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조무식,김선주,원혜윤,고정관,이경석 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.2
We report a series of 220 patients with low back pain who visited through neurosurgical out-patient department(OPD) from January 1994 to June 1994. We investigated how they were treated and what was the outcome on December 1995 by telephone interview. During the study period, 176 patients (80%) visited our OPD not more than twice. Frequency of OPD visit was single in 138 patients (62.7%), twice in 38 patients (17.3%), and over twice in 44 patients (20.0%). Twenty six patients (11.8%) were admitted, and 16 patients (7.3%) underwent an operation. Sixteen patients underwent surgery in this hospital, and the other 12 patients underwent surgery in any other hospitals. The rate of revisit was relatively high in patients who had a special study (58.1%), whose impression was herniated lumbar disc (41.2%) or degenerative spondylosis (55.6%), and who received prescriptions for drug (42.1%) or underwent an operation(87.5%). The rate of special study, prescriptions and/or operations of was relatively low in this hospital, which seems to lessen the rate of revisit. More active management seems to be necessary for the patient' satisfaction.
유한 요소법을 이용한 중소하천 유역에서의 이동호우에 대한 유출특성 분석
조현경,이영화,최윤영 한국환경과학회 1998 한국환경과학회지 Vol.7 No.4
In the rainfall-runoff relation, consideration of the spatial movement of storms is very important in designing a hydraulic structure or evaluating an environmental influence for land usage. Because of this reason, this study has suggested the finite element model which consider the spatial movement of a stome and it was applied on a small river basin(Wi stream basin). In the application of the model the basin was treated as a pivot point and the storms are simulated with movement in each directions. As a result, it shows that the storms moving from north to south have bigger peak discharge and faster peak time than the storms moving in other directions. So these characteristics have to be considered in the designation of a hydraulic structure or evaluation of an environmental influence.
Sex Based Analysis of Outcome in Patients with Primary Coronary Intervention
( Yun Kyeong Cho ),( Chang Wook Nam ),( Seung Ho Hur ),( Kwon Bae Kim ),( Min Jung Kim ),( Chang Wook Park ),( Young Soo Lee ),( Sang Hoon Lee ),( Seong Wook Han ),( Kee Sik Kim ),( Yoon Nyun Kim ) 대한내과학회 2004 대한내과학회 추계학술발표논문집 Vol.2004 No.1
( Yun Kyeong Cho ),( Seung Ho Hur ),( Nam Hee Park ),( Sang Woong Choi ),( Ji Hyun Sohn ),( Hyun Ok Cho ),( Hyoung Seob Park ),( Hyuck Jun Yoon ),( Hyung Seop Kim ),( Chang Wook Nam ),( Yoon Nyun Kim 대한내과학회 2014 The Korean Journal of Internal Medicine Vol.29 No.1
Background/Aims: While drug-eluting stents (DESs) have shown favorable out-comes in ST-segment elevation myocardial infarction (STEMI) compared to bare metal stents (BMSs), there are concerns about the risk of stent thrombosis (ST) with DESs. Because intravascular ultrasound (IVUS) guidance may help optimize stent placement and improve outcomes in percutaneous coronary intervention (PCI) patients, we evaluated the impact of IVUS-guided BMS versus DES implan-tation on long-term outcomes in primary PCI. Methods: In all, 239 STEMI patients received DES (n = 172) or BMS (n = 67) under IVUS guidance in primary PCI. The 3-year incidence of major adverse cardiac events (MACEs) including death, myocardial infarction (MI), target vessel revas-cularization (TVR), and ST was evaluated. Results: There was no difference in all cause mortality or MI. However, the in-cidence of TVR was 23.9% with BMS versus 9.3% with DES (p = 0.005). Thus, the number of MACEs was significantly lower with DES (11.0% vs. 29.9%; p = 0.001). The incidence of definite or probable ST was not different (1.5% vs. 2.3%; p = 1.0). IVUS-guided DES implantation (hazard ratio [HR], 0.25; 95% confidence interval [CI], 0.08 to 0.78; p = 0.017), stent length (HR, 1.03; 95% CI, 1.00 to 1.06; p = 0.046), and multivessel disease (HR, 3.01; 95% CI, 1.11 to 8.15; p = 0.030) were independent predictors of MACE. Conclusions: In patients treated with primary PCI under IVUS guidance, the use of DES reduced the incidence of 3-year TVR versus BMS. However, all cause mor-tality and MI were similar between the groups. The incidence of ST was low in both groups.
