서울 경기지역 성인의 C형 간염 바이러스 항체 양성자 평균발생률; 후향적 코호트 연구 - 일개 병원의 종합검진 자료를 중심으로 -

류승호,김동일,서병성,김원술,장유수,백승호,이수진,김용규,송재철,Ryu, Seung-Ho,Kim, Dong-Il,Suh, Byung-Seong,Kim, Woon-Sool,Chang, Yoo-Soo,Beck, Sung-Ho,Lee, Soo-Jin,Kim, Yong-Kyu,Song, Jae-Chul 대한예방의학회 2004 예방의학회지 Vol.37 No.4

Objectives : This study was performed to determine the incidence density and the prevalence of sero-positive hepatitis C from 1999 to 2002 among adults aged 20 and over residing in Seoul and the Gyeonggi province. Method : The data for period was obtained from 114,635 adults, residing in Seoul or the Gyeonggi province, who had undertaken comprehensive health screening tests from Jan 1999 to Dec 2002 in a University hospital in Seoul. Among them, subjects with sero-negative status against hepatitis C were selected (21,408 in 1999, 28,830 in 2000) and then followed up until Dec 2002 to determine the incidence of hepatitis C during this period. The serum was tested with the immunoradiometric assay (IRMA) which uses third generation HCV antibody. Age adjusted rates were estimated by direct standardization using a reference population of 2000 aged from 20 to 80 years. Results : The prevalence of anti-HCV from 1999 to 2002 was 2.1 per 1000 persons(95% CI $1.8{\sim}2.4$). Male showed 1.7 per 1000 persons (95% CI $1.4{\sim}2.1$), while female showed 2.7 per 1000 persons(95% CI $2.2{\sim}3.2$). Age?sex adjusted rate showed 2.8 per 1000 persons (95% CI $2.64{\sim}2.96$), which is lower than the results of some previous study. The prevalence showed a significantly increasing pattern with age both in males and females (p<0.05). The incidence density of anti-HCV among the population aged 20 and over was 1.1 per 104 person-years at risk (95% CI $0.6{\sim}2.4$); 1.2 (95% CI $0.6{\sim}2.7$) for males and 0.8 (95% CI $0.6{\sim}4.2$) for females. Age adjusted incidence density was 2.91 per 104 person-years at risk (95% CI $2.43{\sim}3.38$) for those aged 20 and over. It showed an increasing pattern with age (p<0.05), especially for those age over 50 years. Conclusion : The study subjects for this study were supposedly healthier than the general population so the prevalence and incidence for the general population are thought to be higher than the results of the present study.

은도금제품 검사실 여성근로자들의 시력변화 및 안증상

류승호,손정일,이수진,송재철,Ryu, Seung-Ho,Son, Jeong-Il,Lee, Soo-Jin,Song, Jae-Cheol 대한예방의학회 1997 Journal of Preventive Medicine and Public Health Vol.30 No.3

