This paper examines the importance of trust factors in the development and adoption of internet based cultural information systems. The proposed trust model identifies the relationship between user communication goals...
详细信息
Information system security is critical to meet the growing technological needs for the industry. Information security education is necessary to support such need. However security education depends on real project co...
详细信息
Information system security is critical to meet the growing technological needs for the industry. Information security education is necessary to support such need. However security education depends on real project context. In this article, we address the educational challenges in teaching information and software system security by presenting an education framework governed by context-driven action research used for developing modules in specific regular and distance learning programs. We differentiate issues relating to both regular and distance learning program.
Admission control in wired networks has been traditionally used as a way to control traffic congestion and guarantee quality of service. Here, we propose an admission control mechanism which aims to keep the power con...
详细信息
This paper investigates the performance of SAPFs (shunt active power filters) which are introduced in order to address the quality issues in electrified railway supply systems. These filters can be installed at eith...
详细信息
This paper investigates the performance of SAPFs (shunt active power filters) which are introduced in order to address the quality issues in electrified railway supply systems. These filters can be installed at either the S/S (substation) end or at the SP (sectioning post) of the railway feeding power system. In this investigation novel control algorithms, based on the synchronously rotating frame of reference, are proposed for the case when the SAPF is installed at the substation end and its performance is assessed. The effectiveness of the proposed control algorithms are illustrated via Matlab/SimPower computer simulations and validated via comparisons with other publications. This investigation demonstrated that when the SAPF is installed at the substation side, it can effectively compensate for the higher harmonic supply current. In addition, the reactive power demand is fully compensated for, leading to close to unity power factor. However, the voltage drop/sag at the locomotive power supply feed point is only partially compensated for.
Cloud computing is without a doubt one of the most significant innovations presented in the global technological map. The number of potential users enrolling and using cloud services increases exponentially on a daily...
详细信息
This paper details a newly developed prototype which combines three functions: day-lighting, solar powered LED lighting and natural ventilation for the public bathhouses (known as hammams) of the heritage cities of No...
详细信息
This paper details a newly developed prototype which combines three functions: day-lighting, solar powered LED lighting and natural ventilation for the public bathhouses (known as hammams) of the heritage cities of North Africa. The prototype was developed as a result of an extensive architectural survey of 67 surviving historic baths in North African cities, during which a common problem of poor natural lighting and ventilation as well as inadequate electric lighting was identified. Combining the vernacular element of hammam day-lighting with solar powered night-lighting, the prototype was developed between August 2012 and March 2013 as part of a research project funded by Manchester University. Tests have been carried out on the roof of two hammams located in Fez, Morocco: hammams Seffarine (currently being rehabilitated) and Moulay Idriss (functioning). Results show that the prototype dramatically improves the day-lighting qualities in the bathing spaces and provides for up to 8 hours of continuous night solar powered electric lighting. Positive feedback has been received from the users and the manager of hammam Moulay Idriss on demonstrating the prototype. The paper argues that the combination of a vernacular element with an affordable high-tech solution results in an innovative hybrid system that is user friendly, and sensitive to heritage buildings. Such a solution can act as a “green catalyst” by its adoption in the 4000 traditional Moroccan hammams. As these hammams continue to provide a facility for the population living inside the medinas, the adoption of this design will not only contribute to reducing energy consumption and using renewable sources of energy but will also help to sustain a traditional social and cultural practice which has supported the health and well-being of the population for many centuries.
Electrical resistivity technique has become a popular alternative tool by the geotechnical engineers in subsurface investigation. This study presents the influence of soil electrical resistivity value(ERV) due to the ...
详细信息
Electrical resistivity technique has become a popular alternative tool by the geotechnical engineers in subsurface investigation. This study presents the influence of soil electrical resistivity value(ERV) due to the different types of electrical resistivity array used in practice. The dissimilarity of ERV was become a popular debate by the engineers which posses less fundamental knowledge in this area. In the past, the theory of electrical resistivity technique was less being discovered by the engineer which creates lots of black boxes during the utilization of electrical resistivity method(ERM) in engineering purposes. Hence, the result which produced from the ERM was difficult to deliver in a sound of definitive ways due to lack of knowledge and experienced of most engineers. Hence, this study presents the influence of soil ERV due to the different types of array used with particular reference to as Dipole-dipole and Pole-dipole. A line of electrical resistivity imaging was performed on small embankment of sandy and lateritic soil with different types of array using ABEM SAS(4000) equipment. Three in line of soil samples were tested for moisture content(w) test immediately after the electrical resistivity data acquisition was completely measured. Moreover, particle size distribution test also was performed for all soil samples in order to support the findings. It was found that the ERV was never be the same for each types of array used even on the same particular location of the survey line. However, it was found that there was a consistent relationship between ERV and moisture content for both types of soil tested which can be represent by ERV ∞ 1/w. Hence, it was found that ERV produced was relative to the types of array used during the field measurement. Each types of array were applicable to be used in subsurface profiling and its selection was subjected to the target of interest.
Electrical resistivity technique has become a famous alternative tool in subsurface characterization. In the past, several interpretations of electrical resistivity results were unable to be delivered in a strong just...
Electrical resistivity technique has become a famous alternative tool in subsurface characterization. In the past, several interpretations of electrical resistivity results were unable to be delivered in a strong justification due to lack of appreciation of soil mechanics. Traditionally, interpreters will come out with different conclusion which commonly from qualitative point of view thus creating some uncertainty regarding the result reliability. Most engineers desire to apply any techniques in their project which are able to provide some clear justification with strong, reliable and meaningful results. In order to reduce the problem, this study presents the influence of basic physical properties of soil due to the electrical resistivity value under loose and dense condition. Two different conditions of soil embankment model were tested under electrical resistivity test and basic geotechnical test. It was found that the electrical resistivity value (ERV, ρ) was highly influenced by the variations of soil basic physical properties (BPP) with particular reference to moisture content (w), densities (ρbulk/dry), void ratio (e), porosity (η) and particle grain fraction (d) of soil. Strong relationship between ERV and BPP can be clearly presents such as ρ ∞ 1/w, ρ ∞ 1/ρbulk/dry, ρ ∞ e and ρ ∞ η. This study therefore contributes a means of ERV data interpretation using BPP in order to reduce ambiguity of ERV result and interpretation discussed among related persons such as geophysicist, engineers and geologist who applied these electrical resistivity techniques in subsurface profile assessment.
For software systems that process and manage sensitive information, compliance with laws has become not an option but a necessity. Analysing relevant laws and aligning them with the system requirements is necessary fo...
详细信息
暂无评论