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Search Results: 1 - 10 of 7619 matches for " Rahman Md. Ashikur "
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A Discussion of the Suitability of Only One vs More than One Theory for Depicting Corporate Governance  [PDF]
Abdullah Al Mamun, Qaiser Rafique Yasser, Md. Ashikur Rahman
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.41005

Agency theory predicts that the Chief Executive Officer (CEO) and the chairman positions should be held by different individuals in order to protect shareholder’s interest. Though there are mixed evidences on CEO duality and firm performance, most research have found that there is negative relationship between CEO duality and firm performance.  Although, in the last decades of the twentieth century, agency theory became the dominant force in the theoretical understanding of corporate governance, it does not however cover all aspects of corporate governance. This paper aims to explore whether it is better to combine various theories in order to describe effective and good corporate governance or theorizing corporate governance based on one theory only. This will cover corporate governance theories which include agency theory, stakeholder theory, stewardship theory, and institutional theory.

Rahman Md. Ashikur,Md. Hasanuzzaman,Rahman Md,Rahman Md. Mofizur
International Research Journal of Pharmacy , 2011,
Abstract: Phytochemical analysis of the dried leaves of Tabernaemontana divaricata (L). (Apocynaceae) indicated the presence of a steroids,tannins, saponins, gums and reducing sugar. The pharmacological interest of these compounds, coupled with the use of this plant in traditional medicine prompted the authors to check for its possible antibacterial activity. The extracts (ethanol, petroleum ether, diethyl ether, methanol and aqueous) were found to possess maximum potency against infectious pathogens Staphylococcus saprophyticus, Staphylococcus aureus, Enterococcus facealis, Staphylococcus pyogenes, Streptococcus agalactae, Salmonella typhi, Escherichia coli, Shigella boydii, Shigella dysenteriae and Pseudomonas aeruginosa. The zone of inhibition was observed with almost all bacteria with some exceptions. Minimum inhibitory concentrations of the extracts were found to be significant. The obtained results provide a support for the use of this plant in traditional medicine and its further investigation.
Enhanced Partial Dominant Pruning (EPDP) Based Broadcasting in Ad hoc Wireless Networks
Ashikur Rahman,Md. Endadul Hoque,Farzana Rahman,Sabuj Kumar Kundu
Journal of Networks , 2009, DOI: 10.4304/jnw.4.9.895-904
Abstract: In many applications of ad-hoc wireless networks, one often has to broadcast the same message to all nodes. The major goal of any broadcasting algorithm is to minimize the number of retransmissions, i.e., to accomplish the goal with the minimum amount of traffic in the network. In addition to reducing the bandwidth expense needed to convey the message to all the nodes, this objective will try to minimize the total amount of energy spent by the nodes on this communal task. This is of paramount importance in sensor networks, which are often built of disposable nodes, whose life-time is directly determined by the efficiency of their power management scheme. In this paper, we present a heuristic broadcast algorithm dubbed EPDP, for Enhanced Partial Dominant Pruning, and demonstrate its superiority, in terms of the total number of retransmissions, over other solutions addressing the same issue.
On Balanced k-coverage in Visual Sensor Network
Md. Muntakim Sadik,Sakib Md. Bin Malek,Ashikur Rahman
Computer Science , 2015,
Abstract: Given a set of directional visual sensors, the $k$-coverage problem determines the orientation of minimal directional sensors so that each target is covered at least $k$ times. As the problem is NP-complete, a number of heuristics have been devised to tackle the issue. However, the existing heuristics provide imbalance coverage of the targets--some targets are covered $k$ times while others are left totally uncovered or singly covered. The coverage imbalance is more serious in under-provisioned networks where there do not exist enough sensors to cover all the targets $k$ times. Therefore, we address the problem of covering each target at least $k$ times in a balanced way using minimum number of sensors. We study the existing Integer Linear Programming (ILP) formulation for single coverage and extend the idea for $k$-coverage. However, the extension does not balance the coverage of the targets. We further propose Integer Quadratic Programming (IQP) and Integer Non-Linear Programming (INLP) formulations that are capable of addressing the coverage balancing. As the proposed formulations are computationally expensive, we devise a faster Centralized Greedy $k$-Coverage Algorithm (CGkCA) to approximate the formulations. Finally, through rigorous simulation experiments we show the efficacy of the proposed formulations and the CGkCA.
On Reliable Transmission of Data over Simple Wireless Channels
Pawel Gburzynski,Bozena Kaminska,Ashikur Rahman
Journal of Computer Networks and Communications , 2009, DOI: 10.1155/2009/409853
Abstract: Standard protocols for reliable data transmission over unreliable channels are based on various Automatic Repeat reQuest (ARQ) schemes, whereby the sending node receives feedback from the receiver and retransmits the missing data. We discuss this issue in the context of one-way data transmission over simple wireless channels characteristic of many sensing and monitoring applications. Using a specific project as an example, we demonstrate how the constraints of a low-cost embedded wireless system get in the way of a workable solution precluding the use of popular schemes based on windows and periodic acknowledgments. We also propose an efficient solution to the problem and demonstrate its advantage over the traditional protocols.
Improved Self-Pruning for Broadcasting in Ad Hoc Wireless Networks  [PDF]
Raqeebir Rab, Shaheed Ahmed Dewan Sagar, Nazmus Sakib, Ahasanul Haque, Majedul Islam, Ashikur Rahman
Wireless Sensor Network (WSN) , 2017, DOI: 10.4236/wsn.2017.92004
