A geopolitical analysis of long term internet network telescope traffic
- Authors: Irwin, Barry V W , Pilkington, Nick , Barnett, Richard J , Friedman, Blake
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428142 , vital:72489 , https://www.researchgate.net/profile/Barry-Ir-win/publication/228848896_A_geopolitical_analysis_of_long_term_internet_network_telescope_traffic/links/53e9c5190cf2fb1b9b672aee/A-geopolitical-analysis-of-long-term-internet-network-telescope-traffic.pdf
- Description: This paper presents results form the analysis of twelve months of net-work telescope traffic spanning 2005 and 2006, and details some of the tools developed. The most significant results of the analysis are high-lighted. In particular the bulk of traffic analysed had its source in the China from a volume perspective, but Eastern United States, and North Western Europe were shown to be primary sources when the number of unique hosts were considered. Traffic from African states (South Af-rica in particular) was also found to be surprisingly high. This unex-pected result may be due to the network locality preference of many automated agents. Both statistical and graphical analysis are present-ed. It is found that a country with a high penetration of broadband con-nectivity is likley to feature highly in Network telescope traffic, as are networks logically close to the telescope network.
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- Date Issued: 2007
A naive salience-based method for speaker identification in fiction books
- Authors: Glass, Kevin R , Bangay, Shaun D
- Date: 2007
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/432627 , vital:72888 , https://pubmed.ncbi.nlm.nih.gov/10350927/
- Description: This paper presents a salience-based technique for the annotation of directly quoted speech from fiction text. In particular, this paper determines to what extent a naïve (without the use of complex machine learning or knowledge-based techniques) scoring technique can be used for the identification of the speaker of speech quotes. The presented technique makes use of a scoring technique, similar to that commonly found in knowledge-poor anaphora resolution research, as well as a set of hand-coded rules for the final identification of the speaker of each quote in the text. Speaker identification is shown to be achieved using three tasks: the identification of a speech-verb associated with a quote with a recall of 94.41%; the identification of the actor associated with a quote with a recall of 88.22%; and the selection of a speaker with an accuracy of 79.40%.
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- Date Issued: 2007
Field testing the Alvarion BreezeMAX as a last mile access technology
- Authors: Siebörger, Ingrid , Terzoli, Alfredo
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428520 , vital:72517 , https://www.researchgate.net/profile/Ingrid-Sieboerger/publication/255048217_Field_testing_the_Alvarion_BreezeMAX_as_a_last_mile_access_technology/links/53ff2f290cf21edafd15bfad/Field-testing-the-Alvarion-BreezeMAX-as-a-last-mile-access-technology.pdf
- Description: With an alarmingly low teledensity of approximately 12% in South Afri-ca, and not much hope of further wired infrastructure at the local loop level–as the costs incurred are high compared to potential revenue–wireless connectivity could be a great asset and service in South Africa. This paper looks at how WiMAX technologies, and specifically the Al-varion BreezeMAX, could be used in providing much needed telecom-munications infrastructure to both rural and urban areas in South Africa, providing broadband data throughput rates together with excellent net-work reliability and low latency.
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- Date Issued: 2007
Hippocampus queenslandicus Horne, 2001–a new seahorse species or yet another synonym?
- Authors: Teske, Peter R , Lourie, Sara A , Matthee, Conrad A , Green, David M
- Date: 2007
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445666 , vital:74412 , https://www.publish.csiro.au/zo/ZO07021
- Description: During the past six years, 15 new seahorse species (Syngnathidae: Hippocampus) have been described on the basis of morphological characters. This approach is known to be problematic, and most species names in Hippocampus are now considered to be synonyms. Genetic methods have great potential to resolve the confused taxonomy of the genus, but none have yet been incorporated into species descriptions. In the present study, mitochondrial control region and cytochrome b DNA sequences, as well as morphological data from the recently described Queensland seahorse, Hippocampus queenslandicus Horne, 2001, were compared with corresponding data from closely related seahorse species to determine whether there is strong support for distinction of this taxon. The haplotypes of H. queenslandicus were nested among haplotypes belonging to two of the three major Southeast Asian lineages of H. spinosissimus Weber, 1913. Although incomplete lineage sorting characteristic of very recently diverged species cannot be ruled out, the genetic results suggest that H. queenslandicus is paraphyletic. Morphometric analysis further fails to provide strong support for the species status of H. queenslandicus. We conclude that support for the distinctness of H. queenslandicus is weak, and indicate that it is a synonym of H. spinosissimus. The taxonomic validity of other recently described seahorse species should be similarly scrutinised using combined genetic and detailed morphological methods.
