作者：
PACE, DKVLAHOS, MThe Author The Author is a member of the Principal Professional Staff of The Johns Hopkins University Applied Physics Laboratory (APL). From 1987 to 1989
he was APL's resident liaison with the Naval War College where as an adjunct professor he developed an elective course on technology and naval warfare as well as serving as analytic lead for the Technology Initiative Games. He teaches in the graduate technical management curriculum of the Whiting School of Engineering at The Johns Hopkins University. As a specialist in operations research and systems analysis his professional responsibilities include leadership roles in the Military Operations Research Society the Summer Computer Simulation Conference the American Society of Engineering Management and membership on the ASNE JournalCommittee. His undergraduate studies were in mathematics and physics at the University of Chicago and his graduate studies in theology at several seminaries with a decade as a correctional chaplain.
The world has changed dramatically in the past few years. In large part, many of the changes have been driven by the emphasis now given to contingency and limited war operations. Navy leadership even coined a special ...
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The world has changed dramatically in the past few years. In large part, many of the changes have been driven by the emphasis now given to contingency and limited war operations. Navy leadership even coined a special term for them late in the 1980s: CALOW (Contingency and Limited Objective Warfare). As a result, naval planning has also changed, and with it so have the demands upon naval engineering. This paper addresses some of the factors that are now shaping naval planning. Characteristics of contingency and limited war operations are presented. Their implications for naval planning, for naval systems, for concepts of employment, and for naval force structure are examined. It is important that both Navy leadership and the naval engineering community understand these implications fully so that they may respond to them appropriately. The specific value of this paper lies in its synthesis of information so that the naval engineering community may appreciate the full impact of future contingency and limited war operations.
Analysis pervades all aspects of naval engineering. It is used to determine requirements for new or upgraded systems and to explore concepts for their employment. It is used to evaluate performance. It is used to esta...
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Analysis pervades all aspects of naval engineering. It is used to determine requirements for new or upgraded systems and to explore concepts for their employment. It is used to evaluate performance. It is used to establish design characteristics. And it comes in many varieties. This paper addresses use and misuse of analysis in naval engineering. The paper is oriented toward managers of analytic endeavors rather than the practitioners of analysis. It does not deal in depth with how to perform particular analytic techniques. Instead it discusses general principles that should guide both the selection and application of analytic techniques. The paper identifies problems which are frequently encountered in analyses related to naval engineering and suggests ways to ameliorate their deleterious effects. These problems are addressed from both the perspective of the manager of analysis and that of the user or consumer of results from the analysis. Some of the challenges that face naval engineering analyses as a consequence of hardware and software improvements and of more sophisticated systems are also discussed.
The UNIX ™ operating system Virtual Protocol Machine (VPM) is a package of software tools that allows a wide variety of link-level data communications protocols to be implemented efficiently in a high-level language. ...
The UNIX ™ operating system Virtual Protocol Machine (VPM) is a package of software tools that allows a wide variety of link-level data communications protocols to be implemented efficiently in a high-level language. The resulting protocol implementations are independent of the particular communications hardware, the host machine architecture, and the host operating system, and therefore can be ported easily from one hardware/software environment to another. An extension to VPM, the Common Synchronous Interface (CSI), provides similar benefits for the higher-level protocol software that runs in the UNIX system host. The implementations of VPM use Programmable Communications Devices (PCDs) to off load the link-level communications processing from the host CPU. A high-level language protocol description is translated by a protocol compiler that runs on the host machine. The resulting module is then loaded into the PCD and executed. The other components of VPM are a transparent protocol driver that allows user processes to interact directly with a link-level protocol implementation, a realtime trace capability to facilitate debugging, and several utility programs. VPM has been implemented on several different PCDs and several types of host computers. VPM-based protocol implementations can be ported with little or no change from one VPM implementation to another. VPM and CSI greatly reduce host system overhead while producing maximum communications throughput. A number of different higher-level protocols and their link-level counterparts have been implemented in the UNIX system using CSI and VPM; among them are X.25, 3270 emulation, a synchronous terminal interface, and a facility for remote job entry to IBM hosts.
The generalized Urban Dynamics model of Forrester was applied to Harris County, Tex. The 40 variables changed were those considered to be "region dependent." The model was initialized with data froni the yea...
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The generalized Urban Dynamics model of Forrester was applied to Harris County, Tex. The 40 variables changed were those considered to be "region dependent." The model was initialized with data froni the year 1950. Statistical data for 1960 and 1970 were used to check the validity of the model. The statistical data used were obtained from the 1950, 1960, and 1970 censuses and from various county and city agencies. The results revealed that the model could be used as a planning tool for a specific region, as the final model appeared closely tuned to the county's major statistical variables. The lack of variables in the model which could be directly correlated with statistical data was thought to be the reason for deviations in the subvariables. Sensitivity of the model to a large number of variables was determined.
Machine learning is rapidly advancing nearly every field of science and engineering, and control theory is no exception. In particular, it has shown incredible promise for handling several of the main challenges facin...
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Machine learning is rapidly advancing nearly every field of science and engineering, and control theory is no exception. In particular, it has shown incredible promise for handling several of the main challenges facing modern dynamics and control, including complexity, unmodeled dynamics, strong nonlinearity, and hidden variables. However, machine learning models are often expensive to train and deploy, fail to generalize beyond the training data, and suffer from a lack of explainability, interpretability, and guarantees, all of which limit their use in real-world and safety-critical control applications. Sparse nonlinear modeling and control techniques are a powerful class of machine learning that promote parsimony through sparse optimization, providing data-efficient models that are more interpretable and generalizable and have proven effective for control. In this review, we explore the use of sparse optimization in the context of machine learning to develop compact models and controllers that are easy to train, require significantly less data, and make low-latency predictions. In particular, we focus on applications in model predictive control and reinforcement learning, two of the foundational algorithms in control theory.
The coming generations of wireless network technologies will serve, not only as a means of connecting physical and digital environments, but also to set the foundation for an intelligent world in which all aspects are...
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ISBN:
(数字)9789819925018
ISBN:
(纸本)9789819925001;9789819925032
The coming generations of wireless network technologies will serve, not only as a means of connecting physical and digital environments, but also to set the foundation for an intelligent world in which all aspects are interconnected, sensed, and endowed with intelligence. Beyond merely providing communication capabilities, future networks will have the capacity to "see" and interpret the physical world. This development compels us to re-imagine the design of current communication infrastructures and terminals, taking into account crucial aspects such as fundamental constraints and tradeoffs, information extraction and processing technologies, issues of public security and privacy, as well as the emergence of numerous new applications. This field of research is known as Integrated Sensing and Communications (ISAC), and it has ushered in a paradigm shift towards the omnipresence of radio devices.;This book provides the first comprehensive introduction to the ISAC theoretical and practical framework. Each chapter is authored by a group of world-leading experts, including over 10 IEEE Fellows. Readers can expect to gain both a broad overview and detailed technical insights into the latest ISAC innovations.
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