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An enhanced design of PAPR reduction technique 一种改进的PAPR还原技术设计
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026824
M. Mowla, Zaki Muhammad Shahriar, S. M. Mahmud Hasan
{"title":"An enhanced design of PAPR reduction technique","authors":"M. Mowla, Zaki Muhammad Shahriar, S. M. Mahmud Hasan","doi":"10.1109/ICECE.2014.7026824","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026824","url":null,"abstract":"Next generation wireless communication networks (NGN) uses one of the emerging multicarrier multiplexing transmission techniques which is known as orthogonal frequency division multiplexing (OFDM). It provides several advantages such as offering greater immunity to multipath fading & impulse noise, eliminating inter-symbol interference (ISI), inter-carrier interference (ICI) & the need for equalizers. However, OFDM have a generic problem of high peak to average power ratio (PAPR) which is defined as the ratio of the peak power to the average power of the OFDM signal. In this paper, an improved design of amplitude clipping & filtering method is proposed and implemented which shows the significant improvement in case of PAPR reduction compare to an existing method.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116616655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Minimization of output fluctuation of a fixed speed IG based wind farm without capacitor by using PMSG 用PMSG最小化无电容固定转速IG风电场输出波动
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026832
M. Sheikh, Z. Tasneem
{"title":"Minimization of output fluctuation of a fixed speed IG based wind farm without capacitor by using PMSG","authors":"M. Sheikh, Z. Tasneem","doi":"10.1109/ICECE.2014.7026832","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026832","url":null,"abstract":"Capacitors are considered as the prime element in a fixed speed Induction Generator (IG) based wind farm along with the other external controlling devices for providing the necessary reactive power compensation. But this paper proposes that the capacitors as well as the external controlling devices can be eliminated from the wind farm if Permanent Magnet Synchronous Generator (PMSG) is included in the system. The proposed model of PMSG works not only as a power producing generator but also as a controlling device for IG. A 50 MW wind farm has been considered for this study which consists of both IG and PMSG without any capacitors or controlling devices. Varying load condition has also been considered for a composite wind farm with Synchronous Generator (SG). Simulation results prove the effectiveness of the proposed system. Both the dynamic and transient analyses have been carried out by using the laboratory standard power system software package, PSCAD/EMTDC.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124930669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Dynamics of fullerene self-insertion into carbon nanotubes in water 富勒烯在水中自插入碳纳米管的动力学
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026906
M. M. Rahman, Mokter Mahmud Chowdhury, M. K. Alam
{"title":"Dynamics of fullerene self-insertion into carbon nanotubes in water","authors":"M. M. Rahman, Mokter Mahmud Chowdhury, M. K. Alam","doi":"10.1109/ICECE.2014.7026906","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026906","url":null,"abstract":"The dynamics of fullerene self-insertion into carbon nanotubes in water are studied by molecular dynamics simulations. It is revealed that the van der Waals interaction between the nanotube and fullerene introduces a spontaneous insertion of fullerene molecule inside the nanotube in the presence of water molecules when the initial separation between the nanotube and the fullerene is less than a critical distance. It is also demonstrated that the insertion process is strongly dependent upon the radius of the nanotubes and does not show a significant dependence upon the temperature or the length of the nanotubes. The study suggests possible bottom-up self-assembly of novel nanostructures like peapod (one or more fullerene molecules inside a carbon nanotube), which has great potential in the fields of nano-oscillator and futuristic quantum information processor.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113987822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Characterization of electrodeposited multiwall carbon nanotube films on silicon substrates 硅衬底上电沉积多壁碳纳米管薄膜的表征
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7027003
M. Rahman, M. A. Uddin, Ahmedullah Aziz, Tanvir Mustofa, Z. Mahmood, T. Soga, S. M. Mominuzzaman
