• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.2
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• pp.199-206
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• 2015

In this study, a new diagnosis method which can predict the working states of a pipe or its element in realtime is proposed by using an artificial neural network. The displacement data of an inspection element of a piping system are obtained by the use of PIV (particle image velocimetry), and are used for teaching a neural network. The measurement system consists of a camera, a light source and a host computer in which the artificial neural network is installed. In order to validate the constructed monitoring system, performance test was attempted for two kinds of mobile phone of which vibration modes are known. Three values of acceleration (minimum, maximum, mean) were tested for teaching the neural network. It was verified that mean values were appropriate to be used for monitoring data. The constructed diagnosis system could monitor the operation condition of a gas pipe.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.24 no.2
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• pp.182-192
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• 2014

Objectives: The aim of this study is to analyze the current status of possession of measurement and analytical instruments at work environment monitoring organizations and their relationships with human resources, including the number of professional engineers and evaluation scores resulting from evaluation programs in 2012. Materials: Data for measurement and analytical instruments were gathered by inspectors who had been assigned by the Korea Occupational Safety and Health Agency(KOSHA) and the Ministry of Employment and Labor(MoEL) during the evaluation program for 2012. Data for 11 monitoring instruments and nice pieces of analytical equipment were collected from 103 organizations. Additional data such as the type of service provides and the number of professional engineers employed were also recorded by the inspectors. Evaluation scores could be acquired from KOSHA. Results: Comprehensive Occupational Health Service Providers showed good operation quality, while University or Hospital Subsidiary and Work Environment Monitoring Organizations recorded relatively poor results. Evaluation scores correlated well with the possession of measurement instruments and human resources for each organization. High yields provided by professional engineers also showed statistically-associated contributions to evaluation scores and monitoring instrument possession. Compared with monitoring instruments, the amount of analytical equipment had little positive impact on organizations' competence. Conclusions: The evaluation results for domestic monitoring organizations revealed that human resources, possession of instruments, and the quality of employees were critical factors for operating the corporations. Each organization should give considerable effort to improving their ability to strengtheninternal quality, resulting in high-yield production for workers and employers by providing improved workplace monitoring services.

• Journal of the Korean Society of School Health
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• v.1 no.2
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• pp.66-85
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• 1988

This paper reviewed present status of school health program in Korea to seek. The improvement of health of school children. The results are summarized from reviewing publications of school health and survey data from trainees for principals of primary and middle school at Korea National University of Education during Jun. 17 to Aug. 13, 1987. The major recommandations for the improvement of school health program in Korea of this study are as follow: 1. Reformation of School Health Organization It is hard to activate effective school health program without reformation of school health organization in the Ministry of Education. School health section in MOE should be reorganized for the planning, operation and evaluation of school health program. School health committee in MOE and Provincial Board of Education should be established by the health and education professions. 2. Appointment of school physician and recruitment of school nurse: School health center in Office of City/Gun Education should be established for increasing the utilization of school physician, and school nurse should be appointed for 3 - 4 schools in same area. 3. Improvement of school health education: 1) Curricula of physical education of teachers College/University should be rearrangement for school health education. 2) Role of school nurse as a health educator in school should be extented. 3) In-service training for health education should be done for teachers of physical education. 4) Professional health teacher should be trained independently from physical education in College of Education and Teachers College. 4. Revision of school health law and regulations: Present school health law and regulations should be revised by the recommendations of experts on school health.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.4
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• pp.368-374
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• 2008

The basic Trainer Aircraft of The Korean Air force KT-1/KO-1, which was designed and developed by Korean Technology has been a primary candidate as a replacement for the aging basic trainer or armed version for surface support operation for the nations such as Mexico, Philippine, Turkey, Venezuela and etc. In this study, competitors for the same class aircraft and the present operational status of the basic trainer of the world were identified and the fade out periods were also predicted. The result of this market analysis showed the required number of aircraft by the year 2025 for 33 countries as 4500. The exportable number of KT-1 aircraft was predicted considering the political/diplomatical environments, economic environment and also by the ability of producing same class aircraft of the country.

• Information Systems Review
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• v.10 no.2
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• pp.253-267
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• 2008

As the importance of information security becomes a major concern, there has been growing effort to educate information security professionals. This study aims to analyze the level of required knowledge and skills for four information security skills groups: strategy and planning; research and development; system management and operation; and accident control. For this study, we selected 55 critical knowledge and skills for information security professionals by literature review and Delphi method, and we conducted a survey of information security knowledge and skills requirements for information security professionals to perform their jobs. As a result, we analyzed the current status of the information security professionals' knowledge and skills level and suggested some guidelines for establishing the demand-based curriculum for training information security professionals.

