Chittagong University of Engineering & Technology

About: Chittagong University of Engineering & Technology is a education organization based out in Chittagong, Bangladesh. It is known for research contribution in the topics: Renewable energy & Dielectric. The organization has 1200 authors who have published 1444 publications receiving 10418 citations. The organization is also known as: Engineering College, Chittagong & Bangladesh Institute of Technology, Chittagong.

Model Predictive Control of a Three Phase Four Leg LC Filtered Inverter: Reduction of Manufacturing Cost and Simplification of Working Processes

Abstract: A four-leg inverter is generally used to give power to three-phase loads at various conditions like balanced, unbalanced, light loads, heavy loads, etc., and also under the condition of source. Again a four-leg inverter gives three independent voltages with an extra neutral leg. An LC filter is used to make the output more precise and accurate for making the inverter compatible to connect with the grid system. Normally a traditional LC filtered inverter using finite set model predictive control needs both inductor current and capacitor voltage measurement. That makes the inverter bulkier and rises the manufacturing cost. So, in this paper, we have formulated a sensor-less technique for the four-leg LC filtered inverter with a resistive load only which eliminates the current sensors of the system and thus reduces the manufacturing cost of the inverter and simplifies its working process.

Mechanical, optical and high-temperature magnetic properties of Sn-substituted Mg–Zn ferrites

Abstract: Sn-substituted Mg–Zn ferrites (0 ≤ x ≤ 0.10) have been synthesized using conventional ceramic technique and the mechanical, optical and high-temperature magnetic properties were studied. The formal...

Speed up the conversion rate of integrator type Analog-to-Digital (A/D) converter combining it with flash type converter

Abstract: In this paper, flash type A/D converter is combined with integrator type A/D converter and this result a significant increase in conversion speed of integrator type A/D converter. Eight additional comparators are used with integrator type A/D converter to make flash architecture and this makes the integrator type converter 8 times speedy than before. The circuit is simulated in PSIM simulator and the result is verified.

Analytical model for bond–slip behavior of the anchorage of deformed bars in reinforced concrete members subjected to bending

Abstract: The distribution of bond stresses along the anchorage of a reinforcing bar in concrete plays a key role in controlling the load transfer and inelastic deformation of a Reinforced Concrete (RC) member under load. The typical bond stress–slip relationships specified in the model codes are given as average ‘local bond stress’ versus ‘local slip’ relationships which may be taken as statistically acceptable to represent bond–slip behavior in RC specimens with short anchorage lengths. This paper demonstrates the use of a viable analytical procedure for calibration of bond–slip relationships of the anchorage of deformed bars in RC members subjected to bending. The analytical modelling of the bond–slip relationship is based on observations of load-deflection behavior in laboratory experiments of full-scale RC specimens designed with relatively long end development of anchored bars beyond a critical section. The calibrated bond–slip relationships for selected anchorage specimens have been used to develop a modified model of peak local bond stress for splitting type bond failure. The model proposed in this paper takes into account the effect of variations of anchorage length on the bond–slip behavior, in addition to the effects of bar diameters, concrete cover and concrete strength that are typically taken into account in the model codes.

PIR with P-Cache: A New Private Information Retrieval Protocol With Improved Performance

Abstract: The increasing model of e-commerce infrastructure opens the door for secure transaction of information over the Net, keeping some records private as users’ choice within a few seconds. A client, while frequently retrieving his records, seldom wishes to hide the identity of the records to the database server. Private Information Retrieval (PIR) protocols allow users to retrieve information from a database while keeping their query private. Existing protocols have pros and cons in terms of communication and computational complexity. In some PIRs the computational complexity is reduced to O(1), and optimal, but still holds the high communication complexity O(Ns) as there is a huge amount of communication needed to satisfy the query. In our research a new PIR, namely PIR with P-cache, is introduced, based on the concept of database caching technology. In an average case, whenever a client requests a query in the system, there is a high probability to satisfy it from the P-cache instead of accessing the main database server that contains a huge amount of records. Our protocol outperforms the existing protocols in terms of both communication and computational complexity for queries supporting from P-cache and hence an improved performance.