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청력에 대한 연령과 소음 노출의 영향에 관한 5년간 청력역치 변화
채창호 ( Chang Ho Chae ),김자현 ( Ja Hyun Kim ),손준석 ( Jun Seok Son ) 한국산업보건학회 2015 한국산업보건학회지 Vol.25 No.4
Objectives: This study was carried out to evaluate the effect of noise exposure and aging on changes in hearing threshold level and the relationship between age and noise. Materials: The author selected 274 male shipyard and assembly line workers as the noise exposed group and 582 males not exposed to noise as the general population group. Data were collected from five years of consecutive annual audiometric tests performed from 2008 to 2012. Results: In the general population and noise exposed groups, there was a reverse phenomenon that hearing threshold level for 2009 was lower than that of 2008, which seemed to be due to the learning effect, but from 2010 hearing threshold level increased. In the noise exposed group, the mean hearing threshold level in the left ear was significantly higher than that for right ear. In the general population group, the older was the age, the higher was the hearing threshold level, especially at 4000 Hz. In the general population and noise exposed groups, frequency, age group and noise exposure independently affected hearing threshold level, and there was no relationship between age and noise exposure. Over all frequencies, the change of hearing threshold level was larger in the noise exposed group than in the general population group. In the noise exposed group below thirty years old, the change at 4000 Hz was remarkable. Conclusions: Age and noise exposure seem to affect hearing threshold level independently and contribute to an additive effect on hearing threshold level.
MPEG - 4 비디오에서의 효율적인 적응 인트라 리프래쉬
조창호(Chang-Ho Cho),채병조(Byung-Jo Chae),오승준(Seoung-Jun Oh),정광수(Kwang-Sue Chung) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ
통신 채널을 이용해서 비디오 데이터를 전송할 경우 데이터에 에러가 삽입되게 된다. 이러한 에러의 영향을 최소화하기 위해서 비디오에서는 여러 가지 에러 강인성 도구들을 제공한다. 하지만 영상에 한번 에러가 발생하게 되면 다음 영상에도 영향을 주게 되므로, 에러가 생긴 부분을 인트라(Intra)코딩을 해주어야 다음 영상에 영향을 주지 않게 된다.
일개 제조업 남성근로자에서 신체활동과 우울증상과의 관련성
채창호,박철용,손준석,Chae, Chang Ho,Park, Chulyong,Son, Jun Seok 한국산업보건학회 2017 한국산업보건학회지 Vol.27 No.3
Objectives: This study was conducted to assess the association between level of physical activity and depressive symptoms among Korean male workers. Methods: A self-administered questionnaire was distributed and anthropometric measurements were conducted with 1,379 male workers during a general health check. From this data, we identified the general characteristics, levels of physical activity(IPAQ), and depressive symptoms(CES-D) of the study population. We conducted univariate logistic regression to verify the variables that affect depressive symptoms and multivariate logistic regression to calculate odds ratios. Results: Among the 1,379 male workers, 43.4% were in the insufficiently active group(IPAQ category 1) and 22.8% were in the depressive symptom group($CES-D{\geq}16$). The odds ratio(OR) for depressive symptoms was statistically higher in the insufficiently active group, workers aged over 30, the shift work group, and the unmarried group. Adjusted for those variables, the ORs for depressive symptoms were found to be 1.45(95% CI=1.25-2.11), 1.15(OR=1.15, 95% CI=1.08-1.99) and 1.75(95% CI=1.48-2.02), for the insufficiently active group, workers aged over 30, and the shift work group, respectively. Conclusions: We found physical inactivity, age, marital status, and shift work to be associated with depressive symptoms among male workers. This study supports the suggestion that physical activity can be helpful to reduce depressive symptoms among workers.