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- Date Issued: 2007
Lack of genetic differentiation among four sympatric southeast African intertidal limpets (Siphonariidae): phenotypic plasticity in a single species?
- Authors: Teske, Peter R , Barker, Nigel P , McQuaid, Christopher D
- Date: 2007
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445461 , vital:74390 , https://doi.org/10.1093/mollus/eym012
- Description: Specimens of four sympatric intertidal limpet species (Siphonaria dayi, S. tenuicostulata, S. anneae and S. nigerrima) were collected from four localities on the east coast of South Africa and southern Mozambique. Their phylogenetic relationships were investigated using sequences of the mitochondrial COI gene and the intron-containing nuclear ATPSβ gene. Two closely related lineages were recovered, which grouped specimens on the basis of geography rather than morphology. One lineage was associated with the subtropical coastline of South Africa's east coast and the other with the tropical coastline of northeastern South Africa and southern Mozambique. This genetic discontinuity coincides with a biogeographic boundary located in the vicinity of Cape St Lucia. Combined genetic diversity of the four species was lower than that of three other southern African congeners, and fell within the range determined for single southern African marine mollusc species. We suggest that the four limpet species are in fact different morphotypes of a single species.
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- Date Issued: 2007
Phylogeographic structure of Octopus vulgaris in South Africa revisited: identification of a second lineage near Durban harbor
- Authors: Teske, Peter R , Oosthuizen, A , Papadopoulos, Isabelle , Barker, Nigel P
- Date: 2007
- Language: English
- Type: Article
- Identifier: vital:6544 , http://hdl.handle.net/10962/d1006000
- Description: In a previous study that investigated genetic structure of Octopus vulgaris along the South African coast by sequencing the mitochondrial cytochrome oxidase III gene (COIII), all sequences generated were identical. Such a finding is unusual, because mitochondrial DNA mutates quickly, and several marine invertebrates present in southern Africa show considerable genetic variation and structure. We reanalysed the samples using two different mitochondrial markers, namely cytochrome oxidase I (COI) and the large ribosomal subunit (16S rRNA). Sequences of both these markers showed variation. The conclusion of the previous study, that South Africa’s O. vulgaris population is characterised by a lack of genetic structure along the coast, is rejected. Some specimens from Durban (southeast Africa) were genetically more different from those found in the remainder of the country than were specimens from other regions (Tristan da Cunha and Senegal). We suggest that the lineage in Durban may have been recently introduced.
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- Date Issued: 2007
Phylogeographic structure of the caridean shrimp Palaemon peringueyi in South Africa: further evidence for intraspecific genetic units associated with marine biogeographic provinces
- Authors: Teske, Peter R , Froneman, P William , Barker, Nigel P , McQuaid, Christopher D
- Date: 2007
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445486 , vital:74392 , https://doi.org/10.2989/AJMS.2007.29.2.9.192
- Description: Recent genetic studies have shown that most widely distributed, passively dispersing invertebrates in southern Africa have regional intraspecific units that are associated with the three main marine biogeographic provinces (cool-temperate, warm-temperate and subtropical). The caridean shrimp Palaemon peringueyi also occurs in all three provinces, but the fact that it can disperse both actively and passively (i.e. larval drifting, adult walking/swimming and potential adult rafting by means of floating objects) suggests that the amount of gene flow between regions may be too high for evolutionary divergence to have taken place. Samples of P. peringueyi were collected throughout South Africa and an intraspecific phylogeny was reconstructed using mitochondrial COI and 16S rRNA sequences. Three major clades were recovered, which were broadly associated with the three biogeographic regions. This suggests that, even though P. peringueyi can disperse actively, the fact that neither larvae nor adults are strong swimmers has resulted in genetic subdivisons comparable to those of passively dispersing coastal invertebrates in southern Africa.
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- Date Issued: 2007
Shoprite Checkers National Treasurer's report
- Authors: SACCAWU
- Date: 2007
- Subjects: SACCAWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/153853 , vital:39530
- Description: Comrades, this historical 3rd National Summit is convened at a time when the National Democratic Revolution is under attack left, right and centre. We have recently held an ANC Policy Conference; SACP National Congress and COSATU Central Committee, as well as SACCAWU National Bargaining Conference. These Alliance meetings took a number of resolutions for implementation. One has observed a very sorry state of affairs in that some shopstewards who are seen to be very prominent in Shoprite meetings, do not attend SACCAWU structures, let alone COSATU, ANC & SACP structures. This Summit will have to discuss on how we are to revive structures at Shoprite and participation in the aforementioned structures.
