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허지원,최광연,이분희,심세훈,양종철,김용구 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.2
Objectives : A lots of studies have investigated the psychosocial characteristics of suicidal attempters in order to find eff-cient coping strategy and treatment intervention. The purpose of this study was to examine the psychosocial factors affecting the suicide attempt in psychiatric patients. Methods : Two hundred eighty patients who attempted suicide and admitted in the emergency room in 3 university hospitals from December 2003 to May 2006 were recruited in this study. The patients were interviewed using Structured Clinical Inter-view for DSM-IV Axis I disorder (SCID-RV), Lethality of Suicide Attempt Ratings Scale (LSARS) and Risk-Rescue Rating system (RRR). Results : The suicide attempters have psychosocial characteristics of female preponderance, age 20-39, high school in educational level, married in marriage condition, inoccupation, house makers in occupation. Most of attempters used the non-severe methods such as drug ingestion or wrist cutting, and selected home as the place of attempt. The delay until discovery was less than 4 hours for most suicide attempters, and the rate of asking for help directly or dropping clues were high. Major depressive disorder was the most common psychiatric illness among attempters. Conclusions : The present study would be the early stage to explore the risk factor and protect factor of suicidal attempt. This study suggests that the closed observation to potential-suicidal attempter in daily life is critical to protect against the fatal results due to suicidal attempts.
국부가설을 적용한 불균일 가열 수직 원형관에서의 임계열유속 예측
이지수,이성우,김준연,심재우 한국공업화학회 2004 응용화학 Vol.8 No.2
임계열유속 현상이 국부조건변수로 정확히 예측될 수 있다는 가설에 따라 증기 생성률 방정식을 이용해 실제증기건도를 관의 길이에 따라 계산하였으며, 그에 따라 관의 길이에 따른 국부 임계열유속 크기를 계산할 수 있었다. 관에 적용된 열유속분포의 형태와 국부 임계열유속 크기를 감안하여 두 곡선이 전하는 부분을 계산함으로써 임계열유속예측상관식을 개발하였다. 임계열유속 data는 6종, 총 305개를 사용하였으며, 예측 결과는 평균오차 1%, RMS 오차 17%로 분석되었다.
균일 가열 수직 원형관에서의 R-12 임계열유속 예측 상관식 개발을 위한 파라미터의 경향성 분석
이지수,이성우,박주용,김준연,심재우 한국공업화학회 2004 응용화학 Vol.8 No.2
The important parameters that have significant effects on the prediction of CHF (Critical Heat Flux) for R-12 (Dichlorodifluoromethane) were investigated. This was a preliminary study for a R-12 CHF correlation in uniformly heated vertical round tubes. Experimental data of Celata [1], Green and Stevens [2], Groenveld [3], Ilic [4], Katto [5], Merilo and Ahmad [6] and Stevens and Miles [7] were used for this analysis. Four representative CHF data sets at pressure condition of 9, 15, 19, and 27 bar were selected, analyzed, and compared to evaluate the effects other than the system pressure on the CHF were tube diameter (D), mass flux of water (G), and local true mass fraction of vapor (X_(t)). The results of this study have reaffirmed the feasibility that an advanced R-12 CHF correlation for uniformly heated vertical round tubes can be found.
