performance optimization— fast faster

... alternative performance criteria Int J Thermophys., 2009, 30(5): 1724-1732 [23] Ust Y, Sahin B, Kodal A Performance optimisation of irreversible cogeneration systems based on a new exergetic performance ... (difference marketable price) on the optimal performances are discussed Finite-time thermodynamics (FTT) [7-18] is a powerful tool for analyzing and optimizing performance of various thermodynamic cycles ... [23] provided a new exergetic performance criterion, exergy density, which includes the consideration of the system sizes, and investigated the general and optimal performances of an irreversible...

Ngày tải lên: 05/09/2013, 14:58

... pp.175-184 The performance of PEM fuel cells is known to be influenced by many parameters, such as operating temperature, pressure and discharge current In order to improve fuel cell performances, ... cannot accurately predict performance outside of that range They are very useful for making quick predictions for designs that already exists They cannot be used to predict the performance of innovative ... and construct a mathematical model for investigating the performance of a PEM fuel cell at different operation variables to optimize its performance by changing some of its parameters Model validation...

Ngày tải lên: 05/09/2013, 14:58

... new exergetic performance criterion: exergetic performance coefficient Proc IMechE, Part A: J Power and Energy, 2007, 221(4): 447-458 [7] Tao G, Chen L, Sun F, Wu C Exergoeconomic performance optimization ... exchanger conductance, price ratios and the consumer-side temperature parameter on the exergoeconomic performance are studied Numerical examples According to equation (19) in Part of this paper, the ... used To simplify the problem, the constraint on total heat exchanger conductance is used for the performance optimization Assuming that the total heat exchanger conductance ( U T = U H + U L +...

Ngày tải lên: 05/09/2013, 14:58

... alternative performance criteria Int J Thermophys., 2009, 30(5): 1724-1732 [23] Ust Y, Sahin B, Kodal A Performance optimisation of irreversible cogeneration systems based on a new exergetic performance ... temperature ratio, pressure losses on the performance of the CHP plant Finite-time thermodynamics (FTT) [6-18] is a powerful tool for analyzing and optimizing performance of various thermodynamic ... [23] provided a new exergetic performance criterion, exergy density, which includes the consideration of the system sizes, and investigated the general and optimal performances of an irreversible...

Ngày tải lên: 05/09/2013, 14:59

... exergoeconomic performance for various irreversible heat pump cycles with variable-temperature heat reservoirs The results obtained herein include the optimal finite time exergoeconomic performance ... finite time exergoeconomic performance characteristic of an irreversible Carnot heat pump cycle with variable-temperature heat reservoirs become the finite time exergoeconomic performance characteristics ... performance and optimal thermal capacity rate matching between the working fluid and heat reservoirs are discussed The results obtained herein include the optimal finite time exergoeconomic performance...

Ngày tải lên: 05/09/2013, 15:28

... values of ψ ψ , the finite-time exergoeconomic performance bound ( ηπ ) lies between the finite-time thermodynamic performance bound and the reversible performance bound ηπ is related to the latter ... finite time thermodynamic performance bound at maximum thermodynamic output Some authors have assessed the influence of the heat transfer law on the finite time exergoeconomic performance optimization ... transfer law on finite time exergoeconomic performance of heat engines Energy, The Int J., 1996, 21(12): 1127-1134 Chen L, Sun F, Wu C Maximum profit performance of an absorption refrigerator...

Ngày tải lên: 05/09/2013, 16:10

... finite-time exergoeconomic performance bound of the endoreversible refrigerator approaches to the finite-time thermodynamic performance bound Therefore, the finite-time exergoeconomic performance bound ... endoreversible refrigeration cycles Moreover, performance analysis and optimization of the model are carried out in order to investigate the effect of cycle process on the performance of the cycles using numerical ... exergoeconomic performance characteristic of a steady flow endoreversible Dual refrigeration cycle When Cin = Cout1 = Cout → ∞ , equations (15) and (21) are the finite time exergoeconomic performance...

Ngày tải lên: 05/09/2013, 17:08

... the performance of the I/O scheduler, there is a dilemma: you can optimize read performance or write performance, but not both at the same time Optimizing read performance means that write performance ... Storage Performance The third element in the chain of Linux performance is the storage channel Performance optimization on this channel can be divided in two categories: file system performance ... really needs This is good, because it makes the process faster If the process already has some spare memory available, it can access it much faster when 93 94 C HAPTER PER FOR MA NC E OP TIMIZA...

Ngày tải lên: 19/10/2013, 02:20

... Server (Transact SQL) You get faster and easier development You get to use Web Services and XML (with Native XML capabilities using XML data types) The result is faster development, better development, ... and Locking 355 11 Architectural Performance Options and Choices 409 12 Monitoring Performance 421 Appendices A Syntax Conventions 445 B Database Scripts 447 C Performance Strategies and Tuning ... Server, immediately prior to execution So, it should execute a little faster because it executes in a form which is amenable to best performance in SQL Server SQL Server 2005 includes a new management...

Ngày tải lên: 14/03/2014, 16:20

... BigInteger.valueOf(computeIterativelyFaster(n)); } private static long computeIterativelyFaster(int n) { // see Listing 1–5 for implementation } } A call to computeRecursivelyFasterUsingBigIntegerAndPrimitive(50000) ... intermediate step, making execution faster, and sometimes much faster The Dalvik Just-In-Time (JIT) compiler is compiling the bytecode into native code, making your applications faster by having to interpret ... to have a better comment here? BigInteger fM = computeRecursivelyFasterUsingBigInteger(m); BigInteger fM_1 = computeRecursivelyFasterUsingBigInteger(m - 1); if ((n & 1) == 1) { // F(m)^2 + F(m-1)^2...

