evaluation of operating system wikipedia

... ⊆ known procs ∧ dom childof ⊆ known procs ran childof ⊆ known procs ∧ ran childof = ran parent childof ∼ = parentof ∧ code owners ⊆ dom parentof code owners
={IdleProcRef } dom shares code
=∅ ... procs, the set of known process identifiers. By the invariant of the class, an identifier is an element of known procs if and only if it is not a member of freeids Therefore, every member of known procs ... handle the childof relation, which represents the process hier-archy in this model parent ? , child? : APREF childof
= childof ∪ (child?, parent?) DelChildOfProcess ∆(childof ) parent ? ,

Ngày tải lên: 23/07/2014, 23:20

... timequant? [...]... [18] The model of the last chapter serves as an existence proof : the formal modelling of an operating system can be performed The purpose of this chapter is to expand ... of the classical operating system kernel, hence the duplication of the figure2 4.3 Common Structures In this section, some structures common to many of. .. reader can gain some idea of ... Hardware Operating system kernels operate the system s hardware This subsection contains a number of definitions that will be used when defining the rest of the kernel The specifications of

Ngày tải lên: 23/07/2014, 23:20

... Linux, Microsoft’s NT, IBM’s mainframe operatingsystems and many real-time kernels In days of greater diversity, it was theapproach adopted in the design of Digital Equipment’s operating systems:RSTS, ... mecha-This approach to the design of operating systems can be traced back at least to the the operating system of Dijkstra et al [19] (It could be argued that the the system took many current ideas ... transferred to the process of specifying a kernel for a larger system Given the networking of most systems today, some of thedistinctions between real-time and general-purpose systems are, in any case,disappearing

Ngày tải lên: 23/07/2014, 23:20

... edition (TNM-7) of the AJCC/UICC TNM system [10], which was introduced in 2009, is a modified version of the 6th edition (TNM-6) of this system The major modifications of this new system are: stage ... staging system should be capable of accounting for these factors and the most important drawback of the TNM-7 staging system is the lack of incorporation of host and surgical factors Staging systems ... assess the validity of this new staging system for resectable HCC, revealed that this system was clearly capable of stratifying patients with stages I, II, and III in terms of 5-year survival

Ngày tải lên: 09/08/2014, 02:21

... metastasis: evaluation of an immobilization system for suppression of respiratory tumor movement and preliminary results Address: 1 Department of Radiology, Nagoya City University Graduate School of ... obtained in only 27% of the patients, and in the rest of the patients, suppression of tumor movement was not considered to be satisfactory Therefore, the use of the BodyFix system appeared to have ... BodyFIX system Therefore, it was concluded that the Bod-yFIX system does not significantly influence SpO2 levels in the majority of patients Clinical outcome of our patients in terms of antitumor

Ngày tải lên: 09/08/2014, 09:22

... sequential processes Trang 8Implementation of Processes (1)Fields of a process table entry Trang 9Implementation of Processes (2)Skeleton of what lowest level of OS does when an interrupt occurs Trang ... (2)Trang 48Scheduling in Batch Systems (1)An example of shortest job first scheduling Trang 49Scheduling in Batch Systems (2)Trang 50Scheduling in Interactive Systems (1)• Round Robin Scheduling ... functionality of kernel threads – gain performance of user space threads • Avoids unnecessary user/kernel transitions • Kernel assigns virtual processors to each process – lets runtime system allocate

Ngày tải lên: 18/10/2014, 15:30

... Trang 1Chapter 5 5.1 Principles of I/O hardware 5.2 Principles of I/O software 5.3 I/O software layers Trang 2Principles of I/O Hardware Some typical device, network, and data ... Software Layers Layers of the I/O Software System Trang 15Interrupt Handlers (1)• Interrupt handlers are best hidden – have driver starting an I/O operation block until interrupt notifies of ... Analysis of the influence of crashes on stable writes Trang 39Clock Hardware A programmable clock Trang 404 0Clock Software (1) Three ways to maintain the time of day Trang 41Clock Software (2)Simulating

