• Proceedings of the Korean Operations and Management Science Society Conference
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• 1993.10a
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• pp.45-45
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• 1993

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1992.04b
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• pp.499-499
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• 1992

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1991.10a
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• pp.139-139
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• 1991

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.89-92
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• 2003

It is often that a large-scale linear programming(LP) problem may contain many constraints which are redundant or cause infeasibility on account of inefficient formulation or some errors in data input. Presolving or preprocessing is a series of operations which removes the underlying redundancy or detects infeasibility in the given LP problem. It is essential for the speedup of an LP system solving large-scale problems to implement presolving techniques. For the recovery of an optimal solution for the original problem from an optimal solution for the presolved problem, a special procedure, so called postsolving, must be applied. In this paper, we present how a postsolving procedure is constructed and implemented in LPABO, a interior-point based LP system. Briefly, all presolving processes are logged in a data structure in LPABO, and after the end of the solution method an optimal solution for the original problem is obtained by tracing the logs. In each stage of the postsolving procedure, the optimality of intermediate solutions is maintained. We tested our postsolving procedure on Netlib, Gondzio and Kennington LP data sets, and concluded that the computational burden of the procedure is relatively negligible compared with the total solving time.

• Journal of Korean Society for Quality Management
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• v.42 no.4
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• pp.685-700
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• 2014

Purpose: The purpose of this paper is to develop a systematic weighting procedure based on process capability indices method applying weighted mean squared error minimization (WMSE) approach to dual response surface optimization. Methods: The proposed procedure consists of 5 steps. Step 1 is to prepare the alternative vectors. Step 2 is to rank the vectors based on process capability indices in a pairwise manner. Step 3 is to transform the pairwise rankings into the inequalities between the corresponding WMSE values. Step 4 is to obtain the weight value by calculating the inequalities. Or, step 5 is to obtain the weight value by minimizing the total violation amount, in case there is no weight value in step 4. Results: The typical 4 process capability indices, namely, $C_p$, $C_{pk}$, $C_{pm}$, $C_{pmk}$ are utilized for the proposed procedure. Conclusion: The proposed procedure can provide a weight value in WMSE based on the objective quality performance criteria, not on the decision maker's subjective judgments or experiences.

• Journal of Korean Neurosurgical Society
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• v.39 no.3
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• pp.204-209
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• 2006

Objective : The authors retrospectively evaluate the benefits of the various pain procedures for the treatment of low back pain unresponsive to conservative management. Methods : Over a period of 2 years from May 2002 and June 2004, the authors had performed various pain procedures on 106 patients with low back pain. Epidural block, facet joint block, sacroiliac joint block, and myofascial block were included among various pain procedures. The pain improvement, period of analgesic use, and degree of satisfaction were evaluated 1 day, 4 weeks, and 6 months after injections. The outcome of pain procedures was analyzed by using a modified Macnab criteria. Results : Sixty-four patients had a single procedure with no combination and 42 patients [39.6%] received the combination of the various pain procedure. Regardless of the single or combination cases of procedure, combination of appropriate spinal level on each procedure was conducted in 104 [98.1%]. Mean follow up period was 12.2 months. Eighty-two patients [77.4%] experienced significant pain relief and overall analgesic medication was reduced in 91 patients [85.8%] at 6 months after procedure. Unfavorable results were demonstrated in 10 patients. Permanent procedural complications did not occur. Conclusion : The various pain procedures are the possible therapeutic option for low back pain unresponsive to conservative management including medication or physical therapy.

• Health Policy and Management
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• v.7 no.2
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• pp.46-64
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• 1997

