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Search Results: 1 - 10 of 11321 matches for " George Sithole "
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Lookup Table Hough Transform for Real Time Range Image Segmentation and Featureless Co-Registration  [PDF]
Ben Gorte, George Sithole
Journal of Sensor Technology (JST) , 2012, DOI: 10.4236/jst.2012.23021
Abstract: The paper addresses range image segmentation, particularly of data recorded by range cameras, such as the Microsoft Kinect and the Mesa Swissranger SR4000. These devices record range images at video frame rates and allow for acquisition of 3-dimensional measurement sequences that can be used for 3D reconstruction of indoor environments from moving platforms. The role of segmentation is twofold. First the necessary image co-registration can be based on corresponding segments, instead of corresponding point features (which is common practice currently). Secondly, the segments can be used during subsequent object modelling. By realisising that planar regions in disparity images can be modelled as linear functions of the image coordinates, having integer values for both domain and range, the paper introduces a lookup table based implementation of local Hough transform, allowing to obtain good segmentation results at high speeds.
The African Union Peace and Security mechanism’s crawl from design to reality: Was the Libyan crisis a depiction of severe limitations?
Anyway Sithole
African Journal on Conflict Resolution , 2012,
Abstract: The formation of the Organisation of African Unity (OAU) on the 25th of May 1963 gave hope that African countries would unite in eradicating colonialism as well as facilitating economic and social development. Furthermore, the establishment of the Mechanism for Conflict Prevention, Management and Resolution in 1993 ensured that an institutional structure for the maintenance of peace and security existed on the continent. However, the OAU largely failed to address the challenges that the continent faced and this led to calls for the OAU’s transmutation into the African Union (AU). The establishment of the AU on the 9th of July 2002 was thus greeted with high levels of optimism and euphoria, and the expectation that the continental body would now fully tackle the problems on the continent. An important development was the formation of the Peace and Security Council (PSC) on the 25th of May 2004, as main component of the architecture through which peace and security in Africa were hopefully going to be achieved. This development presented an opportunity for the further institutionalisation of Pan-African ideals, with the hope that Africa would forge even closer unity. However, at present, the AU PSC continues to experience severe challenges, some of them inherent in the organisational structure of the continental body while some are externally induced. Some of these limitations include lack of unity of purpose as well as of political will among member states to deal with the conflicts bedevilling the African continent – as evidenced by developments during the Arab Spring. What transpired in Libya in 2011 was a clear indication of the slow evolution of AU ideals, a situation which was further compounded by the intervention and interference by some members of the North Atlantic Treaty Organisation (NATO), under the aegis of the United Nations (UN) and the pretext of the ‘Responsibility to Protect’. African Journal On Conflict Resolution, 12(2) 2012
Contestations over knowledge production or ideological bullying?: a response to Legassick on the workers' movement
Jabulani Sithole
Kronos (Bellville) , 2009,
Abstract: The key characteristic of the vast amount of literature on the South African workers' movement in the post-1973 period is the denial that the class and national struggles were closely intertwined. This denial is underpinned by a strong 'antinationalist current' which dismisses the national liberation struggle as 'populist and nationalist' and therefore antithetical to socialism. This article cautions against uncritical endorsement of these views. It argues that they are the work of partisan and intolerant commentators who have dominated the South African academy since the 1970s and who have a tendency to suppress all versions of labour history which highlight these linkages in favour of those which portray national liberation and socialism as antinomies. The article also points out that these commentators use history to mobilise support for their rigidly held ideological positions and to wage current political struggles under the pretext of advancing objective academic arguments.
