University of Science and Technology Chittagong
Chittagong, Bangladesh

University of Science & Technology Chittagong is one of the premier private universities in Bangladesh. The university was established with the sponsorship of a private charity on May 13, 1989. Previously it was started as Institute of Applied Health science , later it was upgraded to USTC as a full phased university after the promulgation of the Private University Act,1992. Wikipedia.

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Mazumder K.,University of Science and Technology Chittagong | Mazumder K.,Osaka University | Tanaka K.,RIKEN | Fukase K.,Osaka University
Molecules | Year: 2013

Structure-activity relationships of ursane-type pentacyclic triterpenes obtained from natural sources and by chemical derivatization are reviewed. Ursolic acid, corosolic acid, and a new ursane-type pentacyclic triterpene, 7,24-dihydroxyursolic acid, were isolated from the methanolic extract of the leaves of the Bangladeshi medicinal plant, Saurauja roxburghii. Derivatization of ursolic acid by oxidation with dioxoruthenium (VI) tetraphenylporphyrins was investigated. Oxidation selectivity on the terpene structure was modulated by the auxiliaries introduced on the tetraphenylporphyrin. The natural triterpenes and oxidized derivatives were tested for cytotoxicity against the C6 rat glioma and A431 human skin carcinoma cell lines. Although they have the same ursane-type pentacyclic triterpene cores, the position and numbers of hydroxyls on the terpene structures significantly affected the activity and the selectivity towards the tested cell lines. © 2013 by the authors; licensee MDPI, Basel, Switzerland.

Chakraborty S.,University of Science and Technology Chittagong | Razzak M.A.,Independent University, Bangladesh
International Journal of Renewable Energy Research | Year: 2014

This paper introduces a topology for transformer-less pure sine wave grid-tie inverter (GTI) for photovoltaic (PV) applications. The proposed GTI employs a dual-stage switch mode boost converter, a dual-stage switch mode buck converter, an H-bridge inverter and a T-LCL immittance conversion circuit. For switching of GTI power circuit, a combination of sinusoidal pulse width modulation (SPWM) and square wave signal under grid synchronization conditions are applied. As the suggested method is entirely transformer-less, it astonishingly reduces Total Harmonic Distortion (THD) which is less than 0.1%, minimizes the size of the inverter and increases inverter efficiency up to 97%. The T-LCL immittance conversion circuit not only reduces the harmonic distortation of inverter output but also provides a nearly constant output current thereby stabilizing the system instanteously. Using the designed values of circuit components, the overall performance of the proposed inverter is simulated by using PSIM software. The simulation results not only show that the proposed inverter eliminates vast harmonics but also prove that it is highly efficient, compact in size and cost effective due to being transformer-less.

Rashid S.Q.,University of Science and Technology Chittagong
Bangladesh Journal of Obstetrics and Gynecology | Year: 2011

Objective: Abdominal circumference measurement is an important parameter for determining fetal growth. Fetal growth will be more accurately assessed if we use tables constructed on our own population. A table of fetal gestational age estimation by abdominal circumference in Bangladeshi population is prepared, so that a quick assessment of its growth can be made. Methods: This study was a prospective, cross-sectional study, conducted on well dated, singleton pregnancies. A table and a graph were prepared after fitting Polynomial regression models. Results: Nomogram for gestational age estimation by abdominal circumference was prepared. 1223 patients were included in the study. Percentiles, mean and standard deviations were derived from the raw data. Polynomial regression model was a good fit to the data. Standard deviations increased with gestational age. In the early second trimester Bangladeshi and western studies were similar but as pregnancy advanced there was variation between the two races. Conclusion: This chart can be useful for Bangladeshi population, by helping in assessment of fetal growth and gestational age by abdominal circumference, especially in the 3 rd trimester. This is so, because abdominal circumference is very sensitive to fetal nutritional status.

Rashid S.Q.,University of Science and Technology Chittagong
Journal of Medical Ultrasound | Year: 2015

Objective: This study was conducted to determine the accuracy of estimated fetal weight (EFW) by ultrasound, compared with birth weight (BW), in Bangladesh. Methods: This is a prospective, cross-sectional study on well-dated singleton fetuses. The accuracy of weight-prediction formula is determined by assessing how well the formula works in a group of fetuses scanned close to delivery. Results of previous studies were compared with those of this study. Results: A total of 73 infants were included in the analysis to determine the accuracy of EFW. The mean absolute difference between ultrasound EFW and BW was -64.5 (±218.5) g, and the mean relative difference or the mean percentage error of fetal weight estimation was -1.4% (±7.6%). Conclusion: Ultrasound is a reliable modality for estimating fetal weight in a Bangladeshi population using the head circumference, femur length, and abdominal circumference formula of Hadlock. © 2015 Elsevier Taiwan LLC and the Chinese Taipei Society of Ultrasound in Medicine.

