ON THE LOGIC OF GENERALIZED HYPERTEXT

Hypertext is one of those neat ideas in computing that periodically burst upon the scene, quickly demonstrating their usefulness and gaining widespread acceptance. As interesting, useful and exciting as hypertext is, the concept has certain problems and limitations, many of which are widely recognized. In this paper we describe what we call basic hypertext and we present a logic model for it. Basic hypertext should be thought of as a rigorously-presented approximation of first-generation hypertext concepts. Following our discussion of basic hypertext, we present our concept of generalized hypertext, which is aimed at overcoming certain of the limitations of basic hypertext and which we have implemented in a DSS shell called Max. We then present a logic model for browsing in generalized hypertext.Information Systems Working Papers Serie

On the Logic of Generalized Hypertext

Hypertext is one of those neat ideas in computing that periodically burst upon the scene, quickly demonstrating their usefulness and gaining widespread acceptance. As interesting, useful and exciting as hypertext is, the concept has certain problems and limitations, many of which are widely recognized. In this paper we describe what we call basic hypertext and we present a logic model for it. Basic hypertext should be thought of as a rigorously-presented approximation of first-generation hypertext concepts. Following our discussion of basic hypertext, we present our concept of generalized hypertext, which is aimed at overcoming certain of the limitations of basic hypertext and which we have implemented in a DSS shell called Max. We then present a logic model for browsing in generalized hypertext

An intelligent sketchpad : a gestural language for denoting temporal relations in dynamic design

Thesis (M.S.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1993.Includes bibliographical references (leaves 65-71).by Karen Donoghue.M.S

ON THE LOGIC OF GENERALIZED HYPERTEXT

Hypertext is one of those neat ideas in computing that periodically burst upon the scene, quickly demonstrating their usefulness and gaining widespread acceptance. As interesting, useful and exciting as hypertext is, the concept has certain problems and limitations, many of which are widely recognized. In this paper we describe what we call basic hypertext and we present a logic model for it. Basic hypertext should be thought of as a rigorously-presented approximation of first-generation hypertext concepts. Following our discussion of basic hypertext, we present our concept of generalized hypertext, which is aimed at overcoming certain of the limitations of basic hypertext and which we have implemented in a DSS shell called Max. We then present a logic model for browsing in generalized hypertext.Information Systems Working Papers Serie

A documentation paradigm for an integrated software maintenance support environment

Recent advances in computer hardware have not been matched by comparable advances in computer software, inhibiting the production of reliable software at greater levels of productivity. Development of software is restricted by the so-called "maintenance backlog". Productivity in the maintenance sector has not kept pace with increasing annual labour costs, making the maintenance of software the major item in the budget, of organisations responsible for the development and maintenance of software. Gains in productivity can be anticipated by the exploitation of software-maintenance tools, within the framework of an Integrated .Software Maintenance Support Environment (ISMSE). for which a high-level design has been proposed in this thesis, offering comprehensive support for all phases of the software life-cycle, particularly the maintenance phase. A key factor in the reliable modification of software is the time taken to gain the prerequisite understanding, by a study of the system's documentation. This documentation degrades over a period of time, becoming unreliable, inhibiting maintenance of the software, which may be a large capital asset, ultimately, the software may become impossible to maintain, requiring replacement. Understanding gained during maintenance is wide-ranging and at various levels of abstraction, but is often NOT well-recorded, since no effective documentation system exists for recording the maintenance history of large software systems. The documentation paradigm in this thesis, used within the framework of an ISMSE, aims to provide a means of recording the knowledge gained during maintenance, facilitating easier future maintenance, and preserving the reliability of the documentation, so reducing the time required to gain an understanding of the software being maintained. This provides a powerful means of increasing productivity, while simultaneously preserving a valuable capital asset

The Cost of Requiring Charities to Report Financial Information

Taxes and regulations, such as labor laws and reporting requirements, often exempt small firms, creating incentives to stay small or delay growth. Firms' responses to such size thresholds provide an opportunity to empirically assess consequences of regulations and firms' willingness to pay to avoid them. This paper provides a theoretical model for evaluating welfare effects of moving such thresholds. It then analyzes an income notch at which IRS reporting requirements for charitable organizations become more onerous. Standard bunching estimates imply that the average charity will reduce reported income by $750 to$1000 to avoid filing the more onerous information return. Panel data methods show that an even larger share of charities fail to appear when first required to report more information. There is some evidence of retiming of income to delay growing above the notch, but a long-run reduction in the share that grow above the notch provides evidence of real responses as well. Relatively low-expense and low-asset charities are most likely to reduce reported income to stay below the notch, while charities with past receipts above the notch do not manipulate income, suggesting the report imposes an adjustment cost on new filers

Thermofluid optimisation of turboexpanders for mobile organic Rankine cycle systems

The Organic Rankine Cycle (ORC) is a closed-loop thermodynamic cycle used for low-temperature heat recovery, from sources as diverse as solar, geothermal and industrial processes. Within the ORC, power is produced with the use of a dense-gas vapour expansion in a suitable device and the efficiency of this process is a key influence on cycle efficiency. This thesis therefore investigates the design, optimisation and validation of nozzled radial-inflow turboexpanders, applied to the recovery of vehicle exhaust waste heat. A 1-dimensional meanline performance prediction methodology is developed, capable of modelling the real-gas effects prevalent in dense, organic working fluids. In addition, choking effects within flow passages are explicitly accounted for in both nozzle and rotor, allowing accurate prediction at the high Pressure Ratios typically observed in ORC expanders. A validation case is subsequently presented, tuning loss correlation coefficients to match 6 high Pressure Ratio experimental test cases, reducing average mass flow rate and efficiency errors to 1.33% and 2.04%, respectively. This 1D model is used to create a methodology in which expander optimisation is performed across an entire vehicle duty cycle. A discretised heat exchanger model is developed, capable of modelling multiple fluid phases and real gas effects. A number of simplifications including surrogate models generated by neural network fits, lead to an O(10^3) reduction in computing effort. A case study is performed to quantify benefits to a 11.7 L diesel engine running a 1200-point Non-Road Transient Cycle, resulting in a 21.9% improvement in total cycle energy recovery against a single-point baseline case. The methodologies contained within this thesis are used to design a turboexpander for an industrial research project, focusing on a 15 L diesel Tier 4 engine. Across two generations of design, a combination of computational and experimental methods are applied to produce an expander containing non-radial rotor inlet blading, producing a simulated power output of 12.4 kW at the design point. Finally, in order to facilitate validation of real-gas Computational Fluid Dynamics (CFD) simulations and better understand the underlying flow physics, a blowdown facility is constructed for working fluid r1233zd(E), centred around a converging-diverging test section producing a Mach 2 expansion at the exit plane. Comparison of CFD and centreline pressure measurements for both nitrogen and refrigerant produced maximum errors in Pressure Ratio of 5.7% and 12.1% respectively, suggesting an overestimation by computational methods in predicting expander output power. The methodologies, designs and experimental results contained within this thesis provide improvements to the modelling, optimisation and validation of dense-gas turboexpanders, with the aim of improving design processes and aiding the implementation of ORC for vehicle waste heat recovery.Open Acces

Proceedings videojogos 2020

The 12th Edition of the International Conference on Videogame Sciences and Arts, Videojogos2020, is a joint organization of the School of Public Management, Communication and Tourism – Polytechnic Institute of Bragança (EsACT – IPB) and the Portuguese Society of Videogames Sciences (SPCV). This year, due to the pandemic context, activities were conducted online.info:eu-repo/semantics/publishedVersio