Health standards plummet on occupied farms in Zimbabwe
Sithole Innocent
Bulletin of the World Health Organization , 2003,
The Substance of Identity: Territoriality, Culture, Roots and the Politics of Belonging
V Ojong, M Sithole
African Anthropologist , 2007,
Abstract: Post-apartheid South Africa is at the interface of defining its social fibre, but at the same time, it is faced with the challenge of dealing with historical mishaps such as acute socio-economic inequality, and all forms of social engineering of notions of identity. This has led thinkers and researchers to probe into what it means to be a South African. In a recent book titled ‘Do South Africans Exist”, Chipkin (2007: 178) introduced a discourse, questioning the notion of South “Africaness” based on territory and geography. Other recent writings on race and identity continue to question the wisdom of framing identities in terms of culture and other primordial substances. Such substances have brought about a notion of identity that has led to human catastrophes framed in terms of ethnic identities and racial differences. While this paper capitalizes on such criticism, it interrogates academic discourse for not ‘coming out’ with durable explanations of what identities are about and especially what constitutes them. This paper proposes a conceptual analysis and framing of the substance of identities that balances emic and etic explanations. In this formulation an exploration of a range of elements affecting conceptualization of identities is done, including notions of territoriality culture and roots.
Effectiveness of Teachers at Preparing Grade 7 Candidates for Environmental Science Examinations
Takawira Kazembe,Methias Sithole
Eurasian Journal of Physics and Chemistry Education , 2010,
Abstract: The study was undertaken to investigate the low Grade 7 pass rate at Primary Schools in Zimbabwe which averaged 75% for local languages, 47% for General Paper (GP) and 40% for Maths. The low GP pass rate was thought to be due to teachers’ attitudes towards developing scientific skills necessary to understand Environmental Science (ES). A sample of 77 student teachers, 7 lecturers, 3 headmasters and 12 mentors was used to probe how teachers are trained to teach ES. A questionnaire, observations, documents and informal interviews were used to collect data from student teachers. Interviews were used to collect data from lecturers, mentors and headmasters. About 3.9% of student teachers found science apparatus difficult to use because they were not adequately trained to handle them. At least 50% of them believe that practical activities are necessary for theory comprehension and use practical exercises to motivate pupils so that they achieve their maximum potential. However, most student teachers lament the unavailability of teaching aids although some of them were not keen on their improvisation notwithstanding their necessity for promotion of hands-on minds-on activities. Lecturers attributed students’ problems to students’ insufficient knowledge about ES educational attitudes and blamed this on overloading of students with content at the expense of developing scientific skills. The mentors admitted having insufficient knowledge and skills to adequately supervise student teachers, and that the unavailability of textbooks caused them to engage on drilling methods because headmasters emphasized on high pass rate but were silent on meaningful learning. They believed that ES practical activities was not necessary for Grade 7 examinations.
Analysis of the Process and Outcomes of Eportfolio Development to Recognise Formal Learning in Zimbabwe
Noreen Sarai,Godfrey Sithole
Computer and Information Science , 2012, DOI: 10.5539/cis.v5n3p56
Abstract: The process of developing electronic teaching portfolios can be used to evaluate the teacher’s competency and guide a long-term professional development. This paper addressed the issue of assessment that is linked to the demand for accountability and standards through use of ePortfolio system. The ePortfolio system is then used as an authentication measure for students’ work. The study survey is based on two groups selected from a local university; one group used paper portfolio and the other used electronic portfolio. Data was then analyzed from these two perspectives and digital story telling. EPortfolio development involved defining goals and context of the case, the collection of artifacts, selecting relevant information, showing a reflection and a projection of how the results are produced. Results showed that ePortfolios can be easy to be designed and implemented as a learning tool.
