Energy-Efficient Cooperative Medium Access Control (MAC) Protocol for Wireless Sensor Networks

Mohammad Helal Uddin Ahmed,Choong Seon Hong 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1D

Recent research activities in cooperative communication focus on achieving energy efficiency and reliability. Relay selection strategy for cooperative communication improves the performance significantly. However, due to imbalance consumption of power, network might die earlier and more than 90% energy remains unused. In this paper, we provide a framework of an energy-efficient medium access control protocol that minimizes these problems and improves energy efficiency.

Data Distribution to Vehicular Passengers Through PLC Systems

Mohammad Helal Uddin Ahmed,Choong Seon Hong 한국정보과학회 2013 한국정보과학회 학술발표논문집 Vol.2013 No.6

The Causes of Deforestation and Loss of Genetic Resources in Bangladesh

Mohammad Saiful Islam,Mohammad Jahidul Islam,Sheikh Ali Ahmed,Su Kyoung Chun,Song-Ho Chong,Jong In Kim 한국가구학회 2007 한국가구학회지 Vol.18 No.4

Almost all the people, particularly the rural people are directly dependent on the continued productivity of natural resources, like water, soils, forests and fisheries. But the overuse by the extremely high population pressures has degraded the natural resources into severe widespread deforestation. The degradation of natural resources, particularly the plant resources has been a great concern for socio-economic and sustainable development of the country. The Forests in Bangladesh have been depleted and degraded in volume, area, and quantity, thus requiring urgent forest protection by identifying the causes of forest loss. There are so many causes of deforestation and loss of genetic resources such as; the timber industry, which, legal or not, are cutting too many trees; indigenous forest dwellers, having their own types of problems; migrants, who, because of problems in their places of origin, have decided to move to the forests and the government through its Forest Department which is not able or willing to implement suitable policies to regulate the cutting trees and to prevent illegal cutting. Because it is a time consuming task to mitigate the first and second sets of factors, we recommend involving forest dwellers in forestry practices as much as possible and taking necessary steps to alleviate the third and fourth sets and thereby reduce the rate of forest depletion. Accordingly, a number of strategies that should be adopted to halt the loss of remaining forest cover are discussed.

Improvement in DRX Power Saving for Non-real-time Traffic in LTE

Mohammad Tawhid Kawser,Mohammad Rakibul Islam,Khondoker Ziaul Islam,Mohammad Atiqul Islam,Mohammad Mehadi Hassan,Zobayer Ahmed,Rafid Hasan 한국전자통신연구원 2016 ETRI Journal Vol.38 No.4

A discontinuous reception (DRX) operation is included in the Long Term Evolution (LTE) system to achieve power saving and prolonged battery life of the user equipment. An improvement in DRX power saving usually leads to a potential increase in the packet delay. An optimum DRX configuration depends on the current traffic, which is not easy to estimate accurately, particularly for non-real-time applications. In this paper, we propose a novel way to vary the DRX cycle length, avoiding a continuous estimation of the data traffic when only non-real-time applications are running with no active real-time applications. Because a small delay in non-real-time traffic does not essentially impact the user’s experience adversely, we deliberately allow a limited amount of delay in our proposal to attain a significant improvement in power saving. Our proposal also improves the delay in service resumption after a long period of inactivity. We use a stochastic analysis assuming an M/G/1 queue to validate this improvement.

Proteome Analysis and Morphological Characteristics of Purple Pericarp Rice

Mohammad Mominur Rahman,Mohammad Nurul Matin,Saifullah Ahmed Saief,Sang Gu Kang 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04

Rice with purple colored pericarp deposit anthocyanin on the seed coat and color accumulation increased rapidly during seed development. The purple color of rice pericarp is genetically determined by the Prp locus. Inheritance of purple pericarp was studied in Prp/ Kumgangbyeo (indica type Korean variety). Pericarp color of the F1 plants was purple and the F2 population of 274 plants segregated into 3 purple: 1 white ratio indicating dominant nature of the purple color. Comparative proteomic approaches using 2-DE were applied to analyze the protein profiles and molecular mechanism of purple color formation in ricepericarp. Results revealed that approximately 1,500protein spots were reproducibly detected in the gels with silver staining across the two biological replicates. Among them, 46 proteins were expressed differentially between purple color pericarp rice and white color pericarp of the wild type rice, in which 28 and 16 protein spots were more than two fold up regulated in the wild type and purple pericarp, respectively. MALDI-TOF MS analysis of nine spots revealed that putative fructokinase,embryo-specific protein and one unknown proteins were abundant in the wild type, whereas, anthocyanidin synthase, putative chloroplast inner envelope protein, and dihydroflavonol reductase were highly abundant in the Prp rice. Results indicated anthocyanidin synthase and/or dihydroflavonol reductase might be involved in the biosynthetic pathway of the purple color formation in the rice pericarp. [This research was supported by the Grant funded by Agricultural R&D Promotion Center, ARPC (IPET project number: 108091-05-1-CG000)].

