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Designers of Microwave systems are constantly looking for DACs which provide not only Nyquist zones larger than 2.5 GHz but which also offer flat frequency response in these large instantaneous bandwidths, and in addition which also generate these signals with a centre frequency that is in the frequency band of interest. The component's performance can have strong implications in how microwave systems...
The ability of the new generation of Digital to Analog Converter (DAC)s to convert from a digital signal directly into high frequency bands can be seen as a large leap in capability allowing greater system flexibility, reduction in component footprint and power consumption. This paper presents a new high speed, high bandwidth Digital to Analog Converter with high sample rate and high output bandwidth...
Cities are structured into sub-units such as the city center or business districts and peripheral areas. From a spatial perspective, discrimination or delineation of the city center is a very challenging task as there exist numerous ways to characterize city centers: besides functional characteristics, also morphological features can be used. In this paper, we present a study which links the floor...
This paper presents the new Passive Radar and Signal Intelligence signal chain possibilities that are created by the latest 12-bit 4.5GSPS ADC development.
This paper discusses the benefits of group work in a Collaborative Virtual Computer Laboratory (CVCLAB) to enhance student learning in information security fields. The CVCLAB integrates virtual machine technologies and pedagogical approaches in a collaborative leaning model to address the challenges in the information security education. A qualitative analysis of student experiences of the CVCLAB...
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is a mid-infrared emission spectrometer which is part of the core payload of the Envisat satellite, launched by ESA in March 2002. It provides unique observations of the atmospheric spectral radiances in the 4.15 – 14.6 µm spectral interval with innovative limb scanning capabilities for the three dimensional observation of the atmospheric...
This paper is an attempt to transfer some results in the meta-theory of conceptual modeling of software systems to discrete event simulation modeling. We present DESO, a foundational ontology for discrete event system modeling derived from the foundational ontology UFO. The main purpose of DESO is to provide a basis for evaluating discrete event simulation languages.
We show how a basic discrete event simulation language can be enabled for business process modeling and simulation by adding an activity construct. While activities are often not considered at all or not treated in a conceptually satisfactory way in the discrete event simulation literature, the great majority of business process modeling languages are based on an activity construct. However, unlike...
We assess the autonomic nervous system response during prolonged percutaneous transluminal coronary angioplasty (PTCA) by heart rate variability analysis using multifractal indices. These indices are also used to evaluate the effects of the PTCA at different arteries. The indices augmented significantly during transient ischemia and reperfusion periods indicating an increase of multifractal degree...
Nowadays, simulation scenarios require enhanced agents being capable of communication, learning and having beliefs about their self or about their world. The distinction between facts and (possible false) beliefs is part of the requirements in order to describe scenarios closer to real world. This work proposes a solution which allows information exchange between agents, making use of generic/standard...
The purpose of this study was to assess the dynamics of the heart rate during myocardial ischemia produced by long PTCA procedures using multifractal signal properties. We found significant complex reactions due to the effects of coronary occlusion on the autonomic control of the cardiac rhythm which suggests that the multifractal indices may be a promising non-linear technique to evaluate the autonomous...
Nowadays, business rules receive a lot of attention from both industry and academia, as they are considered the ideal vehicle for capturing business logic. The purpose of our paper is to raise the level of business logic abstraction with the help of existing, mature enough, R2ML language, in order to obtain higher semantic representations of rules and their basic constructs i.e. SBVR. Our paper focuses...
It is widely acknowledged that business process management would greatly benefit from integration with business rule management. But there is still no established solution to this integration problem, and the leading business process modeling language, BPMN, does not provide any explicit support for rules. In this paper, we are going to investigate the extension of BPMN by adding rules as a modeling...
While the generation of executable code for explicit associations in UML models is well understood, it is less clear how executable code can be generated if the associations are derived. We discuss how this can be achieved for an important class of derived associations that are defined by means of derivation rules. The result is optimized and executable (as opposed to template) code. The generated...
While memory-safe and type-safe languages have been available for many years, the vast majority of software is still implemented in type-unsafe languages such as C/C++. Despite massive concerted efforts by software vendors such as Microsoft to eliminate buffer overflow vulnerabilities through automated and manual code review, they continue to be found and exploited. We present a novel approach that...
A business process usually includes multiple business partners that use systems with their business logics represented in different rule (or policy) languages. The integration of business processes is a major goal followed by business enterprises and involves the interchange of business rules and policies between partners. However, the variety of business rules employed by the partners presents a...
This paper is a brief survey on the topic of rule modeling and rule interoperability. A framework focusing on the first two levels of the MDA (that is, on business/domain models and on logical design models) is described. Rules are modeled either in natural language (ACE) or by means of a visual language (VRML). The interoperability layer is performed by R2ML an XML markup for rules. OMG has defined...
This paper describe how essential parts of the Java vocabulary can be described using RDFS. First part of the paper describe a mapping solution from Java vocabulary to RDF Schema. In the second part we define a new RDFS extension to express additional vocabulary elements into RDFS.
The actual rule based implementations point to different rule target platforms and languages (object oriented rule languages, semantic Web rule languages, artificial intelligence rule languages) in a business landscape dominated by a limited number of tool vendors as well as competitive open-source platforms and rule interoperability initiatives. This work provides a description of business rules...
The purpose of this study was to provide a methodology in order to characterize autonomous nervous system (ANS) changes before, during and after percutaneous transluminal coronary angioplasty (PTCA). This methodology, based on a multiscale information analysis (MIA) of the heart rate variability, has taken into account entropy rates. The study group consisted of 66 patients undergoing PTCA: 1 in the...
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