Visualization of a data leak : how can visualization assist to determine the scope of an attack?

The potential impact that data leakage can have on a country, both on a national level as well as on an individual level, can be wide reaching and potentially catastrophic. In January 2013, several South African companies became the target of a hack attack, resulting in the breach of security measures and the leaking of a claimed 700000 records. The affected companies are spread across a number of domains, thus making the leak a very wide impact area. The aim of this paper is to analyze the data released from the South African breach and to visualize the extent of the loss by the companies affected. The value of this work lies in its connection to and interpretation of related South African legislation. The data extracted during the analysis is primarily personally identifiable information, such as defined by the Electronic Communications and Transactions Act of 2002 and the Protection of Personal Information Bill of 2009

Comparative growth and static allometry in the genus Chlorocebus

Characterizing variation in growth across populations is critical to understanding multiple aspects of development in primates, including within-taxon developmental plasticity and the evolution of life history patterns. Growth in wild primates has often been reported and directly compared across larger taxonomic groups and within social groups, but comparisons are rarely investigated across widely dispersed populations of a single taxon. With the Vervet Phenome-Genome Project and the International Vervet Research Consortium, we trapped 936 vervet monkeys of all ages representing three populations (Kenyan pygerythrus, South African pygerythrus, and sabaeus from St. Kitts & Nevis). We gathered 10 different body measurements from each including mass, body breadth and length, segmental limb lengths, and chest circumference. To gain a better understanding of how ontogenetic patterns vary in these populations, we calculated bivariate allometry coefficients, derived using PCA on log-transformed and z-standardized trait values, and compared them to isometric vector coefficients. Within all population samples, around weaning age most traits showed a negative allometric relationship to body length. As each population ages, however, distinct patterns emerge, showing population differences in onset and intensity of growth among traits. In concordance with other analyses on growth in these populations, our results suggest that there exist relative differences in patterns of growth between Chlorocebus populations, further suggesting selection for unique developmental pathways in each

The static allometry of sexual and non-sexual traits in vervet monkeys

Sexual traits vary tremendously in static allometry. This variation may be explained in part by body size-related differences in the strength of selection. We tested this hypothesis in two populations of vervet monkeys, using estimates of the level of condition dependence for different morphological traits as a proxy for body size-related variation in the strength of selection. In support of the hypothesis, we found that the steepness of allometric slopes increased with the level of condition dependence. One trait of particular interest, the penis, had shallow allometric slopes and low levels of condition dependence, in agreement with one of the most consistent patterns yet detected in the study of allometry, namely that of genitalia exhibiting shallow allometries.This research was supported by NIH grant R01RR0163009

Prescribed minimum benefits – quagmire or foundation for social health reform?

No Abstract South African Medical Journal Vol. 97 (6) 2007: pp. 446-45

Gravity separator performance evaluation using Qemscan® particle mineral analysis

In a gravity separation device, particle shape, size and density all play a role. The combination of these determines where each individual particle reports to in the viscous fluid, where particle crowding (solids to water ratio) also plays a role. To understand the performance of gravity separation devices in the heavy mineral industry, these particle characteristics need to be measured. There are various challenges in analysing particle density and particle size simultaneously for the purpose of quantifying gravity separator performance, not to mention particle shape. These analytical challenges include the high cost of high-density sink-float fractionation, toxicity of high-density sink-float media, inability of sink-float media to fractionate at densities greater than 4.0 g/cm3, and the time-intensive nature of these fractionations. The use of the detailed particle-by-particle output from Qemscan® particle mineral analyses (PMA) as a fast and cost-effective alternative is evaluated. The size and density outputs from the Qemscan® were employed to characterize the performance of a heavy mineral spiral concentrator as an example. Critical analytical requirements are to be addressed before the Qemscan® output data can be utilized.This paper was first presented at the, Heavy Minerals Conference, ‘What next?’, 20–23 September 2009, Champagne Sport Resort, Drakensberg.http://www.saimm.co.za/ai201

Flight operational considerations during airfield design

Paper presented at the 33rd Annual Southern African Transport Conference 7-10 July 2014 "Leading Transport into the Future", CSIR International Convention Centre, Pretoria, South Africa.In the past airfields were designed and built by architectural and engineering companies without due regard and consideration to flight operational requirements. This deficiency was recognized by the International Civil Aviation Organization (ICAO) and the International Federation of Air Line Pilots (IFALPA). Both leading aviation controlling bodies advocated the incorporation of flight operational considerations in the overall airfield layout and pavement design. Pertinent issues to be addressed in the paper include: approach light system design and consideration, aircraft maneuvering area design and construction, taxiway and runway markings, runway skid resistance, runway length and width consideration, runway end safety area (RESA) and safety strip considerations, rapid exit taxiway designs, apron lighting, taxiway design consideration and control over foreign object debris (FOD). Some case studies (e.g. King Shaka International Airport, OR Tambo International Airport, Lanseria International, Arusha and Mwanza Regional Airports, East London, Nairobi and Kilimanjaro International Airports) will be used to illustrate that by proper consideration to the flight operations factor, these airports could have been planned and designed/upgraded/maintained in a much more efficient and safe manner, that could have ensured an increased availability factor. Major high risk pavement failures have been recorded (asphalt surfacing being blown out and loose stones) by not considering aircraft related factors (jet blast, oil spillages).This paper was transferred from the original CD ROM created for this conference. The material was published using Adobe Acrobat 10.1.0 Technology. The original CD ROM was produced by CE Projects cc. Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: [email protected]

