In this paper, we have analyzed metal-semiconductor-metal photodetectors (MSM-PDs) with different nano-grating structures or shapes to improve the light absorption capacity into the device in details for high-speed communication systems and networks. The plasmonic-based MSM-PD structure demonstrates a significant improvement in light absorption capacity for the developed device compared to conventional MSM-PDs i.e., devices that have not employed the nano-gratings. The light absorption capacity of the device is varied with the variation of geometrical shapes and parameters of the nano-gratings, such as the nano-grating height, slit width and so on. These nano-grating structures are assisting in light transmission through the central slit (i.e., subwavelength apertures) efficiently, resulting in the excitation of surface plasmon polaritons (SPPs) as the incident photons interact with the nano-gratings/ nano-corrugations. This improved light transmission in the central slit along with excited SPPs results in resonant light absorption in the device. This means the light trapped inside the central slit is triggered by the SPPs to a higher order magnitude. This causes the light absorption enhancement for the device, i.e., more light is transmitted through the device instead of reflecting back to the surface. The simulation results demonstrated that the light absorption enhancement factor (LAEF) for these devices have improved dramatically due to the nano-gratings. For modeling and simulation of these devices, Opti-FDTD tool is used which is based on finite difference time domain (FDTD) method. The application of these simulated devices is in the range of 800-850-nm. The simulation results are suitable for the design of nano-structured MSM-PDs that can be used in high-speed communication systems and sensor network systems.
{"title":"A Comprehensive Study on the Impact of Various Nano-gratings on MSM-PDs for Enhancement in the Light Absorption","authors":"Alif Islam, N. Das, Mohammad M. Uzzal","doi":"10.53799/ajse.v18i1.19","DOIUrl":"https://doi.org/10.53799/ajse.v18i1.19","url":null,"abstract":"In this paper, we have analyzed metal-semiconductor-metal photodetectors (MSM-PDs) with different nano-grating structures or shapes to improve the light absorption capacity into the device in details for high-speed communication systems and networks. The plasmonic-based MSM-PD structure demonstrates a significant improvement in light absorption capacity for the developed device compared to conventional MSM-PDs i.e., devices that have not employed the nano-gratings. The light absorption capacity of the device is varied with the variation of geometrical shapes and parameters of the nano-gratings, such as the nano-grating height, slit width and so on. These nano-grating structures are assisting in light transmission through the central slit (i.e., subwavelength apertures) efficiently, resulting in the excitation of surface plasmon polaritons (SPPs) as the incident photons interact with the nano-gratings/ nano-corrugations. This improved light transmission in the central slit along with excited SPPs results in resonant light absorption in the device. This means the light trapped inside the central slit is triggered by the SPPs to a higher order magnitude. This causes the light absorption enhancement for the device, i.e., more light is transmitted through the device instead of reflecting back to the surface. The simulation results demonstrated that the light absorption enhancement factor (LAEF) for these devices have improved dramatically due to the nano-gratings. For modeling and simulation of these devices, Opti-FDTD tool is used which is based on finite difference time domain (FDTD) method. The application of these simulated devices is in the range of 800-850-nm. The simulation results are suitable for the design of nano-structured MSM-PDs that can be used in high-speed communication systems and sensor network systems.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130029162","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}
This paper introduces an Optical Code Division multiplexing (OCDMA) system using two code keying encryptions. In this paper proposed OCDMA system is designed using Semiconductor optical amplifiers (SOAs) which has nonlinear character and can implementor different logic functions. SOA based 2 × 1 Codeword Multiplexer (CMUX) is designed to multiplex the user data and a 1 × 2 Codeword DE Multiplexer (CDEMUX) to demodulate the user data. Then a multiple user access is provided using WDM system to design the whole OCDMA system. Transmission distance of 70 km is achieved with acceptable bit error rate and Q factor. Open eye diagram is also verified at the receiving end.
