105 research outputs found
Rescaling as a class relationship and process: The case of public procurement law in Turkey
No full textIn this study we focus on two problematic aspects of the recent rescaling literature: overgeneralization of abstractions rather than examination of concrete class forces; and unidirectional understanding of the relationship between rescaling processes in the core and periphery, where rescaling is seen as an outcome of the uneven development of capitalism based on the tendency of over-accumulated capitals in the core to move to the periphery. We suggest an alternative approach that conceives rescaling as a class relationship and process shaped by the contradictory interaction between global capitals in the core and newly growing capitals in the periphery. Through a study of the formation and transformation of the public procurement law in Turkey (2001-2005), we illustrate that the rescaling of the Turkish public procurement market was not only shaped by global capitals unidirectionally, but through their contradictory interaction with the domestic capitals in Turkey. Although the initial law was formed under the hegemony of global capitals, the AKP government then made many attempts to change the law in line with the demands of domestic capital groups. In this process, scale was shaped by the unequal but mutual power relationships between global and domestic capital groups. (c) 2006 Elsevier Ltd. All rights reserved
Rethinking anti-neoliberal strategies through the perspective of value theory: Insights from the Turkish case
No full textRecent anti-neoliberal strategies in Turkey tend to reflect national-developmentalist positions rather than classbased ones. This bias, however, has weakened the struggle against neoliberalism, by reinforcing national competitiveness agendas that increase the intensity of capital accumulation. From the perspective of value theory, this is particularly problematic today as the recent period of capitalism is characterized by predominance of abstract labor as the substance of value, manifested in the increasing dominance of capital over social relationships. In this context, class-based strategies are even more important in the struggle against neoliberalism
Experience with feedback control mechanisms in self-replicating multi-agent systems
No full text5th International Central and Eastern European Conference on Multi-Agent Systems -- SEP 25-27, 2007 -- Leipzig, GERMANYIn this paper, we present an approach for adaptive replication to support fault tolerance. This approach uses a feedback control theory methodology within an adaptive replication infrastructure to determine replication degrees of replica groups. We implemented this approach in a multiagent system to survive Byzantine failures. At the end of the paper, we also provide some experimental results to show the effectiveness of our approach
Mitigating Thermal Stratification in Lakes/Reservoirs Through Wind-Powered Air Diffusers
No full textThermal stratification can cause various water quality issues in large water bodies. To address this, a new wind-powered artificial mixing system is designed and experimentally tested for various Savonius rotor combinations (three-stage and four-stage rotors). These turbines directly utilize wind energy to draw air into the water column for aeration, bypassing the need for electrical conversion. The rotor performances were tested in terms of power and torque coefficients. Additionally, these rotors were tested for artificial mixing efficiencies in a specially designed water tank that can mimic thermal stratification typically observed in an actual water supply reservoir. Among the rotors, the three-stage rotor with a 60 degrees phase shift was found to exhibit superior power and torque coefficients, achieving a power efficiency value of 0.14. As for the mixing efficiency, the four-stage rotor with a 45 degrees phase shift excelled in mixing efficiency, reaching 95%.Practitioner Points A new wind-powered artificial mixing system is designed and tested for various Savonius rotor combinations. While keeping the total rotor height constant, the three-stage Savonius rotor class shows superior performance against the four-stage Savonius rotor class in terms of power and torque efficiency. Apart from the rotor performance results, the four-stage Savonius rotors show greater artificial mixing efficiency than the three-stage Savonius rotors. Single-pump/diffuser artificial destratification system exhibits better mixing efficiency than multiple-pump/diffuser systems. A new wind-powered artificial mixing system is designed and tested for various Savonius rotor combinations. The three-stage 60 degrees phase shift Savonius rotor demonstrated the best performance of turbine efficiency. The four-stage Savonius rotor with a 45 degrees phase shift connected to a single-pump system achieved the highest destratification efficiency at 95%. imag
Replication Based on Role Concept for Multi-Agent Systems
No full text10th International Workshop on Engineering Societies in the Agents World -- NOV 18-20, 2009 -- Utrecht, NETHERLANDSReplication is widely used to improve fault tolerance in distributed and multi-agent systems. In this paper, we present a different point of view on replication in multi-agent systems. The approach we propose is based on role concept. We define a specific "fault tolerant role. which encapsulates all behaviors related to replication-based fault tolerance in this work. Our strategy is mainly focused on replicating instances of critical roles in the agent organization. However, while doing this, we simply transfer the critical role and the fault tolerant role to appropriate agents. Here, the fault tolerant role is responsible for coordination between replicated role instances (replicas). Moreover, our approach is flexible in terms of fault tolerance since it is possible to easily modify existing behaviors of the "fault tolerant" role, remove some of its behaviors, or include new behaviors to it due to its characteristic architecture.Almende, D CIS Lab, Benelux Assoc Artificial Intelligence, FIPA, Dutch Res Sch Informat & Knowledge Syst, Netherlands Org Sci Res, Utrecht Univ, Dept Informat & Comp Sc
Implementing a multi-agent organization that changes its fault tolerance policy at run-time
No full text6th International Workshop on Engineering Societies in the Agents World -- OCT 26-28, 2005 -- Kusadasi, TURKEYIn this paper, we present an approach that supports simultaneously applying different fault tolerance policies in multi-agent organizations. The main strategy of our approach is to implement fault tolerance policies as reusable agent plans using HTN (Hierarchical Task Network) formalism. In this way, different fault tolerance policies such as static and adaptive ones can be implemented as different plans. In a static fault tolerance policy, all parameters related to the fault tolerance are set by a programmer before run-time. However, an adaptive fault tolerance policy requires dynamically adapting resource allocation and replication mechanisms by monitoring the system. Monitoring of a system brings some cost to the system. If all agents in an organization apply the adaptive fault tolerance policy, the monitoring cost will become an important factor for the system performance. Hence by applying our approach, the adaptive policy can be applied only to the critical agents whose criticalities can be observed during the organization's lifetime and the static one can be applied to the remaining agents. This reduces the monitoring cost and increases the overall organization performance. A case study has been implemented to show the effectiveness of our approach
Applying feedback control in adaptive replication mechanisms in fault tolerant multi-agent organizations
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