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- Date Issued: 2007
Submerged membrane bioreactor and secondary digestion in the treatment of wine distillery waste: Part II: the effect of fungal pre-treatment on wine distillery wastewater digestion
- Authors: Melamane, Xolisa L , Strong, Peter James , Tandlich, Roman , Burgess, Jo E
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76150 , vital:30514 , https://www.prt-parlar.de/download_feb_2007/
- Description: The effect of fungal pre-treatment using Trametes pubescens on the anaerobic digestion ultrafiltration treatment of wine distillery wastewater (WDW) was studied. The downstream biological treatment system, consisting of four individual reactors, was operated for 30 days. pH buffering was achieved by mixing the pre-treated system feed with CaCO3 and K2HPO4; this proved significant for optimum performance of the system in removal of soluble chemical oxygen demand (CODS). The experimental system was shown to eliminate an average of 86 (± 4) % of CODS present in the pre-treated WDW. Treatment in a submerged membrane bioreactor (SMBR) and subsequent secondary digester, together with pH buffering using CaCO3 and K2HPO4, led to the stabilisation of CODS removal. The residual CODS levels in the final effluent were approximately 400 mg/l, significantly lower than the concentrations observed when treating raw WDW, indicating that fungal pre-treatment might have provided additional nutrients for removal of recalcitrant components of the wastewater. The resulting effluent of the system is rich in nitrates and phosphates. Together with the residual organic content it might be used as a fertiliser. Alternatively, if water management of the wine distillery is an issue, a membrane process, such as reverse osmosis or nanofiltration could be applied to bring the parameters of the water to meet the technological needs.
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- Date Issued: 2007
The biology and laboratory host range of the weevil, Listronotus marginicollis (Hustache)(Coleoptera: Curculionidae), a natural enemy of the invasive aquatic weed, parrot's feather, Myriophyllum aquaticum (Velloso) Verde (Haloragaceae).
- Authors: Oberholzer, I G , Mafokoane, D L , Hill, Martin P
- Date: 2007
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/451555 , vital:75059 , https://hdl.handle.net/10520/EJC32727
- Description: Myriophyllum aquaticum (Velloso) Verde (Haloragaceae), parrot's feather, is a rooted aquatic plant, with stems of up to 3 m long and leafy terminal shoots. The plant roots in shallow water to form a dense tangle of stems and roots. The shoots emerge 200-500 mm above the water surface (Cilliers 1999). The leaves of the plant are feathery and occur in whorls. The stem-boring weevil, Listronotus marginicollis (Hustache) (Coleoptera: Curculionidae), was next considered as the most promising additional biological control agent for the control of M. aquaticum in southern Africa (Cilliers 1999).
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- Date Issued: 2007
The effect of temperature and salinity on oxygen consumption in the brachyuran crab Cyclograpsus punctatus (Crustacea: Decapoda: Grapsidae)
- Authors: Winch, James W W , Hodgson, Alan N
- Date: 2007
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447426 , vital:74624 , https://doi.org/10.1080/15627020.2007.11407384
- Description: The aquatic oxygen consumption of the estuarine brachyuran crab, Cyclograpsus punctatus, was investigated after a 24-hour acclimation period at different temperature (12.5, 20, 30°C) and salinity (9, 17.5, 35, and 44°) combinations . Salinity had no significant effect on oxygen consumption at 12.5 and 20°C in both large and small crabs. At 30°C and 44°, however, the rate of oxygen consumption declined in large crabs (from 0.233 to 0.176 mg O2 g wwt/h) and increased in small crabs (0.300 to 0.469 mg O2 g wwt/h). There was also a significant increase in the oxygen consumption (0.300 to 0.536 mg O2 g wwt/h) of small crabs at the high temperature/low salinity combination. Temperature had a significant effect on the rate of oxygen consumption at all salinities, with Q10 values ranging from 1.16 to 2.85. In all cases the mass-specific oxygen consumption rate of small crabs was higher than that of large crabs. The results suggest that the confinement of this species to the lower reaches of estuaries may, in part, be due to physiological constraints on juveniles and small individuals.
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- Date Issued: 2007