Background & Objectives : Korea is face with the social need for health care technology assessment so that it is urgently needed to found principles and methodology in technology assessment in health care. As a groundwork for health care technology assessment, we tried to prioritize medical technology for assessment. Among medical technologies, procedure is somewhat difficult to assess, compared to drug or equipment. In this study, we aimed at the prioritisation of medical procedure to be assessed, in terms of efficay, safety, and adequacy. Method : For the standardized classification of medical procedure, ICD-9-CM(International Classification of Diseases 9th edition - Clinical Modification) was used. Among the list the procedures coming under otorhinolaringjology and thoracic surgery were selected by three family physicians. The list of procedure was mailed to the board certified surgeons of both disciplines, with the question asking about the necessity for assessment in terms of efficay, safety, and adequacy. Replied questionnaires were analyzed in each procedure. Results : Of 560 otorhinolaryngologist and 480 thoracic surgeon, 114 surgeons replied. Of otorhinolaryngological procedure, incision, excision, and destruction of inner ear : fenestration of inner ear : stapedectomy and its revision were the most urgent technology to assess in the aspect of safety. For adequacy, operations on Eustachian tube: fenestration of inner ear: incision, excision, and destruction of inner ear were highly ranked in necessity, and for efficary, operations on Eustachian tube; external maxillary antrotomy; fenestration of inner ear. Thoracic surgeons replied thoracic procedures, lung transplantation; heart transplantation; implantation of heart assist system [pump] are most important for evaluation in terms of safety; and heart transplantation; Lung transplantation; Implantation of heart assist system [pump] in terms of adequacy, and surgical collapse of lung [Artificia니 pnemothorax or pnuexoperitoeum]; lung transplantation; periarterial sympathectomy in terms of efficacy. As a whole, surgeons regard safety evaluation is more urgent than adequacy or efficary. In addition, otorhinolaryngological surgeons regard evaluation of their procedures more urgent than thoracic surgeons regard theirs. Conclusion : By the questionnaire to board certified physicians, we get some preliminary data for prioritisation of technologies to assess. Through the questionnaire like this, much information would be gathered for technology assessment, especially for medical procedure, if not enough. In the near future, well structured expert opinion gathering research, such as modified Delphi or nominal group technique, should be done succeedingly.

• Journal of Information Technology Services
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• v.20 no.1
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• pp.41-54
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• 2021

The SW-centered battlefield management information system R&D project takes a long period of 5-10 years or more by applying a complex and rigid batch acquisition strategy. In order to solve this problem, it is necessary to institutionalize a rapid and flexible battlefield management information system R&D project management procedure applying agile development methodology, and a government project management organization and contract management method to support it In this study, we analyzed the case of applying the Agile development method centered on Scrum to the US SW-centered weapon system R&D project and the characteristics and problems of the battlefield management information system R&D project in Korea, and suggested improvement measures as follows. First, the battlefield management information system R&D model applies the hybrid development method, and the system requirements analysis and system structure design use the existing waterfall development procedure, and the agile method is applied from the SW requirements analysis to the system integration stage. Second, flexible adjustment of performance, schedule, and cost by organizing an Agile IPT in which military (requirements) - DAPA (project management) - developer - functional specialized organizations (test and evaluation, quality, government research institutes, etc.) participate. Third, improving the Basic Order Agreement so that it can be applied to agile R&D.

• Bulletin of the Korean Chemical Society
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• v.34 no.11
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• pp.3239-3242
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• 2013

An improved rapid method for determination of the fatty acid composition using modified methylation procedure was compared with the AOAC reference procedure based on the methylation of fatty acid with the addition of BF3 catalyst before and while heating. The new method is useful for research and routine quality control and has a number of advantages over the reference procedure which are more rapid, simple and also reliable. Applicability of the modified methylation method was confirmed with three vegetable oil samples (palm oil, coconut oil and olive oil). Based on the validation method results, we obtained that a quite linear calibration curve of fatty acids was performed with $R^2$ in range of 0.9972-0.9994. The sensitivity of gas chromatography instrument was able to analyze the fatty acids up to a few ppm, the precision and accuracy were good enough with the %RSD between 1.5%-19.5% and the recovery of linolenic acid was 99.1% in the range of 80.0%-113.3%.

• International Journal of Advanced Culture Technology
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• v.10 no.1
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• pp.108-115
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• 2022

The purpose of this study is to investigate the actual status of antithrombotic management before and after the procedure or surgery, the difference between the duration of medication suspension by clinical and demographic characteristics, and the patient's understanding and satisfaction after medication management by a dedicated nurse. The results were as follows. The most commonly used antithrombotic agents were aspirin and flavitol. The drug discontinuation period according to antithrombotic, procedures, and underlying diseases, there was a significant difference in duration for each variables(p<.000). In the case of antiplatelet drugs, 5-day suspension was the most frequent, and anticoagulants 2-day suspension was the most frequent. Depending on the procedure,colonoscope,nucleoplasty,rotator cuff repair,and total knee arthroplasty commonly showed more than 80% of 5-day discontinuation. The differences according to underlying diseases are as follows. 64.7% of all diseases discontinued on the 5th. The patient's understanding of the nurse's medication management performed before and after the procedure was found to be lower in Angina patients than those with other diseases. In terms of age, those in their 50s showed higher understanding than other age groups. There were no differences in understanding and satisfaction with the remaining characteristics.