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임종한,윤준규,Lim, Jong-Han,Yoon, Jun-Kyu 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.6
Apparatus of rotating disk and cup are widely used spray paintings and industrial boilers. This study was conducted experimentally to investigate the characteristics of liquid atomization in a rotating disk atomizer by means of viscous liquid mixed water and glycerin. The Purpose of this study are to observe breakup mechanism according to the variation of supplied flow rate $0.4{\sim}30 cm^3/s$ and rotating speed $200{\sim}4000rpm$, and to investigate three kinds of breakup Pattern such as drop ligament and film formation by comparing the transition flow rate. ligament number and ligament length to those of Tanasawa and Matsumoto's empirical formula. The results are as follows ; The higher it makes use of viscous liquid. the better it get the characteristics of breakup mechanism. Also When I compared practical value with experiential value at similar test conditions. it was shown similar tendency though were a little variation.
NATM 터널 라이닝 점검 및 상태평가 스마트 자동화시스템 개발
임종한 ( Lim Jong-han ),민필중 ( Min Pill-jung ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.1
안전점검 분야는 1995년 “시설물의 안전관리에 관한 특별법” 공포 이후 조사방법 및 평가방법 등에 있어 점진적인 기술발전을 이루어 왔으나, 기술자의 현장조사시 습득된 손상정보에 대한 기록 및 시설물 평가 절차가 수작업 위주의 아날로그식 방법으로 수행되고 있어 기록상의 오류가 평가결과의 오류로 연계되고 있으며 안전점검 분야 전체의 신뢰도 저하로 이어지고 있는 것이 안전점검 분야의 현실이다. 이에 현장에서 기술자에 의해 취득된 손상 정보 등을 디지털식 기록을 통하여 직접 전산화 함으로써 현장에서 발생될 수 있는 기록오류를 최소화 하고 디지털화된 손상정보를 활용한 대상 시설물에 대한 상태평가 자동화를 통해 안전점검 분야의 신뢰도 향상과 현장기술자의 고충 해결을 위한 스마트 손상망도 프로그램과 상태 평가 자동화 프로그램의 개발 및 현장 적용 가능성을 검토함.
건강한 남성에서 혈중 감마지티피 수준과 공복혈당장애 (IFG)의 발생 위험도: 2년 추적 연구
신주연,임종한,고대하,권근상,김용규,김환철,이의철,이주형,남문석,홍성빈,박신구,Shin, Joo-Youn,Lim, Jong-Han,Koh, Dai-Ha,Kwon, Keun-Sang,Kim, Yong-Kyu,Kim, Hwan-Chul,Lee, Yeui-Cheol,Lee, Ju-Hyoung,Nam, Moon-Suk,Hong, Sung-Bin,Park, Shin 대한예방의학회 2006 예방의학회지 Vol.39 No.4
Objectives: An increase in the serum gamma-glutamyltransferase (GGT) concentration has been regarded as a marker of alcohol drinking or liver disease. Some reports, however, have suggested that the serum GGT may be a sensitive and early biomarker for the development of prediabetes and diabetes. In this study we investigated whether serum GGT is a reliable predictor of the incident impaired fasting glucose (IFG), including diabetes. Methods: We performed a prospective study for two years (2002-2004). We analyzed the periodic health examination data from a total of 4,711 men. The examinations were done in the years 2002 and 2004. The analyzed data included a self-questionnaire, a physical examination and the laboratory results. Both IFG and diabetes were defined as a serum fasting glucose concentration of more than 100 mg/dL and 126 mg/dL, respectively. Results: A total of 738 cases (15.7%) of incident IFG and 13 cases (0.3%) of diabetes occurred. The mean serum GGT concentrations were quite different between the normal (38.0 IU) and incident IFG groups (50.3 IU), and the incident diabetes group (66.0 IU) (p<0.001). After multivariable adjustment, the relative risks for incident IFG or diabetes across the baseline GGT categories (<10th, 10th-20th, 30th-40th, 50th-60th, 70th-80th and >90th percentile) were 1.0, 1.172 (0.769-1.785), 1.107 (0.725-1.689), 1.444 (0.934-2.232), 2.061 (1.401-3.031) and 2.545 (1.784-3.631) (p-value for trend: <0.001). The risks significantly increased with increasing levels of GGT for 2 years; when comparing the increased groups (<10%, 10-20%, >20%) versus the decreased over 20% group of GGT, the risks for IFG or diabetes were 1.334 (1.002-1.776), 1.613 (1.183-2.199) and 1.399 (1.092-1.794). Conclusions: Our findings suggest that serum GGT concentrations within its normal range may be an early predictor of the development of IFG and diabetes. As serum GGT is a relatively inexpensive test and a reliable marker, it might have important implications in public health promotion.
