• Title/Summary/Keyword: Remedial Action Analysis

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A Study on Methodology for Automated Contingency and Remedial Action Analysis based on Practical Approach: Development of Automated Scheduled Outage Analysis Tool (실용적 접근 기반의 전력계통 해석 프로그램 상정고장, 해소방안 자동화 기법: 휴전검토 자동화 툴 개발)

  • Song, Jiyoung;Ko, Baekkyung;Shin, Jeonghoon;Han, Sangwook;Nam, Suchul;Lee, Jaegul;Kim, Taekyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.9
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    • pp.1171-1179
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    • 2014
  • ISO(Independent System Operator) or TSO(Transmission System Operator) use power system analysis program to simulate contingency analysis and remedial actions to operate power system stably. Generally, power system analysis program provides automated analysis functions(or modules) to deal with wide area power system. However, because of missed contingency cases, automated contingency analysis has no practical use or has limitation. And in case of remedial action, it doesn't support automated function or takes a lot of times to study, because of simulation in manual for each cases. This paper suggests that new relation with buses and transmission line properties of power system DB used for power system analysis program to simulate automated contingency including all contingency cases needed in the field without missed cases. And it proposes automated remedial action scheme based on practical approach analysis to alleviate overloading or voltage problems. Finally it deals with automated contingency/remedial action analysis(automated scheduled outage) program which is developed by KEPCO and its performance and proposed schemes are proven by case study for real Korean power system data.

Consumer Post-Purchasing Behavior of Internet Shopping - Focusing on Dissatisfaction and Complaint Behavior - (의류제품의 인터넷 구매 후 행동에 관한 연구 - 불만족 요인과 불평 행동을 중심으로 -)

  • Park, Soo-Kyeong;Cho, Nam-Hae
    • The Research Journal of the Costume Culture
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    • v.18 no.2
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    • pp.217-228
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    • 2010
  • The purpose of this study was to examine the post-purchasing behavior focusing on dissatisfaction and complaint behavior. There were some studies concerning dissatisfaction in on-line shopping related to satisfaction and intention to re-buying, but did not focus the relationship with complaint behavior, or identified the factors specifically related to consumer's dissatisfaction. In this study, it was examined to minimize the consumer's dissatisfaction and complaint behavior by investigating the detailed factors relating dissatisfactions and complaint behaviors after shopping apparel goods on the internet. Two hundred fifty five customers who had purchased fashion products in internet shopping had participated in this study. The data was analyzed by factor analysis, regression analysis using SPSS program. As the result, first, product, delivery, returning and price factor were extracted as factors of dissatisfaction, and as factors of complaint behavior, legal action, private action, remedial action were investigated. Second, dissatisfaction was significantly effected on complaint behavior. Specially, returning factor and price factor had effect on legal action, product, delivery factor had on private action and returning factor had affected remedial action. Third, more purchasing frequency, less dissatisfaction. Also, female had more dissatisfaction than male. Finally, more dissatisfaction and compliant behavior, less repurchasing intention. Based on these results, internet shopping fashion marketing strategies were suggested.

The Study of Microbial Population & Dynamics in Hydrocarbon Contaminated Areas (유류오염지역의 미생물 분포 및 활성도에 관한 연구)

  • 김무훈;김순기;이원권;경우성;박덕신
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 1999.10a
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    • pp.28-31
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    • 1999
  • The purpose of this study is to see the effect of microbial population and dynamics of the indigeonous microorganisms on hydrocarbon contaminated areas. The microbial structures and activities to determine the microbial capabilities of the contaminated sites are very important for the remedial action technology selection. Throughout microbial studies on different conditions by ETS(Electron Transport System) and microbial activity analysis, it was found that aeration and water contents are the most important factors in this site remediation. According to test results, Burkholderia spp. was dominant species, and acclimation is also an important factor for the accerelated biodegradation.

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SOURCES OF HIGH LEVERAGE IN LINEAR REGRESSION MODEL

  • Kim, Myung-Geun
    • Journal of applied mathematics & informatics
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    • v.16 no.1_2
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    • pp.509-513
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    • 2004
  • Some reasons for high leverage are analytically investigated by decomposing leverage into meaningful components. The results in this work can be used for remedial action as a next step of data analysis.

A Study on the Warning Limit of Statistical Control Chart by the Heuristic Approach (휴리스틱접근법(接近法)에 의한 관리도(管理圖)의 경고한계선(警告限界線)에 관한 연구(硏究))

  • Gang, Hyo-Sin
    • Journal of Korean Society for Quality Management
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    • v.12 no.2
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    • pp.15-24
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    • 1984
  • Since W.A. Shewhart (1931) developed the quality control method using the control chart, many theoretical and empirical works about such an analytical method have been done. However there are two major methods relating to the control chart analysis; the conventional 3 sigma control method and the warning limit method which has been suggested as a modification of the former. The conventional 3 sigma method requires to take a remedial action only when a quality characteristic is beyond the control limit (3 sigma). However, once a quality characteristic is over the control limit, searching and repairing an assignable cause requires time consuming job and high costs. Therefore if we set the warning limit between the central line and the control limit, we will be able to take remedial measures before too late. In spite of its advantage, much attention has not been paid to use the control chart with warning limit in Korean industries. The main object of this study is to examine improvement of quality and productivity when the control chart with warning limit is used.