{"title":"OCDMA System Using Two Code Keying Encryption Introducing a SOA Based CMUX And CDEMUX Over a WDM System","authors":"Tasnuva Chowdhury, Mohammad Nasir Uddin","doi":"10.53799/ajse.v18i1.17","DOIUrl":"https://doi.org/10.53799/ajse.v18i1.17","url":null,"abstract":"This paper introduces an Optical Code Division multiplexing (OCDMA) system using two code keying encryptions. In this paper proposed OCDMA system is designed using Semiconductor optical amplifiers (SOAs) which has nonlinear character and can implementor different logic functions. SOA based 2 × 1 Codeword Multiplexer (CMUX) is designed to multiplex the user data and a 1 × 2 Codeword DE Multiplexer (CDEMUX) to demodulate the user data. Then a multiple user access is provided using WDM system to design the whole OCDMA system. Transmission distance of 70 km is achieved with acceptable bit error rate and Q factor. Open eye diagram is also verified at the receiving end.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125224594","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}
A unique design and meander line implantable antenna is examined in this paper which satisfies the requirements of ultra-wide band. The designed antenna is integrated with the electromagnetic band gap (EBG) structure based ground plane to enhance the performance. Rectangular electromagnetic band gap (EBG) structures are represented here to evaluate the antenna performance. This compact and efficient MLA antenna is applied to improve the antenna performance for numerous implantable scenarios and biomedical applications. The proposed antenna with EGB ground plane is designed for both the simplified model and anatomical realistic models for the human body and executed the performance in bio-environment. To approve the results of implantable antennas more correctly, simulation is analyzed using anatomical realistic human models. The ultimate design has the whole dimension is 15.2 x 8.8 m2. The thickness of the antenna is about 0.8 mm. FR4 is chosen as the substrate material and Copper is chosen as the patch material. The antenna is enclosed biocompatible material with silicon inside the tissue in order to protect patient safety. Significant parameters such as S11 parameter, Far field (radiation pattern), VSWR, Efficiency, Directivity, Gain of the proposed antenna have calculated and measured the performance both the simplified and realistic human models. Comparison Analysis of S11 parameter for different substrate materials and patch materials have observed. The radiation mechanism and modified design of the implantable antenna reducing Specific Absorption Rate (SAR) for safety issues. All the simulation results and measurements are obtained from CST Microwave Studio to validate the design.
研究了一种满足超宽带要求的独特设计和弯曲线植入天线。设计的天线与基于电磁带隙(EBG)结构的地平面相结合，提高了天线的性能。本文采用矩形电磁带隙结构来评价天线的性能。这种紧凑高效的MLA天线可用于改善许多植入式场景和生物医学应用的天线性能。所提出的EGB地平面天线既针对人体简化模型，又针对人体解剖真实模型进行了设计，并在生物环境中实现了性能。为了更准确地验证植入式天线的结果，采用解剖逼真的人体模型进行了仿真分析。最终设计的整体尺寸为15.2 x 8.8 m2。天线的厚度约为0.8 mm。基板材料选用FR4，贴片材料选用Copper。天线是封闭的生物相容性材料，组织内部有硅，以保护患者的安全。对该天线的S11参数、远场(辐射方向图)、驻波比、效率、方向性、增益等重要参数进行了计算和测量。对比分析了不同衬底材料和贴片材料的S11参数。基于安全考虑，研究了可植入天线的辐射机理和改进设计，降低了天线的比吸收率。所有的仿真结果和测量都是在CST微波工作室获得的，以验证设计。
{"title":"Performance Evaluation of Meander Line Implantable Antenna integrated with EBG Based Ground for Anatomical Realistic Model","authors":"Sadia Sultana, R. Basak","doi":"10.53799/ajse.v18i1.16","DOIUrl":"https://doi.org/10.53799/ajse.v18i1.16","url":null,"abstract":"A unique design and meander line implantable antenna is examined in this paper which satisfies the requirements of ultra-wide band. The designed antenna is integrated with the electromagnetic band gap (EBG) structure based ground plane to enhance the performance. Rectangular electromagnetic band gap (EBG) structures are represented here to evaluate the antenna performance. This compact and efficient MLA antenna is applied to improve the antenna performance for numerous implantable scenarios and biomedical applications. The proposed antenna with EGB ground plane is designed for both the simplified model and anatomical realistic models for the human body and executed the performance in bio-environment. To approve the results of implantable antennas more correctly, simulation is analyzed using anatomical realistic human models. The ultimate design has the whole dimension is 15.2 x 8.8 m2. The thickness of the antenna is about 0.8 mm. FR4 is chosen as the substrate material and Copper is chosen as the patch material. The antenna is enclosed biocompatible material with silicon inside the tissue in order to protect patient safety. Significant parameters such as S11 parameter, Far field (radiation pattern), VSWR, Efficiency, Directivity, Gain of the proposed antenna have calculated and measured the performance both the simplified and realistic human models. Comparison Analysis of S11 parameter for different substrate materials and patch materials have observed. The radiation mechanism and modified design of the implantable antenna reducing Specific Absorption Rate (SAR) for safety issues. All the simulation results and measurements are obtained from CST Microwave Studio to validate the design.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116679262","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}
