• Journal of Information Processing Systems
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• 제19권3호
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• pp.302-309
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• 2023

Artificial intelligence (AI) plays a crucial role in the intelligent development of China's power system. It is also an important part of the digital development of the power grid. The development of AI determines whether the digital transformation of China's power system can be successfully implemented. Therefore, this paper discusses the digital transformation of the power grid based on AI technologies. The author has established a digital evaluation index system to reflect the development of the power grid in one province. Both qualitative and quantitative methods have been adopted in the analysis, which delves into the economic effectiveness, quality, and coordination of power grid development in the province in a comprehensive way. Results show that, to meet the needs of the power grid's digital transformation, the correlation coefficient between the power grid's development and the province's overall coordination has been increasing in recent years.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.29-31
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• 2006

The most crucial requirement of a power system is o supply quality electric energy to customers without interrution. This problem is directly related to reliability of power system. Reliability assessment of power system has been an important topic for the past several decades. This paper deals with reliability assessment of a 154kV power substation n KEPCO. In his paper, exponential distribution is used to calculate reliablity index. The failure rate data that are utilited for reliablity index based on the realistic system. Also, FTA(Fault Tree Analysis) is used to compute substation reliablity

• 디지털융복합연구
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• 제12권6호
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• pp.55-68
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• 2014

본 연구에서는 문화력이 국력요소인 소프트파워에 어떤 영향을 미치고 있는지를 경험적 연구를 통해 살펴보았다. 문화력을 발휘하기 위해서는 문화적 국력요소에 대한 적절한 수준의 자원을 가지고 있어야 하고, 이의 활용을 통해 자원이 필요할 때 필요한 질과 양만큼 개발 생산하여 확보할 수 있는 역량을 갖추고 있어야 하며, 그런 자원들을 개발 생산, 확보하는 제반주체들의 활동이 원활히 발휘되도록 돕는 제반지원능력, 즉 복합지원역량으로 나타나야 한다. 문화력의 지표는 국민호감도, 문화호감도, 문화산업 경쟁력 지수, 체육경쟁력 지수, 관광 경쟁력 지수 등을 포함한다. 각 국가들의 문화력을 분석한 결과, 각 국가들의 문화산업 경쟁력과 여행 및 관광 경쟁력의 요소들이 비교적 높은 상관관계를 나타내었다. 따라서 본 연구에서는 '소프트파워로서의 문화력' 부문에서 한국 중국 미국 간 문화산업과 여행 및 관광 경쟁력 측면에서 요소 지표를 분석하여보고 문화차이 등 자원의 발휘를 고찰하였다.

• 산업경영시스템학회지
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• 제44권3호
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• pp.50-63
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• 2021

There has been a steady rate of accident in Coal Thermal Power Plants which have relatively higher chance of mortality. However, neither the systematic view of safety management nor the methodology such as safety factors or system requirements are yet to be studied in detail. Therefore, this study aims to propose a methodology to preemptively deal with safety issues and to secure fact focused responsibility in safety. It consists of two main parts. First, the Safety Measurement Index(SMI) with total 50 factors is proposed by analyzing the key factors that contribute to safety accidents based on failure mode and effect analysis (FMEA) and quality function deployment (QFD). To analyze the safety requirements, index presented by major countries and organizations are discussed. Second, main features of intelligent CCTV are studied to determine their relative importance for the framework of Smart Safety Management System (SSMS). Main features are discussed with four technological steps. Also, QFD was held to analyze to analyze how key technologies deal with Quality Measurement Index(QMI). The research results of this study reveal that scientific approaches could be utilized in integrating CCTV technologies into a smart safety management system in the era of Industry 4.0. Moreover, this reasearch provides an specific approach or methodology for dealing with safety management in Coal Thermal Power Plant.

• 대한산업공학회지
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• 제5권1호
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• pp.19-25
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• 1979

This paper presents an analysis of the contents of job for the sensory inspection on the basis of the probability theory, and the new determination for an index(d') of the testing power precision in carrying out sensory inspections. Also presented are the evaluation method of determining the ability of inspector by presuming the confidence interval for the average record of inspector, and the computation method for the index (de') of the testing power precision required as the goal-value in accordance with quality character, process inferior ratio, and required AOQ.

