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Search Results: 1 - 10 of 60 matches for " Hedieh SAJEDI "
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ContSteg: Contourlet-Based Steganography Method  [PDF]
Hedieh SAJEDI, Mansour JAMZAD
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.13022
Abstract: A category of techniques for secret data communication called steganography hides data in multimedia me-diums. It involves embedding secret data into a cover-medium by means of small perceptible and statistical degradation. In this paper, a new adaptive steganography method based on contourlet transform is presented that provides large embedding capacity. We called the proposed method ContSteg. In contourlet decomposi-tion of an image, edges are represented by the coefficients with large magnitudes. In ContSteg, these coeffi-cients are considered for data embedding because human eyes are less sensitive in edgy and non-smooth re-gions of images. For embedding the secret data, contourlet subbands are divided into 4×4 blocks. Each bit of secret data is hidden by exchanging the value of two coefficients in a block of contourlet coefficients. Ac-cording to the experimental results, the proposed method is capable of providing a larger embedding capacity without causing noticeable distortions of stego-images in comparison with a similar wavelet-based steg-anography approach. The result of examining the proposed method with two of the most powerful steganaly-sis algorithms show that we could successfully embed data in cover-images with the average embedding ca-pacity of 0.05 bits per pixel.
PRENATAL DIAGNOSIS IN ORGANIC ACIDEMIA
Hedieh SANEIFARD
Iranian Journal of Child Neurology , 2012,
Abstract:
Effects of Nutrients Foliar Application on Agrophysiological Characteristics of Maize under Water Deficit Stress
Nour Ali SAJEDI
Notulae Scientia Biologicae , 2010,
Abstract: To investigate effects of nutrients foliar application on agrophysiological characteristics of maize hybrid ‘KSC 704’ water deficit stress conditions, an experiment was arranged in a split plot factorial based on a randomized complete block design with four replications to the Research Station of Islamic Azad University-Arak Branch, Iran in 2007-2008. Main factors studied were four irrigation levels including irrigation equal to crop water requirement, water deficit stress at eight-leaf stage (V8), blister stage (R2) and filling grain stage (R4) in the main plot. Combined levels of selenium treatment (without and with application 20 gha-1) and micronutrients (without and with application 2 lha-1) were situated in sub plots. Results showed that water deficit stress decreased grain yield 19.7% in blister stage as compared with control. Using selenium increased relative content water at R2 and R4 stages significantly. Using selenium in water deficit stress condition increased measured traits except plant height as compared with treatment without selenium. A negative antagonistic interaction was found between selenium and micronutrients on some measured traits. Between treatments of water deficit stress, highest grain yield equal 6799.52 and 6736.97 kgha-1 was obtained from combined treatments of water deficit stress at eight-leaf stage+without selenium+without micronutrients and water deficit stress at eight-leaf stage+selenium+without micronutrients respectively which compared with treatment of irrigation equal to crop water requirement+selenium+microelements did not differ significant. According to the results of experiment, it is concluded that with micronutrients fertilizer spray under optimum irrigation and selenium spray under water deficit obtain optimum yield.
Geomagnetic disturbances may be environmental risk factor for multiple sclerosis: an ecological study of 111 locations in 24 countries
Sajedi Seyed,Abdollahi Fahimeh
BMC Neurology , 2012, DOI: 10.1186/1471-2377-12-100
Abstract: Background We noticed that a hypothesis based on the effect of geomagnetic disturbances (GMD) has the ability to explain special features of multiple sclerosis (MS). Areas around geomagnetic 60 degree latitude (GM60L) experience the greatest amount of GMD. The easiest way to evaluate our hypothesis was to test the association of MS prevalence (MSP) with angular distance to geomagnetic 60 degree latitude (AMAG60) and compare it with the known association of MS with geographical latitude (GL). We did the same with angular distance to geographic 60 degree latitude (AGRAPH60) as a control. Methods English written papers with MSP keywords, done in Europe (EUR), North America (NA) or Australasia (AUS) were retrieved from the PubMed. Geomagnetic coordinates were determined for each location and AMAG60 was calculated as absolute value of numerical difference between its geomagnetic latitude from GM60L. By an ecological study with using meta-regression analyses, the relationship of MSP with GL, AMAG60 and AGRAPH60 were evaluated separately. MSP data were weighted by square root of number of prevalent cases. Models were compared by their adjusted R square (AR2) and standard error of estimate (SEE). Results 111 MSP data were entered in the study. In each continent, AMAG60 had the best correlation with MSP, the largest AR2 (0.47, 0.42 and 0.84 for EUR, NA and AUS, respectively) and the least SEE. Merging both hemispheres data, AMAG60 explained 56% of MSP variations with the least SEE (R = 0.75, AR2 = 0.56, SEE = 57), while GL explained 17% (R = 0.41, AR2 = 0.17, SEE = 78.5) and AGRAPH60 explained 12% of that variations with the highest SEE (R = 0.35, AR2 = 0.12, SEE = 80.5). Conclusions Our results confirmed that AMAG60 is the best describer of MSP variations and has the strongest association with MSP distribution. They clarified that the well-known latitudinal gradient of MSP may be actually a gradient related to GM60L. Moreover, the location of GM60L can elucidate why MSP has parabolic and linear gradient in the north and south hemisphere, respectively. This preliminary evaluation supported that GMD can be the mysterious environmental risk factor for MS. We believe that this hypothesis deserves to be considered for further validation studies.
