Pudji Astuti

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This paper presents a stability concept of a class of discrete event systems (DESs) using Markov chains. The DESs under consideration are modeled as state machines adopted from Ramadge-Wonham which represent the hybrid dynamic models of constrained motion systems. By identifying the probability of ring enabled events of the DES, p-convergence is proposed.(More)
A new approach to the planning and analysis of the successful convergence of assembly is presented. The convergence is refered to as p-convergence, since it is derived within a probability framework. The assembly is modeled as a hybrid dynamic system (HDS) accounting for the presence of the discrete change of contact and the continuous movement during the(More)
This paper presents a method for discrete event controller (DEC) synthesis for a manipulation task modeled as a hybrid dynamic system (HDS). The modelling of a manipulation task as a HDS has been shown to be a very eeective strategy to incorporate the interaction of the robot manipulator with its environment. In addition, this modelling has allowed the(More)
If f is an endomorphism of a finite dimensional vector space over a field K then an invariant subspace X ⊆ V is called hyperinvariant (respectively, characteristic) if X is invariant under all endomorphisms (respectively, automorphisms) that commute with f . According to Shoda (Math. Zeit. 31, 611–624, 1930) only if |K| = 2 then there exist endomorphisms f(More)
A discrete event controller (DEC) synthesis methodology for the successful convergence of assembly is presented. The modelling of an assembly process as a hybrid dynamic system (HDS) has been shown to be a very eeective strategy to incorporate the interaction between the workpiece and its environment. In addition, this modelling has allowed the derivation(More)
Pregnanediol glucuronide (PdG) in feces and serum progesterone (P ) were analyzed for determining 4 ovarian cycle as well as to evaluate ovarian function of captive-housed Javan Gibbon (Hylobates moloch). A total of four females Javan Gibbons maintained in single-typed cage at Ragunan Zoo (Owa1 and Owa2) and in pairing-typed cage at Taman Margasatwa Taman(More)