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Search Results: 1 - 10 of 6246 matches for " MD. Osman Gani "
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Prediction of State of Wireless Network Using Markov and Hidden Markov Model
MD. Osman Gani,Hasan Sarwar,Chowdhury Mofizur Rahman
Journal of Networks , 2009, DOI: 10.4304/jnw.4.10.976-984
Abstract: Optimal resource allocation and higher quality of service is a much needed requirement in case of wireless networks. In order to improve the above factors, intelligent prediction of network behavior plays a very important role. Markov Model (MM) and Hidden Markov Model (HMM) are proven prediction techniques used in many fields. In this paper, we have used Markov and Hidden Markov prediction tools to predict the number of wireless devices that are connected to a specific Access Point (AP) at a specific instant of time. Prediction has been performed in two stages. In the first stage, we have found state sequence of wireless access points (AP) in a wireless network by observing the traffic load sequence in time. It is found that a particular choice of data may lead to 91% accuracy in predicting the real scenario. In the second stage, we have used Markov Model to find out the future state sequence of the previously found sequence from first stage. The prediction of next state of an AP performed by Markov Tool shows 88.71% accuracy. It is found that Markov Model can predict with an accuracy of 95.55% if initial transition matrix is calculated directly. We have also shown that O(1) Markov Model gives slightly better accuracy in prediction compared to O(2) MM for predicting far future.
Study on the Quality of Gardella Fine Yarn in Comparison to Modified Ring Spinning Frame Fine Yarn
A.K.M. Mahabubuzzaman,Latifa Binte Lutfar,Md. Asaduzzaman,Md. Osman Gani Miazi
Pakistan Journal of Biological Sciences , 2003,
Abstract: The spin Guard Gardella is a centrifugal type dry spinning machine. In this machine yarn can be spun from 72 (2.08 lbs./spy) to 241 tex (7 lbs./spy). But in this system of this machine, it is preferable to produce fine yarn. Here fine yarn 103 tex (3 lbs./spy) was produced in existing speed. Apron Draft Spinning frame was modified into ring spinning system. In this system rings and travelers were used and fine yarn upto 103 tex (3 lbs./spy) was produced. Bangla white B (BWB) grade jute fibres were used for producing fine yarn. The spinning performance and physical properties of produced yarn were found and compared. It was found that the yarn produced from Gardella spinning frame was better than modified ring spinning frame.
Usage of Human Resource Information System and Its Application in Business: A Study on Banking Industry in Bangladesh  [PDF]
Faruk Bhuiyan, Mohammad Osman Gani
iBusiness (IB) , 2015, DOI: 10.4236/ib.2015.73013
Abstract: The study aimed at examining the perceived importance of human resource information system (HRIS) in business. A structured questionnaire was used to get an opinion from human resource end-users from the 55 scheduled banks consisted of 8427 branches. A total of 1200 responses were returned as the complete form. The study then extracted the perceived important reasons of using HRIS in business through principal component (PCA) analysis. In addition, one-way analysis of variance (ANOVA) was tested to examine the variance levels among the responses. The results of the existing study revealed that HRIS only automates the repetitive HR functions but also facilitates HR end-users in allocating workforces effectively, promoting suitable corporate culture, designing employees’ career plan and improving services to the employees. Further, it found no significant variances among HR end-users’ responses on the perceived importance of HRIS according to their demographic variables. Albeit many studies had been conducted on the importance of HRIS, there was hardly any study that had gone through factor analysis. However, this study provided broad evidence to enrich the existing literature in the respective field, with improved methodological and measurement issues including factor analysis over the previous studies, to unleash the importance of HRIS in business.
Are fish oil omega-3 long-chain fatty acids and their derivatives peroxisome proliferator-activated receptor agonists?
Osman ABSM Gani
Cardiovascular Diabetology , 2008, DOI: 10.1186/1475-2840-7-6
Abstract: Docosahexaenoic acid and eicosapentaenoic acid, which are the fatty acids abundant in fish oil, are traditionally used against metabolic diseases. These fatty acids act as PPAR agonists that transcript the genes involved in glucose and lipid homeostasis. Present hypothesis suggests that the derivatives of these fatty acids are stronger PPAR agonists than the parent compounds. X-ray structures of PPARs indicate that α or β derivatives of fatty acids would fit into PPARα/γ binding cavity. Therefore, the derivatives will exhibit stronger affinities and activities than the parent compounds.Ligand binding assays and gene transactivation assays should be performed to test the hypothesis. Fluorescence-based methods are advantageous in binding assays, because they were found more suitable for fatty acid binding assays. In transactivation assays, care should be taken to remove contaminants from recombinant proteins.Present hypothesis is framed on the basis of molecular structure of natural PPAR agonists. Small structural changes in the molecular structure of fatty acids have a great influence on activating different PPARs. Therefore, this hypothesis bridges the concept of natural PPAR agonists and the use of structural information in designing new drugs against diabetes and metabolic syndrome. The derivatives may also be used as anti-inflammatory and anticancer agents.Peroxisome proliferator-activated receptors (PPARs) are members of nuclear receptor superfamily. Three isotypes of PPARs (PPARα, PPARγ, and PPARδ) have distinct tissue distributions, distinct physiological roles, and distinct ligand specificities [1]. Activation of PPARα lowers lipid levels, PPARγ increases insulin sensitivity, and PPARδ regulates cholesterol and glucose levels [1-3]. PPAR ligands comprise natural or synthetic compounds, including fatty acids and eicosanoids [4,5]. As synthetic compounds, fibrates are known as PPARα agonists and glitazones act as PPARγ agonists [2] (Fig. 1). PPARα/γ dual agonis
Morphological, Physical and Chemical Characteristics of Hill Forest Soils at Chittagong University, Bangladesh  [PDF]
Md. Akhtaruzzaman, Md. Enamul Haque, Khan Towhid Osman
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.41004

