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Journal: 

محیط شناسی

Issue Info: 
  • Year: 

    0
  • Volume: 

    38
  • Issue: 

    64
  • Pages: 

    79-92
Measures: 
  • Citations: 

    1
  • Views: 

    989
  • Downloads: 

    0
Abstract: 

آسیب پذیری طبیعی آبخوان را می توان امکان رسیدن آلاینده به آب زیرزمینی و انتشار در آن پس از آلوده شدن سطح زمین تعریف کرد. این ویژگی، خصوصیتی نسبی، بدون بعد و غیر قابل اندازه گیری بوده و نه ففط به ویژگی های آبخوان بلکه به خصوصیات زمین شناسی و هیدرولوژی منطقه نیز بستگی دارد. در زمینه بررسی آسیب پذیری آب زیرزمینی روشهای مختلفی ابداع شده اند که در این میان، روش شاخص و بویژه DRASTIC به دلیل سهولت اجرا جزء پراستفاده ترین روشها هستند. در روش DRASTIC هر مشخصه ای را که به طور بالقوه بر احتمال آلودگی تاثیرگذار باشد در یک مقیاس طبقه بندی کرده و پس از اعمال ضرایب مشخصه ها، نمره ای جهت ارزیابی آسیب پذیری ارائه می کند. نکته قابل توجه در این روش سلیقه ای بودن رتبه بندی و وزن دهی مشخصه هاست و می تواند سبب کاهش کیفیت نتایج شود. برای بهبود و اصلاح مدل DRASTIC پیشنهادهای زیادی را محققان ارائه داده اند. اکثر این محققان حذف مشخصه های کم اهمیت و یا اضافه کردن مشخصه های موثر، اصلاح ضرایب مدل و رتبه بندی مشخصه ها را پیشنهاد کرده اند.این تحقیق به منظور برطرف کردن ایرادهای ذکر شده و انتخاب مدل مناسب برای ارزیابی آسیب پذیری آبخوان به بررسی و مقایسه سه روش ترکیبی رگرسیون لجستیک، DRASTIC اصلاح شده و AHP-DRASTIC پرداخته و پس از جمع آوری مشخصه های ورودی، آسیب پذیری بر اساس مدل های مذکور محاسبه شد. در پایان به منظور انتخاب مدل مناسب از محاسبه ضریب همبستگی اسپیرمن بین غلظت نیترات و کلاس های آسیب پذیری استفاده شد. نتایج مبین دقت بالای روش AHP-DRASTIC نسبت به روشهای ترکیبی مطالعه شده در این تحقیق بود.

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Journal: 

MODIRIAT-E-FARDA

Issue Info: 
  • Year: 

    2007
  • Volume: 

    5
  • Issue: 

    17
  • Pages: 

    71-81
Measures: 
  • Citations: 

    0
  • Views: 

    1264
  • Downloads: 

    0
Abstract: 

One of the fundamental points in every research is considering history, fields& evolution of the subject which is known as literature review. Thus in order to study LOGISTICs it is essential to review conceptual& historical evolution surveys, LOGISTIC theories& concepts. Furthermore, a suitable perspective& approach should be acquired.Studying books, articles & researches demonstrates different paradigms have been developed in LOGISTIC field. There for, this paper attempts to review serous LOGISTIC paradigms. At the end, integneted LOGISTIC paradigm is presented for future researches.

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Issue Info: 
  • Year: 

    2021
  • Volume: 

    2
  • Issue: 

    1
  • Pages: 

    101-120
Measures: 
  • Citations: 

    0
  • Views: 

    66
  • Downloads: 

    10
Abstract: 

We develop a generalized distribution, namely, exponentiated half LOGISTIC log-LOGISTIC Weibull distribution. Several structural properties of the distribution including expansion of density, distribution of order statistics, Ré, nyi entropy, moments, probability weighted moments, quantile function, generating function, and maximum likelihood estimates were derived. A simulation study to examine the consistency of the maximum likelihood estimates was conducted. Finally, real data examples are presented to illustrate the applicability and usefulness of the proposed model.

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Issue Info: 
  • Year: 

    2015
  • Volume: 

    1
  • Issue: 

    1
  • Pages: 

    46-55
Measures: 
  • Citations: 

    0
  • Views: 

    1231
  • Downloads: 

    0
Abstract: 

Given that different factors in terms of port development and port management too easily review, but factors that support the is subject to variables outside the scope of the port authority. Term and long term objectives of this article are offer. The development of any port in a situation in which the related infrastructure such as land and infrastructure, local and regional facilities, industrial facilities, geographical location, environment a higher priority than other factors involved in the development of port priority and preferred choice for port The development of LOGISTICs activities in the Port LOGISTICs Park is dry.

