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The Conference of Professors of Computer Science (CPCS), in conjunction with the British Computer Society, selects annually for publication a few of the best British PhD dissertations in computer science. Its aim is to make more visible the significant British contribution to this field, and to provide a model for future students. At most three or four dissertations are selected for publication each year. They have a high standard of exposition and place results particularly clearly in the context of computer science. Computer scientists with significantly different interests will be able to grasp the essentials of each book and use it as a means of entry to an unfamiliar research topic.

Project Factorisations in Partial Evaluation

John Launchbury

John Launchbury

Distinguished Dissertations in Computer Science (No. 1)

**Print Publication Year:** 1991

**Print ISBN:** 9780521414975

**Online Publication Date:** August 2010

**Online ISBN:** 9780511569814

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511569814

A partial evaluator is a function that takes a program, together with some of the input to the program, and produces a new program as a result. This new program is an optimized version of the old, having taken the input data into account. Prior to partial evaluation, the input program undergoes analysis. This binding-time analysis discovers which values within the program may be computed during partial evaluation--the static values--and which may not--the dynamic values. Partial evaluation has recently become the focus of attention for a rapidly increasing number of researchers because of its potential for global program optimization. It provides a detailed introduction and proceeds to a mathematical treatment of the technique. It is relevant to people interested in automatic program transformation, program optimization, compilers, program analysis, and theoretical computer science. This is the first complete book on the subject of partial evaluation.

Three-Dimensional Integrated Circuit Layout

A. C. Harter

A. C. Harter

Distinguished Dissertations in Computer Science (No. 2)

**Print Publication Year:** 1991

**Print ISBN:** 9780521416306

**Online Publication Date:** May 2010

**Online ISBN:** 9780511666384

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511666384

The theory and design of integrated circuits has moved forward in leaps and bounds in recent years. This book concentrates on the design of three-dimensional, rather than traditional two-dimensional, circuits. The theory behind such circuits, together with experimental results, are presented in detail.

Logic Programming

**Operational Semantics and Proof Theory**

James H. Andrews

James H. Andrews

Distinguished Dissertations in Computer Science (No. 4)

**Print Publication Year:** 1992

**Print ISBN:** 9780521432191

**Online Publication Date:** November 2009

**Online ISBN:** 9780511526534

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511526534

Dr Andrews here provides a homogeneous treatment of the semantics (operational and logical) of both theoretical and practical logic programming languages. He shows how the rift between theory and practice in logic programming can be bridged. This is achieved by precisely characterizing the way in which 'depth-first' search for solutions to a logical formula - the usual strategy in most practical languages - is incomplete. Languages that perform 'breadth-first' searches reflect more closely the theory underlying logic programming languages. Researchers interested in logic programming or semantics, as well as artificial intelligence search strategies, will want to consult this book as the only source for some essential and new ideas in the area.

Efficient Algorithms for Listing Combinatorial Structures

Leslie Ann Goldberg

Leslie Ann Goldberg

Distinguished Dissertations in Computer Science (No. 5)

**Print Publication Year:** 1993

**Print ISBN:** 9780521450218

**Online Publication Date:** January 2010

**Online ISBN:** 9780511569913

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511569913

This thesis is concerned with the design of efficient algorithms for listing combinatorial structures. The research described here gives some answers to the following questions: which families of combinatorial structures have fast computer algorithms for listing their members, What general methods are useful for listing combinatorial structures, How can these be applied to those families that are of interest to theoretical computer scientists and combinatorialists? Among those families considered are unlabeled graphs, first-order one properties, Hamiltonian graphs, graphs with cliques of specified order, and k-colorable graphs. Some related work is also included that compares the listing problem with the difficulty of solving the existence problem, the construction problem, the random sampling problem, and the counting problem. In particular, the difficulty of evaluating Polya's cycle polynomial is demonstrated.

Specification and Proof in Real Time CSP

Jim Davies

Jim Davies

Distinguished Dissertations in Computer Science (No. 6)

**Print Publication Year:** 1993

**Print ISBN:** 9780521450553

**Online Publication Date:** August 2010

**Online ISBN:** 9780511569760

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511569760

Computing systems are becoming highly complex, harder to understand, and therefore more prone to failure. Where such systems control aircraft for example, system failure could have disastrous consequences. It is important therefore that we are able to employ mathematical techniques to specify the behavior of critical systems. This thesis uses the theory of Communicating Sequential Processes to show how a real-time system (a system that maintains a continuous interaction with its environment) may be specified. Included is a case study in which a local area network protocol is described at two levels of abstraction, and a general method for structuring CSP descriptions of layered protocols is given. The research contained here represents the very latest work on the specification and verification of real-time systems.