Forty five soil samples were collected from the four pedons of the hill areas at Chittagong University based on the depth of soil horizon. Soil profiles on hill top were relatively well developed and belonged to Ultisols according to USDA soil Taxonomy. The profiles at the piedmont were relatively young soils and classified as Inceptisols and Entisols. The soils of all profiles were characterized by coarse texture (38% to 73%, sand fraction), high bulk density (1.15 to 1.32 Mg·m-3), low organic-C content (0.26% to 1.73%), acid soil reaction ( varied from 4.44 to 5.52 and pHKCl from 3.57 to 4.90). Soils in all pedons were poor in exchangeable bases and base saturation. The CEC values ranged from 9.12 cmolc·kg-1 to 14.5 cmolc·kg-1 while ECEC varied from 1.96 to 4.78 cmolc·kg-1. The exchangeable Al (aluminum) concentration ranged from 0.41 to 0.66 cmolc·kg-1. Exchangeable acidity level ranged from 0.74 to 1.25 cmolc·kg-1. Exchangeable Al and aluminum saturation increased with depth and their concentrations were below the toxic range for tree stands. The study revealed that more young soils formed on the piedmont sites had somewhat better properties as compared to matured hill top soils. The variation in physico-chemical properties of the soils seemed to be influenced by the topography to a greater extent in the studied area.

Phytoextraction Efficiency of Lead by Arum (Colocasia esculenta L.) Grown in Hydroponics  [PDF]
Md. Shoffikul Islam, Md. Abul Kashem, Khan Towhid Osman
Open Journal of Soil Science (OJSS) , 2016, DOI: 10.4236/ojss.2016.67012
Abstract: Lead (Pb) tolerance and phytoextraction efficiency of arum (Pani Kachu; Colocasia esculenta L.) were investigated in hydroponics. Plants were grown for 60 days in nutrient solution after addition of Pb at the levels of 0, 50, 200 and 400 μM. The growth of different parts of arum was unaffected at low level of Pb concentration (50 μM Pb) compared with control treatment whereas it decreased gradually with the increase of metal concentration in nutrient solution. Concentration of metal in all parts of arum increased significantly with the levels of Pb in the growth media (p < 0.05). In arum shoots, Pb concentration was 1121 mg·kg-1, at its low level in solution. This concentration (50 μM Pb) did not cause any growth retardation which indicated that arum was a Pb hyperaccumulator plant. On an average, translocation of Pb from roots to shoots was 68% of total Pb which indicated that the major portion of Pb was translocated from roots to shoots. Transfer factor (TF) greater than one for this metal as found in the present experiment confirmed the hyperaccumulation characteristics of arum. Lead uptake in the shoots of arum without growth retardation and TF of Pb in arum indicated that this plant was a suitable candidate for the phytoremediation of soil and water contaminated with Pb.
Comparative Effect of City Finished Compost and NPK Fertilizer on Growth and Availability of Phosphorus to Radish (Raphanus sativus L.)  [PDF]
Ashoka Sarker, Md. Abul Kashem, Khan Towhid Osman
Open Journal of Soil Science (OJSS) , 2012, DOI: 10.4236/ojss.2012.22020
Abstract: A pot experiment was carried out to investigate the comparative effect of city finished compost and NPK fertilizer on the growth and availability of phosphorus to radish (Raphanus sativus L.). An air dried sandy loam soil was mixed with five rates of city finished compost (CFC) equivalent to 0, 5, 10, 20, 40 ton ha–1 and three rates of NPK fertilizer equivalent to 50% (N-P-K = 69-16-35 kg ha–1), 100% (N-P-K = 137-32-70 kg ha–1 K) and 150% (N-P-K = 206-48-105 kg ha–1). Four plants were harvested at 45 days of growth and remaining one plant was harvested at 90 days of growth and separated into leaves and bulbs. After harvest, soil samples were collected from each pot to measure soil pH and available P extracted by Olsen, Mehlich-3, Kelowna and Bray & Kurtz-1 extractants. The growth parameters (length of leaves and bulbs, fresh and dry weight of leaves and bulbs), relative dry matter yield, plant P concentrations, P uptake by radish, soil pH, and available P increased by the rates of CFC and NPK fertilizer treatments. Among the treatments, growth performance of radish was better with the highest rate of 40 t ha–1 CFC treatments. The results obtained from the 5 and 10 t ha–1 CFC treatment were comparable with the results of 50% and 100% NPK fertilizer treatments respectively. Similar effects of amendments were obtained in the case of plant P concentration, uptake of P by plant, soil pH and available soil P concentration. Available P and soil pH showed very strong and positive correlation (P < 0.001) with dry matter yield, P uptake by plant. The P extracted by various extractants also showed strong positive correlation (r = 0.973 to 0.994; P < 0.001 ) each other indicating the suitability of any of the extractants to predict available P. Results of the present study indicated that 10 t ha–1 city finished compost could be used instead of 100% to obtain similar yield and to improve soil conditions.
Recovery of Soil Test Phosphorus from an Acidic Soil Amended with Organic and Inorganic Phosphorus  [PDF]
Farzana Rumi, Md. Abul Kashem, Khan Towhid Osman
Open Journal of Soil Science (OJSS) , 2012, DOI: 10.4236/ojss.2012.24045

