International Journal of Information Science and Management
Volume:4 Issue: 1, Jan-Jun 2006

In recent years, machine vision and optical sensors, which can be used in an autonomous weed killing equipment, are being used extensively to detect weeds from crops. In this study, seven types of weeds that grow in most of the sugar beet fields in Iran, especially in Fars province, were considered in real outdoor conditions. Several color feature extraction algorithms have also been investigated to separate soil from the plants as well as weeds from the sugar beets. The performance of the proposed algorithm was evaluated by determining correct classification rates (CCR) and misclassification rates (MCR) of the results. The findings revealed that the proposed method could successfully detect five of the seven types of the weeds, including Chenopudium album L., Amaranthus retrofelexus L., Physalis alkekengi L., Convolvulus arvensis L., Setaria vertidis L. Beauv and Echinochloa crus-gali (L.) Beauv.

In order to make the best utilization of a link in computer networks, Active Queue Management (AQM) algorithms are generally used in a variety of methods. In this paper, a systematic control strategy based on self-scheduled H∞, considering the dynamics of the window-based TCP flow, is proposed. Then, the robustness of the designed controller to disturbance and parameter fluctuations of the plant is shown via simulation results.

One of the most effective techniques to mitigate multipath fading and inter-cell interference at a downlink wireless channel in WCDMA systems for achieving high capacity is transmitter power control. In this case, system increases the power of the subscriber when its interference increases in order to satisfy the requested signal qualities. However, when the requested signal qualities are infeasible, the power control algorithms might diverge as a result of power limitation. Another way to mitigate multipath problems is using diversity techniques. Space-time diversity offers an advantage in the forward link of the WCDMA system. In this paper, three environments for forward link power control, together with space-time diversity, are examined. These are indoor office, indoor-outdoor pedestrian and vehicular environments. The simulator takes into account 19 hexagonal cells with spatially uniform user distribution and a propagation channel characterized by distance attenuation, fast Rayleigh fading and inter-cell interference. Computer simulations are given to evaluate the effect of space-time diversity on convergence of downlink power control algorithms. Simulation results show that space-time diversity together with downlink power control have very good performance, especially in the vehicular environments with high mobile speed.

Digital libraries offer opportunities for e-learning that are not possible in their physical counterparts. Digital libraries complement other learning environments, such as those provided in distance education and courses offered online. Like e-learning environments, they provide flexibility of time and place. Digital libraries have the potential to offer unprecedented resources to support e-learning. Access to current research and needed information within a well-developed infrastructure can provide faculty members and students with a unique opportunity to carry out deep research and to teach and learn more thoroughly. The paper addresses and discusses the following items: What is meant by “e-learning” and how can it be supported by library environment; what the functionality of the digital library is and how the e-learning resources are included and organized in a digital library. This paper will also explore the advantages of digital libraries for e-learning and the types of learning that can be supported by them. There is undoubtedly a keenness to use online information resources for research and teaching, but this seems to be matched by a lack of awareness of how best to integrate these resources into the e-learning environment. This paper concludes with a discussion of the role and influence of the digital libraries and online resources on e-learning.

In this research the degree to which search abilities have been inserted into the search engines of Persian and non-Persian E-Journals has been investigated. 97 Persian E-Journals (PEJ) and 30 non-Persian, in this case English, E-Journals (EEJ) represent the research population. The required data were gathered through designing a checklist, which was filled out for each PEJ and EEJ. The results of the study showed that neither PEJs nor EEJs reached the standards of search abilities set for search engines. In all, EEJs’ search engines by 37.9 percent insertion of search abilities in their search engines witness a better condition than PEJ’s search engines.

In this paper an attempt has been made to show how information technology (IT) is used as a strategic tool to meet competitive advantages and how it is rapidly becoming a necessary ingredient for achieving quality within the service industry. An in-depth review of information requirements for service sectors has been made and the possible relationships between IT and typology of service organizations, service quality and improving market position have been highlighted. Also, integration of IT and service dimensions has been addressed and some important issues required for a successful integration have been proposed. The findings indicate that different types of service operations require different levels of IT. Authors have also emphasized that IT plays an important role in the service industry, especially in financial and healthcare sectors and it will continue to increase in importance as managers further appreciate the benefits that can be gained, as IT is treated as a strategic issue and as the complexities of a large network, demand increased capabilities in information management.

This article aims at reviewing the curricula related to the discipline of Library and Information Sciences, M. A. level, exercised since 1967 In Iran. Changes and modifications in these programs will be focused on. The main points in the program used since 1978 together with ways of implementing them in any of the 7 subdisciplines of this major will also be discussed. Later, the reasons behind using or ignoring certain courses will also be explained. It will be mentioned that basic courses, in this discipline, must not be put aside as Information Technology is gaining an everincreasing importance; because, such a phenomenon will question the existance of faculties running such courses, at M. A. level, alltogether.