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Research articles (Dept of Computer Science) [7]

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Analyzing the load balance of term-based partitioning

Abusukhon, A.; Talib, M. (The Science and Information Organization Inc., http://ijacsa.thesai.org/, NaN, 2011)

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Abstract:

In parallel (IR) systems, where a large-scale collection is indexed and searched, the query response time is limited by the time of the slowest node in the system. Thus distributing the load equally across the nodes is very important issue. Mainly there are two methods for collection indexing, namely document-based and term-based indexing. In term-based partitioning, the terms of the global index of a large-scale data collection are distributed or partitioned equally among nodes, and then a given query is divided into sub-queries and each sub-query is then directed to the relevant node. This provides high query throughput and concurrency but poor parallelism and load balance. In this paper, we introduce new methods for terms partitioning and then we compare the results from our methods with the results from the previous work with respect to load balance and query response time.

URI:

http://hdl.handle.net/10311/1068

Files in this item: 1

Talib_IJACSA_2011.pdf (325.8Kb)

Using merkle tree to mitigate cooperative black-hole attack in Wireless Mesh Networks

Om, S.; Talib, M. (The Science and Information Organization Inc., www.ijacsa.thesai.org, NaN, 2011)

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Abstract:

Security is always a major concern and a topic of hot discussion to users of Wireless Mesh Networks (WMNs). The open architecture of WMNs makes it very easy for malicious attackers to exploit the loopholes in the routing protocol. Cooperative Black-hole attack is a type of denial-of-service attack that sabotages the routing functions of the network layer in WMNs. In this paper we have focused on improving the security of one of the popular routing protocols among WMNs, Ad-hoc on demand distance vector (AODV) routing protocol and present a probable solution to this attack using Merkle hash tree.

URI:

http://hdl.handle.net/10311/1067

Files in this item: 1

Om_IJACSA_2011.pdf (294.4Kb)

Computing knowledge and skills demand: A content analysis of job adverts in Botswana

Ayalew, Y.; Mbero, Z.A.; Nkgau, T.Z.; Motlogelwa, P.; Masizana-Katongo, A. (The Science and Information Organization, http://thesai.org/Publication/Default.aspx, NaN, 2011)

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Abstract:

This paper presents the results of a content analysis of computing job adverts to assess the types of skills required by employers in Botswana. Through the study of job adverts for computing professionals for one year (i.e., January 2008 to December 2008), we identified the types of skills required by employers for early career positions. The job adverts were collected from 7 major newspapers (published both daily and weekly) that are circulated throughout the country. The findings of the survey have been used for the revision and development of curricula for undergraduate degree programmes at the Department of Computer Science, University of Botswana. The content analysis focused on the identification of the most sought after types of qualifications (i.e., degree types), job titles, skills, and industry certifications. Our analysis reveals that the majority of the adverts did not set a preference to a particular type of computing degree. Furthermore, our findings indicate that those job titles and computing skills which are on high demand are not consistent with previous studies carried out in the developed countries. This requires further investigation to identify reasons for these differences from the perspective of the practices in the IT industry. It also requires further investigation regarding the degree of mismatch between the employers computing skills demands and the knowledge and skills provided by academic programmes in the country.

URI:

http://hdl.handle.net/10311/916

Files in this item: 1

Mbero_IJACSA_2011.pdf (417.6Kb)

Human–computer interface design issues for a multi-cultural and multi-lingual English speaking country — Botswana

Onibere, E.A.; Morgan, S.; Busang, E.M.; Mpoeleng, D. (Elsevier Science Ltd, www.elsevier.com/locate/intcom, NaN, 2001)

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Abstract:

This paper reports on research carried out to determine whether a localised interface is preferred by users in a multi-cultural and multi-lingual country where a non-local language is nationally used,. We attempted to discover whether local symbols are more acceptable to users as icons and also whether the current phrases used in menus and icon descriptions are clearly understood by the various communities. A survey was conducted nation-wide among computer end-users in Botswana. The results indicate an overwhelming desire from users for a localised interface. However, there appears to be little need for localised icons and no agreement as to which language to use for text-based interfaces.

URI:

http://hdl.handle.net/10311/887

Files in this item: 1

Mpoeleng_IC_2001.pdf (1.247Mb)

Building computer graphics education in southern Africa

Asare, S.D.; Mashwama, P.M.; Cunningham, S. (Elsevier Science Ltd, http://www.elsevier.com/locate/cag, NaN, 2003)

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Abstract:	This note discusses issues in building the educational base for computer graphics growth in developing countries, particularly in southern Africa. It is based on a delegation’s visit to southern Africa in the spring of 2001 and on a workshop organised by the authors at the University of Botswana in June 2002.
URI:	http://hdl.handle.net/10311/844

Files in this item: 1

Asare_CG_2003.pdf (448.1Kb)

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