Ngày tải lên: 18/10/2014, 15:30

... 12Single-Level Directory Systems • A single level directory system Trang 13Two-level Directory SystemsLetters indicate owners of the directories and files Trang 14Hierarchical Directory SystemsA hierarchical ... as a log Trang 36Example File Systems CD-ROM File Systems The ISO 9660 directory entry Trang 37The CP/M File System (1)Memory layout of CP/M Trang 38The CP/M File System (2)The CP/M directory ... hierarchical directory system Trang 15A UNIX directory treePath Names Trang 17File System ImplementationA possible file system layout Trang 18Implementing Files (1)(a) Contiguous allocation of disk space

Ngày tải lên: 18/10/2014, 15:30

... Standard (2)One block of the Y matrix and the DCT coefficients Trang 101 0The JPEG Standard (3) Computation of the quantized DCT coefficients Trang 11The MPEG Standard (1) Order of quantized values ... Trang 17Earliest Deadline First Scheduling (2) Another example of real-time scheduling with RMS and EDF Trang 181 8Multimedia File System Paradigms Pull and Push Servers Trang 19VCR Control Functions ... 27Placing Multiple files on a Single Disk (2) • Organ-pipe distribution of files on server – most popular movie in middle of disk– next most popular either on either side, etc. Trang 282 8Placing

Ngày tải lên: 18/10/2014, 15:30

... heuristic algorithm – under loaded receiver Trang 36Distributed Systems (1)Comparison of three kinds of multiple CPU systems Trang 37Distributed Systems (2)Achieving uniformity with middleware Trang 39Network ... System-Based Middleware (1)• Transfer Models (a) upload/download model (b) remote access model Trang 45File System-Based Middleware (2)Naming Transparency (b) Clients have same view of file system ... Trang 46File System-Based Middleware (3)• Semantics of File sharing – (a) single processor gives sequential consistency – (b) distributed system may return obsolete value Trang 47File System-Based

Ngày tải lên: 18/10/2014, 15:30

... Trang 1Operating System DesignChapter 12 12.1 The nature of the design problem 12.2 Interface design 12.3 Implementation 12.4 Performance 12.5 Project management 12.6 Prends in operating system ... Trade-offs (3)(a) Part of an uncompressed image with 24 bits per pixel (b) Same part compressed with GIF, 8 bits per pixel (c) The color palate Trang 12Part of an i-node cache Trang 13Software ... programmer team Trang 14The Role of Experience (1)Traditional software design progresses in stages Trang 15The Role of Experience (2)• Alternative design produces a working system – that does nothing

Ngày tải lên: 18/10/2014, 15:30

... Determine the effectiveness of airborne infection control of the combined PV-PE system in conjunction with background MV or DV systems in terms of the localized extraction of the contaminated exhaled ... Performance evaluation of PV-PE system in conjunction with background MV and DV systems — airborne infection control 6.1 Background As introduced in Chapter two, in the context of airborne ... background system The difference of PEE is only 0.05 and 0.02 for top-PE and shoulder-PE respectively This is because the mixing effect of MV disturbs the pulling effect of the PV-PE system Trang

Ngày tải lên: 10/09/2015, 09:21

... Comparison of iF between the three cases With a sense of the impact of the background ventilation system on the flow pattern of the indoor air, thus influencing the concentration of exhaled ... in higher exposure In view of these situations, the objective of this chapter explores performance of PE system alone in conjunction with background MV and DV in terms of airborne Trang 2infection ... Performance evaluation of PE system alone in conjunction with background MV and DV systems — airborne infection control 7.1 Introduction and Objective In Chapter 6, the combined PV-PE system was

