• Journal of the Ergonomics Society of Korea
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• v.30 no.1
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• pp.75-86
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• 2011

This paper describes several current research activities and the field techniques for the prevention of human errors during the operation of nuclear power plants(NPPs). The human aspects such as 'fitness for the duties', 'job competence and suitability', 'types of communication', 'behaviors of field workers', 'teamwork of main control room crews', 'task procedures', etc. have been investigated for improving the performance of operating personnel in NPPs. We decide to develop a set of the complementary techniques for the reduction of human errors. The set of techniques developed includes teamwork criteria, jobs fitness analysis, procedure enhancement guide, 3-way communication, campaign posters, a behavior based safety program, a procedure guideline, and a task hazard identification method for the field practitioners in NPPs. These can offer a set of significant human error countermeasures to be considered for analyzing and reducing human error in NPPs as well as other fields of industry.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.11
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• pp.4770-4777
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• 2011

Recently a rapidly changing business environment, business strong ability and operating an integrated information system is actively made. However, the result of the success factors affecting the overall project, but a study to analyze the project's success is not enough. In this study, the project implementation and operation of the critical success factors that can occur in the analysis of research and practice leading to the combination of variables derived from empirical studies find and isolate the success factors were over. Present study came from existing projects that can be the integrated system, representation factors affecting the implementation and operation of business processes in order to analyze the elements and procedures, performance capabilities of the organization, consultants and professionals involved with other related variables were analyzed by injecting. In this study, the consultants and experts showed that the variables are very significant rather than the organization's ability to perform business processes and procedures. This study will give a guideline as future success factors for building an integrated system of professional experiences.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.1
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• pp.122-129
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• 2019

Due to its nature the manufacturing industry faces a cyclical economy, and therefore there is an urgent need for a companion industry to cope with this cyclic pattern in the long run. The sector suitable for meeting this demand is the repair and shipbuilding industry. In order to operate a shipbuilding repair business, a floating dock is indispensable, and most obsolete floating docks were imported from overseas and operated through repair/maintenance. However, there is no precise guideline for floating dock safety, and most models have been in use for at least 30 years without being required to enter classification at the time of operation. In this study, structural strength analysis was carried out using measured thickness information of aged floating docks, and the residual structural strength of floating docks in operation was analyzed. The main results derived from this study can be referred to as guidelines for the review of the structural safety of similar equipment, and it is expected that an optimal solution will be found within a short time using this method for repair/maintenance.

• Journal of the Korea Society of Computer and Information
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• v.27 no.3
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• pp.239-249
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• 2022

This study aims to analyze and compare the activating factors of domestic and overseas scuba diving resorts. Our delphi survey was conducted three times in 30 experts who involved in operation and management including scuba diving resort management representative and training team leader. As a result of comparing the activating factors at domestic versus overseas, it was found that common important activating factors included expansion of convenient facilities at public diving places, installation of safety and medical facilities for divers, development of first aid system including AED and oxygen ventilator, requirement of convenient facilities such as water lift and toilet in diving boat, installation of diving boat screw safety system, local boat operation guideline, regular course training program for scuba diving, employment of professional scuba diving instructor and guide, communication and promotion through various SNS portals, promotion by divers' word of mouth, involvement in regional Diving Resort Association, involvement in Korean Diving Association, communication and mutual benefit with local fishing villages, and linkage policy with local tourism industry.

• The Journal of Korean Obstetrics and Gynecology
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• v.35 no.2
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• pp.16-27
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• 2022

Objectives: The purpose of this study is to analyze educational effect of ultrasound examination training with ultrasonic phantom in the department of Korean Medicine Obstetrics and Gynecology. Methods: All 4^th grade students in 2021 and 2022 of school of Korean Medicine, Dong-Shin University must be trained in the department of Korean Medicine Obstetrics and Gynecology according to ultrasound examination training guideline including Objective Structured Clinical Examination (OSCE). After completing ultrasound examination training, we distributed questionnaires to them about a confidence before OSCE and after OSCE, difficulty in using ultrasound, ultrasound reading, difficulty with probe manipulation and computer operation, ultrasound understanding, clinical usefulness. And then, we analyzed the related factors including descriptive statistics, frequency analysis, student's t-test and paired t-test by SPSS 12.0. Results: Confidence in using ultrasound showed differences among students by gender and year, but it was not statistically significant. The difficulty of ultrasound use and ultrasound reading was at a moderate level, and the gender difference was not significant, and the difference between the practical students by year was statistically significant. The difficulty of the operation of the ultrasonic probe was at a normal level, and the difference between the students in practice by gender and year was not statistically significant. Although they answered that they had a very good understanding of the use of ultrasound, there was a gender difference and it was statistically significant, and practical students by year was not statistically significant. They answered that the effect on clinical use was very sufficient, but it was not statistically significant. The appropriateness of the practice time was evaluated at a moderate level. Conclusions: The use and educational effect of ultrasound examination using ultrasonic phantom in the department of Korean Medicine Obstetrics and Gynecology clinical practice education was very effective.

