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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,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)
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.
호기성 입상화 슬러지를 이용한 SBR 운전의 동력학적 해석 및 설계분석
최성우(Seong Woo Choi) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.4
고분자 응집제를 이용하여 짧은 시간에 형성된 입상형태의 슬러지를 연속회분식 장치에 주입하여 미생물의 호기성 입상화의 특성을 향상시키고, 제조한 입상화 슬러지를 하수에 적용하여 유기물제거에 대한 운전인자를 도출하였다. 유입하수 COD 63~72 mg/L에 대한 유기물 제거속도 계수 k는 10.161 d-1로 일반적 활성슬러지 공법의 k값 5~8 d-1보다 효과적으로 나타났으며, 산소이용에 대한 a`, b` 값은 각각 0.87 mg O₂/mg CODr, 0.11 mg O₂/mg MLVSS·d이었다. 슬러지 합성계수와 자산화계수는 각각 0.45 mg VSS/mg CODr과 0.05 mg VSS/mg MLVSS·d로 일반적 활성슬러지 공법에 비해, 자산화 계수는 비교적 적은 값으로 나타나므로 미생물의 사멸율은 낮은 것을 알 수 있었다. In the present work, the aerobic particle`s characteristics were enhanced. A polymer was used to make aerobic granular sludge in short period of time. And operation parameters were calculated for organic matter removal in domestic wastewater using a sequencing batch reactor (SBR). The experiment for sewage (Influent concentration of 63~72 mg COD/L) by using mature aerobic granular sludge showed the organic matter removal rate k and oxygen utilization coefficient a`, b` were 10.161 d-1 and 0.87 mg O₂/mg CODr, 0.11 mg O₂/mg MLVSS·d respectively. Therefore, it was more effective than K value 5~8 d-1 of conventional activated sludge process. The sludge synthetic value and sludge auto-oxydation value were 0.45 mg VSS/mg CODr and 0.05 mg VSS/mg MLVSS·d respectively. Consequently, mortality rates of microorganisms was lower than conventional activated sludge process.
가스텅스텐 아크용접용 타이타늄합금 플럭스-메탈 코어드 와이어 제조기술
최성우(Seong-Woo Choi),홍재근(JaeKeun Hong),박찬희(Chan Hee Park),이상원(Sangwon Lee),강남현(Namhyun Kang),최윤석(Yoon Suk Choi),박지태(Ji Tae Park),안순태(Soon Tae Ahn),염종택(Jong-Taek Yeom) 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.3
At present, flux or metal cored wires are widely used in iron-based materials for flux cored arc welding in order to reduce the cost of welding production. However, the development of flux or metal cored wire for titanium materials, which are widely used in the petrochemical, power plant and marine vessel fields, has not been done yet, and development is required. In this study, manufacturing process of titanium alloys flux-metal cored wire for gas tungsten arc welding was investigated by FEM simulation and experimental analysis. FEM simulation of tube welding process was carried out with initial three preform-types (butt tube, overlap tube and welded tube). In the FEM simulation results, tube welding process using initial welded tube was evaluated to cause cracking of the specimen during the process. In actual making process of titanium alloys flux-metal cored wire for gas tungsten arc welding, overlap-type tube was evaluated to be the most suitable initial preform shape. In addition, it was confirmed that the filling ratio of the flux-metal was maintained uniformly at over 70%.
재투입이 존재하는 2단계 흐름공정에서 총 작업 흐름시간을 최소화하는 분지한계방법
최성우(Choi Seong-Woo),심상오(Shim Sang-Oh) 한국산업경영시스템학회 2010 한국산업경영시스템학회지 Vol.33 No.4
In this paper, we consider a two-machine re-entrant permutation flowshop scheduling problem with the objective of minimizing total flowtime, and suggest branch and bound algorithms for the scheduling problem. In this scheduling problem, each job must be processed twice on each machine, that is, each job should be processed on the two machines in the order of machine 1, machine 2 and then machine 1 and machine 2. In this research, based on the results of existing researches for re-entrant permutation flowshop scheduling problems, various dominance properties, lower bound and heuristic algorithm are suggested for the problem, and those are used to develop branch and bound algorithms. In the computational experiments for evaluation of the performance of the algorithms, the suggested branch and bound algorithms are tested on randomly generated test problems and results are reported.
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.