We review the relationship between abstract machines for (call-byname or call-by-value) λ-calculi (extended with Felleisen's C) and sequent calculus, reintroducing on the way Curien-Herbelin's syntactic kit o...
详细信息
We present a game-theoretic framework for modeling and solving routing problems in dynamically changing networks. the model covers the aspects of reactivity and non-termination, and it is motivated by quality-of-servi...
详细信息
Maintaining cache consistency in mobile computing is challenging due to the limitations in the mobile environment such as narrow bandwidth, limited capabilities of mobile devices, disconnectivity, and user mobility. I...
详细信息
ISBN:
(纸本)9781605586595
Maintaining cache consistency in mobile computing is challenging due to the limitations in the mobile environment such as narrow bandwidth, limited capabilities of mobile devices, disconnectivity, and user mobility. In this paper we survey the different methods used for maintaining mobile cache consistency in client-server architecture. Moreover, we categorize these methods based on the inheritance problems of mobile environment that they are dealing with, and present the strengths and the weaknesses of these methods. We conclude from this survey that, till now there is no optimum scheme that maintains the consistency of the mobile cache without degrading in caching system functionality. Copyright 2009 ACM.
Implementing wireless sensor networks present new challenges compared withtheoretical networks. In addition, results derived from the implementation might differ from theoretical results. Moreover, some routing proto...
详细信息
ISBN:
(纸本)9781605586595
Implementing wireless sensor networks present new challenges compared withtheoretical networks. In addition, results derived from the implementation might differ from theoretical results. Moreover, some routing protocols when implemented might fail to perform. In this paper, we implement three routing protocols namely: Dynamic MANET On-demand, Collection Tree and Dissemination Protocols using a TELOSB sensor network. Our aim is to compare their performances. To demonstrate the pros and cons of these protocols, several performance metrics are carried out. True sensors' readings are measured for future use in our simulation experiments. Copyright 2009 ACM.
Personal learning environments (PLEs) require new ways to motivate and scaffold learners. In particular, practice sharing is of importance for learner-centric approaches in the scope of (technology-enhanced) lifelong ...
详细信息
ISBN:
(纸本)9783642034251
Personal learning environments (PLEs) require new ways to motivate and scaffold learners. In particular, practice sharing is of importance for learner-centric approaches in the scope of (technology-enhanced) lifelong learning, as it is an enabler for community building and sustaining. In this paper we elaborate prerequisites for 'good practice sharing' and explain how we realized these aspects in our PLE solution named Mash-Up Personal Learning Environments (***). Finally, we argue for the utility of our MUPPLE approach by highlighting two different strategies of good practice sharing and their benefits for learning and community building.
this paper presents a work in progress of a system to navigate user location using Global Positioning System (GPS) in campus environment that utilizes user's Personal Digital Assistant (PDA) with built-in GPS rece...
详细信息
ISBN:
(纸本)9781605586595
this paper presents a work in progress of a system to navigate user location using Global Positioning System (GPS) in campus environment that utilizes user's Personal Digital Assistant (PDA) with built-in GPS receiver. this application provides 3D atmosphere so it will be easier for the user to recognize a most likely place to the real-world environment. the user could navigate using 3D model and at the same time can switch to the 2D maps environment. the 2D map environments assist the user to look the overall of the location on campus area. the combination of 2D map and 3D view in the system can help the user to switch between them effortlessly. this user navigation application could apply the carry on movement of the user on the map. Copyright 2009 ACM.
Positioning technology for realization of Location Based Service (LBS) is being emphasized. For the goal of LBS, 'Seamless LBS', precise positioning results and more appropriate techniques are needed. In this ...
详细信息
ISBN:
(纸本)9781605586595
Positioning technology for realization of Location Based Service (LBS) is being emphasized. For the goal of LBS, 'Seamless LBS', precise positioning results and more appropriate techniques are needed. In this paper, IEEE802.11 WLAN which is being extended due to its mobility, portability, and simplicity is considered for positioning. Recently, IEEE802.11 WLAN is getting more popular as the increase of its use at the university, airport, hospital, and public buildings and so on. By using this WLAN, we have studied indoor positioning technique to get reasonable positioning results at the indoor environments. First, we analyzed the signal characteristics of WLAN. After that, the each result applied various positioning algorithms are compared. Lastly, we propose the fusion algorithm to get the enhanced positioning results. Copyright 2009 ACM.
Problem-based Learning (PBL) has been widely used in various professional educations. But, why the movement of PBL advances to IT education still far behinds? the reason is very simple - firstly, educators under PBL p...
详细信息
ISBN:
(纸本)9780889867895
Problem-based Learning (PBL) has been widely used in various professional educations. But, why the movement of PBL advances to IT education still far behinds? the reason is very simple - firstly, educators under PBL pedagogy have much more workload and duties than under the traditional IT teaching methods, such as, PBL activities design, students discussion guidance, formative assessments and etc. Secondly, the large student numbers and limited staff in most of the IT undergraduate classrooms hinder interested IT educators to accept PBL. Contrary, to face the new challenges of the e-Learning generation, IT education ought to combine their original teaching method with PBL pedagogy as a result to form an improved bi-directional pedagogy - when technologies are ready to support more problem/solution discussions online. this paper promotes PBL for IT education. the study positions educators at the center role to inspect PBL discipline from four perspectives: (1) problems (2) students (3) tutors and (4) assessments;consequently, suggesting the bottleneck of PBL workload for the interested IT educators. In this paper, to release the IT staff shortage for implementing PBL pedagogy, the conclusion has advised IT developing "computer tutors" from four perspectives, as the paper suggested, to save the workload for educators.
Blog service has become popular in recently years. Web users can post their articles on their blog sites. However, users do not have full control of their articles after these articles have been posted while blog serv...
详细信息
ISBN:
(纸本)9781605586595
Blog service has become popular in recently years. Web users can post their articles on their blog sites. However, users do not have full control of their articles after these articles have been posted while blog service is built with client/server model. therefore, peer-to-peer (P2P) technology has been proposed to establish blog services. However, compare those P2P systems with traditional blog systems, the user experiences of using blog systems in those P2P systems are still far from the ones in traditional systems. For example, only a part of multimedia content types are supported. this paper proposes a new platform, named Pebble2P, which combines traditional blog system and P2P blog system. thus, users can have user experience similar to the one in traditional blog while the benefits of P2P blog system remain preserved. Copyright 2009 ACM.
RSS (Really Simple Syndication), an XML-based format for sharing and distributing web content to the RSS reader has actively been used for retrieving the latest update's weblogs information among the bloggers in b...
详细信息
ISBN:
(纸本)9781605586595
RSS (Really Simple Syndication), an XML-based format for sharing and distributing web content to the RSS reader has actively been used for retrieving the latest update's weblogs information among the bloggers in blogosphere environment. However, RSS aggregators that are used to feed the RSS web-contained from the different formats have lead to the issues of RSS syndication confusion. Although their ability to aggregate the latest updated weblogs in timely manner, weblogs that are published in chronological order from multiple sites with different RSS syndication format have lead to ambiguity problem, resulting an uncategorized and irrelevancy of aggregated result. In this paper, a synthetic analyzer named PheRSS is presented. PheRSS is able to collect the different syndication format to achieve a broader set of metadata. Withthe rules and constraints applied, a more relevant set of data based on user interest can be obtained. the experiment is done to evaluate the accuracy of the result. It is founded that the result achieved better accuracy comparing to Feed Demon. Copyright 2009 ACM.
暂无评论