International journal of engineering. Transactions A: basics最新文献

{"title":"Enhanced Predictions of Tides and Surges through Data Assimilation (TECHNICAL NOTE)","authors":"R. Karri, V. Babovic","doi":"10.5829/idosi.ije.2017.30.01a.04","DOIUrl":"https://doi.org/10.5829/idosi.ije.2017.30.01a.04","url":null,"abstract":"The regional waters in Singapore Strait are characterized by complex hydrodynamic phenomena as a result of the combined effect of three large water bodies viz. the South China Sea, the Andaman Sea, and the Java Sea. This leads to anomalies in water levels and generates residual currents. Numerical hydrodynamic models are generally used for predicting water levels in the ocean and seas. But their correctness is typically limited by several factors, namely the complexity associated with the coastal geometry and uncertainty in the flow forcing factors like (winds, pressure and deep ocean tides). Modeling of ocean dynamics in the Malacca strait and Singapore regional waters is particularly challenging due to the presence of large number of smaller islands and strongly nonlinear tidal interactions. The complexity is further enhanced due to the composite local bathymetry and geometry variations around the Singapore Island and  meteorological effects on different scales. This study acknowledges the enhancement and better prediction of tides and surges through the use of data assimilation. Through a portable interface OpenDA, an ensemble Kalman filter is integrated with a hydrodynamic model to enhance the model predictions. To assess the sensitivity and evaluate model enhancement, a twin experiment is designed to improve tidal boundary forcing effect in a semi-enclosed estuary. The key outcomes of this study signify that the model results can be significantly improved in this complex flow regime.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129454214","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}

{"title":"Risk Analysis of Operating Room Using the Fuzzy Bayesian Network Model","authors":"B. Zoullouti, M. Amghar, N. Sbiti","doi":"10.5829/idosi.ije.2017.30.01a.09","DOIUrl":"https://doi.org/10.5829/idosi.ije.2017.30.01a.09","url":null,"abstract":"To enhance Patient’s safety, we need effective methods for risk management. This work aims to propose an integrated approach to risk management for a hospital system. To improve patient’s safety, we should develop flexible methods where different aspects of risk and type of information are taken into consideration. This paper proposes a fuzzy Bayesian network to model and analyze risk in the operating room. Bayesian networks provide a framework for presenting causal relationships and enable probabilistic inference among a set of variables. Fuzzy logic allows using the expert’s opinions when quantitative data are lacking and only qualitative or vague statements can be made. This approach provides an actionable model that accurately supports human cognition using linguistic variables. A case study of the patient’s safety risk is used to illustrate the application of the proposed method.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129362477","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}

{"title":"Experimental Analysis of Heat Transfer and Friction Factor in Plate Heat Exchanger with Different Orientations Using Al2O3 Nanofluids","authors":"Prashant, Gurpreet Singh, T. Sarao","doi":"10.5829/idosi.ije.2016.29.10a.16","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.16","url":null,"abstract":"Experimental investigations have been done to find out the heat transfer characteristics and friction factor of water based Al2O3 nanofluids as a coolant in brazed plate heat exchangers. In most of the studies plate heat exchangers are used in horizontal or vertical conditions. The base plate of the plate heat exchanger was kept inclined at (0, 30, 60, 90). The experimentation has been carried out with two different concentration of the nanofluids (0.1 and 0.2 v/v%). It was observed that the heat transfer characteristics improves with an increase in Reynolds number. It has been shown that nanofluids in a plate heat exchanger have a maximum of 34% heat transfer rate over the base fluid. It has been observed that from horizontal to vertical orientation heat transfer rate decreases with increase in Reynolds number. The average heat transfer coefficient has been found to reduce by 10-15% when the angle of inclination of base plate of heat exchanger i from horizontal is 30. doi: 10.5829/idosi.ije.2016.29.10a.16","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115342504","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}

