evaluation of operating system wikipedia
Formal Models of Operating System Kernels phần 10 pot
... been pointed out (in Chapter 1) that file systems are not consideredpart of the kernel. File systems are certainly part of the operating system butnot part of the kernel. They are considered privileged ... in operating systemsresearch these days. Most “new” systems look like Unix or Windows. Pikemakes the point that the domination of these systems serves to reduce thelevel of innovation in operating ... proof of the correctness of the model forsemaphores.The second kernel is of approximately the complexity of kernels such asthose built by Digital Equipment for the excellent operating systems...
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Formal Models of Operating System Kernels phần 9 potx
... Npgallocstart =0The value of 0 is completely arbitrary, as is now explained.Some systems map a virtual copy of the operating system onto the vir-tual address space of each user space (and some ... determine a number of properties of CCS and CSP processes, including observational equivalence andbisimilarity. The propositions concerning equivalence of the various versions of the subsystem were ... between the component processes of the subsystem, notin the specification of the components. The processes to be modelled do nothave properties suggestive of the use of the π-calculus (e.g., mobility),...
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Formal Models of Operating System Kernels phần 8 pot
... comprising the system- call library all send and receivemessages. Therefore, the rest of the proof must be in terms of the properties of the message-passing subsystem.The message-passing subsystem is ... of sharedpages(p)(sg), for some p and sg.Proof. Similar to the previous proof. ✷Proposition 134. IsLockedPage iff lpno? is a locked page; that is, iff lpno?is an element of lockedpages.Proof. ... being“in core”, hence the name of the variable, incore.Thepagecount counts thenumber of pages in each segment of each process. There is an a priori limit tothe number of pages in a segment and pagecount...
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Formal Models of Operating System Kernels phần 7 doc
... message contains the identifier of the sending process. Italso contains two natural numbers (elements of N). They denote the size of the data area and the size of the stack area that are, respectively, ... prove some fairly general properties of themessage-passing system. Proposition 112. The message-passing mechanism is synchronous.Proof. By the predicates of SendMessage and RcvMessage.If the ... bound to thevalue of currentp by sched.CurrentProcess. ✷Proposition 119. The receiver of a message is always the current process.Proof. By reasoning similar to the first paragraph of the previous...
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Formal Models of Operating System Kernels phần 6 pptx
... most significant aspect of this chapter’s model is that it actsas an existence proof. It is possible to define a formal model of an operating system kernel and to prove some of its properties. In ... of the current kernel.5.2 RequirementsThe requirement is to model an operating system kernel that is based uponthe exchange of messages between processes. The kernel should be an example of ... end of Pthan P.3. If the new value of pris the same as the old one, one of the two previousconditions will hold.Proof. By Proposition 21. The interesting case is case 3, whose proof followsfrom...
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Formal Models of Operating System Kernels phần 5 pps
... to determine all the children of a parent process.4.8 General ResultsThis final section contains the proof of a number of propositions that dealwith properties of the kernel.The propositions ... an idea of some of the other things that might need to be handled during termination).If a process is on disk when it is terminated (say, because of system ter-mination or because of some error ... enabling it to be represented withinthe system. As part of this, a test (proctab.CanGenPId)ismadeastowhetherthe system has reached its maximum number of processes. The schema is com-plicated...
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Formal Models of Operating System Kernels phần 4 pot
... descendant of the ancestor of the process just blocked.Proof. This requires the proof of the following lemma.Lemma 16. For any process, p, BlockProcessChildren implies that there areno children of ... closure of the childof relation; the complete set of descendants of a given process are represented by childof+(|{p?}|) for any process identifierp?. In BlockProcessChildren, ps is the set of descendants ... p,BlockProcessChildren ⇒ (∀ p1: APREF | childof (p1, p) ã p ran userqueue )Proof. The predicate of BlockProcessChildren contains an instance of MakeUnready inside the scope of the universal quantifier. The...
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The Duality of Memory and Communication in the Implementation of a Multiprocessor Operating System
... last 20 years operating systems and their environments haveundergone dramatic expansion in size, scope and complexity. The Alto operating system [22], a workstation operating system of the early ... Proceedings of the 11th Operating Systems Principles,November, 1987AbstractMach is a multiprocessor operating system being implemented at Carnegie-Mellon University. An importantcomponent of the ... Schwans, K., and Vegdahl, S.StarOS, a Multiprocessor Operating System for the Support of Task Forces.In Proceedings of the 7th Symposium on Operating System Principles, pages 117-129. ACM, December,...