정재원,김일수,박창언,김학형,서주환,김인주,심지연 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
The development of robotic welding process is a very complex assignment because the system is affected by a number of process parameters which are very difficult to determine or predict in practice. The full automation welding has not yet been achieved partly because the mathematical model for the process parameters of a given welding task is not fully understood and quantified. Several mathematical models to control welding quality, Productivity, micro structure and weld properties in arc welding processed have been studied. However, it is not an easy task to apply them to the various practical situations because the relationship between the process parameters and the bead geometry is non-linear and also they are usually dependent on specific experimental result. Practically, it is difficult, but important to know how to establish a mathematical model that can predict the result of the actual welding process and how to select the optimum welding condition under a certain constraint. In this paper, an attempt has been made to develop an neural network model to predict the back-bead width as a function of key process parameters in the GMA (Gas Metal Arc) welding and to compare the developed models with the experimental results
Ji Yeon Park,Yoonseok Heo,Yong Jin Kim,Joong-Min Park,Seong-Min Kim,Do-Joong Park,Sang Kuon Lee,Sang-Moon Han,Kyung-Won Shim,Yeon Ji Lee,Ja Youn Lee,Jin-Won Kwon 대한외과학회 2019 Annals of Surgical Treatment and Research(ASRT) Vol.96 No.6
Purpose: Long-term results following bariatric surgery compared to conventional treatments has never been reported in morbidly obese Korean patients. This study aimed to evaluate the long-term efficacy of bariatric surgery in morbidly obese Korean patients compared to conventional medical treatments. Methods: In this multicenter retrospective cohort study, we reviewed 137 obese subjects between January 2008 and February 2011 with a body mass index (BMI) > 30 kg/m2 who had more than 5 years of follow-up clinical data after bariatric surgery (surgery group, n = 49) or conventional treatment (conventional treatment group, n = 88). Anthropometric data and the status of comorbidities were compared between the 2 groups. Results: The median follow-up period was 72.1 months (range 19.3–109.7 months). At the last follow-up, the surgery group showed a greater amount of total weight loss than the conventional treatment group (24.9% vs. 2.8%, P < 0.001). The prevalence of diabetes and hypertension significantly decreased in the surgery group, while the conventional treatment group showed a marked increase in these comorbidities. In the surgery group, Roux-en-Y gastric bypass and sleeve gastrectomy achieved comparable long-term weight loss (26.5% vs. 22.4%, respectively; P = 0.087). Conclusion: In the long-term, bariatric surgery achieved and maintained significantly greater weight reduction, as well as a decrease in obesity-related comorbidities, than did conventional medical therapy in morbidly obese Korean patients
Ji-Yeon Shim(심지연) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.12
Magnetic pulse welding (MPW) is an effective process for joining dissimilar materials because it uses only the electromagnetic force through the electromagnetic interaction between the working coil and the outer tube. In MPW, the electromagnetic force drives the outer tube to impact the inner tube, thereby achieving a successful solid-state metallurgical bonding. However, the outer tube, as a flyer workpiece, collides with the inner tube at a high velocity, leading to severe compressive deformation of the inner tube during welding. Nevertheless, improvement in the tubular joint quality by reducing the compressive deformation of the inner tube has not yet been achieved. Thus, the purpose of this study was to determine an appropriate way to reduce the compressive deformation of the inner tube through coil design. For this purpose, two types of working coils were designed, and the electromagnetic interaction between the working coil and the outer tube was analyzed by simulation. A uniform distribution of the electromagnetic force was achieved by employing a flat coil; however, this resulted in severe compressive deformation of the weldment. Nevertheless, a groove-shaped coil led to reduced compressive deformation by decreasing the continuous inner tube collapse.
Shim Ji Yeon,Park Min Woo,ll Soo Kim 대한용접접합학회 2023 대한용접·접합학회지 Vol.41 No.1
As lightweight automotive structures improve fuel efficiency and reduce carbon dioxide emission, they have gar- nered extensive attention. Vehicle mass reduction, which is a key problem for next generation eco-friendly vehicles, can significantly increase mileage. Hence, industries have committed to replace conventional materials with light- weight materials, such as advanced high strength steel. Additionally, automotive industries are hindered by chal- lenges in the field of joining technology. A novel welding technology called resistance element welding (REW), which is an appropriate thermal-based joining method, was developed recently for joining hybrid materials with oth- er structural steel grades. In this study, the state of the art joining and the process characteristics for dissimilar metal joints have been presented because related studies show limited investigation in this area. Following by the state of them, the principal and welding quality of REW, experimentally and numerically, are reported to give compre- hensive information on the current practices and research interest related to technologies. Finally, extensive work was concentrated on portional joining optimization techniques to improve different materials.