 Von Mises stress를 측정하였다. 상아질 접착제의 두께가 두꺼울수록 상아질 접착제면에 가해지는 Von Mises stresss 는 감소하였다. 낮은 탄성계수 값을 가진 복합레진에서 Von Mises stress가 더 작았다. 치근상아질 경계 (margin)가 법랑질 경계에서보다 더 큰 응력이 발생하였다. 상아질 접착제면에 작용하는 교합압의 영 향을 감소시키기 위해 상아질 접착제를 두껍게 바르거나 낮은 탄성계수 값을 가진 복합레진을 사용하는 것이 추천된다. The aim of this study was to examine that thick dentin bonding agent application or low modulus composite restoration could reduce stresses on dentin bonding agent layer. A mandibular first premolar with abfraction lesion was modeled by finite element method. The lesion was restored by different composite resins with variable dentin bonding agent thickness (50㎛, 100㎛, 150㎛). 170N of occlusal loading was applied buccally or lingually. Von Mises stress on dentin bonding agent layer were measured. When thickness of dentin bonding agent was increased von Mises stresses at dentin bonding agent were decreased in both composites. Lower elastic modulus composite restoration showed decreased von Mises stresses. On root dentin margin more stresses were generated than enamel margin. For occlusal stress relief at dentin boning agent layer to applicate thick dentin bonding agent or to choose low elastic modulus composite is recommended.

내용 기반 뉴스 비디오 검색 시스템

황병곤,정성호 大邱大學校 科學技術硏究所 1998 科學技術硏究 Vol.5 No.2

In this paper, we propose a content-based news video retrieval system. And we propose efficient indexing and retrieval of news video using key frames. It is used in the experiments to demonstrate that text segmentation and text recognition are suitable for indexing and retrieval of relevant news video scenes in and from a video database. and we implemented the content based umage retrieval system that indexes and retrieves the images by extracting edges from the object.

소프트웨어 재사용의 전략적 추진 방안에 관한 연구

권성우,이병찬 啓明大學校 産業經營硏究所 1997 經營經濟 Vol.30 No.2

SUMMARY Since the late 1960s when the discussion about software crisis - the problem of building large, reliable software system in a controlled and cost-effective way - was risen, many methodologies have been introduced to solve that problem, and software reuse can be regarded as one of these efforts. Software reuse is using existing software components during the construction of a new software system. The types of components that can be reused are not limited to source code but rather may include design specification, documentation, module-level implementation, a variety of knowledge from all the development phases, and so on. In spite of its promise, software reuse has failed to become standard pratice for software construction. In light of this failure, the computer science community has renewed its interest from the late 1980s. Most of the research has focused only on the technical aspect of software reuse since then, and little attention to managerial considerations. A successful adoption of new technology in an organization, however, cannot be achieved only with technology itself, but rather together with managerial aspects. Therefore, we tried to find a business considerations for strategic implementation of software reuse. To achieve this goal, we first study the concept, history, and the effects of strategic implementation of software reuse from the point of management strategu, motivation, and organization structure. Finally, the case of Motorola company was analyzed. We tried to propose managerial guidelines for strategic implementation of software reuse, and this will be helpful to make plans for that and to decrease the chance of trial and error during the adoption phases of new technology. Since the late 1960s when the discussion about software crisis - the problem of building large, reliable software system in a controlled and cost-effective way - was risen, many methodologies have been introduced to solve that problem, and software reuse can be regarded as one of these efforts Software reuse is using existing software components during the construction of a new software system. The types of components that can be reused are not limited to source code but rather may include design specification, documentation, module-level implementation, a variety of knowledge from all the development phases, and so on. In spite of its promise, software reuse has failed to become standard practice for software construction. In light of this failure, the computer science community has renewed its interest from the late 1980s. Most of the research has focused only on the technical aspect of software reuse since then, and little attention to managerial considerations. A successful adoption of new technology in an organization, however, cannot be achieved only with technology itself, but rather together with managerial aspects. Therefore, we tried to find a business considerations for strategic implementation of software reuse. To achieve this goal, we first study the concept, history, and the effects of software reuse. And then we consider the managerial aspects of strategic implementation of software reuse from the point of management strategy, motivation, and organization structure. Finally, the case of Motorola company was analyzed. We tried to propose managerial guidelines for strategic implementation of software reuse, and this will be helpful to make plans for that and to decrease the chance of trial and error during the adoption phases of new technology.

도시근교자립형 실버타운 모델개발에 관한 연구

안상천,김병곤,최창환 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.1

As the result of this study, first, this study suggested the new residential pattern for the elder to make their matured social experience work and to stabilize their aged life, preparing the aging society. Second, this study suggested the development of independent silver town. This has the basic frame to attempt to support them economically by securing the auxiliary facilities within the complex and returning to the profitable business. Establishing the union between the residents in the complex can work as the means of a self-governing activity and the communication between neighborhoods. And, as the policy suggestion derived from this study, first, the necessity of developing the aged facilities located in the suburban is presented. The development within the greenbelt with this condition can be an example. Second, new establishing policy for the elder is needed. Because the expenditure of Korean government is confined to the free old-age facilities, in the case of constructing silver town, the difficult in the cost of construction will accrue. So, leading companies' turning to public-welfare service, and complementing and deciding the law through the political supports of government are needed seriously.