Archives Des Sciences Journal (ADS )


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Publications in this journal

  • Archives Des Sciences Journal 09/2013; 66(9).
  • Archives Des Sciences Journal 07/2013; 66(7):100-115.
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    ABSTRACT: Activity networks have been used to model complex projects with wide applications in the field of production, construction, planning, controlling and generally in large projects. We are interested to determine the completion time of the project network when the duration of some or all activities are random variables. Stochastic activity networks can be represented by a priori cumulative distribution functions such as: exponential, Erlang, gamma, normal and others. In the present work, we shall discuss the problem of determining the project completion time using a recursive method, when activity times follow the uniform distribution with two points, a and b, represent the range of the possible duration of an activity with all intermediate values y, , equality probable. Comparisons with other reprehensive distributions which discussed in literature, e.g., the exponential, Erang, Normal and others will be introduced. The major advantage of using the uniform distribution is considering two point estimates for each activity. That gives the manager a range of choosing the activity time rather than the distributions which give one point estimate like the exponential and the normal distribution. Mathematica 7 codes are provided for the applications presented.
    Archives Des Sciences Journal 04/2013; Vol 66(4):115-134.
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    ABSTRACT: Risks in construction have become a serious consideration topic and plays a leading role in the modern corporation's plans. The construction projects encounter many challenges of risks in order to compete in the construction industry. The construction projects risk factors identified by literature review, primary interviews and pilot questionnaire and then evaluated according to their impacts on the projects. A field survey such as one-to-one interviews and questionnaires are carried out in the Oman construction industry involving three categories, Government (Clients), Contractors and Consultants. The risk factors will be prioritized according to the feedback of the questionnaire based on their overall effectiveness to achieve the planned targets of the projects. This paper additionally presents the use of analytical approach prior to explaining the different experiences in the implementation of risk management. The research approach is a deductive as it relies on data collected from primary and secondary sources. The methods used to this approach are a combination of quantitative and qualitative methods to analyze the data collected. It is expected that the output of this research will assist in prioritizing the risks so that the most significant one are promptly taken under consideration. This will have a good and beneficial contribution to save time and money for both public and private sectors in Oman due to expected awareness and improvements in the risk management procedures.
    Archives Des Sciences Journal 02/2013; 66(2):11.
  • Archives Des Sciences Journal 02/2013; 66(2):78-86.
  • Archives Des Sciences Journal 01/2013; 66(1):16-23.
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    ABSTRACT: The presence of co-morbid substance use disorders in patients with severe mental illness is common. Unfortunately, often neither of the illnesses has been identified, and when one illness is recognized, the other disorder may remain overlooked and untreated. Our study aims at studying the prevalence of dual diagnosis of substance abuse and severe mental illnesses with focus on patients with schizophrenia to describe profile of patients at risk. Materials: 683 psychiatric patients were recruited from el Mamoura Psychiatric Hospital and Alexandria University Hospital, they were assessed by the Arabic version of 6 item K6 scale, those scoring above 13 were submitted to a structured clinical interview SCID-I (Modules A-E), urine screening for drugs of abuse and complete history of substance abuse and other medical disciplines. Socio-demographic data were collected and analyzed to have a better description of profile of patients with dual diagnosis. Results: 22% of the sample fulfill the diagnosis of dual diagnosis. Results reveals higher risk for dual diagnosis in patients younger in age, single, low socioeconomic state and low level of education. Those having dual diagnosis tend to have early onset, longer duration of illness, poor compliance, higher rate of smoking and increased number of relapses. Paranoid schizophrenia were particularly at higher risk. Conclusion: Dual diagnosis is an important issue with no trans-cultural difference, that needs more focus in psychiatric settings. Awareness of psychiatrists about dual diagnosis and profile of patients at risk is highly recommended to enhance quality of mental health service. Key words: Dual diagnosis, Comorbidity, mental illness, affective, substance abuse, depression, Mania
    Archives Des Sciences Journal 01/2013; 66(2):206-216.
  • Archives Des Sciences Journal 01/2013;

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