Obstructive sleep apnoea is independently associated with the metabolic syndrome but not insulin resistance state
A Gruber, F Horwood, J Sithole, NJ Ali, I Idris
Cardiovascular Diabetology , 2006, DOI: 10.1186/1475-2840-5-22
Abstract: Obstructive Sleep Apnoea (OSA) has been linked with increased cardiovascular disease (CVD) [1,2]. While obesity per se was previously thought to confer independent vascular risk, more recent studies have provided strong evidence that OSA itself is associated with hypertension [3], dyslipidaemia [4] and impaired glucose tolerance [5], independent of obesity. These proatherogenic factors when clustered together in the same individual are known as the Metabolic Syndrome [6].Insulin resistance has been implicated as central to the pathogenicity of the Metabolic Syndrome [6]. Because central obesity is strongly associated with insulin resistance and generalised endothelial dysfunction [7], waist circumference has been adopted as a surrogate for an individual's insulin resistance status and risk of CVD. Studies on the relationship between insulin resistance and OSA however have yielded conflicting results, with some studies showing significant associations between the two [8,9] while others have not [10,11]. Similarly, studies looking at the effect of treatment of OSA on insulin resistance have also produced contradictory reports, e.g. continuous positive airway pressure (CPAP) treatment improves insulin resistance in one [12] but not in another study [13]. There is also considerable doubt whether subgroup of patients with metabolic syndrome are indeed insulin resistant [14]. In addition, neck circumference rather than waist circumference has been previously reported to be the most important predictor of OSA amongst all anthropometric variables studied [11]. Thus, the associations between the metabolic syndrome, insulin resistance state and central obesity may not necessarily apply among patients with OSA. It also remains unclear if microalbuminuria, a marker of generalised endothelial dysfunction is more prevalent among patients with OSA. Increased understanding on the independent associations between OSA, metabolic syndrome, insulin resistance and microalbuminuria statu
Autism spectrum disorders and fetal hypoxia in a population-based cohort: Accounting for missing exposures via Estimation-Maximization algorithm
Igor Burstyn, Xiaoming Wang, Yutaka Yasui, Fortune Sithole, Lonnie Zwaigenbaum
BMC Medical Research Methodology , 2011, DOI: 10.1186/1471-2288-11-2
Abstract: Provincial delivery records (PDR) identified the cohort of all 218,890 singleton live births in the province of Alberta, Canada, between 01-01-98 and 12-31-04. These were followed-up for ASD via ICD-9 diagnostic codes assigned by physician billing until 03-31-08. Maternal and obstetric risk factors, including FH determined from blood tests of acidity (pH), were extracted from PDR. The binary FH status was missing in approximately half of subjects. Assuming that characteristics of mothers and pregnancies would be correlated with FH, we used an Estimation-Maximization algorithm to estimate HF-ASD association, allowing for both missing-at-random (MAR) and specific not-missing-at-random (NMAR) mechanisms.Data indicated that there was excess risk of ASD among males who were hypoxic at birth, not materially affected by adjustment for potential confounding due to birth year and socio-economic status: OR 1.13, 95%CI: 0.96, 1.33 (MAR assumption). Limiting analysis to full-term males, the adjusted OR under specific NMAR assumptions spanned 95%CI of 1.0 to 1.6.Our results are consistent with a weak effect of fetal hypoxia on risk of ASD among males. E-M algorithm is an efficient and flexible tool for modeling missing data in the studied setting.The autism spectrum disorders (ASD) comprise a group of neurodevelopmental conditions that are associated with impaired verbal and non-verbal communication and social interaction, and restricted and repetitive patterns of behavior, which typically manifest before age of 3 years[1]. Although relatively rare[2-7], ASD can have a devastating effect on the quality of life of entire families and is associated with considerable societal economic burden[8]. There is some evidence that ASD prevalence is on the increase[9], although it remains unclear as to whether this increase can be completely accounted for by changes in case definition and improved ascertainment. While some genetic risk factors for ASD are known[10], the potential contributi
Putting GM technologies to work: public research pipelines in selected African countries
Idah Sithole-Niang, Joel Cohen, Patricia Zambrano
African Journal of Biotechnology , 2004,
Abstract: Can public policies and research institutions in African countries provide safe and useful genetically modified (GM) food crops? This is an urgent question, recognizing that advancing GM food crops can be difficult, affected by global debate, and various regulatory protocols. Reaching farmers has been achieved in several countries only for GM cotton for insect resistant while approvals for food and feed crops lag behind. To address this question, we identified and examined public research pipelines for GM crops in Egypt, Kenya, South Africa and Zimbabwe. Genetic transformation events are reported for 21 crops. Findings are presented for events nearing final stages of development, analysis of the crops, traits and genes involved, and details regarding biosafety. The paper concludes with a summary offering various policies, institutional and regulatory suggestions. Key Words: Africa, biosafety, biotechnology, genetic modification, public research African Journal of Biotechnology Vol.3(11) 2004: 564-571
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