Papers by mohammadhossein rahmati
شناسایی ابعاد اثرگذاری هویت سازمانی بر استراتژی سازمان: رویکرد فراترکیب
هدف: هویت سازمانی اگرچه مفهوم تازه‌ای نیست، اما اخیرا مورد توجه پژوهشگران حوزه مدیریت استراتژیک ق... more هدف: هویت سازمانی اگرچه مفهوم تازه‌ای نیست، اما اخیرا مورد توجه پژوهشگران حوزه مدیریت استراتژیک قرار گرفته است. با توجه به پراکندگی پژوهش‌های صورت گرفته در حوزه ارتباط بین این دو مفهوم و با هدف ترسیم مسیری روشن برای پژوهشگران، هدف از انجام این پژوهش، شناسایی مفاهیم برجسته در برقراری پیوند بین هویت سازمانی و استراتژی سازمان براساس بررسی پژوهش‌های پیشین و ارائه یک چارچوب منسجم از اشکال اثرگذاری هویت سازمانی بر استراتژی سازمان است. روش: نوع پژوهش حاضر براساس هدف، توسعه‌ای-کاربردی، براساس ماهیت داده‌ها، کیفی و براساس روش‌های جمع‌آوری داده‌ها و اطلاعات، اسنادی است. روش انجام پژوهش، تحلیلی -توصیفی بوده و داده‌های کیفی از روش پژوهش کیفی فراترکیب جمع‌آوری می‌شود. در این پژوهش، از روش هفت مرحله‌ای باروسو و ساندلوسکی استفاده شده است. یافته‌ها: در اﯾﻦ ﭘﮋوﻫﺶ از ﻃﺮﯾﻖ ﺗﺤﻠﯿﻞ ﻣﺤﺘﻮا، از مجموع 414 متن اولیه شناسایی‌شده، درنهایت 11 مفهوم برجسته شامل، قدرت هویت، محدوده هویت، ضد-هویت، تاکتیک‌های مقابله، تابوی استراتژیک، ساختار شناختی جمعی، ابزار کاهنده ریسک، هویت همسو/ناهمسو، جهت‌گیری هویت سازمانی، هویت...
Facial expression recognition using sparse coding
Content based video retrieval using information theory
Support vector regression for rate prediction in distributed video coding
Mapping to optimal regions; A new method for multi-class classification task to reduce complexity
Comparing weighted combination of hierarchical clustering based on Cophenetic measure
An efficient steganographic framework based on dynamic blocking and genetic algorithm
Learning Inductive Riemannian Manifold in Abstract Form by Modeling Embedded Dynamical System
Team Identification, Sport Fandom Identity and Willingness to Verbal/Physical Aggressive Actions among Soccer Fans
Agreement/disagreement based crowd labeling
ABSTRACT
BACKGROUND: Literature mostly abounds with the impacts of drought conditions on the concentration... more BACKGROUND: Literature mostly abounds with the impacts of drought conditions on the concentration of non-structural compounds (NSC) and acids in peach fruits without distinction as to the direct effect of drought on fruit metabolism and its indirect effect through dilution. Moreover, there is a need to investigate the sensitivity of the fruit composition to progressive water deficit in semi-arid conditions, as well as the origin of variations in fruit composition -not only in carbohydrates and organic acids, but also in secondary metabolites such as polyphenols.
Prediction of the minimum spouting velocity by genetic programming approach
ABSTRACT A genetic programming (GP) algorithm is developed to estimate the minimum spouting veloc... more ABSTRACT A genetic programming (GP) algorithm is developed to estimate the minimum spouting velocity (U-ms) in the spouted beds with a cone base. In order to have a general model, five dimensionless variables including seven critical geometric and operating parameters of spouted beds, namely, column diameter, spout nozzle diameter, base angle, static bed height, particle diameter, particle density, and gas density, have been taken as model inputs. A general correlation including nearly all fundamental and operating variables has been obtained based on the GP approach. The U-ms values predicted by the GP are in fair agreement with those obtained by experiments, with a root-mean-square error of 0.1329 m/s. The model results show that GP can be used as an effective tool to provide relatively accurate information on minimum spouting velocity in conical spouted beds.
Yield and oil constituents of chamomile (Matricaria chamomilla L.) flowers depending on nitrogen application, plant density and climate conditions
ABSTRACT Although chamomile is found as a wild species throughout Iran, there is yet little infor... more ABSTRACT Although chamomile is found as a wild species throughout Iran, there is yet little information about cultivation of commercial cultivars of chamomile under various cultural practices in climatic conditions of Iran. In order to investigate the effects of different levels of nitrogen fertilization and plant densities on the yield and essential oil constituents of chamomile C.V. Bodegold flowers, this experiment was set up at the Ferdowsi University research field, Mashhad, Iran during 2006-2007. The experimental design was on the base of two-factor randomized complete blocks design (RCBD) with three replications. The first factor was plant density at four levels including D1 = 20, D2 = 25, D3 = 40 and D4 = 50 pl.m−2 and the second factor was nitrogen in the form of urea (% 46 nitrogen) at three levels, including N0 = control (absence of fertilization), N1 = 10 and N2 = 20 g.m−2. Observations were recorded on plant height, flower and disc florets diameter, dry flower yield, content (%) and yield of essential oil and main compounds of the oil. The crop responded significantly to different plant density. Plant height increased with increasing plant density from 20 pl.m−2 up to 50 pl.m−2, whereas the diameter of disc florets followed the reverse trend. Yield of dry flower and essential oil increased with plant density. Application of urea affected all observation of this study significantly. The maximum yields of dry flower and essential oil were observed at 50 pl.m−2 with 20 g.m−2 urea fertilization. The main oil compounds oil was including: α-bisabolol oxide A (53.45 ± 5.94 %), α-bisabolol oxide B (9.90 ± 3.03 %), α-bisabolone oxide A (5.24 ± 1.60 %), chamazulene (4.29 ± 2.78 %), (Z)-β-farnesene (2.75 ± 1.06 %) and spathulenol (0.81 ± 0.44 %).