작업장에서 장기간 폭로되는 현휘의 정도에 따른 시력저하 여부를 조사하기 위하여 모전선회사의 불량품을 가려내는 과정 중 빛의 반사정도가 큰 은도금 제품을 검사하는 부서인 lead frame반 여성근로자 13명과 이들의 시력저하정도를 비교하기 위하여 같은 업체에 불량품을 가려내는 과정중 빛의 반사가 적은 플라스틱제품을 최종 검사하는 Connector반 여성근로자 14명, 사무직 여성근로자 12명을 대상으로 조사한 결과를 요약하면 다음과 같다. 1. 입사 전과 비교하여 주관적인 현재의 시력이 변화가 있는 지에 대한 주관적인 평가는 Connector반, 사무직이 각각 81.8%, 85.7%가 나빠졌다고 응답한 반면 L/F반의 경우 대상자 전원(100%)이 나빠졌다고 응답하였다. 입사 전에 시력을 교정하지 않았던 대상자중 입사 후 안경이나 콘택트렌즈로 시력을 교정하게 된 비율은 Connector반의 경우 7명중 1명(14.3%), 사무직의 경우 5명중 2명(40%)인데 비해 L/F반의 경우 10명중 7명(70%)이 입사 후 시력을 교정 받았다. 2. L/F에서 주로 호소하는 증상은 안구피로로 전원이 매일 느끼고 있었고, 눈물이 난다(63.6%). 시력저하(45.5%), 충혈(45.5%), 눈부심(45.5%)의 순으로 호소하였다. 이들 외의 증상은 대체로 부서간의 비슷한 양상을 보였다. 3. 1991년부터 1996년까지 5년간의 원거리시력 자료 중 기준시점에서 부서별 좌측시력의 중앙값은 L/F반, Connector반, 사무직 각각 1.0(0.3-1.5), 1.0(0.4-1.5), 1.0(0.4-1.5), 우측시력의 중앙값은 각각 1.0(0.2-1.5), 0.95(0.3-1.2), 1.0(0.4-1.5)로 부서간의 유의한 차이는 없었다(p>0.05). 4. 5년동안 추적 관찰기간의 좌측 시력 변화는 Connector반, 사무직의 경우 연간 각각 -0.46줄$({\pm}0.70)$, -0.35줄$({\pm}0.36)$의 변화를 보인 반면, L/F반에서 연간 -1.42줄$({\pm}1.45)$의 변화를 보여 통계적으로 유의한 차이를 보였다(p=0.013). 우측시력 역시 Connector반, 사무직에서는 연간 각각 -0.59줄$({\pm}0.67)$, -0.31줄$({\pm}0.55)$의 변화를 보인 반면, L/F반에서 연간 -1.59줄$({\pm}1.10)$이의 변화를 보여 통계적으로 유의한 차이를 보였다(p=0.001). 연구결과, 저자는 장기간의 현휘에 폭로된 근로자들에게 근시를 초래할 수 있을 것이라는 가설을 제시하고, 고휘도 작업환경에 대한 대책마련이 필요할 것으로 생각한다. To evaluate the effects of reflected glare on eyes, authors assessed the periodic health examination(1991-1996) & self-administered questionnaire data of a semiconductor producing company. The 13 lead frame(LF) department workers have been exposed to high reflected glare in the process for examining the silver plating products. We compared the data of connector(14) and clerical(12) workers as the non-exposed ones. Among LF department workers, 100% felt their visual acuity worsened(connector:81.8%, clerical:85.7%), and 70% had worn the glasses o. contact lenses(connector : 14.3%, clerical :40%) since working at the company. Major ophthalmic symptoms of the LF workers are asthenopia, tearing, decreased visual acuity, congestion and glare. Decrease of visual acuity by Hahn's line change of the LF workers is significantly high during a 5-year follow-up(p<0.05 by simple regression) compared with connector clerical workers.

공복혈당장애의 기준 하한치에 관한 코호트연구 - 일개병원 종합건강자료를 중심으로 -

류승호,김동일,서병성,김원술,장유수,Ryu, Seung-Ho,Kim, Dong-Il,Suh, Byung-Seong,Kim, Woon-Sool,Chang, Yoo-Soo 대한예방의학회 2005 예방의학회지 Vol.38 No.2