Qualified Types

**Theory and Practice**

Mark P. Jones

Mark P. Jones

Distinguished Dissertations in Computer Science (No. 9)

**Print Publication Year:** 1994

**Print ISBN:** 9780521472531

**Online Publication Date:** May 2010

**Online ISBN:** 9780511663086

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511663086

This book describes the use of qualified types to provide a general framework for the combination of polymorphism and overloading. For example, qualified types can be viewed as a generalization of type classes in the functional language Haskell and the theorem prover Isabelle. These in turn are extensions of equality types in Standard ML. Other applications of qualified types include extensible records and subtyping. Using a general formulation of qualified types, the author extends the Damas/Milner type inference algorithm to support qualified types, which in turn specifies the set of all possible types for any term. In addition, he describes a new technique for establishing suitable coherence conditions that guarantee the same semantics for all possible translations of a given term. Practical issues that arise in concrete implementations are also discussed, concentrating in particular on the implementation of overloading in Haskell and Gofer, a small functional programming system developed by the author.

Affine Analysis of Image Sequences

Larry S. Shapiro

Larry S. Shapiro

Distinguished Dissertations in Computer Science (No. 10)

**Print Publication Year:** 1995

**Print ISBN:** 9780521550635

**Online Publication Date:** December 2009

**Online ISBN:** 9780511526657

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511526657

Computer vision is a rapidly growing field which aims to make computers 'see' as effectively as humans. In this book Dr Shapiro presents a new computer vision framework for interpreting time-varying imagery. This is an important task, since movement reveals valuable information about the environment. The fully-automated system operates on long, monocular image sequences containing multiple, independently-moving objects, and demonstrates the practical feasibility of recovering scene structure and motion in a bottom-up fashion. Real and synthetic examples are given throughout, with particular emphasis on image coding applications. Novel theory is derived in the context of the affine camera, a generalisation of the familiar scaled orthographic model. Analysis proceeds by tracking 'corner features' through successive frames and grouping the resulting trajectories into rigid objects using new clustering and outlier rejection techniques. The three-dimensional motion parameters are then computed via 'affine epipolar geometry', and 'affine structure' is used to generate alternative views of the object and fill in partial views. The use of all available features (over multiple frames) and the incorporation of statistical noise properties substantially improves existing algorithms, giving greater reliability and reduced noise sensitivity.

A Compositional Approach to Performance Modelling

Jane Hillston

Jane Hillston

Distinguished Dissertations in Computer Science (No. 12)

**Print Publication Year:** 1996

**Print ISBN:** 9780521571890

**Online Publication Date:** November 2009

**Online ISBN:** 9780511569951

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511569951

This is the first book presenting a stochastic extension of process algebra, PEPA; this is shown to be suitable for specifying a Markov process, which can then be applied to performance modelling. The method, which is illustrated with case studies taken from the area of communication systems, can readily be used to construct a variety of models that can be analysed using standard numerical techniques. One of the major advantages of PEPA over the standard methods for specifying stochastic performance models is the inherent apparatus for reasoning about the structure and behaviour of models. In the later chapters this apparatus is exploited to define four equivalence relations over PEPA components. Each of these notions of equivalence has intrinsic interest from a process algebra perspective. However, they are also demonstrated to be useful in a performance modelling context. To conclude the book, a section has been added surveying recent results in the area and discussing open questions.

The Map-Building and Exploration Strategies of a Simple Sonar-Equipped Mobile Robot

**An Experimental, Quantitative Evaluation**

D. C. Lee

D. C. Lee

Distinguished Dissertations in Computer Science (No. 13)

**Print Publication Year:** 1996

**Print ISBN:** 9780521573313

**Online Publication Date:** March 2012

**Online ISBN:** 9780511526640

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511526640

There are two radically different approaches to robot navigation: the first is to use a map of the robot's environment; the second uses a set of action reflexes to enable a robot to react rapidly to local sensory information. Hybrid approaches combining features of both also exist. This book is the first to propose a method for evaluating the different approaches that shows how to decide which is the most appropriate for a given situation. It begins by describing a complete implementation of a mobile robot including sensor modelling, map–building (a feature–based map and a grid–based free–space map), localisation, and path–planning. Exploration strategies are then tested experimentally in a range of environments and starting positions. The author shows the most promising results are observed from hybrid exploration strategies which combine the robustness of reactive navigation and the directive power of map–based strategies.

Axiomatic Domain Theory in Categories of Partial Maps

Marcelo P. Fiore

Marcelo P. Fiore

Distinguished Dissertations in Computer Science (No. 14)

**Print Publication Year:** 1996

**Print ISBN:** 9780521571883

**Online Publication Date:** November 2009

**Online ISBN:** 9780511526565

**Book DOI:** http://dx.doi.org/10.1017/CBO9780511526565

Axiomatic categorical domain theory is crucial for understanding the meaning of programs and reasoning about them. This book is the first systematic account of the subject and studies mathematical structures suitable for modelling functional programming languages in an axiomatic (i.e. abstract) setting. In particular, the author develops theories of partiality and recursive types and applies them to the study of the metalanguage FPC; for example, enriched categorical models of the FPC are defined. Furthermore, FPC is considered as a programming language with a call-by-value operational semantics and a denotational semantics defined on top of a categorical model. To conclude, for an axiomatisation of absolute non-trivial domain-theoretic models of FPC, operational and denotational semantics are related by means of computational soundness and adequacy results. To make the book reasonably self-contained, the author includes an introduction to enriched category theory.

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