منابع مشابه
islanding detection methods for microgrids
امروزه استفاده از منابع انرژی پراکنده کاربرد وسیعی یافته است . اگر چه این منابع بسیاری از مشکلات شبکه را حل می کنند اما زیاد شدن آنها مسائل فراوانی برای سیستم قدرت به همراه دارد . استفاده از میکروشبکه راه حلی است که علاوه بر استفاده از مزایای منابع انرژی پراکنده برخی از مشکلات ایجاد شده توسط آنها را نیز منتفی می کند . همچنین میکروشبکه ها کیفیت برق و قابلیت اطمینان تامین انرژی مشترکان را افزایش ...
15 صفحه اولDetection of anomalous bids in procurement auctions
Procurement of goods, services, or public works, is often accomplished by reverse auctions, where suppliers provide their competitive biddings to a buyer. Since the assignment is typically awarded to the supplier providing the lowest bid, each tenderer is spurred to provide the lowest possible bid, taking into account the expected level of competition and its expected rate of return. In some ca...
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We document a novel bidding pattern observed in procurement auctions from Japan: winning bids tend to be isolated. We prove that in a general class of models, missing bids robustly indicate non-competitive behavior. In addition, we provide evidence that missing bids coincide tightly with known cartel activity. Finally, we show that missing bids are consistent with efficient collusion in environ...
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We have measured the joint Q-function of a highly multimode field using unbalanced heterodyne detection with a charge-coupled device array detector. We use spectral interferometry between a weak signal field and a strong, 100 fs duration local oscillator pulse to reconstruct the joint quadrature amplitude statistics of about 25 temporal modes. By adjusting the time delay between the signal and ...
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Big data means big datacenters, comprised of hundreds or thousands of machines. With so many machines, failures are commonplace. Failure detection is crucial: undetected failures may lead to data loss and outages. Recent health monitoring approaches use anomaly detection to forecast failures – anomalous machines are considered to be at risk of future failures. Our previous work focused on detec...
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ژورنال
عنوان ژورنال: Open Journal of Civil Engineering
سال: 2017
ISSN: 2164-3164,2164-3172
DOI: 10.4236/ojce.2017.73028