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متن کامل


اطلاعات دوره: 
  • سال: 

    1389
  • دوره: 

    17
تعامل: 
  • بازدید: 

    331
  • دانلود: 

    113
چکیده: 

لطفا برای مشاهده چکیده به متن کامل (PDF) مراجعه فرمایید.

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 331

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 113
نویسندگان: 

SUN H. | VETRO A.

اطلاعات دوره: 
  • سال: 

    2007
  • دوره: 

    7
  • شماره: 

    2
  • صفحات: 

    172-159
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    120
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 120

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نویسندگان: 

ZHANG H. | ZHENG Y.

اطلاعات دوره: 
  • سال: 

    2009
  • دوره: 

    -
  • شماره: 

    -
  • صفحات: 

    1-6
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    117
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 117

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مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
اطلاعات دوره: 
  • سال: 

    1397
  • دوره: 

    34-3
  • شماره: 

    2
  • صفحات: 

    41-51
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    291
  • دانلود: 

    163
چکیده: 

در این نوشتار نمونه ی ناخواسته ی پدیده ی جویبار در لوله ی حائل موتور گرماصوتی استرلینگ مورد بررسی قرار می گیرد. شبیه سازی عددی جویبار داخل لوله، با حل یک بعدی معادله ی موج آغاز می شود. اثرات جویبار در حل یک بعدی ناپدید می شود؛ بنابراین جواب آن به عنوان شرایط مرزی جریان نوسانی لوله ی تقارن محور به کار گرفته می شود. این روش، امکان حل عددی را در اجزاء لوله ی حائل بدون دسترسی مستقیم به شرایط مرزی فراهم می کند. برای حذف جویبار، حل برای لوله ی مخروطی و صاف انجام شده است. حل فشار مبنای لوله ی حائل صوتی به وسیله ی نرم افزار شبیه سازی عددی با نگاه ساده ی ایجاد موج صوت رونده در مجرا، انجام می گیرد. نتایج نشان می دهد که شدت جویبار $ (S F) $ نسبت به حل آرام لوله ی صاف، در حالت آشفته، شیب دادن ملایم به دیواره در انتهای سرد لوله و جاذبه، به ترتیب به میزان 30، 12 و 70 درصد در کاهش اثر جویبار نقش داشته است.

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 291

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 163 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
اطلاعات دوره: 
  • سال: 

    2015
  • دوره: 

    1
تعامل: 
  • بازدید: 

    241
  • دانلود: 

    0
چکیده: 

VIDEO STREAMING IS GAINING POPULARITY AMONG MOBILE USERS. THE LATEST MOBILE DEVICES, SUCH AS SMART PHONES AND TABLETS, ARE EQUIPPED WITH MULTIPLE WIRELESS NETWORK INTERFACES. AT THE SAME TIME, ACCESSING THE INTERNET OVER PUBLIC WIFI AND 3G NETWORKS HAS BECOME PART OF OUR EVERYDAY LIVES. HOWEVER, STREAMING VIDEO IN WIRELESS ENVIRONMENTS IS OFTEN SUBJECT TO FREQUENT PERIODS OF REBUFFERING AND CHARACTERIZED BY LOW PICTURE QUALITY. IN PARTICULAR, ACHIEVING SMOOTH AND QUALITY-ADAPTIVE STREAMING OF LIVE VIDEO POSES A BIG CHALLENGE IN MOBILE SCENARIOS. IN ORDER TO MAINTAIN HIGH VIDEO STREAMING QUALITY WHILE REDUCING THE WIRELESS SERVICE COST, IN THIS PAPER, THE OPTIMAL VIDEO STREAMING PROCESS WITH MULTIPLE LINKS IS FORMULATED AS A MARKOV DECISION PROCESS (MDP). TO SOLVE THE MDP IN REAL TIME, WE PROPOSE AN ADAPTIVE, BEST-ACTION SEARCH ALGORITHM TO OBTAIN A SUB-OPTIMAL SOLUTION. TO EVALUATE THE PERFORMANCE OF THE PROPOSED ADAPTATION ALGORITHM, WE IMPLEMENTED A TESTBED USING THE ANDROID MOBILE PHONE AND THE SCALABLE VIDEO CODING (SVC) CODEC. BUILDING ON THE OBSERVATION THAT THE SUBJECTIVE VIDEO EXPERIENCE ON MOBILE DEVICES DECREASES WHEN QUALITY CHANGES ARE MORE FREQUENT THAN EVERY 1 TO 2 SECONDS, WE PRESENT A CLIENT-SIDE SCHEDULER THAT RETRIEVES SEGMENTS OF SEVERAL VIDEO ENCODINGS OVER HETEROGENEOUS NETWORK INTERFACES SIMULTANEOUSLY. THE RESULTS SHOW THAT OUR SCHEDULER REDUCES THE VIDEO INTERRUPTIONS AND ACHIEVES A HIGHER AND MORE STABLE AVERAGE QUALITY OVER MULTIPLE, TRULY HETEROGENEOUS WIRELESS INTERFACES.

