지표발파시 주파수 특성에 관한 연구

강추원,고진석,이형주 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.1

One of the most troublesome and controversial issues facing the construction is that of ground vibrations, fly rock and air blasts produced from blasting Particularly, ground vibrations bring on directly or indirectly many damages On this study, data of vibration was collected in rock blasting then analyzied data and frequency characterizations of blasting vibration was studied The results can be summarized as follow 1 the formular of square and cube root scaled distance which have a confidence level at the point of 95% are as follows V = 6159.564(D/W^(1/2))^(-1 824) V = 11368.677(D/W^(1/3))^(-1 846), respectively 2 It was found that is proper to get principal frequency by Fast Fourier Transform among two methods 3. This study suggests that new allowable values of vibration according to frequency Namely, If principal frequency is more than 20㎐, then allowable values of vibration should be 0 5㎝/sec and less than 20㎐, then allowable values of vibration should be 0 3㎝/sec.

계측위치와 자유면 방향에 따른 지반진동 특성 연구

강추원,양해승,이수연 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

The free face is an important part in the blasting design and plan. Most of study on the free face is referred to concern with fragmentation volume and determination of charge per delay. But the characteristic of vibration for the direction of the free face short of studies. This study shows the difference and characteristics of the vibration velocity for the measuring point and the direction of the free face. At the velocity of vibration, the back of the free face is over the front (Probably 1.20~1.29 times). A nomogram was made in relation to the maximum charge weight per delay on the basis of the 95% vibration blast equation and the velocity of vibration allowance set 5㎜/sec. Scaled distance was 29.71㎏/m^(1/2), 39.63㎏/m^(1/3) on the front of the free face and 34.03㎏/m^(1/2), 45.20m/㎏^(1/3) on the back of the free face.

혈액투석 환자의 가족지지, 무력감과 자가간호와의 관계 연구

이강오,이미숙,백영주 朝鮮大學校 附設 醫學硏究所 1996 The Medical Journal of Chosun University Vol.21 No.1

This study was designed to investigate the correlations between family support, Powerlessness. and self-care of hemodialysis patients. One hundred thirty seven hemodialysis patients with chronic renal failure from 2 university hospitals, 2 general hospitals, and 2 medical cilinics in Kwang-ju. were accidental sampled. The data were collected from September 16 to 30, 1995. by the questionnaire method. The instrment used for measuring family support was Kang's Family Support Scale, powerlessness was developed by the researcher from the literature review, and self-care was developed by Kim and Youm and was modified by the resecher. The data were analyzed by t-test, ANOVA, and Peatson's correlation coefficient. The results of the study were as follows: 1. Average family support score of subjects was 33.71. 2. Average powerlessness score of subjects was 70.03. 3. Average seof-care score of subjects was 63.28. 4. Relatinoships between general characteristics and variables were as follows 1) There was sighificant difference between family income and family support(F=6.90.p=.000). 2) Three were significant difference betweem present family income and family support(F=6.90, p=.000), 3) There was significant difference between medical insurance and self-care (t= 2.52, p=.013). 5. Correltions betweem family support, powerlessness, and self-care were as follows 1) The first hypothesis, "the higher the level of family support in patients on hemodialysis, the lower the level of powerlessness will be," was supported(r=-.233. p=.022). 2) the second hypothesis, "the higher the level of family support in patients on hemodialysis, the higher the level of self-cate will be." was supported(r=.235, p=.019). 3) The third hypothesis, "the lower the level of powerlessness in patients on hemodialysis, the higher the level of self-cate will be," was not supported(r=-.033. p=.740).