{"title":"Control Simulation and Experimental Verification of Maximum Power Point Tracking Based on RT-LAB (TECHNICAL NOTE)","authors":"B. Haihong, Z. Weiping, C. Bing","doi":"10.5829/idosi.ije.2016.29.10a.07","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.07","url":null,"abstract":"The maximum power point tracking (MPPT) control in a Photovoltaic system is the key control technology, however present controllers have the disadvantages of long development cycle, high cost and complex verification, and there are some disadvantages carrying out totally physical simulation or totally digital simulation of different control algorithms. This paper carried out design of hardware controller by researching different kinds of MPPT algorithms together with the improved MPPT algorithm, then digital-analog hybrid real-time simulation was carried out based on the digital main circuit using RT-LAB developed by Opal-RT company. Effectiveness and superiority of the improved MPPT algorithm were verified in comparison with control effects of the improved MPPT algorithm and control effects of traditional MPPT algorithms. doi: 10.5829/idosi.ije.2016.29.10a.07","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"431 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132563502","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}

{"title":"Numerical Study of Interaction of Two Plane Parallel Jets","authors":"N. Hnaien, S. Khairallah, H. B. Aissia, J. Jay","doi":"10.5829/idosi.ije.2016.29.10a.13","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.13","url":null,"abstract":"","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121440344","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}

{"title":"Investigation of Generic House Components and Their Practical Ways to Be Assessed by House Buyers During Defect Liability Period in Malaysia","authors":"Norfarahayu Kariya, Z. Yaakob, M. Sairi, H. Mohammad, S. K. Yaman, N. Abas","doi":"10.5829/idosi.ije.2016.29.10a.05","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.05","url":null,"abstract":"The newly built residential house basically had undergone a period where any defects toward the house will be rectified by the particular developer. Defect Liability Period (DLP) which commenced from the day of Vacant Possession (VP) by house owners generally in effect between eighteen (18) months and twenty four (24) months. During DLP, new house owner have the right to issue any complaints regarding the quality of the said building. Unfortunately, complaints were believed to widespread in the recent era where profitability is the main concerned for most of the developers. Since the quality of the finished product is of minor consideration, added with less knowledgeable new house owners on issues of house defect, the situation is going from bad to almost heedless. To add salt to the wound, scarcity on research and dissemination of knowledge were deemed to shut the issue until almost no existence. Therefore, the research is taking a leap by focusing on sense perceptions house components that received recurring complaints and provides corresponding practical ways to check for defects on behalf of new house owners. A mixed method of methodology has been imposed, starting with literature analysis, questionnaire survey, and structured interview, respectively. Questionnaire surveys were conducted using online distribution towards developers and contractors within southern states, namely; Johor, Melaka, and Negeri Sembilan. Meanwhile, the latter method was accomplished by interviewing several senior construction practitioners. In order to ease the analysis processes, SPSS, and NVivo were used as main software. Finally, the findings suggest that, sense perceptions, house components consist of several important parts such as roof, walls, and floors, along with their sub-components. However, not all components received similar trend of complaints from the house buyers. Further, interestingly, most of the senior construction practitioners proposed several unique and unaware practical ways for defect identification, such as by using torch light, water, and other simple testing methods. Last but certainly not least, the research embarks on application-based software as knowledge management and distribution effort, which is anchored on Android by Google Incorporation.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132607610","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}

{"title":"Radio Frequency-micro Electromechanical System Switch with High Speed and Low Actuated Voltage","authors":"B. Ganji, J. Yaghoubi","doi":"10.5829/idosi.ije.2016.29.10a.08","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.08","url":null,"abstract":"This paper presents a novel Radio Frequency-Micro Electromechanical System (RF-MEMS) fixedfixed switch for very fast switching. Using the obtained equations, the switching time depends on the stiffness and effective mass of the switch beam so that the switching time will be decreased by higher stiffness (spring constant) and lower effective mass. In the new design, the suspension bridge is a three-layer beam so that the middle layer is aluminum and outer layers are alumina. The reduced dimensions and three layers of beam cause to increase stiffness and reduce the mass of the beam. This led to increase the resonant frequency and as a result, the switching time is reduced. The results show that, the switching time is 127 ns for the applied voltage of 27V and also the pull-in voltage is 18V. The return loss is 12 dB at the frequency of 60 GHz that is desirable and the achieved results is better than previous works. Therefore, this switch is suitable for high frequency applications. doi: 10.5829/idosi.ije.2016.29.10a.08","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115536341","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}

