[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.

만성 통증 질환들의 새로운 분류 및 진단 기준 : 류마티스 관절염, 섬유근육통 및 척추관절염

김근태 고신대학교 의과대학 2011 고신대학교 의과대학 학술지 Vol.26 No.1

Rheumatoid arthritis, fibromyalgia, and spondylarthritis are important diseases causing chronic pain and disability in rheumatologic areas. The classification and diagnostic criterias of them were made on the basis of clinical features, radiologic and laboratory findings and have been used decades ago. According to the development of new knowledge about etiology and pathogenesis of rheumatic diseases, the need for new criteria has been increased. In recent years, new criteria for these diseases have been developed, and they allow the early assignment of diseases and early start of therapy. In this review, the author summarizes recent advances and changes in diagnosis of rheumatoid arthritis, fibromyalgia, and spondylarthritis.

신피질 세포에서 organic hydroperoxide에 의해 유발된 세포사망

김근태 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1

Background : Previous studies have shown that the hydrogen peroxide induces the cell injury through a lipid peroxidation-independent mechanism in renal epithelial cells. This study was therefore undertaken to examine the roles of lipid peroxidation in t-butylhydroperoxide (tBHP)-induced cell death to renal epithelial cells. Methods : Opossum kidney (OK) cell cultures, a renal tubular epithelial cell line, were used as the renal epithelial cell model. tBHP caused cell death in a dose-dependent manner over the concentration range of 0.05-2 mM. Results : The cell death was effectively prevented by the hydroxyl radical scavenger (dimethylthiourea), iron chelators (deferoxamine and phenanthroline), and antioxidants (DPPD and BHA), but not by the hydrogen peroxide scavenger catalase. tBHP caused a marked increase in lipid peroxidation, which was completely inhibited by DPPD and deferoxamine. tBHP-induced ATP depletion was prevented by deferoxamine and DPPD. Similar protective effects of antioxidants were observed in cell death induced by cumene hydroperoxide, another organic hydroperoxide. However, inorganic hydroperoxide (H2O2)-induced cell death was not altered by antioxidants. tBHP-induced apoptosis was prevented by DPPD and deferoxamine. Conclusions : These results indicate that organic hydroperoxide induces cell death through a lipid peroxidation-dependent mechanism, unlike inorganic hydroperoxide, in renal epithelial cells. 배경:신장 세뇨관 상피세포에서 inorganic hydroperoxide 인 H2O2가 lipid peroxidation-independent mechanism을 통해 세포 상해를 유도한다는 이전 연구 결과가 있었고, 본 연구에서는 신장 세뇨관 상피세포에 organic hydroperoxide인 t-butylhydroperoxide (tBHP)에 의해 유도된 세포사망에 있어 lipid peroxidation이 어떤 역할을 하는지 조사하였다. 방법 : 신피질 세포로는 Opossum Kidney (OK) cell이 이용되었다. tBHP는 0.05-2mM의 범위에서 농도 의존적으로 세포사망을 유도했다. 이러한 세포사망이 hydroxyl기 제거제인 dimethylthiourea, iron chelator인 deferoxamine과 phenanthroline, 항산화제인 DPPD와 BHA, 그리고 H2O2 제거제인 catalase에 의해 어떠한 차이를 나타내는 지를 관찰하였다. 결과 : 세포사망은 dimethylthiourea, deferoxamine과 phenanthroline, DPPD와 BHA에 의해 효과적으로 방지되었으나, catalase에 의해서는 방지되지 않았다. tBHP는 lipid peroxidation을 확연하게 증가시켰으며 이러한 효과는 DPPD와 deferoxamine에 의해 완전히 억제되었다. 또 tBHP에 의해 유도된 ATP 소모도 deferoxamine 과 DPPD에 의해 방지되었다. 항산화제의 이와 같은 방지효과가 다른 organic hydroperoxide인 cumene hydroperoxide에 의해 유도된 세포사망에서도 나타났으나, H2O2에 의해 유도된 세포사망은 영향을 받지 않았다. tBHP가 apoptosis를 유도하였으며, 이는 DPPD와 deferoxamine에 의해 방지되었다. 결론 : 이상의 결과는 신장 세뇨관 상피세포에서 organic hydroperoxide가 inorganic hydroperoxide와 달리 lipid peroxidation-dependent mechanism을 통해 세포사망을 유발함을 의미한다.

