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Cognitive Dynamic System for Control and Cyber Security in Smart GridOozeer, Mohammad Irshaad January 2020 (has links)
The smart grid is forecasted to be the future of the grid by integrating the traditional grid with information and communication technology. However, the use of this technology has not only brought its benefits but also the vulnerability to cyber-attacks. False data injection (FDI) attacks are a new category of attacks targeting the smart grid that manipulates the state estimation process to trigger a chain of incorrect control decisions leading to severe impacts.
This research proposes the use of cognitive dynamic systems (CDS) to address the cyber-security issue and improve state estimation. CDS is a powerful research tool inspired by certain features of the brain that can be used to study complex systems. As two of its special features, Cognitive Control (CC) is concerned with control in the absence of uncertainty, Cognitive Risk Control (CRC) uses the concept of predictive adaptation to bring risk under control in the presence of unexpected uncertainty.
The primary research objective of this thesis is to apply the CDS for the SG with emphasis on state estimation and cyber-security. The main objective of CC is to improve the state estimation process while CRC is concerned with mitigating cyber-attacks. Simulation results show that the proposed methods have robust performance for both state estimation and cyber-attack mitigation under various challenging scenarios.
This thesis contributes to the body of knowledge by achieving the following objectives: proposes the first theoretical work that integrates the CDS with the DC model of the SG for control and cyber-attack detection; demonstrates the first experimental work that brings a new concept of CRC for cyber-attack mitigation for the DC state estimator; introduces a new CDS architecture adapted for the AC model of the SG for state estimation and cyber-attack mitigation which builds upon all the research efforts made previously. / Thesis / Doctor of Philosophy (PhD) / The smart grid is forecasted to be the future of the grid by integrating the traditional grid with information and communication technology. However, the use of this technology has not only brought its benefits but also the vulnerability to cyber-attacks. False data injection attacks is a new category of attacks targeting the smart grid that can cause serious damage by manipulating the state estimation process and starting a chain of incorrect control decisions. The cognitive dynamic system is a powerful research tool inspired by the brain that can be used to study real time cyber physical systems. The key goal of this thesis is to apply cognitive dynamic systems to the smart grid to improve the state estimation process, detect cyber-attacks and mitigate their effects. Simulation results show that the proposed methods have robust performance in both state estimation and cyber-attack mitigation under various challenging scenarios.
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台灣DRAM製造廠商風險管理問題之研究-以案例研討為中心 / CASE STUDY ON THE RISK MANAGEMENT OF DRAM MANUFACTURING COMPANY IN tAIWAN郭頴彥, Kuo, Ying-Yan Unknown Date (has links)
二十一世紀初的經濟不景氣橫掃了全球的DRAM製造產業,讓全世界的DRAM製造產商大賠了120億美金,國內廠商受傷尤其嚴重,甚至發生公司債之債務不履行事件,國內廠商岌岌可危。本論文主要係以案例探討之方式,研究國內DRAM製造廠商之經營模式、產業特性與風險管理問題,尤其在面對國際間產業劇烈之競爭下,國內之DRAM製造商的經營條件比國際大廠更為艱困,例如:金融環境、政府支援程度、生產規模、技術自主問題等與國外廠商皆有一段差距,因此在經營上所面對之風險與其他國家製造商相較,其實更為險峻。 / 本文以案例公司發生公司債之債務不履行事件為切入點,深入地了解一家在本國企業中屬於中大型企業之DRAM製造公司,為何會有債務不履行之情況發生?其近因似為案例公司在財務上過度倚賴公司債為籌資工具,且公司債之到期或轉換公司債之履約期間過於密集,以致產生流動性問題,然而其遠因乃在於DRAM產品價格快速的滑落,廠商缺乏適當的風險管理工具及機制以應付DRAM之價格風險。DRAM產品為成本競爭導向之標準產品,成本競爭來自於生產良率、製程微縮與新建更大尺寸廠房,當每家廠商都競逐於經濟規模以降低成本時產業會變得不穩定而暴起暴落,在產品價格處於高點時,所有廠商將產能利用率(稼動率)推到最高,此時因產能稼動率高,因此平均每單位晶片之生產成本較低,所以廠商獲利頗豐,並可輕易自資本市場取得資金擴充產能;等到市場供過於求,產品價格下跌處於低點時,廠商只好減產以降低損失,在其他條件不變下,此時因產能稼動率低,因此平均每單位晶片之生產成本反而較產品價格好時還要高,產品價格下跌所帶來的巨額損失,對廠商的虧損有乘數效果,此時廠商在資本市場或銀行等間接金融市場都不容易籌措到資金,本文以案例公司所面對之風險管理問題,提供幾個避險之建議,其中包括金融業、政府等應該能夠扮演更積極的角色,創造共贏共榮的局面,並避免類似之事件再發生,此為本文最大之貢獻。
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Administratívna budova v Trenčíne - stavebno technologický projekt / Office building in Trencin - construction technology projectPanáček, Jakub January 2018 (has links)
The subject of my dissertation is to describe construction technology project of the administration building in Trencin. I focused on the budget, work schedule, environmental protection, appropriate setup of temporary objects on the construction site and efficient machine assembly. Result of work represents possible construction progression with focus on site condistions.
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A security risk management approach to the prevention of theft of platinum group metals: case study of Impala Platinum Mines and RefineryMokhuane, Seadimo Joseph 02 1900 (has links)
Text in English / The purpose of this study was to establish the vulnerabilities of the security control measures that are being used at Impala Platinum mines and refinery to prevent the theft of Platinum Group Metals (PGMs). It is important to ensure that the security control measures in place are effective and efficient in preventing the occurrence of such theft.
The research examined the security risk management approach to the prevention of theft of PGMs and the causes of theft of PGMs by organised crime syndicates operating in South Africa and abroad.
The study found that Impala Platinum employees, in collusion with contractors and members of mine security services, are involved in the theft of PGMs.
To achieve the goals and objective of the research study, effective security control measures were identified that will help Impala Platinum mines and refinery to overcome the risks and challenges related to the theft of PGMs. / Security Risk Management / M. Tech. (Security Management)
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