Philip E. Cannata

Integrating enterprise information models in Carnot

The authors describe a method for integrating separately developed information models. The models may be the schemas of databases, frame systems of knowledge bases, domain models of business environments, or process models of business operations. The method achieves integration at a semantic level by using an existing global ontology to develop semantic mappings among resources and resolve inconsistencies. The method is incorporated in a graphical integration tool. The integrated models provide a coherent picture of an enterprise and enable its resources to be accessed and modified coherently.<<ETX>>

The extensible services switch in Carnot

The Carnot project for developing a flexible framework for integrating heterogeneous information resources and applications, both within and among organizations, is reviewed. The effective use of such systems requires a way to flexibly and efficiently orchestrate related tasks on far-flung computing systems. A central component of the Carnot project, the extensible services switch (ESS), which provides interpretive access to applications and to communications and information resources at distributed sites, is discussed. The ESS is described as essentially a programmable glue that enhances interoperability by binding software components to one another.<<ETX>>

The irresistible move towards interoperable database systems

The successful use of interoperable database technology in major applications has not been widespread to date. This situation is rapidly changing to one where applications commonly share data resources and isolated application/data pairs may soon be the exception. The move to these applications with interoperable database systems is irresistible for a variety of reasons: corporate data, which has been accumulated across global corporate operations on various incompatible systems, is now recognized as a strategic asset; there is a growing willingness by competing information system vendors to cooperate; the emergence of OSI as a useful tool may mean that communication aspects of computers can be viewed as a commodity; and dramatic changes in the world-wide telecommunications fabric will be seen in the 1990s. MCC has a project called Carnot that is doing the research necessary to develop tool that will allow development of open applications that can be tightly integrated with information stored on existing, closed systems. These tools will allow participants to achieve efficient implementations of architectures such as Bellcores OSCA. The purpose of the Carnot system is to provide for the integration of a variety of resources within an enterprise and ultimately, across global enterprises.<<ETX>>

Task scheduling using intertask dependencies in Carnot

The Carnot Project at MCC is addressing the problem of logically unifying physically-distributed, enterprise-wide, heterogeneous information. Carnot will provide a user with the means to navigate information efficiently and transparently, to update that information consistently, and to write applications easily for large, heterogeneous, distributed information systems. A prototype has been implemented which provides services for (a) enterprise modeling and model integration to create an enterprise-wide view, (b) semantic expansion of queries on the view to queries on individual resources, and (c) inter-resource consistency management. This paper describes the Carnot approach to transaction processing in environments where heterogeneous, distributed, and autonomous systems are required to coordinate the update of the local information under their control. In this approach, subtransactions are represented as a set of tasks and a set of intertask dependencies that capture the semantics of a particular relaxed transaction model. A scheduler has been implemented which schedules the execution of these tasks in the Carnot environment so that all intertask dependencies are satisfied.

Structural Integration: Concepts and Case Study

When integrating the views of a large telecomunications application database at Bellcore, it was found that some pairs of view objects had significant structural similarities but differed semantically.+ This observation motivated the design of the structural integration methodology described in this article. Currently existing view and schema integration methodologies are based on semantic considerations. They allow integration only if two objects agree in their semantic and structural aspects. Structural integration permits the integration of objects even if they differ semantically. This article introduces structural integration for the case of full structural correspondence. We further develop an important special case, namely structural integration for classes with attribute partial correspondence. We use a subschema of the telecommunications application to demonstrate the applicability of structural integration to situations involving the complexities of real-world databases and applications. Algorithms for checking full structural correspondence of classes and databases are presented. Structural integration has several advantages, including the identification of shared common structures that are important for sharing of data and methods.

Pluralism in system integration: intelligent LEIM

The pluralistic approach to integrating existing nonintegrated systems is discussed in connection with the Intelligent Loop Equipment Inventory Module (ILEIM) project. A pluralistic approach is used because it exploits the strengths of various forms of representation, supports alternative views of data, and allows the incremental addition of information to a system without forcing a global reorganization. All the components of the integrated system communicate through translation into the general format of Cyc, a knowledge representation language. The individual system modules retain their individual views, yet are able to communicate and cooperate with each other via a shared high-level language. The ILEIM application domain, some specifics on how ILEIM works, and a sample interaction with the tool are described.<<ETX>>

A highly segmented lead-glass hodoscope for detection of multiple photon final states

Abstract Construction details and calibration techniques used in the implementation of a large lead-glass hodoscope are described. The algorithms used to determine the position and energy of the incident photons as well as the energy and position resolution are discussed.

Light quark spectroscopy and ππ phase shifts from the reaction π+p → Δ++π0π0 at 8.0 GeV/c

This paper describes the results of an experiment studying the reaction π+p → Δ++π0π0 using the Argonne National Laboratory 1.5 m streamer chamber combined with a lead glass hodoscope. The results of an energy‐independent amplitude analysis from threshold to 2.3 GeV are presented. In this analysis the f0(1270), the h0(2040), and a JP=2+ state at 1.8 GeV with a width of 0.280 GeV are observed. The amplitude ambiguity arising from analyses of π+π− → π+π− data in the 1.6 GeV region is resolved in favor of the β‐type solution. An energy‐dependent S‐wave phase shift analysis from 1.0 to 1.5 GeV is presented.

General features of the reaction π+p→Δ++π0π0 at 8 GeV/c

Characteristics of the reaction π+ p→Δ++π0π0 at 8 GeV/c are presented. The sample consists of some 27, 000 events for which mass spectra, t‐distributions, and ππ angular distributions are presented. The π0π0 mass spectrum rules out the ’’narrow e (700)’’ solution for the ππ S0 phase shift. Data in the 1300 MeV region show substantial S‐D wave interference.

General features of the reaction π

Characteristics of the reaction π+ p→Δ++π0π0 at 8 GeV/c are presented. The sample consists of some 27, 000 events for which mass spectra, t‐distributions, and ππ angular distributions are presented. The π0π0 mass spectrum rules out the ’’narrow e (700)’’ solution for the ππ S0 phase shift. Data in the 1300 MeV region show substantial S‐D wave interference.