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무지의 수근중수관절과 중수수지관저르이 동시 골절 탈구 - 1례 보고 -
이치원,한성준,최호림,진병록,이상선 대한골절학회 1999 대한골절학회지 Vol.12 No.4
Simultaneous multiple dislocation of the thumb is a very rare injury. We experienced a case of simultaneous fracture-dislocation of the carpometacarpal and metacarpophalangeal joint of the thumb which was treated by closed reduction and percutaneous K-wire fixation. The clinical result was satisfactory.
Enhanced Germination of Echinacea angustifolia Seed with Ethephon and Sodium Hypochlortie Treatment
이치원,소인섭,정성우,허무룡 경상대학교 농업생명과학연구원 2010 농업생명과학연구 Vol.44 No.3
The influence of sodium hypochlorite and ethephon on the germination of narrow-leaved purple coneflower (Echinacea angustifolia) was investigated. Treatment of seeds with ethephon (1 mM) for 2 h followed by soaking in 0.525% sodium hypochlorite greatly increased germination (>90%). The treatment of seed with a combination of sodium hypochlorite and ethephon shortened number of days required to reach 50% of the final germination (T₅₀) from 4.2 days in control to 1.1 days. Seedlings grown from ethephon-treated seeds had shorter and thicker hypocotyls and roots with higher dry weights compared to the control. The same trend was observed during seedling emergence from soil. Ethephon treatment longer than 2 h resulted in weaker seedlings, probably due to leaf senescence. Anthocyanin content in seedling leaves increased linearly from 0.04 mg/g fresh weight in control to 3.72 mg/g fresh weight in 24 h treatment as the time of seed exposure to ethephon increased. Seed treatment with bleach and ethephon may well be practiced to facilitate the establishment of E. angustifolia in the field
Computational Discrimination of Breast Cancer for Korean Women Based on Epidemiologic Data Only
이치원,이정찬,박보영,배종희,임민혁,강대희,유근영,박수경,김유단,KIMSUNGWAN 대한의학회 2015 Journal of Korean medical science Vol.30 No.8
Breast cancer is the second leading cancer for Korean women and its incidence rate has been increasing annually. If early diagnosis were implemented with epidemiologic data, the women could easily assess breast cancer risk using internet. National Cancer Institute in the United States has released a Web-based Breast Cancer Risk Assessment Tool based on Gail model. However, it is inapplicable directly to Korean women since breast cancer risk is dependent on race. Also, it shows low accuracy (58%-59%). In this study, breast cancer discrimination models for Korean women are developed using only epidemiological casecontrol data (n = 4,574). The models are configured by different classification techniques: support vector machine, artificial neural network, and Bayesian network. A 1,000-time repeated random sub-sampling validation is performed for diverse parameter conditions, respectively. The performance is evaluated and compared as an area under the receiver operating characteristic curve (AUC). According to age group and classification techniques, AUC, accuracy, sensitivity, specificity, and calculation time of all models were calculated and compared. Although the support vector machine took the longest calculation time, the highest classification performance has been achieved in the case of women older than 50 yr (AUC = 64%). The proposed model is dependent on demographic characteristics, reproductive factors, and lifestyle habits without using any clinical or genetic test. It is expected that the model could be implemented as a web-based discrimination tool for breast cancer. This tool can encourage potential breast cancer prone women to go the hospital for diagnostic tests.
