Search results for "SHARE"
showing 10 items of 451 documents
Concurrent Computing with Shared Replicated Memory
2019
Any concurrent system can be captured by a concurrent Abstract State Machine (cASM). This remains valid, if different agents can only interact via messages. It even permits a strict separation between memory managing agents and other agents that can only access the shared memory by sending query and update requests. This paper is dedicated to an investigation of replicated data that is maintained by a memory management subsystem, where the replication neither appears in the requests nor in the corresponding answers. We specify the behaviour of a concurrent system with such memory management using concurrent communicating ASMs (ccASMs), provide several refinements addressing different replic…
Advanced C++11 Multithreading
2018
Abstract The previous chapter introduced the basic concepts of multithreading using the C++11 threading API starting with basic spawn and join approaches, while finishing with non-trivial synchronization based on mutexes and condition variables. However, the major bottleneck of application performance is usually caused by contention for a shared resource. In case of mutex-based programming all participating threads usually try to acquire the same lock in parallel which effectively serializes the program for lightweight operations such as increment/decrement or updates of a single scalar value. Fortunately, modern CPUs provide dedicated commands that allow for the efficient execution of unin…
Dynamic Spectrum Reservation for CR Networks in the Presence of Channel Failures: Channel Allocation and Reliability Analysis
2018
[EN] Providing channel access opportunities for new service requests and guaranteeing continuous connections for ongoing flows until service completion are two challenges for service provisioning in wireless networks. Channel failures, which are typically caused by hardware and software failures or/and by intrinsic instability in radio transmissions, can easily result in network performance degradation. In cognitive radio networks (CRNs), secondary transmissions are inherently vulnerable to connection breaks due to licensed users' arrivals as well as channel failures. To explore the advantages of channel reservation on performance improvement in error-prone channels, we propose and analyze …
Resource sharing optimality in WiFi infrastructure networks
2009
In WiFi networks, mobile nodes compete for accessing a shared channel by means of a random access protocol called Distributed Coordination Function (DCF). Although this protocol is in principle fair, since all the stations have the same probability to transmit on the channel, it has been shown that unfair behaviors may emerge in actual networking scenarios. Assuming that a contending node can dynamically change its strategy, by tuning its contention parameters to non-standard values on the basis of channel observations, we prove that, for infrastructure networks with bidirectional traffic and homogeneous application requirements, selfish access strategies are able to reach equilibrium condi…
What should I do next? Using shared representations to solve interaction problems
2011
Studies on how “the social mind” works reveal that cognitive agents engaged in joint actions actively estimate and influence another’s cognitive variables and form shared representations with them. (How) do shared representations enhance coordination? In this paper, we provide a probabilistic model of joint action that emphasizes how shared representations help solving interaction problems. We focus on two aspects of the model. First, we discuss how shared representations permit to coordinate at the level of cognitive variables (beliefs, intentions, and actions) and determine a coherent unfolding of action execution and predictive processes in the brains of two agents. Second, we discuss th…
Distributed pedagogical leadership and generative dialogue in educational nodes
2012
The article presents practices of distributed pedagogical leadership and generative dialogue as a tool with which management and personnel can better operate in the increasingly turbulent world of education. Distributed pedagogical leadership includes common characteristics of a professional learning community when the educational actors intentionally share a common mission. There, all stakeholders take collective responsibility for students' learning. Generative dialogue is a way to negotiate in this realm in generating new knowledge and understanding. To introduce this process in practice, the article describes two Finnish learning environments where the stakeholders define, first, the c…
Parallelization strategies for density matrix renormalization group algorithms on shared-memory systems
2003
Shared-memory parallelization (SMP) strategies for density matrix renormalization group (DMRG) algorithms enable the treatment of complex systems in solid state physics. We present two different approaches by which parallelization of the standard DMRG algorithm can be accomplished in an efficient way. The methods are illustrated with DMRG calculations of the two-dimensional Hubbard model and the one-dimensional Holstein-Hubbard model on contemporary SMP architectures. The parallelized code shows good scalability up to at least eight processors and allows us to solve problems which exceed the capability of sequential DMRG calculations.
El papel de la confianza, la imagen y los valores compartidos en la creación de valor y lealtad: aplicación a la relación egresado-universidad
2014
ResumenEl presente estudio plantea una aplicación del marketing de relaciones en el ámbito de la educación superior, específicamente la relación egresado-universidad. El modelo propuesto aporta variables poco estudiadas en este ámbito y tiene como objetivo estudiar el papel de la confianza en la relación egresado-universidad, sus posibles antecedentes y sus consecuencias. Los resultados muestran cómo la imagen de la universidad, la satisfacción y los valores compartidos de los egresados influyen positivamente en la confianza, la cual, a su vez, afecta al valor percibido y a los niveles de lealtad. Las conclusiones e implicaciones aportan conocimientos innovadores con relación al mantenimien…
La parziale divergenza di interessi tra gli shareholder nella formulazione della strategia aziendale
2020
La storia economica del secolo scorso ha mostrato come specializzazione del lavoro, da un lato, e la necessità di suddividere il rischio tra più investitori, dall’altro lato, abbiano spinto al “divorzio” o, meglio, alla separazione tra la proprietà e il controllo di molte aziende. Esplorando le conseguenze della separazione tra la proprietà e il controllo, gli studi di corporate governance, tradizionalmente, hanno messo in luce i possibili conflitti tra manager e azionisti, denominati conflitti principal-agent. Inoltre, gli studi precedenti hanno riconosciuto la distribuzione della proprietà come un meccanismo utile ad alleviare suddetti conflitti. Il presente capitolo discute criticamente …
The impact of space development structure on the level of ecological footprint - Shift share analysis for European Union countries
2022
The impact of the space development structure on the level of the ecological footprint is an important element of the sustainable development policy, determining not only its directions, but also indicating the manner of respecting en- vironmental principles. The aim of the research is to assess the impact of the spatial development structure on the eco- logical footprint level. The considerations are based on the assumption that the spatial development structure is a determinant of the ecological footprint level. The study used the shift share analysis method. Selected European coun- tries were the subject of the research. The research period covered the years 2009–2019. The spatial differ…