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An automatic modeling method, which creates an inference engine out of raw data, is suggested. The inference engine is used by the automation system to assist operators in decision making. We aim at plant-wide modeling of industrial processes and we therefore prioritize fast and approximate solutions. The suggested method is capable of creating models with hundreds of variables. As a basic structure...
Deadlock states are undesirable situations in any system,. Their avoiding presents a major issue in control of resource allocation systems (RAS), a theoretical paradigm, used in construction of e.g. flexible manufacturing systems. In coordinating RAS with processes containing concurrent execution in their development, it has been proved, that deadlock avoidance policies developed, for sequential RAS...
Industrial control systems are continuously increasing in functionality, connectivity, and levels of integration, and as a consequence they require more computational power. At the same time, these systems have specific requirements related to cost, reliability, timeliness, and thermal power dissipation, which put restrictions on the hardware and software used. Today the high-end embedded CPUs not...
This paper addresses a key objective of the supply chain strategic design, i.e., the optimal selection of suppliers under uncertainty. A methodology integrating the cross-efficiency Data Envelopment Analysis and the Monte Carlo approach is proposed. Their combination allows overcoming the deterministic feature of the classical cross-efficiency DEA. Moreover, we define an indicator of the robustness...
Much of the research on security of industrial automation systems has focused on countermeasures such as intrusion detection, certificate management or public key infrastructures. Due to limited resources, countermeasures should be focused to prevent the attacks with highest potential for damage. The impact of an attack can only be determined through a detailed analysis of the interactions of the...
In this paper it is described the prototyping of an instrumented chair that allows to fully-automate the “Timed Up and Go”, the “30-Second Chair Stand” and the “Hand-Force ” tests assessment. The presented functional chair prototype is a low cost approach that uses inexpensive sensors and the Arduino platform as the data acquisition board, with its software developed in LabVIEW. The “Timed up and...
This paper approaches the deadlock prevention problem for the well known class of S3PR used in Resource Allocation Systems. The proposed control policy is based on inhibitor arcs and the new Petri net class will be called S3PR2. The liveness characterization of this new class is given. The main application of the approach is to robot motion for a team of robots evolving in a partitioned environment...
The growth of the manufacturing sector is closely linked to the development of new technologies, specifically automation and robotics. However, the lack of flexibility in industrial robotics and its design oriented to large series, results in that is economically unviable for small and medium sized business due to the need for complex positioning tools and highly skilled robotic operators. Robot work...
Emergency department crowding is a significant international problem. The problem is on the edge of the emergency department and the departments where the patients will be subsequently admitted, provided they are not discharged. In this paper we present an analysis of the factors affecting waiting time in the emergency department of an eminent hospital in Israel as well as a suggested solution utilizing...
This paper presents a modeling methodology for clinical guidelines used in hospitals. The clinical guidelines are assumed to be given in a graphical form in a structure obtained by combining few elements. It is shown how the clinical guidelines represented with this syntax can be automatically converted into a mathematical model represented as Petri nets. The main advantage of the new model is the...
The purpose of this paper is twofold: to depict the patient's journey in operating block of the hospital and to provide a flexible model that matches the reality. In operating block of Jeanne de Flandres Hospital, a daily meeting is held in order to establish the operations that will occur the next day. Organizing a schedule in these circumstances leads to a loss of time and can often lead to conflictual...
The disparity of Petri net models in the literature for the study of resource allocation problems in Flexible Manufacturing Systems (FMSs) is overwhelming. Paradoxically, those models often strongly overlap in terms of their modeling capability. Such clustering seems to be impelled by a mature knowledge of results which capsize liveness at the topological level of the FMS for families of models which...
We propose a model-driven approach for designing Wireless Sensor Network (WSN) applications, specifically for systems where hard real-time requirements must be satisfied. Traditionally, developing such systems presents difficulties in ensuring time and timing accuracy due to unpredictable computation time, ambiguities in program concurrency, and behavioural inconsistency between model and implementation...
Production systems are typically long-living, interdisciplinary systems which undergo continuous evolution. However, especially in the industry of the production automation, any formalized documentation of evolutionary changes is often neither created nor adapted to the application. Accordingly, no knowledge artefacts exist that can be automatically processed in order to support the evolution process...
The usage of visual analytics during the analysis of business warehouse calculated key performance indicators is one emerging challenge in modern business applications. On the one hand, a complex network of key performance indicators has to be supervised. On the other hand, within this network only few key performance indicators change obviously within a short period of time. The sole mapping of the...
In industrial automation, unexpected failures often generate high direct and indirect costs. To achieve high availability, the critical parts of the system are typically redundant. M-out-of-N (MooN) redundancy is a widespread redundancy pattern because it offers low failover times. This pattern has however two major disadvantages. First, the voter, an essential entity in MooN patterns, is itself a...
This paper presents a feasibility study of implementing parts of a distributed function block application as TinyOS modules running on Wireless Sensors as a part of Wireless Sensor Network. The paper first briefly describes underlying technologies and gives motivation for implementation of function blocks in TinyOS. The paper then presents implementation details about TinyOS realization of the one...
One of the most important requirements for the industrial networks, apart from the real-time capability, is the reliability. There are several methods that can be used to increase the communication reliability. One of them is data duplication, which is afterwards transmitted using two different (disjoint) paths. Since, such path search for time triggered Ethernet based systems is typically done during...
Vision-based hand gesture recognition relies on the extraction of features describing the hand, and the appropriate set of features is usually selected in an empirical manner. We propose in this article a systematic selection of the best features to be considered. An iterative sequential forward feature selection (SFS) approach is proposed to combine the features with the highest recognition rate...
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