공단지역 일부 주민들의 주택유형 및 실내/외에 따른 VOCs(Benzene, Toluene, Xylene) 농도 및 상관성에 관한 연구
이치원,전혜리,홍은주,유승도,김대선,손부순,Lee, Che-Won,Jeon, Hye-Li,Hong, Eun-Ju,Yu, Seung-Do,Kim, Dae-Sun,Son, Bu-Soon 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.5
The objectives of this study were to understand the characteristics of residents in industrial areas and factors affecting exposure to the Volatile Organic Compounds(VOCs : Benzene, Toluene, Xylene) as well as to assess exposure levels according to house-type, and whether residents were indoors or outdoors. This research was designed to assess the differences in exposure levels to indoor, outdoor and personal VOCs in a case group and a control group across all areas, as well as in each different area, from May to October 2007, in. 110 residents of the G, Y and H industrial areas of the Jun-nam province. The geometric mea-levels of airborne benzene for the case group 1.31part per billion(ppb) indoor, 1.29 ppb outdoor, and 1.32 ppb for personal exposure were significantly higher than for the control group 0.99, 0.87 and 0.57 ppb, respectively. The geometric mean level for toluene personal exposure across the G, Y and H areas was 5.70 ppb for the case group and 6.31 ppb for the control group. While the outdoor level was 4.27 ppb for the case group and 5.06 ppb for the control group, The indoor level for the case group was 4.78 ppb, similar to that of the control group 4.69 ppb. The geometric mean levels for airborne xylene across the G, Y and H areas were 0.16 ppb(outdoor), 0.12 ppb(personal exposure) and 0.10 ppb(indoor) for the case group, and for the control group were 0.17(personal exposure) and 0.09 ppb(indoor and outdoor). The indoor/outdoor(I/O) ratio for case group is 1.19, while that of the control group is 1.15, indicating that the indoor level was higher than the outdoor level. The interrelationship differences among the three different types of levels in the air in the G, Y and H areas are statistically significant, except for the difference between the indoor and outdoor figures for xylene. In terms of the different types of houses and energy type uesd, the geometric mean level for airborne benzene, toluene and xylene for houses were 1.61, 5.39 and 0.12 ppb, respectively. while the figures for flats were 0.67, 3.32 and 0.05 ppb, respectively. Outdoors, the levels of benzene and toluene in flats were 0.71 and 2.62 ppb, respectively. and 1.58 and 5.35 ppb in houses. For personal exposure, the house levels of benzene, toluene and xylene were all higher than for flats. Houses using oil for heating have significantly higher levels than flats, which use gas for heating.
이치원,한성준,최호림,최원태,이상선 대한골절학회 1999 대한골절학회지 Vol.12 No.4
Axial dislocation of the carpus is a rare injury, and it usually is caused by crush mechanism in industrial fields. We experienced a case of axial-ulnar fracture-dislocation of the carpus which was treated by open reduction and internal fixation with K-wires and external fixator fixation.
이치원,한성준,최호림,최원태,이정웅,전재균,이상선 대한골절학회 2000 대한골절학회지 Vol.13 No.1
Purpose : To evaluate the results of operative treatment for intercondylar fracture of the distal humerus in adults. Materials and Methods: From February 1994 to June 1998, 15 patients with more than one year follow-up periods were treated by operative method at Sun General Hospital. 12 of them were treated by open reduction and internal fixation(dual plate for 8, screw & K-write for 4) and 3 of them by open reduction & Ilizarov fixation. Open or closed fracture and AO classification of fracture were considered as a prognostic factor. The functional results were analyzed by Jupiter's critera. Results: There were 2 excellent, 2 good in C1 type, one excellent, 2 good, one fair and 2 poor in C2 type, and one excellent, 2 good, 2 poor in C3 type. And there were one good and one poor in 2 open fractures and 4 excellent, 5 good, one fair and 3 poor in closed fractures. The average range of motion of the elow joint was 85�(30�-115�). Overall results show excellent and good in 67%(10 of 15) and poor in 27%(4 of 15). Conclusion: It's not easy to get satisfactory results in treatment for intercondylar fracture of the distal humerus. We suggest that more efforts are needed to get anatomical reduction, rigid internal fixation and early joint motion in interconylar fracture of the distal humerus.
Kerr Lens 모드 록킹 되는 대칭형 Ti : sapphire 레이저 공진기의 이론적 해석
이치원,윤석범 공주문화대학 1999 공주문화대학·논문집 Vol.26 No.-
Theoretical analysis for the spot size and the Kerr Lens Mode Locking(KLM) strength can be represented as explicit function of the position in the laser cavity, the intra cavity laser power, and the stability parameter. The results were suggested that the KLM strength achieves its maximum value at the edge of the stability range. Also simultaneously obtaining a laser pumping efficiency and KLM behavior is possible for symmetrical Z-type laser cavity.
Nd:YAG 레이저로 펌핑되는 Cr^(4+) : YAG 레이저에 관한 연구
이치원 공주문화대학 2000 공주문화대학·논문집 Vol.27 No.-
A continuous-wave(CW) output power performance of a Cr^(4+) : YAG laser pumped by a Nd:YAG laser was reported as a function of output coupling transmission, emission spectra and tuning wavelength. With an output coupler of 1% transmission, the output power at 1.45㎛ was reached at least 400mW. Slope efficiency of 8%, when the gain medium was cooled to 20℃. The tuning range was from 1.405㎛ to 1.505㎛ and the maximum output power was 200mW at 1.46㎛ with a birefringent filter in a cavity. Also the linewidth was 0.21nm.