강낭콩의 식물체 부위와 생육시기에 따른 무기영양성분 함량과 흡수량에 대한 질소의 사용효과

오태근,이경아,송범헌 忠北大學校 農業科學硏究所 2012 農業科學硏究 Vol.28 No.2

This study was conducted to examine the nitrogen effects on uptake and utilization of major mineral nutrients of the kidney bean (Phaseolus vulgaris L.). The N treatments were five levels, 0, 3, 6, 9, 12 N kg/10a. The kidney bean was cultivated on the upland experimental field in the agricultural ???? research & extensions service of Chungbuk province. The contents and uptake amounts of mineral nutrients were investigated throughout the growth stages of the kidney bean. Higher content of total N in the stem was maintained until 8 days before flowering stage and then decreased gradually. Also, total N content of leaves was increased in the vegetative growth stage, and it was decreased rapidly to 8 days after the flowering stage, and then increased gradually to the initial maturity stage. Total N content of roots was tended to decrease until 8 days after the flowering stage, while that of seed was increased from the flowering stage to the maturity stage. The amount of uptake N of the shoot parts was increased until the flowering stage, maintained similarly from the flowering to 14 days after the flowering stage, and then increased rapidly to the maturity stage, while that of root was increased slowly to the flowering stage and then maintained similarly to the maturity.

측두하악 관절의 재건을 위한 늑연골 이식의 효과

김태규,정기돈,신상훈,김성길,이성근,박상준,서종천 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.3

We performed costochondral grafting in mmandibular reconstruction including condyle replacement in 5 patients which have 4 cases of ameloblastoma, 1 case of resorption of left condyle due to osteomyelitis. We harvested the 6 th costochondral cartilage of unaffected side. No specific complications were appeared with unexpected fracture of costochondral junction and infection of operation site, These patients show 30-45mm at month opening, near normal of affected side, near normal or normal of unaffected side at lateral excursion. Postoperative coureses was uneventful with improved cosmetic and functional results. Our report is indicated that the costochondral graft is satisfactory to reconstruct mandibular defect including condyle replacement, especially in growing patients.

초등학교의 방과후 보육 프로그램에 관한 기초 연구

정태근,김명철 釜山敎育大學校 學生生活硏究所 1995 學生指導硏究 Vol.16 No.-

Abstract While the administration of After-school Care Program is the increasing places in social welfare facilities, children's house, and A study room, the most of parenta require that it is administrated in elementary school. Nevertheless, it was not administrated not only in elementary school, but also it was not developed. Therefore, The purpose of present study is to provide basic data needed for the development of After-school Care Program for lower grades. First, The Characteristics of After-school Care Program are to protect and control children, complement and supplement school-education goals, and divert children's mind through diverse special and learning activities. Also, it is a pure local-society program. Second, The goals of After-school Care Program are to cultivate a secure protection and interest in schoolwork, and a consciousness of community through a diverse and creative activities and vital plays, and on a close relationship with school, home, and local society. Third, The contents of After-school Care Program are consisted of selective activity, learning activity, consulting activity, friendly relation-activity, physical activity, a work activity, and an event activity. While the administration of After-school Care Program is the increasing places in social welfare facilities, children's house, and A study room, the most of parenta require that it is administrated in elementary school. Nevertheless, it was not administrated not only in elementary school, but also it was not developed. Therefore, The purpose of present study is to provide basic data needed for the development of After-school Care Program for lower grades. First, The Characteristics of After-school Care Program are to protect and control children, complement and supplement school-education goals, and divert children's mind through diverse special and learning activities. Also, it is a pure local-society program. Second, The goals of After-school Care Program are to cultivate a secure protection and interest in schoolwork, and a consciousness of community through a diverse and creative activities and vital plays, and on a close relationship with school, home, and local society. Third, The contents of After-school Care Program are consisted of selective activity, learning activity, consulting activity, friendly relation-activity, physical activity, a work activity, and an event activity.