{"title":"Characterization of electrodeposited multiwall carbon nanotube films on silicon substrates","authors":"M. Rahman, M. A. Uddin, Ahmedullah Aziz, Tanvir Mustofa, Z. Mahmood, T. Soga, S. M. Mominuzzaman","doi":"10.1109/ICECE.2014.7027003","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7027003","url":null,"abstract":"Multiwall Carbon Nanotube (MWCNT) films were deposited on Silicon (Si) substrate. The effect of 0.1% and 0.2% solutions of MWCNT incorporation with methanol were investigated. pH of various solutions before and after deposition has been analyzed. pH of the solutions was increased after deposition. Change in the variation of current density as a function of applied potential was observed. Current density was increased as the percentage of MWCNT was increased. The electrodeposited MWCNT films were characterized by SEM, UV-VIS-IR and Raman spectroscopy. In SEM micrographs, changes were observed in the electrodeposited films compared to pure Si substrates. Raman measurement proved the amorphous nature of MWCNT in these thin films. From the UV-VIS-IR measurement it was observed that the absorption of light has been increased by the increase of MWCNT. So the optoelectronic properties of the electrodeposited films are tunable by electrodeposition using MWCNT on Si substrates.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122638312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Development of a microcontroller-based AC voltage controller with soft start capability 基于单片机的交流电压软启动控制器的研制
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026977
Arifur Rahman, N. Ansari, Nazneen Ahmed, K. Rahman, Md. Zahurul Islam
{"title":"Development of a microcontroller-based AC voltage controller with soft start capability","authors":"Arifur Rahman, N. Ansari, Nazneen Ahmed, K. Rahman, Md. Zahurul Islam","doi":"10.1109/ICECE.2014.7026977","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026977","url":null,"abstract":"This paper describes the development of a prototype of a microcontroller-based phase angle controlled single-phase AC voltage controller that can efficiently control AC voltage and also accommodates soft start capability for single-phase induction motors. The output voltage of the controller is regulated to maintain a desired fixed RMS value and provide stabilized output by implementing a feedback control system. One microcontroller generates PWM signals in synchronism with the supply voltage to control the firing angle of thyristors while a second microcontroller remains dedicated for measuring the RMS value of the output voltage and sending that to the main microcontroller for the purpose of feedback control. The provision for soft starting of a load is also incorporated into this prototype.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131097353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Low temperature synthesis of carbon nanotubes and carbon nanospheres 碳纳米管和碳纳米球的低温合成
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026936
M. G. Kibria, A. K. M. Bazlur Rashid
{"title":"Low temperature synthesis of carbon nanotubes and carbon nanospheres","authors":"M. G. Kibria, A. K. M. Bazlur Rashid","doi":"10.1109/ICECE.2014.7026936","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026936","url":null,"abstract":"Recently nanomaterial have gained a great interest due to their unique electrical and optical properties. The area of carbon materials have since been dominated by studies of carbon nanotubes. So far numerous methods have been developed for the synthesis of CNTs; in this work we have synthesized CNTs via a simple chemical route. Carbon nanotubes (CNTs) are successfully synthesized by heating a mixture of ferrocene and ammonium chloride at temperature as low as 250 °C. Carbon nanospheres are also observed here. Carbon spheres (CSs) of different sizes and shapes are present randomly in the sample. Field emission scanning electron microscopy is performed to examine the morphology of the sample and Energy Dispersive X-ray Spectroscopy (EDX) is performed to examine the composition.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127818450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Robust control of robot manipulator based on estimation of upper bounds on parametric uncertainty 基于参数不确定性上界估计的机器人机械臂鲁棒控制
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026886
A. Khalate, R. Dey, G. Ray
{"title":"Robust control of robot manipulator based on estimation of upper bounds on parametric uncertainty","authors":"A. Khalate, R. Dey, G. Ray","doi":"10.1109/ICECE.2014.7026886","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026886","url":null,"abstract":"This paper proposes a robust control law for trajectory tracking problem of an n-link robot manipulator subjected to parametric uncertainty. The control law is derived based on Lyapunov theory, which guarantees asymptotic stability of the system. The upper bounds on the parametric uncertainties are determined with estimation law and an additional control input is updated according to the estimated value. The proposed methods improve tracking performance and provide less control effort with no chattering effect in control torques. The simulation results of 2-link robot manipulator are presented to validate the effectiveness of the proposed method.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133767808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Design and optimal cost analysis of hybrid power system for Kutubdia island of Bangladesh 孟加拉国库图布迪亚岛混合电力系统设计及最优成本分析
