Jingli Li, Di Wu, Z. Shan, Rongshi Chen, Boyu Liu, E. Han
Different from the positive correlation with strain-rate of elongation, the compressive flow behaviors were unaffected by strain-rate in cast Mg-10Gd-3Y-0.5Zr (wt.%) alloys. This was attributed to the combined effect of loading mode and rare-earth elements, resulting that twinning was suppressed in tension but prevailed in compression. It was concluded that the rare-earth elements inhibited twinning. However, this suppression effect can be reduced or eliminated in compression due to the prior prismatic slip.
{"title":"Tension-Compression Asymmetric Twinning Behavior in a Cast Mg-Gd-Y-Zr Alloy","authors":"Jingli Li, Di Wu, Z. Shan, Rongshi Chen, Boyu Liu, E. Han","doi":"10.2139/ssrn.3542978","DOIUrl":"https://doi.org/10.2139/ssrn.3542978","url":null,"abstract":"Different from the positive correlation with strain-rate of elongation, the compressive flow behaviors were unaffected by strain-rate in cast Mg-10Gd-3Y-0.5Zr (wt.%) alloys. This was attributed to the combined effect of loading mode and rare-earth elements, resulting that twinning was suppressed in tension but prevailed in compression. It was concluded that the rare-earth elements inhibited twinning. However, this suppression effect can be reduced or eliminated in compression due to the prior prismatic slip.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123810241","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}
Prasenjit Bishal, Sarbojit Ghosh, Suvojyoti Podder, Sudip Saha Roy, A. Ghosal, Suprakrash Patra, Indranath Sarkar
The prototype model of Robotic Bulldozer for Automation has been developed so that it can be used for digging and drilling in the areas using remote controls where manually digging and drilling is not possible. The ARDUINO MEGA 2560 has been used for overall control signal generation to make bulldozer operative through commands from smart devices such as mobile phones. Application software developed and tested for its successful connectivity to the bulldozer prototype developed.
自动化机器人推土机的原型模型已经开发出来，因此它可以用于在使用遥控无法手动挖掘和钻探的地区进行挖掘和钻探。ARDUINO MEGA 2560用于产生整体控制信号，通过手机等智能设备的命令使推土机运行。应用软件的开发和测试，其成功连接到推土机原型开发。
{"title":"Robotic Bulldozer Prototype for Automation","authors":"Prasenjit Bishal, Sarbojit Ghosh, Suvojyoti Podder, Sudip Saha Roy, A. Ghosal, Suprakrash Patra, Indranath Sarkar","doi":"10.2139/ssrn.3517077","DOIUrl":"https://doi.org/10.2139/ssrn.3517077","url":null,"abstract":"The prototype model of Robotic Bulldozer for Automation has been developed so that it can be used for digging and drilling in the areas using remote controls where manually digging and drilling is not possible. The ARDUINO MEGA 2560 has been used for overall control signal generation to make bulldozer operative through commands from smart devices such as mobile phones. Application software developed and tested for its successful connectivity to the bulldozer prototype developed.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116245235","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 discusses the inherent difficulties presented by Fast Fourier Transform in factoring the time domain signal into its frequency domain and presents an alternative method to determine them by analysing the data in time domain itself. The frequencies identifiable in FFT implementation is limited by the nyquist criteria, which enables to identify the higher harmonics albit low amplitudes by increasing the sampling frequency and number of samples passed on to the FFT algorithm. The frequencies whether meaningful or not will be identified in this implementation, thus presenting typical problem of frequency flow. But, if the participating harmonics are known a priori, the problem can be addressed by matching the contour of the participating harmonic sinusoids. As since only the known harmonics are addressed in this approach, the difficulty of frequency flow and appearance of fractional frequencies, which otherwise would have no meaning and interpretation are taken care of. The codes are based on the time domain split of information into a matrix vector form and obtaining the solution by least square method, via regression. Complete mathematical formulation for the proposed method and an example is presented. For ascertaining the applicability, the initial signal has been compared with the reconstructed signal, which is in good agreement.