Ngày tải lên: 31/03/2014, 16:36

... at performance monitoring and the tools available to assist the database administrator Chapter provides a performance tuning aide-mémoire I really enjoy tuning databases and making them run fast ... Chapter 1: Introducing Performance Tuning and Physical Database Design 1.1 What is performance tuning? What is the goal of tuning a SQL Server database? The goal is to improve performance until acceptable ... taking an elusive performance problem, tracking it down, and fixing it I hope you, too, find the same level of enjoyment that I and that this book kick-starts your interest in performance tuning...

Ngày tải lên: 04/06/2014, 13:17

... efficiently allocate bandwidth to guarantee the QoS performance is essential in IEEE 802.16 networks In this paper, we focus on evaluating IEEE 802.16 performance with efficient bandwidth allocation ... and BE services We want to find out an optimal bandwidth allocation to optimize the performance Besides, the performance influenced by the network size is also investigated in our analysis The ... frame We also present the related works in performance optimization in IEEE 802.16 in Section In Section we present the system model while Section addresses performance analysis through our mathematic...

Ngày tải lên: 21/06/2014, 23:20

... off; fastcgi_pass unix:/var/run/php5-fcgi.sock; fastcgi_param SCRIPT_FILENAME /var/www/magento-site-name$fastcgi_script_name; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_param ... changes can help your Magento server to run faster By the end of this chapter, you might be surprised by what you will find out about hardware and performances Before upgrading your hardware, ... Description: ### END INIT INFO php5-fcgi $all $all PHP FastCGI PHP FastCGI # Author: AITOC PATH=/sbin:/usr/sbin:/bin:/usr/bin DESC="PHP FastCGI" NAME=php5-fcgi DAEMON=/usr/bin/spawn-fcgi...

Ngày tải lên: 22/07/2014, 21:52

... faster than NUMPROC(NOPFD), with a range of 20% faster to equivalent On the average, NUMPROC(PFD) was 1% faster than NUMPROC(MIG), with a range of 9% faster to equivalent On the average, NUMPROC(MIG) ... instead of with VALUE clauses)  Performance considerations using OPTIMIZE: On the average, OPTIMIZE(STD) was 1% faster than NOOPTIMIZE, with a range of 12% faster to equivalent On the average, ... considerations using FASTSRT: One program that processed 100,000 records was 35% faster when using FASTSRT compared to using NOFASTSRT 45 NUMPROC - NOPFD, MIG, or PFD – of  Using the NUMPROC(PFD) compiler...

Ngày tải lên: 23/10/2014, 20:10

... able to meet the enterprise’s performance demand To fill the performance gap and to optimize the cost and reliability, the storage system that can provide aggregated performance of multiple HDDs ... 2.3.1 Performance Study by Simulation The physical measurement performs testing and collects measurements performance data of a running system By analyzing the relationship between the performance ... performance requirement of enterprise applications Besides RAID technology, the interconnection between the Hard Disk Drives (HDDs) and the RAID controller plays an important role in a high performance...

Ngày tải lên: 26/11/2015, 22:57

... 16GB so I set it to 10GB • Use values you need Larger values may decrease performance • sort_buffer_size of 512K will be faster than 16M for small sorts Consider per session variables • Optimize ... Memory buffers are very important for performance • innodb_buffer_pool_size, key_buffer_size • Balance appropriately between storage engines • Note Innodb performance is more affected by buffer ... allocate too much memory • Using less memory than available reduces performance • Using more memory than you have can lead to even worse performance or crashes • Never let your DB box to swap actively...

Ngày tải lên: 23/06/2016, 10:14

... condenser is quite harmful to the overall performance of the still A computer simulation model is presented by [13, 14] for studying the steadystate and transient performance of a multi-stage stacked ... Fathalah K., Shams J., Sabbagh I Performance of multiple effect diffusion stills Desalination 1984, 51(2), 183-199 [9] Adhikari R.S., Kumar A., Sodha M.S Thermal performance of a multi-effect diffusion ... in the literature by [3-5] The disadvantage of basin solar stills includes their relatively low performance due to excessive heat losses to the ambient, resulting in the lower thermal efficiency...

Ngày tải lên: 05/09/2013, 16:11

... 119 127 Portfolio performance 5.1 Standard performance measures 5.1.1 The Capital Asset Pricing Model 5.1.2 The three standard performance measures 5.1.3 Other performance measures ... measures 5.1.4 Beyond the CAPM 5.2 Performance decomposition 5.2.1 The Fama decomposition 5.2.2 Other performance attributions 5.2.3 The external attribution ... strategies 11.2 Hedge fund performance 11.2.1 Return distributions 11.2.2 Sharpe ratio limits 11.2.3 Alternative performance measures 11.2.4 Benchmarks...

Ngày tải lên: 04/12/2013, 23:54

... Client Bottlenecks 522 Network Performance 523 Application Performance 523 Presentation Performance 524 Client Hardware Performance 524 Summary ... help you in investigating performance problems Chapter 7, Performance Engineering Starts at the Design Stage,” explains the holistic approach to performance engineering Performance should be engineered ... information in our home computers But performance does not mean buying the biggest and the fastest; you have to get the most out of what you’ve got Buying a bigger or a faster server may be a waste if,...

Ngày tải lên: 24/01/2014, 04:20

... Networking were conducted to evaluate the performance of the CFO estimation using CAZAC sequences We first compare the performance using CAZAC sequences with the performance using two other sequences ... In this section, we use computer simulations to study the performance of the CFO estimation using CAZAC sequences and demonstrate the performance gain achieved by using the optimal training sequences ... STF has a very high error floor above MSE of 10−3 The performance using CAZAC sequences is much better In low to medium SNR regions, the performance is very close to the single-user CRB An error...

Ngày tải lên: 21/06/2014, 05:20