Residual stress has become more important than ever with the increasing performance requirement of components especially for those applied in safety-critical areas. As the machining process is fundamentally correlated with the acquired component properties, it is essential to fully understand the formation mechanism of residual stresses in the cutting process and its influence on the performance of

Recently, the number of electric-power facilities, including high-voltage direct current (HVDC) and flexible AC current transmission system (FACTS), has rapidly increased, owing to restrictions regarding the expansion of existing AC networks. Traditionally, a final site acceptance test (SAT) is conducted following controller performance verification in a factory acceptance test (FAT), based on an equivalent

Engineers and engine manufactures have known for years that piston rings account as the main source of the friction in internal combustion engines, as much as seventy-five percent in many cases. Excessive engine wear is also, very often caused by poor vehicle operation, and subsequent momentary poor lubrication. The paper presents a numerical methodology and results regarding the wear and deposition

The complexity of systems now under consideration (be they biological, physical, chemical, social, etc), together with the technicalities of experimentation in the real-world and the non-linear nature of system dynamics, means that computational modelling is indispensible in the pursuit of furthering our understanding of complex systems. Agent-based modelling and simulation is rapidly increasing in

The design of supply chain networks (SCNs) aims at determining the number, location, and capacity of production facilities, as well as the allocation of markets (customers) and suppliers to one or more of these facilities. This paper reviews the existing literature on the use of simulation-optimization methods in the design of resilient SCNs. From this review, we classify some of the many works in

Because of increasing demands in parcel transportation, it is becoming increasingly important for logistics distribution centers to save time and money while dealing with parcel sortation operations. The role played by facility and layout planning in logistic distribution centers has a great impact on the performance of parcel sortation. In this study, a simulation-optimization approach is adopted

Pedestrians will form groups in both normal and emergency sometimes. Members of these groups usually have certain social relations. We study emergency evacuation of pedestrians in a pediatric hospital in this paper. Pedestrians there have their own particularities. First of all, all patients are children. Secondly, the patients usually have no ability to see a doctor alone. They are always accompanied

Innovative interchange designs are gaining attention due to their potential in reducing delays and mitigating congestion. This study was aimed at proposing the super diverging diamond interchange (SDDI) as an alternative design to the conventional diamond interchange (CDI), diverging diamond interchange (DDI), diverging partial cloverleaf interchange (DPCI), folded diamond interchange (FDI) and ramp

Theatre is an actor-based system currently implemented in Java, which enables modelling, analysis and implementation of predictable time-dependent distributed systems like cyber-physical systems. Theatre, though, can also be used for untimed complex systems. The core feature of Theatre is its control-based character. A reflective control layer, which can be tailored to the needs of specific application

Boarding behavior on the platform of high-speed railway (HSR) station, as a critical problem that has not been fully explored and understood, is investigated in this paper. An extended cellular automaton (CA) model is proposed to study the impacts of passengers’ heterogeneities during the boarding process. Some numerical tests are conducted to explore the passengers’ movements and the complex traffic

The continuous enhancement of X-in-the-Loop (XiL) simulation methods is one key to efficiently test advanced vehicle control functions and ensure high software quality under a rising cost and time pressure. Systems, which control vehicles based on sensor perception can already be evaluated in XiL simulations. However, future vehicles will not exclusively represent stand-alone systems anymore, but involve

There is an increasing interest in using microsimulation models for traffic safety evaluations and several calibration procedures were proposed for the simulation models to obtain a high correlation between the simulated and field-measured conflicts. However, since the ultimate goal of safety studies is to reduce crashes, the simulation model needs to be calibrated to ensure an accurate prediction

This study examined the transition from Traditional Vehicles (TVs) to Autonomous Vehicles (AVs) using microsimulation modelling approaches. For this purpose, the study first optimised the parameters of human driving behaviours to find out what would happen if AVs could drive with modified human behaviours. Then, the study acquired the optimised driving behaviours to evaluate how efficient AVs can be

The use of battery power is becoming widespread rapidly among the mega ports worldwide, owing its low emission and high energy efficiency. In this paper, a simulation approach is presented to configure the charging stations (CSs) and battery-powered automated guided vehicles (B-AGVs) at automated container terminals. The facility planning of the CSs and the operation strategies of the B-AGVs are crucial

The capacity of unsignalized intersections is a significant value that indicates traffic conditions as well as network performance at urban and rural roads. These intersections are the most numerous on the road network. Inaccurate determination of unsignalized intersections capacity can give a misconception of the traffic conditions on the network. Researches about unsignalized intersections are mostly