Objectives: Recently, the American Diabetes Association (ADA) redefined the criteria of prediabetes, which has lowered the diagnostic level of fasting plasma glucose (FPG) from 110 to 125 mg/dl, down to levels between 100 to 125mg/dl. The purpose of this study was to determine the predictive cutoff level of FPG as a risk for the development of diabetes mellitus in Korean men. Methods: A retrospective cohort study was conducted on 11,423 (64.5%) out of 17,696 males $\leq$30 years of age, and who met the FPG of $\leq$125 mg/dl and hemoglobin A1c of $\leq$ 6.4% criteria, without a history of diabetes, and who were enrolled at the screening center of a certain university hospital between January and December 1999. The subjects were followed from January 1999 to December 2002 (mean follow-up duration; 2.3(${\pm}0.7$) years). They were classified as normal (FPG <100mg/dl), high glucose (FPG $\geq$100mg/dl and <110mg/dl) and impaired fasting glucose (FPG $\geq$110mg/dl and $\leq$125mg/dl) on the basis of their fasting plasma glucose level measured in 1999. We compared the incidence of diabetes between the 3 groups by performing Cox proportional hazards model and used receiver operating characteristic analyses of the FPG level, in order to estimate the optimal cut-off values as predictors of incident diabetes. Results: At the baseline, most of the study subjects were in age in their 30s to 40s (mean age, 41.8(${\pm}7.1$) year). The incidence of diabetes mellitus in this study was 1.19 per 1,000 person-years (95% CI=0.68-1.79), which was much lower than the results of a community-based study that was 5.01 per 1,000 person-years. The relative risks of incident diabetes in the high glucose and impaired fasting glucose groups, compared with the normal glucose group, were 10.3 (95% CI=2.58-41.2) and 95.2 (95% CI= 29.3-309.1), respectively. After adjustment for age, body mass index, and log triglyceride, a FPG greater than 100mg/dl remained significant predictors of incident diabetes. Using the receiver operating characteristic (ROC) curve, the optimal cutoff level of FPG as a predictor of incident diabetes was 97.5 mg/dl, with a sensitivity and a specificity of 81.0% and 86.0%, respectively. Conclusion: These results suggest that lowering the criteria of impaired fasting glucose is needed in Korean male adults. Future studies on community-based populations, including women, will be required to determine the optimal cutoff level of FPG as a predictor of incident diabetes.

컨버전스 제품 개발을 위한 기능의 결합 조건에 관한 연구

류승호,Ryu, Seung Ho 한국스마트미디어학회 2013 스마트미디어저널 Vol.2 No.4

본 연구는 컨버전스 제품 개발 과정에 적용 가능한 보편 타당한 3대 결합 조건들로서 이질성, 계획성, 참신성을 제시하고 그 내용을 탐구한다. 이질성은 결합되는 기능들이 모두 서로 달라야 하는 것이다. 계획성은 결합이 제품 개발 과정 속에서 이루어져야 하는 것이며, 도구를 자의적으로 다목적 활용하는 것은 배제된다. 참신성은 결합에 의해 제품의 기능적 가치가 확대되는 것이다. 이질성, 계획성, 참신성은 컨버전스 제품의 기능적 특징과 창조 과정을 대표하는 요소들이다. 이들은 결합의 다양한 응용을 가능하게 하여 컨버전스 제품의 등장 범위를 넓히며, 나아가 사회 문화적 배경의 변화와 컨버전스 제품 사이의 다양한 담론들을 전개한다. 이를 통해 컨버전스란 철저한 계획과 전략 속에서 결합의 대상에 대한 선별작업을 통해 진행되는 제품 개발 방법이라는 것을 알 수 있으며, 이에 본 연구를 통해 향후의 컨버전스 기반 제품 개발 전략이 더욱 활성화되기를 바란다. This study aims to propose three universal appropriate conditions, 'difference', 'planning', and 'freshness' for convergence products, and research their contents. 'Difference' means that combined functions have to be all different. 'Planning' indicates that combining different functions has to be proceeded in product development processes, so multiple usages human beings make in their daily lives have to be excepted. 'Freshness' explains that the values of combined functions are expanded by convergence. They are the elements to represent convergence products' functional characteristics and developing processes. They widen the range of convergence products by making in a number of various combining ways, and develop a lot of discourses based among social cultural backgrounds, concepts, and products. This study has shown that convergence is a product method that is managed by strict plans, strategies, and chosen functions. Convergence is a product development method with chosen functions, strict plans, and development strategies. Now, this study will lay the foundation for future works on product development strategies based on convergence.