Biomedical application is an advancing sector of research work which permits the development of a transmission link from a living body to an extrinsic device. A microstrip patch antenna is proposed in this paper for biomedical applications. The antenna is designed to operate in the Industrial, Scientific and Medical (ISM) band (2.4 – 2.4835 GHz). The thickness of the antenna is only 2.3 mm which implies that the antenna is reliable to operate under bent conditions. The dimension of the proposed antenna is 28.5 mm x 28.5 mm x 2.3 mm. In this antenna, Copper is used as the patch material and FR-4 is used as the substrate material. Three-layer human tissue model is used to analysis the performance of the antenna. Computer Simulation Technology (CST) software is used to designed the antenna and analysis the performance parameter of the antenna such as the return loss (S11 parameter), radiation pattern, operating frequency, directivity, gain, total efficiency under normal and bent conditions on the human tissue model. Performance analysis is also observed for different substrate material, different patch material, and different types of human tissues and comparison analysis of S11 parameter for the planar and bent condition. Among all of the substrate materials, FR4 provides the good antenna performance. Finally, Specific Absorption Rate (SAR) and thermal loss are evaluated to comply with the antenna safety issues.
生物医学应用是研究工作的一个前沿领域，它允许开发从活体到外部装置的传输链接。提出了一种用于生物医学的微带贴片天线。该天线设计用于在工业、科学和医疗(ISM)频段(2.4 - 2.4835 GHz)工作。天线的厚度仅为2.3 mm，这意味着天线在弯曲条件下可以可靠地工作。天线尺寸为28.5 mm × 28.5 mm × 2.3 mm。在该天线中，铜用作贴片材料，FR-4用作衬底材料。采用三层人体组织模型对天线的性能进行了分析。利用计算机仿真技术(CST)软件对天线进行设计，并在人体组织模型上对天线在正常和弯曲条件下的回波损耗(S11参数)、辐射方向图、工作频率、指向性、增益、总效率等性能参数进行分析。对不同衬底材料、不同贴片材料、不同类型人体组织进行了性能分析，并对平面和弯曲条件下的S11参数进行了对比分析。在所有基板材料中，FR4提供了良好的天线性能。最后，评估了比吸收率(SAR)和热损耗，以符合天线安全问题。
{"title":"A Novel Design and Performance Analysis of an ISM Band Antenna for Biomedical Applications","authors":"A. A. Faruk, R. Basak","doi":"10.53799/ajse.v17i3.12","DOIUrl":"https://doi.org/10.53799/ajse.v17i3.12","url":null,"abstract":"Biomedical application is an advancing sector of research work which permits the development of a transmission link from a living body to an extrinsic device. A microstrip patch antenna is proposed in this paper for biomedical applications. The antenna is designed to operate in the Industrial, Scientific and Medical (ISM) band (2.4 – 2.4835 GHz). The thickness of the antenna is only 2.3 mm which implies that the antenna is reliable to operate under bent conditions. The dimension of the proposed antenna is 28.5 mm x 28.5 mm x 2.3 mm. In this antenna, Copper is used as the patch material and FR-4 is used as the substrate material. Three-layer human tissue model is used to analysis the performance of the antenna. Computer Simulation Technology (CST) software is used to designed the antenna and analysis the performance parameter of the antenna such as the return loss (S11 parameter), radiation pattern, operating frequency, directivity, gain, total efficiency under normal and bent conditions on the human tissue model. Performance analysis is also observed for different substrate material, different patch material, and different types of human tissues and comparison analysis of S11 parameter for the planar and bent condition. Among all of the substrate materials, FR4 provides the good antenna performance. Finally, Specific Absorption Rate (SAR) and thermal loss are evaluated to comply with the antenna safety issues.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123083645","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}
This paper aims to present the impact of using oxidized layer and the effect of oxide aperture size on VCSEL’s modulation performance. After the introduction of oxidized layer, the characteristics of VCSEL have improved immensely, especially in modulation performance. The peak material gain of Al0.06Ga0.24In0.70As/InP MQW VCSEL found from the MATLAB simulation tools has been utilized for investigating the modulation characteristics of the laser model. The optical output power of 27.23 dBm is found at 2.5 mA of current injection. Later, by varying the injection current up to 2.5 mA a maximum frequency of resonance of 10.75 GHz and the equivalent -3dB cut off frequency of 11.85 GHz are achieved. It is seen that with the reduction of oxide aperture size and increase of injection current, the frequency of resonance in addition to the -3dB cut off frequency of the laser increases. The use of oxidized layer and impact of aperture size effect on VCSEL’s -3dB cut off frequency.