Information on soil test phosphorus (P) in soil treated with organic amendments is important to a sound management of manure additions to agricultural fields. This study compared the recovery of cow manure, chicken manure, city compost P relative to triple super phosphate P (TSP) for an acidic soil with different antecedent soil test P (STP). Phosphorus was added at rates of 0, 100, 200, 400 and 800 mg P kg-1 soil based on total P. The soil was incubated at field capacity for 1, 4, 8 and 16 weeks (wk) after which they were extracted using NaHCO3 (Olsen) Mehlich-3, Kelowna and Bray & Kurtz-1 extractants. Regardless of extractants, after 1 wk incubation, the highest STP source was the TSP and the least was the city compost. Soil Test P increased with the addition of amendments from different P sources. Among the amendments, soil test P in TSP amended soil gradually decreased but in the city compost amended soil slightly in- creased with incubation time, whereas the changes of soil test P with time in the cow and chicken manures amended soil was very negligible. Across the amendments and rates of P additions, the value of extractable P with Olsen was of 55 mg  kg-1 (16%), with Mehlich-3 was of 112 mg  kg-1 (32%), with Kelowna was of 88 mg  kg-1 (24%) and with Bray & Kurtz was of 104 mg  kg-1 (29% of total added P). The P extraction efficiency was in the order: NaHCO3 < Kelowna < Bray & Kurtz-1 < Mehlich-3. This study indicates that P in organic amendments reflects plant available P through the entire incubation period but P in the TSP are likely to under estimate after 8 wk of incubation.

Influence of Lime and Phosphorus on Growth Performance and Nutrient Uptake by Indian Spinach (Basella alba L.) Grown in Soil  [PDF]
Ashoka Sarker, Md. Abul Kashem, Khan Towhid Osman
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.43013

A pot experiment was carried out to determine the effect of lime and phosphorus on the growth and nutrient uptake by Indian spinach (Basella alba L.) on an acidic soil. The experimental soil was amended with four levels of lime (0, 500, 1000 and 2000 kg CaCO3 ha-1) and phosphorus (P) (0, 50, 100, and150 kgP ha-1) and their combinations. The results showed that lime and P applied separately or in combination had significant (P < 0.001) effects on growth parameters (height and number of leaves), fresh and dry weight of shoot and root and N, K and Ca uptake by Indian spinach. Combined application of lime and P gave a better result than the separate application of lime and P. Application of 2000 kg·ha-1 lime plus 150 kg P ha-1 had higher uptake of N, K and Ca and better morphological characters that eventually resulted in greater yield compared with other treatments. The results revealed that lime and phosphorus could be used in combination to improve growth performance and nutrient uptake when plants grown in an acidic soil.

Phosphorus Availability, Uptake and Dry Matter Yield of Indian Spinach (Basella alba L.) to Lime and Phosphorus Fertilization in an Acidic Soil  [PDF]
Ashoka Sarker, Md. Abul Kashem, Khan Towhid Osman
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.41006
Abstract: A pot experiment was carried out to investigate the yield of Indian spinach (Basella alba L.) and their uptake and availability of phosphorus from lime and phosphorus amended acidic soil. Four rates of lime (L) equivalent to 0, 500, 1000 and 2000 kg CaCO3 ha-1 and four rates of phosphorus (P) equivalent to 0, 50, 100, and 150 kg·P·ha-1 of TSP were applied in combinations as treatments. Dry matter yield, P concentrations in shoot and root and P uptake by Indian spinach were determined after harvesting 10 weeks old plant and soil samples were collected from each pot to measure available P by Olsen method. Both L and P and their combinations had significant (P < 0.001) effects on shoot and root biomass, shoot and root P concentrations, P uptake by Indian spinach and P availability. Although lime and P increased biomass production, P concentrations of shoot and root, and its uptake by Indian spinach and available P, this effect was boosted by combining L with P applied. 1000 kg lime plus 100 kg P were adequate for plant growth. Available P was strongly and positively correlated (R2 = 0.909, P = 0.000) with P uptake by plant. Results of the present study indicated that lime and phosphorus could be used in combination to enhance plant growth.
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