There is an evident trend to elevate pressure ratio of a single stage of a turbo compressors - axial compressors in particular. Q-3-D computer program based on wind tunnel test data was applied to research possible parameters of axial stage candidates with pressure ratio 3,0. Influence of two main design parameters on expected efficiency, periphery blade speed and flow structure was studied. Acceptable level of efficiency and inlet Mach number are expected at flow rate coefficient = 0.35 and flow deflection angle = 12 degrees. The calculation results have led to a stage candidate for further analysis and improvement by field type and CFD programs.
{"title":"Mathematical Modelling and Analysis of an Axial Compressor Supersonic Stage Impeller","authors":"Y. Galerkin, K. Soldatova, A. Rekstin","doi":"10.1145/3177457.3177469","DOIUrl":"https://doi.org/10.1145/3177457.3177469","url":null,"abstract":"There is an evident trend to elevate pressure ratio of a single stage of a turbo compressors - axial compressors in particular. Q-3-D computer program based on wind tunnel test data was applied to research possible parameters of axial stage candidates with pressure ratio 3,0. Influence of two main design parameters on expected efficiency, periphery blade speed and flow structure was studied. Acceptable level of efficiency and inlet Mach number are expected at flow rate coefficient = 0.35 and flow deflection angle = 12 degrees. The calculation results have led to a stage candidate for further analysis and improvement by field type and CFD programs.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126718517","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}
Although a pragmatic approach towards achieving Semantic Web has gained some traction with Linked Data, there are still a lot of open problems in the area of Linked Data. Because Linked Data are modeled as RDF graphs, we cannot directly adopt existing solutions from database systems or Web technologies. This paper presents a hybrid method between the centralized approach and the distributed approach based on query processing to increase the join query performance. Using auxiliary indexes we can retrieve distributed data resources participating on a query result, rapidly reducing the amount of data that are really needed to be accessed on-demand. The performance of the proposed index structure is compared with some existing methods on a real RDF dataset. Our method outperforms the existing methods due to its ability to reduce a large amount of irrelevant resources.
{"title":"Hybrid Index Structure based on MBB Approximation for Linked Data","authors":"Yongju Lee, Yuxian Sun","doi":"10.1145/3177457.3177458","DOIUrl":"https://doi.org/10.1145/3177457.3177458","url":null,"abstract":"Although a pragmatic approach towards achieving Semantic Web has gained some traction with Linked Data, there are still a lot of open problems in the area of Linked Data. Because Linked Data are modeled as RDF graphs, we cannot directly adopt existing solutions from database systems or Web technologies. This paper presents a hybrid method between the centralized approach and the distributed approach based on query processing to increase the join query performance. Using auxiliary indexes we can retrieve distributed data resources participating on a query result, rapidly reducing the amount of data that are really needed to be accessed on-demand. The performance of the proposed index structure is compared with some existing methods on a real RDF dataset. Our method outperforms the existing methods due to its ability to reduce a large amount of irrelevant resources.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116061827","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}
VV&A (Verification, Validation & Accreditation) involves many types of jobs to achieve the credibility of a simulation system, which needs software tools to speed the process. SaaS (Software as a Service) can provide workflow-driven, programmable and extendable services in cloud to satisfy VV&A requirements. Based on this point, after proposing the services which are required in VV&A, the SOVA (Saas-Oriented VV&A Architecture) scheme and architecture are proposed, and a case study of PA-23 piloting simulation system is given, which describes a walkthrough of SOVA application.
