자동차 공조용 핀형 열교환기의 성능특성에 관한 연구

홍경한,전상신,이승재,박찬수,권일욱,김재열,김병철,하옥남 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.4

Fin-tube type(Fin-type) heat exchanger has been tested in order to replace the heat exchanger of parallel flow type(P.F-type) which is now widly used in automobile air conditioning system. The following conclusions are drawn by the comparison of the characteristics of the heat exchangers. Evaporator and condenser capacities and COP(Coefficience of performance) were varied as with the compressor speed, outdoor air temperature and air flow rate changed, which much influenced on the characteristics of the air conditioning system. Evaporator and condenser capacities were increased with increasing compressor speed and outdoor air temperature. Evaporator and condenser pressures of Fin- type were decreased by 7% and 5% respectively compared with those of P.F-type. The COP of Fin-type was decreased with increasing outdoor air temperature and compressor speed. The COP of P.F-type was decreased by 14% compared with that of Fin-type.

저항을 이용한 프로판-공기 혼합가스의 점화한계 개선에 관한 연구

이춘하,오종용,옥경재,지승욱,이광식,심광렬 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1

본 논문은 IEC형 불꽃점화 시험장치를 이용하여 저압 유도회로의 최소 점화한계를 프로판-공기 5.25 Vol.%의 혼합 가스에 대하여 실험적으로 구하였으며, 또한 유도회로의 인덕턴스 L에 안전소자로서 저항을 병렬접속하였을 경우 프로판-공기 5.25 Vol.%의 혼합 가스에 대한 점화한계 개선효과를 관찰하였다. 그 결과, 최소 점화한계는 전류의 크기에 따라 좌우되었다 또한, 전원으로부터 공급되는 에너지는 인덕턴스에 우선 축적되고. 그 초과분의 에너지가 폭발성 가스의 점화원으로 작용하였다. 점화한계 개선효과는 인덕턴스가 300 mH일 때, 최고 330%의 개선효과가 나타났으며 인덕턴스가 클수록 점화한계 개선효과가 크게 나타났다. 또한 병렬로 접속한 저항의 크기가 적을수록 점화한계 개선 효과가 크다. 본 연구결과는 본질안전 방폭형 전기기기의 연구개발을 위한 기본자료로 활용할 수 있을 뿐만 아니라 이들 기기의 방폭성능에 대한 시험자료로도 활용이 가능할 것으로 사료된다. This paper describes the minimum ignition limits for propane-air 5.25 Vol.% mixture gases in low voltage inductive circiuts. The improved effects on the ignition limit are studied by parallel safety components(resistors) for propane-air 5.25 Vol.% mixture gas in low voltage inductive circuits. The experimental devices used in this test are the IEC type spark ignition test apparatus. The minimum ignition limits are controlled by the values of current in inductive circuit. Energy supplied from elect source is first accumulated at the inductance, it's extra energy is working as ignition source of the explosive gas. The improved effects on the ignition limit are respectively obtained as the maximum rising rate of 330% by composing parallel circuits between inductance and resistor as compared with disconnecting inductance with the safety components. The more values of inductance increase the higher improved effects of ignition limit rise. The less values of resistor the higher improved effects of ignition limit rise. It is considered that the result can be used for not only data for researches and development of intrinsically safe explosion-proof machines which are applied equipment and detectors used in dangerous areas but also for datum for its equipment tests.

