• Title/Summary/Keyword: Out of distribution

Search Result 8,341, Processing Time 0.039 seconds

Electrical Characteristics of ZnO Blocks by a Lightning Impulse Current and the Expert System to Diagnose Arrester Deterioration (뇌충격전류에 의한 산화아연형 피뢰기 소자의 전기적 특성과 피뢰기 열화진단 전문가 시스템)

  • Gil, Gyeong-Seok;Han, Ju-Seop;Song, Jae-Yong;Kim, Myeong-Jin;Kim, Jeong-Bae;Jo, Han-Gu
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.51 no.4
    • /
    • pp.152-157
    • /
    • 2002
  • This paper describes an effect of a single- and a quadruple-lightning impulse currents on electrical characteristics of ZnO blocks, and an expert system to diagnose arrestor deterioration. To deduce the parameters needed for diagnosing arrester deterioration, an accelerate deterioration teat is carried out. In the experiment, leakage current components are measured. Also, wave height distribution of the leakage current according to the progress of arrester deterioration is analyzed. From the experimental results, the wave height distribution of the leakage current showed conspicuous difference even in an immaterial leakage current increase. Therefore, the use of wave height distribution of the leakage current in deterioration diagnostic technique makes more accurate diagnosis than the conventional method by using only a leakage currant value. Finally, the expert system based on the experimental results is developed and the system can diagnose arrestor deterioration by measuring the leakage current and its wade height distribution.

How Research in Sustainable Energy Supply Chain Distribution Is Evolving: Bibliometric Review

  • KIPROP NGETICH, Brian;NURYAKIN, Nuryakin;QAMARI, Ika Nurul
    • Journal of Distribution Science
    • /
    • v.20 no.7
    • /
    • pp.47-56
    • /
    • 2022
  • Purpose: As the need to transition into the distribution of cleaner energy has garnered corporate and scholarly interests, this study aims to track the research trends in sustainable energy supply chains for five years before 2021. Research methodology: This study was conducted by a bibliometric literature review and analysis to map the field's evolution between 2016 and 2020. Out of an initial title search result of 2,484 papers from the Scopus engine, filtering led to 180 documents obtained. The data was exported in excel format (CSV) to VOSviewer software to generate and analyze network visualization of sustainable energy supply chain trends. Results: The results revealed China's the highest publishing country, with 36 research papers. The Journal of Cleaner Production was the top publishing source, with 22 papers per year. These findings showed five clusters formed in the bibliographic coupling of countries. Circular Economy and Green Supply Chain Management represent the current hot topics. Research gaps identified in the field included limited cross-industry testing and modifying sustainable supply chain models. Conclusion: This paper contributes to the sustainability literature on supply chains by providing an overview of trends and research directions for scholars' and practitioners' consideration in future research.

An Analysis of Patients distribution Rescued or Tansported by Fire Service Department Helicopter at the KangWonDo Region, KOREA (강원도 지역에서의 소방헬기에 의한 이송환자 분석)

  • Lee, Kyoung-Hee
    • The Korean Journal of Emergency Medical Services
    • /
    • v.6 no.1
    • /
    • pp.55-64
    • /
    • 2002
  • This analysis is accomplished by using 331 rescue and medical evacuation cases performed by KangWonDo Fire Service Department Aviation(KFSA-119 Heicopters) between Jan. 1998 and Oct. 2002. By analysing injury causes, annual differences, sexual, scenic(locaional) distribution and wounded part distribution, this study tried to figure out the general tendency of the helicopter-transported patients in Korea. The results are as follows; 1. The whole population of the patients rescued and transported by helicopters is increasing by the annual rate of 150%~200%. 2. For the locational (scenic) distribution of the patients, 57% (190 cases) of the target population were injured on their mountain-climbing or tracking. 3. 12% (41 cases) of the target population were the Inter-Hospital transport cases. 4. 6% (16 cases) were the expired cases. 5. for the wounded part distribution, 46% (106 cases) were muscular skeletal injuries. 6. The aircraft and personnel of the KFSA were rescue-oriented, so for the EMS operations especially inter-hospital transport missions, different medical equipments and personnels are needed.

