Search results

21 – 30 of over 21000
Article
Publication date: 29 April 2014

Yifei Tong, Zhaohui Tang, Kaijun Zhou and Ying dong

The increase in demand variability created by manufacturing enterprises presents new challenges for increasing resource usage and sharing flexibility. For this reason, it is of…

Abstract

Purpose

The increase in demand variability created by manufacturing enterprises presents new challenges for increasing resource usage and sharing flexibility. For this reason, it is of great importance to research manufacturing grids and their service modes. The purpose of this paper is to establish a systematic strategy and a system tool for manufacturing grid systems.

Design/methodology/approach

A manufacturing service oriented manufacturing grid (MSoMG) system is presented with open grid service architecture as the system architecture and GT3.9 as a development tool. A framework is proposed to support MSoMG by providing advisory tools and methods for uncertain information analysis and processing, multi-objective decision making of manufacturing grid service execution, manufacturing grid service performance prediction based on knowledge template, and flexible manufacturing grid service scheduling and solution. The methodology of the adopted rough set is discussed in detail. Finally, the design support strategies for MSoMG are investigated to guide the coordination of manufacturing activities.

Findings

Many conventional methods and models become very limited for manufacturing grid service with uncertain information. The processing of uncertain information and reasonable application flow can help to improve the completion rate and reliability of manufacturing grid services.

Practical implications

This research provides a solid foundation for manufacturing gird operations and can promote the use of a manufacturing grid mode.

Originality/value

A MSoMG system is presented. The manufacturing grid service with uncertain information is considered as well as design support strategies.

Article
Publication date: 4 September 2007

Klaus Möller

Grid computing has often been heralded as the next logical step after the worldwide web. Users of grids can access dynamic resources such as computer storage and use the computing…

Abstract

Purpose

Grid computing has often been heralded as the next logical step after the worldwide web. Users of grids can access dynamic resources such as computer storage and use the computing resources of computers under the umbrella of a virtual organisation. Although grid computing is often compared to the worldwide web, it is vastly more complex both in organisational and technical areas. This also extends into the area of security and incident response, where established academic computer security incident response teams (CSIRTs) face new challenges arising from the use of grids. This paper aims to outline some of the organisational and technical challenges encountered by the German academic CSIRT, DFN‐CERT while extending and adapting their services to grid environments during the D‐Grid project.

Design/methodology/approach

Most national research and education networks (NRENs) already have computer security incident response teams to respond to security incidents involving computers connected to the networks. This paper considers how one established NREN CSIRT is dealing with the new challenges arising from grid computing.

Findings

The paper finds that D‐Grid Initiative is an ongoing project and the establishment of CSIRT services for grids is still at an early stage. The establishment of communication channels to the various grid communities as well as gaining of knowledge about grid software has required DFN‐CERT to make changes even though the basic principles of CSIRT operation remain the same.

Originality/value

The D‐Grid project aims to establish a common grid infrastructure that can be used by other scientific domains. The project consists of six community projects and one integration project (DGI – D‐Grid Integration). The DGI project will develop the basic infrastructure, while the community projects will build on this infrastructure and enhance it for the specific needs of their research areas. At the initial stage of the DGI project, the idea of a central CSIRT for all grids in Germany was seen as an advantage over having a CSIRT for each grid project, which would have replicated efforts and thus wasted resources. This paper gives an overview about the organisational and technical challenges and experiences DFN‐CERT has encountered while setting up a CSIRT for the D‐Grid communities.

Details

Campus-Wide Information Systems, vol. 24 no. 4
Type: Research Article
ISSN: 1065-0741

Keywords

Article
Publication date: 7 January 2019

Ravinder Singh and Kuldeep Singh Nagla

An efficient perception of the complex environment is the foremost requirement in mobile robotics. At present, the utilization of glass as a glass wall and automated transparent…

Abstract

Purpose

An efficient perception of the complex environment is the foremost requirement in mobile robotics. At present, the utilization of glass as a glass wall and automated transparent door in the modern building has become a highlight feature for interior decoration, which has resulted in the wrong perception of the environment by various range sensors. The perception generated by multi-data sensor fusion (MDSF) of sonar and laser is fairly consistent to detect glass but is still affected by the issues such as sensor inaccuracies, sensor reliability, scan mismatching due to glass, sensor model, probabilistic approaches for sensor fusion, sensor registration, etc. The paper aims to discuss these issues.

