Technology Related Trust Issues

2011 ◽  
pp. 150-167
Keyword(s):  
System Performance ◽  
Web Interface ◽  
Security Authentication ◽  
Policies And Procedures ◽  
Proposed Model ◽  
Interface System

The technology-related trust issues hypothesized in the proposed model include security, authentication, confidentiality, non-repudiation, web interface, system performance and technology-related policies and procedures. These issues can be addressed by maintaining high levels of assurance with respect to various technologies discussed in the previous chapter. As is evident from the earlier discussions, most of these technologies are inter-related and have the potential to address more than one such issue. Based on the levels of assurance in respect of the relevant technologies, an attempt has been made to assess the level of assurance with regard to each of these technology related trust issues. This chapter presents an analysis of the assessment of these levels of assurance.

Optimizing geometric design of roundabouts: multi-objective analysis

2006 ◽  
Vol 33 (1) ◽  
pp. 29-40 ◽  
Author(s):  
Atif Mehmood ◽  
Said M Easa
Keyword(s):  
Traffic Safety ◽  
System Performance ◽  
Operational Efficiency ◽  
Geometric Design ◽  
Proposed Model ◽  
Design Consistency ◽  
A Minor ◽  
Optimum Solution ◽  
Curve Radius ◽  
Gis Software

The main objectives of roundabout design are to maximize traffic safety and operational efficiency. Traditionally, because of the complexity of the system and the multiple objectives involved, the design process is iterative and time-consuming. A minor change in the geometry can result in significant changes in the system performance (operation and safety). This paper presents an optimization model that directly provides the roundabout geometry that optimizes two objectives: design consistency and operational efficiency. Design consistency is represented by the mean difference in operating speeds for various conflicting vehicle paths and operational efficiency is represented by the average roundabout delay. Vehicle paths (through, right, and left) and roundabout delay are modeled for all roundabout approaches. The input geometric data to the model can be easily obtained from an aerial photograph of the selected site using a geographic information systems (GIS) software. The system performance is optimized subject to geometric and traffic constraints. The proposed model is applicable to single-lane roundabouts (urban and rural) with four legs intersecting at right angles. Application of the model to an actual proposed roundabout site is presented. This proposed approach provides the optimum solution directly and is also more efficient than the traditional iterative approach. Key words: geometric design, roundabouts, horizontal curve, radius, optimization, consistency, capacity, traffic delay.

Extenics Decision Model for Evaluating Mechanical Joint Interface of Reconfigurable Machine Tools

2011 ◽  
Vol 311-313 ◽  
pp. 1972-1976
Author(s):  
Li Mei Ma ◽  
Jian Yong Li ◽  
Wen Sheng Xu ◽  
Ding Lei Wang
Keyword(s):  
Machine Tools ◽  
Decision Model ◽  
Element Model ◽  
Performance Criteria ◽  
Joint Interface ◽  
Mechanical Joint ◽  
Proposed Model ◽  
Interface System ◽  
Evaluation Approaches ◽  
The Relationship

In Reconfigurable machine tools (RMTs), the reconfiguration only occurs at the mechanical interface system composed of mechanical modules, joining mechanisms, or adapter mechanisms, and their reconfigurability degree depends strongly on the properties of its module interfaces. This paper investigates the performance criteria influencing the reconfigurability of module joint interfaces. An Extenics Element Model (EEM) method is proposed to model the component module of RMTs, module interfaces and the relationship between mechanical modules. Furthermore, the evaluation values are determined based on the Simple Dependent Function (SDF) to evaluate the reconfigurability of different joint interfaces. Finally, two types of joint interfaces between worktable and slide are presented to verify the proposed model and evaluation approaches.

Conceptual Model to Support Systematic Use of Performance Measures in State Transportation Agencies

2000 ◽  
Vol 1706 (1) ◽  
pp. 64-72 ◽  
Author(s):  
Malcolm E. Baird ◽  
Robert E. Stammer
Keyword(s):  
Conceptual Model ◽  
Performance Measures ◽  
Measurement System ◽  
System Performance ◽  
Program Performance ◽  
Proposed Model ◽  
Limited Experience ◽  
Beneficial Uses ◽  
Comprehensive Measurement ◽  
Transportation Agencies

State transportation agencies (STAs) have significant experience in measuring many different aspects of transportation system performance, but they have very limited experience in measuring the performance of the STA as an organization or the performance of programs for which the STA is responsible. Based on research of organizational and program performance measures, a conceptual model to help STAs develop and implement a comprehensive measurement system is proposed. The proposed model helps define the various types of performance measures and illustrates the interrelationships. Examples are offered for each type of measure. The model is flexible and can be adapted to fit unique circumstances and priorities and to focus on the aspects of performance that are most important to a particular organization. After the model and accompanying typology are explained, the utility of the model is described, with examples of beneficial uses.

