South African Computer Journal最新文献_第9页

Applying long short-term memory recurrent neural networks to intrusion detection 长短期记忆递归神经网络在入侵检测中的应用

South African Computer Journal Pub Date : 2015-07-11 DOI: 10.18489/SACJ.V56I1.248

R. C. Staudemeyer

{"title":"Applying long short-term memory recurrent neural networks to intrusion detection","authors":"R. C. Staudemeyer","doi":"10.18489/SACJ.V56I1.248","DOIUrl":"https://doi.org/10.18489/SACJ.V56I1.248","url":null,"abstract":"We claim that modelling network trac as a time series with a supervised learning approach, using known genuine and malicious behaviour, improves intrusion detection. To substantiate this, we trained long short-term memory (LSTM) recurrent neural networks with the training data provided by the DARPA / KDD Cup ’99 challenge. To identify suitable LSTM-RNN network parameters and structure we experimented with various network topologies. We found networks with four memory blocks containing two cells each oer a good compromise between computational cost and detection performance. We applied forget gates and shortcut connections respectively. A learning rate of 0.1 and up to 1,000 epochs showed good results. We tested the performance on all features and on extracted minimal feature sets respectively. We evaluated dierent feature sets for the detection of all attacks within one network and also to train networks specialised on individual attack classes. Our results show that the LSTM classier provides superior performance in comparison to results previously published results of strong static classiers. With 93.82% accuracy and 22.13 cost, LSTM outperforms the winning entries of the KDD Cup ’99 challenge by far. This is due to the fact that LSTM learns to look back in time and correlate consecutive connection records. For the rst time ever, we have demonstrated the usefulness of LSTM networks to intrusion detection.","PeriodicalId":55859,"journal":{"name":"South African Computer Journal","volume":"56 1","pages":"136-154"},"PeriodicalIF":0.0,"publicationDate":"2015-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67992653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 152

Block RAM-based architecture for real-time reconfiguration using Xilinx® FPGAs 基于块ram的架构，使用Xilinx®fpga进行实时重构

South African Computer Journal Pub Date : 2015-07-11 DOI: 10.18489/SACJ.V56I1.252

Rikus le Roux, G. V. Schoor, P. V. Vuuren

{"title":"Block RAM-based architecture for real-time reconfiguration using Xilinx® FPGAs","authors":"Rikus le Roux, G. V. Schoor, P. V. Vuuren","doi":"10.18489/SACJ.V56I1.252","DOIUrl":"https://doi.org/10.18489/SACJ.V56I1.252","url":null,"abstract":"Despite the advantages dynamic reconfiguration adds to a system, it only improves system performance if the execution time exceeds the configuration time. As a result, dynamic reconfiguration is only capable of improving the performance of quasi-static applications. In order to improve the performance of dynamic applications, researchers focus on improving the reconfiguration throughput. These approaches are mostly limited by the bus commonly used to connect the configuration controller to the memory, which contributes to the configuration time. A method proposed to ameliorate this overhead is an architecture utilizing localised block RAM (BRAM) connected to the configuration controller to store the configuration bitstream. The aim of this paper is to illustrate the advantages of the proposed architecture, especially for reconfiguring real-time applications. This is done by validating the throughput of the architecture and comparing this to the maximum theoretical throughput of the internal configuration access port (ICAP). It was found that the proposed architecture is capable of reconfiguring an application within a time-frame suitable for real-time reconfiguration. The drawback of this method is that the BRAM is extremely limited and only a discrete set of configurations can be stored. This paper also proposes a method on how this can be mitigated without affecting the throughput.","PeriodicalId":55859,"journal":{"name":"South African Computer Journal","volume":"56 1","pages":"22-32"},"PeriodicalIF":0.0,"publicationDate":"2015-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67992965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

A social representations analysis of design science research 设计科学研究的社会表征分析

South African Computer Journal Pub Date : 2015-07-11 DOI: 10.18489/SACJ.V56I1.274

R. Naidoo, A. V. D. Merwe, A. Gerber, A. Hevner

{"title":"A social representations analysis of design science research","authors":"R. Naidoo, A. V. D. Merwe, A. Gerber, A. Hevner","doi":"10.18489/SACJ.V56I1.274","DOIUrl":"https://doi.org/10.18489/SACJ.V56I1.274","url":null,"abstract":"Design science research (DSR) is a relatively unfamiliar research paradigm within the computing field in South Africa. In light of recent interest in this paradigm, this study sought to explore DSR perspectives among local computing researchers. Key theoretical concepts from social representations theory (SRT) such as anchoring and objectification were used to explore how researchers construct their understanding of DSR. A visual approach was used to administer drawing and association tasks to two focus groups; each focus group comprised around 25 participants ranging from doctoral students to experienced researchers. The focus group discussions invoked interesting complementary and distinctive associations about the process and content of DSR – anchored in dominant and conventional research practices. The results also illustrated several ways in which DSR is objectified by the researchers in drawings and metaphorical constructions. We conclude that SRT is useful for exploring beliefs about novel and relatively unfamiliar research practices. This study contributes to an enhanced understanding of how computing researchers go about making sense and assigning meaning to changing research practices. The findings are developed into recommendations for introducing changes to research practices. These recommendations can be used to direct efforts to more appropriately accommodate changing research practices within the computing community to broaden knowledge generation.","PeriodicalId":55859,"journal":{"name":"South African Computer Journal","volume":"56 1","pages":"33-49"},"PeriodicalIF":0.0,"publicationDate":"2015-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67993978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Burning money with firewalls 用防火墙烧钱

South African Computer Journal Pub Date : 2015-07-11 DOI: 10.18489/SACJ.V56I1.322

R. C. Staudemeyer, James Connan

引用次数: 0

Editorial: Strong Growth 社论:强劲增长

South African Computer Journal Pub Date : 2015-07-11 DOI: 10.18489/sacj.v56i1.336

P. Machanick

引用次数: 0

The factors that influence customer e-services adoption 影响客户采用电子服务的因素

South African Computer Journal Pub Date : 2015-07-11 DOI: 10.18489/SACJ.V56I1.209

K. Persad, Keshnee Padayachee

引用次数: 7

Identifying attributes of GPU programs for difficulty evaluation 识别GPU程序的属性以进行难度评估

South African Computer Journal Pub Date : 2014-08-29 DOI: 10.18489/sacj.v53i0.195

Dale Tristram, K. Bradshaw

引用次数: 0

Editorial: Steady Growth 社论:稳定增长

South African Computer Journal Pub Date : 2014-06-29 DOI: 10.18489/SACJ.V52I0.262

P. Machanick

引用次数: 0

Ringing the changes: editorial 敲响变化的钟声:社论

South African Computer Journal Pub Date : 2013-07-01 DOI: 10.18489/sacj.v50i1.180

P. Machanick

引用次数: 0

Guest Editorial: HISA Special Section 嘉宾评论:HISA特别组

South African Computer Journal Pub Date : 2013-07-01 DOI: 10.18489/sacj.v50i1.181

N. Mostert-Phipps, A. Maeder

引用次数: 0