경사진 트레드밀에서 후방보행운동을 통한 넙다리네갈래근 강화와 요통의 관계

박주완,김경,김형욱,김재우,배솔희,서정표,이정구,정하영 대구대학교 특수교육재활과학연구소 2010 再活科學硏究 Vol.28 No.1

목적: 본 연구에서는 경사진 트레드밀에서의 후방 보행 훈련을 통한 넙다리네갈래근의 강화가 요통 환자의 치료에 미치는 영향을 알아보고자 하였다. 대상: 만성 요통을 호소하는 16명의 환자를 대상으로 연구를 실시 하였다. 방법: 트레드밀을 10° 경사로 맞춰놓은 상태에서 대상자들은 하루 20분, 일주일에 3회의 빈도로 2주 동안 훈련을 하였다. 표면 근전도를 가지고 넓다리 곧은근, 안쪽 넓은근, 가쪽 넓은근, 척추 세움근의 %MVIC를 측정하였고, KODI와 VAS를 통해 대상자들의 통증정도를 측정하였다. 결과: 넓다리 곧은근은 훈련전에 비해 훈련을 하고 난 후 상대적으로 높은 근전도를 보였고, 통계적으로 유의하였다(p<.05). 안쪽 넓은근과 가쪽 넓은근 또한 높은 근전도율을 보였지만 통계적으로 유의하지는 않았다. 척추 세움근은 훈련전에 비해 훈련을 하고 난 후 높은 근전도율을 보여주었고, 통계적으로 유의하였다(p<.05). VAS와 KODI의 평균값은 명백하게 감소되었고, 통계적으로 유의하였다(p<.05). 결론: 이상의 결론을 종합하면, 후방보행을 통한 넙다리네갈래근의 강화는 요통의 감소에 효과적이라고 사료되며, 더불어 넙다리네갈래근으로 접근하여 요통을 경감하는 중재방법이 효과적인 치료 방법이 될 수 있다는 것을 의미한다. Purpose: This study was to investigate the influence of strengthening the Quadriceps femoris through backward walking treadmill training in the patients who have lower back pain. Subjects: Sixteen subjects with chronic lower back pain were included. Method: In the training, the treadmill was set to have a inclination of 10 degrees, and the subjects were trained for 20 minutes a day, 3 times a week, for 2 weeks. %MVIC(muscle power) of rectus femoris, vastus medialis oblique, vastus lateralis and erctor spinae were measured with surface EMG, and KODI and VAS were used to measure the subject's level of pain. Results: Quadriceps femoris showed relatively higher average electromyogram rates than that before training(p<.05). Vastus medialis oblique and vastus lateralis also showed higher average electromyogram rates, but no significant change in them was noted. Erector spinae showed higher average electromyogram rates than that before training(p<.05). The average points of VAS and KODI clearly decreased(p<.05). Conclusion: Strengthening Quadriceps femoris seems to be efficient for relieving lower back pain in this study.

경북 최초의 신장이식 1례

이중현,김용섭,이정호,이창우,김상욱,이문섭,오민구,하달봉,이경섭 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

신장이식은 환자의 삶의 질을 높이고 거의 정상적인 사회생활을 가능하게 함으로써 말기신부전 환자의 3가지 신대체 요법(혈액투석, 복막투석, 신장이식) 중에 가장 효과적이고 각광받는 치료법이라 할 수 있다. 최근 들어 의료기술과 의학의 발달로 신장이식의 성공률은 과거에 비해 비약적으로 높아지고 있으며 국내에서도 점차 신장이식수술을 받는 환자가 증가하고 있으나 서울이나 다른 대도시에 비해 의료환경이 열악한 중소도시나 지방의 병원에서는 아직도 시행하지 못하고 있는 형편이다. 이에 저자들은 경북 최초로 자체 의료진에 의해 고혈압과 말기 신부전으로 동국대 포항병원에서 혈액투석을 받고 있던 32세의 남자환자에게 부인으로부터 신장을 제공받아 신장이식을 성공적으로 시행하였기에 문헌고찰과 함께 보고하고자 한다. Kidney transplantation is the preferred treatment modality for many patients with end-stage renal disease (ESRD), because it offers improved quality of life over both hemodialysis and peritoneal dialysis. Patients who do well after transplantation generally report improvement in vitality and freedom to return to the style of life that they experienced before their progression to ESRD. Recently, the success rate of kidney transplantation is greatly being increased as the surgical technique and immunosuppressive drugs are developed. Kidney transplantation is also popular in Korea which has good result. But, until now the general hospitals which are located at small city can't try the kidney transplantation because they don't have proper facilities and experts. We firstly experienced a case of kidney transplantation in a 32 years old man with hypertension and chronic renal failure at KyoungBuk province. So we report this case with references.