{"title":"An Architecture for SaaS-Oriented VV&A","authors":"K. Fang, W. Tsai, Ming Yang","doi":"10.1145/3177457.3177486","DOIUrl":"https://doi.org/10.1145/3177457.3177486","url":null,"abstract":"VV&A (Verification, Validation & Accreditation) involves many types of jobs to achieve the credibility of a simulation system, which needs software tools to speed the process. SaaS (Software as a Service) can provide workflow-driven, programmable and extendable services in cloud to satisfy VV&A requirements. Based on this point, after proposing the services which are required in VV&A, the SOVA (Saas-Oriented VV&A Architecture) scheme and architecture are proposed, and a case study of PA-23 piloting simulation system is given, which describes a walkthrough of SOVA application.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122228315","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}
Nutthanon Sa-ngonsub, S. Visessri, P. Jarumaneeroj
Flow data are essential for hydrological study, planning, and management to prevent drought and flood in a region. In catchments where flow data are not recorded or of poor quality, hydrological indices could be an alternative for predicting flow in ungauged catchments. This study demonstrates the methodology for predicting flow in ungauged catchments through the case study of 37 sub-catchments of the upper Ping catchment in northwest Thailand from 2006-2014. The regression method was applied to investigate the relationship between three flow indices including runoff coefficient, base flow index, and 95th percentile of flow, and catchment properties. The prediction interval of the regression relationship was used to condition rainfall-runoff model parameters. The model performance was tested by NSE* and reliability. The 95th percentile of flow was found to be the most informative index to regionalize flow followed by RC. The BFI had least contribution to the prediction of flow with poor NSE* and large uncertainty. The 95th percentile of flow and RC generally worked well for small sub-catchments.
{"title":"A Development of a Prediction Model for Ungauged Catchment in the North of Thailand","authors":"Nutthanon Sa-ngonsub, S. Visessri, P. Jarumaneeroj","doi":"10.1145/3177457.3177499","DOIUrl":"https://doi.org/10.1145/3177457.3177499","url":null,"abstract":"Flow data are essential for hydrological study, planning, and management to prevent drought and flood in a region. In catchments where flow data are not recorded or of poor quality, hydrological indices could be an alternative for predicting flow in ungauged catchments. This study demonstrates the methodology for predicting flow in ungauged catchments through the case study of 37 sub-catchments of the upper Ping catchment in northwest Thailand from 2006-2014. The regression method was applied to investigate the relationship between three flow indices including runoff coefficient, base flow index, and 95th percentile of flow, and catchment properties. The prediction interval of the regression relationship was used to condition rainfall-runoff model parameters. The model performance was tested by NSE* and reliability. The 95th percentile of flow was found to be the most informative index to regionalize flow followed by RC. The BFI had least contribution to the prediction of flow with poor NSE* and large uncertainty. The 95th percentile of flow and RC generally worked well for small sub-catchments.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129604860","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}
Flight simulators play an important role in pilot training and education. They are used widely in aerospace industry and have diverse functionalities. However, there is no university that has a process of teaching and learning to build a full flight simulation. Flight simulation is a combination of mathematical, computer science, control theory, and mechatronics. The present study provides the basis of methodology that is used to build a flight dynamics model with entire flight envelope. The model consists of the interaction between the landing gear, wheels and ground. Some results of aircraft's response to some basic actuator deflections will be discussed and analyzed.
{"title":"Development of a Flight Dynamics Model for Fixed Wing Aircraft","authors":"N. Dat, Tran Ngoc Son, Duong Anh Tra","doi":"10.1145/3177457.3177470","DOIUrl":"https://doi.org/10.1145/3177457.3177470","url":null,"abstract":"Flight simulators play an important role in pilot training and education. They are used widely in aerospace industry and have diverse functionalities. However, there is no university that has a process of teaching and learning to build a full flight simulation. Flight simulation is a combination of mathematical, computer science, control theory, and mechatronics. The present study provides the basis of methodology that is used to build a flight dynamics model with entire flight envelope. The model consists of the interaction between the landing gear, wheels and ground. Some results of aircraft's response to some basic actuator deflections will be discussed and analyzed.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126387407","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}
Indoor air condition is paid attention by people because of its direct relation to human health. The Computational Fluid Dynamics (CFD) simulation is broadly used in architectural ventilating system design. Here, the commercial simulation software Ansys is used to predict the indoor airborne dust contribution. Based on a model of college students' dormitory, the CFD simulated air velocity distribution and air flow duct to predict the airborne dust distribution. Meanwhile, this study examined the dust concentration in the same room via the dust sensor. Integrating results from both the simulation and the dust sensor, we concluded the distribution of dust particles in the room. This study integrates the sensor network with simulation, allowing for computing the airborne dust distribution with a border range. In the future the system could predict a variety of airborne particles contributing to the air pollution by applying different sensors.