Strengthening intellectually challenged adolescents’ sense of self: An appreciative inquiry mixed-methods intervention

Background: Individuals with intellectual challenges may experience a sense of isolation within their families. How their families and friends react towards these challenges influences the formation of their identity and self-acceptance significantly. Aim: The aim of this research was to explore and describe how the sense of self of intellectually challenged adolescents could be strengthened within familial relationships and to evaluate the effectiveness of appreciative inquiry as an intervention approach. Setting: The study was conducted with families at a school for children with intellectual disabilities in the Ekurhuleni Metropolitan Area, Northern Region of Gauteng, South Africa. Methods: In an embedded mixed-method approach, a sample of 24 intellectually challenged adolescents and their families were selected, tested and interviewed. Quantitative data were collected using the BarOn Emotional Quotient Inventory (BarOn EQ-i:YV) on adolescents and the Family Environmental Scale (FES) on families in the experimental and control groups, before and after intervention. Qualitative data were gathered through an appreciative inquiry intervention and semi-structured interviews with adolescents in the experimental group. Results: Although the quantitative findings were not statistically significant, the qualitative findings indicated that adolescents and family members experienced the sense of self of intellectually challenged adolescents positively, rather than as ‘disabled’. The appreciative inquiry shows potential to strengthen intellectually challenged adolescents’ sense of self in a supportive, positive family environment. Conclusion: The research is valuable in the way it highlights the importance of relational research in cases where quantitative research does not seem to be effective

HIV prevention trial design in an era of effective pre-exposure prophylaxis

Pre-exposure prophylaxis (PrEP) has demonstrated remarkable effectiveness protecting at-risk individuals from HIV-1 infection. Despite this record of effectiveness, concerns persist about the diminished protective effect observed in women compared with men and the influence of adherence and risk behaviors on effectiveness in targeted subpopulations. Furthermore, the high prophylactic efficacy of the first PrEP agent, tenofovir disoproxil fumarate/emtricitabine (TDF/FTC), presents challenges for demonstrating the efficacy of new candidates. Trials of new agents would typically require use of non-inferiority (NI) designs in which acceptable efficacy for an experimental agent is determined using pre-defined margins based on the efficacy of the proven active comparator (i.e. TDF/FTC) in placebo-controlled trials. Setting NI margins is a critical step in designing registrational studies. Under- or over-estimation of the margin can call into question the utility of the study in the registration package. The dependence on previous placebo-controlled trials introduces the same issues as external/historical controls. These issues will need to be addressed using trial design features such as re-estimated NI margins, enrichment strategies, run-in periods, crossover between study arms, and adaptive re-estimation of sample sizes. These measures and other innovations can help to ensure that new PrEP agents are made available to the public using stringent standards of evidence

Morphological variation in the genus Chlorocebus: Ecogeographic and anthropogenically mediated variation in body mass, postcranial morphology, and growth

Objectives Direct comparative work in morphology and growth on widely dispersed wild primate taxa is rarely accomplished, yet critical to understanding ecogeographic variation, plastic local variation in response to human impacts, and variation in patterns of growth and sexual dimorphism. We investigated population variation in morphology and growth in response to geographic variables (i.e., latitude, altitude), climatic variables (i.e., temperature and rainfall), and human impacts in the vervet monkey (Chlorocebus spp.). Methods We trapped over 1,600 wild vervets from across Sub‐Saharan Africa and the Caribbean, and compared measurements of body mass, body length, and relative thigh, leg, and foot length in four well‐represented geographic samples: Ethiopia, Kenya, South Africa, and St. Kitts & Nevis. Results We found significant variation in body mass and length consistent with Bergmann\u27s Rule in adult females, and in adult males when excluding the St. Kitts & Nevis population, which was more sexually dimorphic. Contrary to Rensch\u27s Rule, although the South African population had the largest average body size, it was the least dimorphic. There was significant, although very small, variation in all limb segments in support for Allen\u27s Rule. Females in high human impact areas were heavier than those with moderate exposures, while those in low human impact areas were lighter; human impacts had no effect on males. Conclusions Vervet monkeys appear to have adapted to local climate as predicted by Bergmann\u27s and, less consistently, Allen\u27s Rule, while also responding in predicted ways to human impacts. To better understand deviations from predicted patterns will require further comparative work in vervets