{"title":"Performance Analysis of Modulation Response of a Designed 1550 nm Oxide Confined Vertical Cavity Surface Emitting Laser","authors":"Md. Sajid Hossain, Dewan Mohammed Abdul Ahad","doi":"10.53799/ajse.v17i3.13","DOIUrl":"https://doi.org/10.53799/ajse.v17i3.13","url":null,"abstract":"This paper aims to present the impact of using oxidized layer and the effect of oxide aperture size on VCSEL’s modulation performance. After the introduction of oxidized layer, the characteristics of VCSEL have improved immensely, especially in modulation performance. The peak material gain of Al0.06Ga0.24In0.70As/InP MQW VCSEL found from the MATLAB simulation tools has been utilized for investigating the modulation characteristics of the laser model. The optical output power of 27.23 dBm is found at 2.5 mA of current injection. Later, by varying the injection current up to 2.5 mA a maximum frequency of resonance of 10.75 GHz and the equivalent -3dB cut off frequency of 11.85 GHz are achieved. It is seen that with the reduction of oxide aperture size and increase of injection current, the frequency of resonance in addition to the -3dB cut off frequency of the laser increases. The use of oxidized layer and impact of aperture size effect on VCSEL’s -3dB cut off frequency.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130654069","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}
Md. Saiful Islam, Md. Rifat-Ul-Karim Shovon, Abdul Goffar Khan
This paper presents a comparative study of the application of Thyristor versus IGBT in AC-DC controlled power converter. Both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle (α, for Thyristor) and triggering pulse width (, for IGBT). Also the total harmonic distortion (THD) has been observed in both the cases. It is observed that IGBT based power converter introduces more harmonics in the system, in spite of more symmetrical output voltage wave shape.
{"title":"Comparative Study of Thyristor vs IGBT Based AC-DC Power Converter","authors":"Md. Saiful Islam, Md. Rifat-Ul-Karim Shovon, Abdul Goffar Khan","doi":"10.53799/ajse.v17i3.14","DOIUrl":"https://doi.org/10.53799/ajse.v17i3.14","url":null,"abstract":"This paper presents a comparative study of the application of Thyristor versus IGBT in AC-DC controlled power converter. Both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle (α, for Thyristor) and triggering pulse width (, for IGBT). Also the total harmonic distortion (THD) has been observed in both the cases. It is observed that IGBT based power converter introduces more harmonics in the system, in spite of more symmetrical output voltage wave shape.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130929569","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}
S. Azim, Mohammad M. Uzzal, A. M. Saleque, A. Rahman
Government of Bangladesh (GoB) is implementing an emergency humanitarian project at coastal island Bhasan Char under Hatiya of Noakhali District, from September 2017 to temporarily rehabilitate a portion of incoming Rohinga refugees before they can repatriate to their home land, Myanmar. Under this project, GoB will carry out land development, construction of embankment as well as other infrastructures. This study is aimed at providing partial basic energy support to the government’s initiative of rehabilitating 103,200 Rohinga refugees. Under the study, we check the feasibility of establishing off-grid sustainable energy system. We also perform the financial analysis of the proposed energy system by considering 20 years life-span of the project. Our study shows that annual average solar insolation in Bhasan char is 4.82kWh/m2/day and daily bright sunshine hour varies from 3 hours to 11 hours. Wind flow data of Bhasan char shows the average annual wind speed of 3.74m/s which is available round the clock and throughout the year. These data justify the suitability of environment friendly off-grid solar energy system as well as wind energy system for Bhasan Char. However, considering the effective generation hours, to diversify energy sources and basing on analysis result using HOMER (Hybrid Optimization of Multiple Energy Resources) software – we are proposing a hybrid energy system with 40% contribution from wind and rest 60% from solar. Our financial analysis of the project shows a total cost of 43.848 Crore (USD 0.525 Crore) over 20-year life span. Therefore, a BDT 2.192 Crore/year is quite economical and justifiable, considering the long-term impact that it might provide to displaced 103,200 refugees as well as the solution that we are providing to adverse negative socio-economic impact on Bangladesh from Rohinga issue.
