In this paper, we present a method and an associated tool suite for formal verification of the new ETCS level 2 based Danish railway interlocking systems. We have made a generic and reconfigurable model of the system behavior and generic high-level safety properties. This model accommodates sequential release – a feature in the new Danish interlocking systems. The generic model and safety prope...

We performed a prospective, randomized controlled study on 60 patients with fresh closed diaphyseal tibial fractures to determine the effect of percutaneous autologous bone marrow injection on union rate. Sixty patients were randomized into a group of 30 patients each. 30 patients were treated with reamed intramedullary interlocking nail and 30 patients were treated with combination of reamed i...

In this project the verification of safety conditions for the control of a railway interlocking system written in ladder logic is carried out. All translation steps have been implemented and tested for a real-world example of a railway interlocking system. The steps in this translation are as follows: 1. The development of a mathematical model of a railway interlocking system and the translatio...

In this paper we present a verification strategy for signalling principles for the control of a railway interlocking system written in ladder logic. All translation steps have been implemented and tested on a real-world example of a railway interlocking system. The steps in this translation are as follows: 1. The development of a mathematical model of a railway interlocking system and the trans...

In this paper we present a verification strategy for signalling principles for the control of a railway interlocking system written in ladder logic. All translation steps have been implemented and tested on a real-world example of a railway interlocking system. The steps in this translation are as follows: 1. The development of a mathematical model of a railway interlocking system and the trans...

Interlocking of the zygapophysial joints of the lower cervical spine may occur on one or both sides. This paper reports thirty-seven cases of unilateral interlocking (hemiluxation). In the literature unilateral interlocking is usually regarded as a form of dislocation, a term which includes other types of displacement as well. Thus, in the oldcr literature, the term dislocation often refers to ...

This paper describes a framework currently under development for modelling, simulation, and verification of relay interlocking systems as used by the Danish railways. The framework is centred around a domain-specific language (DSL) for describing such systems, and provides (1) a graphical editor for creating DSL descriptions, (2) a validator for checking that DSL descriptions are statically wel...

It is an open problem, posed in [3], to determine the minimal k such that an open flexible k-chain can interlock with a flexible 2-chain. It was first established in [5] that there is an open 16-chain in a trapezoid frame that achieves interlocking. This was subsequently improved in [6] to establish interlocking between a 2-chain and an open 11-chain. Here we improve that result once more, esta...

Filling a gap in the interlocks literature which has been largely centered on the West, we present preliminary data on the pattern of interlocking directorates among the top 200 largest corporations in pre-1997 Hong Kong. Then we identify four separate groups of firms in Hong Kong, and suggest propositions based on the resource dependence perspective on the critical relationships among their in...

For supporting the analysis of railway interlocking systems in the early stage of their design we propose the use of model checking. We investigate the use of the formal modelling language CSP and the corresponding model checker FDR. In this paper, we describe the basics of this formalism and introduce our formal model of a railway interlocking system. Checking this model against the given safe...