فیلترها/جستجو در نتایج    

فیلترها

سال

بانک‌ها




گروه تخصصی











متن کامل


نویسندگان: 

Sahragard E. | Farsi H. | Mohamadzadeh S.

اطلاعات دوره: 
  • سال: 

    2025
  • دوره: 

    16
  • شماره: 

    4
  • صفحات: 

    692-705
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    17
  • دانلود: 

    0
چکیده: 

Semantic segmentation is a fundamental task in computer vision, requiring precise object delineation for applications such as autonomous driving and medical imaging. Traditional convolutional neural networks (CNNs) often struggle with capturing long-range dependencies and preserving fine Spatial details. It is the study's goal to make segmentation more accurate by adding adaptive Attention to the encoder and decoder stages of the U-Net-based architecture. The proposed network employs ResNet-50 as its backbone for efficient multi-level feature extraction. The encoder incorporates an Efficient Channel Attention Atrous Spatial Pyramid Pooling (ECA-ASPP) module to enhance its context representation. This module uses dilated convolutions and adaptive channel Attention to improve the collection of features at different sizes. There is also a Point-wise Spatial Attention (PSA) module in the decoder that dynamically gathers global contextual information while keeping fine-grained Spatial details. Extensive experiments on the Stanford Background Dataset demonstrate a consistent improvement across all segmentation categories. The best-performing model achieves a mean Intersection over Union (mIoU) of 78.65%, outperforming baseline approaches. Furthermore, evaluation on the Cityscapes dataset yields an mIoU of 80.46%, surpassing state-of-the-art methods such as DeepLabV3 and DANet. These results show that using adaptive Attention during both the encoding and decoding steps works well, finding a good balance between accurate segmentation and fast computing. The proposed network demonstrates strong potential for real-world applications requiring precise segmentation.

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

بازدید 17

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
نویسندگان: 

PENG J.Y. | LI H.X.

اطلاعات دوره: 
  • سال: 

    2005
  • دوره: 

    25
  • شماره: 

    3
  • صفحات: 

    311-322
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    132
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 132

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

GERSTLE D.S.

اطلاعات دوره: 
  • سال: 

    1999
  • دوره: 

    24
  • شماره: 

    5
  • صفحات: 

    257-261
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    68
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 68

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

EGENHOFER M.J. | FRANZOSA R.D.

اطلاعات دوره: 
  • سال: 

    1991
  • دوره: 

    5
  • شماره: 

    2
  • صفحات: 

    161-174
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    89
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 89

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

Faraji Hassan

اطلاعات دوره: 
  • سال: 

    1402
  • دوره: 

    13
  • شماره: 

    3
  • صفحات: 

    31-45
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    142
  • دانلود: 

    16
چکیده: 

