A series of three laboratory experiments were conducted to assess the influence of graphical and color-enhanced information presentation modes on decision quality, decision making time, use of information, and user perceptions. The experimental design allowed for the unconfounded study of line graphs and color using a variety of information presentation designs for the same decision making task. Based on the findings of these studies, propositions about the impact of graphics and color on individual decision makers are presented. The influence of presentation mode on human performance and the perceived value of information is related to how well it supports the solution approach to a particular task. The benefits of graphics are limited to reducing decision making time but only when the graphical report has been designed to directly assist in solving the task. Multicolor reports aid in decision making, but only in specific circumstances, that is, their benefits are not pervasive. It appears that color is more advantageous when associated with graphical reports, for certain decision maker types, during learning periods, and in time constrained environments.
Architecture and Hardware
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Spreadsheet calculations of probabilities from the F, t, χ2, and normal distribution
By computing probabilities from the normalization of the F distribution (instead of by numerical integration methods), statistical capabilities in spreadsheet operations can be greatly expanded and enhanced.
A self-assessment procedure dealing with computer organization and logic design
Min-max heaps and generalized priority queues
A simple implementation of double-ended priority queues is presented. The proposed structure, called a min-max heap, can be built in linear time; in contrast to conventional heaps, it allows both FindMin and FindMax to be performed in constant time; Insert, DeleteMin, and DeleteMax operations can be performed in logarithmic time. Min-max heaps can be generalized to support other similar order-statistics operations efficiently (e.g., constant time FindMedian and logarithmic time DeleteMedian); furthermore, the notion of min-max ordering can be extended to other heap-ordered structures, such as leftist trees.
Computer networks are becoming more numerous and more diverse. Collectively, they constitute a worldwide metanetwork.
Accessing bit fields in FORTRAN-77
By incorporating bit-manipulation routines into Fortran-77, it is now possible to manipulate bits or partial word operands without having to write assembly-coded subroutines. Because the routines are now acceptable to Fortran-77 compilers, the accessing code is now portable to other Fortran Machines.
Microprocessor architectures: a comparison based on code generation by compiler
By carefully tuning computer and compiler, it is possible to avoid the otherwise inevitable compromises between complex compiling algorithms and less-than-optimal compiled code, where the key to performance appears to lie neither in sophisticated nor drastically reduced architectures, but in the key concepts of regularity and completeness.
Evaluating two massively parallel machines
Two radically different parallel computers prompt a debate about the best parallel architectures and may mark the commercial viability of parallelism on the supercomputer scale.
Comments on “Grosch’s law re-revisited: CPU power and the cost of computation”
Taking Ein-Dor's recent reevaluation of Grosch's law one step further, the authors find evidence of different slopes for different classes of computers and the utility of an additional variable: the IBM or IBM-compatible factor. The analysis indicates that Grosch's law no longer applies to minicomputers.
Toward real-time performance benchmarks for Ada
Benchmarks are developed to measure the Ada notion of time, the Ada features believed important to real-time performance, and other time-related features that are not part of the language, but are part of the run-time system; these benchmarks are then applied to the language and run-time system, and the results evaluated.
Computerized performance monitoring systems: use and abuse
An exploratory study of computerized performance monitoring and control systems reveals both positive and negative effects. Responses of 50 clerical workers from 2 organizations with computerized monitoring were compared to 94 individuals from 3 organizations in similar jobs without computerized monitoring. The results indicate that computerized monitoring is associated with perceived increases in office productivity, more accurate and complete assessment of workers' performance, and higher levels of organizational control. Respondents indicate that managers overemphasize the importance of quantity and underemphasize the importance of quality in evaluating employee performance. Workers perceive increased stress, lower levels of satisfaction, and a decrease in the quality of their relationships with peers and management as a consequence of computerized monitoring. The relevance of existing models of performance monitoring is examined in light of these findings.
Software development of real-time systems
Concentrating on those aspects of software development peculiar to real-time systems, this collection of development methods and tools emphasizes incremental development; the testing of tusk interfaces during integration testing, as well as unit and partial integration testing on the development system; and the development of automated tools to assist in the testing process.
Computer instruction set usage by programmers: an empirical investigation
The elimination of unused instruction sets would encourage more uniform programming practices and could allow the inclusion of more useful instructions.
The results of a user questionnaire are used to determine the effects of 17 different independent variables on user satisfaction.
Factory automation and robotics
Selected from papers presented at the Symposium on Factory Automation and Robotics held September 9-11, 1985, at New York University
Impact of the technological environment on programmer/analyst job outcomes
Recent research has shown that key DP/IS personnel job outcomes (e.g., turnover, organizational commitment, job satisfaction) are affected by job design, leadership characteristics, and role variables. This study investigates another class of variables, the technological environment faced by DP/IS personnel, that might impact these job outcomes. The technological environment includes (1) development methodologies employed, (2) project teams and reporting relationships, and (3) work characteristics. Variables from all classes were found to impact DP/IS job outcomes. Over 11 percent of the variance in DP/IS job satisfaction is explained by these variables.
Research on legged machines can lead to the construction of useful legged vehicles and help us to understand legged locomotion in animals.
The impact of robotics on computer science
The rapid development of robotics and the resulting need for computer scientists to be better trained in traditional mathematics necessitate changes in computer science curricula.
Opportunities for research on numerical control machining
Numerical control (NC) machining could be reinvigorated by adapting robotic software technology. Regrettably, pressures are mounting in industry to constrain robots to NC standards, and the academic community views NC as an obsolete, solved problem, with little remaining scholarly challenge. Grossman examines the current status of APT, an NC language, and proposes the merging of APT with a modern robotics language.
Embedded menus: selecting items in context
In many situations, embedded menus represent an attractive alternative to the more traditional explicit menus, particularly in touchtext, spelling checkers, language-based program editors, and graphics-based systems.
The structure of microcomputer file systems
With an understanding of the structure of microcomputer file systems and what causes incompatibilities between them, it is possible to write software that will enable one system to read files written by another—provided they have physically compatible hardware.
Andrew: a distributed personal computing environment
The Information Technology Center (ITC), a collaborative effort between IBM and Carnegie-Mellon University, is in the process of creating Andrew, a prototype computing and communication system for universities. This article traces the origins of Andrew, discusses its goals and strategies, and gives an overview of the current status of its implementation and usage.
How not to lie with statistics: the correct way to summarize benchmark results
Using the arithmetic mean to summarize normalized benchmark results leads to mistaken conclusions that can be avoided by using the preferred method: the geometric mean.
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