Sharif Digital Repository

In many cases even high-quality products cannot satisfy the customer needs and this leads to having a lower share of the market. To achieve this purpose, customer satisfaction and robust design are regarded simultaneously to achieve a better quality. Balance Score Card (BSC) is proposed as a technique that could potentially has a great improvement effect on customer satisfaction. Moreover, with a non-linear programming (NLP), a novel method for integrating RSM and BSC have been proposed to accede robustness in design. The opinions of the customers are regarded in every system design, parameter design and tolerance design. To validate the applicability of the proposed approach, the approach... 

Optimisation is ubiquitous and essential in almost all areas of engineering and computer science for the design and analysis of efficient systems and algorithms. Indeed, many engineering problems can be cast as optimisation problems, in which a decision must be made upon certain control parameters in order to maximise revenue or minimise an incurred cost in designing a system. Whereas deterministic optimization problems are formulated with known parameters, real-world problems almost invariably include parameters which are unknown at the time a decision is made. Stochastic optimisation is the approach for modelling optimization problems that involve uncertainty, and it has attracted a lot of... 

The performance evaluation involves a process by which the employees are periodically and officially evaluated. Major reasons of performance evaluation include, among others, identification of efficient employees and granting bonuses to them to create stimuli to improve their and other employees' performances. The main objective of performance evaluation constitutes study of people's performances in the organization in order for directors to take proper and required decisions to enhance both quantities and qualities of the employees' works. The performance evaluation is deemed to be a major critical function of the management of human resources to facilitate organizational effectiveness. In... 

The purpose of this research is the conceptual design of an aerial robot that has the ability to reach different locations without changing its horizontal attitude. The main missions of the aerial robots are monitoring and delivery, in which none of them requires the robot to leave its horizontal attitude. The main task of the robot is to deliver the goods to the specified points. In order to do this, it must have an appropriate container for carrying the cargo, high safety to prevent damage to the cargo and individuals, the ability to carry out missions when one of the subsystems exits, and the appropriate flight speed for Deliver cargo to the customer as fast as possible. All of the... 

Today, spark ignition internal combustion engines make up a large percentage of passenger car engines, so their performance improvement is important. Turbocharging of these engines, although is an appropriate method to enhance their specific power and improve their specific fuel consumption, but it has big problems such as the possibility of knock and increasing the NOx emissions in the engine. In this study, resolving these problems is intended by controlling the engine inlet charged air temperature to improve performance of the engine. For this purpose, the investigations are conducted experimentally as well as numerically. The experimental studies are carried out on a turbocharged... 

Wastewater treatment plants play an important role within the urban water cycle in protecting receiving waters from untreated discharges. In the developed and developing countries, Energy consumption of these units are 3 and 5 % of the electrical energy demand, respectively. As far as sustainable development is concerned, not only the reduction of WWTP’s energy consumption is mandatory, but also these units should produce energy. To this end, several techniques are available namely: energy audits, replacement of equipment and improvement of process efficiency. Moreover, Energy can be generated by converting biogas -from anaerobic digesters- to heat and power. Todays, Biogas is well-known as... 

Alzheimer’s disease (AD) is a neurodegenerative disease which results in synaptic depression and complete destruction in neurons in the final stages. Many pathogenesis has so far been attributed to AD but the most commonly explained pathomechanism is based on the amyloid cascade theory which results in formation of amyloid beta plaques outside and hyper phosphorylated neurofibrillary tangles of tau protein inside the neurons. One of the most well-known symptoms of AD is the disability to learn and form new memories and transform them into long term memory. The most commonly studied mechanism in memory formation, is the “long term potentiation”. Although many mechanisms and molecules are... 

In this study, we seek to evaluate the three factors of knowledge level, the rate of use and attitude of exporting companies to the services provided by Iran Trade Promotion Organization. A questionnaire was used to collect information and data from 68 active companies in different industries of the country. Questions are about the 8 support packages officialy provided by the trade promotion organization to help exporters. In this research, we first studied the importance of the subject and the theories presented in this regard, and then we examined the similar studies conducted in other countries. Afterwards, we describe the tools used to collect information and present the results of the... 

The annual increase in electricity consumption has led to several problems, including greenhouse gas emissions and global warming. Refrigeration systems are one of the main electricity consumers in the world. Ejector refrigeration systems use waste heat from industries or renewable sources such as solar energy to create the cooling effect. One of the main problems with these systems is the inefficiency of the cycle by the change of the ambient conditions including temperature rise. In ejector vapor compression refrigeration cycles, the compressor increases the pressure to an intermediate pressure. and the rest of the pressure increase is provided by the ejector. These systems can provide the... 

User comfort in wearable robots and precise limb tracking of the robots' links can be considered as general and significant indicators of the robots' performance. On the other hand, due to the kinematic mismatches between the human body and conventional wearable robots, which often occur due to various reasons such as the kinematic differences between the body and robot joints (e.g. the knee joint), it seems unlikely to achieve a robot in which user's limbs comfortably follow its link without tracking error. In this study, in order to evaluate and improve the performance of the robot, two performance indices: limbs tracking error index (TEI) and user discomfort index (DI) were introduced,... 

Appearance of CUDA architecture results in GPU introduction as a suitable platform for parallel processing. Massive usage of GPGPUs in various applications forces the manufacturers to produce this processor with different configurations based on their application demands. But always the design approach observes a ratio between processing capability and bandwidth of GPGPUs. In this way mostly in all GPGPU series the bandwidth increases with growth of GPGPU processing power. At first glance this ratio seems reasonable because more process needs more data. However this approach does not pay attention to the behavior of a wide range of workloads which do not need such a bandwidth. Mentioned...