This paper provides an overview of the formal semantics of VDM-SL which currently is being standardised by ISO. This is a specification language used in the formal method known as the Vienna Development Method (or simply VDM). In this paper we will focus on the foundations and the semantics of a rather unique combination of looseness and recursion.

The new manually deployed Laser In Situ Scattering Transmissometer-StreamLined profiler (LISST-SL) represents a major technological advance for suspended-sediment measurements in rivers. The LISST-SL is being designed to provide real-time data on sediment concentrations and particle-size distributions. A pressure sensor and current meter provide real-time depth and ambient velocity data, respec...

Today, business process modeling languages as one of the main components of information systems design are discussed. Many of these languages include limitations and possibilities that they cause only certain types of business process can be modeled. Just some of the business processes modeling languages, can support all of perspectives and few of them have real-time descriptions. This study pr...

The Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) is the etiological agent for the infectious disease, SARS, which first emerged 10 years ago. SARS-CoV is a zoonotic virus that has crossed the species barriers to infect humans. Bats, which harbour a diverse pool of SARS-like CoVs (SL-CoVs), are believed to be the natural reservoir. The SARS-CoV surface Spike (S) protein is a major an...

BACKGROUND Panic disorder affects 2-5% of the general population. In Argentina, one million people would be affected with a 91% rate of psychiatric comorbidity. AIM; To compare efficacy parameters between sublingual (ALP-SL) and conventional (ALP-CT) tablets of alprazolam in the treatment of acute phase of panic disorder with and without agoraphobia. SUBJECTS AND METHODS A comparative, multic...

Although the formal method VDM has been in existence since the 1970S, there are still no satisfactory tools to support verqkation in VDM. This paper deals with one possible means of approaching this problem by using the PVS theorem-prover It describes a translation of a VDM-SL speciJication into the PVS specification language using, essentially, the very transparent translation methods describe...

1. Manelfe C, Pasquine U, Banks WOo Metrizamide demonstration of the subarachnoid space surrounding the optic nerves. J Comput Assist Tomogr 1978;2: 545-547 2. Haughton VM , Davis JP, Eldevik OP, Gager WE. Optic nerve sheath imaging with metrizamide. lnvest Radio/1978 ;13 :544 3. Haughton VM , Davis JP, Harris GJ, Ho KC. Metrizamide optic nerve sheath opacification. Invest Radiol 1980; 15(4): 3...

We often need well-formed specifications in order to properly maintain or extend a system by members who were not in charge of the original development. In contrast to our expectation, formal specifications and related documents may not be maintained, or not developed in real projects. We are trying to build a framework to develop specifications from a working implementation. Testability of spe...