( Yun Kyeong Cho ),( Seung Ho Hur ),( Hyun Tae Kim ),( In Cheol Kim ),( Hyoung Seob Park ),( Hyuck Jun Yoon ),( Chang Wook Nam ),( Hyung Seop Kim ),( Seong Wook Han ),( Yoon Nyun Kim ),( Kwon Bae Kim 대한내과학회 2009 The Korean Journal of Internal Medicine Vol.24 No.4
Background/Aims: Recent intravascular ultrasound (IVUS) studies of sirolimus-eluting stents (SES) and paclitaxel-eluting stents (PES) have demonstrated a significant reduction in neointimal hyperplasia (NIH) based on simple coronary lesions. In this study, we evaluated the efficacy of SES and PES using IVUS in complex coronary lesions. Methods: Eighty-seven patients in whom 95 drug-eluting stents (66 SES and 29 PES) were implanted in complex coronary lesions were enrolled in this study. Case selection was based on the availability of IVUS and quantitative coronary angiographic (QCA) examinations at the index procedure and at follow-up. The neointimal volume index (volume/length: NIVI) and percent neointimal volume (% NIV) were calculated. The longitudinal length of stented segments without IVUS-detectable NIH was also evaluated. Results: The baseline patient demographics were similar between the SES and PES groups. At follow-up, no significant differences were observed in the vessel, plaque, or stent volume indices between the two groups. However, the NIVI and % NIV were significantly lower in the SES group (p<0.01). The longitudinal length of stented segments without IVUS-detectable NIH was significantly higher in the SES group (p<0.01). The net gain was significantly larger in the SES group (2.3±0.7 vs. 2.0×0.6 mm, p=0.025), while the rate of major adverse cardiac events was similar between the two groups. Conclusions: Although SES showed significantly greater suppression of NIH at follow-up, both stents were highly effective at inhibiting NIH in complex coronary lesions. (Korean J Intern Med 2009;24:323-329)
( Yun-kyeong Cho ),( Chang-wook Nam ) 대한내과학회 2018 The Korean Journal of Internal Medicine Vol.33 No.5
Multi-vessel coronary artery disease (MVD) frequently features ambiguous or intermediate lesions that may be both serial and complex, suggesting that multiple regions require revascularization. Percutaneous coronary intervention (PCI) is associated with various challenges such as appropriate identification of lesions that should be treated, the choice of an optimum revascularization method, and limitations of long-term outcomes. Optimal patient selection and careful targeting of lesions are key when planning treatment. Physiology-guided decision-making (based on the fractional flow reserve) can overcome the current limitations of PCI used to treat MVD regardless of clinical presentation or disease subtype, as confirmed in recent clinical trials. Here, we review the use of physiology-guided PCI for patients with MVD, and their early and late outcomes.
실리콘 잉곳 절삭시 발생하는 폐 PEG 색도 개선에 관한 연구
조윤경 ( Yun Kyeong Cho ),정경열 ( Kyeong Youl Jung ),심민석 ( Min Seok Sim ),이기호 ( Gi Ho Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
The chromaticity of polyethylene glycol (PEG) generated from the recyling of a silicone slurry waste was improved by using activated carbon powder and a carbon filter. The color change of the PEG waste was investigated by changing the amount of adsorbent, adsorption time and temperature. The surface area of activated carbon did not have a significant impact on improving the color of the PEG waste. According to the results for the APHA color variation of the PEG waste changing the amount of the carbon adsorbent, the optimal usage to achieve the low APHA value was 100~150 mg-C/g-PEG. From the investigatnion on the effect of the adsorption temperature range from 25˚C to 100˚C, it was found that the optimal temperatures were 40~50˚C in terms of achieving the lowest APHA value. The variation of the APHA color was investigated by changing the operation condition of the activated carbon filters. The use of ACF was a good way to enhance the chromaticity of the PEG waste. As a result, the APHA value of the PEG waste (APHA= 53 at the initial waste) was reduced to be 10 through the ACF purification. It was also confirmed that the performance of the used carbon adsorbent can be recovered by the washing with purified water.