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The ISBSG Software Project Repository: An Analysis from Six Sigma Measurement Perspective for Software Defect Estimation

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Journal of Software Engineering and Applications 2017年第8期10卷 693-720页

作者： mhammed almakadmeh Alain Abran cole de Technologie Supérieure Université du Québec Montréal Canada

The International Software Benchmarking Standards Group (ISBSG) provides to researchers and practitioners a repository of software projects’ data that has been used to date mostly for benchmarking and project estimation purposes, but rarely for software defects analysis. Sigma, in statistics, measures how far a process deviates from its goal. Six Sigma focuses on reducing variations within processes, because such variations may lead to an inconsistency in achieving projects’ specifications which represent “defects”, which mean not meeting customers’ satisfaction. Six Sigma provides two methodologies to solve organizations’ problems: “Define-Measure-Analyze-Improve-Control” process cycle (DMAIC) and Design of Six Sigma (DFSS). The DMAIC focuses on improving the existed processes, while the DFSS focuses on redesigning the existing processes and developing new processes. This paper presents an approach to provide an analysis of ISBSG repository based on Six Sigma measurements. It investigates the use of the ISBSG data repository with some of the related Six Sigma measurement aspects, including Sigma defect measurement and software defect estimation. This study presents the dataset preparation consisting of two levels of data preparations, and then analyzed the quality-related data fields in the ISBSG MS-Excel data extract (Release 12 - 2013). It also presents an analysis of the extracted dataset of software projects. This study has found that the ISBSG MS-Excel data extract has a high ratio of missing data within the data fields of “Total Number of Defects” variable, which represents a serious challenge when the ISBSG dataset is being used for software defect estimation.

关键词： ISBSG Six Sigma Defect Estimation DMAIC Design for Six Sigma COSMIC Function Points

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An Efficient Key Management Scheme for Hierarchical Wireless Sensor Networks

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Wireless Sensor Network 2012年第6期4卷 155-161页

作者： Benamar Kadri Djilalli Moussaoui Mohammed Feham Abdellah mhammed STIC Lab. Department of Telecommunications University of Tlemcen Tlemcen Algeria Telecom SudParis Evry France

The recent advances in integrated circuit technologies, microprocessor hardware, wireless communications, embedded systems and technologies as well as the emergence of Ad-hoc networking, made up the concept of wireless sensor networks. Regarding the nature of sensors and the nature of the environment of deployment sensor networks are exposed to many attacks more than any other networks, therefore new strategies and protocols of security must be defined for these networks taking into consideration the characteristics of sensors as well as the architecture of the network. In this paper we propose a lightweight implementation of public key infrastructure called cluster based public infrastructure (CBPKI), CBPKI is based on the security and the authenticity of the base station for executing a set of handshakes intended to establish session keys between the base station and sensors over the network used for ensuring data confidentiality and integrity.

关键词： WSN Security PKI CBPKI Clustering Key Management

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Effect of SrO on the Structure of Apatite and Wollastonite Phases of Na2O-CaO-SiO2-P2O5Glass System

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New Journal of Glass and Ceramics 2021年第2期11卷 45-56页

作者： Gomaa El Damrawi Rawya mhammed Ramadan Mohamed El Baiomy Glass Research Group Physics Department Faculty of Science Mansoura University Mansoura Egypt Microwave Physics and Dielectrics Department Physics Research Division National Research Centre Cairo Egypt

Glasses in the system 24.5Na2O·24.5CaO·6P2O5·xSrO·(45-x)SiO2 have been studied in the composition region of x = 0 - 15 mol%. The as prepared glasses are transparent and have an amorphous network structure. On the otherhand, heat treated glasses are transformed to opaque white glass ceramic characterized by their highly crystalline network structure. Crystalline apatite (calcium phosphate, Ca3(PO4)2, wollastonite (calcium silicate, CaSiO3), and strontium calcium phosphate Ca2Sr(PO4)2 are the main well-formed cry

关键词： Structure Physical Properties Gasses Glass Ceramics

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Pulmonary Tuberculosis in Morocco: A Two Year Retrospective Study

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Journal of Tuberculosis Research 2018年第1期6卷 104-111页

