Formal Specification as High-Level Programming: The ASSL Approach

2012 ◽  
pp. 129-146
Author(s):  
Emil Vassev ◽  
Mike Hinchey
Keyword(s):  
Formal Specification ◽  
High Level

Policy-Based Security Engineering of Service Oriented Systems

2010 ◽  
pp. 118-133
Author(s):  
Antonio Maña ◽  
Gimena Pujol ◽  
Antonio Muñoz
Keyword(s):  
Formal Specification ◽  
Security Policy ◽  
Engineering Process ◽  
Specialized Knowledge ◽  
Security Engineering ◽  
Service Oriented ◽  
Automated Processing ◽  
Correct Application ◽  
High Level ◽  
The Web

In this chapter the authors present a policy-based security engineering process for service oriented applications, developed in the SERENITY and MISTICO projects. Security and dependability (S&D) are considered as first-class citizens in the proposed engineering process, which is based on the precise description of reusable security and dependability solutions. The authors’ process is based on the concept of S&D Pattern as the means to capture the specialized knowledge of security engineers and to make it available for automated processing, both in the development process (the focus of this chapter) and later at runtime. In particular, in this chapter they focus on the verification of the compliance with security policies, based on the formal specification of S&D Properties. The main advantages of the approach presented in this chapter are precisely that it allows us to define high-level policies and to verify that a secure oriented system complies with such policy (developed following the SERENITY approach). They also describe the application of the proposed approach to the verification of S&D properties in the web services (WS) environment. Concretely, the authors describe the use of SERENITY framework to facilitate the development of applications that use standard security mechanisms (such WS-Security, WS-Policy, WS-Security Policy, etc) and to ensure the correct application of these standard mechanisms, based on predefined policies. Finally, they show how to verify that the application complies with one or several S&D policies.

UniFrame

2005 ◽  
pp. 68-87 ◽  
Author(s):  
Andrew M. Olson ◽  
Rajeev R. Raje ◽  
Barrett R. Bryant ◽  
Carol C. Burt ◽  
Mikhail Auguston
Keyword(s):  
Formal Specification ◽  
Service Oriented Architectures ◽  
Distributed Computing Systems ◽  
Computing Systems ◽  
Service Oriented ◽  
Component Based Software Engineering ◽  
System Developer ◽  
High Level ◽  
Formal Specification Language

This chapter introduces the UniFrame approach to creating high quality computing systems from heterogeneous components distributed over a network. It describes how this approach employs a unifying framework for specifying such systems to unite the concepts of service-oriented architectures, a component-based software engineering methodology and a mechanism for automatically finding components on a network in order to assemble a specified system. UniFrame employs a formal specification language to define the components and serve as a basis for generating glue/wrapper code that connects heterogeneous components. It also provides a high level language for the system developer to use for inserting code in a created system to validate it empirically and estimate the quality of service it supports. The chapter demonstrates how a comprehensive approach, which involves the practicing community as well as technical experts, can lead to solutions of many of the difficulties inherent in constructing distributed computing systems.

Policy-Based Security Engineering of Service Oriented Systems

2010 ◽  
pp. 392-406
Author(s):  
Antonio Maña ◽  
Gimena Pujol ◽  
Antonio Muñoz
Keyword(s):  
Formal Specification ◽  
Security Policy ◽  
Engineering Process ◽  
Specialized Knowledge ◽  
Security Engineering ◽  
Service Oriented ◽  
Automated Processing ◽  
Correct Application ◽  
High Level ◽  
The Web

In this chapter the authors present a policy-based security engineering process for service oriented applications, developed in the SERENITY and MISTICO projects. Security and dependability (S&D) are considered as first-class citizens in the proposed engineering process, which is based on the precise description of reusable security and dependability solutions. The authors’ process is based on the concept of S&D Pattern as the means to capture the specialized knowledge of security engineers and to make it available for automated processing, both in the development process (the focus of this chapter) and later at runtime. In particular, in this chapter they focus on the verification of the compliance with security policies, based on the formal specification of S&D Properties. The main advantages of the approach presented in this chapter are precisely that it allows us to define high-level policies and to verify that a secure oriented system complies with such policy (developed following the SERENITY approach). They also describe the application of the proposed approach to the verification of S&D properties in the web services (WS) environment. Concretely, the authors describe the use of SERENITY framework to facilitate the development of applications that use standard security mechanisms (such WS-Security, WS-Policy, WS-Security Policy, etc) and to ensure the correct application of these standard mechanisms, based on predefined policies. Finally, they show how to verify that the application complies with one or several S&D policies.