The Influence of Size of Solid Lipid Particles upon Pharmacokinetic Behavior of Genistein

CHOI Young Wook,HA Kyoung Wook,KANG Kyoung Hoon,KANG Myung Joo,IM Tae jong,KIM Yong Min,PARK Young Mi,KWON Suk Hyung,LEE Jaehwi 대한약학회 2006 大韓藥學會 總會 및 學術大會 Vol.2006 No.2

Effects of the Work Ethic in Private SECURITY Guards on Job Attitude and Job Immersion Are Investigated

Ha Kyoung-wook,Ka Kyung-whan,Kim Jeong-ha J-INSTITUTE 2016 Public Value Vol.1 No.2

In most cases, private security companies are operated by large companies in South Korea, which leads to competition among small companies rather than the private security companies of large companies. And it is true that a vicious circle has been repeated in which inefficient work system and high turnover due to the mini-mum-level wage, limited opportunities for promotion, and insufficient education & training result in the lack of expertise in most private security guards. As a result, the importance of private security guards vocational ethics as well as their expertise is perceived more than ever. This study investigated the effects of private security guards vocational ethics on their job attitudes and job involvement. A questionnaire survey using the self-administration method was carried out, with private security guards belonging to private security companies in Daegu and Gyeongsangbuk-do as the subjects. And data from a total of 221 subjects were used in the final analysis, using cluster sampling among non-probability sampling. As for the data analysis of this study, frequency analysis, factor analysis, reliability analysis,, cross tabulation analysis, t-test, F-test, correlation analysis, and multiple linear regression analysis were carried out, using the SPSS WIN 18.0 program. As a result, the following findings were derived. First, in terms of socio-demographic characteristics of the private security guards, the subjects showed differ-ences in vocational ethics according to marital status and turnover intention; showed differences in morality according to income and business area; and showed differences in diligence according to turnover experience. They showed differences in job attitude according income and turnover experience; and showed differences in job satisfaction according to income. They showed differences in identification according to income, continuous service year, and turnover experience; showed differences in organizational commitment according to income and turnover experience; and showed differences in work attitude according to turnover experience. They showed differences in job involvement according to income and turnover experience; showed differences in iden-tity according to income and turnover experience; and showed statistically significant differences in conscious-ness of participation according to income and turnover experience. Second, it was found that there were high positive (+) correlations among private security guard s vocational ethics,, job attitude and job involvement. Vocational ethics showed a high correlation with job attitude, and job attitude and job involvement showed a high correlation with each other. Third, it was found that private security guard s morality and diligence had significant effects on job satisfac-tion, identification, organizational commitment, and work attitude. And morality and diligence were found to have significant effects on consciousness of participation and identity. Fourth, it was found that private security guard s job satisfaction, identification, organizational commitment, and work attitude had significant effects on job involvement, and that work attitude, job satisfaction, and organ-izational commitment had significant effects on consciousness of participation.

Comparison of the effectiveness of sirolimus- and paclitaxel-eluting stents for small coronary artery lesions

Park, Kyoung-Ha,Park, Seong-Wook,Hong, Myeong-Ki,Kim, Young-Hak,Lee, Bong-Ki,Park, Duk-Woo,Choi, Bong-Ryong,Kim, Mi-Jeong,Park, Kyoung-Min,Lee, Cheol Whan,Cheong, Sang-Sig,Kim, Jae-Joong,Park, Seung-J WILEY-LISS 2006 Catheterization and Cardiovascular Interventions Vol. No.