정신과 환자가족의 스트레스와 대처방법과의 상관관계 연구

이강오,김은하,백영주 朝鮮大學校 附設 醫學硏究所 1991 The Medical Journal of Chosun University Vol.16 No.2

This study was attempted to analyze the correlation between stress and coping method of the families of psychiatric patients. The subjects of this were 134 family members selected from psychiatric wards at 2 University Hospitals and 1 Psychiatric Clinic in Kwangju, and National Psychiatric Hospital in Naju Gun. Data was collected from July 18 to August 31, 1990, by the questionaire method. The instruments used the Stresds Rating Scale developed by the researcher and the Coping Scale by Jalowiec and Powers. The data were analyzed by t-test, ANOVA and Pearson's Correlation Coefficient. The results of the study were as follows; 1. Average total stress score of subject was 100.99. Stress factors were classified into seven, and their order of getting score was; information(3.28), family prob1ems(3.20), treatment and nursing care(3.15), financial problems (3.10), Patient's illness(2.97), interpersonal relationship and communication (2.97), and unfamiliarity surroundings(2.74). 2. Average total coping score of Subject was 98.84. Subject rated problem oriented coping methods (3.20), significantly higher in degree of use than affective oriented coping method(2.52). 3. The relationship between stress score and coping score was significantly positive correlation (r=. 3024, P=.000).

完全高密度化된 液相燒結試片의 液相吸入現象에 미치는 固相粒子크기의 영향

權五鍾,李周翰,姜大甲 慶北大學校 1984 論文集 Vol.38 No.-

The effect of Co grain size on the liquid absorption of completely densified Co-Cu compacts by liquid phase sintering is investigated. The compacts of which composition is 80 wt. % Co-20 wt. % Cu, were prepared by ordinary powder metallurgy techniques. To eliminate pores completely and to vary the average size of solid Co grains, the compacts were sintered at 1250℃ for from 1.5-up to 32 hours. A small pellet of 11 wt. % Co-89 wt. % Cu was put into a small hole drilled at the specimen surface. Then the assembly was annealed at the same temperature for from one up to 17 hours. The pellet melted immediately and formed a liquid pool. The presintered body absorbed liquid from the pool. The smaller the solid grain size, the more liquid was absorbed. The amount of the absorbed liquid also increased with the increase of annealing time. The driving force of liquid absorption is expected to be the tendency of anhedral solid grains to restore spherical shape, of which interfacial free energy is lower.

Biochemical Rather than Virologic Response to Interferon Therapy may be More Closely Associated with Decrease of Hepatocellular Carcinoma Incidence in Patients with Chronic Hepatitis B

( Dan Bi Lee ),( Young Hwa Chung ),( Sae Hwan Lee ),( Yoon Seon Lee ),( Don Lee ),( Jeong Eun Hwang ),( Kang Mo Kim ),( Young Suk Lim ),( Han Chu Lee ),( Eun Sil Yu ),( Young Sang Lee ),( Dong Jin Suh 대한소화기학회 2007 Gut and Liver Vol.1 No.1

Background/Aims: The authors examined whether the response to interferon (IFN) therapy can affect the development of hepatocellular carcinoma (HCC) in chronic hepatitis B (CHB) patients. Methods: Out of 353 biopsy-proven CHB patients, 229 (65%) were treated with IFN-α for 6 to 12 months. They were followed for a median period of 75 months (range, 6-120). In patients treated with IFN, biochemical and virologic responses were evaluated at the end of treatment (EOT). The cumulative incidence rates of HCC were calculated and analyzed in relation to baseline characteristics as well as biochemical and virologic responses to IFN therapy. Results: The overall cumulative incidence of HCC was 0%, 0.8%, 3.7% and 5.5% at 3, 5, 7 and 8 years, respectively. Age, serum AFP levels and the stage of fibrosis were significantly associated with the occurrence of HCC. As a whole, IFN therapy did not affect the occurrence of HCC. Among the patients treated with IFN, biochemical responders had low HCC incidence rates compared with non-responders (p=0.018). However, the HCC incidence rates of virologic responders were not different from non-responders (p=0.203). Conclusions: Biochemical rather than virologic response to IFN therapy may be more closely associated with decrease of HCC incidence in CHB patients. (Gut and Liver 2007;1:49-55)

