Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 9 of 9
Full-Text Articles in Physical Sciences and Mathematics
On Maximizing Voip Capacity And Energy Conservation In Multi-Rate Wlans, Kwan-Wu Chin
On Maximizing Voip Capacity And Energy Conservation In Multi-Rate Wlans, Kwan-Wu Chin
Faculty of Informatics - Papers (Archive)
This letter highlights a key problem that arises when frame aggregation, a popular method for boosting VoIP capacity, is used in Wireless Local Area Networks (WLANs) that employ asynchronous power save mode (PSM). Specifically, it shows how the PSM proposed by the Wi-Fi Alliance renders frame aggregation ineffective. It then proposes a novel opportunistic scheduler that restores the benefits of frame aggregation whilst ensuring stations have minimal energy expenditure.
Supporting Change Propagation In Uml Models, Hoa Khanh Dam, Michael Winikoff
Supporting Change Propagation In Uml Models, Hoa Khanh Dam, Michael Winikoff
Faculty of Informatics - Papers (Archive)
A critical issue in software maintenance and evolution is change propagation: given a primary change that is made in order to meet a new or changed requirement, what additional, secondary, changes are needed? We have previously developed techniques for effectively supporting change propagation within design models of intelligent agent systems. In this paper, we propose how this approach is applied to support change propagation within UML design models. Our approach offers a number of advantages in terms of saving substantial time writing hard-coded rules, ensuring soundness and completeness, and at the same time capturing the cascading nature of change propagation. …
Supporting Change Propagation In The Maintenance And Evolution Of Service-Oriented Architectures, Hoa Khanh Dam, Aditya K. Ghose
Supporting Change Propagation In The Maintenance And Evolution Of Service-Oriented Architectures, Hoa Khanh Dam, Aditya K. Ghose
Faculty of Informatics - Papers (Archive)
As Service-Oriented Architecture (SOA) continues to be broadly adopted, the maintenance and evolution of service-oriented systems become a growing issue. Maintenance and evolution are inevitable activities since almost all systems tbat are useful and successful stimulate user-generated requests for change and improvement. A critical issue in the evolution of SOA is change propagation: given a set of primary changes that have been made to the SOA model, what additional secondary changes are needed to maintain consistency across mUltiple levels of the SOA models. This paper presents how an existing framework can be applied to effectively support change propagation within a …
Subquadratic Space Complexity Binary Field Multiplier Using Double Polynomial Representation, Jean-Claude Bajard, Christophe Negre, Thomas Plantard
Subquadratic Space Complexity Binary Field Multiplier Using Double Polynomial Representation, Jean-Claude Bajard, Christophe Negre, Thomas Plantard
Faculty of Informatics - Papers (Archive)
This paper deals with binary field multiplication. We use the bivariate representation of binary field called Double Polynomial System (DPS) presented in . This concept generalizes the composite field representation to every finite field. As shown in , the main interest of DPS representation is that it enables to use Lagrange approach for multiplication, and in the best case, Fast Fourier Transform approach, which optimizes Lagrange approach. We use here a different strategy from to perform reduction, and we also propose in this paper, some new approaches for constructing DPS. We focus on DPS, which provides a simpler and more …
A Network-Aware Virtual Machine Placement And Migration Approach In Cloud Computing, Jingtai Piao, Jun Yan
A Network-Aware Virtual Machine Placement And Migration Approach In Cloud Computing, Jingtai Piao, Jun Yan
Faculty of Informatics - Papers (Archive)
Cloud computing represents a major step up in computing whereby shared computation resources are provided on demand. In such a scenario, applications and data thereof can be hosted by various networked virtual machines (VMs). As applications, especially data-intensive applications, often need to communicate with data frequently, the network I/O performance would affect the overall application performance significantly. Therefore, placement of virtual machines which host an application and migration of these virtual machines while the unexpected network latency or congestion occurs is critical to achieve and maintain the application performance. To address these issues, this paper proposes a virtual machine placement …
Planetary-Scale Rfid Services In An Age Of Uberveillance, Katina Michael, George Roussos, George Q. Huang, Arunabh Chattopadhyay, Rajit Gadh, B S. Prabhu, Peter Chu
Planetary-Scale Rfid Services In An Age Of Uberveillance, Katina Michael, George Roussos, George Q. Huang, Arunabh Chattopadhyay, Rajit Gadh, B S. Prabhu, Peter Chu
Faculty of Informatics - Papers (Archive)
Radio-frequency identification has a great number of unfulfilled prospects. Part of the problem until now has been the value proposition behind the technology- it has been marketed as a replacement technique for the barcode when the reality is that it has far greater capability than simply non-line-of-sight identification, towards decision-making in strategic management and reengineered business processes. The vision of the Internet of Things has not eventuated but a world in which every object you can see around you carries the possibility of being connected to the internet is still within the realm of possibility. However incremental innovations may see …
Using Coverage Information To Guide Test Case Selection In Adaptive Random Testing, Zhiquan Zhou
Using Coverage Information To Guide Test Case Selection In Adaptive Random Testing, Zhiquan Zhou
Faculty of Informatics - Papers (Archive)
Random Testing (RT) is a fundamental software testing technique. Adaptive Random Testing (ART) improves the fault-detection capability of RT by employing the location information of previously executed test cases. Compared with RT, test cases generated in ART are more evenly spread across the input domain. ART has conventionally been applied to programs that have only numerical input types, because the distance between numerical inputs is readily measurable. The vast majority of computer programs, however, involve non-numerical inputs. To apply ART to these programs requires the development of effective new distance measures. Different from those measures that focus on the concrete …
Unpacking The Rfid Investment Decision, Byron W. Keating, Tim R. Coltman, Samuel Fosso Wamba, Valerie Baker
Unpacking The Rfid Investment Decision, Byron W. Keating, Tim R. Coltman, Samuel Fosso Wamba, Valerie Baker
Faculty of Informatics - Papers (Archive)
Mandates aside, there are many reasons why firms decide to move forward with or delay investment in RFID technology. In this paper we use a theoretically based, easy to implement methodology to empirically derive a relative importance scale of those factors that influence the decision to invest in RFID technology. More specifically, we compare the factors that matter most and least to a sample of firms that have adopted RFID technology with a sample of firms that have yet to embrace RFID technology. The theoretical and practical implications are that both RFID adopters and non adopters are driven by the …
Social-Technical Issues Facing The Humancentric Rfid Implantee Sub-Culture Through The Eyes Of Amal Graafstra, Amal Graafstra, Katina Michael, M G. Michael
Social-Technical Issues Facing The Humancentric Rfid Implantee Sub-Culture Through The Eyes Of Amal Graafstra, Amal Graafstra, Katina Michael, M G. Michael
Faculty of Informatics - Papers (Archive)
Radio-frequency identification (RFID) tags and transponders have traditionally been used to identify domesticated animals so that they can be reunited with their owners in the event that they stray. In the late 1990s, industry started to investigate the benefits of using RFID to identifying non-living things throughout the supply chain toward new efficiencies in business operations. Not long after, people began to consider the possibilities of getting RFID tag or transponder implants for themselves. Mr Amal Graafstra of the United States is one of the first, and probably most well-known ‘do it yourselfer’ (DIY) implantees, who enjoys building customized projects …