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최성우,박종갑,김태윤,김형옥,김정원,강석진 ( Sung Woo Choi,Jong Gap Park,Tae Yoon Kim,Hyung Ok Kim,Chung Won Kim,Seok Jin Kang ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.5
Myofibroma and myofibromaiosis are uncommon, benign, mostly self-limiting, probably hamartomatous proliferation of myofibroblasts. These tumors are most often present at birth or before the age of 2 years with multiple ot solitary lesion. Adult cases are rare and most,ly showed as a solitary lesion. We present a case of solitary myofibroma that developed on the vertex of scalp in a 51-year-old man. The lesion was a mild tender and intermittent pruritic firm, pedunclated 1 1cm sized tumor. The iumor was diagnosed as myofibroma by light microscopy and immunohistochemistry. (Korean J Dermatol 1907;35(5): 1031-1035)
한국판 국제 소아천식 및 알레르기 질환 연구 설문지의 신뢰도 및 타당도 연구
최성우,주영수,김대성,김재용,권호장,강대희,이상일,조수헌,Choi, Seong-Woo,Ju, Yeong-Su,Kim, Dae-Sung,Kim, Jae-Yong,Kwon, Ho-Jang,Kang, Dae-Hee,Lee, Sang-Il,Cho, Soo-Hun 대한예방의학회 1998 예방의학회지 Vol.31 No.3
Recent increases of asthma and allergies in childhood made the need for a standardized approach to international and regional comparisons of their prevalence and severity. To address these issues, 'International Study of Asthma and Allergies in Childhood (ISAAC)' is currently underway. In Korea, 'Nationwide Study of Asthma and Allergies in Korean Children' began in 1995 according to ISAAC protocol. ISAAC written and video questionnaires were used in this survey, but their reliability and validity were not evaluated properly yet. In this study, our aim was to evaluate the reliability and validity of two kinds of questionnaires and their usefulness in international and regional comparisons. The test and retest of two questionniares were completed by male(n=110) and female(n=111) middle school students with two and three weeks interval each. Kappa(or weighted kappa) were calculated from each questions and validity coefficients were estimated from those statistics. In Korean version of written questionnaire, the questions for allergic rhinitis, atopic dermatitis, allergic conjunctivitis, and food allergy proved to have high kappa values (or weighted kappa values) and validity coefficients and they can be used in further studies without any correction. But some questions about asthma(especially nocturnal cough, wheezing in exercise, and severe asthma) and drug allergy need to be revised for better under-standing to study subjects. Video questionnaire has the same degree of reliability and validity when compared to written questionnaire and this is the unexpected result. Accordingly, it also need to be revised to overcome the racial and cultural differences of the study subjects. In conclusion, the Korean version of written and video questionnaires may be considered to be useful methods in international and regional comparisons of asthma and allergic diseases in childhood after correction of some questions.