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 241

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0
نویسندگان: 

NADERI BAHMAN | YAZDANI MEHDI

اطلاعات دوره: 
  • سال: 

    2015
  • دوره: 

    8
  • شماره: 

    18
  • صفحات: 

    61-69
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    292
  • دانلود: 

    0
چکیده: 

Although lot streaming scheduling is an active research field, lot streaming flexible flow lines problems have received far less attention than classical flow shops. This paper deals with scheduling jobs in lot streaming flexible flow line problems. The paper mathematically formulates the problem by a mixed integer linear programming model. This model solves small instances to optimality. Moreover, a novel artificial bee colony optimization is developed. This algorithm utilizes five effective mechanisms to solve the problem. To evaluate the algorithm, it is compared with adaptation of four available algorithms. The statistical analyses showed that the proposed algorithm significantly outperformed the other tested algorithms.

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 292

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مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
اطلاعات دوره: 
  • سال: 

    2021
  • دوره: 

    32
  • شماره: 

    1
  • صفحات: 

    133-141
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    23
  • دانلود: 

    0
چکیده: 

The Today’s digital world computations are tremendously difficult and always demands for essential requirements to significantly process and store enormous size of datasets for wide variety of applications. Since the volume of digital world data is enormous, this is mostly generated unstructured data with more velocity at beyond the limits and double day by day. In last decade, many organizations have been facing major problems to handling and process massive chunks of data, which could not be processed efficiently due to lack of enhancements on existing and conventional technologies. In this paper address, how to overcome these problems as efficiently by using the most recent and world primary powerful data processing tool, which is hadoop clean open source and one of the core component called Map Reduce, but which has few performance issues. This paper main goal is address and overcome the limitations and weaknesses of Map Reduce with Apache Spark.

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 23

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اطلاعات دوره: 
  • سال: 

    1395
  • دوره: 

    -
  • شماره: 

    26
  • صفحات: 

    35-44
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1152
  • دانلود: 

    255
چکیده: 

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شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 1152

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اطلاعات دوره: 
  • سال: 

    2024
  • دوره: 

    8
  • شماره: 

    1
  • صفحات: 

    59-82
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    2
  • دانلود: 

    0
چکیده: 

The integration of the internet with digital games has catalyzed significant transformations in the production, distribution, and consumption within the gaming industry. A notable catalyst in this evolution is the advent of live-streaming platforms, particularly Twitch. This study employs qualitative meta-analysis to scrutinize 19 scientific studies, aiming to synthesize a comprehensive interpretation of Twitch's role and influence in the digital gaming arena. Our analysis reveals Twitch's multifaceted impact: it is a driving force in the digital economy, facilitating new job creation, diverse revenue streams for industry participants, and a fertile ground for innovation and ideation. Twitch has revolutionized the landscape for game designers, producers, and developers, fostering independence and enhancing the quality and quantity of independent game productions. Moreover, it extends the lifespan of games in the market, resurrects interest in older titles, and assists consumers in making informed purchasing decisions. Importantly, Twitch serves as an educational platform, offering insights into specialized gaming industry skills, including design and programming. These roles and functions position Twitch as a pivotal player in the dynamic and burgeoning digital gaming industry.

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 2

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اطلاعات دوره: 
  • سال: 

    2024
  • دوره: 

    55
  • شماره: 

    4
  • صفحات: 

    663-682
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    9
  • دانلود: 

    0
چکیده: 

The nanofluid/air interface is practically used in enhancing heat transfer efficiency in thermal management systems, such as in cooling electronics and improving the performance of solar collectors. Additionally, it finds applications in advanced manufacturing processes and biomedical devices, where precise temperature control is crucial. The study investigates the instability of the interface between a Newtonian nanofluid and air in a rectangular setup. This instability arises when the two fluids flow at different velocities, leading to Kelvin-Helmholtz instability at the interface. The air is treated as a viscous, incompressible fluid due to its low Mach number, positioned above the nanofluid. The stability of the interface is determined based on the relative velocity of the fluid layers. The study reveals that various flow parameters, including viscosity ratio, density ratio, volume fraction, and nanoparticle diameter, influence the stability or instability of the interface. Four types of nanofluids are considered, and a comparative analysis is conducted. Interestingly, the nanofluid/air system is found to be more stable compared to the viscous liquid/air system. Sensitivity analysis is performed to examine the impact of different physical variables and their interactions on the critical relative velocity. It is observed that the critical velocity consistently exhibits positive sensitivity to the density ratio. Moreover, the magnitude of critical velocity sensitivities for the density ratio remains constant across all cases. The critical velocity demonstrates the highest positive sensitivity with respect to the parameter of air thickness, with this maximum sensitivity occurring when the air thickness equals 1 and the densities of both fluids are identical.

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 9

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesاستناد 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesمرجع 0
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