부산, 경남 일부 지역 주민들의 생선 섭취량과 혈중 수은 농도의 관련성
김찬우,김영욱,채창호,손준석,김자현,박형욱,강윤식,김장락,홍영습,김대선,정백근,Kim, Chan Woo,Kim, Young Wook,Chae, Chang Ho,Son, Jun Seok,Kim, Ja Hyeon,Park, Hyoung Ouk,Kang, Yune-Sik,Kim, Jang-Rak,Hong, Young Seoub,Kim, Dae-Seon,Jeong 한국농촌의학지역보건학회 2012 농촌의학·지역보건 Vol.39 No.4
Objectives: The objective of this study was to identify the relationship between fish consumption and blood mercury levels in a sample of adult Koreans. Methods: The study subjects were 299 residents of Busan (male: 65, female: 234) and 185 residents of Namhae (male: 69, female: 116), South Korea. Demographic characteristics, current smoking, current drinking, fish consumption per week, past history of amalgam treatment, and residential district were recorded by trained interviewers in June and July, 2009. We considered a portion of fish to be equivalent to 70 gm weight, and calculated amounts of fish consumed per week. Using chi-square tests, t-tests, ANOVA, and multiple linear regression analysis, we estimated the relationships between blood mercury levels and amount of fish consumed per week and other factors. Results: The mean blood mercury level of our subjects was 6.61 ${\mu}g/L$, higher than the criterion defined by the United States Environmental Protection Agency (EPA) (5.8 ${\mu}g/L$). In multiple linear regression analysis, residential district and amount of fish consumed per week were associated with blood mercury levels. However, marital status, current drinking, and gender, and age were not associated with blood mercury levels. Conclusions: In conclusion, we suggest the implementation of systematic and periodic population-based studies to decrease the risks of mercury poisoning among South Koreans who consume fish as a regular part of the diet. 본 연구는 직업적으로 수은에 노출되지 않는 일반 인구 군에서 생선 섭취량과 혈중 수은 농도 사이의 관련성을 파악하기 위하여 수행되었다. 이를 위하여 부산광역시 2개 동과 남해군 3개 마을에 거주하는 사람들 중 본 연구 참여에 동의한 484(남자: 134명, 여자: 350명)명을 최종 연구대상으로 하였다. 설문조사는 2009년 6월 말부터 7월초까지 연구 참여 희망자들을 대상으로 훈련된 조사자가 면접설문조사를 실시하였다. 설문 조사의 주요 내용은 성별, 연령, 학력, 결혼상태, 직업, 현재 흡연 여부, 현재 음주 여부, 일주일간 생선 섭취량, 아말감 치료, 거주지역 등이었다. 단변량 분석에서 성별, 나이, 결혼상태, 현재 음주 여부, 일주일간의 생선 섭취량, 그리고 거주지역이 혈중 수은 농도와 유의한 관련성이 있었다. 혈중 수은 농도를 종속 변수로 한 다중선형회귀분석에서 일주일간의 생선 섭취량, 그리고 거주지역이 혈중 수은 농도와 유의한 관련성이 있었다. 생선 섭취량과 혈중 수은 농도 간에는 통계적으로 유의한 관련성이 있다. 앞으로 혈중 수은 농도와 건강 장애간의 관련성을 비롯한 추가적인 연구를 통하여 생선 섭취와 연관된 수은 노출 기준, 실제적인 생선 내 수은 잔류 기준, 생선 섭취빈도와 생선 섭취량에 관한 여러 가지 권고안들을 마련하기 위한 근거 기반을 마련해야 할 것이다.
류형균,박전우,이건호,전창호,이호준,채현동,Ryu, Hyong-Kyun,Park, Jeon-Woo,Lee, Keon-Ho,Jeon, Chang-Ho,Lee, Ho-Joon,Chae, Hyun-Dong 대한위암학회 2009 대한위암학회지 Vol.9 No.4
목적: 정상인과 위암 환자의 혈중 Pepsinogen (PG)농도를 비교 분석하여 선별검사로서 이용가능성 및 위암의 임상 조직학적 요소와의 상관 관계를 알아보고자 하였다. 대상 및 방법: 2008년 11월부터 2009년 5월까지 대구가톨릭대학병원에서 내시경상 특이소견이 없는 정상인과 위선암 환자의 수술 전 혈중 PG농도를 측정하였다. 위암진단의 선별검사로서의 이용가능성을 알아 보기 위해 receiver operator characteristics (ROC) curves를 이용하여 가장 유용한 검사법을 선별하였고, 위암 조직과의 상관관계를 알아보기 위해 특정 기준치에 따라 임상 조직학적 요소를 비교 분석하였다. 결과:선별검사로서 혈중 PG I/II 비율이 가장 유용하였고, 기준치에 따른 민감도, 특이도는 81.8%, 82%로 나타났다. 임상 조직학적 요소 중 Lauren분류에 따른 종양의 아형(P=0.003), TNM 병기의 T 병기(P=0.001), 및 종양주위의 만성 위축성 위염(P=0.036)을 동반한 위선암이 특정기준치(cut off point)값에 의미 있는 관련을 보였다. 결론: 본 연구는 정상 대조군의 수가 적어 선별검사로서 혈중 PG측정의 유용성을 논하기에는 부족하나, 위암의 선별검사로서 이용 가능성 및 임상 조직학적 요소와 의미 있는 관련을 보여 차후 추가연구가 필요할 것으로 생각한다. Purpose: This study was done to determine the usefulness of serum pepsinogen (PG) levels as a screening method for gastric cancer, and to assess the relationships between serum PG and clinicopathologic factors of gastric adenocarcinoma. Materials and Methods: Serum PG concentrations were measured in 94 subjects who were classified into (a) a control group (50 subjects) without abnormal endoscopic finding on a health checkup, or (b) a gastric cancer group (44 subjects) who had surgery at Daegu Catholic University Hospital between Nov. 2008 and May 2009. Receiver operator characteristic curves were utilized to select the most suitable test. Using different cutoff points, sensitivity and specificity were calculated. We compared preoperative serum PG levels with several clinicopathologic findings for patients with gastric adenocarcinoma. Results: The Serum PG I:II ratio was the most useful as a screening test. The sensitivity and specificity of PG screening for gastric cancer were, respectively, 81.8% and 82%. The cut off point correlated with the type of intestinal cancer (Lauren classification; P=0.003), tumor stage (P=0.001), and gastric adenocarcinoma with peritumoral chronic atrophic gastritis (P=0.036). Conclusion: Serum PG levels were found to be a potentially useful screening test and to correlate with clinicopathologic factors in gastric cancer patients. But, in order to use serum PG found in a health checkup for gastric cancer as a clinical application a large scale study is recommended.