作者： Hanaa Mouchrik Abdelmajid Soulaymani mhammed Jabri Hinde Hami Abdelrhani Mokhtari Laboratory of Genetics and Biometry Faculty of Science Ibn Tofail University Kenitra Morocco Diagnostic Center of Tuberculosis and Respiratory Diseases Kenitra Morocco

OBJECTIVES: To determine the epidemiological features of pulmonary tuberculosis in the region of Gharb-Chrarda-Beni-Hssen in Morocco. METHODS: This is a retrospective study of pulmonary tuberculosis cases, diagnosed and treated at the regional diagnostic center of tuberculosis and respiratory diseases (RDCTRD) in Kenitra between January 2010 and December 2011. RESULTS: During the study period, there were 456 cases diagnosed with pulmonary tuberculosis at the RDCTRD, accounting for 51.3% of all tuberculosis cases reported during this period. More than two-thirds were men (69%), with a male-female ratio of 2.22 and 3.3% of cases were children under the age of 15 years. The average age of the patients was 37.07 ± 0.78 years. The average body weight at diagnosis of tuberculosis was 56.20 ± 0.55 kg for all patients. According to the results, 89% of pulmonary tuberculosis cases were microscopically positive. The majority of patients (80.3%) showed signs of tuberculous impregnation. Nearly three-quarters of these cases (71%) were smokers, 21% were cannabis addicts and 7% were alcoholics. Among the 427 cases for whom the outcome was known, 3 (0.7%) of them died. CONCLUSION: Tuberculosis can be controlled by preventing transmission and infection, by stopping the progression from latent infection to active tuberculosis, and by treating active disease.

关键词： Pulmonary Tuberculosis Infection Epidemiology Retrospective Study Morocco

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Rating of CCR5-Delta 32 Homozygous Mutation in Sudanese HIV Patients and Sex Workers

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World Journal of AIDS 2022年第2期12卷 55-64页

作者： Mawaib Hassan Fath-Elrahman Mubarak Alkarsany Bakri Yousif Mohammed Nour Adam Dawoud Abakar Abdelrahman Eldaw mhammed Salaheldein Gumma Elzaki Eman Osman Mubarak Elshafia Elhadi Abdalla Ahmed Department of Virology National Public Health Laboratory Khartoum Sudan Department of Medical Laboratory Sciences Karary University Khartoum Sudan Department of Medical Parasitology Faculty of Medical Laboratory Sciences University of Gezira Wad Medani Sudan Department of Medical Microbiology Faculty of Medical Laboratory Sciences University of Gezira Wad Medani Sudan Molecular Biology Laboratory Department of Epidemiology Tropical Medicine Research Institute Khartoum Sudan National Tuberculosis Reference Laboratory National Public Health Laboratory Khartoum Sudan Department of Haematology and Immunohaematology Faculty of Medical Laboratory Sciences University of Gezira Wad Medani Sudan

Background: Prevention against human immunodeficiency virus (HIV) includes natural resistance in the population;mainly frequency of cysteine-cysteine chemokine receptor type-5 (CCR5-delta 32 mutation). By knowing the frequency of this resistance in the community, the proportion of the population susceptible to infection can be determined. This study aimed to detect for the first time the rate of CCR5-delta 32 mutation in Sudanese individuals with HIV and sex workers. Methods: Cross-sectional study was followed in the parade from 2019 through 2021, study groups were Sudanese with HIV and sex workers. Sero-negativity of sex workers was confirmed by a rapid immunochromatography test (ICT). A blood sample was targeted for DNA isolation. PCR amplification was accomplished for CCR5 wild type and CCR5-delta 32 mutation genes using specific primers. Result: Among HIV patients, males, basic education level and ages below 60 years were commonly recorded while ages below 40 years, secondary education level and single marital status were predominated in sex workers. All HIV patients were positive for CCR5 wild type and negative for CCR5-delta 32 genotype. The sex workers group showed a frequency of 3.5% (97/200) for homozygous CCR5-delta 32 mutation. Conclusion: The rating of homozygous CCR5-delta 32 genotype in studied Sudanese sex workers was relatively more than other results obtained from African countries, and the mutation was significantly detected among sex workers group (P value = 0.008) when compared to the studied HIV group.

关键词： CCR5-Delta 32 HIV Sex Workers Rating Sudan

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