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Purpose: The treatment priority in management of Temporomandibular Joint (TMJ) pain is directed towards the causative factor along with symptomatic treatment. In this process many times psychological aspect is overlooked. Hence with this pilot study, importance of psychological aspect of Temporomandibular Joint Disorder (TMD) is emphasised. Methods and Material: 15 patients suffering from pain in TMD region who qualify under myalgia pain in DC/TMD Axis I category were selected. Patients were divided into 3 groups; Ibuprofen, placebo and occlusal splint with 5 patients in each group. Pain assessment was done at the first visit, 7th day visit and 14th day visit using a VAS scale. Statistical Analysis Used: Friedman Test was applied to determine overall relief from pain in the three groups. Wilcoxon sign rank test evaluated pain relief between each time interval. Kruskal Wallis Test compared different groups for relief from pain at each time interval. Key Finding: Wilcoxon sign rank test showed a significant pain relief in all three groups from I day to I follow up day and I day to II follow up day. However Pain relief from I follow up to II follow up day was significant only in placebo group. Conclusions: Management of TMD myalgia requires a comprehensive understanding of physical and psychological aspect. This will aid us in formulating a treatment plan comprising pharmacotherapy, placebo or physical therapy or combination of any of these.

Purpose: The treatment priority in management of Temporomandibular Joint (TMJ) pain is directed towards the causative factor along with symptomatic treatment. In this process many times psychological aspect is overlooked. Hence with this pilot study, importance of psychological aspect of Temporomandibular Joint Disorder (TMD) is emphasised. Methods and Material: 15 patients suffering from pain in TMD region who qualify under myalgia pain in DC/TMD Axis I category were selected. Patients were divided into 3 groups; Ibuprofen, placebo and occlusal splint with 5 patients in each group. Pain assessment was done at the first visit, 7th day visit and 14th day visit using a VAS scale. Statistical Analysis Used: Friedman Test was applied to determine overall relief from pain in the three groups. Wilcoxon sign rank test evaluated pain relief between each time interval. Kruskal Wallis Test compared different groups for relief from pain at each time interval. Key Finding: Wilcoxon sign rank test showed a significant pain relief in all three groups from I day to I follow up day and I day to II follow up day. However Pain relief from I follow up to II follow up day was significant only in placebo group. Conclusions: Management of TMD myalgia requires a comprehensive understanding of physical and psychological aspect. This will aid us in formulating a treatment plan comprising pharmacotherapy, placebo or physical therapy or combination of any of these.

The Electrical Power Systems (EPS) are indispensable for a Nuclear Power Plant (NPP). The EPS are essential for plant start-up, normal operation, and emergency conditions. Electrical power systems are necessary not only for power generation, transmission, and distribution but also to supply reliable power for plant operation and control system during safe operation, Design Basis Conditions (DBC) and Design Extension Conditions (DEC). According to IAEA Specific Safety Guide SSG-34, EPS are essentially the support systems of many plant equipment. Electrical system, which supply power to plant systems important to nuclear safety, are essential to the safety of an NPP. In recent years, due to the digitization of Instrumentation and Control (I&C) systems, along with their enhanced accuracy, ease of implementing complex functions and flexibility, have been also exposed to sophisticated cyber threats. Despite physical separation and redundant electrical power supply sources, malicious cyber-attacks performed by insiders or outsiders might disrupt the power flow and result in an interruption in the normal operation of an NPP. Therefore, for the uninterrupted operation of a plant, it is crucial to contemplate cybersecurity in the EPS design and implementation. Considering multiple cyber threats, the main objectives of this research work are finding out security vulnerabilities in electrical power systems, simulating potential cyber-attacks and analyzing the impacts of these attacks on the electrical components to protect the electrical systems against these cyber-attacks. An EPS testbed at a small scale was set up, which included commercial I&C and electrical equipment significant for the cybersecurity analysis. The testbed equipment comprises of electrical protection relay (IEC 60255), controller, operating panel, engineering workstation computer, simulation model, etc. to monitor and control the power supply of one or more electrical equipment responsible for a regular ope

The Electrical Power Systems (EPS) are indispensable for a Nuclear Power Plant (NPP). The EPS are essential for plant start-up, normal operation, and emergency conditions. Electrical power systems are necessary not only for power generation, transmission, and distribution but also to supply reliable power for plant operation and control system during safe operation, Design Basis Conditions (DBC) and Design Extension Conditions (DEC). According to IAEA Specific Safety Guide SSG-34, EPS are essentially the support systems of many plant equipment. Electrical system, which supply power to plant systems important to nuclear safety, are essential to the safety of an NPP. In recent years, due to the digitization of Instrumentation and Control (I&C) systems, along with their enhanced accuracy, ease of implementing complex functions and flexibility, have been also exposed to sophisticated cyber threats. Despite physical separation and redundant electrical power supply sources, malicious cyber-attacks performed by insiders or outsiders might disrupt the power flow and result in an interruption in the normal operation of an NPP. Therefore, for the uninterrupted operation of a plant, it is crucial to contemplate cybersecurity in the EPS design and implementation. Considering multiple cyber threats, the main objectives of this research work are finding out security vulnerabilities in electrical power systems, simulating potential cyber-attacks and analyzing the impacts of these attacks on the electrical components to protect the electrical systems against these cyber-attacks. An EPS testbed at a small scale was set up, which included commercial I&C and electrical equipment significant for the cybersecurity analysis. The testbed equipment comprises of electrical protection relay (IEC 60255), controller, operating panel, engineering workstation computer, simulation model, etc. to monitor and control the power supply of one or more electrical equipment responsible for a regular ope