• Journal of Korea Society of Industrial Information Systems
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• v.19 no.3
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• pp.31-39
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• 2014

In KSLV-I launch mission, real-time data from the tracking stations are acquired, processed and distributed by the Mission Control System to the user group who needed to monitor processed data for safety and flight monitoring purposes. The processed trajectory data by the mission control system is sent to each tracking system for target designation in case of tracking failure. Also, the processed data are used for decision making for flight termination when anomalies occur during flight of the launch vehicle. In this paper, we propose the processing mechanism of slaving data which plays a key role of launch vehicle tracking mission. The best position data is selected by predefined logic and current status after every available position data are acquired and pre-processed. And, the slaving data is distributed to each tracking stations through time delay is compensated by extrapolation. For the accurate processing, operation timing of every procesing modules are triggered by time-tick signal(25ms period) which is driven from UTC(Universial Time Coordinates) time. To evaluate the proposed method, we compared slaving data to the position data which received by tracking radar. The experiments show the average difference value is below 0.01 degree.

• Archives of design research
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• v.20
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• pp.265-276
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• 1997

I intend to grope for the desirable outdoor color environment creation plan through researching situation of our apartment houses color environment and grasping the point at issue. The rearch was made that Ilsan(16 items) new city apartment were selected and the color seperately measured such as the dominant, the aid, the accent colors through applied color component ratio was researched by calculating square measure of matched colors and through that the evaluation of apartment complex color environment was formed. The planned construction problems were issued from comparing the planned scheme and the present carrying color status guide by investigating the color plan applied Ilsan new city. The current out apartment outdoor color environment is poor, and the color plan of the early stage has many insufficient parts and many operation errors. For the creation of desirable color environment, the color plan establishment by regional characteristics, the color environment management, though exhaustive color consultation, and the external construction technique improvement, the standard color sheet diffusion, the color understanding of architects, the public relations (P.R), the education on the importance of color are required.

• The Journal of the Korea Contents Association
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• v.17 no.4
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• pp.119-131
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• 2017

The recent cultural properties utilization projects by the Cultural Heritage Administration have no rational standards to pay reasonable prices to stakeholders participating in budget compilation or projects. Therefore, there are frequent conflicts when calculating budgets between the Cultural Heritage Administration supervising projects and local governments or private organizations. Especially, as the items or detailed standard of budget compilation from planning to completion of projects are unclear, it is hard to stably operate projects, and eventually, they are no more than one-shot events without being developed into long-term projects. Thus, this study analyzes the overall operational status, systems, and problems of current cultural properties utilization projects. A national-level budget compilation standard system is then suggested, for the stable operation of cultural properties utilization projects. In addition, this study benchmarks the items and detailed standard of budget compilation used in similar areas, and also puts together actual cases.

• Journal of Satellite, Information and Communications
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• v.12 no.4
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• pp.95-99
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• 2017

The lifetime of a battery that supplies all the power required by a satellite in the eclipse is directly related to the lifetime of the satellite. Because the lifetime of the battery is influenced by the charging method of the battery, the power control unit that controls the charging of the battery should be designed in consideration of battery life. The battery charging is performed by controlling the charge current in the power control unit generated from the solar cell in the daytime. In order to prevent overcharge of the battery and for considering frequency of eclipse in each season, parameters related battery charging should be designed differently according to the season and to prevent over-current charging and over-voltage charging during charging, charge current is controlled by monitoring battery charge / discharge status, charge current amount, battery voltage, battery capacity, battery temperature and battery cell voltage. In satellite, tapering method is used to control charge current by reflecting each condition. In this paper, design battery charging algorithm of satellite power control unit using tapering charging method. convert the designed algorithm into a code that can be uploaded to satellites and verify the operation through testing in the established satellite environment.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.9
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• pp.70-77
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• 2006

We have fabricated an integrated three-phase flux-lock type SFCL, which consists of an YBCO($YB_a2Cu_3O_7$) thin film and a flux-lock reactor wound around an iron core of each phase. In order to apply the SFCL in a real power system, fault analyses for the three-phase system are essential. The short-circuit currents were effectively limited by adjusting the numbers of winding of each secondary coil and their winding directions. The flux flow generated in the iron core cancelled out under the normal operation due to the parallel connection between primary and secondary windings. However, the flux-lock type SFCL with same iron core was operated just after the fault due to the flux generating in the iron core. To analyze the current limiting characteristics, the additive polarity winding was compared with the subtractive one in the flux lock reactor. Whenever a single line-to-ground fault occurred in any phase, the peak value of the line current of the fault phase in the additive polarity winding increased up to about 12.87 times during the first-half cycle. On the other hand, the peak value in the subtractive polarity winding increased up to about 34.07 times under the same conditions. This is because the current flow between the primary and the secondary windings changed to additive or subtractive status according to the winding direction. We confirmed that the current limiting behavior in the additive polarity winding was more effective for a single-line-to-ground fault