  • PDF

The Design and Performance Test of Mold Transformer for Outdoor Pole (50 kVA 주상용 몰드변압기의 설계 및 특성평가)

  • Cho, Han-Goo;Lee, Un-Yong;HwangBo, Kuk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2002.05c
    • /
    • pp.132-137
    • /
    • 2002
  • The mold transformers have been widely used in underground substations in large building and have some advantages in comparison to oil-transformer, that is low fire risk, excellent environmental compatibility, compact size and high reliability. In addition, the application of mold transformer for outdoor is possible due to development of epoxy resin. The mold transformer generally has cooling duct between low voltage coil and high voltage coil. A mold transformer made by one body molding method has been developed for small size and low loss. The life of transformer is significantly dependent on the thermal behavior in windings. To analyse winding temperature rise, many transformer designer have calculated temperature distribution and hot spot point by finite element method(FEM). Recently, numerical analyses of transformer are studied for optimum design, that is electric field analysis, magnetic field, potential vibration, thermal distribution and thermal stress. In this paper, the temperature distribution of 50 kVA pole mold transformer for power distribution are investigated by FEM program and the temperature rise test of designed mold transformer carried out and test result is analyzed compare to simulation data. In this result, the designed mold transformer is satisfied to limit value of temperature and the other property is good such as voltage ratio, winding resistance, no-load loss, load loss, impedance voltage and percent regulation.

  • PDF

Suitability Evaluation on Joint Operation of Neutral Wire and Overhead Grounding Wire through Lightning Surge Analysis in Combined Distribution System (혼합배전계통에서 뇌과전압 해석을 통한 중성선과 가공지선 혼용 운전의 타당성 평가)

  • Jeong, Seok-San;Lee, Jong-Beom;Kim, Yong-Kap;Song, Il-Keun;Kim, Byoung-Suk
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.59 no.12
    • /
    • pp.2135-2142
    • /
    • 2010
  • This paper studies the validity about a joint operation of neutral wire and overhead grounding wire in combined distribution systems. The overhead grounding wire and neutral wire are currently installed separately and grounded by common. However there is no any ineffectiveness or electrical problem in case of the proposed system, such system can be operated at real distribution system. Therefore this paper describes the suitability of a joint operation through lightning surge analysis on combined distribution systems. Lightning surge analysis is carried out by EMTP/ATPDraw to obtain the overvoltage of overhead line and underground cable in various conditions such as locations and current types of lightning stroke. Overvoltage gained by the analysis show that the insulation strength of the joint operation case is not stable compare with the current operation case.

Implementation of a Photovoltaic System Simulator for Interconnecting with Bipolar ±750V DC distribution Grid (바이폴 ±750 직류 배전망 연계용 태양광 발전 시뮬레이터 구현)

  • Kim, Tae-Hoon;Kim, Seok-Woong;Cho, Jin-Tae;Kim, Ju-Yong;Jung, Jae-Seung
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.11
    • /
    • pp.1800-1805
    • /
    • 2016
  • The micro-grid designed as bipolar ${\pm}750V$ low-voltage DC power distribution system demonstrated by KEPRI, demands interconnection of a number of small decentralized power source including variable renewable generator. Therefore, variable researches for the influence of interconnection with the bipolar typed DC grid and these variable power sources are required for superior quality of power distribution. Renewable power generation simulators for the bipolar ${\pm}750V$ low-voltage DC power distribution system are necessary for such researches. In this paper, we carry out a research on the photovoltaic simulator that be actually able to interconnect with a bipolar ${\pm}750V$ low-voltage micro-grid. Simulator for this research is not only able to simulate photovoltaic generation according to weather informations and PV modules characteristics, but also contribute to stabilization of bipolar ${\pm}750V$ low-voltage of the system. Therefore, the simulator was designed to develop a system that can situationally respond to variable control algorithms such as the MPPT control, droop control, EMS power control, etc.