The interest in large scale automated video surveillance systems and the interest in using cloud in supporting such systems has increased dramatically. Unfortunately, building such a large system requires huge resources (for processing and storage) and very high network bandwidth. This paper, proposes a framework for resources efficient intelligent automated surveillance framework that utilizes edge

Durability of the vehicle components needs special attention in the design step due to this fact that the loads on a vehicle are dynamic by their nature. Also, fatigue resistance of the vehicle body is quite important as it is the main load-bearing component among others. The main purpose of the present research is to simulate the spot weld failures of the vehicle body structure due to fatigue damage

Android currently represents the most widespread operating system focused on mobile devices. It is not surprising that the majority of malware is created to perpetrate attacks targeting mobile devices equipped with this operating systems. In the mobile malware landscape, there exists a plethora of malware families exhibiting different malicious behaviors. One of the recent threat in this landscape

The reliable assessment of the stability of saturated slopes becomes a challenging task when slopes are consisting of discontinuous materials and containing pre-existing joints. The discontinuous nature of the slopes’ material could increase the overall permeability of the slope, while existing joints facilitate groundwater leakage through the joint surfaces into the slope which subsequently exerts

Technical Question & Answering (Q&A) websites have become promising sources of information for a wide range of topics and the most popular is Stack Overflow. Aiming to attract the continuous users’ interest, Stack Overflow enabled the gamification system. By rewarding users’ participation and contribution to the community, the site provides motivation to increase their participation. A well-known gamification

In this paper, the idea of solving algebraic equations (AEs) through the fixed-point iterative method (FPIM) is generalized for the differential algebraic equations (DAEs) of power systems in order to analyze transient stability problems, which are particularly relevant when the number of DAEs in high-order models increase. In the loop form, reducing the number of variables by explicitly solving AEs

Continuous and discrete event simulations are often applied to study the behavior of systems with continuous and discrete flow, respectively. However, in real-life scenarios, both continuous and discrete flows can be observed within the same system. In such cases, discretization of a continuous flow system can allow modeling the system using discrete event simulation (DES) techniques. This paper presents

Microscopic traffic simulators have become efficient tools to conduct different analytic studies on roads, vehicles, behavior of drivers, and critical intersections, which lead towards a well-planned traffic solution. Devising a realistic and sustainable traffic solution requires replication of the real traffic scenario in a simulator. For example, to simulate the traffic stream of less developed countries

When feeding a constant-resistance or constant-voltage type load, inductive wireless power transfer link (IWPTL) operating as current source is typically desired. Moreover, in case coupling coefficient between transmitter and receiver is constant, load-independent current output (LICO) characteristics are beneficial, allowing the system to operate without feedback. Moreover, near zero phase angle (ZPA)

Many applications in intelligent transportation systems are demanding an accurate vehicle Global Position System (GPS) location prediction. In this study, we satisfy this demand by designing an automated GPS location prediction system based on the well known traditional Auto-Regressive Integrated Moving Average (ARIMA). To increase the proposed model accuracy, make it dynamic, and reduce its execution

In this study, it was aimed to improve the cutting performance of the cutting tool (drill) used in drilling which is of great importance in the industry. The study includes experimental determination of thrust force and torque occurred during drilling, and analysis of the effects of these cutting loads on cutting tool with the Deform-3D program based on finite element method (FEM). For this purpose

Transient vibration analyses of structures with complex shapes are performed by finite element (FE) methods. Transient vibration analyses take long processing times for the systems having large number of degrees of freedom. A method performing the transient analyses very fast using the Fast Fourier Transform (FFT) is introduced in this work, and it is applied to a curved manipulator. Various analyses

Nowadays, cloud computing is an emerging technology due to virtualization and providing low price services on pay-as per-use basis. One of the main challenges in this regard is how to evaluate different models of the cloud resources usage and the ability of cloud systems based on QoS constraints. Experimentation in a real environment is very difficult and expensive. Therefore, many works pay much attention

Human resources management (HRM) is the strategic approach of managing people in organizations. HRM can be naturally represented as a complex system of autonomous human agents, whose interactions are influenced by mutually reinforcing HRM strategies, policies, and practices. Stochastic and dynamic human interactions could lead to emergent phenomena of organizational performance in the long-term. Therefore