Estimation of the healthy upper limits for serum alanine aminotransferase in Asian populations with normal liver histology

Lee, Jae Keun,Shim, Ju Hyun,Lee, Han Chu,Lee, Sae Hwan,Kim, Kang Mo,Lim, Young‐,Suk,Chung, Young‐,Hwa,Lee, Yung Sang,Suh, Dong Jin Wiley Subscription Services, Inc., A Wiley Company 2010 Hepatology Vol.51 No.5

<P><B>Abstract</B></P><P>A recent study in young Italian subjects suggested that the healthy thresholds for serum alanine aminotransferase (ALT) levels should be adjusted to 30 IU/L for men and 19 IU/L for women when assessing risk factors for nonalcoholic fatty liver disease. Our aim was to assess serum ALT concentrations in healthy Korean individuals and to determine the factors affecting ALT levels in these populations. We included 1,105 potential liver donors (643 men and 462 women) with biopsy‐proven normal livers. Median ages were 25 years in men and 30 years in women, with a median body mass index (BMI) of 22.3 kg/m<SUP>2</SUP> in men and 21.4 kg/m<SUP>2</SUP> in women. The calculated thresholds for ALT values in these subjects were 35 IU/L for men and 26 IU/L for women. Age and BMI were independently correlated with ALT levels in both sexes, whereas serum total cholesterol concentration was significant only in men and blood glucose level only in women (<I>P</I> < 0.05). When we chose a subgroup of 665 individuals (346 men and 319 women) using Prati criteria, modified by the BMI cutoff points for Asians (<23 kg/m<SUP>2</SUP>), we found that the healthy ALT values were 33 IU/L for men and 25 IU/L for women. The mean ALT concentrations for subjects within the Prati criteria were significantly lower than for those outside the criteria (16.7 versus 19.5 IU/L for men, 12.8 versus 14.9 IU/L for women; <I>P</I> < 0.001). <I>Conclusion:</I> The healthy ALT thresholds in biopsy‐proven normal Asians were clearly lower than the previously accepted thresholds, as has also been noted in Europeans. Age, BMI, and/or other metabolic parameters significantly affect ALT levels, even in subjects with normal livers. (H<SMALL>EPATOLOGY</SMALL> 2010.)</P>

Comparison between CFD Analysis and Experiments According to Various PEMFC Flow-field Designs

Lee, Kang-In,Lee, Se-Won,Park, Min-Soo,Cho, Yong-Hun,Cho, Yoon-Hwan,Chu, Chong-Nam,Sung, Yung-Eun The Korean Electrochemical Society 2009 한국전기화학회지 Vol.12 No.1

Flow-field design has much influence over the performance of proton exchange membrane fuel cell (PEMFC) because it affects the pressure magnitude and distribution of the reactant gases. To obtain the pressure magnitude and distribution of reactant gases in five kinds of flow-field designs, computational fluid dynamics (CFD) analysis was performed. After the CFD analysis, a single cell test was carried out to obtain the performance values. As expected, the pressure differences due to different flow-field configurations were related to the PEMFC performance because the actual performance results showed the same tendency as the results of the CFD analysis. A large pressure drop resulted in high PEMFC performance. The single serpentine configuration gave the highest performance because of the high pressure difference magnitudes of the inlet/outlet. On the other hand, the parallel flow-field configuration gave the lowest performance because the pressure difference between inlet and outlet was the lowest.

