• Proceedings of the KOR-BRONCHOESO Conference
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• 1991.06a
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• pp.26-26
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• 1991

기관 절개술은 절대적으로 필요한 수술 방법임에도 불구하고 경우에 따라서는 매우 심각한 합병증이나 후유증을 유발하고 있어 가능한 피하는 것이 좋으며 부득이하여 시술을 하더라도 그 적절한 시기를 정하기 어려운 경우가 많다. 특히 유소아에서는 최근에 개량된 삽관튜브의 출현으로 비교적 장기간의 기관삽관이 가능해지자 기관절개술의 적용예가 많이 감소하기는 하였으나 합병증이나 후유증을 너무 우려한 나머지 기관절개술을 기피하거나 적절한 수술시기를 놓쳐 더욱 어려운 입장에 처하게 되기도 한다. 저자들은 1977년도부터 1990년까지 세브란스 병원에서 기관절개술을 시행받은 15세이하의 유소아 환자 94례에서 기관절개술의 원인 질환과 적용시기 및 합병증을 알아보고 기관삽관과의 관계를 후향적으로 조사하여 다음의 결과를 얻었다. 1. 유소아 기관 절개술의 원인 질환은 두부외상이 28례(29.8%)로 가장 많았고, 신경계 질환 17례(18%), 기도 감염 10례(10.6%)의 순이었고 그 외 선천적 기형 종양, 외상, 감염 등으로 다양한 분포를 보였다. 2.기관 절개술전에 기관삽관을 시행하지 않았던 예는 18례(19.1%)이고 기관삽관을 시행했던 예는 76례(80.9%)이며, 38례(40.4%)는 일주이내에 기관절개술을 시행하였고 12례(12.8%)는 2주이내에, 8례(8.5%)는 3주이내, 6례(6.4%)는 4주이내에 시행하였으며 12례(12.8%)는 기관 삽관후 4주이후에 기관절개술을 시행하였다. 3.기관 절개술후, 합병증은 26례(27.7%)에서 있었고 육아조직 형성이 14례(14.9%) 였고 기관 협착이 12례(12.8%)의 순이었다. 4.인공 호흡기률 사용하였던 46례(48.9%)중 14례(14.9%)에서 합병증이 있었고, 인공 호흡기를 사용치 않았던 48례(51.5%)에서는 12례(12.8%)에서 합병증이 발생하였다. 5.삽관 발거를 시행할 수 있었던 예는 47례(50%)였으며, 기관 절개술후 1개월이내에 시행한 예가 21례(16%), 6개월이내 시행한 예가 16례(17%), 2년이내에 시행한 예가 6？(6.4%)였으며 2년 이후 시행할 수 있었던 예도 4례(4.3%) 있었다. 6.기관 절개술 환자중 26례(27.7%)는 원인 질환으로 결국은 사망하였으며, 21례(22.3%)는 삽관 발거를 하지 않은 상태에서 퇴원하여 추적이 불가능하였다.

• The Transactions of the Korea Information Processing Society
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• v.5 no.3
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• pp.633-648
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• 1998

Rapid computing environment, change of the application structure, and various user demand will increase the demand of the software development. Version control is helpful to improve productivity using delta, and useful to establish component from existing data of source code. This paper presents the design and implementation of the version control system. which is composed of retrieval system and delta management system. In retrieval system, vanous retrieve methods arc proposed. This methods provides the process methodology with filename, content, size and date. Various retrieve methods arc important for the effective delta management. Meta data can be easily composed for the delta management by these methods. Compared with other systems, this implemented version control system has some advantage. First, for delta management, version maintenance for delta management becomes easier by integrating the forward and back-ward methods. Second, delta managent part of a project is to unite the forward and backward method. the effieiency of this system is to increased in management. Also, this system supports a thechnique of using the database and files for project repository and makes the version management more effective.

• Journal of Korean Academy of Nursing
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• v.50 no.6
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• pp.837-847
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• 2020

Purpose: The purpose of this study was to investigate the effects of hospital characteristics on employment rate, working period, and retirement of ward nurses in Korea through a retrospective cohort study based on HIRAS data. Methods: Data were obtained from a report on medical care institutions of Health Insurance Review & Assessment Service (HIRAS). Data from 259,941 nurses who were working for a day or more from January 1, 2012, to December 31, 2016, at 2,942 medical care institutions were analyzed. Life table method analysis, Kaplan-Meier analysis, and Cox proportional hazard regression analysis were conducted. Results: The employment rates of 5 yeas and 10 years for the total sample were 38% and 28%, respectively. The estimated mean value of the working period was 3,642.7 days (SE: 17.4 days). Cox proportional hazard regression analyses revealed that nurses who were working at the general hospital/hospital, clinic, and nursing hospital were more likely to leave the hospital compared to those who were working at the 3rd general hospital. Nurses who were working at the medical institutions which were located in cities and countries, established by the private foundation, rated lower levels of nursing, and owned an insufficient number of beds, nurses and doctors were more likely to leave their workplace compared to those of the counterparts. Conclusion: This study indicates that hospital characteristics may play a significant role in retirement and working period of ward nurses in Korea. The improvement of hospital conditions to reduce ward nurses' retirement are needed.