The purpose of this paper is to show how the knowledge of Process Mining techniques can provide a robust premise to build a Discrete Event Simulation (DES) model of a healthcare process. In order to analyze some specific processes of an ophthalmology ward of a large Italian hospital, ProM6 framework was implemented, which supports process mining techniques in form of plug-ins; the plug-ins process

Human stampedes have been identified as a major hazard that could occur during pedestrian evacuations around the world. This paper establishes an extended floor field model to study the pedestrian evacuation dynamics during stampedes. The event floor field and a tumble factor are elaborated to describe the influence of stampedes. Different evacuation strategies are proposed to represent the behavioral

Rock machining has been widely used in many industries. In order to better understand the fracture and removal mechanism for rock materials during abrasive machining, a two-dimensional scratch model was developed using the hybrid finite-discrete element method (FDEM). The crack propagation during the abrasive machining process was simulated by inserting zero-thickness cohesive elements. Based on the

The present research study was aimed at studying the impact of machining parameters on grain size alterations in machining of Ti6Al4V alloy using finite element analysis (FEA) based on the Johnson-Mehl-Avrami-Kolmogorov (JMAK) recrystallization model. The machining parameters consisted of both cutting conditions and tool geometry including cutting speed, feed rate, tool edge radius and rake angle.

Manufacturing companies need to be effective in meeting customers’ delivery requirements. Due to customers’ expectations of shrinking delivery times, manufacturing lead times need to be short. This can be achieved through efficient Production Activity Control (PAC) methods. Currently PAC methods rely mostly on centralized decision-making and, seeming not to be adequate to deal with the increasing complexity

The attack surface of a modern vehicle increases with its connectivity. A strategy to prevent attacks or at least to identify such attacks and to mitigate their effects is therefore imperative. The detection of indications for intrusive behavior in an in-vehicle network is an important aspect of a holistic security concept. The structure of the payload of in-vehicle messages with respect to the encoded

To this day, sales & operations planning (S&OP) remains one of the most critical challenges of supply chain management in terms of improving customers’ experience level and managing supply chain costs. Nowadays the synchronization of sales essentials and industrial restrictions in an uncertain environment is critical for all global companies facing complexity in supply chain networks and operations

Traffic flow modeling has evolved over a few decades with numerous models at the macroscopic and microscopic levels being proposed. It appears that traffic flow modeling has been adequately addressed and it is natural to ask if there is still any gap to fill or any room to improve. After examining existing models and comparing them against ideal outcomes, we identified four limitations in both traffic

Modeling and persistence of different data structures in indoor positioning systems is a requirement for providing a large number of specialized location-based services. Collection and diversification of indoor positioning systems’ metadata are important to understand the context of the system’s operation to create a positive feedback improvement loop. While metadata from a residential building’s indoor

This paper tries to display complete thermo-hydrodynamic research in journal bearings, investigating the growing pressure and temperature rise inside the bearing during operation. The narrow and infinitely long bearings are extensively investigated including analytical solutions either for plain journal bearing, or journal bearing with an axial groove. In narrow bearing approximation, the temperature

Double cycling is used to improve the efficiency of quay cranes (QCs). However, higher QCs utilization increases the highest observed peak power demand of QCs, leading to a higher energy-related costs. Thus, this paper investigates the opportunities for peak shaving the power demand of QCs with double cycling by limiting the number of lifting QCs or the maximal energy demands of QCs. And some evaluation

This paper presents a processing model for big IoT data. The model includes a continuous delivery scheme based on building blocks for constructing software pipelines from the edge to the cloud. It also includes a data preparation scheme based on parallel patterns for establishing, in an efficient manner, controls over the production and consumption of IoT data. This scheme adds data properties such

The design and control of robotic shooting control systems in defense systems is one of the important research topics in recent years. This study focuses on the design, modeling, and success of the shooting control system of the 14 Degrees of Freedom (DoF) Four Legged Hunter Robot (FLH) system with 2 DoFs gun barrel systems. The three-dimensional dynamic model of the FLH-Robot with gun barrel system

Cloud computing is being rapidly adopted for managing IT services as a notable solution due to diverse beneficiaries such as automatically optimized resource management as well as modern service delivery models. The container as a service has been recently introduced by cloud providers as a new service apart from traditional cloud services. Containers enable applications to run and deploy on isolated

Numerical simulation of limestone rock mass blasting was carried out using the two-dimensional particle flow code (PFC2D) within the discrete element modeling framework, and the explosion load was loaded using the particle expansion algorithm. A field experiment of rock blasting was also carried out from which the size of the blasting funnel and the maximum blasting vibration velocity were recorded

