Fault-tolerant Cooperative Tasking for Multi-agent Systems

A natural way for cooperative tasking in multi-agent systems is through a top-down design by decomposing a global task into sub-tasks for each individual agent such that the accomplishments of these sub-tasks will guarantee the achievement of the global task. In our previous works [1], [2] we presented necessary and sufficient conditions on the decomposability of a global task automaton between cooperative agents. As a follow-up work, this paper deals with the robustness issues of the proposed top-down design approach with respect to event failures in the multi-agent systems. The main concern under event failure is whether a previously decomposable task can still be achieved collectively by the agents, and if not, we would like to investigate that under what conditions the global task could be robustly accomplished. This is actually the fault-tolerance issue of the top-down design, and the results provide designers with hints on which events are fragile with respect to failures, and whether redundancies are needed. The main objective of this paper is to identify necessary and sufficient conditions on failed events under which a decomposable global task can still be achieved successfully. For such a purpose, a notion called passivity is introduced to characterize the type of event failures. The passivity is found to reflect the redundancy of communication links over shared events, based on which necessary and sufficient conditions for the reliability of cooperative tasking under event failures are derived, followed by illustrative examples and remarks for the derived conditions.Comment: Preprint, Submitted for publicatio

The determination of seed yield and yield components in some bean (Ph. vulgaris) cultivars and correlations between these characters under the Çukurova conditions

This research was conducted to determine suitable bean cultivars under Çukurova conditions, as well as to find out the correlations between seed yield and yield components. According to the experiment years' average, the seed yield of bean cultivars varied from 57.4 to119.6 kg/da and from 16.5 to 97.5 kg/da in dwarf and climbing beans respectively sehirali-90 and Yalova-5 in dwarf beans and Dermason-Malatya and Horoz-Tokat in climbing beans had the high seed yield in both experiment years. Positive correlation cofficients were found between seed yield and 100 seed number in dwarf beans. Also, there were positive correlation coefficients between seed yield and total pod number, filled pod number, seed weight per plant and seed number per plant in twining beans.This research was conducted to determine suitable bean cultivars under Çukurova conditions, as well as to find out the correlations between seed yield and yield components. According to the experiment years' average, the seed yield of bean cultivars varied from 57.4 to119.6 kg/da and from 16.5 to 97.5 kg/da in dwarf and climbing beans respectively sehirali-90 and Yalova-5 in dwarf beans and Dermason-Malatya and Horoz-Tokat in climbing beans had the high seed yield in both experiment years. Positive correlation cofficients were found between seed yield and 100 seed number in dwarf beans. Also, there were positive correlation coefficients between seed yield and total pod number, filled pod number, seed weight per plant and seed number per plant in twining beans

The determination of seed yield and yield components in some bean (Ph. vulgaris) Cultivars and Correlations between These Characters under the Çukurova Conditions [Çukurova koşullarinda bazi fasulye (Phaseolus vulgaris L.) çeşitlerinde tane verimi ve verimle i·lgili özellikler ile bu özellikler arasi i·lişkilerin saptanmasi]

This research was conducted to determine suitable bean cultivars under Çukurova conditions, as well as to find out the correlations between seed yield and yield components. According to the experiment years' average, the seed yield of bean cultivars varied from 57.4 to 119.6 kg/da and from 16.5 to 97.5 kg/da in dwarf and climbing beans respectively şehirali-90 and Yalova-5 in dwarf beans and Dermason-Malatya and Horoz-Tokat in climbing beans had the high seed yield in both experiment years. Positive correlation cofficients were found between seed yield and 100 seed number in dwarf beans. Also, there were positive correlation coefficients between seed yield and total pod number, filled pod number, seed weight per plant and seed number per plant in twining beans

A research on determining yields and adaptation of some pea (Pisum sativum ssp. sativum L. and Pisum sativum ssp. arvense L.) lines at conditions of Cukurova

Bu araştırma, Çukurova koşullarına uygun bazı bezelye (P.sativum ssp. sativum L. ve P. sativum ssp. arvense L.) hatlarının saptamnasi amacıyla 1996-97 ve 1997-98 yılları arasında, Ç.Ü. Ziraat Fakültesi Tarla Bitkileri Bölümü Deneme Alanında, kıraç koşulları temsil eden arazide 3 tekrarlamalı tesadüf blokları deneme desenine göre yürütülmüştür. Araştırmada, ICARDA'dan sağlanan 14 P. sativum ssp. sativum L. ve 10 P.sativum ssp. arvense L. hattin da tane verimi ve verimle ilgili özellikler incelenmiştir. İki yıllık ortalama değerlere göre, P.sativum ssp. sativum hatlarından 88P090-5-21, Suriye Lokal Halep-1 ve Spring Pea 2, P.sativum ssp. arvense L. hatlarindan 89P109-12, 89P109-13, P.397-4, 88P035-4-4 ve WA-933 Çukurova koşullarına uyum gösterebilen ve yüksek tane verimine sahip olan hatlar olarak saptanmıştır. Bu araştırmada, ssp. sativum hatlarında baklada tane sayısı ve 1000 tane ağırlığı dışında kalan, ssp. arvense hatlarında ise çiçeklenmeye kadar geçen gün sayısı dışında kalan diğer özellikler ile tane verimi arasinda olumlu ve önemli ilişkiler saptanmıştır.This experiment was carried out to determine suitable pea (P. sativum spp. sativum L and P. sativum ssp. arvense L) lines on Cukurova conditions at the Experimental Area of Field Crops Department, Faculty of Agriculture, University of Cukurova between in 1996-97 and 1997-98 years. It was arranged in randomized blocks experiment design with three replications. In this study, seed yield and yield components were investigated in 14 lines of Pisum sativum and 10 lines of Pisum sativum ssp. arvense, which were orginated ICARDA. According to the combined analysis of two years, 88P090-5-21, Suriye Lokal Halep-1 and Spring Pea 2, from P. sativum ssp. sativum L 89P109-12, 89P109-13, P.397-4, 88P035-4-4 and WA-933, from P. sativum ssp. arve«5e L. were determined as adaptable to Cukurova conditions and have high yield lines. In this research, significant and positive correlation between other characters and seed yield was determined except seed number per pod and 1000 seed weight in ssp. sativum lines, days to flowering in ssp. arvense lines

Design of Observers for Hybrid Systems

A methodology for the design of dynamical observers for hybrid plants is proposed. The hybrid observer consists of two parts: a location observer and a continuous observer. The former identifies the current location of the hybrid plant, while the latter produces an estimate of the evolution of the continuous state of the hybrid plant. A synthesis procedure is offered when a set of properties on the hybrid plant is satisfied