• Proceedings of the KSME Conference
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• 2007.05b
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• pp.2378-2383
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• 2007

Direct Numerical Simulation was carried out to predict mass transfer in turbulent flow around a rotating stepped cylinder. This investigation is a follow-up study of Nesic et al. [Corrosion, Vol. 56, No. 10, pp. 1005 - 1014] The original motivation of this work stemmed from the efforts to design a simple device which can generate flows of high turbulence intensity at low cost for corrosion researchers. Two cases were considered; Sc=1 and 10 both at Re=335. Here, Sc and Re stand for Schmidt number and Reynolds number, respectively, based on the step height and the surface speed of the cylinder upstream the step. Main focus was placed on the correlation between turbulent fluctuation and concentration field. The spatio-temporal evolution of concentration field is discussed. The numerical results are qualitatively compared with those of the experiment conducted with the same flow configuration.

• Journal of computational fluids engineering
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• v.15 no.2
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• pp.55-61
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• 2010

A dependence of weighting parameter in preconditioning method for solving low Mach number flow with incompressible flow nature is investigated. The present preconditioning method employs a finite-difference method applied Roe‘s flux difference splitting approximation with the MUSCL-TVD scheme and 4th-order Runge-Kutta method in curvilinear coordinates. From the computational results of benchmark flows through a 2-D backward-facing step duct it is confirmed that there exists a suitable value of the weighting parameter for accurate and stable computation. A useful method to determine the weighting parameter is introduced. With this method, high accuracy and stable computational results were obtained for the flow with low Mach number in the range of Mach number less than 0.3.

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.3
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• pp.624-634
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• 1994

A numerical method which combines equal-order velocity-pressure formulation originated from SIMPLE algorithm and streamline upwinding method has been developed. To verify the proposed numerical method, we considered the lid-driven cavity flow and backward facing step flow. The trend of convergence history is stable up to the error criterion beyond which the maximum value of error is oscillatory due4 to the round-off error. In the present study, all results were obtained with the single precision calculation up to the given error criterion and it was found to be sufficient for our purpose. The present results were then compared with existing experimental results using laser doppler velocimetry and numerical results using finite difference method and mixed interpolation finite element method. It has been shown that the present method gives accurate results with less memories and execution time than the coventional finite element method.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.4
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• pp.201-208
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• 1996

This paper proposes an efficient method for improving the training performance of the neural network using a hybrid of backpropagation algorithm and dynamic tunneling system.The backpropagation algorithm, which is the fast gradient descent method, is applied for high-speed optimization. The dynamic tunneling system, which is the deterministic method iwth a tunneling phenomenone, is applied for blobal optimization. Converging to the local minima by using the backpropagation algorithm, the approximate initial point for escaping the local minima is estimated by the pattern classification, and the simulation results show that the performance of proposed method is superior th that of backpropagation algorithm with randomized initial point settings.

• Korean Journal of Clinical Pharmacy
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• v.21 no.3
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• pp.243-248
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• 2011

낙상은 노인의 건강을 위협하는 가장 심각한 문제 중의 하나이며, 조기사망, 신체손상, 운동장애, 심리학적 기능장애를 유발하는 원인이기도 하다. 본 연구의 목적은 국내 노인전문 요양병원 입원 환자들의 의약품 사용이 낙상에 미치는 영향을 평가하는데 있다. 후향적으로 원내 의무기록 정보를 이용하여 환자-대조군 연구를 수행하였고, 2008년 1월부터 2010년 12월까지 3년 기간에 입원한 65세 이상을 대상으로 하였다. 입원기간 중 낙상을 경험한 34명의 노인환자들을 환자군으로 선택하였으며 낙상을 경험하지 않은 68명의 노인환자들을 무작위 추출하여 1:2의 환자군:대조군비율로 연구 대상 환자들을 선정하였다. 환자군이 복용한 의약품을 대조군이 복용한 의약품과 비교하였으며 각 계열별 의약품과 낙상위험도 관계를 평가하였다. 두 그룹간의 인구통계학적 특성은 유사하였고 연령, 성별, 복용 의약품수, 고혈압 유무, 혈중 크레아티닌 수치, 혈중 나트륨 수치, 혈압 또는 심박수에 유의한 차이는 없었다. 항히스타민제와 본 연구에서 유일하게 기타 수면보조제로 분류된 졸피뎀이 유의하게 낙상위험도를 증가시켰다.

• Journal of Korean Medicine Rehabilitation
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• v.24 no.3
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• pp.139-148
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• 2014

Objectives The aim of this study was to investigate the relationship between the improvement of low back pain and lumbosacral-pelvic parameters. Methods Fifty one patients were classified into the normal group and the abnormal group, based on X-ray. In each group, lumbosacral-pelvic parameters were measured. The data were analysed by independent t-test. Results The significant difference of the parameters of Femur Height was found in the normal group and the abnormal group. Conclusions These results show that we can predict effect of LBP treatment by investigating the parameters of and Femur Height.

• Proceedings of the KSLP Conference
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• 1997.11a
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• pp.257-257
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• 1997

1996년 10월부터 1997년 6월까지 안ㆍ이비인후과병원과 영동세브란스병원 이비인후과에 음성장애를 주소로 내원한 환자 중 성대양성질환으로 성대미세수술을 시행하고 음성검사를 시행한 환자들을 대상으로 하였다. 대상환자는 총 85명으로 후향적으로 의무기록을 검토하여 수술시 병명, 수술시 레이저(laser)사용유무, 수술 후 발성장애 유무를 확인하였으며 그 중 수술 후 지속적인 혹은 반복적인 발성장애를 보인 환자는 총 12명으로 발성장애의 원인과 치료의 종류 및 치료효과를 판정하기 위해 후두비디오스트로보 스코피 검사, 청각심리검사 및 음성분석을 확인하였으며 통계처리를 하였다. (중략)