• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.47-54
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• 2015

The most important function in distribution automation system (DAS) is the service restoration. KEPCO's current service restoration provides a very effective restoration service. However, it has been developed without the consideration of unexpected abnormal conditions that may occur while processing the sequence of switching operations. The objective of this paper is to provide practical service restoration schemes under consideration of abnormal conditions. The proposed service restoration schemes have been integrated to a branch office (B/O) in KEPCO. The proposed method strongly supports the conventional service restoration and adds to its value.

• Journal of the Korea Society of Computer and Information
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• v.21 no.1
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• pp.155-160
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• 2016

This study aims to develop strategies to reinforce the roles of universities and volunteer service activities centering on promotion of their connections to communities and community-oriented volunteer service activities. First, for autonomous and continuing development of volunteer services, universities should have active connections with service organizations. Second, more specialized volunteer service programs should be developed. Third, as volunteer service activities are somewhat forced on college students, recognition for them should be improved. Fourth, as the quality of the service and academic achievement decrease, conditions for volunteer service education and programs should be made available. Fifth, for continuing participation in volunteer service activities, organized systems should be established.

• Proceedings of the KIEE Conference
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• 2004.11a
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• pp.248-250
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• 2004

We have investigated the surface state of 154kV polymeric insulators exposed to in-service conditions for about five years. In order to evaluate surface aging of silicone rubber exposed to real field environments, we used various analytic methods such as contact angle, ATR-FTIR, SEM-EDS. Although contaminants were accumulated on weathershed surface, polymeric insulator has retained its intrinsic surface hydrophocity. In addition, ATR-FTIR confirmed the diffusion layer of a low molecular weight silicone fluid on surface layer and no surface cracking and chalking were Indicated by SEM. Polymeric insulators have still retained their improved pollution performance over porcelain insulators. That will lead to very low frequency of flashovers throughout their useful life, often under contaminated conditions.

• Annals of Clinical Neurophysiology
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• v.25 no.2
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• pp.78-83
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• 2023

Nociplastic pain refers to pain arising from altered nociception without evidence of tissue or somatosensory damage. It encompasses various clinical conditions with shared neurophysiological mechanisms involving different organ systems. Nociplastic pain can occur independently or alongside chronic pain conditions with a nociceptive or neuropathic origin. This review introduces the concept of nociplastic pain, its clinical manifestations and the underlying pathophysiology. Taking a biopsychosocial approach can lead to a better understanding of nociplastic pain and improved treatment outcomes for affected individuals.

• International Journal of Highway Engineering
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• v.17 no.4
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• pp.107-115
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• 2015

PURPOSES: This study analyzes the characteristics of traffic flow on freeway sections under daytime and nighttime conditions to improve traffic safety, and suggests a method to estimate an accurate freeway capacity value that reflects these characteristics. METHODS : The trends and differences in capacity were investigated using comprehensive field data collected under both daytime and nighttime conditions on freeway sections with designated speeds of 80, 100, and 120 kph. RESULTS : The capacity values under nighttime driving conditions were reduced by 3.3%, 6.9%, and 8.8% at 80, 100, and 120 kph, respectively. Several nighttime adjustment factors were deduced for each designated speed category from the analysis results. CONCLUSIONS : It is expected that more accurate capacity values can be estimated for freeway sections under nighttime conditions by applying the resulting adjustment factors. In addition, traffic safety will be improved through the increased efficiency of traffic management on these freeway sections.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.33 no.4
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• pp.28-37
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• 2010

In this study, services for promoting health were provided to kindergarten children. As u-Health services for children, services centered of positioning of children are provided. However, since problems related with obesity and mental health are increasing day by day due to westernized eating habits, the necessity of physical and mental health care for children is on the rise. Considering this state, in this study, experiments of u-Health services under the concept of wellness were conducted on kindergarten children. For physical health, the children's obesity was controlled and for mental health, services of diagnosing hyperactivity disorder which is a sub symptom of ADHD were provided. Based on the results, it could be identified that parents' satisfaction and children's health conditions were improved.

