We can easily access a remote database as well as a local database with HTML forms. Although implementing a database application with HTML forms is much simpler than implementing it with a proprietary graphical user-interface system, HTML forms and CGI programs still must be coded. We implemented a software tool that automatically generates the SQL statements that create a database for an application, the forms that are used as a user interface, and the Java servlets that retrieve the data requested through the forms. The database tables to be created and the forms to be generated are determined by the class diagram for the application. Our software tool, which we call WebSiteGen, thus simplifies the implementation of a Web-based database application.

Evaluating analytically computer architecture performance is mostly cheap and quick. However, existing analytical performance evaluation techniques usually have a difficult and time-consuming modeling process. Moreover, existing techniques do not support well the capability for finding the bottleneck and its cause of a target system being evaluated. To address the above problems and to enhance analytical performance evaluation technology, in this paper we propose a software tool that accepts system models described in a specification language, generating an executable program that performs the actual performance evaluation. The whole approach is built on a subsystem-oriented performance evaluation tool, which is, in turn, based on a formal subsystem-oriented performance evaluation technique and a subsystem specification language.

This paper discusses a software verification support environment Vega which is based on a model-theoretic methodology that enables verification support for the temporal properties of protocol specifications described in the formal description technique LOTOS. In the methodology of Vega, a protocol specification is defined through the LOTOS process reflecting its practical system structure. The temporal properties to be verified are given as the requirement which the protocol needs to satisfy from the viewpoint of events and are formulated by using the branching time temporal logic defined in this paper. Verification is done by determining whether or not the given temporal properties are satisfied by the model, which corresponds to the transition system derived from the LOTOS specification of the protocol. Vega is provided with an effective interface function, as well as the function of simple model checking based on the above methodology, to give some degree of flexibility for the expression of temporal properties to be verified. Specifically, it allows the user to define useful expressions by combining builtin temporal logic formulas and enter them in Vega for use at any time. With the provision of these functions, Vega is expected to serve as a very powerful and flexible verification support tool.

In the program development process, it is ofren necessary for programmers to know the differences between two programs, or two different versions of a program. Since programs have structures such as iteration statement and selection statement, applying text-based tools such as UNIX diff to identify the differences may produce unsatisfactory results. In this paper, we exploit a tree as the internal representation of a program, obtain the mapping between two trees and display the program differences visually based on the mapping and pretty-printing technique so that the structural differences can be identified immediately.