• 한국소음진동공학회논문집
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• 제24권2호
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• pp.108-116
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• 2014

With the increasing the importance of emotional quality of vehicle, the sound quality of systems with electric motor components has become increasingly important. Electric motors are used for windows, seats, sun roof, mirrors, steering columns, windshield wiper and climate control blowers, etc. In this paper, a study was conducted to identify sound quality factors that contribute to customer's satisfaction and preference of the window lift system. Jury test for subjective evaluation was carried out and sound quality index was developed. Averaged sound pressure level and sharpness were significant factors when glass moves down. Also, maximum loudness at stop section and averaged loudness were significant factor when glass moves up. Next, noise source identification was carried out using beam forming method during glass transferred section and impulsive noise at stop section. Several improvement methods were applied using the source identification result. And finally, the degree of sound quality improvement was judged using sound quality index.

• Journal of Electrical Engineering and Technology
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• 제1권2호
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• pp.153-160
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• 2006

This paper presents a new compensating system, which consists of a shunt active filter and passive components for mitigating voltage and current disturbances arising from an Electric Arc Furnace (EAF). A novel control strategy is presented for the shunt active filter. An extended method based on instantaneous power theory in a rotating reference frame is developed for extraction of compensating signals. Since voltages at the point of common coupling contain low frequency interharmonics, conventional methods cannot be used for dc voltage regulation. Therefore, a new method is introduced for this purpose. The passive components limit the fast variations of load currents and mitigate voltage notching at the Point of Common Coupling (PCC). A three-phase electric arc furnace model is used to show power quality improvement through reactive power and harmonic compensation by a shunt active filter using the proposed control method. The system performance is investigated by simulation, which shows improvement in power quality indices such as flicker severity index.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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• pp.54-56
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• 2003

With the advancement of superconductor materials, especially in HTC YBCO(Gen II), the feasibility of SMES in power systems become much higher than previous days application[1]. Also, with the de-regulation of electricity market, it is indispensable to have a proper estimation of power quality index and power quality cost calcluation mechanism to stabilize highly industrialized society and to vitalize the investment for electric power system. This paper suggests a comprehensive algorithm[2] to determine the policy of SMES investment with the PQ Indices[3] based on aggregated load CBEMA curve reflecting the voltage characteristics such as volatge sags and interruptions which make electric load in unstable operation.

• Journal of Electrical Engineering and Technology
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• 제9권1호
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• pp.6-14
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• 2014

A new method to determine the total harmonic contributions of several customers and the utility at the point of common coupling is presented. The proposed method can quantify the individual harmonic impact of each suspicious harmonic source at the point of common coupling. The individual harmonic impact index is then used to assess the total harmonic contribution of each harmonic source. This index can be calculated by the results processed from instantaneous harmonic voltage and current phasor values. The results demonstrate the performance of the proposed method in terms of steady-state accuracy and response to time-varying operating conditions. The proposed index can be used for billing purposes to control harmonic distortion levels in power systems.

• 한국작물학회지
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• 제48권3호
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• pp.184-190
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• 2003

국산 맥주보리의 품질향상을 위한 육종을 도모하기 위하여 농촌진흥청 영남농업시험장에서 보유하고 있는 맥주보리 유전자원 59품종 및 계통을 중심으로 원맥 및 맥아의 품질분석을 실시하여 품질이 우수한 자원을 선발하여 품질향상을 위한 육종소재로 이용할 목적으로 수행하였다. 1. 원맥의 단백질함량은 평균 12.3% (10.7-14.9%)를 나타내었으며, $\beta$-글루캔함량은 3.5-5.8%로 평균 4.6%였다. 2. 맥아신장도, 불발아율, Friability, 여과시간, 맥즙추출율, 콜박지수 및 효소력가는 품종간 유의 차가 인정되었으나, 그 밖의 형질은 차이가 없었다. 3. 15개 품질관련 형질간의 상관분석 결과, 원맥의 단백질 함량이 높을수록 맥아 단백질($0.800^{**}$)은 상대적으로 증가하지만, 당도(-$-0.578^{**}$). Friability($-0.554^{**}$), 맥즙추출율($-0.592^{**}$) 및 콜박지수($-0.681^{**}$)등은 낮아져 품질을 저하시키는 고도의 부의 상관이 인정되었다. 4. 맥아의 단백질함량이 높아짐에 따라서 추출을($-0.774^{**}$)과 콜박지수($-0.778^{**}$)가 현저하게 감소되는 등 품질저하의 원인이 되었다. 5. 본시험에서 추출율이 80% 이상이면서 콜박지수 및 효소력가 등 종합적으로 품질이 우수한 품종 및 계통은 외국품종으로서 Viva, Nishino chikara, Kinukei 9 및 Kinukei 12 의 4품종 및 계통과 국내육성 품종으로서 사천6호와 진양보리였다