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최웅지,조남수,조수형,김성중,박광철,박진실 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.1
Background and Objectives: The objective of this study was to obtain circumstances about violence providers and cause of the violence in emergency room. Materials and Methods: Reports were provided to emergency department doctors, nurses and emergency medical technicians working in Chosun University Hospital Emergency Center during the sixty days from 26 May 2003 to 24 July 2003. Report form consisted of the degree of violence, the reason for the violence, dermographic information about violence providers, outbreak time of violence and response of emergency personnels. Results: SixtyUeight case of violence in the emergency department were reported. Almost all of the violence was due to the male gender and high incidence in third and fourth decade. The violence occured mostly in the night shift. 55.9% of violence was done by patient and 41.2% was done by patient's guardians. The leading cause of violence were alcohol drunken and delay of laboratory test and treatment. Verbal abuse and threats were the most concern form of violence, Conclusion: It is necessary to solve the problems faced in the emergency department not only administrative and financial aid but also regular preventive education and further study.
대퇴동맥을 통한 경피적 관동맥 중재시술 환자의 천자부위 지혈을 위한 Angioseal^(�) 사용과 고식적 용수 압박법의 비교 : 전향적 연구
김용훈,권현철,김필호,안석진,유철웅,최진호,이상철,김준수,김덕경,전은석,이상훈,홍경표,박정의,서정돈 대한내과학회 2004 대한내과학회지 Vol.66 No.5
목적 : 경피적 관동맥 중재술은 최근 양적 및 질적으로 급격한 발전을 보였지만 시술 시 천자부위의 혈관 합병증은 아직 해결해야 할 문제점이다. 저자들은 대퇴동맥을 통한 경피적 관동맥 중재술을 환자에게 천자부위 지혈을 위한 혈관폐쇄기구인 안지오실의 안전성과 유용성을 고식적인 용수 압박법과 비교 연구하고자 하였다. 방법 : 2002년 4월부터 2003년 5월 사이에 삼성서울병원 심장혈관센터에서 대퇴동맥을 통한 경피적 관동맥 중재술을 성공적으로 시행한 200명의 환자(안지오실 사용군: A군, 100명, 고식적 용수압박법 사용군 B군, 100명)를 대상으로 시술 후 주요 합병증 및 경한 합병증, 지혈 후 환자가 자리에 앉기까지의 시간, 보행개시 가능시간, 총 재원 기간과 시술 1주 후의 합병증을 전향적으로 조사하여 비교 연구하였다. 결론 : 두 군에서 연령, 성별, 기저질환, 심혈관 질환의 위험요소, 시술의 종류, 시술 중 사용한 헤파린의 양, clopidogrel의 양, ticlopidine의 양, 지혈 시 수축기와 확장기혈압, ACT (activated clotting time)는 차이가 없었다. A군이 B군에 비해 시술 후 자리에 앉기까지의 시간 (A군: 4.3±0.3시간, B군: 13.7±0.8시간, p=0.004) 및 보행개시까지의 시간(A군: 6.8±0.5시간, B군: 18.8±2.1시간, p=0.013)이 유의하게 짧았다. 시술 후 주요 합병증은 두군 모두에서 관찰되지 않았으며, 경한 합병증의 전체발생은 A군에서 유의하게 적었다(A군: 28명, B군: 19명, p=0.003). 반상출혈의 경우는 A군에서 유의하게 낮았지만(A군: 3명, B군: 12명, p=0.01), 혈종, 출혈의 발생은 두군간에 차이가 없었다. 총 재원기간에는 두 군간에 차이가 없었다(p=0.239). 시술 1주 후 경과관찰에서 주요합병증은 역시 두 군 모두에서 관찰되지 않았으며, 경한 합병증의 전체발생은 두 군에서 차이가 없었다(A군: 15명, B군: 13명 p=0.418), 반상출혈의 빈도는 차이가 없었지만 혈종의 발생은 A군에서 더 낮았다(A군: 2명, B군:6명, p=0.004). 두 군 모두에서 출혈은 발생하지 않았다. 결론 : 대퇴동맥을 통한 경피적 관동맥 중재술을 시행한 환자에서 안지오실의 사용은 고식적 용수 압박법에 비해 환자의 침상 안정시간을 줄여 조기 활동개시가 가능하게 하였으며 국소합병증의 위험도를 일부 낮추어, 시술에 따른 환자의 불편을 현저하게 감소시킬 수 있다고 할 수 있을 것으로 기대된다. Background : Although the number and the quality of percutaneous coronary intervention have been recently increased dramatically, the vascular complication at puncture site is still the major cause of patients' morbidity. We evaluated the safety and efficacy of newly of newly-developed collagen-based arterial closure device, Angioseal after transfemoral percuatenous coronary intervention. Methods : This study was designed as a prospective single center non-randomized comparative study. A total 200 patients undergoing transfemoral percutaneous coronary intervention were enrolled between April 2002 and May 2003. They were divided into two groups; Angioseal group (group A, n=100) and manual compression group (group B, n=100). The baseline clinical and angiographic characteristics were reviewed. The time to sit up, the time to ambulation, the duration of hospital stay, major and minor vascular puncture site complications were monitored. The patients were followed-up for 1 week after procedure by telephone. Results : The baseline clinical characteriwtics, clinical diagnosis, cardiocascular risk factors, typesof procedure, doses and numbers of anticoagulants were similar between two groups. The blood pressure and activated clotting time were also similar. The time to sit up (group A: 4.3±0.3 hours, group B: 13.7±0.8 hours, p=0.004) and the time to ambulation (group A: 6.8±0.5 hours, group B: 18.8±2.1 hours, p=0.013) were shorter in group A. No major vascular complications were noted. The incidence of hematoma and bleeding were not significantly different between two groups. The incidence of ecchymosis, however, was significantly lower in group A (group A:12%, group B: 3%, p=0.001) The duration of gospital stay was similar between groups. During 7 days of follow-up period incidence of hematoma was significantly lower in group A (p=0.004). Although the incidence of ecchymosis was not significantly different between two groups. Conclusion : The angioseal may be associated with earlier ambulation and less patients' morbidity with low incidence of local complication rate compared to manual compression after transfemoral percutaneous coronary intervention.
