Search results for " Opera"
showing 10 items of 3606 documents
A beam search algorithm for minimizing crane times in premarshalling problems
2022
The premarshalling problem consists of sorting the containers placed in a bay of the container yard so that they can be retrieved in the order in which they will be required. We study the premarshalling problem with crane time minimization objective and develop a beam search algorithm, with some new elements adapted to the characteristics of the problem, to solve it. We propose various evaluation criteria, depending on the type of container movement, for its local evaluation; a new heuristic algorithm including local search for blue its global evaluation; and several new dominance rules. The computational study shows the contribution of each new element. The performance of the complete algo…
Zasady finansowania współpracy euroregionalnej na przykładzie Euroregionu Silesia
2016
The tasks of the Euroregion Silesia in the pre-accession program Phare CBC were different on both sides of the border and were limited contem- porary rules that force countries not belonging to the community of the EU. After the entry of both countries to the EU and the incorporation of the program INTERREG III A, the activities of the Euroregion as the so-called. Fund Manager of the Micro sometimes codified and today authorities of both parts Euroregion perform tasks in close cooperation with each other. With the Fund may be funded projects in the field of culture, sports, education, education, tourism, the environment, eco- nomic development planning, use of information technologies and o…
Use of Battery- vs. Petrol-Powered Chainsaws in Forestry: Comparing Performances on Cutting Time
2022
The use of battery tools is very common in many fields of work. In fact, the electric engine and batteries have several advantages over traditional endothermic engines, including low emissions, in terms of pollutants, vibration and noise. In this context, the chainsaw market started producing electric models powered by batteries. These machines can be useful in forestry, but information on their performance is scarce. The aim of this work was to compare the performance, in terms of cutting times, of three Stihl chainsaw models: the MS 220C-B (battery powered), and the MS 201 C-M and MS 261 C-M (both petrol powered). The study was carried out on five different wood species, also taking into …
Developing Cybersecurity in an Industrial Environment by Using a Testbed Environment
2023
Critical infrastructure protection requires a testing environment that allows the testing of different kinds of equipment, software, networks, and tools to develop vital functions of the critical industrial environment. Used electrical equipment must be reliable, capable and maintain a stable critical industrial ecosystem. An industrial business needs to develop cybersecurity capabilities that detect and prevent IT/ICT and OT/ICS threats in an industrial environment. The emerging trend has been to create security operations center (SOC) services to detect ICS-related threats in enterprise networks. The energy supply sector must consist of crucial elements for safe business continuity and su…
Unravelling the rationalities of childhood cycling promotion
2022
Decrease of children’s independent mobility (CIM) has worried academics, policymakers, educators and other professionals for decades. Research and policy often emphasise that promoting children’s physically active and independent transport modes as cycling is important to achieve better public health, solve environmental challenges and increase related economic benefits. Yet, cycling promotion is not a neutral process and all promotion efforts are derived from latent notions of ‘cyclists’ and ‘cycling’. This paper discusses different rationalities of childhood cycling promotion and the representations of ‘children’ as independent ‘cyclists’ they entail. We argue that in order to efficiently…
Fiziskā slodze metināšanas operātoriem SIA TS Rīga un preventīvie pasākumi
2018
Fiziskā slodze metināšanas operātoriem SIA TS Rīga un preventīvie pasākumi. Darba autors: Edgars Tauteris. Darba zinātniskais vadītājs: asociētais profesors, Dr. sc. admin. Henrijs Kaļķis. Darbs izklāstīts uz 63 lpp., ietver 40 attēlus, 7 tabulas, 8 pielikumus, 23 informatīvos avotus. Pētījums sastāv no 4 daļām. Pirmajā daļā ir apkopota un analizēta literatūra par metālasptrādes nozari, būtiskākajiem riskiem, arodslimību un nelaimes gadījumu statistika Latvijā, kā arī ergonomikas nozīme metināšanas operatoru darbā. Otrajā daļā ir aprakstītas pētījumā lietotās metodes, bet trešajā daļā ir iegūto datu apkopošana un rezultātu analīze, izklāsts. Izstrādāti preventīvie pasākumi. Iegūtie pētījuma…
Col : A Data Collection Protocol for Vanet
2012
International audience; In this paper, we present a protocol to collect data within a vehicular ad hoc network (VANET). In spite of the intrinsic dynamic of such network, our protocol simultaneously offers three relevant properties: (1) It allows any vehicle to collect data beyond its direct neighborhood (i.e., vehicles within direct communication range) using vehicle-to-vehicle communications only (i.e., the infrastructure is not required); (2) It tolerates possible network partitions; (3) It works on demand and stops when the data collection is achieved. To the best of our knowledge, this is the first collect protocol having these three characteristics. All that is chiefly obtained thanks…
Data-Driven Interactive Multiobjective Optimization Using a Cluster-Based Surrogate in a Discrete Decision Space
2019
In this paper, a clustering based surrogate is proposed to be used in offline data-driven multiobjective optimization to reduce the size of the optimization problem in the decision space. The surrogate is combined with an interactive multiobjective optimization approach and it is applied to forest management planning with promising results. peerReviewed
LPV model identification for gain scheduling control: An application to rotating stall and surge control problem
2006
Abstract We approach the problem of identifying a nonlinear plant by parameterizing its dynamics as a linear parameter varying (LPV) model. The system under consideration is the Moore–Greitzer model which captures surge and stall phenomena in compressors. The control task is formulated as a problem of output regulation at various set points (stable and unstable) of the system under inputs and states constraints. We assume that inputs, outputs and scheduling parameters are measurable. It is worth pointing out that the adopted technique allows for identification of an LPV model's coefficients without the requirements of slow variations amongst set points. An example of combined identification…
A decomposition approach for multidimensional knapsacks with family-split penalties
2022
The optimization of Multidimensional Knapsacks with Family-Split Penalties has been introduced in the literature as a variant of the more classical Multidimensional Knapsack and Multi-Knapsack problems. This problem deals with a set of items partitioned in families, and when a single item is picked to maximize the utility, then all items in its family must be picked. Items from the same family can be assigned to different knapsacks, and in this situation split penalties are paid. This problem arises in real applications in various fields. This paper proposes a new exact and fast algorithm based on a specific Combinatorial Benders Cuts scheme. An extensive experimental campaign computational…