Browse All Digital Items

First-order methods for convex and nonconvex optimization have been an important research topic in the past few years. This talk studies and develops efficient algorithms of first-order type, to solve a variety of problems. We first focus on the widely studied gradient-based methods in composite convex optimization problems that arise extensively in compressed sensing and machine learning.

Traditional methods of analyzing questions and answers as they occur in reference libraries are discussed and criticized. Methods are evaluated. A pragmatic scheme is suggested which classifies answers by their formats, dividing them into exact reproduction type, fill-in-the-blank type, short descriptive type, information-about type, and list-of-references types.

A general discussion of the principles of simulation is given, with emphasistoward an information retrieval system. The design of FOSSAL, the simulation model, is studied, with particular attention paid to the concept of programmable variables. An explanation is given for the use of each sampling distribution and all related data. It is concluded that FOSSAL is extremely useful in helping a designer to evaluate an on-line real-time information retrieval system which has its information stored on a tape or disk subsystem.

In general, problems are solvable along a continuum of abstraction. There is, at any given point in the development of the solution, a most efficient or optimum strategy. In information retrieval systems the ultimate solution is obtained at a more specific rather than at a more abstract level. An online computer program called GRINS is described which implements the information specialist's role in the negotiating of a user's need. The structure of the program is modular so that improvements may be easily made. Some improvements are suggested.

A disc-oriented processor for programs written in the FORTRAN IV language has been developed for the General Electric Model 225 computer at Lehigh University. The processor is an outgrowth of a tape-oriented system distributed by General Electric. The disc system has been shown to compile and execute FORTRAN IV programs in as little as 23% of the time required by the tape system.

This thesis was undertaken with the idea that there is a relationship between the level of technicality of a scientific paper and the style in which it is written, in particular, with respect to vocabulary and grammatical complexity. The newest area of interest is computational linguistics. Most work is in anlysis of syntactic structures and the construction of grammars.

Theoretical concepts underlying information systems are analyzed. The study is in general oriented towards computer-based, large capacity IS. An attempt has been made to identify the distinguishible elements of IS domain and establish interrelationships between them. Some current IS theories are evaluated.

Objectives of the development of the simulation are: a. To develop a model for the operation of an existing automatic punch press line, b. To write a program for the LGP-30 Digital Computer, c. To analyze the program and the model.

A study is presented of the potentials of a new proposed type of superconductor memory scheme using individual fluxoids to store binary information. Two different superconducting memory schemes are presented: 1) similar to the T-bar structure used in bubble technology, and 2) a completely new memory scheme.

This work focuses on developing optimization models and algorithms to solve problems in electricity networks and renewable energy. The steady rise of electricity demand in the world, along with the deployment of volatile renewable energy resources in greater quantities, will require many researchers, policymakers, and other stakeholders in the field of power management to understand these challenges and use new methods, approaches and technologies to modernize the electric grid.

The factors for converting a batch-processing, tape-oriented document reference system to an-on-line, real-time system are discussed. The factors analyzed are file structures, file addressing, file maintenance, communication, scheduling, and modular programming structures. The levels of design for the individual factors are illustrated in order to show the complexities of conversion to an on-line, real-time system.

In 1919 the War Chest, which centralized funding for a variety of domestic and international aid organizations, was reorganized as the Central Council for Social Services and Community Chest in Bethlehem, Pennsylvania. These organizations attempted to unite social work within the city but were controlled by executive boards that opposed centralized control over the numerous private philanthropic organizations. Dr. William Estes, of St.

This paper divides heuristic methods into three types: (1) those which select methods, (2) those which select nodes, and (3) those which use models. The problems pertaniing to the use of each type of heuristic method during problem-solving are examined.

The basic objective of this investigation is to provide a method for quantitatively analyzing the effect of autmation on the staff time requrements of a university library circulation system. This is accomplished by characterizing the various levels of sophistication in circulation systems in terms of the degree of automation involved, and then analyzing the components of existing circulation systems at each level of automation.

Many recent studies have attempted to investigate the behavioral aspects ofthe information gathering process. Generally, these studies have developed an insight into the ways by which scientists obtain information, and have developed the methodology for such studies. A number of studies have also sought to determine the actual information needs of scientists.