Design/methodology/approach

This paper presents a modified framework – Advanced Laser and Sonar Framework (ALSF) – to fuse the sensory information of a laser scanner and sonar to reduce the uncertainty caused by glass in an environment by selecting the optimal range information corresponding to a selected threshold value. In the proposed approach, the conventional sonar sensor model is also modified to reduce the wrong perception in sonar as an outcome of the diverse range measurement. The laser scan matching algorithm is also modified by taking out the small cluster of laser point (w.r.t. range information) to get efficient perception.

Findings

The probability of the occupied cells w.r.t. the modified sonar sensor model becomes consistent corresponding to diverse sonar range measurement. The scan matching technique is also modified to reduce the uncertainty caused by glass and high computational load for the efficient and fast pose estimation of the laser sensor/mobile robot to generate robust mapping. These stated modifications are linked with the proposed ALSF technique to reduce the uncertainty caused by glass, inconsistent probabilities and high load computation during the generation of occupancy grid mapping with MDSF. Various real-world experiments are performed with the implementation of the proposed approach on a mobile robot fitted with laser and sonar, and the obtained results are qualitatively and quantitatively compared with conventional approaches.

Originality/value

The proposed ASIF approach generates efficient perception of the complex environment contains glass and can be implemented for various robotics applications.

Details

International Journal of Intelligent Unmanned Systems, vol. 7 no. 1
Type: Research Article
ISSN: 2049-6427

Keywords

Article
Publication date: 4 September 2009

Brian Hancock

The purpose of this paper is to demonstrate the efficacy of using the Inferno operating system to set up a simple data grid.

Abstract

Purpose

The purpose of this paper is to demonstrate the efficacy of using the Inferno operating system to set up a simple data grid.

Design/methodology/approach

The paper demonstrates the set up and concepts of a simple data grid using the Inferno operating system.

Findings

The research finds that a secure but simple data grid can be set up to access documents wherever they may be.

Practical implications

The data grid makes it very simple to move files from machines as if the user was using one virtual machine.

Originality/value

There is no need to use complex systems to set up a data grid, it can be done easily without much overhead.

Details

Library Hi Tech, vol. 27 no. 3
Type: Research Article
ISSN: 0737-8831

Keywords

Article
Publication date: 1 May 2005

Wei Xing, Marios D. Dikaiakos, Hua Yang, Angelos Sphyris and George Eftichidis

This paper aims to describe the main challenges of identifying and accessing useful information and knowledge about natural hazards and disasters results. The paper presents a grid

1209

Abstract

Purpose

This paper aims to describe the main challenges of identifying and accessing useful information and knowledge about natural hazards and disasters results. The paper presents a grid‐based digital library system designed to address the challenges.

Design/methodology/approach

The need to organize and publish metadata about European research results in the field of natural disasters has been met with the help of two innovative technologies: the Open Grid Service Architecture (OGSA) and the Resource Description Framework (RDF). OGSA provides a common platform for sharing distributed metadata securely. RDF facilitates the creation and exchange of metadata.

Findings

Using grid technology allows the RDF metadata of European research results in the field of natural disasters to be shared securely and effectively in a heterogeneous network environment.

Originality/value

A metadata approach is proposed for the extraction of the metadata, and their distribution to third parties in batch, and their sharing with other applications can be a quickly process. Furthermore, a method is set out to describe metadata in a common and open format, which can become a widely accepted standard; the existence of a common standard enables the metadata storage in different platforms while supporting the capability of distributed queries across different metadata databases, the integration of metadata extracted from different sources, etc. It can be used for the general‐purpose search engines.

Details

Library Management, vol. 26 no. 4/5
Type: Research Article
ISSN: 0143-5124

Keywords

Article
Publication date: 21 November 2008

Antônio Tadeu A. Gomes, Artur Ziviani, Bruno F. Bastos and Luciana S. Lima

Although wireless grids have been originally thought of as isolated processing clusters, the possibility of their approaching – and connecting to – a fixed network allows for a…

Abstract

Purpose

Although wireless grids have been originally thought of as isolated processing clusters, the possibility of their approaching – and connecting to – a fixed network allows for a huge expansion of their processing power, due to the resources available in wired grids potentially accessible through such a network. The interoperation of mobile ad hoc grids and resources available in wired grids is, however, a problem still to be tackled in the literature. The purpose of this paper is to tackle this problem.

Design/methodology/approach

A prototype is developed to demonstrate the feasibility of the interoperation between wireless and wired grids, thus providing a basis for the development of novel applications that can build on this interoperation.

Findings

The outcome of the paper comprises the analysis of the necessary requirements for the interoperation between wireless and wired grids, the proposal of two different interoperation approaches, and the provision of a qualitative assessment of the implications of these approaches.