최성우,김종원,Choi, Sung-Woo,Kim, Jong-Won 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.9A
본 논문은 HomePNA 2.0 모뎀 칩을 위한 모뎀 수신부의 구조를 제안한다. HomePNA 2.0 전송 채널은 브릿지 탭과 HAM 대역의 영향 등으로 매우 열악하다. 이러한 채널을 통해 전송을 가능하게 하기 위해 HomePNA 2.0 은 훈련신호를 사용하여 매 프레임 마다 채널을 등화하고 FD-QAM 전송 방식을 선택적으로 사용한다. 따라서 모뎀 수신부는 일반적 QAM 방식 신호의 북조 기능과 함께 이러한 전송 방식의 특정을 최대한 상려 모뎀 수신 성 능을 극대화 히는 구조가 필요하다 연구 결과 모뎀 수신부의 가능을 송수신 상태에 따라 정상 수신 모드와 충돌 감지 오드의 2 가지로 정의 하였다 본 논문은 특히, 모뎀 수신부를 구성하는 핵심 블록인 등화기와 위상 동기부, 프레임 동기부에 대해서 사용된 알고리즘을 밝혔으며, 버스트 방식 모뎀의 채널 등화 성능을 높이고 안정적으로 동작 시키기 위한 구조를 제얀 하였다 마지막으로 제안된 모뎀 수신부의 성능을 분석하기 위해서 SPW 모델을 사용하여 채널 별 전송 가능 속도를 예측 하였다. In this paper, we propose the architecture of modem receiver to fabricate HomePNA 2.0 chip. HomePNA suffers from inferior channel because of bridge tap, the effect of amateur HAM band and so on. To transfer data over such channel, HomePNA 2.0 uses training sequence to equalize channel and uses FD-QAM optionally as modulation method. So modem receiver demodulate QAM based signal and needs optimum architecture that fully uses these transmission feature. As a result of research, we define 2 mode function of modem receiver depending on TX/RX state. In this paper, particularly, we show the algorithm of equalizer, carrier phase recovery and frame synchromzationblock and propose architecture that improve the performance of channel equalization and is stable in operation. In the end, we estimate the performance of proposed HomePNA2.0 modem receiver over HomePNA TEST LOOP using SPW program.
전라남도 거주 여성 중 사별군과 비사별군간의 건강행태 비교
최성우,이정애,신준호,신민호,Choi, Seong-Woo,Rhee, Jung-Ae,Shin, Jun-Ho,Shin, Min-Ho 대한예방의학회 2008 예방의학회지 Vol.41 No.4
Objectives: To compare the health behaviors of widowed women with those of currently married women. Methods: We randomly sampled the subjects from the Jeollanamdo Resident Registration Data and we then selected 2,331 widowed women and 4,775 married women. Well-trained examiners measured the height, weight, blood pressure and abdomen circumference, and the women were interviewed with using a questionnaire. Logistic regression analysis was used to estimate the odds ratios(OR) of the two groups. Results: The smoking rate (OR=2.46; 95% confidence interval [CI]1.65, 3.66) was significantly higher for the widowed women. On the contrary, the awareness rate of a smoking cessation campaign (OR=0.80; 95% CI=0.70, 0.92), a quit tobacco telephone line (OR=0.73; 95% CI =0.61, 0.88) and a quit smoking clinic (OR=0.74; 95% CI=0.62, 0.89) were lower for the widowed women. The rate of receiving a health exam (OR=0.80; 95% CI=0.70, 0.91), the rate of undergoing gastric cancer screening (OR=0.77; 95% CI=0.68, 0.88), breast cancer screening (OR=0.79; 95% CI=0.69, 0.89), cervix cancer screening in the last 2 years (OR=0.81; 95% CI=0.71, 0.92), colon cancer screening in the last 5 years (OR=0.74; 95% CI=0.63, 0.87) were significantly lower for the widowed women. Conclusions: This study revealed that the health behaviors are significantly different between the widowed women and the married women. To improve the health behaviors of the widowed women, further study and research that will investigate the socioeconomic and environmental factors that affect the health behaviors of widowed women will be needed.