{"title":"A Novel Way for Fourier Expansion Using Similarity Matching in Time Domain","authors":"P. Borah, S. Singh, S. Samanta","doi":"10.2139/ssrn.3516635","DOIUrl":"https://doi.org/10.2139/ssrn.3516635","url":null,"abstract":"This paper discusses the inherent difficulties presented by Fast Fourier Transform in factoring the time domain signal into its frequency domain and presents an alternative method to determine them by analysing the data in time domain itself. The frequencies identifiable in FFT implementation is limited by the nyquist criteria, which enables to identify the higher harmonics albit low amplitudes by increasing the sampling frequency and number of samples passed on to the FFT algorithm. The frequencies whether meaningful or not will be identified in this implementation, thus presenting typical problem of frequency flow. But, if the participating harmonics are known a priori, the problem can be addressed by matching the contour of the participating harmonic sinusoids. As since only the known harmonics are addressed in this approach, the difficulty of frequency flow and appearance of fractional frequencies, which otherwise would have no meaning and interpretation are taken care of. The codes are based on the time domain split of information into a matrix vector form and obtaining the solution by least square method, via regression. Complete mathematical formulation for the proposed method and an example is presented. For ascertaining the applicability, the initial signal has been compared with the reconstructed signal, which is in good agreement.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122899573","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}
L. Roy, Sudipta Das, Sagnik Bhattacharya, Anushka Chakraborty, A. Dey
Smoking is a major public health problem. In this paper, we introduce a new approach regarding the analysis of the Heart Rate Variability (HRV) signals using Information based Similarity Index Method. From Electrocardiogram (ECG) signals first HRV signals extracted using Moving Window iteration technique. Finally study the changes of the R-R interval signals before and after smoking of twenty young male volunteers using 3 bit rank from Symbolic Dynamics which is extracted from Forced Dynamics of the original signals. Then we compare probability distributions between each pair of subjects both in normal and smoking states by using Q-Q plot. Our experimental provides satisfactory results in this context.
{"title":"Effects of Smoking on Heart Rate Variability through Information Based Similarity Index","authors":"L. Roy, Sudipta Das, Sagnik Bhattacharya, Anushka Chakraborty, A. Dey","doi":"10.2139/ssrn.3515147","DOIUrl":"https://doi.org/10.2139/ssrn.3515147","url":null,"abstract":"Smoking is a major public health problem. In this paper, we introduce a new approach regarding the analysis of the Heart Rate Variability (HRV) signals using Information based Similarity Index Method. From Electrocardiogram (ECG) signals first HRV signals extracted using Moving Window iteration technique. Finally study the changes of the R-R interval signals before and after smoking of twenty young male volunteers using 3 bit rank from Symbolic Dynamics which is extracted from Forced Dynamics of the original signals. Then we compare probability distributions between each pair of subjects both in normal and smoking states by using Q-Q plot. Our experimental provides satisfactory results in this context.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122307852","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}
Infrastructure project delays and cost overrun are caused by ineffective use of organizational skills, processes, and resources by project managers in the construction industry. Cost overrun and schedule delay in Qatari infrastructure projects have had damaging effects on the national economy by way of claims and litigation, contractual disputes, delays in dependent projects, and project abandonment. This integrated literature review was framed by three conceptual models developed by Gill to outline the capacity management needs within a construction company. Being an extract of a broader qualitative multiple case study on the perceptions of project managers regarding how they utilize capacity-planning practices to mitigate project schedule delay and cost overrun in government-funded infrastructure projects in Qatar, this synthesis evidences the importance of adequate and effective capacity-planning practices to drive infrastructure project success. This overview provides a foundation to support future targeted research while promoting the practice of effective capacity planning. Addressing the capacity planning gap promises timely completion of infrastructure projects and enhanced socio-economic development.
{"title":"Project Managers’ Capacity-Planning Practices for Infrastructure Projects in Qatar: A Narrative Literature Review","authors":"EM Ojo, D. Halkias, Michael Neubert","doi":"10.2139/ssrn.3513774","DOIUrl":"https://doi.org/10.2139/ssrn.3513774","url":null,"abstract":"Infrastructure project delays and cost overrun are caused by ineffective use of organizational skills, processes, and resources by project managers in the construction industry. Cost overrun and schedule delay in Qatari infrastructure projects have had damaging effects on the national economy by way of claims and litigation, contractual disputes, delays in dependent projects, and project abandonment. This integrated literature review was framed by three conceptual models developed by Gill to outline the capacity management needs within a construction company. Being an extract of a broader qualitative multiple case study on the perceptions of project managers regarding how they utilize capacity-planning practices to mitigate project schedule delay and cost overrun in government-funded infrastructure projects in Qatar, this synthesis evidences the importance of adequate and effective capacity-planning practices to drive infrastructure project success. This overview provides a foundation to support future targeted research while promoting the practice of effective capacity planning. Addressing the capacity planning gap promises timely completion of infrastructure projects and enhanced socio-economic development.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"372 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123408924","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}
With the development of autonomous development technology, the need for additional applications to be used inside and outside the vehicle is increasing. As a result of the literature review, many applications have been developed to display vehicle data directly on the monitor, with reflections on glass, and on hardware devices. These applications have been developed only for a defined problem and for a particular autonomous system. In this study, a basic autonomous vehicle software infrastructure and mobile Augmented Reality application that can work on Android devices have been developed. The Mobile Augmented Reality app serves inside and outside the vehicle. In addition, this application has been shown to support multiple autonomous system infrastructures.