• Explosives and Blasting
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• v.42 no.2
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• pp.1-11
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• 2024

The purpose of this study is to suggest amendments for the effective operation of safety and health regulations that stipulate safety standards for the prevention of industrial accidents in blasting and tunneling works. Because the regulations on Occupational Safety and Health Standards have not been revised for a long time, the regulations do not meet the requirements in site, and it is reported that it is difficult to implement the regulations at workplaces due to various deficiencies. Therefore, this study aims to abolish or improve unreasonable regulations that do not fit reality due to changes in the technology environment, or to modify low-operability regulations considering domestic conditions in blasting and tunneling workplaces. By comparing domestic laws and standards related to blasting and tunneling works with foreign ones, the improvement measures were suggested.

• Journal of Korean Society of Water and Wastewater
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• v.37 no.6
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• pp.347-361
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• 2023

Water utilities are making various efforts to reduce water losses from water networks, and an essential part of them is to recognize the moment when a pipe burst occurs during operation quickly. Several physics-based methods and data-driven analysis are applied using real-time flow and pressure data measured through a SCADA system or smart meters, and methodologies based on machining learning are currently widely studied. Water utilities should apply various approaches together to increase pipe burst detection. The most intuitive and explainable water balance method and its procedure were presented in this study, and the applicability and detection performance were evaluated by applying this approach to water supply pipelines. Based on these results, water utilities can establish a mass balance-based pipe burst detection system, give a guideline for installing new flow meters, and set the detection parameters with expected performance. The performance of the water balance analysis method is affected by the water network operation conditions, the characteristics of the installed flow meter, and event data, so there is a limit to the general use of the results in all sites. Therefore, water utilities should accumulate experience by applying the water balance method in more fields.

• Journal of Electrical Engineering and Technology
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• v.11 no.6
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• pp.1656-1663
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• 2016

A capacitive wireless power transfer (C-WPT) system uses an electric field to transmit power through a physical isolation barrier which forms a pair of ac link capacitors between the metal plates. However, the physical dimension and low dielectric constant of the interface medium severely limit the effective link capacitance to a level comparable to the main switch output capacitance of the transmitting circuit, which thus narrows the soft-switching range in the light load condition. Moreover, by fundamental limit analysis, it can be proved that such a low link capacitance increases operating frequency and capacitor voltage stress in the full load condition. In order to handle these problems, this paper investigates optimal design of double matching transformer networks for C-WPT. Using mathematical analysis with fundamental harmonic approximation, a design guideline is presented to avoid unnecessarily high frequency operation, to suppress the voltage stress on the link capacitors, and to achieve wide ZVS range even with low link capacitance. Simulation and hardware implementation are performed on a 5-W prototype system equipped with a 256-pF link capacitance and a 200-pF switch output capacitance. Results show that the proposed scheme ensures zero-voltage-switching from full load to 10% load, and the switching frequency and the link capacitor voltage stress are kept below 250 kHz and 452 V, respectively, in the full load condition.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.2
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• pp.282-287
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• 2009

As current international guideline and IMO regulation give severe restrictions for ships to manage ballast water to reduce unintentional organism transfers, several ballast water treatment systems recently have been being developed together with filtration. That is because discharging ballast water from ships causes many pollutions by foreign biological invasive species. The primary treatment system being considered in this study was based on fine screen filtration technology applied to ballast water filter in ballast tank in order to reduce the load of ballast water treatment system. New ballast water filtration system was invented and analysed. The structural stress and strain analysis for ballast filtration systems which are current and invented filters were carried out using UGS and Ansys. The results showed that the structure of current filtering module was not designed to meet the requirement of sea water filtration during ballasting operation. The studies also showed that the invented design of filtration system equipped with back washing and automatic scrapper for eliminating cake of bio-species might be a potentially effective technology for ballast water management of ship's ballast tank.

• Journal of Digital Convergence
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• v.10 no.1
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• pp.341-347
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• 2012

The study provides the direction for constructing and operating ELN(Electronic Laboratory Notebook) system for systematic record, management and reliability security of the document. Firstly, Present the standard of the system environment for writing and management of ELN. Secondly, Establish guidelines for systematic maintenance and operation of ELN system. Thirdly, Draw up guidelines of inspection whether ELN system is managed in according with the standards and procedures. Therefore, it is expected that these guidelines contribute to vitalize ELN and set foundation of application for researching and developing information in the medium and long term.