Large and complex software systems contain a variety of entities (objects) and a complex control system (transformation function). The pure object-oriented design and structured design approaches concentrate on either...
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Large and complex software systems contain a variety of entities (objects) and a complex control system (transformation function). The pure object-oriented design and structured design approaches concentrate on either objects or the transformation function separately. As such they may not be adequate in isolation, to deal with the design of complexsystems. Therefore, it makes sense to study their combination. In this paper we propose a Combined Functional and Object-Oriented Design approach (CFOOD) based on the extended object-oriented design method proposed by P. Jalote. The CFOOD approach makes full use of the object-oriented design and structured design techniques combining the object view and the functional view to provide a more complete view of a system. We demonstrate the use of our approach by a design example of a hospital patient monitoring system.
MIMO OFDM systems are applied in ieee 802.11n wireless communication standard for improvement of transmission ability. In MIMO OFDM systems, to recover mixed source signals in receivers is one of significant objective...
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An issue in the development of large and complexsystems is that the design process is essentially open-ended. The systemsengineering phase finds an acceptable theoretical design and passes it on for manufacturing. L...
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An issue in the development of large and complexsystems is that the design process is essentially open-ended. The systemsengineering phase finds an acceptable theoretical design and passes it on for manufacturing. Little attention is paid to 'real-world' detrimental effects of manufacturing and operational variabilities upon the 'designed' system performance levels. Alternatively to try to account for such effects, a 'worst-case' system design is often attempted with predictable impact to system costs. As a result of the above issues, the importance of running statistically based system and subsystem level simulations has become particularly critical in this period of increasingly complex commercial systems, defense conversions and dual-use technologies. Monte Carlo techniques could be considered, but will often lead to excessively time-consuming and inefficient design tools. In this paper, we present a means of coupling more efficient statistical techniques (based on a Design of Experiments methodology) to conventional systems simulators. The resulting software tool, called STADIUM, is currently in use within industry to characterize system performances in terms of circuit, subsystem and system level variabilities.
The HFSS frequency domain computer code, installed oil an AIX-3 computer, was used to model geometrical-ly complex electromagnetic system operating over many decades of frequencies in nonhomogeneous media. First, we u...
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ISBN:
(纸本)076950759X
The HFSS frequency domain computer code, installed oil an AIX-3 computer, was used to model geometrical-ly complex electromagnetic system operating over many decades of frequencies in nonhomogeneous media. First, we used a single processor unit, find then 16 processors operating in parallel. Since the Maxwell equations used ill the HFSS code show no lime dependence, parallelprocessing can be conducted not only for the frequency brit also for the time domain modeling (using Fourier transform).
This technical paper provides a synopsis of in-progress research and development in reuse and certification of software components at Rome Laboratory of the Air Force Materiel Command, Rome, NY. A Certification Framew...
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This technical paper provides a synopsis of in-progress research and development in reuse and certification of software components at Rome Laboratory of the Air Force Materiel Command, Rome, NY. A Certification Framework for software components was developed which is sensitive to varying domains, business strategies and component types. A cost benefit plan, an operational concept, a suite of certification tools, and a prototype were defined. Field trial procedures were developed, applied, and the results reported.
Self-awareness has a long history in biology, psychology, medicine, and more recently in engineering and computing, where self-aware features are used to enable adaptivity to improve a system's functional value, p...