{"title":"Autonomous Vehicle and Augmented Reality Usage","authors":"Dr. Yusuf Uzun, Mehmet Bilban","doi":"10.31033/ijemr.9.6.6","DOIUrl":"https://doi.org/10.31033/ijemr.9.6.6","url":null,"abstract":"With the development of autonomous development technology, the need for additional applications to be used inside and outside the vehicle is increasing. As a result of the literature review, many applications have been developed to display vehicle data directly on the monitor, with reflections on glass, and on hardware devices. These applications have been developed only for a defined problem and for a particular autonomous system. In this study, a basic autonomous vehicle software infrastructure and mobile Augmented Reality application that can work on Android devices have been developed. The Mobile Augmented Reality app serves inside and outside the vehicle. In addition, this application has been shown to support multiple autonomous system infrastructures.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133968710","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}
The implied volatility smile surface is the basis of option pricing, and the dynamic evolution of the option volatility smile surface is difficult to predict. In this paper, attention mechanism is introduced into LSTM, and a volatility surface prediction method combining deep learning and attention mechanism is pioneeringly established. LSTM's forgetting gate makes it have strong generalization ability, and its feedback structure enables it to characterize the long memory of financial volatility. The application of attention mechanism in LSTM networks can significantly enhance the ability of LSTM networks to select input features. The experimental results show that the two strategies constructed using the predicted implied volatility surfaces have higher returns and Sharpe ratios than that the volatility surfaces are not predicted. This paper confirms that the use of AI to predict the implied volatility surface has theoretical and economic value. The research method provides a new reference for option pricing and strategy.
{"title":"Forecasting Implied Volatility Smile Surface via Deep Learning and Attention Mechanism","authors":"Shengli Chen, Zili Zhang","doi":"10.2139/ssrn.3508585","DOIUrl":"https://doi.org/10.2139/ssrn.3508585","url":null,"abstract":"The implied volatility smile surface is the basis of option pricing, and the dynamic evolution of the option volatility smile surface is difficult to predict. In this paper, attention mechanism is introduced into LSTM, and a volatility surface prediction method combining deep learning and attention mechanism is pioneeringly established. LSTM's forgetting gate makes it have strong generalization ability, and its feedback structure enables it to characterize the long memory of financial volatility. The application of attention mechanism in LSTM networks can significantly enhance the ability of LSTM networks to select input features. The experimental results show that the two strategies constructed using the predicted implied volatility surfaces have higher returns and Sharpe ratios than that the volatility surfaces are not predicted. This paper confirms that the use of AI to predict the implied volatility surface has theoretical and economic value. The research method provides a new reference for option pricing and strategy.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134408079","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}
R. S K, Sethuramalingam P, A. A, L. N, Sivashankar P
In recent years, unconventional machining processes are the commonly used for machining the complex shapes over the hard materials with high precision. Among these processes, Electrical discharge machining is producing the better surface finish and easy to control the machining parameters. In this research, EDM process had used to drill the blind holes on the Al6061 SiC metal matrix composite to obtain the good surface finish, higher material removal rate and lesser tool wear by optimizing the pulse on time, current and flushing pressure using firefly algorithm. The identified optimal and feasible parameters had been used to fabricate the product and the characterization of machined work pieces were done using SEM and mechanical testing. In this machining process optimization, the relations between the machining parameters and the output performance have been developed through SPSS software and this relation had been utilized as the objective function for the firefly algorithm. Firefly algorithm is one of the emerging algorithms used to identify the optimal values for the NP-hard problem with multiple objectives and constraints. The obtained machining parameters through the firefly algorithm have been experimented and the test results are in the satisfactory level. So the research concluded that the firefly algorithm can be best suitable to identify the optimal EDM process parameters.
