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RISS 인기검색어
- 검색키워드
- 저자 : ( M. Mohiuddin ) (검색결과 15 건)
- 무료
- 기관 내 무료
- 유료
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Mohiuddin, M.,Sexton, J.,Missous, M. The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.5
This paper investigates the two dominant but intertwined current blocking mechanisms of Switching and Kirk Effect in pure ternary InAlAs/InGaAs/InAlAs Double Heterojunction Bipolar Transistors (DHBTs). Molecular Beam Epitaxy (MBE) grown, lattice-matched samples have been investigated giving substantial experimental results and theoretical reasoning to explain the interplay between these two effects as the current density is increased up to and beyond the theoretical Kirk Effect limit for devices of emitter areas varying from $20{\times}20{\mu}m^2$ to $1{\times}5{\mu}m^2$. Pure ternary InAlAs/InGaAs/InAlAs DHBTs are ideally suited for such investigations because, unless corrective measures are taken, these devices suffer from appreciable current blocking effect due to their large conduction band discontinuity of 0.5 eV and thus facilitating the observation of the two different physical phenomena. This enhanced understanding of the interplay between the Kirk and Switching effect makes the DHBT device design and optimization process more effective and efficient.
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M. Mohiuddin,J. Sexton,M. Missous 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.5
This paper investigates the two dominant but intertwined current blocking mechanisms of Switching and Kirk Effect in pure ternary InAlAs/InGaAs/InAlAs Double Heterojunction Bipolar Transistors (DHBTs). Molecular Beam Epitaxy (MBE) grown, lattice-matched samples have been investigated giving substantial experimental results and theoretical reasoning to explain the interplay between these two effects as the current density is increased up to and beyond the theoretical Kirk Effect limit for devices of emitter areas varying from 20x20 μm² to 1x5 μm². Pure ternary InAlAs/InGaAs/InAlAs DHBTs are ideally suited for such investigations because, unless corrective measures are taken, these devices suffer from appreciable current blocking effect due to their large conduction band discontinuity of 0.5 eV and thus facilitating the observation of the two different physical phenomena. This enhanced understanding of the interplay between the Kirk and Switching effect makes the DHBT device design and optimization process more effective and efficient.
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Abdullah, M.,Young, J.W.,Tyler, H.D.,Mohiuddin, G. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.4
Fifty mid-lactation Holstein cows were used in a six-week feeding trial to study effects of high-forage, high-fat diets on dry matter intake and production performance. Cows were divided into 10 replicates, each consisting of five cows. Each cow was assigned to a control (diet 1) or one of the four experimental diets (high-forage (75%), high-fat (7.5%) (diet 2); high-forage, medium-fat (5%) (diet 3); medium forage (65%), high-fat (diet 4); medium-forage, medium-fat (diet 5)), or a control diet containing about 50% forage and 2% fat. All diets were isonitrogenous (17.7% crude protein). The forage mixture consisted of 20% alfalfa hay, 40% alfalfa haylage, and 40% com silage. Supplemental fat included 80% rumen-protected fat and 20% yellow grease. Dry matter intake was decreased (p<0.01) in cows fed experimental diets (18.4, 20.9, 19.9, and 22.6 kg for cows fed diets 1-4, respectively vs. 27.5 kg for cows fed the control diet). Daily milk production was lower (p<0.05) for cows consuming experimental diets (30.5, 31.3, 31.0, and 32.5 kg for cows fed greater for cows consuming experimental diets (1.74, 1.55, 1.60, and 1.53 kg milk/kg dry matter intake for cows fed diets 1-4, respectively, vs. 1.26 kg milk/kg dry matter intake for cows fed the control diet).