Soyeoun Lim,임종한,홍영습,김정원,박소영,조준성,권운정,김양호 대한의학회 2020 Journal of Korean medical science Vol.35 No.45
Background: To compare the chest computed tomography (CT) images of children and adults in families with clusters of humidifier disinfectant-related lung injury (HDLI) after cessation of exposure to humidifier disinfectant (HD). Methods: We reviewed medical records of 19 families with 43 patients (21 adults, 22 children) among families, which had at least one adult and one child with HDLI. Each family was exposed to the same HD exposure environment. Results: In adults, centrilobular nodules were predominant (95.2%) in chronic HDLI findings after cessation of exposure to HD, however, in children, normal pattern was most prevalent on chest CT (45.5%), followed by centrilobular nodule (36.4%), bizarre lung cysts (36.4%), and reticulation (13.6%). Conclusion: Unlike the known chronic HDLI finding of adults, centrilobular nodules were only present in 36.4% of children. The frequency of bizarre lung cysts were significantly greater in children than that in adults after cessation of similar exposure to HD. Thus, bizarre lung cysts may be useful as another novel finding of chronic HDLI in children who have no history of pulmonary infection or other perinatal disorder such as hyaline membrane disease or other interstitial lung disease.
신주연,임종한,박신구,이지나,장미,허청송,강대희,홍윤철,Shin, Joo-Youn,Lim, Jong-Han,Park, Sin-Goo,Lee, Jee-Na,Jang, Mi,Huh, Chung-Song,Kang, Dae-Hee,Hong, Yun-Chul 대한예방의학회 2004 예방의학회지 Vol.37 No.3
Objectives : This study was performed to examine the influence of smoking on the blood cadmium concentration in university students. Methods : The study included 300 university students. A questionnaire interview was used to collect data. The urine cotinine and blood cadmium levels were measured as biological exposure indices. The data were analyzed using t-tests ANOVA and ANCOVA. Results : The median value of blood cadmium concentration was equal in both males and females ($0.8{\mu}g/l$). This level was relatively low in comparison with the reference value suggested by WHO (2001). ANCOVA showed that smoking related variables, urine cotinine and smoking amount, were significantly associated with the blood cadmium level (P=0.004, 0.015). However, the values with regard to traffic related air pollution were not significantly associated with the blood cadmium level. Conclusions : Smoking is an important source of nonoccupational cadmium exposure in young people. The Blood cadmium level is at least 10% higher in active smokers than in passive or nonsmokers. The level of urine cotinine can be used as an indicator of non-occupational exposure of respirable cadmium due to smoking, as there is a good correlation bestween smoking amount and the urine cotinine level.
V8형 TCI 디젤기관의 배출가스저감 및 성능개선에 관한 연구
윤준규,임종한,Yoon Jun-Kyu,Lim Jong-Han 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.4
The purpose of this study is experimentally to analyze the effects of intake port swirl, injection system and turbocharger on the engine performance and the emission characteristics in a V8 type turbocharger intercooler D.I. diesel engine of the displacement 16.7L, and to suggest the improvement of engine performance. Generally to enhance engine power, TCI diesel engine is put to practically use turbocharged intercooler in order to increase volume efficiency which is cooled boost air. As results of considering the factors of the intake port of swirl ratio 2.25, compression ratio 17.5. re-entrant $8.5^{\circ}$ combustion bowl, nozzle hole diameter ${\phi}0.33{\ast}3+{\phi}0.35{\ast}2$. nozzle protrusion 3.18mm, injection timing BTDC $12^{\circ}CA$ and turbocharger(compressor 0.6A/R+46Trim. turbine 1.0 A/R+57Trim) is the best in the full load in the engine performance and the exhaust characteristics of NOx concentration. Therefore. their factors are appropriated as intake system, injection and turbocharger system.
호문기,임영욱,임종한,양지연,신동천,Ho Moon-Ki,Lim Young-Wook,Lim Jong-Han,Yang Ji-Yeon,Shin Dong-Chun 환경독성보건학회 2006 환경독성보건학회지 Vol.21 No.3
Although, mercury (Hg) is not a naturally abundant element in the environment, residues frequently occur in many environmental compartments because of widespread contamination from industrial and agricultural practices. This research evaluated Hg-B concentrations of general population who was not occupationally exposed. And also evaluates the association between life factor and health effect with Hg-B concentration of general adult through interrelationship estimation and index about kidney function and oxidative damage that appeared by questionnaire survey and medical examination. Average concentration of Hg-B was 3.19 $\mu$g/L (ND$\sim$8.64 $\mu$g/L), and persons who exceed mercury exposure level (5 $\mu$g/L) presented in WHO (1990) appeared by 16 (7.0%). High-risk group (smoking and meat main intake group) had significantly higher Hg-B concentration than low-risk group (non-smoking and vegetable diet main intake group) (p < 0.05, low-risk group: 3.30 $\mu$g/L (ND$\sim$8.64 $\mu$g/L), high-risk group: 4.27 $\mu$g/L (ND$\sim$7.84 $\mu$g/L).