Analysis and Pattern Deduction of Actual Electric Vehicle Charging Data (실데이터 기반의 전기자동차 충전 데이터 분석 및 충전 패턴 도출)

  • Kim, Jun-Hyeok;Moon, Sang-Keun;Lee, Byung-Sung;Seo, In-Jin;Kim, Chul-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.67 no.11
    • /
    • pp.1455-1462
    • /
    • 2018
  • As the interests in eco-friendly energy has increased, the interests in Electric Vehicles(EVs) are increasing as well. Moreover, due to the government's economic support for EVs, penetration level of it has rapidly increased. These sharp increases, however, induce various problems in distribution system, such as voltage/frequency variations, peak demand increasement, demand control, etc. To minimize these possible matters, lots of research have conducted. Nevertheless, most of it assumed extremely important factors, such as numbers and charging patterns of EVs. It inevitably results in errors in their research, and thus make it difficult to prevent the possible matters from EVs. In this paper, therefore, we use actual EVs charging data from KEPCO, and analysis and deduction of it were conducted. The simulations were carried out for four aspect(season, region, purpose).

A Study on the Reduction of Import and Export Distribution Costs for Agricultural Products by Creating a Compound Logistics Complex (복합물류단지 조성에 따른 농산물 수출입 물류비용 절감에 관한 연구)

  • Kim, Byeong Chan
    • Journal of Korea Society of Digital Industry and Information Management
    • /
    • v.10 no.3
    • /
    • pp.273-283
    • /
    • 2014
  • Imported and exported agricultural products are facing a very difficult time due to the rising distribution costs spurred by the increasing labor and oil prices. High empty transfer rates, which take place on a return route after the regular transportation of imported and exported agricultural products, are especially a major cause of the rising distribution costs. In an effort to overcome those limitations, this study set out to examine the transportation stages connecting harbor warehouses, processing plants, and central distribution centers on the circulation route of such imported grains as wheat, barley, corn, and soybean and the transportation route from the warehouses devoted to exported agricultural products to harbors for such exported agricultural products as apple, pear, and persimmon in order to develop a model on the creation of a compound logistics complex for processing plants and transshipment of imported and exported agricultural products. The study also promoted the logistic rationalization of imported and exported agricultural products by creating a compound logistics complex that would combine processing plants for imported agricultural products and transshipment functions for exported agricultural products.

Analysis of the Residence Time Distribution for a Variable Feed Rate System by the State-space Equation (가변 유입유량 공정시스템에 대한 상태방정식을 이용한 체재시간분포 해석)

  • Moon, Jinho;Jung, Sung-Hee;Kim, Jong-Bum
    • Journal of Radiation Industry
    • /
    • v.4 no.1
    • /
    • pp.85-89
    • /
    • 2010
  • The radioactive experiments are carried out for diagnosis of a variety of industrial processes in terms of the operation condition and the efficiency by measuring the residence time distribution. However, it is not easy to interpret the residence time distribution using the conventional methods when the flow rate is not constant and a number of processes are coupled in a complicated manner. In these cases, they can be analyzed by describing the system with mathematical models that can be defined with the state-space equations. In this paper, the residence time distribution of sludge was measured with a radiotracer, $^{46}Sc-EDTA$, in the digester of which the flow rate varies with time. The digester was assumed as a linear time variant system since the flow rate changed during the experiment and the operation efficiency of the digester was calculated by applying the state-spae equations.

Distribution of Factors Affecting Foreign Direct Investment in ASEAN Countries

  • Anh Thi Lan, NGUYEN;Chau Thi Minh, PHAM;Hanh Hong, NGUYEN;Dat Ngoc, NGUYEN;Duy Van, NGUYEN
    • Journal of Distribution Science
    • /
    • v.21 no.2
    • /
    • pp.1-6
    • /
    • 2023
  • Purpose: Research on attracting foreign direct investment plays an important role in ASEAN countries. ASEAN has needed FDI capital for development and integration with many developing countries. Research design, data and methodology: This study is conducted to assess the impact of factors: inflation (INF), economic growth (GDP), population (POP), and trade (TRADE) on attracting foreign direct investment (FDI) of ASEAN countries. The study will find out how factors distribution contributes to FDI attraction. The study collects data from 10 ASEAN countries from 2010 to 2020. With data collected for ten countries from 2010 to 2020, data analysis with panel data will be used in this study. The Regression with Driscoll-Kraay standard errors correction model will be used in the study. Results: Panel data analysis shows that economic growth and population positively impact FDI attraction in ASEAN countries. However, two factors: INF and TRADE, do not affect FDI. Conclusions: Countries need to focus on economic development, create many good conditions for people and domestic enterprises and create opportunities for foreign investors to pay more attention. improving the quality of domestic human resources will help to better improve the working quality factor when the demand for high-quality human resources increases.