• Journal of Families and Better Life
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• v.28 no.1
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• pp.51-67
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• 2010

This study looked into the current conditions in Korean and Japanese care management for the elderly, cases of consumer counseling in these countries, and the supporting institutions for Japanese users regarding the use of care management for the elderly. The number of recipients of care management for the elderly in both Korea and Japan is growing every year, and more Japanese users receive various services compared to Korean users. The results of an analysis on consumer counseling regarding the use of Korean and Japanese care management revealed, two types of complaints: counseling for the improvement of the institution and complaints related to the procurement of service. Regarding the insurance system, the complaints were mostly related to affirmation of a rating and the burden incurred by cost-sharing. Regarding the use of service, such key impairment cases were related to in-service medical accidents, illegal acts including caregiver contract violations and forced retirement, careless service by workers, and human rights violations of the elderly. Japan has developed governmental and, related-administrative and business services as well as a local governmental system to redress customer impairment issues as this pertains to service for better quality care management. In addition, they have enlarged the locally closed service, provided exact information about the services offered, and improved service appraisal techniques. The Japanese cases will serve as a good reference to improve the Korean system. In particular, the construction of a system that reduces customer losses and the availability of more counseling information are urgently required to improve the system in terms of customer experiences when they seek care management.

• Journal of Korean Society of Rural Planning
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• v.16 no.3
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• pp.131-141
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• 2010

As a basic life-supporting infra in modem life, road should carry out various functions; transport, public linear network service, open activity space. Case study villages were divided into plan-based improved one(3 subtypes) and not one(4 subtypes). On total 21 case study villages($3{\times}7$ subtypes), questionnaire surveys were performed. Villagers' satisfaction level to road conditions in the plan-based improved villages showed much higher than not improved ones, which means that improvement of village roads be a vital subject in level-up of quality of rural life. Traffic function of village roads was responded as a principal one, while other various functions as between-villagers communication, car-parking and accommodation of public utilities were also required. In this viewpoint, village roads should be multi-purposedly developed in future. So, it was concluded that the road improvement strength would vary with geographical and topographical conditions of each village. Although villagers' unsatisfaction level on road service was very high, their demand level of and supporting will toward road improvement works have continuously increased, so, it would be considered to be the very time that full-fledged village road improvement policy be initiated.

• Journal of Electrical Engineering and Technology
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• v.10 no.2
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• pp.452-464
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• 2015

This paper proposes a DC microgrid operational strategy and control method for improved service reliability. The objective is to supply power to as many non-critical loads as possible, while providing an uninterrupted power supply to critical loads. The DC bus signaling method, in which DC voltage is an information carrier, is employed to implement the operational strategy in a decentralized manner. During grid-connected operation, a grid-tied converter balances the power of the microgrid by controlling the DC voltage. All loads are connected to the microgrid, and operate normally. During islanded operation, distributed generators (DGs), a backup generator, or an energy storage system balances the power. However, some non-critical loads may be disconnected from the microgrid to ensure the uninterrupted power supply to critical loads. For enhanced service reliability, disconnected loads can be automatically reconnected if certain conditions are satisfied. Control rules are proposed for all devices, and detailed microgrid operational modes and transition conditions are then discussed. Additionally, methods to determine control parameter settings are proposed. PSCAD/EMTDC simulation results demonstrate the performance and effectiveness of the proposed operational strategy and control method.

• Journal of Convergence for Information Technology
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• v.11 no.5
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• pp.23-29
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• 2021

Recently, a situation in which a specific content service is impossible worldwide has occurred due to a failure of the platform service and a significant social and economic problem has been caused in the global service market. In order to secure the stability of platform services, intelligent platform operation management is required. In this study, big data flow management(BDFM) and implementation method were proposed to quickly detect to abnormal service status in the platform operation environment. As a result of analyzing, BDFM technique improved the characteristics of abnormal failure detection by more than 30% compared to the traditional NMS. The big data flow management method has the advantage of being able to quickly detect platform system failures and abnormal service conditions, and it is expected that when connected with AI-based technology, platform management is performed intelligently and the ability to prevent and preserve failures can be greatly improved.