A statistical blind Image steganalysis based on image multi-classification
Anomaly detection in structured/unstructured crowd scenes
Hybrid composite filters for general distortion-invariant optical pattern recognition
In the past, several different approaches to Synthetic Discriminant Function (SDF) filter design ... more In the past, several different approaches to Synthetic Discriminant Function (SDF) filter design have been proposed. These include: conventional SDFs which control the correlation values at the origin, Minimum Variance SDFs (MVSDFs) which minimize the noise sensitivity of the filters, Minimum Average Correlation Energy (MACE) filters which maximize the peak sharpness, and Linear Phase Coefficient Composite (LPCC) filters which use phasor addition and subtraction for inherent class discrimination. In this paper, we introduce a new family of SDF filters of which all the above are special cases. Each filter in this family is characterized by two parameters (alpha) 1 and (alpha) 2. Various choices of ((alpha) 1,(alpha) 2) lead to above special filters. For example, (alpha) 1 equals 1 and (alpha) 2 equals 0 leads to MACE LPCC filters which are hybrid versions of MACE and LPCC filters. This family of filters is evaluated using the Minimum Probability of Error (MPE) criterion and a data base of aircraft images. These simulation experiments confirm the superior performance of this filter family. Also, we observe the interesting result that the MPE is at its lowest not for one of the four special filters listed above, but for a combination of them.
Estimation of Probability Density Function by Dependence Tree Methods for Pattern Recognition Systems
Shape recognition and retrieval: A structural approach using velocity function
WG Kropatsch, M. Kampel, and A. Hanbury (Eds.): CAIP 2007, LNCS 4673, pp. 734 741, 2007. © Sprin... more WG Kropatsch, M. Kampel, and A. Hanbury (Eds.): CAIP 2007, LNCS 4673, pp. 734 741, 2007. © Springer-Verlag Berlin Heidelberg 2007 ... Shape Recognition and Retrieval: A Structural Approach ... Hamidreza Zaboli, Mohammad Rahmati, and Abdolreza Mirzaei
Field experiment was carried out at the Ferdowsi University Research Field, Mashhad, Iran during ... more Field experiment was carried out at the Ferdowsi University Research Field, Mashhad, Iran during 2007-2008, to determine the effect of different drying temperatures, microwave powers and natural method (shaded and sunny area) in Chamomile (Matricaria recutita L., Asteraceae) essential oil content, chamazolene content, drying time and drying rate. The experimental design was completely randomized block design having three temperatures: 50, 60 and 70 °C, six microwave powers: 100, 180, 300, 450, 600 and 900w and drying in shaded and sunny area, replicated thrice. The drying process was continued until the mass of the sample reduced to a moisture content of about 0.10 on a dry basis or 10% on a wet basis. The results indicate that different treatments of drying had a significant effect on the drying time and rate and essential oil and chamazolene content. The maximum essential oil content obtained at drying by the lowest temperatures and drying in shaded area. Whereas, higher drying temperatures of oven and microwave powers and drying in sunny area decreased the essential oil content. Maximum chamazolene content obtained at microwave drying (except 100w power) and natural method. Minimum chamazolene content was obtained at drying by oven.
Drying is one of the important pre-processing methods of medicinal plants after harvest that has ... more Drying is one of the important pre-processing methods of medicinal plants after harvest that has a major role in quantity and quality of their active substances. To determine the effect of different drying methods on drying time, essential oil content and composition of Savory (Satureja hortensis L.), the experiment was carried out during 2008. The experimental design was randomized complete block design with three replications and treatments were: two temperatures: 50°C and 70°C, six microwave powers: 100, 180, 300, 450, 600 and 900 w and drying in shade and under sun light. The drying process was continued until the mass of the sample reduced to a moisture content of about 0.10 on a dry weight basis or 10% on a wet weight basis. Results indicated that different treatments of drying method had significant effects on drying time and essential oil content. The maximum essential oil content (3%) obtained from drying at 70°C and drying in shade while minimum content (0.9%) obtained from drying under sun light. One hundred and 300 w microwave powers had an average content of essential oil (2.3%). Carvacrol content percentage in treatments of microwave drying was more than other methods as maximum percentage (63.9 %) was obtained from 300 w microwave drying with a little difference with 180 w microwave drying treatment. Drying by low microwave powers is recommended for Satureja hortensis L. due to the reduction of drying time and considerable maintenance of essential oil content and composition. Maximum γ-terpinene content (28.2%) obtained from drying at 70°C with a low difference with 50°C, 100 and 300 w microwave.
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Papers by mohammadhossein rahmati