자금제약하에서 부분적으로 수리가능한 동시조달부품들의 구매량 결정

오근태,차상원 수원대학교 산업기술연구소 2004 산업기술연구소논문집 Vol.19 No.-

In this paper partially repairable concurrent spare parts requirement determination problem of newly procured equipment systems is considered. "partially repairable" means that a portion of damaged parts can be recover their function and reused after repairs. A mathematical model is derived for making an CSP requirement determination subject to the constraint of satisfying any given fund limitation. We assume that the failure of a part follows a Poisson process and the repair time has an exponential distribution. The problem is formulated as the operational availability maximization problem that should satisfy the funds limitation, and then, using the generalized Lagrange multipliers method, the optimal solution procedure is derived.

GIS를 이용한 관광자원관리시스템 구축 및 활용에 관한 연구

김태근,조영환 목포대학교 연안환경연구소 2000 沿岸環境硏究 Vol.17 No.1

Recently tourism is put on the important role in central and local government affairs. But there is no effective Tourism Resources Management System in existing tourism. At this point of view, the first priority must be put to make inventory system(DBMS) of tourism resources and the next thing is how to handle this Inventory system for satisfying tourists and managers who work in the field of tourism The most significant problem of existing tourism system is not to have proper interrelationship of location data and its resources data of tourism, so the tourists are not easy to make their sense for planning tour program. Needless to say, it is more serious problem to managers. This study was focused on the application of GIS(Geographic Information System) for establishment for efficient Tourism Resources Management System. GIS application showed good performance in handling inventory data for decision making. All the data used for the GIS application was divided into location and non-spatial data. Using location data. it was easy to find the exact location for tour on the monitor and on the maps generated by the computer, even in the actual managed site, along with various attribute data. It was easy to store, manage and update the data and to keep the data which could be washed away by the time. By manipulating the menu driving system, it was also very easy to access the Tourism Information System for users including new managers as well as tourists.

주어진 예산내에서 수명과 수리를 고려한 동시조달부품의 구입량 결정

오근태 水原大學校 2012 論文集 Vol.26 No.-

In this paper considered is the provisioning quantity determination problem of repairable concurrent spare parts(CSP) of a new equipment system to maximize the operational availability under budget constraint and cannibalization allowed. When a part fails, repair of the failed part is possible and the part is replaced and cannibalization is allowed. The failure of a part is assumed to follow a Poisson process and the availability in CSP is defined. The solution procedure consists of two parts. Firstly, a mathematical model is developed under the assumption that the failure rate is constant during the CSP period. Secondly, proposed is a simulation search procedure which improves the heuristic solution to the near optimal solution in a reasonable amount of time.

Stented Graft의 임상경험

권태원,김호성,김도균,성규보,조용필,김건언 대한혈관외과학회 2000 Vascular Specialist International Vol.16 No.2

Purpose: Endovascular repair is a alternative treatment with favorable short-term result, but long term results are not available compared to standard operation. The authors have reviewed experiences of Asan Medical Center on stented graft, performed from Aug. 1998 to Feb. 2000, and the results as to age, operative indication, clinical condition, anatomic location, complication, follow-up are reported. Method: Seven patients who has received stented graft between Aug. 1998 and Feb. 2000 are reviewed retrospectively. Result: Of the seven patients, 6 were male and 1 was female. The mean age was 46.4 years (17~71). Indication for stented graft were two pseudoaneurysms, two iatrogenic arterio-venous fistulas, one thoracic aorta aneurysm, one abdominal aortic aneurysm, and one iliac artery occlusion with blue toe syndrome. Three different types of stented graft devices were utilized: Dacron-covered nitinol stented graft (made by the Asan Medical Center medical device team), Vanguard II (by Boston Scientific Corp.), and PTFE with nitinol stented graft (by Tae-woong). There was no perioperative mortality, and the technical success was achieved in five cases (71%). The patency at 14-month were 1009o (5/5). Two immediate complications are hemorrhage due to iliac & femoral artery avulsion requiring emergency bypass grafting, and deployment failure of stented graft requiring removal of retained graft device. Conclusion: Stented graft may be utilized even in complicated vascular situation but will need further development of device and more experience to prevent possible catastrophic complication. Indication should be decided by team approach and vascular surgeon should be prevent or participate during the procedure.