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Abdullah, M.,Young, J.W.,Tyler, H.D.,Mohiuddin, G. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.4
Fifty mid-lactation Holstein cows were used in a six-week feeding trial to study effects of high-forage, and high-fat diets on blood constituents, rumen fermentation and dry matter digestibility. Cows were divided into 10 replicates, each consisting of five cows. Each cow was assigned to a control (diet 1) or one of the four experimental diets (high-forage (75%), high-fat (7.5%) (diet 2); high-forage. medium-fat (5.0%) (diet 3); medium forage (65%), high-fat (diet 4); medium-forage, medium-fat (diet 5)), or a control diet containing about 50% forage and 2% fat. All diets were isonitrogenous (17.7% crude protein). The forage mixture consisted of 20% alfalfa hay, 40% alfalfa haylage, and 40% corn silage. Supplemental fat included 80% rumen-protected fat and 20% yellow grease. A non-significant difference was observed in concentrations of blood glucose for cows on different experimental and control diets. Plasma nonesterified fatty acids (NEFA) were higher in cows consuming experimental diets than those consuming the control diet. However, differences in NEFA concentrations in the plasma of cows consuming diets with different forage and fat levels were not significant. Rumen pH, concentration of volatile fatty acids (VFA) in rumen contents, and dry matter digestibility of control and experimental diets, and diets with different levels of forage and supplemental fat did not differ significantly.
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PERFORMANCE MEASUREMENTS OF A TRACKED VEHICLE SYSTEM
A. RAHMAN,A. K. M. MOHIUDDIN,A. HOSSAIN 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.4
To improve crossing ability, the most important performance factor for tracked vehicle systems operating on low-bearing capacity peats, and to minimize income losses that result from downtime and maintenance costs, a vehicle was designed in order to adapt to operating condition changes. This article describes the mobile performance of a novel vehicle with segmented rubber tracks on a low-bearing capacity peat. At an equivalent travelling speed, the novel vehicle’s tractive performance in a variable operating environment caused by changes in terrain cohesiveness and hydrodynamic responses was superior to that of the previous model. The new vehicle, which could be operated on the Sepang peat, showed a tractive effort of 42.2% of the gross vehicle weight in field experiments; the recommended minimum tractive effort is between 30 and 36% of the gross vehicle weight.
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Cushion pressure control system for an intelligent air-cushion track vehicle
Altab Hossain,Ataur Rahman,A.K.M. Mohiuddin 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.4
This paper presents the control system of cushion pressure for the developed intelligent air-cushion track vehicle (IACTV) for operating on swamp terrain and wet fields. A novel auto-adjusting supporting system is designed for the vehicle’s intelligent air-cushion system. Focusing on minimizing the total power demand of the vehicle, an optimization model has been established, for examining the effects of vehicle parameters and load distribution on power consumption by controlling air-cushion pressure. Then optimum cushion pressure is determined based on the developed optimum pressure – sinkage relationship and the pressure in the cushion chamber is controlled by the Fuzzy controller by maintaining volume flow rate and continuously monitored by the pressure sensor attached with the cushion chamber. The ultrasonic displacement sensor is used to measure the sinkage of the vehicle. The output voltages of the ultrasonic displacement are used to operate the pull-in solenoid switch through the microcontroller which closes the circuit of the compressor motor. Distribution of vehicle load to the air-cushion system is controlled by Fuzzy Logic controller by maintaining the inside pressure of the cushion.
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FUZZY EXPERT SYSTEM FOR CONTROLLING SWAMP TERRAIN INTELLIGENT AIR-CUSHION TRACKED VEHICLE
A. HOSSAIN,A. RAHMAN,A. K. M. MOHIUDDIN 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.5
A fuzzy expert system was used in this study to control an intelligent air-cushion tracked vehicle (IACTV) as it operated in a swamp peat terrain. The system was effective in controlling the intelligent air–cushion vehicle while measuring the vehicle traction (TE), motion resistance (MR), power consumption (PC), cushion clearance height (CCH) and cushion pressure (CP). An ultrasonic displacement sensor, pull-in solenoid electromagnetic switch, pressure-control sensor,microcontroller, and battery pH sensor were incorporated into the fuzzy expert system (FES) to experimentally determine the TE, MR, PC, CCH, and CP. In this study, we provide an illustration of how an FES might play an important role in the prediction of the power consumption of the vehicle’s intelligent air-cushion system. The mean relative error in the actual and predicted values from the FES model with respect to tractive effort, total motion resistance and total power consumption were found to be 5.58 %, 6.78 % and 10.63 %, respectively. For all parameters, the relative error in the predicted values was found to be less than the acceptable limit (10%), except for the total power consumption. Furthermore, the goodness of fit of the predicted values was found to be close to 1.0 as expected and, hence, indicates the good performance of the developed system.
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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.
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