Research limitations/implications

There are many points that the authors intend to address as future work. First, they are aware of the need for performing some quantitative analyses of their proxy implementations. Second, they intend to investigate the possibility of mobile ad hoc grids to process tasks coming from wired grids. Third, they are interested in allowing the submission of tasks that present interdependencies (workflows) from mobile devices in the mobile ad hoc grid.

Practical implications

The paper investigates the interoperation of wireless and wired grids. Such an interoperation may open new perspectives of practical use of wireless devices in scenarios such as emergency response networks and field research systems, to name a few.

Originality/value

The paper provides a first step into the interoperation of wireless and wired grids, thus yielding a basis for the development of novel applications that can build upon this interoperation. This is believed to be of interest to both the grid and mobile computing communities.

Details

International Journal of Pervasive Computing and Communications, vol. 4 no. 4
Type: Research Article
ISSN: 1742-7371

Keywords

Article
Publication date: 17 February 2021

Amir Tjolleng, Kihyo Jung, Hyunsook Han, Hyunjung Han and Jayoung Cho

Size fit and economic efficiency are two crucial aspects that need to be considered in designing a sizing system. However, there could exist a trade-off between those aspects in…

Abstract

Purpose

Size fit and economic efficiency are two crucial aspects that need to be considered in designing a sizing system. However, there could exist a trade-off between those aspects in order to establish a practical sizing system. The purpose of this paper is to develop a sequential hybrid method of grid and optimization to generate a practical sizing system using anthropometric data.

Design/methodology/approach

The proposed sequential hybrid method consisted of two sequential steps, which employs grid method and optimization method. In the initial step, the grid method creates primary grids that accommodate a designated percentage (e.g. 90%) of users with best size fit. In the subsequent step, the optimization method generated additional grids to provide acceptable fit, with minimum fit penalty scores for users unaccommodated by the primary grids. Our method was applied to the development of a sizing system for men's military jackets. The proposed method performances were evaluated in terms of accommodation percentage, size fit and number of sizing categories.

Findings

Our proposed method resulted in 26 primary grids during the initial step, which cover 90% of users. Next, we generated six additional grids during the subsequent step that provide minimum fit penalty scores for the rest (10%) users.

Originality/value

The main contributions of this paper are as follows: consider accommodation percentage, size fit and number of sizing categories in the design of sizing system; combine the grid and optimization methods and evaluate a sizing system for men's military jackets. The proposed method is applicable to develop optimal sizing systems for multiple-size products.

Details

International Journal of Clothing Science and Technology, vol. 34 no. 1
Type: Research Article
ISSN: 0955-6222

Keywords

Article
Publication date: 1 December 2005

Lazaros Gymnopoulos, Vassilios Tsoumas, Ioannis Soupionis and Stefanos Gritzalis

The purpose of this paper is to provide a framework for enhancing security policy management in the Grid.

1210

Abstract

Purpose

The purpose of this paper is to provide a framework for enhancing security policy management in the Grid.

Design/methodology/approach

The Grid security policy reconciliation problem is presented. A generic view on the security policy notion is adopted and the security policy ontology notion is introduced and used.

Findings

In the course of this work it was found that, in order to enhance security policy management in the Grid, Grid entities should have the ability to negotiate their security policies. It was also found that, in order to achieve security policy negotiation, effective security policy semantics manipulation towards security policy reconciliation is needed. Finally, it was established, through the use of an example, that if appropriate means are used for security policy reconciliation then incompatible security policy representations can be transformed into compatible ones.

Research limitations/implications

Research limitations stem from the adoption of a generic view on the security policy notion and the selection of identification and authentication security policies as the focal point of the proposed framework. Research implications include the possibility of examining how existing security policy reconciliation models can be incorporated in this generic framework. The possibility of investigating how such a framework can lead to a security policy knowledge management tool for Grid administrators is also demonstrated.

Practical implications

Practical implications of this work include the establishment of a common framework for security information exchange between Grid entities.

Originality/value

This paper proposes a framework for enhancing security policy management in the Grid. The proposed framework can be used by researchers as a reference and by security experts in order to reduce ambiguity concerning the interpretation of security policies expressed in different forms, by negotiating Grid entities.

Details

Internet Research, vol. 15 no. 5
Type: Research Article
ISSN: 1066-2243

Keywords

Article
Publication date: 7 June 2011

Tarek Helmy and Zeehasham Rasheed

Grid computing is gaining more significance in the high‐performance computing world. This concept leads to the discovery of solutions for complicated problems regarding the…

Abstract

Purpose

Grid computing is gaining more significance in the high‐performance computing world. This concept leads to the discovery of solutions for complicated problems regarding the diversity of available resources among different jobs in the grid. However, the major problem is the optimal job scheduling for heterogeneous resources, in which each job needs to be allocated to a proper grid's node with the appropriate resources. An important challenge is to solve optimally the scheduling problem, because the capability and availability of resources vary dynamically and the complexity of scheduling increases with the size of the grid. The purpose of this paper is to present a framework which combines the fuzzy C‐mean (FCM) clustering with an ant colony optimization (ACO) algorithm to improve the scheduling decision when the grid is heterogeneous.

