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( Muhammad Sazzad Hossain Siddiqui ),( Bertram A Jenkins ),( Emtiaz Ahmed ) 서울대학교 통일평화연구원 2023 Asian Journal of Peacebuilding Vol.11 No.2
The survey for practical consideration is crucial in social and policy science inquiries. Several systematic reviews in the post-conflict peacebuilding literature have thus far ignored its efficaciousness. This knowledge gap motivated in developing Conflict- Affected Population Survey technique to survey the conflict-ravaged Chittagong Hill Tracts indigenous peoples for the purpose of examining peace hybridity in Bangladesh, as the quantitative part of the study. This article outlines guidelines for designing probabilistic sampling and survey procedures for a robust sequential explanatory mixed-methods case study research in a terrain where an accurate sample frame is difficult to define. The systematic methodological strategy adopted herein enabled the compilation of a comprehensive cross-sectional case study where findings are generalizable, especially the concept and model central to our thesis on indigeneity dilution.
Stereoscopic Video Transmission Over DVB-T2 System Using Future Extension Frame
Hossen, Md. Sazzad,Kim, Sung-Hoon,Kim, Ki-Doo IEEE 2016 IEEE transactions on broadcasting Vol.62 No.4
<P>This paper proposes a complete framework for end-to-end transmission of stereo video for regular services using a digital video broadcasting-terrestrial version 2 (DVB-T2) system. The proposed system incorporates existing services (such as fixed and mobile) to deliver stereoscopic 3-D content in order to maintain backward compatibility without requiring any additional bandwidth. The system is based on a single stream using the future extension frame part of the T2 frame in the DVB-T2 system, which provides the flexibility to carry both (T2-base and T2-lite) profiles of DVB-T2 on a single stream. T2-base and T2-lite are used for left-and right-eye views of stereoscopic video. Finally, a service scenario for the proposed system considering target receivers and the required data rate is analyzed. A case study is given to represent practical applications of the proposed system in scenarios that could be deployed at different times in the mid-term future in high-definition environment.</P>
Hossain Md. Sazzad,Oluwajuwon Tomiwa V.,Ludgen Afentina N.,Hasert David P.,Sitanggang Marisa,Offiah Chinedu 한국산림과학회 2023 Forest Science And Technology Vol.19 No.4
The forests in Central Kalimantan, Indonesia have been heavily impacted by logging, mining, fires, and other degradation activities for over 30 years. To address this, the Indonesian gov- ernment has promoted community-based forest management schemes. One such scheme, called Hutan Kemasyarakatan (HKm), has introduced Sengon (Paraserianthes falcataria) in smallholder plantations in Rungan Barat, Gunung Mas, Central Kalimantan. However, accur- ate estimation of biomass is crucial for carbon sequestration credits, but there are no specific allometric models for estimating Sengon above-ground biomass (AGB) in this area. To create a site-specific AGB allometric model for Sengon, 23 trees were felled to collect fresh biomass data. Various tree variables, such as diameter at breast height: 1.3 m (DBH), total height, mer- chantable height, and stem bole volume were measured for each sample tree. The average wood basic density of Sengon at the study site was also calculated. A total of nine alterna- tive candidate regression equations were fitted and tested to select the best-fit AGB allomet- ric model. Also, to assess the adaptedness of the identified AGB allometric model, comparisons with the models from literature, and comparisons between two interchange- able methodologies (i.e. direct biomass allometric model and biomass expansion factor (BEF)-based biomass estimation) were undertaken. This study has developed a regression function, denoted as Y ¼ 0:08062 �DBH2:36816 , to estimate the AGB of Sengon trees in smallholder plantations in Central Kalimantan, Indonesia. The formulated regression function demonstrated better estimation performance compared to common pantropical and regional AGB allometric models. In terms of the BEF-biomass approach, the AGB estimation derived from Smalian’s volume was relatively accurate, close to the mean AGB obtained by the formulated model in this study. In summary, this study proposes using the developed model, based solely on DBH, to accurately estimate AGB and carbon sequestration potential in Sengon trees. The accurate estimation of AGB using this model has additional advantages, including facilitating carbon credit acquisition and informing long-term management decisions.
Energy efficient electromagnetic actuated CVT system
Ataur Rahman,Sazzad Bin Sharif,A.K.M. Mohiuddin,Mahbubur Rashid,Altab Hossain 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
A continuously variable transmission (CVT) system transmits the engine/battery power to the car driving wheel smoothly and efficiently. Several types of CVT already been developed to improve the transmission losses while maintaining acceleration time. However,most of the CVT has some constraints in the actuation mechanism which led us to develop an innovative electromagnetic actuator forCVT. Simplified mathematical equations have been developed for the kinematics analysis of clamping forces of the CVT and electromagneticforces of EMA. The EMA has been developed for ¼ scale car with two sets of solenoid. Each of the two sets has been equippedwith primary and secondary pulleys for pushing and pulling the movable sheave. The solenoid is operated by controlling the supply currentwith a fuzzy logic controller. A simulation based fuzzy logic controller has been introduced here for identifying the desired current ofthe EMA actuation. The experimental results show that the EMA develops electromagnetic forces 301 N for the supply current of 3.37amp, which makes the acceleration time of the car in the range of 2.5~3.5 sec and electromagnetic actuated CVT system highly energyefficient.
Kinematics and nonlinear control of an electromagnetic actuated CVT system for passenger vehicle
Ataur Rahman,Sazzad Bin Sharif,Altab Hossain,A. K. M. Mohiuddin,A. H. M. Zahirul Alam 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.7
An electromagnetic actuated continuously variable transmission (EMA-CVT) system is developed by two sets of electromagnetic actuators (solenoid) located on primary and secondary pulley. A set of solenoids are attached to the primary and secondary pulley to develop the attraction and repulsive forces. The relationships between the speed ratio and electromagnetic actuation and clamping force and output torque of the CVT are established based on the kinematics of the EMA-CVT system. A fuzzy logic controller (FLC) is developed to control the EMA precisely based on the feedback of the RPM sensor and slope sensor. The EMA-CVT performance with controller has found 28% more than the performance of the EMA-CVT without controller. The solenoids of the EMA were activated by varying the current supply with the Fuzzy-Proportional-Derivative-Integrator (FPID) to maintain the non-linearity of the CVT in response of the vehicle traction torque demand. Result shows that the solenoid is able to pull the plunger in the desired distance with supply current of 12.5 amp while push the plunger to the desired distance with 14.00 amp current supply to the windings when the vehicle is considered in 10% grade. The acceleration time of the ¼ scale car has been recorded as 5.5 s with the response of drive wheels torque.