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026871
A. Sikder, Nishat Anjum Khan, A. Hoque
{"title":"Design and optimal cost analysis of hybrid power system for Kutubdia island of Bangladesh","authors":"A. Sikder, Nishat Anjum Khan, A. Hoque","doi":"10.1109/ICECE.2014.7026871","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026871","url":null,"abstract":"Hybrid power system is the newest idea of utilizing renewable energy resources for generating electricity. Power generation largely depends on fossil fuel and as the total amount of reserved fossil fuel is decreasing we have to search for new resources for power generation. Hybrid power system usually demonstrates lower cost of production and higher reliability than the power system only using one renewable source. Geographically, Bangladesh is situated in an area having many renewable resources. Utilization of these resources could help to minimize the power crisis of Bangladesh. As Bangladesh has a large coastal area, we can have moderate wind speed and tidal wave throughout the year. A hybrid power system utilizing wind and tidal energy will be effective to generate power in the coastal areas. This paper shows the design and optimal cost analysis of a hybrid power system using wind and tidal energy in the Kutubdia island of Bangladesh.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134189541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Effects of physical parameters on subthreshold characteristics of nitride and antimonide-based double material gate (DMG) HEMTs 物理参数对氮和锑基双材料栅极hemt亚阈值特性的影响
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026974
Arman-Ur-Rashid, M. A. Hossain, Tanvir Rahman, F. M. Mohammedy
{"title":"Effects of physical parameters on subthreshold characteristics of nitride and antimonide-based double material gate (DMG) HEMTs","authors":"Arman-Ur-Rashid, M. A. Hossain, Tanvir Rahman, F. M. Mohammedy","doi":"10.1109/ICECE.2014.7026974","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026974","url":null,"abstract":"In this papar we have varied the physical parameters of double material gate (DMG) HEMT and noted the change in subthreshold characteristics. The physical parameters are: control-gate length, barrier layer thickness and the work function difference between two gate materials. A semi-classical analytical model has been used to determine the channel potential and electric field. One nitride-based and three antimonide-based formations have been used in this work and their results have been compared. We have found that nitride-based DMG HEMTs are less sensitive to process variation of gate fabrication compared to antimonide-based DMG HEMTs. It has been seen that variation in barrier layer thickness affects nitride-based HEMTs more strongly than antimonide-based DMG HEMTs, while the effect of change in workfunction difference is more prominent in antimonide-based HEMTs. Among the antimonide-based HEMTs, it have been seen that the formation with deep conduction band discontinuity is more susceptible to change in control-gate length than formations with shallow conduction band discontinuity. But effects of barrier layer thickness change and change in workfunction difference are more noticeable in shallow conduction band formations, making these formations more effective as double material gate (DMG) structures.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133113872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Effect of stone-wales defects and edge roughness on the switching and frequency performance of graphene nanoribbon-FET 石纹缺陷和边缘粗糙度对石墨烯纳米带fet开关和频率性能的影响
8th International Conference on Electrical and Computer Engineering Pub Date : 2014-12-01 DOI: 10.1109/ICECE.2014.7026932
A. Saha, G. Saha, A. Harun-ur Rashid
{"title":"Effect of stone-wales defects and edge roughness on the switching and frequency performance of graphene nanoribbon-FET","authors":"A. Saha, G. Saha, A. Harun-ur Rashid","doi":"10.1109/ICECE.2014.7026932","DOIUrl":"https://doi.org/10.1109/ICECE.2014.7026932","url":null,"abstract":"The novel electronic properties of graphene nanoribbons (GNRs) including purely two-dimensional structure along with its tunable bandgap have led to intense research into possible applications of this material in nanoscale devices. However, as yet, dimensions of its possibilities in practical device levels have remained inconsistent. In this paper we propose a model for GNR-FET that is made from only Armchair GNRs. Our complete NEGF-based simulation reveals its potential for fast digital electronics with On/Off ratio up to 103, transconductance of 8.5×103 nS/nm which lead to a analog operational frequency up to 3.3THz. The effects of Stone-Wales defects and Edge Roughness in GNRs have been analysed here that shows switching and frequency performance degradation of such GNR-FETs.","PeriodicalId":335492,"journal":{"name":"8th International Conference on Electrical and Computer Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115641961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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