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IMPROVING INFORMATION SYSTEM SUPPORTING MONITORING AND EVALUATION OF GREATER MEKONG SUBREGION SUSTAINABLE TOURISM DEVELOPMENT PROJECT IN VIET NAM
... Evaluation is implemented in 4 phases of investment process: Inception evaluation; Midterm evaluation; Completion evaluation; Impact evaluation or after project evaluation. Monitoring and Evaluation ... the system at the same point of time. - Ability of integrating into email system to destroy virus - Capacity of files, database and Operation System scan - Ability of integrating into Proxy system ... lack of good operation of monitoring and evaluation (M&E). In addition to that, one of the most important factors affecting effectiveness of M&E is the support of Information System...
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Reliability modeling and evaluation of sulaimani erbil electrical power system
... aspects of the various elements of the system [2].In general, the system is of two types (depending on the structure of the system) , a simple structure system and a complex structure system. ... subset of any given set of components which can cause system failure is known as a minimal cut set. A minimal cut set is a set of system components which, when failed, cause failure of the system ... Sulaimani-Erbil Electrical Power System Reliability Evaluation Fig.8 shows the single line diagram of the 132 kV systems for Sulaimani-Erbil electrical power system. For the purpose of reliability assessment,...
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Tài liệu Báo cáo khoa học: "Collecting a Why-question corpus for development and evaluation of an automatic QA-system" pdf
... chal-lenge is the evaluation: manual evaluation is adifficult, time-consuming process and not ap-plicable within efficient development of sys-tems. Automatic evaluation requires a cor-pus of questions ... the majority of cases (83% of thequestions) one of the workers replied with the NoA,the ones that answered did agree up to a point: of all the answers, 72% were such that all of their sen-tences ... fromwhich they could be extracted.One purpose of our project was to take part inthe development of QA systems by providing thecommunity with a new type of corpus. The cor-pus includes not only...
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Báo cáo khoa học: "An Evaluation of METAL: the LRC Machine Translation System" ppt
... describe the current stat~s of METAL, e~phasizing the results of the most recent post-edltors' evaluation, and will briefly indicate some future directions for the system. A 6-page German ... Bennett, "The LRC Machine Translation System: An Application of S~ate -of- the-Art Text and Natural Language Processing Techniques to the Translation of Technical Manuals, " Working Paper ... quality machine translation system, for market introduction in 1985. This paper wlll describe the curren~ statn/s o f METAL, including the results of the most recent evaluation, and will briefly...
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báo cáo hóa học:" From HIV diagnosis to treatment: evaluation of a referral system to promote and monitor access to antiretroviral therapy in rural Tanzania" doc
... access to HIV services.Development of the referral system The process of designing the referral system was led byresearchers from the Tanzanian National Institute of Med-ical Research, and included ... management of thereferral system, liaison with stakeholders, and the datacollection and analysis. He co-wrote the first draft of themanuscript. AW contributed to the design of the referral system, ... CentralPage 1 of 9(page number not for citation purposes)Journal of the International AIDS SocietyOpen AccessResearchFrom HIV diagnosis to treatment: evaluation of a referral system to promote...
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báo cáo hóa học:" Research Article Performance Evaluation of UML2-Modeled Embedded Streaming Applications with System-Level Simulation" pdf
... performance evaluation process consists of thefollowing steps. Some of the concepts of this and the nextsubsection have been reused and modified from the work in[13]:(1) selection of the evaluation ... precision of a single clock cycle. Cycle-accuracy guarantees that at any given clock cycle, the state of the simulated system model is identical w ith the state of the real system. System- level ... real-timeembedded systems can be represented as discrete eventsystems and propose an automated method for verification of dense time properties of such systems. The model of computation (MoC)...
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Báo cáo hóa học: " Research Article Performance Evaluation of WiMAX Broadband from High Altitude Platform Cellular System and Terrestrial Coexistence Capability" ppt
... (km)24681012141618202224Figure 14: UL CIR value of HAP system (CIRHT) interfered by theterrestrial system. CDF of CIRH of different frequency reusescheme in HAP cellular system 00.20.40.60.81Pr (CIR ... Networking121212121212121212121212121212121212121212121212121212121218181818181818181818181818181818181818181818181818181818181818181818181818182424242424242424242424242424242424242424242424242424242424CIRHT of HAP system interfered byterrestrial system (N= 4)−30−20−100102030Distance from SPP of HAP (km)−30 −20 −10 0 10 20 30Distance from SPP of HAP (km)24681012141618202224Figure ... ArticlePerformance Evaluation of WiMAX Broadband fromHigh Altitude Platform Cellular System and TerrestrialCoexistence CapabilityZ. Yang, A. Mohammed, and T. HultSchool of Engineering, Blekinge Institute of...
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