복부비만이 제2형 당뇨병 및 공복혈당장애 발생에 미치는 영향: 후향적 코호트 연구

류승호,백승호,김동일,서병성,김원술,성기철,장유수,Ryu, Seung-Ho,Beck, Sung-Ho,Kim, Dong-Il,Suh, Byung-Seong,Kim, Woon-Sool,Sung, Ki-Chul,Chang, Yoo-Soo 대한예방의학회 2004 예방의학회지 Vol.37 No.4

Objectives : This study was performed to determine whether an increase in abdominal obesity is an independent risk factor for impaired fasting glucose and type 2 DM. Methods : Among 24,212 adults over 30 years who undertook comprehensive medical screening examinations from Jan to Dec 1999, in a university hospital in Seoul, a total of 11,183 subjects were selected who had no DM at baseline and who were followed up more than once by Dec 2002. The average follow up period was 2.4 (${\pm}0.5$) years. DM was defined as having a fasting glucose level $\geq$ 126mg/dl, and impaired fasting glucose as showing a fasting glucose level between 110 and 125 mg/dl. Body weight, height and waist circumference (WC) were simultaneously measured with blood sampling. The relative risks (RRs) for DM and impaired fasting glucose by WC were calculated using Cox proportional hazard model. Ageadjusted rates were estimated by direct standardization using a reference population of 2000 from 30 to 80 years. Results : The average age of the subjects was 41.7 (${\pm}7.0$) years; males 41.2 (${\pm}6.5$) and females 45.6 (${\pm}9.2$). RRs for type 2 DM by WC with the reference group of WC < 80cm were as follows: 2.66 (95%, CI $0.55{\sim}12.8$) for WC of $80{\sim}89cm$ in men, 5.92 (95%, CI $1.08{\sim}32.3$) for WC $\geq$ 90 cm in men, and 2.64 (95%, CI $0.23{\sim}29.8$) for WC of $80{\sim}89cm$ in females. RRs for impaired fasting glucose by WC were 3.03 (95%, CI $2.18{\sim}4.22$) for WC $80{\sim}89cm$ in men, 6.10 (95%, CI $4.25{\sim}8.75$) for WC $\geq$ 90cm in men, and 1.56 (95%, CI $0.43{\sim}5.67$) for WC $80{\sim}89cm$ in women, and 8.08 (95%, CI $2.22{\sim}29.4$) for WC $\geq$ 90cm in females. These results remained significant after adjustment for age, BMI and fasting glucose concentrations at baseline in both sexes. Annual increment of more than 1 cm in WC was associated with the development of DM and impaired fasting glucose independently of age, sex, BMI, or presence of abdominal obesity. Conclusion : In Korean adults, abdominal obesity increased the risk for the development of type 2 diabetes and impaired fasting glucose. This result supports many other prospective studies suggesting abdominal obesity as a risk factor for type 2 diabetes.

성공과 실패사례를 통한 Brand-Focused Strategy 연구

류승호(Ryu Seung-Ho),나건(Nah Ken) 한국디자인학회 2004 한국디자인학회 학술발표대회 논문집 Vol.- No.-

은닉 마코프 모델링 기법을 사용한 위치 정보에서 인간 이동 모델 도출

류승호 ( Seung Ho Ryu ),송하윤 ( Ha Yoon Song ),김현욱 ( Hyunuk Kim ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2

GPS장비의 보급으로 인한 위치정보 수집이 용이해짐에 따라서 보다 현실적인 인간의 이동패턴을 구할 수 있게 되었다. 그에 따라 GPS 장비나 스마트폰을 이용하여 일정기간의 위치정보를 수집하였다. 수집된 위치 데이터를 이용하여 자주 방문하는 장소를 기점으로 인간 이동패턴을 은닉 마코프 방법을 이용하여 도출하였다.. 결과적으로 은닉 마코프 모델의 Baum-Welch 알고리즘으로 생성된 모델은 장소간 이동에 대해서는 효과적으로 표현을 하였음을 확인하다.