<P>Background: The sirolimus-eluting stent (SES) and the paclitaxel-eluting stent (PES) reduce restenosis in small coronary artery lesions. However, it is not clear which of these stents is superior in terms of clinical outcomes. Methods: The authors retrospectively examined 197 patients with 245 de novo small coronary artery lesions (≤≤2.75 mm) that were treated with either the SES (156 lesions) or the PES (89 lesions). Six-month angiographic restenosis rates and the 9-month target lesion revascularization (TLR) rates were compared between the two groups. Results: In terms of baseline clinical and angiographic parameters, the two groups well matched together. Six-month angiographic follow-up was performed on 170 patients (86.3%), comprising 135 SES lesions (86.5%) and 76 PES lesions (85.4%). At 6-month angiographic follow-up, the late lumen loss was less in the SES group than in the PES group (0.29 ± 0.42 vs. 0.69 ± 0.63 mm, P < 0.01). Therefore, the SES group showed a lower rate of angiographic restenosis than the PES group (6.7% vs. 27.7%, P < 0.01). At 9 months there were no deaths or myocardial infarctions in either group. The 9-month TLR rate was lower in the SES group than in the PES group (3.3% vs. 14.4%, P < 0.01). The Kaplan-Meier estimate of freedom from TLR at 9 months was 96.7% for the SES patients and 86.5% for the PES patients (P < 0.01). Conclusions: The SES treatment may be superior to the PES treatment in terms of long-term clinical and angiographic outcomes in patients with small coronary artery lesions. © 2006 Wiley-Liss, Inc.</P>

A Case of Dapsone Hypersensitivity Syndrome Mimicking Infectious Mononucleosis

Young Kim · Ha Lim Cho · Yong Wook Kim · Kyoung Sim Kim · Eun Young Kim · Eun Jung You · Ju Hee You · Hyoung Min Cho 조선대학교 의학연구원 2011 The Medical Journal of Chosun University Vol.36 No.4

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Molecular Mimicry-Based Repositioning of Nutlin-3 to Anti-Apoptotic Bcl-2 Family Proteins

Ha, Ji-Hyang,Won, Eun-Young,Shin, Jae-Sun,Jang, Mi,Ryu, Kyoung-Seok,Bae, Kwang-Hee,Park, Sung Goo,Park, Byoung Chul,Yoon, Ho Sup,Chi, Seung-Wook American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.5

Development and Validation of the Korean Diabetes Risk Score: A 10-Year National Cohort Study

Ha, Kyoung Hwa,Lee, Yong-ho,Song, Sun Ok,Lee, Jae-woo,Kim, Dong Wook,Cho, Kyung-hee,Kim, Dae Jung Korean Diabetes Association 2018 Diabetes and Metabolism Journal Vol.42 No.5

<P><B>Background</B></P><P>A diabetes risk score in Korean adults was developed and validated.</P><P><B>Methods</B></P><P>This study used the National Health Insurance Service-National Health Screening Cohort (NHIS-HEALS) of 359,349 people without diabetes at baseline to derive an equation for predicting the risk of developing diabetes, using Cox proportional hazards regression models. External validation was conducted using data from the Korean Genome and Epidemiology Study. Calibration and discrimination analyses were performed separately for men and women in the development and validation datasets.</P><P><B>Results</B></P><P>During a median follow-up of 10.8 years, 37,678 cases (event rate=10.4 per 1,000 person-years) of diabetes were identified in the development cohort. The risk score included age, family history of diabetes, alcohol intake (only in men), smoking status, physical activity, use of antihypertensive therapy, use of statin therapy, body mass index, systolic blood pressure, total cholesterol, fasting glucose, and γ glutamyl transferase (only in women). The C-statistics for the models for risk at 10 years were 0.71 (95% confidence interval [CI], 0.70 to 0.73) for the men and 0.76 (95% CI, 0.75 to 0.78) for the women in the development dataset. In the validation dataset, the C-statistics were 0.63 (95% CI, 0.53 to 0.73) for men and 0.66 (95% CI, 0.55 to 0.76) for women.</P><P><B>Conclusion</B></P><P>The Korean Diabetes Risk Score may identify people at high risk of developing diabetes and may be an effective tool for delaying or preventing the onset of condition as risk management strategies involving modifiable risk factors can be recommended to those identified as at high risk.</P>