{"title":"New Analytic Method for Subgrade Settlement Calculation of the New Cement Fly-ash Grave Pile-slab Structure","authors":"Ding-bang Zhang, Yi Zhang, T. Cheng, J. Yuan","doi":"10.5829/idosi.ije.2016.29.10a.06","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.06","url":null,"abstract":"At present, reducing subgrade settlement of soft soil foundation is a key problem in high-speed railway construction. Pile-slab structure is a widely-utilized form of foundation structure to reduce the subgrade settlement in China. In order to save the engineering cost for high-speed railway construction in developing countries, the author developed a pile-slab structure and named it as the new CFG pile-slab structure. This work analyzed the settlement controlling effect of new CFG pile-slab structure and summarized two calculation methods on its subgrade settlement which are further formulated into an analytic method. Three methods were used to calculate the subgrade settlement of CFG pile-slab structure for a soft soil foundation in Chinese Shanghai-chengdu high-speed railway. The research showed that: (1)The settlement controlling effect of CFG pile-slab structure can satisfy the requirement of high-speed railway construction. (2) The new analytic method is proved to be more accurate and can reflect the mechanism of load transferring．Furthermore，the new analytic method can provide theoretical guidances for engineering designs and constructions of the CFG pile-slab structure．","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127265486","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}

{"title":"A Hybrid Dynamic Programming for Inventory Routing Problem in Collaborative Reverse Supply Chains","authors":"M. Moubed, Y. Y. Mehrjerdi","doi":"10.5829/idosi.ije.2016.29.10a.12","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.12","url":null,"abstract":"Inventory routing problems arise as simultaneous decisions in inventory and routing optimization. In the present study, vendor managed inventory is proposed as a collaborative model for reverse supply chains and the optimization problem is modeled in terms of an inventory routing problem. The studied reverse supply chains include several return generators and recovery centers and one collection center. Since the mathematical model is an NP-hard one, finding the exact solution is time consuming and complex. A hybrid heuristic model combining dynamic programming, ant colony optimization and tabu search has been proposed to solve the problem. To confirm the performance of proposed model, solutions are compared with three previous researches. The comparison reveals that the method can significantly decrease costs and solution times. To determine the ant colony parameters, four factors and three levels are selected and the optimized values of parameters are defined by design of experiments.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"306 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114278314","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}

{"title":"The Reliable Hierarchical Location-allocation Model under Heterogeneous Probabilistic Disruptions","authors":"N. Zarrinpoor, M. S. Nezhad, M. Pishvaei","doi":"10.5829/idosi.ije.2016.29.10a.11","DOIUrl":"https://doi.org/10.5829/idosi.ije.2016.29.10a.11","url":null,"abstract":"This paper presents a novel reliable hierarchical location-allocation model where facilities are subject to the risk of disruptions. Based on the relationship between various levels of system, a multi-level multi-flow hierarchy is considered. The heterogeneous probabilistic disruptions are investigated in which the constructed facilities have different site-dependent and independent failure rates. In the occurrence of facility disruptions, to achieve system reliability, the mitigation operation is considered in such a way as to reassign the demand nodes to other operational facilities that can provide services. The problem is modeled from both cost and risk perspectives such that the fixed installation cost as well as the expected costs in normal disruption-free and disruptive conditions are minimized. A Benders decomposition algorithm is developed which seeks to find exact solution of the proposed model. Two efficient accelerating techniques including valid inequalities and knapsack inequalities are also proposed to expedite the convergence of solution procedure. The numerical results illustrate the applicability of the proposed model as well as the efficiency of the designed solution procedure.","PeriodicalId":416886,"journal":{"name":"International journal of engineering. Transactions A: basics","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114201886","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}