{"title":"Optimization of Machining Parameters of EDM Of Al6061-Sic MMC Using Firefly Algorithm","authors":"R. S K, Sethuramalingam P, A. A, L. N, Sivashankar P","doi":"10.2139/ssrn.3687896","DOIUrl":"https://doi.org/10.2139/ssrn.3687896","url":null,"abstract":"In recent years, unconventional machining processes are the commonly used for machining the complex shapes over the hard materials with high precision. Among these processes, Electrical discharge machining is producing the better surface finish and easy to control the machining parameters. In this research, EDM process had used to drill the blind holes on the Al6061 SiC metal matrix composite to obtain the good surface finish, higher material removal rate and lesser tool wear by optimizing the pulse on time, current and flushing pressure using firefly algorithm. The identified optimal and feasible parameters had been used to fabricate the product and the characterization of machined work pieces were done using SEM and mechanical testing. In this machining process optimization, the relations between the machining parameters and the output performance have been developed through SPSS software and this relation had been utilized as the objective function for the firefly algorithm. Firefly algorithm is one of the emerging algorithms used to identify the optimal values for the NP-hard problem with multiple objectives and constraints. The obtained machining parameters through the firefly algorithm have been experimented and the test results are in the satisfactory level. So the research concluded that the firefly algorithm can be best suitable to identify the optimal EDM process parameters.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121751203","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}
Changing and emerging legal technologies have had, and will continue to have, a significant impact on the evolution of the justice system by assisting to inform, support and advise participants (supportive technologies), by replacing activities and functions that were previously carried out by humans (replacement technologies), and by significantly changing processes (disruptive technologies).1 Many of the technologies being developed have overlapping purposes and functions.
{"title":"Humans and Justice Machines: Emergent Legal Technologies and Justice Apps","authors":"Tania Sourdin, Bin Li","doi":"10.2139/ssrn.3662091","DOIUrl":"https://doi.org/10.2139/ssrn.3662091","url":null,"abstract":"Changing and emerging legal technologies have had, and will continue to have, a significant impact on the evolution of the justice system by assisting to inform, support and advise participants (supportive technologies), by replacing activities and functions that were previously carried out by humans (replacement technologies), and by significantly changing processes (disruptive technologies).1 Many of the technologies being developed have overlapping purposes and functions.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"164 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125958847","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}
Abstract The electronic stopping power of nickel-based equiatomic solid solutions alloys NiCr, NiFe and NiCo for protons and alpha projectiles is investigated in detail using real-time time-dependent density functional theory over a wide range of velocities. Recently developed numerical electronic structure methods are used to probe fundamental aspects of electron-ion coupling non-perturbatively and in a fully atomistic context, capturing the effect of the atomic scale disorder. The effects of particular electronic band structures and density of states reflect in the low velocity limit behavior. We compare our results for the alloys with those of a pure nickel target to understand how alloying affects the electronic stopping. We discover that NiCo and NiFe have similar stopping behavior as Ni while NiCr has an asymptotic stopping power that is more than a factor of two larger than its counterparts for velocities below 0.1 a.u.. We show that the low-velocity limit of electronic stopping power can be manipulated by controlling the broadening of the d-band through the chemical disorder. In this regime, the Bragg’s additive rule for the stopping of composite materials also fails for NiCr.
{"title":"Effect of Chemical Disorder on the Electronic Stopping of Solid Solution Alloys","authors":"E. Quashie, R. Ullah, X. Andrade, A. Correa","doi":"10.2139/ssrn.3525138","DOIUrl":"https://doi.org/10.2139/ssrn.3525138","url":null,"abstract":"Abstract The electronic stopping power of nickel-based equiatomic solid solutions alloys NiCr, NiFe and NiCo for protons and alpha projectiles is investigated in detail using real-time time-dependent density functional theory over a wide range of velocities. Recently developed numerical electronic structure methods are used to probe fundamental aspects of electron-ion coupling non-perturbatively and in a fully atomistic context, capturing the effect of the atomic scale disorder. The effects of particular electronic band structures and density of states reflect in the low velocity limit behavior. We compare our results for the alloys with those of a pure nickel target to understand how alloying affects the electronic stopping. We discover that NiCo and NiFe have similar stopping behavior as Ni while NiCr has an asymptotic stopping power that is more than a factor of two larger than its counterparts for velocities below 0.1 a.u.. We show that the low-velocity limit of electronic stopping power can be manipulated by controlling the broadening of the d-band through the chemical disorder. In this regime, the Bragg’s additive rule for the stopping of composite materials also fails for NiCr.","PeriodicalId":102139,"journal":{"name":"Other Topics Engineering Research eJournal","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127283782","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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