Ngày tải lên: 10/09/2015, 09:21

... sketch of the measured case and photo of the experiment room Trang 7Figure 8.5 Sketch of the measured case and photo of the experiment room (a) Sketch of the measured Top-PE case (b) Sketch of the ... visualization than the experimental study, such as the tracking of the pathlines of PV air and transportation of pollutants in the room 8.2 Validation of CFD simulations 8.2.1 The geometrical model The ... assumption that this model is capable of simulating convective heat transfer of buoyancy-driven air flow as long as a reasonable value of Y+ is achieved The total number of cells is 6402744 Trial-and-error

Ngày tải lên: 10/09/2015, 09:21

... 1PERFORMANCE EVALUATION OF PERSONALIZED VENTILATION - PERSONALIZED EXHAUST (PV-PE) SYSTEM IN AIR-CONDITIONED HEALTHCARE SETTINGS YANG JUNJING (Bachelor of Eng., Tongji University; Master of Science, ... University; Master of Science, University of Reading) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF BUILDING NATIONAL UNIVERSITY OF SINGAPORE 2013 Trang 2i Declaration ... system Experimental study using two types of tracer gases have been conducted to evaluate the performance of this novel PV-PE system in conjunction with two different background ventilation systems

Ngày tải lên: 10/09/2015, 09:30

... This chapter consists of three parts, a holistic and critical review of PV, a review of local exhaust ventilation in the field of a ventilation type to reduce the transmission of infected air in ... at the two edges of the desk and allow for changes of the direction of the personalized air in both horizontal and vertical planes A typical office workplace, with a dimension of 5 m X 6 m X 2.5 ... with a diameter of 160 mm on the other side The total length of the nozzle was 140 mm High momentum of the PV air was used for this type of ATD so as to keep the core region of personalized airflow

Ngày tải lên: 10/09/2015, 09:30

... start of the experiments, a smoke generator was also used to choose the exact location for PE Figure 3.11 Location of Top-PE (left) and location of Shoulder-PE (right) 3.3.2Evaluation of the ... terminal device The secondary system consists of an Air Handling Unit (AHU), which delivers conditioned recirculated air as the ambient or background MV/DV system The primary system contains a main ... (IP) in a healthcare environment However, in the case of the experiments for Objective 1 involving the investigation of the ability of the PV-PE system to pull the PV air towards the Healthy Person

Ngày tải lên: 10/09/2015, 09:31

... the ability of personalized exhaust (PE) system in preventing the spread of contaminated air exhaled by infected people, another set of CFD simulation was conducted The dimensions of the simulated ... software The concentrations of exhaled air at the mouth of the Infected Manikin for all the cases are the same as shown in Figure 4.11 Figure 4.11 Concentrations of exhaled air at the mouth of ... (PV-PE) devices There are quite a few variations influencing the design of PV-PE system, such as the position of PE, the pressure of PE, background ventilation type, PV ATDs type etc Before building

Ngày tải lên: 10/09/2015, 09:31

... cells Inhibition of growth and promotion of apoptosis Observations of the clinical utility of realgar in the treatment of APL have triggered investigations into the mechanisms of action by which ... expression of TRAIL and TRAIL receptors and activation of BID in cells expressing mutant p53 [Akay C et al., 2004] ƒ Induction of the release of mitochondrial AIF to the cytosol, translocation of AIF ... with a median follow-up time of 23 months Even though the promising clinical efficacy of realgar in the treatment of APL was reported, the study of medicinal use of realgar is still in a very

Ngày tải lên: 11/09/2015, 16:03

... been pointed out (in Chapter 1) that file systems are not considered part of the kernel. File systems are certainly part of the operating system but not part of the kernel. They are considered privileged ... in operating systems research these days. Most “new” systems look like Unix or Windows. Pike makes the point that the domination of these systems serves to reduce the level of innovation in operating ... proof of the correctness of the model for semaphores. The second kernel is of approximately the complexity of kernels such as those built by Digital Equipment for the excellent operating systems...

Ngày tải lên: 23/07/2014, 23:20