• Proceedings of the KIEE Conference
• /
• 2002.11b
• /
• pp.202-205
• /
• 2002

This paper presents the reliability evaluation methods considering the momentary voltage quality in power distribution systems. The voltage qualify phenomena deal with this paper are sustained and momentary interruptions and voltage sags. Conventional evaluation indices and methods are summarized for the sustained interruptions, and the assessment methodologies of momentary interruptions and voltage sags are proposed. The evaluation methods are divided into the analytical method and Time Sequential Monte Carlo simulation. The proposed methods are tested using the modified RBTS (Roy Billinton Test System) form and historical reliability data of KEPCO system.

• Journal of Korean Society of Rural Planning
• /
• v.9 no.2 s.19
• /
• pp.29-37
• /
• 2003

The objectives of this study are to develop an agricultural drought evaluation model based on administrative boundaries and to assist the effective drought-related decision-making of local governments. The model which was named ADEM(Administrative Drought Evaluation Model for Paddies) is designed to simulate daily water balance between available water quantities from various agricultural water facilities such as reservoirs, wells, pump stations, etc. and water requirements in paddies. And in order to numerically describe the agricultural drought severity, two indices were defined; One is ADFP(Agricultural Drought Frequency for Paddies) which is calculated with a frequency analysis of monthly water deficit, and the other is ADIP(Agricultural Drought Index for Paddies) with a scale of $-4.2{\sim}+4.2$. The developed model was applied to Yeoju district and showed good correspondence with the historical records of drought.

• Proceedings of the Korean Information Science Society Conference
• /
• 2012.06a
• /
• pp.182-184
• /
• 2012

산업분야에서 이용되는 이력 데이터는 압력, 부피, 온도, 볼트, 전류, 전압 등 각종 제어기나 센서에서 발생하는 입력 정보를 일정 시간 간격으로 수집되는 데이터로, 데이터의 값이 일정하거나 값의 폭이 좁고, 많게는 수만 개의 포인트가 실시간으로 수집, 저장되어지는 대용량의 데이터라는 특징이 있다. 이러한 특성을 지닌 이력 데이터는 이력의 모든 데이터를 저장하지 않고, 전체를 대표하는 데이터의 일부만을 저장함으로써 이력 데이터의 효율적인 관리와 공간효율을 극대화시킬 수 있다. 이러한 이력 데이터를 효과적으로 관리하고, 보관하기 위해 이력 데이터 압축 알고리즘에 대한 개발과 연구가 진행 중이다. 그러나 이미 알려져 있는 이력 데이터 압축 알고리즘과 개발하고 있는 알고리즘의 성능에 대한 평가를 할 수 있는 시뮬레이터는 개인이나 소규모 집단만을 위해 만들어지거나, 공개되지 않고 있어 사용하기에 제한적이다. 이에 이력 데이터 압축 성능평가를 위한 시뮬레이터인 HDCS(Historical Data Compression Simulator)를 설계하고 구현하고자 한다.

• Journal of architectural history
• /
• v.2 no.1 s.3
• /
• pp.126-135
• /
• 1993

Italian Rationalism held a specific position in the Modern Movements of Architecture, due to the fact that Italian Rationalism could not totally escape from the classical tradition of Italy. Until the seventies, Italian Rationalism had been criticized for having made no contribution to the progressive aspects of the Modern Movements owing to the very keeping of tradition. After the seventies, however, there emerged a movement which tries to reinterprete the Modern Movements of Architecture in relation to tradition and under this new situation, Italian Rationalism is believed to have a historical possibility of unifying tradition with modernity. This study is to show how Italian Rationalism struggled with the issue of tradition, why Italian Rationalism was under-evaluated and which historic lesson we can learn from it in the contemporary days of the revivalistic Post-Modernism.

• Journal of the Korean Society for Library and Information Science
• /
• v.2
• /
• pp.79-102
• /
• 1971

The P'aerim and the Taedong Yasung are the two better known among unofficial history collections of the Yi Dynasty still available. The compilers and writers of unofficial historical records generally were people without official connection with the incidents recorded, and were thus in a position to be critical in their evaluation. Therefore, in order to gain a balanced view of Korean history, these unofficial history sources must also be consulted. However, there are differences in the contents of various unofficial history collections, even though the titles may be identical. For this reason, the writer has made a comparative study on the. contents of both the P'aerim and the Taedong Yasung. As a result, various differences between the two collections are noted. This points out the need for continued research on collections of unofficial historical records.

• SUVANNABHUMI
• /
• v.8 no.2
• /
• pp.79-111
• /
• 2016

Malaya attained independence on August 31, 1957 from Britain. However this new nation faced a communist insurgency known today as the "Malayan Emergency" (1948-1960). Then in 1961, Tunku announced a wider federation of "Malaysia", viz. Malaya, British Crown Colonies of Singapore, Sarawak and North Borneo, and the protectorate of Brunei. Countering communism was a principal motive for "Malaysia". Sarawak's leftist elements were rejected with an armed opposition. Malaysia was formed excluding Brunei. Amidst its birth pangs, Malaysia faced hostile neighbors Indonesia and the Philippines; the former objected by way of Konfrontasi (1963-1967) while the latter laid claim to Sabah (formerly North Borneo). Malaya/ Malaysia was borne in the midst of the Cold War (1947-1991), a bipolar world between the US and the USSR. Malaya/Malaysia is utilized as a case of analysis and evaluation in the context of the twin trends of continuities and transformations in tracing the historical developments from the 1950's to the 1990's. The risks, motives, and challenges that prompted the shift in foreign relations reveal as much of the personality of the political leadership, the prevailing situations, and conditions from within and circumstances from without.

