A major goal for database research has been the incorporation of additional semantics into database models. It is recognized that the relational database model has semantic and structured drawbacks when it comes to modeling some emerging applications such as computer aided design (CAD), geographical information systems (GIS), and artificial intelligence. In response to this problem, some attemp...

This thesis reports on the results of a study of the nested join operator in a mediator-based setting. As the rate at which data is accumulated increases, the need for integration of di erent (physical) Database Management Systems (DBMS) becomes apparent. The most fundamental and arguably important operation that is used in order to achieve this is the join-operator. The nested-relational model...

This paper develops a nested iteration algorithm to solve time-dependent nonlinear systems of partial differential equations. For each time step, Newton’s method is used to form approximate solutions from a sequence of nested spaces, where the resolution of the approximations increases as the algorithm progresses. Nested iteration results in most of the iterations being performed on coarser gri...

Transactional Memory (TM) simplifies parallel programming by transferring responsibility for concurrency management from the programmer to the system. Nevertheless, a number of challenges must be addressed for TM to be widely adopted. This dissertation presents work towards improving the practicality of TM across three dimensions. The first challenge addressed is that of integrating TM with pop...

A new formal model is presented for studying concurrency and resiliency properties for nested transactions. The model is used to state and prove correctness of a well-known locking algorithm. This paper develops the foundation for a general theory of nested transactions. We present a simple formal model for studying concurrency and resiliency in a nested environment. This model has distinct adv...

We provide the first behavioral characterization of nested logit, a foundational and widely applied discrete-choice model, through introduction nonparametric version logit that we call “nested stochastic choice” (NSC). NSC is characterized by single axiom weakens independence irrelevant alternatives on basis revealed similarity to allow for effect. Nested an additional menu-independence axiom. ...

a nested polymerase chain reaction (pcr) assay with two pairs of primers was applied for the detection of m. tuberculosis complex dna in specimens of 51 patients. of these, 31 clinically diagnosed patients (group i) recruited from july 1996 to june 1997 were given antituherculous chemotherapy from one to six months with standard daily regimen (isaniazid, 5 mg/kg; rifampin, 10 mg/kg; pyrazinamit...

This paper addresses the design of stabilizing controllers for a nested control system where the controller is realized in a distributed manner, considering uncertainty not only in the controller-to-plant and plant-to-controller channels but also in the nest-to-nest, subcontroller-to-subcontroller communication. An input-output approach is taken. Two appropriate controller architectures that st...

In this paper a hybrid observer for hybrid systems is presented. The continuous time and the discrete event dynamics are determined in such a way that the observation problem is solved. The observer is built using a nested structure, in which the nesting is due to a refinement of those states corresponding to undecided cases. The continuous dynamics implement an estimator which extracts extra i...