Abstract: Reducing number of forwarding nodes is the main focus of any broadcasting algorithm designed for ad-hoc wireless networks. All reliable broadcasting techniques can be broadly classified under proactive and reactive approaches. In proactive approach, a node selects a subset of its neighbors as forwarding node and announces the forwarding node list in the packet header during broadcast. On the other hand, no such forwarding list is generated in reactive approach. Rather, a node (cognitively) determines by itself whether to forward the packet or not based on neighbor information. Dominant pruning and Self-pruning are two example techniques that fall under proactive and reactive approach respectively. Between the two methods, dominant pruning shows better performance than self-pruning in reducing number of forwarding nodes as they work with extended neighbor knowledge. However, appended forwarding node list increases message overhead and consumes more bandwidth. As a result, the approach becomes non-scalable in large networks. In this paper, we propose a reactive broadcasting technique based on self-pruning. The proposed approach dubbed as “Improved Self-pruning based Broadcasting (ISB)” algorithm completes the broadcast with smaller packet header (i.e., with no overhead) but uses extended neighbor knowledge. Simulation results show that ISB outperforms dominant pruning and self-pruning. Furthermore, as the network gets more spread and denser, ISB works remarkably well.
Contributions of Women’s Participation in the Local Government of Bangladesh  [PDF]
Md. Mizanur Rahman
Sociology Mind (SM) , 2015, DOI: 10.4236/sm.2015.53018
Abstract: Union Parishad (UP) as a unit of rural local government of Bangladesh has a history of 145 years but women’s representation was ensured only 2 decades ago. The paper is based on the argument that within the span of 2 decades, despite encountering huge challenges some women leaders (WLs) might have performed their role with their constrained participation in the UP. Against such a context, the paper is aimed at unraveling the research question: How did WLs perform in the UP amidst their challenges and constrained participation? The paper is based on hermeneutic phenomenological approach which was supported by case study, content analysis and observation methods. The findings of the paper revealed that having ensured their limited participation in the UP some women leaders were able to promote transparency and accountability, establish social justice and provide community services in the rural society.
Aerial Extent Analysis and Environmental Problems Identification of Matasagar and Sukhsagar Wetlands in Bangladesh Using GIS and Remote Sensing Tools  [PDF]
Md. Zakiur Rahman, Md. Shahedur Rashid
Journal of Geographic Information System (JGIS) , 2016, DOI: 10.4236/jgis.2016.86054
Abstract: Bangladesh is a land of wetlands. Basically, most of them are freshwater wetlands and have great influence on the primary economic activities such as agriculture and fisheries of the country. Due to its important role in the harmonizing ecosystem, wetlands demand much attention as a significant part of our environment. Matasagar and Sukhsagar are very important historical wetlands of Bangladesh. But those are endangered today due to lack of public awareness of the dangers of their activities to the environment and unbridled profit making activities of the commercial users of the wetlands. Comparisons of maps and Google images from 1933 to present have shown that the forest areas of the wetlands have been progressively destroyed, and these have greatly affected the biodiversity of these areas mentioned. GIS (Geographic Information System) and remote sensing techniques are used to identify the changes in the aerial extent of those wetlands. This study also tried to explore present environmental conditions by in-situ observation. This is high time; some serious steps should be taken to ensure the conservation and preservation of these areas mentioned.
Evaluation of Anthelmintic Activity of Aqueous Leaf Extract of Clitoria ternatea Linn.
Kamrun Nahar,Muhammad Ashikur Rahman,Most. Nazma Parvin,Shammy Sarwar
Stamford Journal of Pharmaceutical Sciences , 2010,
Abstract: Development of anthelmintic resistance and high cost of conventional anthelmintic drugs led to the evaluation of medicinal plants as an alternative source of anthelmintics. The current study was aimed to evaluate the possible anthelmintic effects of crude fresh juice of leaves of Clitoria ternatea Linn. using of adult earth worm Pheretima Posthuma. Three concentrations (25, 50, 100mg/ml) of juice were studied for the determination of time of paralysis and death of the earth worms. Albendazole in same concentration as that of juice was considered as standard reference and normal saline as control. The result of the present study reveals that fresh juice significantly showed paralysis and also caused death of worms especially at higher concentraton of 100mg/ml, as compared to standard reference Albendazole.
Aggression in Boys and Girls as Related to Their Academic Achievement and Residential Background  [PDF]
Md Shahinoor Rahman, Lailun Nahar
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.45065

The study was conducted to explore aggression in boys and girls as related to their academic achievement and residential background in Bangladesh. Stratified random sampling technique was used and total 80 respondents constituted the sample of the study. They were equally divided into boys and girls. Each group was again equally divided into high and low grade. Each subgroup was again equally divided into urban and rural residential background. Thus the study used a 2 × 2 × 2 factorial design consisting of two levels of gender (boy/girl), two levels of academic achievement (high grade/low grade) and two levels of residential background (urban/rural). The Bengali version of measure of aggressive behavior (Rahman, A. K. M. R., 2003) originally developed by Buss and Perry (1992) was used for the collection of data. It was found that regardless of gender, boys expressed more aggression than girls. Similarly, regardless of academic achievement, students with high academic grade will show more aggressive behavior than low academic grade students. Finally, students of urban areas will not show significantly more aggressive behavior than rural areas students. Thus the differential treatment in gender, academic achievement and residential background provides a new dimension in understanding aggression in rural and urban boys and girls.

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