최성우,양정은,장인강,김형옥,조성필 ( Sung Woo Choi,Jeung Eun Yang,In Gang Jang,Hyung Ok Kim,Seong Pil Joh ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.5
Basal cell carcinomas usually arise from the epidermis and show some epidermal connections. It is very unusual that basal celi carcinomas occur as subderrnal mass without epidermal connections. A 51 year-old female h;d an asymptomatic skin colored indurated plaque with linear old scar on the left side of nose fcr about 20 years. She had had a tumor that supposed to be a epidermal cyst, on the same site and the lesion was excised about 20 years ago. We performed the punch biopsy on her first visit which revealed hypertrophic scar. She was treated with intralesional injection of triamcinolone acetonide to reduce the size of hypertrophic scar. However, the lesion had not been reduced. She underwent the surgery to remove the scar at plastic surgery and the excisional biopsy showed a subdermal basal cell carcinoma. We recommend that the newly developed skin tumor in the pre-excised region should be required excisional biopsy instead of punch and close observation (KOfean J Dermatol 1997;35(5): 1036-1039)
최성우 ( Seong-woo Choi ) 한국모자보건학회 2020 한국모자보건학회 학술대회 연제집 Vol.2020 No.-
Purpose: This study assessed the growth and nutritional status of children in North Korean (NK) refugee families Methods: This study examined 301 children in NK refugee families. Their growth and nutritional status were estimated using the 2017 Korean National Growth Chart for Children and Adolescents. Stunting, being underweight, and wasting were defined as height-for-age (HAZ), weight-for-age (WAZ), and weight-for-height (WHZ) z -scores < -2.0, respectively. Results: The overall prevalences of stunting, being underweight, and wasting were 7.6%, 5.6%, and 5.0%, respectively. In children living in South Korea for < 5 years, the prevalences of stunting, being underweight, and wasting were 10.3%, 8.6%, and 3.4%, respectively, compared to 7.9%, 7.9%, and 0.0% for those living in South Korea for ≥5 years. The prevalences of WAZ and WHZ > 2.0 were 5.0% and 11.0%, respectively. Conclusion: Children in NK refugee families still suffer serious malnutrition after settling in South Korea, although being overweight is emerging as a new problem.
마이크로파를 이용한 황산세륨으로 개질화 된 SiC/Al₂O₃ 촉매의 CF<sub>4</sub> 분해 특성
최성우(Sung Woo Choi) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.12
마이크로파 열분해 시스템을 이용하여 Ce 담지량이 다른 알루미나 촉매의 CF4 분해에 대한 연구를 실시하였다. 마이크로파 발열체로는 실리콘카바이드를 사용하였다. 각 촉매의 결정상은 XRD로 관찰하였으며 CF4의 분해율은 GC-TCD를 사용하였다. 500℃ 반응온도에서 10 wt% Ce로 개질화한 알루미나가 개질화하지 않은 알루미나에 비해 CF4 분해율이 높았다. 반응속도상수 k값은 Ce(20)/Al₂O₃ = Ce(0)/Al₂O₃ < Ce(5)/Al₂O₃ < Ce(10)/Al₂O₃ 순이었다. XRD 패턴은 Ce(0)/Al₂O₃에서는 반응전후의 차이가 나타나지 않았으며 Al₂O₃의 결정구조만 관찰되었다. 반면에 Ce를 담지한 촉매에서는 산화알루미늄와 산화세륨의 혼합형으로 나타났다. 본 연구의 결과 Ce를 담지한 Al₂O₃촉매는 Ce를 담지하지 않은 촉매에 비해 동일한 분해율을 가지면서 반응온도를 200℃ 정도를 낮출 수 있음을 보여주었다. 또한 cerium sulfate의 적정비율은 5~10 wt%임을 보여주었다. Alumina-based catalysts with different Ce loadings were studied in the decomposition of CF4 using microwave heating system. Heating material of microwave system used Silicon Carbide. The crystallographic phases of catalysts were investigated by XRD and decomposition rates of CF4 were examined by GC-TCD. The catalysts of 10 wt% Ce modified Al₂O₃ showed higher CF4 decomposition rate than un-modified Al₂O₃ for 500℃ reaction temperature. The k value of catalysts shows the order of Ce(20)/Al₂O₃ = Ce(0)/Al₂O₃ < Ce(5)/Al₂O₃ < Ce(10)/Al₂O₃. XRD patterns of Ce(0)/Al₂O₃ were no difference before and after the reaction and showed Al₂O₃ phases. With the increase in Ce loadings, CeO₂, AlF3 of XRD peaks was observed. The results was indicated that Ce modifed Al₂O₃ than un-modifed Al₂O₃ was decreased reaction temperature to 200℃ with same decomposition rate. Also the appropriated cerium sulfate loadings on Al₂O₃ were 5~10 wt%.