Modelling Approach for a Hydrolysis Reactor for the Ammonia Production in Maritime SCR Applications

2017 ◽  
Author(s):  
Katrin Johe ◽  
Thomas Sattelmayer
Keyword(s):  
System Performance ◽  
Catalytic Reduction ◽  
Ammonia Concentration ◽  
Operating Conditions ◽  
Urea Solution ◽  
Step Method ◽  
Proposed Model ◽  
Theoretical Predictions ◽  
Critical Process ◽  
Modelling Approach

The catalytic generation of ammonia from a liquid urea solution is a critical process determining the performance of SCR (Selective Catalytic Reduction) systems. Solid deposits on the catalyst surface from the decomposition of urea have to be avoided, as this leads to reduced system performance or even failure. At present, reactor design is often empirical, which poses a risk for costly iterations due to insufficient system performance. The presented research project proposed a performance prediction and modelling approach for SCR hydrolysis reactors generating ammonia from urea. Different configurations of hydrolysis reactors were investigated experimentally. Ammonia concentration measurements provided information about parameters influencing the decomposition of urea and the system performance. The evaporation of urea between injection and interaction with the catalyst was identified as the critical process driving the susceptibility to deposit formation. The spray of urea solution was characterised in terms of velocity distribution by means of particle-image velocimetry. Results were compared with theoretical predictions and calculation options for processes in the reactor were determined. Numerical simulation was used as an additional design and optimisation tool of the proposed model. The modelling approach is presented by a step-by-step method which takes into account design constraints and operating conditions for hydrolysis reactors.

Dynamic Modeling and Analysis of the Boring Machining System

1987 ◽  
Vol 109 (3) ◽  
pp. 219-226 ◽  
Author(s):  
G. M. Zhang ◽  
S. G. Kapoor
Keyword(s):  
Dynamic Modeling ◽  
Dynamic Characteristics ◽  
System Performance ◽  
Analytical Form ◽  
System Response ◽  
Modeling And Analysis ◽  
State Variable ◽  
Proposed Model ◽  
Machining System ◽  
Variable Space

A system of model formulated in the state variable space is proposed to describe the dynamic characteristics of the boring machining system. Particular attention is paid to the effect of the tangential vibration on the system performance. Modal analysis in the eigenvector space is employed to derive the analytical form of the system response. Experiments are carried out under spiral cutting conditions and the critical cutting stiffness predicted by the proposed model is compared with corresponding measured values, showing good agreements.

aiNet

Data Mining ◽  
2011 ◽  
pp. 231-260 ◽  
Author(s):  
Leandro Nunes de Castro ◽  
Fernando J. Von Zuben
Keyword(s):  
Data Analysis ◽  
Network Performance ◽  
Document Retrieval ◽  
Benchmark Problems ◽  
Data Sets ◽  
Proposed Model ◽  
Artificial Immune Network ◽  
Immune Network Model ◽  
Clustering Approach

This chapter shows that some of the basic aspects of the natural immune system discussed in the previous chapter can be used to propose a novel artificial immune network model with the main goals of clustering and filtering crude data sets described by high-dimensional samples. Our aim is not to reproduce with confidence any immune phenomenon, but demonstrate that immune concepts can be used as inspiration to develop novel computational tools for data analysis. As important results of our model, the network evolved will be capable of reducing redundancy and describing data structure, including their spatial distribution and cluster interrelations. Clustering is useful in several exploratory pattern analyses, grouping, decision-making and machine-learning tasks, including data mining, knowledge discovery, document retrieval, image segmentation and automatic pattern classification. The data clustering approach was implemented in association with hierarchical clustering and graphtheoretical techniques, and the network performance is illustrated using several benchmark problems. The computational complexity of the algorithm and a detailed sensitivity analysis of the user-defined parameters are presented. A trade-off among the proposed model for data analysis, connectionist models (artificial neural networks) and evolutionary algorithms is also discussed.