FORMAL SPECIFICATION APPROACH OF ROLE DYNAMICS IN AGENT ORGANISATIONS: APPLICATION TO THE SATISFACTION-ALTRUISM MODEL

2007 ◽  
Vol 17 (05) ◽  
pp. 615-641 ◽  
Author(s):  
VINCENT HILAIRE ◽  
PABLO GRUER ◽  
ABDER KOUKAM ◽  
OLIVIER SIMONIN
Keyword(s):  
Formal Specification ◽  
Expressive Power ◽  
Role Playing ◽  
Low Level ◽  
Formal Framework ◽  
Multi Agent ◽  
High Level ◽  
Specification Analysis ◽  
Multi Agents

This article deals with the problem of dynamic role-playing in Multi-Agent organisations. The approach presented uses a formal specification notation and is based upon a formal framework which defines the concepts of role, interaction and organisation. Within this framework the problem of dynamic role-playing specification is related to the merging of specifications. The formal notation used composes Object-Z and Statecharts. The main features of this approach are: enough expressive power to represent Multi-Agents dynamic aspects, tools for specification analysis and mechanisms allowing the refinement of a high level specification into a low level specification which can be easily implemented. The last part of this paper presents an application with the specification of a reactive and cooperative MAS model named Satisfaction Altruism. An analysis of the specification validates the agents' behaviours.

Transcription factor/DNA interactions visualized by electron spectroscopic imaging

1992 ◽  
Vol 50 (1) ◽  
pp. 450-451
Author(s):  
David P. Bazett-Jones ◽  
Mark L. Brown
Keyword(s):  
Transcription Factor ◽  
Dna Sequences ◽  
Transcription Initiation ◽  
Molecular Mechanisms ◽  
Phosphorus Content ◽  
Spectroscopic Imaging ◽  
Electron Spectroscopic Imaging ◽  
Dna Backbone ◽  
Two Parameters ◽  
High Level

A multisubunit RNA polymerase enzyme is ultimately responsible for transcription initiation and elongation of RNA, but recognition of the proper start site by the enzyme is regulated by general, temporal and gene-specific trans-factors interacting at promoter and enhancer DNA sequences. To understand the molecular mechanisms which precisely regulate the transcription initiation event, it is crucial to elucidate the structure of the transcription factor/DNA complexes involved. Electron spectroscopic imaging (ESI) provides the opportunity to visualize individual DNA molecules. Enhancement of DNA contrast with ESI is accomplished by imaging with electrons that have interacted with inner shell electrons of phosphorus in the DNA backbone. Phosphorus detection at this intermediately high level of resolution (≈lnm) permits selective imaging of the DNA, to determine whether the protein factors compact, bend or wrap the DNA. Simultaneously, mass analysis and phosphorus content can be measured quantitatively, using adjacent DNA or tobacco mosaic virus (TMV) as mass and phosphorus standards. These two parameters provide stoichiometric information relating the ratios of protein:DNA content.

Advances in Stem Instrumentation for Biology

1990 ◽  
Vol 48 (1) ◽  
pp. 362-363
Author(s):  
J. S. Wall
Keyword(s):  
Scanning Transmission Electron Microscope ◽  
Carbon Films ◽  
Specimen Preparation ◽  
Material Deposition ◽  
Active User ◽  
Percent Improvement ◽  
Scanning Transmission ◽  
The Moment ◽  
Film Substrate ◽  
High Level

The forte of the Scanning transmission Electron Microscope (STEM) is high resolution imaging with high contrast on thin specimens, as demonstrated by visualization of single heavy atoms. of equal importance for biology is the efficient utilization of all available signals, permitting low dose imaging of unstained single molecules such as DNA.Our work at Brookhaven has concentrated on: 1) design and construction of instruments optimized for a narrow range of biological applications and 2) use of such instruments in a very active user/collaborator program. Therefore our program is highly interactive with a strong emphasis on producing results which are interpretable with a high level of confidence.The major challenge we face at the moment is specimen preparation. The resolution of the STEM is better than 2.5 A, but measurements of resolution vs. dose level off at a resolution of 20 A at a dose of 10 el/A2 on a well-behaved biological specimen such as TMV (tobacco mosaic virus). To track down this problem we are examining all aspects of specimen preparation: purification of biological material, deposition on the thin film substrate, washing, fast freezing and freeze drying. As we attempt to improve our equipment/technique, we use image analysis of TMV internal controls included in all STEM samples as a monitor sensitive enough to detect even a few percent improvement. For delicate specimens, carbon films can be very harsh-leading to disruption of the sample. Therefore we are developing conducting polymer films as alternative substrates, as described elsewhere in these Proceedings. For specimen preparation studies, we have identified (from our user/collaborator program ) a variety of “canary” specimens, each uniquely sensitive to one particular aspect of sample preparation, so we can attempt to separate the variables involved.

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