{"title":"An Indoor Airflow Simulation and Airborne Dust Concentration Analysis","authors":"Anyang Yu, Haonan Zhao, Changjiang Zhang, Yu Meng","doi":"10.1145/3177457.3177483","DOIUrl":"https://doi.org/10.1145/3177457.3177483","url":null,"abstract":"Indoor air condition is paid attention by people because of its direct relation to human health. The Computational Fluid Dynamics (CFD) simulation is broadly used in architectural ventilating system design. Here, the commercial simulation software Ansys is used to predict the indoor airborne dust contribution. Based on a model of college students' dormitory, the CFD simulated air velocity distribution and air flow duct to predict the airborne dust distribution. Meanwhile, this study examined the dust concentration in the same room via the dust sensor. Integrating results from both the simulation and the dust sensor, we concluded the distribution of dust particles in the room. This study integrates the sensor network with simulation, allowing for computing the airborne dust distribution with a border range. In the future the system could predict a variety of airborne particles contributing to the air pollution by applying different sensors.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121970549","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}
Drilling in bone is a common surgical procedure in orthopedics for fixation and reconstructive surgeries. Research in this area is largely focused on investigating alternate drilling techniques for minimal destruction to the bone tissue. This study measured temperature and force generated during conventional drilling (CD) and ultrasonically-assisted drilling (UAD) using Finite Element (FE) simulations. Three-dimensional FE model of bone drilling was developed and analyzed to simulate the dynamic processes involved in the process. Numerical simulation predicted lower drilling force and temperature in UAD compared to CD using controlled ultrasonic parameters (frequency -- 20kHz, amplitude = 10 micrometers). Drilling tests are performed on fresh bovine femur using surgical drills in the presence of ultrasonic vibrations imposed on the drill in the cutting direction. Force and temperature generation at various depths are calculated and compared for the prescribed drilling techniques. The results obtained from numerical simulations are compared with bone drilling experiments.
{"title":"Finite Element Modeling and Analysis of Ultrasonically-Assisted Drilling of Bone","authors":"K. Alam, Mushtaq H Khan, V. Silberschmidt","doi":"10.1145/3177457.3177500","DOIUrl":"https://doi.org/10.1145/3177457.3177500","url":null,"abstract":"Drilling in bone is a common surgical procedure in orthopedics for fixation and reconstructive surgeries. Research in this area is largely focused on investigating alternate drilling techniques for minimal destruction to the bone tissue. This study measured temperature and force generated during conventional drilling (CD) and ultrasonically-assisted drilling (UAD) using Finite Element (FE) simulations. Three-dimensional FE model of bone drilling was developed and analyzed to simulate the dynamic processes involved in the process. Numerical simulation predicted lower drilling force and temperature in UAD compared to CD using controlled ultrasonic parameters (frequency -- 20kHz, amplitude = 10 micrometers). Drilling tests are performed on fresh bovine femur using surgical drills in the presence of ultrasonic vibrations imposed on the drill in the cutting direction. Force and temperature generation at various depths are calculated and compared for the prescribed drilling techniques. The results obtained from numerical simulations are compared with bone drilling experiments.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132243416","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}
Zhangbo Duan, Hongliang Mao, Zhidong Chen, Xiaomin Bai, Kai Hu, J. Talpin
As a decentralized and distributed secure storage technology, the notion of blockchain is now widely used for electronic trading in finance, for issuing digital certificates, for copyrights management, and for many other security-critical applications. With applications in so many domains with high-assurance requirements, the formalization and verification of safety and security properties of blockchain becomes essential, and the aim of the present paper. We present the model-based formalization, simulation and verification of a blockchain protocol by using the SDL formalism of Telelogic Tau. We consider the hierarchical and modular SDL model of the blockchain protocol and exercise a methodology to formally simulate and verify it. This way, we show how to effectively increase the security and safety of blockchain in order to meet high assurance requirements demanded by its application domains. Our work also provides effective support for assessing different network consensus algorithms, which are key components in blockchain protocols, as well as on the topology of blockchain networks. In conclusion, our approach contributes to setting up a verification methodology for future blockchain standards in digital trading.