scholarly journals The relationship between high performance work system (HPWS), psychological empowerment (PE) and service employees’ performance (SEP): Evidence from automotive retail industry

2021 ◽  
pp. 1913-1918
Author(s):  
Rashida Mat Rani ◽  
Normy Rafida Abdul Rahman ◽  
Nurul Aqilah Mohd Yusak
Keyword(s):  
High Performance ◽  
Service Industry ◽  
Psychological Empowerment ◽  
Retail Industry ◽  
Service Employees ◽  
Work System ◽  
Performance Expectation ◽  
Policies And Procedures ◽  
Proposed Model ◽  
High Performance Work System

The study investigated the effect of psychological empowerment (PE) in between the High Performance Work System (HPWS) and Service Employees Performance (SEP) in the Automotive Retail Industry of Malaysia. We developed and examined a mediation model linking perceived-HPWS to SEP and PE plays as a mediator. From the self-determination theory, defined motivation as being intrinsic and extrinsic, whether PE enables the employees meeting the performance expectation. The proposed model can be substantiated wide data collection and data analysis. The research data are collected from a sample of 72 employees through a questionnaire. The findings suggest that the PE is a significant influence on SEP. It is expected that the findings of this study will guide Human Resource (HR) Practitioners to establish appropriate policies and procedures for effective HR practices to be deployed in the organization especially in the service industry environment.

scholarly journals Development of an Academic Risk Model to support Higher Education Quality Assurance

2020 ◽  
Author(s):  
Paul O'Leary ◽  
T.J. McDonald ◽  
Derek O'Byrne ◽  
Chris O'Riordan
Keyword(s):  
Higher Education ◽  
Decision Making ◽  
Quality Assurance ◽  
Risk Model ◽  
Academic Risk ◽  
Academic Activities ◽  
Policies And Procedures ◽  
Proposed Model ◽  
Higher Education Quality ◽  
Education Quality Assurance

This paper presents a model of risk management in higher education, to support the quality assurance framework and the activities, more generally, of a Higher Education Institute. Its purpose is to define the Institute’s approach to academic risk and its management and to inform decision-making. Academic risk is defined and contextualized in terms of published literature. Decision-making and judgement is at the centre of all academic activities and accordingly inherent risk will always exist, through the exercise of judgement, the operation of academic policies and procedures and through compliance. A normative model of academic risk assessment is proposed, based on three levels: isolated academic risk, repeated academic risk and systemic academic risk. This is followed by a proposed model for action according to the level of risk. Finally the operation of the model in our higher education institute is presented.

scholarly journals Appraisal of Super-Fast Membrane Bioreactors by MASM—A New Activated Sludge Model for Membrane Filtration

Water ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 1963
Author(s):  
Derin Orhon ◽  
Ayse Begum Yucel ◽  
Güçlü Insel ◽  
Bülent Solmaz ◽  
Raif Mermutlu ◽  
...  
Keyword(s):  
Activated Sludge ◽  
System Performance ◽  
Membrane Filtration ◽  
Membrane Separation ◽  
Real Data ◽  
Proposed Model ◽  
Gravity Settling ◽  
Major Shortcoming ◽  
Model Components ◽  
Age Range

The structure of existing activated models is inherently deficient in reflecting the major role of the membrane filtration. The study developed a novel model, MASM, for the membrane activated process. The effective filtration size imposed by the membrane module, entrapping larger particles, was adopted as the basis of the proposed model. The model defines a modified form of COD fractionation that accounts for the captured COD fractions as additional model components and utilizes related mass-balance relationships. It was implemented to test the fate of soluble hydrolyzable COD and the system performance of super-fast membrane activated sludge based on real data for the characterization and process kinetics of domestic sewage and denim processing effluents. Model evaluation was carried out for parallel systems with gravity settling and membrane filtration operated at a sludge age range of 0.5–2.0 d. Results reflected significantly better performance by the super-fast membrane activated sludge system for both wastewaters, underlining that it was crucially important to account for the captured COD fractions to provide an accurate evaluation of system behavior and effluent quality. This should also be identified as the major shortcoming of the ASM models for evaluating and predicting the system performance of activated sludge configurations with membrane separation.

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