[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.

소아의 치은부 멜라닌 착색에 대한 치료 증례

이상호,김형태,박정현 大韓小兒齒科學會 1992 大韓小兒齒科學會誌 Vol.19 No.2

Normal color of the gingiva and other oral tissues is uniformly coral pink or a variation of pink and is produced by the vascular supply, the thickness, degree of keratinization of the epithelium and the presence of pigmented containing cells. Gingival pigmentation occurs as a diffuse, deep purplish and discoloration or as irregularly shaped brown and light brown patches. The most frequent cause of gingival pigmentation is melanin deposits. It may be appear in the gingiva as 3 hours after birth and is present in all normal individuals. Melanin oral pigmentation can be normal physioligic pigmentation as well as pathologic pigmentation. Disease that increase melanin pigmentation include the Addison's disease, Pertz-Jegher's syndrome, Albright's syndrome, Von-Recklinghausen's disease. Gingival pigmentation is eliminated by the mucogingival flap, gingivectomy, gingival graft, electrosurgery, laser surgery, deepithelialization. The treatment were done by deepithelialization with periodontal knife, scalpel, diamond stone. The technique is relatively simple and the less postsurgical discomfort, requires minimum time and effort. We observed almost normal gingival color and shape after postsurgical. Further, periodic recall check is needed for evaluation of repigmentation.

[논문]용접부의 피로 파손모드 평가에 대한 구조응력기법의 적용에 관한 연구

강성원,김명현,김정환 釜山大學校生産技術硏究所 2006 生産技術硏究所論文集 Vol.65 No.-

반복 하중을 받게 되는 하중전달형의 필릿 용접이음에서는 용접 토우부 뿐만 아니라 용입 부족부 선단에서도 응력집중을 일으키고 피로균열이 발생/ 전파하는 경우가 있다. 특히/ 용접 루트부에서 발생한 균열은 육안관찰이 불가능하고 초음파 탐상등에 의한 비파괴 검사에 의해서도 검출이 곤란한 경우가 많다. 이것은 중대한 손상을 일으키기 까지 방치되는 경우가 많기 때문에 용접 루트부에서 발생하는 균열에 대한 연구는 현재 활발히 진행되고 있다. 본 연구에서는 최근 유한요소 해석시 요소의 크기에 둔감하다고 알려진 구조응력 기법을 이용하여 용입 부족부를 가지는 하중전달형 필릿 용접부의 피로 파손모드를 평가하였다. 용접부 다리길이의 변화에 따른 사례 연구를 통하여 용접 루트부의 파손을 피할 수 있는 용접부 시공기준에 관한 연구를 수행하였으며 이에 대한 구조응력 기법의 적용 가능성을 검토하였다.

생활치에서 나타나는 치근단 병소 : 보존적 치료 후 자연치유

김현주,이승종,정일영,박성호 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.2

It is often presumed that apical periodontitis follows total pulp necrosis, and consequently root canal treatment is commonly performed. Periapical lesion development is usually caused by bacteria and its byproduct which irritate pulp, develop pulpitis, and result in necrosis through an irreversible process. Afterwards, apical periodontitis occurs. This phenomenonis observed as an apical radiolucency in radiographic view. However, this unusual case presents a spontaneous healing of periapical lesion, which has developed without pulp necrosis in a vital tooth, through conservative treatment.

自然言語範疇의 典型性判斷의 發達的 變化

成賢蘭 대구효성가톨릭대학교 1986 연구논문집 Vol.32 No.1

In the present study, category typicality judgment norms from 14 Korean natural language categories are presented for kindergraten, third-grade, sixth-grade, and college students. Subjects are first asked whether the presented exemplars are included as category members and rated them on a 3-point scale in terms of category typicality. The percentages of items included are increased with both age and typicality level increasis and age differences in the percentage of items included as category members were found primarily for the less typical items. The absolute level of typicality judgments increased with age, although correlation between the children's and college student's ratings were somewhat higher than the unadjustd. It was suggested that the present typicality norms would be useful to developmental investigation in children's processing of category information in Korea and to investigation of developmental feature of the internal structure of category and the principles of categorization.

요통 및 방사통 환자에서 고장성 식염수를포함한 경막외 주사 효과

김현배,김미정,최기섭,이상건 大韓再活醫學會 1999 Annals of Rehabilitation Medicine Vol.23 No.1

백색 발광 ZnS 박막 전기장 발광 소자의 제작 및 특성

현동걸,손상호,박태성,이동헌,이상윤 경북대학교 산업기술연구소 1990 産業技術硏究誌 Vol.18 No.-

The basic investigation on ZnS:P_rF_3 thin film electroluminescent devices was done, the phosphor(ZnS:P_rF_3) and the insulator(SiN_X:H) of which were deposited by electron beam evaporation and rf-plasma CVD, respectively. The red(650㎚) and blue(490㎚) light emission peaks were observed in the Electroluminescent spectrum. At the dopant concentration of 0.5mol%, the brightness of 90.6cd/㎡ was obtained under sinusoidal excitation of 1kHz.

신용장거래에서 신용장발행 중개의 법률관계와 중개은행의 책임에 관한 연구

한상현 남서울대학교 2010 남서울대학교 논문집 Vol.16 No.2

In Letter of Credit(L/C) transactions, it is general custom that primary issuing bank opens L/C. But, there is occasion that issuing bank does not open this, and other bank, which is locating in domestic, opens this Letter of Credit. It is known that this is intermediation of L/C issuing. In case intermediation of L/C issuance is achieved, It is representative that issuing bank is not contracting and correspondent contract with notifying bank specifying in Letter of Credit. Intermediation of L/C issuance is distinguished with mediation of L/C issuance and issuance of Third party L/C. In case intermediation of L/C issuance, The right of recourse and credit decision's target partner of counterpart intermediary banks become intermediary bank who requested issuance of a credit. Because counterpart intermediary bank opens Letter of Credit, if Applicant damaged, intermediary bank must pay all liability to counterpart intermediary banks. In this research, I analyzed legal relations of people concerned and legal problems on intermediation of L/C issuance, and the intermediary bank's responsibility concretely through Letter of Credit Transaction Agreement. Key Words : Letter of Credit, intermediary bank, L/C's reissuance

장애물과의 안전거리를 고려한 로보트의 충돌회피 경로계획

현웅근,최성률 호남대학교 정보통신연구소 1993 정보통신연구 Vol.2 No.-

A collision-free path planing algorithm based on heuristic graph search method with safe distance is proposed. The proposed algorithm searches a collision-free path in configuration space by A-like algorithm. For generating a smooth path, distance potential field is considered in heuristic function of A-like algorithm. And to reduce the computational complexity, free-space enumaration method is utilized. To show the validity of the proposed method, several examples for a mobile robot of point type are illustrated.

황화물의 화학수송반응에 관한 연구

현상훈,이강호 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.2

The flow method of a chemical transport reaction was examined to investigate the migration property of sulfides in the temperature gradient. The effect of reaction parameters on the transport amount of sulfides was analyzed using a model developed in this study. When I₂was used as a transport agent, SnS was more transportable than any other sulfides(i.e., CdS, ZnS, and PbS), while MnS, NiS and FeS gave no measurable transport. The experimental result showed that the mixture of α-ZnS and β-ZnS was effectively transported in the form of cubic β-ZnS single crystal (purity of about 100%), under the reaction conditions of the temperature gradient of 1273 →1023 K, initial iodine pressure of about 159 ㎜ Hg, and flow rate of 0.1 cc/sec.