• The Journal of the Korea Contents Association
• /
• v.22 no.5
• /
• pp.110-124
• /
• 2022

The purpose of this study is to develop community design evaluation factors for sustainable urban regeneration and to suggest considerations for sustainable community design by analyzing excellent community design cases. Through literature review, previous studies on the concept and core items of sustainable urban regeneration, and the concept and components of community design were considered. In addition, evaluation indicators for sustainable community design were developed in the socio-economic, physical, environmental, historical and cultural dimensions through the analysis of the linkage with the evaluation factors of community design through the analysis of previous studies. The evaluation index consists of 3 evaluation items and 9 items including social performance and participation at the social level, economic feasibility at the economic level, environmental characteristics at the physical and environmental level, accessibility, contextuality, locality at the historical and cultural level, identity, and artistry. Includes dog evaluation factors. Reliability and effectiveness are secured through the developed evaluation index and detailed description and expert verification. Exploratory factor analysis and expert interviews were conducted through the survey, and as a result of the analysis, the stability and Cronbach'α coefficients were verified, and the validity of the community design evaluation index considering sustainable urban regeneration was recognized through expert interview. The results of this study are considered meaningful in that they can provide basic data for the improvement of community design for sustainable urban regeneration in the future.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• autumn
• /
• pp.423-426
• /
• 2002

The foundation for developing a cost estimation system based on historical data has been being prepared in Korea. Historical data is a priori of developing a cost estimation model. Cost Index, one of the historical data, is used to estimate construction cost and to adjust the amount of contract money in the foreign country, whereas it is not used in domestic except for the road construction project in Korea. Construction cost indices can be used by an estimator in tender analysis, pricing, price adjustment, cost planning, and forecasting. In this regards, this paper identified the problems in developing Cost Index evaluation process by comparing the standard of framing Cost Index used in British to the one used in Korea. Then, the scheme for improving a Cost Index required for Site Developing Construction was proposed. Twenty-two cases of engineering estimate data were used to compare the domestic standard to the foreign one in deriving a Cost Index.

• The Transactions of the Korean Institute of Electrical Engineers A
• /
• v.52 no.12
• /
• pp.705-712
• /
• 2003

In this paper, we propose new unified methodologies of reliability and its cost evaluation in power distribution systems. The unified method means that the proposed reliability approaches consider both conventional evaluation factor, i.e. sustained interruptions and additional ones, i.e. momentary interruptions and voltage sags. Because the three voltage quality phenomena generally originate from the outages on distribution systems, the basic and additional reliability indices are summarized considering the fault clearing mechanism. The proposed unified method is divided into the reliability evaluation for calculating the reliability indices and reliability cost evaluation for assessing the damage of customer. The analytic and probabilistic methodologies are presented for each unified reliability and its cost evaluation. The time sequential Monte Carlo technique is used for the probabilistic method. The proposed DVL(Demand Varying Load) model is added to the reliability cost evaluation substituting the average load model. The proposed methods are tested using the modified RBTS(Roy Billinton Test System) form and historical reliability data of KEPCO(Korea Electric Power Corporation) system. The daily load profile of the each customer type in domestic are gathered for the DVL model. Through the case studies, it is verified that the proposed methods can be effectively applied to the distribution systems for more detail reliability assessment than conventional approaches.

• Journal of Information Processing Systems
• /
• v.17 no.1
• /
• pp.136-150
• /
• 2021

The modern market is highly competitive. It has progressed from traditional competition between enterprises to competition between supply chains. To ensure that enterprise can form the best strategy consistently, it is necessary to evaluate the trust of other enterprises in the supply chain. First, this paper analyzes the background and significance of supply chain trust research, analyzes and expounds on the qualitative and quantitative methods of supply chain trust evaluation, and summarizes the research in this field. Analytic hierarchy process (AHP) is the most frequently used method in the literature to evaluate and rank criteria through data analysis. However, the input data for AHP analysis is based on human judgment, and hence there is every possibility that the data may be vague to some extent. Therefore, in view of the above problems, this study improves the global trust method based on chain iteration. The improved global trust evaluation method based on chain iteration is more flexible and practical, hence, it can more accurately evaluate supply chain trust. Finally, combined with an actual case of Zhaoxian Chengji Food Co. Ltd., the paper qualitatively analyzes the current situation of supply chain trust management and effectively strengthens the supervision of enterprises to cooperative enterprises. Thus, the company can identify problems on time and strategic adjustments can be implemented accordingly. The effectiveness of the evaluation method proposed in this paper is demonstrated through a quantitative evaluation of its trust in downstream enterprise A. Results suggest that the subjective preferences of and historical transactions together affect the final evaluation of trust.