A Study on Trial-Experience Information System of Fashion Shopping Malls with Digital Representative
Cheol-Woong Lee,Hee-Kyung Choi,Jung-Yi Chae,Il-Hong Jung,Hyo-Yong Kim,Sae-Hong Cho 한국멀티미디어학회 2008 한국멀티미디어학회 국제학술대회 Vol.2008 No.-
With rapid development of high speed network and communication through online, the tendency of online consumers and life style of modem people are changing. Consumers tend to emphasize their unique characteristics and they want to differentiate from others. Based on this trend, firms need to build a new marketing system to satisfy the consumers' various desires. The System is called an indirect dressing method. This method will provide an avatar and consumers dress the avatar with their preferred style. This system will be able to increase the satisfaction of the consumers' need and flow of the business between consumers and firms.
와전류 탐상을 이용한 탄소섬유 복합재료 튜브의 미소원공 결함깊이 평가
김철웅(Cheol-Woong Kim),조준영(Jun-Young Cho),이정빈(Jung-Bin Lee),백지웅(Ji-Woong Baek) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The applicability of the ultrasonic C-scan inspection is restricted due to the deterioration of mechanical properties of specimen during the test. As today is getting into the period of the Carbon Fiber Reinforced Plastic (CFRP) laminates, the needs of inspection method of variable defects such as ultrasonic C-scan method is getting greater than before. Despite of this, applicability of the ultrasonic C-scan method is restricted due to the variation of mechanical properties of CFRP laminates during the test process. Therefore, the aim of this research is applied to Eddy Current Test (ECT) using the CFRP tube. ECT is one of the techniques used to perform Electromagnetic (ET) inspections. ECT is used to inspect a wide range of ferrous and non-ferrous material for defects or deterioration without damaging the material. The main objective of this study is to evaluate the investigation of ECT for the inspection of defects containing saw-cut and hole in CFRP tube. This study considered the following points; 1) The development of CFRP tube specimen for the applicability of ECT, 2) Analysis of ECT signals for the inspection of defect containing a saw-cut and hole, 3) The evaluation of relationship between hole defect depths (tube thickness of 20%, 40%, 60%, 80%, 100%) and ECT signal in CFRP tube.
Jung-Joon Cha,Jong-Youn Kim,Hyoeun Kim,Young-Guk Ko,Donghoon Choi,이재환,Chang-Hwan Yoon,In-Ho Chae,Cheol Woong Yu,Seung Whan Lee,Sang-Rok Lee,Seung Hyuk Choi,Yoon Seok Koh,Pil-Ki Min 대한심장학회 2022 Korean Circulation Journal Vol.52 No.6
Background and Objectives: Endovascular therapy (EVT) first strategy has been widely adopted for the treatment of chronic limb threatening ischemia (CLTI) patients in real-world practice. This study aimed to investigate long-term outcomes of CLTI patients who underwent EVT and identify prognostic factors. Methods: From the retrospective cohorts of a Korean multicenter endovascular therapy registry, 1,036 patients with CLTI (792 men, 68.8 ± 9.5 years) were included. The primary endpoint was amputation-free survival (AFS) defined as the absence of major amputation or death. Secondary endpoints were major adverse limb events (MALE; a composite of major amputation, minor amputation, and reintervention). Results: Five-year AFS and freedom from MALE were 69.8% and 61%, respectively. After multivariate analysis, age (hazard ratio [HR], 1.476; p<0.001), end-stage renal disease (ESRD; HR, 2.340; p<0.001), Rutherford category (RC) 6 (HR, 1.456; p=0.036), and suboptimal EVT (HR, 1.798; p=0.005) were identified as predictors of major amputation or death, whereas smoking (HR, 0.594; p=0.007) was protective. Low body mass index (HR, 1.505; p=0.046), ESRD (HR, 1.648; p=0.001), femoropopliteal lesion (HR, 1.877; p=0.004), RC-6 (HR, 1.471; p=0.008), and suboptimal EVT (HR, 1.847; p=0.001) were predictors of MALE. The highest hazard rates were observed during the first 6 months for both major amputation or death and MALE. After that, the hazard rate decreased and rose again after 3–4 years. Conclusions: In CLTI patients, long-term outcomes of EVT were acceptable. ESRD, RC-6, and suboptimal EVT were common predictors for poor clinical outcomes.
Surface bio-modification of titanium implants by an enamel process
Cheol Y. Kim,Jung Woong Lee 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.4
A bioactive bio-enamel was prepared by coating two different glasses on a titanium metal in sequence, the first coat was for better bonding between a bio-enamel and the titanium and the second coat for promoting its bioactivity, which means hydroxyapatite formation. The ground glass coat and bioactive glass coat were fired at 900 °C for 5minutes and 850 °C for 30 seconds in an Ar atmosphere, respectively. The hydroxyapatite forming behavior on the bio-enamel was compared with that on the bulk bioactive glass with the same composition of the bio-enamel. The rate of hydroxyapatite formation on the bioenamel was much faster than that on the corresponding bulk bioactive glass. The behavior of hydroxyapatite formation also improved when the bulk bioactive glass was heat-treated at 850 °C for 20 seconds. It is believed that the heat-treatment of the glasses makes the leaching of cations from the glass surface easier and enhances the rate of the hydroxyapatite formation.