Effective Diagnosis and Monitoring of Heart Disease

Ahmed Fawzi Otoom,Emad E. Abdallah,Yousef Kilani,Ahmed Kefaye,Mohammad Ashour 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.1

Wearable sensor mobile technologies and machine learning techniques are considered as two of the key research areas in the computer science and healthcare application industries. Our main aim is to build a simple yet accurate mobile application that is capable of real-time diagnosis and monitoring of patients with Coronary Artery Disease (CAD) or heart disease which is a major cause of death worldwide. Most available mobile healthcare systems focus on the data acquisition and monitoring component with little attention paid to real-time diagnosis. In this work, we build an intelligent classifier that is capable of predicting a heart disease problem based on clinical data entered by the user or the doctor and by using machine learning algorithms. This diagnosis component is integrated in the mobile application with a real-time monitoring component that continuously monitors the patient and raises an alarm whenever an emergency occurs. Our results show that the proposed diagnosis component has proved successful with a classification performance accuracy of more than 85% with the cross-validation test. Moreover, the monitoring algorithm provided a 100% detection rate.

Outdoor Applications of Hyperspectral Imaging Technology for Monitoring Agricultural Crops: A Review

Ahmed, Mohammad Raju,Yasmin, Jannat,Mo, Changyeun,Lee, Hoonsoo,Kim, Moon S.,Hong, Soon-Jung,Cho, Byoung-Kwan Korean Society for Agricultural Machinery 2016 바이오시스템공학 Vol.41 No.4

Background: Although hyperspectral imaging was originally introduced for military, remote sensing, and astrophysics applications, the use of analytical hyperspectral imaging techniques has been expanded to include monitoring of agricultural crops and commodities due to the broad range and highly specific and sensitive spectral information that can be acquired. Combining hyperspectral imaging with remote sensing expands the range of targets that can be analyzed. Results: Hyperspectral imaging technology can rapidly provide data suitable for monitoring a wide range of plant conditions such as plant stress, nitrogen status, infections, maturity index, and weed discrimination very rapidly, and its use in remote sensing allows for fast spatial coverage. Conclusions: This paper reviews current research on and potential applications of hyperspectral imaging and remote sensing for outdoor field monitoring of agricultural crops. The instrumentation and the fundamental concepts and approaches of hyperspectral imaging and remote sensing for agriculture are presented, along with more recent developments in agricultural monitoring applications. Also discussed are the challenges and limitations of outdoor applications of hyperspectral imaging technology such as illumination conditions and variations due to leaf and plant orientation.

Energy efficient smart-relay-based cooperative MAC for wireless networks

Ahmed, Mohammad Helal Uddin,Hong, Choong Seon,Lee, Sungwon Springer-Verlag 2014 Computing Vol.96 No.2

Amide-functionalized graphene with 1,4-diaminobutane as efficient metal-free and porous electrocatalyst for oxygen reduction

Ahmed, Mohammad Shamsuddin,Kim, Young-Bae Elsevier 2017 Carbon Vol.111 No.-

<P>A porous graphene catalyst was prepared with 1,4-diaminobutane (DAB) through amide functionalization and was used as a metal-free electrocatalyst for oxygen reduction reaction (ORR) in alkaline fuel cells. DAB was used as a junction among functionalized graphene layers to impart electrocatalytic activity for the ORR resultant from the interlayer charge transfer. The successful amidation and subsequent reduction in the process of catalyst preparation were confirmed using X-ray photoelectron spectroscopy. A hierarchical porous structure was also confirmed through the surface morphological analysis. The Brunauer-Emmett-Teller specific surface area and thermal stability increased by 2.6- and 1.5-fold, respectively, after successful amide functionalization. The as-prepared catalyst was proved an efficient metal-free electrocatalyst with better electrocatalytic activity, stability, and tolerance to the crossover effect than commercially available Pt/C for ORR by a direct four-electron involved pathway. These results indicate that the amide-functionalized graphene metal-free catalyst reported in this study is a promising alternative to traditional noble metal-based ORR catalysts. (C) 2016 Elsevier Ltd. All rights reserved.</P>

Smart Grid Cooperative Communication with Smart Relay

Mohammad Helal Uddin Ahmed,Md. Golam Rabiul Alam,Rossi Kamal,홍충선,이성원 한국통신학회 2012 Journal of communications and networks Vol.14 No.6

Many studies have investigated the smart grid architecture and communication models in the past few years. However,the communication model and architecture for a smart grid still remain unclear. Today’s electric power distribution is very complex and maladapted because of the lack of efficient and costeffective energy generation, distribution, and consumption management systems. A wireless smart grid communication system can play an important role in achieving these goals. In this paper, we describe a smart grid communication architecture in which we merge customers and distributors into a single domain. In the proposed architecture, all the home area networks, neighborhood area networks,and local electrical equipment form a local wireless mesh network (LWMN). Each device or meter can act as a source, router,or relay. The data generated in any node (device/meter) reaches the data collector via other nodes. The data collector transmits this data via the access point of a wide area network (WAN). Finally,data is transferred to the service provider or to the control center of the smart grid. We propose a wireless cooperative communication model for the LWMN.We deploy a limited number of smart relays to improve the performance of the network. A novel relay selection mechanism is also proposed to reduce the relay selection overhead. Simulation results show that our cooperative smart grid (coopSG)communication model improves the end-to-end packet delivery latency,throughput, and energy efficiency over both the Wang et al. and Niyato et al. models.