A B S T R A C TFor choosing suitable place multiple methods are introduced, which examine the qualities, methods and patterns of location selection. The current methods use global approach and do not pay Attention to Spatial differences, environmental variation in variables, local changes modeled by local weighting indicators. It has been selected as a case study to evaluate the EMS center of Fars province and to evaluate the indicators of distance from the power plant, distance from logistics centers, industries, transportation terminals, hospitals, hotels and tourism, cities, rural areas and custom centers. has been used, using the AHP method to weight the qualities, and then for local weights, non-overlapping neighborhood filtering within a radius of 25 km are used and calculate the corresponding changes, quantity, ratio Presented in this article, the obtained weights, then the compute local weighted layers, and then local weight was multiplied in the normalized layers and the final layer were obtained. In the next step, it was combined and calculated to compare the data using the global method. The results of the two methods were transferred to the Points of the EMS and the results were analyzedExtended AbstractIntroductionIn geographical studies and Spatial planning, there are different approaches to choosing the right place for all kinds of applications and uses, and a process is followed to choose the best places. This process includes stating the research problem (cognition), choosing the criteria and preferences of decision makers and how to determine the weight of indicators, combining criteria (design) and finally, choosing the best option. In the current methods of Spatial decision, the criteria are given a fixed weight, while in geographical locations, the distribution of geographical phenomena is not uniform. In this case, Attention should be paid to the Spatial distribution pattern of geographical phenomena based on the principle of sensitivity of the range of changes, the size of the range of changes affects the outputs, and the data with a smaller range of changes also have a lesser effect on the output. The data with a larger range of changes will have a more significant effect on the output. Therefore, in Spatial analysis, indicators that have small changes are less important. Local models have been presented to model local changes in Spatial multi-criteria decision-making; in this research, the main issue is how to model the local changes that affect the expected outputs. MethodologyThe research process is based on multi-criteria Spatial decision-making methods (national and local). First, Spatial patterns of indicators were analyzed through exploratory analyzes of ESDA Spatial data. Then based on the review of the research criteria, the direct weighting method was used to calculate the weight of the indicators, and the experts were asked to specify the weight of the criteria in the range of 1 to 10. The opinions were combined, and the final weight was obtained. First, the data were Spatially modelled to model and calculate the local weights. Then Block Statistics Spatial filter without overlap was used to determine the neighborhood. The range of local changes, maximum and minimum values, were calculated, and local weights were obtained based on that. Finally, the information layers were descaled. After that, the unscaled criterion layers were multiplied by the national weights and the final national scores were obtained. In the next step, the data of the evaluated information layers (local and national) were transferred to the Points of emergency databases. Based on the analysis, the fit was done. Results and discussionGeneral or global weights pay Attention to the relative importance of indicators, which is the starting Point for calculating local weights. Based on the research results, the most critical indicators are industries, cities and hospitals, which are more important in the location of road emergency stations. However, in order to achieve better results, it is necessary to build a local weight layer. The results of the research show that the indicators' weight and the difference in the criteria (general weight) are not equal in the entire geographical area, and the areas with a larger range of changes have a higher coefficient.Because, unlike general weights that are obtained based on different methods, local weights are estimated based on the principle of sensitivity of the range of changes and are changed Spatially, and a fixed value is not considered for all areas. According to the research findings, the highest level in the general and local evaluation method corresponds to 0.5 to 0.7. Based on the local (geographic) weight method, it is less than the national or general method in the range of 0.9 to 1. Furthermore, this is due to the more precise nature of this method, which models the effects of local changes. To evaluate the compliance of the emergency centers with the final maps of suitability assessment, the information on the suitability maps was transferred to the map of the emergency center Points of Fars province. Based on the evaluation of 207 emergency stations, according to the general method, 14 percent are in the high group (0.9-1), and according to the local or geographical method (16.9), percent are in this group. ConclusionAt the level of space and geographical regions, phenomena and geographical complications are not uniformly distributed, some phenomena have a homogeneous distribution, and some have a heterogeneous distribution. On the one hand, the phenomena and decision issues are affected by the context in which they are formed and evolve; on the other hand, these phenomena are placed in the network of mutual relations. Furthermore, the results of the set of phenomena may differ from the results of the phenomena individually and separately; in this article, an attempt has been made to address the issue that in Spatial analysis and planning, it is necessary to pay Attention to geographical differences in decision-making. Furthermore, it should not be evaluated in general terms of Spatial decision problems; one of the methods of modelling these differences and Spatial changes is to consider the local weight of the criteria. Based on the research findings, local (geographical) and national analysis results are different and can better show these changes. On the other hand, the pattern of Spatial differences also has its Spatial pattern, and paying Attention to these differences in Spatial differences can be the subject of further studies. FundingThere is no funding support. Authors’ ContributionAuthors contributed equally to the conceptualization and writing of the article. All of the authors approved the content of the manuscript and agreed on all aspects of the work declaration of competing interest none. Conflict of InterestAuthors declared no conflict of interest. Acknowledgments We are grateful to all the scientific consultants of this paper.

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

بازدید 142

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 16 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
نویسندگان: 

VAHIDIASL M.Q. | FAGHIHI M.R.

اطلاعات دوره: 
  • سال: 

    2004
  • دوره: 

    28
  • شماره: 

    A2
  • صفحات: 

    277-288
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    306
  • دانلود: 

    0
چکیده: 

In the analysis of Spatial Point patterns, complete Spatial randomness (CSR) hypothesis, which is a restriction of a homogenous Poisson process to study region A, operates as a dividing hypothesis between “regular” and “aggregated” patterns. Meanwhile, many alternatives to CSR in aggregated patterns are extensions of homogenous Poisson processes themselves. Therefore, when the CSR hypothesis is rejected, results related to Poisson processes may be used to formulate plausible alternatives to CSR. In this paper, we propose a new statistic for testing CSR and then by applying it in conjunction with a notion of kernels of a Point pattern, we determine the “parents” of a Poisson cluster process when the CSR hypothesis is rejected and a Neyman-Scott process is assumed for the Point pattern under alternative hypothesis. We have made power studies for our test statistic by simulation, and have also surveyed the performance of our method on a certain Point pattern. Finally, the whole method is carried on certain real life data.