{"title":"Feasibility Study of Off-Grid Sustainable Energy System for Coastal Bhasan Char to Rehabilitate Rohinga Refugees","authors":"S. Azim, Mohammad M. Uzzal, A. M. Saleque, A. Rahman","doi":"10.53799/ajse.v17i3.11","DOIUrl":"https://doi.org/10.53799/ajse.v17i3.11","url":null,"abstract":"Government of Bangladesh (GoB) is implementing an emergency humanitarian project at coastal island Bhasan Char under Hatiya of Noakhali District, from September 2017 to temporarily rehabilitate a portion of incoming Rohinga refugees before they can repatriate to their home land, Myanmar. Under this project, GoB will carry out land development, construction of embankment as well as other infrastructures. This study is aimed at providing partial basic energy support to the government’s initiative of rehabilitating 103,200 Rohinga refugees. Under the study, we check the feasibility of establishing off-grid sustainable energy system. We also perform the financial analysis of the proposed energy system by considering 20 years life-span of the project. Our study shows that annual average solar insolation in Bhasan char is 4.82kWh/m2/day and daily bright sunshine hour varies from 3 hours to 11 hours. Wind flow data of Bhasan char shows the average annual wind speed of 3.74m/s which is available round the clock and throughout the year. These data justify the suitability of environment friendly off-grid solar energy system as well as wind energy system for Bhasan Char. However, considering the effective generation hours, to diversify energy sources and basing on analysis result using HOMER (Hybrid Optimization of Multiple Energy Resources) software – we are proposing a hybrid energy system with 40% contribution from wind and rest 60% from solar. Our financial analysis of the project shows a total cost of 43.848 Crore (USD 0.525 Crore) over 20-year life span. Therefore, a BDT 2.192 Crore/year is quite economical and justifiable, considering the long-term impact that it might provide to displaced 103,200 refugees as well as the solution that we are providing to adverse negative socio-economic impact on Bangladesh from Rohinga issue.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115442054","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}
Tubular plate lead acid deep cycle batteries are becoming more and more popular in Bangladesh to run electrical vehicles. A China made low cost charger is commonly used to charge these batteries which takes approximately 10 hours to full charge. In this paper, comparative results of charging EV tubular battery using conventional charger as well as Universal Battery Tester (UBT) have been reported. Total 8 different types of charging methods have been tested and different parameters like temperature rise, change of specific gravity of the electrolyte in the battery, variation of voltage and current, stored Ampere-Hour etc. have been observed. Thereby a comparatively quick charging method has been proposed which can ensure less temperature rise and therefore better efficiency and longer battery life.