Effect of home-based exercise intervention on fasting insulin and Adipocytokines in colorectal cancer survivors: a randomized controlled trial

Lee, M.K.,Kim, J.Y.,Kim, D.I.,Kang, D.W.,Park, J.h.,Ahn, K.Y.,In Yang, H.,Lee, D.H.,Roh, Y.H.,Lee, J.W.,Chu, S.H.,Meyerhardt, J.A.,Jones, L.W.,Kim, N.K.,Jeon, J.Y. W.B.Saunders [etc.] 2017 clinical and experimental Vol.76 No.-

<P>Background and Aims. Elevated circulating insulin is associated with increased risk of recurrence and cancer mortality in early-stage colorectal cancer (CRC). We conducted a randomized controlled trial to determine the effect of a 12-week home-based exercise program on fasting insulin, adipocytokines, and physical function in CRC survivors. Methods. One hundred and twenty-three stage II-III CRC patients were randomly assigned to either a home-based exercise (n = 62) or standard care control group (n = 61) for 12 weeks. Home-based exercise consisted of aerobic and resistance training, with a goal of obtaining >= 18 metabolic equivalent task (MET)-h/wk. Participants in the exercise group were instructed to participate in > 18 MET-h/wk. of aerobic and resistance exercise while the participants in the control group were asked to maintain their usual daily activity. The primary outcome was fasting insulin levels. Secondary outcomes were adiponectin, TNT-alpha levels and 6 min walk distance from baseline to post-intervention. Results. After the 12-weeks, moderate-vigorous physical activity participation increased from 9.1 +/- 14.7 MET-h/wk. to 26.6 +/- 21.7 MET-h/wk. in the exercise group, with no change in the control group (p < 0.01 for group and time interaction). Circulating insulin level decreased by 1 mu U/ml (6.0 +/- 3.9 vs. 5.0 +/- 3.5, p = 0.009) in the exercise group with no change in the control group (p = 0.022 for group and time interaction). A similar trend was observed in TNF-alpha (p = 0.030 for group and time interaction). Six minute walk distance increased by 25.2 m in the exercise group with no change in the control group (p = 0.061 for group and time interaction). Conclusions. The 12 week home-based exercise program increased level of physical activity and decreased circulating insulin levels in CRC survivors. (C) 2017 Elsevier Inc. All rights reserved.</P>

Electroacupuncture for migraine protocol for a systematic review of controlled trials

Chu, Hongmin,Seo, Jihye,Kim, Cheolhyun,Moon, Yeonju,Kang, Dae Gill,Lee, Ho Sub,Sung, Kang-Keyng,Lee, Sangkwan Williams & Wilkins Co 2018 Medicine Vol.97 No.17

<P><B>Abstract</B></P><P><B>Background and Objective:</B></P><P>A migraine is one of the primary headache disorders. Acupuncture has been widely used to treat migraine. Furthermore, electroacupuncture (EA) treatment has been also used to treat migraine. However, there has been no systematic review by assessing efficacy and safety of EA on migraine. This protocol is developed to conduct a systematic review and meta-analysis to evaluate the evidences related to the effectiveness and safety of EA on migraine.</P><P><B>Methods and analysis:</B></P><P>This protocol follows the guideline according to the Preferred Reporting Items for Systematic reviews and Meta-Analysis Protocol and registered on the International Prospective Register of Systematic Reviews (PROSPERO). The following seven databases will be searched from their inception to September 2016: Medline, the Cochrane Central Register of Controlled Trials (CENTRAL), EMBASE, OASIS, the Korean Traditional Knowledge Portal, the Korean Medical Database and the China National Knowledge Infrastructure (CNKI). This Systemic review will include only the randomized controlled clinical trials (RCTs) of acupuncture therapy on migraine. We will perform data extraction, study selection, assessment with risk of bias and data analysis. The primary outcomes of this study are headache pain intensity and the total treatment effective rate. And this protocol study for systematic reviews, the approval of IRB was not required.</P><P><B>Ethics and dissemination:</B></P><P>This systematic review will not need ethical approval, because it doesn’t involve human beings. We will publish this systematic review electronically in a peer-reviewed journal. This systematic review will give healthcare practitioners good practical guide and information for treating migraine.</P><P><B>Systematic review registration:</B></P><P>PROSPEROCRD42018085099</P>