Container ports have been faced under increasing development during last 10 years. In such systems, the container transportation system has the most important effect on the total system. Therefore, there is a continuous need for the optimal use of equipment and facilities in the ports. Regarding the several complicated structure and activities in container ports, this paper evaluates and compares two different storage strategies for storing containers in the yard. To do so and covering all actual stochastic events occur in the system, a simulation model of the real system was developed using loading and unloading norms as important criteria to evaluate the performance of Shahid Rajaee container port. By replicating the simulation model and considering the two strategies, it has been shown that using a marshaling yard policy has a significant effect on the performance level of the port which leads to cost reductions. پرونده مقاله

The dramatic increasing of sea-freight container transportations and the developing trend for using containers in the multimodal handling systems through the sea, rail, road and land in the present market cause some challenges to the general managers of container terminals such as increasing demand, competitive situation, new investments and expansion of new activities and the need to use new methods to fulfil effective operations both along quayside and within the yard. Among these issues, minimizing the turnaround time of vessels is considered to be the first aim of every container port system. Regarding the complex structure of container ports, this paper presents a simulation model that calculates the number of trucks needed in Shahid Rajaee Container Port for handling containers between the berth and the yard. In this research, some important criteria such as vessel turnaround time, gantry crane utilization and truck utilization have been considered. By analyzing the results of the model, it will be shown that increasing the number of trucks to 66 units has a significant effect on the performance indices of the port and can increase the capacity of loading and unloading up to 10.8%. پرونده مقاله

چکیده تحقیق حاضر به دنبال بررسی وضعیت هویت اجتماعی دانشجویان دانشگاه آزاد اسلامی تهران شرق و تأثیر استفاده از مطبوعات دانشگاه آزاد اسلامی بر این هویت بوده است. از روش پیمایشی و ابزار پرسشنامه استفاده شد. جامعه آماری شامل کلیه دانشجویان دانشگاه ازاد اسلامی تهران شرق که با استفاده از فرمول کوکران تعداد 270 نفر به عنوان حجم نمونه انتخاب شدند. روش نمونه گیری هم مطبق یا طبقه بندی بود. یافته های تحقیق نشان داد که: در مجموع دانشجویان این دانشگاه چندان تحت تأثیر روزنامه های دانشگاه برای شکل گیری هویت اجتماعی و یا تقویت آن نیستند. به عبارت دیگر بن نظر می رسد با توجه به گسترش و نفوذ شبکه های اجتماعی مجازی در بین دانشجویان دیگر مراجعه چندانی به روزنامه ها ندارند که از آنها تأثیرپذیری داشته باشند. اما با این وصف از آنجا که دانشجویان برای پیگری امور دانشجویی خودشان بعضا به روزنامه های فرهیختگان و آفرینش مراجعه می کنند لذا تاحدودی از این روزنامه ها تأثیرپذیری داشته اند هر چند میزان آن چندان قابل توجه نبوده است. پرونده مقاله