Chakraborty S.,University of Science and Technology Chittagong
Journal of Electrical Engineering | Year: 2015

This paper introduces design and analysis of a hybrid solar-wind energy system using CUK and SEPIC converters. This design lets two sources supply the load individually or simultaneously depending on the availability of the energy sources. The proposed design deploys a switch mode CUK converter and a switch mode SEPIC converter. The designed CUK and SEPIC converters have been deployed to run a single-phase full-bridge grid connected inverter for residential application. The proposed design has been mathematically modeled which has been simulated via PSIM software as well and finally the results have been presented to confirm the effectiveness of this hybrid system.

Afzal M.H.B.,University of Science and Technology Chittagong
2013 4th International Conference on Computing, Communications and Networking Technologies, ICCCNT 2013 | Year: 2013

Fiber optic sensors are one of the most competent, functional and accessible types of sensors that can be applied for diverse purposes and it delivers sustainable and effective results for most of the cases. It is frequently used to sense, measure and evaluate the physical and chemical properties such as microbending, strains, vibrations, accelerations, linear and rotary position, temperatures, pressures, determination of pH, fluid material's refractive index, checking of long pipeline's status etc. Polydimethylsiloxane (PDMS) is a special form of silicone elastomer or silicone rubber and it has very realistic and particular advantages as a diaphragm or coating material for fiber optic sensing technology for improved, more precise and steady output. This paper presents a comprehensive analysis of prior FOS technology with various coating materials for enhanced environmental application. A dedicated part of this paper also explains the exclusive characteristics of PDMS material and suitability for FOS coating. Potential future scope of PDMS material in FOS technology is discussed in the final section of this paper. © 2013 IEEE.

Afzal M.H.B.,University of Science and Technology Chittagong
2013 4th International Conference on Computing, Communications and Networking Technologies, ICCCNT 2013 | Year: 2013

Fibre optic sensing technology is one of the versatile and effective sensing technologies in the modern sensor era. Optical fibre sensing successfully manage to catch the positive attention of premium sensor-fabrication industries as well as the top researchers, scientists and automation engineers are preferring to apply FOS technology in various field applications in recent times. Furthermore, fiber optic sensors have a diversity of particular advantages such as faster response compare to other available sensing methods, economical fabrication procedure, very user-friendly, exceedingly receptive plus non-responsive to electromagnetic interference. This paper comprehensively discusses about various important large-scale practical applications of FOS technology both in government sectors as well as in private sectors. This paper also emphasizes on environmental application of FOS technology and also explains in details why FOS is preferable option for water quality management system. This paper also specifically highlights about latest available FOS materials which has been applied in the field of water quality management extensively to ensure a sustainable environment and to check effectively the quality of water for local residents. A dedicated part of this paper also discusses the significant advantages of FOS technology in annual rainfall trend analysis. © 2013 IEEE.

Rashid S.Q.,University of Science and Technology Chittagong
Journal of Medical Ultrasound | Year: 2013

Background: Assessment of amniotic fluid volume (AFV) is important for determining fetal well-being in the uterus. This assessment can be made subjectively or objectively by measuring the amniotic fluid pockets. Methods: Single deepest pocket (SDP) measurement was the first method for objectively determining AFV in a noninvasive manner. This is a faster technique compared with the Amniotic Fluid Index method and is the only easy objective way in case of multiple pregnancies, especially in dizygotic gestation. Results: In this study, SDP was found to range between 1.7 and 7.6 cm from 14 to 41 weeks of gestational age. Conclusion: Therefore, SDP >7.6 cm can be considered as polyhydramnios and SDP <1.7 cm as oligohydramnios. © 2013.

Hossain D.,University of Science and Technology Chittagong
Pediatric Dermatology | Year: 2014

Scabies is a common parasitic disease that can be recognized by the development of itchy lesions and a predilection for certain places on the body. It may infrequently present with patchy lesions. We report a patient with well-defined annular patches. Histopathology showed an egg of the scabies mite in the epidermis. Treatment with permethrin cream resulted in complete resolution of her disease. © 2012 Wiley Periodicals, Inc.

Nasim R.,University of Science and Technology Chittagong
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST | Year: 2012

Network Services universally rely upon Authentication and Authorization mechanisms to ensure secure and personalized service provision. Protocols, such as Diameter provides a reliable framework for efficient access control to network services utilized by network devices. This framework can also encompass application level services e.g. web applications accessed via web browsers [1]. On the other hand, the prevalence of Internet based services and applications have brought about the burden of identity management among distributed security domains, an issue not specifically addressed by protocols such as Diameter. Efforts such as OpenID alleviate this difficulty by proposing an application level framework based on open standards to realize single sign on/off [2] semantics with regard to application level services. However, these technologies do not build upon existing security infrastructure, require significant investment in terms of technology adoption and have yet to receive industry wide acceptance and support. This paper presents Diameter Single Sign On - a framework that provides single sign on/off semantics in the context of network and application level services by harnessing the strengths of existing and proven authentication and authorization infrastructure. Because of combination of the Diameter protocol with Single Sign On and OpenID the proposed architecture overcomes the problem of identity management and also builds on existing security infrastructure. © Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2012.

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