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ISBN:
(纸本)9781467383882
Self-awareness has a long history in biology, psychology, medicine, and more recently in engineering and computing, where self-aware features are used to enable adaptivity to improve a system's functional value, performance and robustness. With complex many-core systems-on-Chip (SoCs) facing the conflicting requirements of performance, resiliency, energy, heat, cost, security, etc. - in the face of highly dynamic operational behaviors coupled with process, environment, and workload variabilities - there is an emerging need for self-awareness in these complex SoCs. Unlike traditional MultiProcessor systems-on-Chip (MPSoCs), self-aware SoCs must deploy an intelligent co-design of the control, communication, and computing infrastructure that interacts with the physical environment in real-time in order to modify the system's behavior so as to adaptively achieve desired objectives and Quality-of-Service (QoS). Selfaware SoCs require a combination of ubiquitous sensing and actuation, health-monitoring, and statistical model-building to enable the SoC's adaptation over time and space. After defining the notion of self-awareness in computing, this paper presents the Cyber-Physical System-on-Chip (CPSoC) concept as an exemplar of a self-aware SoC that intrinsically couples on-chip and crosslayer sensing and actuation using a sensor-actuator rich fabric to enable self-awareness.
How to improve the design efficiency of complex product with meta-synthesis is a valuable research problem. The research achievements of complex product design based on meta-synthesis, which has been made by the autho...
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ISBN:
(纸本)9781479906529
How to improve the design efficiency of complex product with meta-synthesis is a valuable research problem. The research achievements of complex product design based on meta-synthesis, which has been made by the author's research group, is summarizd in this paper. First, the process model and the general framework of complex product design based on meta-synthesis are established. Then, the architecture and the key technologies of HWME is presented, including group argumentation and group decision, project management, 3-d visualization, model and data management. Finally, a prototype system of HWME for complex product design is developed.
engineering baselines are a new paradigm for use in system development which enables controlled visibility and traceability into the complete development effort. Among the primary features of this paradigm is its comp...
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engineering baselines are a new paradigm for use in system development which enables controlled visibility and traceability into the complete development effort. Among the primary features of this paradigm is its comprehensiveness and feasibility, i.e., its simplicity and usability by everyone involved at all levels. It is recognized that no matter how good an approach may be otherwise, unless it is one that all engineers can readily apply, on-the-spot at their desk or benches, it on balance falls short of the need. The three principal unique features that sustain both the comprehensiveness and feasibility of engineering baselines are discussed.
A difficult task in the process of engineering large complex computing systems is the derivation of requirements which assure that a system can supply the expected behavior the presence of faults. This paper provides ...
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A difficult task in the process of engineering large complex computing systems is the derivation of requirements which assure that a system can supply the expected behavior the presence of faults. This paper provides insight into the constraints placed upon the system during the requirements specification phase of the system life-cycle by quality of service requirements, such as performance, reliability, availability, safety, and timeliness. Focusing on a simple environmental control system, we examine the derivation of requirements to support system resiliency to faults. After partitioning possible system behaviors into acceptable and unacceptable sets, we provide guidelines for specifying acceptable behavior using the following process: define the normal behavior for a correct system;identify the fault hypothesis appropriate to the system and applications;and, define the exceptional behavior for a partially correct system satisfying the system fault hypothesis. We motivate the specification of a health management function to assure acceptable behavior to the extent indicated by the quality of service requirements and the dependability constraints of availability, reliability, safety, integrity, confidentiality, and maintainability.
complexsystems are difficult to analyze because of unknown interactions and dependencies among system components, and between the system and the environment. These interactions and dependencies tend to produce unpred...
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ISBN:
(纸本)9781479938407
complexsystems are difficult to analyze because of unknown interactions and dependencies among system components, and between the system and the environment. These interactions and dependencies tend to produce unpredictable behaviors that can often lead to detrimental outcomes. Traditional systemsengineering that relies on reductive approaches are not suitable for the analysis and design of complexsystems. This recognition has led to the development of new paradigms, methods, and tools that better enable: exploration of a complex system's behavior and tradespace;detection, diagnosis, and visualization of component/subsystem dependencies and interactions;and identification, alerting, and circumvention of potentially undesirable interactions. This paper presents a system model-driven interactive storytelling approach for analyzing interactions and dependencies within complexsystems, and between complexsystems and the environment. An exemplar complex system is used to convey key elements of the approach. The methodology is applicable for a variety of complexsystems such as global supply chains, power and energy management, transportation networks, aerospace and aviation enterprises, and defense systems.
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