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RISS 인기검색어
- 검색키워드
- 저자 : Ali S. Alghamdi (검색결과 2 건)
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Riaz Uddin,Ali S. Alghamdi,Muhammad Hammad Uddin,Ahmed Bilal Awan,Syed Atif Naseem 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.6
The fault diagnosis and control through fault detection, isolation and supply restoration (FDIR) technique is the part of a commonly used distribution management system application in smart grid. When the fault occurs, it becomes essential to detect and isolate the faulty section of the distribution network at once and then restore back to its running condition through tie switches. The communication between IEDs is done through diferent communication mediums such as Ethernet, wireless, power line communication etc. Therefore, formal analysis of the FDIR mechanism is required with communication network (ideally Ethernet), which helps us to predict the behavior of FDIR response upon the occurrence of fault in terms of various important probabilities, reliability study and efciency (showing the system will work properly). In this regard, for the above said analyses, this article discusses (a) the development of the Markovian model of FDIR for distribution network of smart grid considering Tianjin Electric Power Network as case study with intelligent electronic devices (IEDs) using ideal communication medium (Ethernet); (b) utilized probabilistic model checker (PRISM tool) to predict the probabilities; (c) perform the reliability analyses and (d) study the efciency of FDIR behavior for future grid using logical properties. The detailed analysis and prediction (done for the fault occurrence scenario) mainly focus in determining the (1) the probability of switching failures of FDIR in smart grid; (2) the probability of isolating the defective switch from the system within limited time and (3) the probability of restoring the system automatically within the minimum possible interval.
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Rewaida Abdel-Gaber,Masheil Alghamdi,Maysar Abu Hawsah,Safyah Ali,Ramy S. Yehia 국립중앙과학관 2020 Journal of Asia-Pacific Biodiversity Vol.13 No.2
Parasites, particularly crustaceans, are considered as an important limiting factor in the development ofintensified fish culture. The parasitic copepod of the Arabian Gulf fish is poorly known. So, the currentinvestigation aimed to record the caligid species infecting the rosy goatfish Parupeneus rubescens in theArabian Gulf. One copepod species was identified belonged to family Caligidae and labeled as Lepeophtheirussalmonis Krøyer 1837 depends mainly on its morphological, morphometric, and ultrastructuralcharacteristics. It is characterized by lacking lunules, the anterior margin of the cephalothorax is notfolded, three-segmented exopod of the fourth leg and longer than the protopod, leg 4 with the middleterminal claw as long as the inner one, accessory processes on terminal elements II and III of the exopodof the first leg, a genital complex distinctly wider than being long, and a relatively short abdomen. Therefore, the present study demonstrated that the rosy goatfish represents a new host for Lepeophtheirusspecies and added locality records for this infection.
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