Chetan Shiva Shankar

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A pervasive system features a plethora of devices, services and applications organized as a large distributed system. One approach to managing such systems is by policies where administrators specify the management action to be taken in different situations using event-condition-action (ECA) rules. An important problem with policy-based management of a(More)
Enterprise and grid computing systems are complex and subject to a broad range of changes such as configuration updates, failures, and performance degradations. These changes affect infrastructure elements such as computation and storage nodes, applications, and system management elements such as monitoring infrastructures. Today's best practices in use by(More)
Ubiquitous computing envisions a habitat where the abundance of mobile devices, services and applications allows the physical and virtual worlds to become seamlessly merged. Users in such a habitat can access their applications and data anywhere and anytime, and perform everyday tasks with greater ease. Applications are not bound to any single device but(More)
Ubiquitous computing environments feature massively distributed systems containing a large number of devices, services and applications that help end-users perform various kinds of tasks. One way by which administrators and end-users can manage these environments is through the use of policies. In particular, obligation policies are used to specify what(More)
A cell-wall-surface protein purified from the cells of Saccharomyces cerevisiae NCYC 227 was found to be involved in the non-sexual flocculation of this yeast. This 13 kDa protein was found to bind specifically to mannose. The protein bound to mannans isolated from yeast as well as in situ to intact cells, but only in the presence of calcium ions. The(More)
Pervasive systems comprise large collections of heterogeneous and mobile devices, services and applications. A management infrastructure is required to govern the system behavior according to policies specified by the system administrator. Policy-based management is a well-established approach where policies are specified as Event-Condition-Action (ECA)(More)
In today's enterprise computing environments, changes in the computing environment are frequent: systems are redeployed on demand, and new services are brought up and down, or migrated within or across data centers. This dynamic environment requires a monitoring infrastructure that automatically adapts yet many monitoring infrastructure components today(More)
Pervasive systems are complex distributed systems containing heterogeneous and mobile devices, services and applications. Policy-based management is an effective approach for managing these systems. The dynamism of a pervasive system due to mobility of devices and applications makes policy specification and management a difficult problem. Policies need to(More)
In rapidly fermenting yeast, the rotenone insensitive mitochondrial NADH dehydrogenase was not completely repressed by high glucose. This activity appeared to enhance the glycolytic rate due to which acetaldehyde accumulated intracellularly. To overcome the toxicity of acetaldehyde, the strain produced stress proteins. During late stationary phase of(More)