Design/methodology/approach

In the proposed model, the FCM algorithm classifies the jobs into appropriate classes, and the ACO algorithm maps the jobs to the appropriate resources. The ACO is characterized by ant‐like mobile agents that cooperate and stochastically explore a network, iteratively building solutions based on their own memory and on the traces (pheromone levels) left by other agents.

Findings

The simulation is done by using historical information on jobs in a grid. The experimental results show that the proposed algorithm can allocate jobs more efficiently and more effectively than the traditional algorithms for scheduling policies.

Originality/value

The paper provides a scheduling model based on FCM clustering and ACO algorithm for grid scheduling. The authors compared the performance of the proposed algorithm with the performance of various job‐scheduling algorithms in the grid computing environment. The comparison results show that the proposed algorithm outperforms other algorithms and gives optimal results.

Details

International Journal of Intelligent Computing and Cybernetics, vol. 4 no. 2
Type: Research Article
ISSN: 1756-378X

Keywords

Article
Publication date: 10 October 2018

Jiaping Xie, Weisi Zhang, Lihong Wei, Yu Xia and Shengyi Zhang

The purpose of this paper is to examine the impact of renewable energy on the power supply chain and to study whether the renewable generator or the power grid that purchases…

Abstract

Purpose

The purpose of this paper is to examine the impact of renewable energy on the power supply chain and to study whether the renewable generator or the power grid that purchases power from the power spot market is better when the actual generation of renewable energy is insufficient. The authors want to compare and analyze the different power supply chain operation modes and discuss the optimal mode selection for renewable energy generator and power grid in different situations.

Design/methodology/approach

This paper studies the grid-led price competition game in the power supply chain, in which the power grid as a leader decides the price of transmission and distribution, and generators determine the power grid price. The renewable energy power generator and the traditional energy power generator conduct a price competition game; on the other hand, the power grid and power generators conduct Stackelberg games. The authors analyze the power supply of single power generator and two power generators, respectively, and research on the situation that the renewable energy cannot be fully recharged when the actual power generation is insufficient.

Findings

The study finds that both renewable and traditional power grid prices decline as price sensitivity coefficient of demand and installed capacity of renewable energy generators increase. Power grid premium decreases as the price sensitivity coefficient of demand increases, but rises as the installed capacity of renewable energy generator increases. When there is a shortage of power, if the installed capacity of renewable energy is relatively small and price sensitivity coefficient of demand is relatively large, the grid purchases the power from power spot market and shares cost with renewable energy generators, leading to higher expected profits of the renewable energy generators. On the contrary, the renewable energy generators prefer to make up power shortage themselves. For the power grid, purchasing the power by the renewable energy generators when there is a power shortage can bring more utility to the power grid when the installed capacity of renewable energy is lower and the demand price sensitivity coefficient is higher. When the installed capacity of renewable energy is high and the price sensitivity coefficient of demand is moderate, or the installed capacity of renewable energy is moderate and the demand price sensitivity coefficient is high, a generator that simultaneously possesses two kinds of energy source will bring more utility to the power grid. If the installed capacity of renewable energy and the demand price sensitivity coefficient both are small or the installed capacity of renewable energy and the price sensitivity coefficient of demand both are large, the power grid prefers to purchase the power by itself when there is a power shortage.

Practical implications

The goal of our paper analysis is to explore the implications of the theoretical model and address the series of research questions regarding the impact of the renewable energy on the power supply chain. The results of this study have key implications for reality. This paper sheds light on the power supply chain operation mode selection, which can potentially be used for the renewable energy generators to choose their operating mode and can also help traditional energy generators and power grid enterprises maximize their utility. This paper also has some references for the government to formulate the corresponding renewable energy development policy.

Originality/value

This paper studies the power operation mode under the uncertainty of supply and demand, and compares the advantages and disadvantages of renewable energy generator that makes up the shortage or the power grid purchases the power from power spot market then shares cost with the renewable energy generator. This paper analyzes the power grid-led coordination problem in a power supply chain, compares and analyzes the price competition game model of single power generator and dual power generators, and compares the different risk preferences of power grid.

Details

Industrial Management & Data Systems, vol. 119 no. 2
Type: Research Article
ISSN: 0263-5577

Keywords

21 – 30 of over 21000