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Author(s): 

MALEKI M. |

Journal: 

DIDGAH

Issue Info: 
  • Year: 

    2013
  • Volume: 

    -
  • Issue: 

    -
  • Pages: 

    40-72
Measures: 
  • Citations: 

    0
  • Views: 

    1210
  • Downloads: 

    0
Keywords: 
Abstract: 

While it is very easy to evaluate different factors of the port development in view of construction and management, supporting elements of the port are adherent to variables which are out of the control out of port authorities; therefore, this paper tries to recognize these elements, compare different port development models, select the best LOGISTIC and development model, and investigate the priority of creating some zones as developed areas in the regions separated from the ports which are capable of presenting advanced LOGISTIC services with the aim of easing movements and increase satisfaction of customers in long-term and short-term. Port development to a the large extent depends on the port location and infrastructures like authorized land, local and regional facilities, industrial centers, geographical situation, and environment play greater role than other indexes. The first reason for selecting Bandar-Anzali is its priority for the development of LOGISTIC activity zone (LAZ) and then the development of dry port (DR) and finally the LOGISTIC park (LP).

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Author(s): 

Ahmadipari m. | MORADI M.

Issue Info: 
  • Year: 

    2018
  • Volume: 

    6
  • Issue: 

    1 (21)
  • Pages: 

    37-46
Measures: 
  • Citations: 

    0
  • Views: 

    408
  • Downloads: 

    0
Abstract: 

With the development of information and communication in the last two decades, using computer networks at various levels and, as the result, the need of transferring digital images in this network have been considered important more than past. To protect images against unauthorized access, image encryp-tion is used. Many algorithms have provided to encrypt the image. In this study, a new algorithm for image encryption is designed and implemented. In the proposed method, a new, and powerful algorithm is present-ed for encrypting images. This is done through combining the LOGISTIC map functions chaos and Xor action and inspiriting from the Beness network. Test results also show that the proposed algorithm has a proper performance.

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Author(s): 

BEWICK V. | CHEEK L.

Journal: 

CRITICAL CARE

Issue Info: 
  • Year: 

    2005
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    112-118
Measures: 
  • Citations: 

    1
  • Views: 

    155
  • Downloads: 

    0
Keywords: 
Abstract: 

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

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Issue Info: 
  • Year: 

    2012
  • Volume: 

    23
  • Issue: 

    4
  • Pages: 

    291-299
Measures: 
  • Citations: 

    0
  • Views: 

    420
  • Downloads: 

    238
Abstract: 

In many industrial and non-industrial applications the quality of a process or product is characterized by a relationship between a response variable and one or more explanatory variables. This relationship is referred to as profile. In the past decade, profile monitoring has been extensively studied under the normal response variable, but it has paid a little attention to the profile with the non-normal response variable. In this paper, the focus is especially on the binary response followed by the bernoulli distribution due to its application in many fields of science and engineering. Some methods have been suggested to monitor such profiles in phase I, the modeling phase, however, no method has been proposed for monitoring them in phase II, the detecting phase. In this paper, two methods are proposed for phase II LOGISTIC profile monitoring. The first method is a combination of two exponentially weighted moving average (EWMA) control charts for mean and variance monitoring of the residuals defined in LOGISTIC regression models and the second method is a multivariate T2 chart to monitor model parameters. The simulation study is done to investigate the performance of the methods.

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Issue Info: 
  • Year: 

    2023
  • Volume: 

  • Issue: 

  • Pages: 

    97-103
Measures: 
  • Citations: 

    0
  • Views: 

    0
  • Downloads: 

    0
Abstract: 

This article discusses about researches on LOGISTICs efficiency. It deliberates knowledge on researches with LOGISTICs efficiency as topics that might be useful for future studies. Literature review is employed as the method. It was used systematically on 32 articles that discussed about LOGISTICs efficiency derived from three journal databases. Based on previous researches, they could be grouped into five main topics, which are LOGISTICs efficiency on product and measurement; framework, model and approach of LOGISTICs efficiency; LOGISTICs efficiency and supply chain; LOGISTICs efficiency in the perspective of customer and macroeconomics; LOGISTICs efficiency and environment. From all reviewed researches, studies on framework, model and the approach of LOGISTICs efficiency are considered as the most often topics being discussed and from all discussed researches of all categories, future potential studies are also suggested.

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

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Author(s): 

BOLOUKIAN ROUDSARI ARMAN

Journal: 

DIDGAH

Issue Info: 
  • Year: 

    2010
  • Volume: 

    -
  • Issue: 

    -
  • Pages: 

    3-34
Measures: 
  • Citations: 

    0
  • Views: 

    1165
  • Downloads: 

    0
Keywords: 
Abstract: 

To improve port function, LOGISTIC activity usage and providing this region in port hinterlands is very important. To provide this center and increase facilities from added value service, there can be a competition for his fact. LOGISTIC parks which are placed in port hinterlands play an important role as a link to attract local and global centers with added value to support port economic development. On this paper, consideration has been taken on effectiveness zones of port LOGISTIC center and quantitative function for LOGISTIC center on each zone. This process is based on two scenarios: existence and not existence of LOGISTIC center in a port. This center has an obvious influence on the circumference, traffic and port service, and can make infrastructures to improve the service. Because of new distribution and public economy, influence of this system on transportation division can be sensible. The function of this center on economic LOGISTIC zone can be predicted and evaluated by direct and indirect influence, cost consideration and profits on service level. To provide enough potential to improve traffic level and facility development, LOGISTIC center can be a good reason. The system efficiency in road traffic decrease and local transportation and cost decrease in order to invert LOGISTIC is emphasized. This paper shows that existence of LOGISTIC center can increase port efficiency and income and decrease transportation chain costs.

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