{"title":"Optimum charging scheme of Electric Vehicle (EV) battery","authors":"A. Fattah, Abdul Goffar Khan","doi":"10.53799/ajse.v17i3.15","DOIUrl":"https://doi.org/10.53799/ajse.v17i3.15","url":null,"abstract":"Tubular plate lead acid deep cycle batteries are becoming more and more popular in Bangladesh to run electrical vehicles. A China made low cost charger is commonly used to charge these batteries which takes approximately 10 hours to full charge. In this paper, comparative results of charging EV tubular battery using conventional charger as well as Universal Battery Tester (UBT) have been reported. Total 8 different types of charging methods have been tested and different parameters like temperature rise, change of specific gravity of the electrolyte in the battery, variation of voltage and current, stored Ampere-Hour etc. have been observed. Thereby a comparatively quick charging method has been proposed which can ensure less temperature rise and therefore better efficiency and longer battery life.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131274110","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}
Over the years, there has been a growing concern to adopt new strategies for sustainable marine resource management. Coastal countries are implementing new policies, methods and plans to develop long term vision and secure financial investments for their coastal and marine spaces. Recently maritime spatial planning (MSP) is gaining attention as a new approach to sustainable marine resource management by integrating economic, environmental and social concerns is same management platform. In many countries, MSP has been proved as an effective tool to implement ecosystem based approach of planning to achieve long term maritime vision. Bangladesh, with growing economic interest on coastal and marine resources, is looking to adopt best strategies for achieving blue economy goals. However, degrading ocean health due to anthropogenic pressure and impact of climate change are major challenges that need to be faced. This paper explores implication of Maritime Spatial Planning for ocean resource management to achieve blue economy goals and overcome future environmental constraints as well. The authors aim to introduce maritime spatial planning (MSP) as potential tool for sustainable marine resource management to wide range of researchers, professionals working with coastal and marine issues in Bangladesh to encourage further research and exploration.
{"title":"Planning for Blue Economy: Prospects of Maritime Spatial Planning in Bangladesh","authors":"Kawshik Saha, A. Alam","doi":"10.53799/ajse.v17i2.10","DOIUrl":"https://doi.org/10.53799/ajse.v17i2.10","url":null,"abstract":"Over the years, there has been a growing concern to adopt new strategies for sustainable marine resource management. Coastal countries are implementing new policies, methods and plans to develop long term vision and secure financial investments for their coastal and marine spaces. Recently maritime spatial planning (MSP) is gaining attention as a new approach to sustainable marine resource management by integrating economic, environmental and social concerns is same management platform. In many countries, MSP has been proved as an effective tool to implement ecosystem based approach of planning to achieve long term maritime vision. Bangladesh, with growing economic interest on coastal and marine resources, is looking to adopt best strategies for achieving blue economy goals. However, degrading ocean health due to anthropogenic pressure and impact of climate change are major challenges that need to be faced. This paper explores implication of Maritime Spatial Planning for ocean resource management to achieve blue economy goals and overcome future environmental constraints as well. The authors aim to introduce maritime spatial planning (MSP) as potential tool for sustainable marine resource management to wide range of researchers, professionals working with coastal and marine issues in Bangladesh to encourage further research and exploration.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"15 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125762895","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}
Adaptive interface would enable Human Computer Interaction apply machine learning to cope with human carelessness (mistakes), understand user performance level and provide an interaction interface accordingly. This study tends to translate the theoretical issues of human task into working model by investigating and implementing the predicting equation of human psychomotor behavior to a rapid and aimed movement, developed by Paul Fitt in 1954. The study finds logarithmic speed-accuracy trade-off and predict user performance in a common task “point-select” using common input device mouse. The performance of user is visualized as an evidence and this visualization make a valuable step toward understanding the change required in user interface to make the interface adaptive and consistent. It proposed a method of calculating the amount of change required through learning; add extension to the theory of machine intelligence and increase knowledge of Fitts applicability in terms of machine learning.
{"title":"Adaptive Fitts for Adaptive Interface","authors":"Sajib Hasan","doi":"10.53799/ajse.v17i2.9","DOIUrl":"https://doi.org/10.53799/ajse.v17i2.9","url":null,"abstract":"Adaptive interface would enable Human Computer Interaction apply machine learning to cope with human carelessness (mistakes), understand user performance level and provide an interaction interface accordingly. This study tends to translate the theoretical issues of human task into working model by investigating and implementing the predicting equation of human psychomotor behavior to a rapid and aimed movement, developed by Paul Fitt in 1954. The study finds logarithmic speed-accuracy trade-off and predict user performance in a common task “point-select” using common input device mouse. The performance of user is visualized as an evidence and this visualization make a valuable step toward understanding the change required in user interface to make the interface adaptive and consistent. It proposed a method of calculating the amount of change required through learning; add extension to the theory of machine intelligence and increase knowledge of Fitts applicability in terms of machine learning.","PeriodicalId":224436,"journal":{"name":"AIUB Journal of Science and Engineering (AJSE)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125265676","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}
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