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

بازدید 306

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

    2011
  • دوره: 

    10
  • شماره: 

    13
  • صفحات: 

    19-21
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    420
  • دانلود: 

    0
چکیده: 

Objectives: The purpose of the present study was comparing visuo-Spatial Attention between children with Attention Deficit Hyperactivity Disorder-Inattentive (ADHD-I) type and normal children.Method and Material: In this cross-sectional study fifteen (7-10 years of age) children were classified with ADHD-I type and 15 normal children were matched for age, sex, and IQ. They were selected trough simple random sampling. Measurement tools were Wechsler Intelligence Scale for children 4th edition (WISC-IV), the Edinburgh Handedness Inventory and the Star Cancellation Test.Results: The results suggest that there is no significant difference between ADHD-I and normal children from the visuo-Spatial standPoint (p>0.05). But three ADHD-I children exhibited signs of unilateral neglect.Discussion: Although, in this study the visuo-Spatial Attention was not different between ADHD-I group and normal group, considering this form of Attention as an item in assessment and therapeutic interventions should not be neglected.

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

بازدید 420

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
نویسندگان: 

نشریه: 

NEURON

اطلاعات دوره: 
  • سال: 

    2020
  • دوره: 

    105
  • شماره: 

    3
  • صفحات: 

    577-587
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    54
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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

بازدید 54

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

عزیزیان علی

اطلاعات دوره: 
  • سال: 

    1399
  • دوره: 

    1
  • شماره: 

    1
  • صفحات: 

    35-47
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    341
  • دانلود: 

    119
چکیده: 

در تاریخ کشورها همواره بزرگانی وجود داشته اند که مردم هر عصر به وجود آن ها بر خود می بالند و به آنان افتخار می کنند. این بزرگان به واسطه ی اقداماتی که انجام داده اند به مرور زمان برای عموم مردم به شخصیت هایی اسطوره ای تبدیل شده اند. یکی از شخصیت هایی که نماد حکمت و خرد در جمع دیوانسالاران ایرانی بود و زندگی او تا حدی گرفتار افسانه و ابهام شده بزرگمهر حکیم است. در تاریخ و ادبیات ایران زمین جملات قصار حکمی، اخلاقی، فلسفی و همچنین اندرزها و حکایت های زیادی را به او نسبت داده اند که بر خرد و دانایی و میهن دوستی وی تأکید می کند. انسان ایرانی، ارزش های انسانی و متعالی خود را به نقل از بزرگانی عرضه داشته است که در تاریخ و در ساحت افسانه، نمونه و الگوی درایت، تدبیر و هوشمندی بوده اند. بدون تردید در این میان بزرگمهر حکیم از تابناکترین چهره ها محسوب می شود. وی از جمله قهرمانانی بود که به جمع شهیدان اندیشه پیوست و حالت اسطوره پیدا کرد. بنابراین ضرورت دارد شخصیت وی از افسانه تا واقعیت مورد کندوکاو قرار گیرد.

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

بازدید 341

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resourcesدانلود 119 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
نویسندگان: 

مدرسی فاطمه

اطلاعات دوره: 
  • سال: 

    1382
  • دوره: 

    -
  • شماره: 

    37 (2)
  • صفحات: 

    85-102
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1146
  • دانلود: 

    0
چکیده: 

فرّ کیانی از فریدون به کی قباد پیوست و سپس به شش نفر از پسران و نوادگان کی قباد منتقل شد: از کی اپیوه به کی کاوس، کیارش، کی پیشین، کی ییارش و سرانجام به کی سیاوش و کیخسرو. در شاهنامه و آثار سهروردی نیز همچون اوستا از تعلق یافتن فرّه به کیخسرو و بر آمدن کارهای بزرگ از وی و از فضایل قدسی و بی مرگی که به یاری فرّ نصیب کیخسرو شده و او را تا حد سالکی جهان بین و حکیمی متأله و صاحب کشف و شهود عروج داده، سخن رفته که در این مقال به اجمال بدان اشارت می رود.

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

بازدید 1146

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
litScript
telegram sharing button
whatsapp sharing button
linkedin sharing button
twitter sharing button
email sharing button
email sharing button
email sharing button
sharethis sharing button