The agent-based modeling and simulation (ABMS) paradigm has been used to analyze, reproduce, and predict phenomena related to many application areas. Although there are many agent-based platforms that support simulation development, they rely on programming languages that require extensive programming knowledge. Model-driven development (MDD) has been explored to facilitate simulation modeling, by

The pervasive integration of ‘things‘ in the Internet of Things together with state-of-the-art computer systems provide a stimulating environment for creativity and business opportunities, but also a large range of security challenges. Engineering the security of such systems must acknowledge the peculiar conditions under which such systems operate: low computational capacity, distributed decision-making

In this paper, we propose a scheme which aims at determining and forecasting sampling rate of active biosensors in Wireless Body Area Networks (WBANs). In this regard, from the first round until a certain round, the sampling rate of biosensors would be determined. Accordingly, we introduce our modified Fisher test, develop Spline interpolation method, introduce three main parameters namely information

Advances in technology and the rise of new computing paradigms, such as Fog computing, may boost the definition of a new generation of advanced support services in critical applications. In this paper we explore the possibilities of a Wireless Sensor Network support (WSN) for a Fog computing system in an emergency management architecture that has been previously presented. Disposable intelligent wireless

In automated warehouses, multiple automated guided vehicles (AGVs) are widely used to sort parcels for improving storage efficiency. However, as the number of AGVs increases, the scheduling complexity also increases dramatically. This paper proposes a hierarchical planning algorithm for efficiently coordinating a fleet of AGVs in warehouses based on global vision. We use the camera installed on the

Log yards store huge volumes of roundwood to provide raw material for the production process at sawmills. In order to achieve that, considerable transport efforts, usually done by wheel loaders and log stackers, are required. The automation of a log yard using automated storage components (ASCs) might be a promising way to simplify log yard processes and reduce costs. To address the related automated

The reliable and optimised design of a drainage system for saturated slopes is often a challenging geotechnical task. Such a task becomes even more challenging when a slope contains pre-existing joints and discontinuities. In saturated and semi-saturated conditions, the existence of joints may lead to a complex distribution of pore water pressure within the slope, affecting the effective stress distribution

In order to optimize the process parameters of high residual stress on the surface of Ti-6Al-4V alloy sheet which is obtained after ultrasonic rolling, the effects of static pressure, ultrasonic rolling amplitude and time on surface residual stress are investigated. Firstly, the ultrasonic rolling experiment was carried out under different static pressure conditions, and then the distribution of residual

Cloud service selection process is significantly challenging and complicated as there are various QoS factors to consider when selecting cloud services. This paper proposes a new QoS-aware selection model systematically and succinctly representing QoS attributes which cloud consumers can easily use and understand when selecting cloud services. In order to ensure the credibility of the cloud service

One of the most challenging problems in the field of machining is to determine the onset of shear localization. The consequences of the emergence of shear localized chips are fluctuations in the machining forces, tool wear, deterioration of the surface quality and out-of-tolerance machined components. Several constitutive material models are developed for the simulation of shear localization during

System entity structure has been used since the 1970s as a formal ontology framework, axiomatically defined, to represent the elements of a system of systems and their hierarchical relationships resulting in a family of hierarchical models. One challenge with this approach is the process of exploring a family of hierarchical models, and selecting a particular composition from which a fit-for-purpose

Subsea observation networks have been increasingly used to explore oceans. However, the stability of the entire system remains a crucial problem. In 2015, flashover discharge occurred in a transmission line during a sea trial in the South China Sea, thereby resulting in node destruction and serious losses. This study investigates flashover discharge in the transmission line and aims to determine its

In-pit crushing and conveying (IPCC) systems (whether fixed, mobile, or semi-mobile) are an alternative to the traditional truck/shovel approach to materials handling, offering potential cost savings. However, assessing the viability of one of these systems for an existing or planned open-pit mine from an operational standpoint presents a great deal of challenge given the complexity of the problem

This paper presents a generic methodology for fault forecasting or prognosis in industrial equipment. Particularly, this technique regards training some unsupervised machine learning model using high amount of historical process data from such equipment as input and stop data as reference. The goal is to correlate as strongly as possible the anomalies found by the model in the process data with upcoming

Cloud computing has become a promising solution for scientific workflow applications, due to its various assets. Workflow scheduling is a well-known NP-complete problem, so difficult to solve since there are no optimal solutions. Several workflow scheduling works aim at optimizing the makespan and the budget. However, more investigations are needed for appropriate resources chosing in the large set