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The effects of various thermal parameters on coil temperature rise in TEFC induction motor (여러가지 열적 변수가 전폐형 유도전동기의 코일온도상승에 미치는 영향에 관한 연구)

  • Yun, Myeong-Geun;Ha, Gyeong-Pyo;Go, Sang-Geun;Lee, Yang-Su;Han, Song-Yeop
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.21 no.4
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    • pp.570-578
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    • 1997
  • At design stage of new motor or when taking remedial action of old motor, a lot of information can be obtained from thermal parameters analysis. This study focused on the temperature rise of TEFC induction motor with respect to various thermal parameters. Frame heat transfer had the most important effect on coil temperature rise. But those of air gap and rotor fan had no effect. This fact shows fan action is more important than fin action in the case of rotor fan. Coil temperature can be more decreased by cooling near the heat sources than any other parts from the results of thermal conductivity and loss tests. Variation of cooling air flow rate and motor volume effects on coil temperature were also tested. These tests suggest that improvement of cooling fan performance is important in reducing the coil temperature rise. Thermal equivalent program was verified by comparison of some experimental results.

Proposal of Self Targeting Therapy of Mountain Ginseng Pharmacopuncture (산삼약침의 자가치료능에 대한 제언)

  • Cho, Byung-Jun;Kwon, Ki-Rok
    • Journal of Pharmacopuncture
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    • v.14 no.2
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    • pp.75-80
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    • 2011
  • Objectives & Methods: This research may accounts for Self Targeting Therapy (STT) which is a peculiar operation of Mountain Ginseng Pharmacopuncture. The objectives include analysis of its mechanism and reporting of clinical cases. Results: 1. STT of Mountain Ginseng Pharmacopuncture refers to the function of curing and making a diagnosis of the disease by oneself. 2. The mechanism of STT is to pursue the latent illness and make the remedial action by oneself. In this process, the symptom of latent disease is outwardly expressed. 3. The most popular symptom expressed is manifestation of pecular sensation along the specific meridians. Then followed headache, dizziness, powerless and etc. Diverse symptoms can be expressed by a patient. 4. If the revealed symptoms are carefully observed, the cause of the disease or the patient state can be diagnosed easily. Conclusion: The mechanism of STT of Mountain Ginseng Pharmacopuncture can be a great asset in clinical trials. Other studies on STT of Mountain Ginseng Pharmacopuncture should be followed in the future.

A study on the behaviour of coupled shear walls

  • Bhunia, Dipendu;Prakash, Vipul;Pandey, Ashok D.
    • Structural Engineering and Mechanics
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    • v.42 no.5
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    • pp.645-675
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    • 2012
  • An effective design technique for symmetrical coupled shear walls is presented. Proposed formulation including assumptions and steps with mathematical formulation has been elaborated to make the design technique. An example has been considered to validate the technique with the DRAIN-3DX (1993) and SAP V 10.0.5 (2000) nonlinear programs. Parametric study has also been considered to find out the limitations along with remedial action of this technique. On the other hand, nonlinear static analysis is considered to determine the response reduction factor of coupled shear walls. Finally, it has been concluded in this paper that the proposed design technique can be considered to design the coupled shear walls under seismic motion.

An Exploratory Study on University Student's Service Complaint and Recovery Perception toward Internet Fashion Shopping Mall (대학생들의 인터넷 패션 쇼핑몰에 대한 서비스 불평과 회복 지각에 관한 탐색적 연구)

  • Chung, Myung-Sun;Ju, Seong-Rae
    • The Research Journal of the Costume Culture
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    • v.15 no.4
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    • pp.551-568
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    • 2007
  • The purposes of this study were to identify factors of dissatisfaction and complaining behavior in internet fashion shopping mall, and to investigate constructs of service recovery for solution to this problems. Data were obtained from 201(male: 87, female: 114) internet fashion shopping mall consumer who have experiences of dissatisfaction and complaining behavior after buying products, and were analyzed using by descriptive analysis, factor analysis, Cronbach' $\alpha$, t-test. The results were as follows. First, the most response(80.4% of reponses) was experience to dissatisfaction through internet fashion shopping mall, and the most dissatisfied items were blouse, sweater, T-shirt in upper garment. Also, in men's case, the most satisfied price zone was not exceeding $30,000{\sim}50,000\;won$ and in women's case, it was not exceeding $20,000{\sim}30,000\;won$. Second, 7 factors of dissatisfaction(called quality, payment, delivery, price, interaction, returning/changing/refunding, contract) were identified after purchasing fashion products from internet shopping mall. 3 factors of complaining behavior(called private action, legal action, remedial seeking action) were investigated. Third, constructs of perceived service recovery were extracted from literature review: perceived interaction and justice. Perceived interaction were categorized into two factors: the interaction on the part of the consumer, the interaction in the part of the shopping mall. And perceived justice were categorized into three factors: interactional justice, distributive justice, procedural justice. Usually, university students were likely to take a serious view of service recovery through interaction and justice with internet fashion shopping mall.

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세라믹 가스센서를 이용한 토양증기추출공정의 배출가스 모니터링 기법 연구

  • 양지원;조현정;이재영;곽무영
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2002.09a
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    • pp.250-252
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    • 2002
  • The goals of environmental monitoring are to locate and quantify the significant contamination, estimate the fate and transport, estimate the potential exposure and risks to humans and the environment, and track the performance of various remedial technologies. In this study, ceramic gas sensor system is proposed to enhance the effectiveness of soil vapor extraction (SVE) process by monitoring the effluent gas. SVE is a technique that is widely used to remediate unsaturated soils contaminated with volatile organic contaminants. The sensor response for benzene, toluene, and xylene, the representative effluent gas compositions of SVE process, was evaluated using the proposed sensor system. As a result, it was verified that the response of sensor was increased or decreased very sensitively according to the change of the effluent gas concentration. Besides, the sensor could detect the difference over a wide range of concentration and it was more sensitive in order of xylene, toluene, and benzene. It is expected that this VOC analysis method results in field monitoring costs saying and appropriate immediate action for process control. More detailed experiments are being conducted in our research group.

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