{"title":"Formal Modeling and Verification of Blockchain System","authors":"Zhangbo Duan, Hongliang Mao, Zhidong Chen, Xiaomin Bai, Kai Hu, J. Talpin","doi":"10.1145/3177457.3177485","DOIUrl":"https://doi.org/10.1145/3177457.3177485","url":null,"abstract":"As a decentralized and distributed secure storage technology, the notion of blockchain is now widely used for electronic trading in finance, for issuing digital certificates, for copyrights management, and for many other security-critical applications. With applications in so many domains with high-assurance requirements, the formalization and verification of safety and security properties of blockchain becomes essential, and the aim of the present paper. We present the model-based formalization, simulation and verification of a blockchain protocol by using the SDL formalism of Telelogic Tau. We consider the hierarchical and modular SDL model of the blockchain protocol and exercise a methodology to formally simulate and verify it. This way, we show how to effectively increase the security and safety of blockchain in order to meet high assurance requirements demanded by its application domains. Our work also provides effective support for assessing different network consensus algorithms, which are key components in blockchain protocols, as well as on the topology of blockchain networks. In conclusion, our approach contributes to setting up a verification methodology for future blockchain standards in digital trading.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127387434","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}
In this study, we develop forecast models for incoming calls at a call center of a commercial bank in Thailand. We found that incoming calls are non-stationary. Normally, the number of calls is low during holiday and high during the beginning and ending of each month. Various time series models are applied for monthly forecast and an algorithm based on seasonal pattern is proposed for daily forecast. MAPE (Mean Absolute Percentage Error) and RMSE (Root Mean Square Error) are used for comparing the proposed methodology and the current model that the bank uses. The results show that the proposed methodology is better than the current model. MAPE reduces from 9.79% to 8.12% and RMSE reduces from 960.37 to 861.88.
{"title":"Forecasting of Incoming Calls in a Commercial Bank Service Call Center","authors":"Sirithep Chanbunkaew, W. Tharmmaphornphilas","doi":"10.1145/3177457.3177498","DOIUrl":"https://doi.org/10.1145/3177457.3177498","url":null,"abstract":"In this study, we develop forecast models for incoming calls at a call center of a commercial bank in Thailand. We found that incoming calls are non-stationary. Normally, the number of calls is low during holiday and high during the beginning and ending of each month. Various time series models are applied for monthly forecast and an algorithm based on seasonal pattern is proposed for daily forecast. MAPE (Mean Absolute Percentage Error) and RMSE (Root Mean Square Error) are used for comparing the proposed methodology and the current model that the bank uses. The results show that the proposed methodology is better than the current model. MAPE reduces from 9.79% to 8.12% and RMSE reduces from 960.37 to 861.88.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127400637","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}
Xinyu Liang, Xiangzhou Chen, Huixia Ding, Geng Zhang, Ni Zhen
In order to reduce the operation risk of the network and improve the self-healing ability of the real-time wide area control system, this paper presents a link break analysis model of power communication network. This model is based on the research and optimization of multi-point fault self-healing technology about the light channel and combined with the recovery method of single point of failure. According to the definition of risk assessment and the automatic rerouting of basic mechanisms which is based on ASON, the corresponding rerouting triggering mechanism and optimization model is proposed. This measure effectively reduced the operational risk of the business, then further strengthened the robustness and stability of the real-time wide area secure control system that finally ensure the stable and reliable operation of the communication network and the power grid system.
{"title":"Research on Multi Point Self Healing Technology of Optical Channel Based on Wide Area Stability Control and Proposal of Reducing Business Risk Optimization Model","authors":"Xinyu Liang, Xiangzhou Chen, Huixia Ding, Geng Zhang, Ni Zhen","doi":"10.1145/3177457.3191712","DOIUrl":"https://doi.org/10.1145/3177457.3191712","url":null,"abstract":"In order to reduce the operation risk of the network and improve the self-healing ability of the real-time wide area control system, this paper presents a link break analysis model of power communication network. This model is based on the research and optimization of multi-point fault self-healing technology about the light channel and combined with the recovery method of single point of failure. According to the definition of risk assessment and the automatic rerouting of basic mechanisms which is based on ASON, the corresponding rerouting triggering mechanism and optimization model is proposed. This measure effectively reduced the operational risk of the business, then further strengthened the robustness and stability of the real-time wide area secure control system that finally ensure the stable and reliable operation of the communication network and the power grid system.","PeriodicalId":297531,"journal":{"name":"Proceedings of the 10th International Conference on Computer Modeling and Simulation","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127871037","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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