The Electrical Power Systems (EPS) are indispensable for a Nuclear Power Plant (NPP). The EPS are essential for plant start-up, normal operation, and emergency conditions. Electrical power systems are necessary not only for power generation, transmission, and distribution but also to supply reliable power for plant operation and control system during safe operation, Design Basis Conditions (DBC) and Design Extension Conditions (DEC). According to IAEA Specific Safety Guide SSG-34, EPS are essentially the support systems of many plant equipment. Electrical system, which supply power to plant systems important to nuclear safety, are essential to the safety of an NPP. In recent years, due to the digitization of Instrumentation and Control (I&C) systems, along with their enhanced accuracy, ease of implementing complex functions and flexibility, have been also exposed to sophisticated cyber threats. Despite physical separation and redundant electrical power supply sources, malicious cyber-attacks performed by insiders or outsiders might disrupt the power flow and result in an interruption in the normal operation of an NPP. Therefore, for the uninterrupted operation of a plant, it is crucial to contemplate cybersecurity in the EPS design and implementation. Considering multiple cyber threats, the main objectives of this research work are finding out security vulnerabilities in electrical power systems, simulating potential cyber-attacks and analyzing the impacts of these attacks on the electrical components to protect the electrical systems against these cyber-attacks. An EPS testbed at a small scale was set up, which included commercial I&C and electrical equipment significant for the cybersecurity analysis. The testbed equipment comprises of electrical protection relay (IEC 60255), controller, operating panel, engineering workstation computer, simulation model, etc. to monitor and control the power supply of one or more electrical equipment responsible for a regular ope

The Electrical Power Systems (EPS) are indispensable for a Nuclear Power Plant (NPP). The EPS are essential for plant start-up, normal operation, and emergency conditions. Electrical power systems are necessary not only for power generation, transmission, and distribution but also to supply reliable power for plant operation and control system during safe operation, Design Basis Conditions (DBC) and Design Extension Conditions (DEC). According to IAEA Specific Safety Guide SSG-34, EPS are essentially the support systems of many plant equipment. Electrical system, which supply power to plant systems important to nuclear safety, are essential to the safety of an NPP. In recent years, due to the digitization of Instrumentation and Control (I&C) systems, along with their enhanced accuracy, ease of implementing complex functions and flexibility, have been also exposed to sophisticated cyber threats. Despite physical separation and redundant electrical power supply sources, malicious cyber-attacks performed by insiders or outsiders might disrupt the power flow and result in an interruption in the normal operation of an NPP. Therefore, for the uninterrupted operation of a plant, it is crucial to contemplate cybersecurity in the EPS design and implementation. Considering multiple cyber threats, the main objectives of this research work are finding out security vulnerabilities in electrical power systems, simulating potential cyber-attacks and analyzing the impacts of these attacks on the electrical components to protect the electrical systems against these cyber-attacks. An EPS testbed at a small scale was set up, which included commercial I&C and electrical equipment significant for the cybersecurity analysis. The testbed equipment comprises of electrical protection relay (IEC 60255), controller, operating panel, engineering workstation computer, simulation model, etc. to monitor and control the power supply of one or more electrical equipment responsible for a regular ope

This dissertation is motivated by the housing crisis of 2008. It consists of three chapters. In the first chapter, "Too Much Skin-in-the-Game? The Effect of Mortgage Market Concentration on Credit and House Prices," I propose a new theory to help explain the housing crisis. During the housing boom, a small number of institutions - the government-sponsored enterprises (GSEs) and a few banks - held most of U.S. mortgage risk. I develop a theory in which such concentration of mortgage exposure can explain features of the housing crisis. I show that large lenders with many outstanding mortgages have incentives to extend risky credit to prop up house prices. An increase in concentration can lead to a boom with worsening credit quality and a subsequent bust with widespread defaults. In the second chapter, "Concentration and Lending in Mortgage Markets," joint with Ronel Elul and David Musto, we attempt to test the theory described in the first chapter. We provide evidence that concentration in mortgage markets can create perverse lending incentives. We exploit variation in the size of the GSEs' outstanding mortgage exposure across MSAs. Using a loan-level dataset, we provide evidence that the GSEs were more likely to engage in high-risk activities in areas where they had a large exposure to outstanding mortgages. We also provide evidence that this relationship is driven by an incentive to keep house prices high. In the final chapter, "Housing Booms and the Crowding-Out Effect," joint with Itay Goldstein, we study the effect that investment in real estate assets has on the economy. We develop a theory in which housing price booms can sometimes lead to a crowding-out of corporate investment. We show that an increase in real estate prices does not necessarily increase aggregate investment even when firms actively use real estate assets as collateral to borrow against and invest the proceeds in positive NPV projects. We argue that at times, it can be optimal to decrease the p