DSpace community: 資訊工程學系

Wireless broadcasting with optimized transmission efficiency

title: Wireless broadcasting with optimized transmission efficiency abstract: 摘要： Broadcasting is one of the fundamental operations to disseminate information throughout a wireless network. Flooding is a simple method to realize broadcasting. However, flooding will incur a large number of redundant retransmissions, leading to low transmission efficiency, which is the ratio of the effective transmission area to the total transmission area. In this paper, we propose a geometry-based wireless broadcast protocol, called Optimized Broadcast Protocol (OBP), to improve the transmission efficiency. In OBP, each node calculates the retransmission locations based on a hexagon ring pattern in order to minimize the number of retransmissions, and only the nodes nearest to the calculated locations need to retransmit the broadcast packet. As shown by analysis, the transmission efficiency bound of OBP is 0.55, which is about 90% of the theoretical optimal bound 0.61 and is better than that of BPS, the geometry-based broadcast protocol with the highest transmission efficiency 0.41 known so far. Since the transmission efficiency is inversely proportional to the number of required nodes to cover a network area, in a static deployed network, the number of deployed nodes is minimized by OBP. However, in a randomly deployed network or a mobile network, when the node density is not high, the network area of interest may not be fully covered and OBP has worse reachability than BPS for some cases. We thus propose an extension of OBP, called OBPE, to improve the reachability when the node density is not high. We make comparisons for OBP, OBPE and BPS in terms of transmission efficiency, reachability, transmission redundancy, and the number of transmissions, energy consumption to show the advantages of OBP and OBPE. 出版者： Taipei: 社團法人中華民國計算語言學學會出版日期： 2012-05-01 出處： Journal of Information Science and Engineering, 2012-05, Vol.28 (3), p.479-502 資源來源：華藝線上圖書館版權： 2015 INIST-CNRS 識別號： ISSN: 1016-2364 識別號： DOI: 10.6688/JISE.2012.28.3.4

When a classroom is not just a classroom: Building digital playgrounds in the classroom

title: When a classroom is not just a classroom: Building digital playgrounds in the classroom abstract: 摘要： In the context of classroom, it is possible to create a playground with digital technology beneficial for learning in spite of rising enthusiasm in incorporating educational games in classroom. This paper is an essay to describe a learning playground called Digital Learning Playground (DLP). It is essentially an application of digital technology to build a Mixed Reality environment with game-based-learning-like ingredient for classroom context. A learning theory that could be used to describe the learning process is that of experiential learning by Kolb. Meanwhile, Total Scenario Response (TSR) can be used for its learning design. Although the experiment was applied in the context of learning English, it may open a possibility to extend for the purpose of learning other subjects, such as Math. 出版者： Adapazari: Sakarya University 出版日期： 2012-01-01 出處： TOJET : the Turkish online journal of educational technology, 2012-01, Vol.11 (1), p.202 資源來源： ERIC - Full Text Only (Discovery) 版權： Copyright Sakarya University 2012 識別號： ISSN: 1303-6521 識別號： EISSN: 1303-6521

Welcome message from the SKDM 2012 chairs

title: Welcome message from the SKDM 2012 chairs abstract: 出版者： The Netherlands: Springer Netherlands 出版日期： 2012 出處： Human Centric Technology and Service in Smart Space, 2012, Vol.182 資源來源： Springer Books 識別號： ISBN: 9400795599 識別號： ISBN: 9789400795594 識別號： EISBN: 9789400750869 識別號： EISBN: 9400750862 識別號： OCLC: 804849422 識別號： LCCallNum: TK5101-5105.9

Web security in a windows system as PrivacyDefender in private browsing mode

title: Web security in a windows system as PrivacyDefender in private browsing mode abstract: 摘要： Recently, due to the advance and development of Internet technology and its development, web browsers have become essential applications. A web browser is not only used to surf the Internet, but also plays an important role as a portable operating system. For example, many users edit documents via an online editor and store the documents in an online storage repository. All those tasks are done with the help of a web browser. This results in a large number of attacks on web browsers. Therefore, the security of web browsers has become an increasingly important issue in recent years. Traditionally, when a user surfs on the Internet, his interaction with the browser is recorded. This scenario is called public browsing mode. Through attacking web browsers, attackers can obtain access to surfers’ private information, including surfing habits and passwords. The attackers are able to do this as web browsers always leave cookies, browsing histories and caches on the users’ computers. To avoid malicious attacks, many web browsers have developed private browsing mode mechanisms. In private browsing mode, a user’s behavior is not traced and his private information is retained as well. However, these mechanisms still create files such as bookmarks. Most importantly, the files downloaded through a web browser will be saved to disk unless the user deletes them himself. This is an extremely serious threat to the private security of web users. We designed a mechanism in Windows XP that observes the behaviors and patterns related to the creation and deletion of files in Firefox while in private browsing mode. We then focused on the files which were not deleted, and cleared them by means of anti-forensics manners. In other words, the web browsers can be made comprehensively secure with our mechanism. 其他題名： Multimed Tools Appl 出版者： Boston: Springer US 出版日期： 2015-03-01 出處： Multimedia tools and applications, 2015-03, Vol.74 (5), p.1667-1688 資源來源： ABI/INFORM Collection 版權： Springer Science+Business Media New York 2014 版權： Springer Science+Business Media New York 2015 識別號： ISSN: 1380-7501 識別號： EISSN: 1573-7721 識別號： DOI: 10.1007/s11042-014-2003-5