Browsing by Author "CHEN, TY"

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OUTAGE COSTS CAUSED BY VARIOUS OUTAGE DEPTHS
(1993-09-01)
HSU, GJY
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CHANG, PL
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CHEN, TY
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交大名義發表
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管理科學系
This paper examines the quantitative relationship between power customers' outage costs and their outage depths. Taiwan's cement industry has been chosen as a study case. Thirteen factories were surveyed and, based on this, the survey data of the factories were subject to analyses of variance and covariance. We conclude that an appropriate priority service rate should be designed to meet the curtailable load covering the cement milling and raw milling stage, which represents 68% of the customers' contracted load. The corresponding outage cost of the cement factory is $1.05/kWh. Areas for further research are also suggested in this paper.
PRIORITY SERVICE AND OUTAGE COSTS IN THE POWER SECTOR - THE TAIWAN PERSPECTIVE
(1993)
HSU, GJY
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CHEN, TY
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管理科學系
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Department of Management Science
THEORETICAL-STUDY OF 2-FREQUENCY COHERENCE OF MST RADAR RETURNS
(1995-11-01)
CHU, YH
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CHEN, TY
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電控工程研究所
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Institute of Electrical and Control Engineering
The theoretical expressions of two-frequency coherence of the MST radar returns from an atmospheric thin layer with sharp boundaries, which embeds within the radar volume and cannot be resolved by conventional radar techniques, are derived in this article. It shows that the derived frequency domain interferometry (FDI) coherence is not only the function of layer thickness and the components of radar wave vector, but also related to the wavenumber power spectrum of refractivity irregularities. A quantitative examination of the derived FDI coherence indicates that the effect of the irregularity power spectrum on FDI coherence is negligible for power law spectral model, while it cannot be ignored for other spectral forms, for example, a Gaussian model. The zenith angle dependence of FDI coherence is also investigated in this article. According to the observations made with Chung-Li VHF radar, it shows that the ratio of the observed FDI coherence at the vertical to that at 17 degrees off-zenith angle is between 1.3 and 2.4. This feature can be illustrated satisfactorily by using the theory developed in this article. The effect of echoing mechanism on FDI coherence is also studied, showing that the expression of FDI coherence derived from the turbulent scattering theory can be treated to be identical to that from the Fresnel reflection theory as long as the condition Delta k/k << 1 is met. This result implies that it seems to be impossible to identify the echoing mechanism of MST radar by using FDI technique. The problem of estimating the thickness of a thin layer having sharp boundaries by using a Gaussian function with the expression of exp (-Delta k(2) sigma(r)(2),2) is also discussed. It suggests that the pertinent formula used for layer thickness estimate is L = 2.364 sigma(r). A comparison of this work with other results is also made in the text.
VARIOUS METHODS FOR ESTIMATING POWER OUTAGE COSTS - SOME IMPLICATIONS AND RESULTS IN TAIWAN
(1994-01-01)
HSU, GJY
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CHANG, PL
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CHEN, TY
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管理科學系
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Department of Management Science
This paper first presents various methods for estimating outage costs and a comprehensive review of related literature on the subject. Four types of outage costs are then discussed, and their empirical results for Taiwan are compared. The authors argue that selecting an appropriate method for estimating a specific type of outage cost is extremely important. In addition, the economic implications of each different type of outage cost, as well as its strengths and weaknesses, must be assessed. Finally, some empirical results for Taiwan are presented and further research areas are recommended.