제품디자인과 모방

류승호(Ryu, Seung Ho) 한국디자인지식학회 2006 디자인지식저널 Vol.2 No.-

탈 모더니즘 제품디자인의 수용을 위한 이해 (1)

류승호(Ryu Seung-Ho),문찬(Moon Charn) 한국디자인학회 2005 한국디자인학회 학술발표대회 논문집 Vol.2005 No.5

복합 운동이 정신분열증 환자의 기초체력 및 우울 증상에 미치는 영향

류승호 ( Seung Ho Ryu ),송봉길 ( Bong Gil Song ),김연수 ( Yeon Soo Kim ),권현진 ( Hyun Jin Kown ) 한국특수체육학회 2015 한국특수체육학회지 Vol.23 No.1

본 연구의 목적은 복합운동 트레이닝이 정신분열증 환자의 기초체력과 우울증상에 미치는 영향을 규명하는데 있다. 연구 대상은 충청북도에 위치한 S정신병원에 입원중인 정신분열증 환자들로 의사의 진단아래 운동 프로그램에 참여하는데 지장이 없는 남성을 모집한 후, 본인과 보호자의 동의를 받은 대상자를 선정하여, 무선 할당으로 운동군(n=14), 비운동군(n=14)으로 나누었다. 운동은 탄성밴드와 걷기를 병행한 복합운동 프로그램으로, 하루 60분, 주 3회, 12주간 실시하였으며, 비운동군은 평소 생활 습관을 유지하도록 하였다. 모든 변인의 측정은 운동 프로그램 전과 후 총 2번에 걸쳐 실시되었으며, 측정항목으로 기초체력은 악력, 각근력, 순발력, 유연성, 심폐지구력을 측정하였고, 우울증상은 벡우울척도(Beck depression inventory)를 이용하여 측정하였다. 12주간의 복합 운동 중재 후, 운동군에서 악력과 각근력에서 유의한 차이가 나타났으며, 우울증상의 변화에 있어서도 유의한 차이를 나타났다. 하지만, 순발력, 유연성, 심폐지구력에서는 유의한 차이가 나타나지 않았다. 본 연구 결과, 탄성밴드와 걷기를 이용한 복합운동 프로그램은 정신분열증 환자의 근력을 향상시키고 우울 증상을 완화 시키는데 긍정적인 효과를 나타내어, 복합 운동 프로그램이 정신분열증 환자에게 적용 가능한 프로그램이라는 것을 검증하였으나, 정신분열증 환자들의 전반적인 체력 향상과 우울 증상의 유의한 개선을 위하여 추후 다양한 신체활동 프로그램에 대한 적용과 적절한 중재가 필요할 것으로 사료된다. The purpose of this study was to investigate the effects of a 12-week combined aerobic and resistance exercise program on physical fitness and depression in patients with schizophrenia. Twenty-eight male patients with schizophrenia were randomly assigned into two groups; combined exercise group (CEG, n=14) and the control group (COG, n=14). The exercise program consisted of group walking and Thera-Band resistance exercises in 60-min sessions, three times a week for a 12-week period. Physical fitness consist of grip, leg strengths, power, flexibility, cardiorespiratory fitness. A secondary condition was self-reported symptoms of depression, assessed with the Beck depression inventory. The significant level was P<0.05. After 12 weeks, the CEG group was significantly in strength (Grip and Leg). Also Beck Depression Inventory was significantly in the CEG group. But, power, flexibility, cardiorespiratory fitness, there were no significant by combine exercise. Therefore, This research shows that strength (Grip and Leg) and depression symptoms of the combined exercise group improved significantly in 12 weeks due to the exercises. Combined exercises should be included in rehabilitation in order to improve physical capacity and depression symptoms.