ACTION DURATION OF ATRACURIUM IN HYPERTENSIVE PREGNANT PATIENTS WHO RECEIVED MAGNESIUM SULFATE
P SAJEDI,S BORGHEIAN
Journal of Research in Medical Sciences , 2000,
Abstract: Introduction. Usually, infusion of intermittent doses of succinylcholin is used for relaxation of muscles in the preeclamptic pregnant women treated with magnesium sulfate during cesarian. section This drug has complications such as hyperkalemia, phase 11block, etc. On the other hand non depolarizing muscle relaxant in these patients should be used only in the presence of nerve stimulator and with careful titration. Methods. Duration of clinical action of a medium acting non depolarizing muscle relaxant "atracurium" with succinylcolin's infusion was studied in 86 preeclamptic pregnant women who received therapeutic doses of magnesium sulfate. Findings. Magnesium sulfate did not prolong clinical action of atracurium. Conclusion. Based on this study it can be concluded that administration of atracurium in the pregnant women who received therapeutic dose of magnesium sulfate in the absence of peripheral nerve stimulator is not contraindicated.
Torticollis as the Main Presentation in a Child with Russell-Silver Syndrome: A Case Report
Mohsen Javadzadeh,Hedieh Saneifard,Amir Hossein Hosseini
Case Reports in Pediatrics , 2012, DOI: 10.1155/2012/109416
Abstract: Russell-Silver syndrome is a genetic disorder the inheritance pattern of which is mostly sporadic. Some of the features of the syndrome are present at birth, and others appear in later years. The main clinical features include low birth weight, poor growth postnatally, short height, and discrepancies in size between the two sides of the body Abu-Amera et al. (2008), Binder et al. (2011). There is no statistical significant difference in prevalence between males and females. We report a case of Russell-Silver syndrome with intrauterine and postnatal growth retardation, triangular face, and body asymmetry, in addition to torticollis as a novel manifestation. In neck sonography, we found asymmetry of sternocleidomastoid muscles. In conclusion, we describe torticollis as a presentation of Russell-Silver syndrome.
Two models for the generalized assignment problem in uncertain environment
Hamidreza Haddad,Hossein Mohammadi,Hedieh Pooladkhan
Management Science Letters , 2012,
Abstract: The generalized assignment problem (GAP) is a unique extended form of the Knapsack problem, which is tremendously practical in optimization fields. For instance, resource allocation, sequencing, supply chain management, etc. This paper tackles the GAP in uncertain environment in which the assignment costs and capacity of agents are fuzzy numbers. Two models are presented for this problem and a novel hybrid algorithm is offered using simulated annealing (SA) method and max-min fuzzy in order to obtain near optimal solution. Computational experiments validate the efficiency of proposed method.
The Relationship between Dissociative Experiences and the Success of Treatment through Abstinence from Opioid-Use Disorders
Mohsen Kianpoor,Ahmad Ghanizadeh,Hedieh Badiei
Zahedan Journal of Research in Medical Sciences , 2012,
Abstract: Background: Dissociation is a defense mechanism by which people under stress detach their thoughts, emotions and behaviors from the normal stream of consciousness in order to protect themselves against the threats imposed on their ego. The phenomenon of dissociation is associated with a group of psychiatric disorders, including substance use disorders (SUDs), and leads individuals to incline towards drugs. This study examines the relationship between the dissociation symptoms prior to abstinence treatment and the abstinence success.Materials and Methods: 128 opioid dependent males were selected randomly and examined using Dissociative Experience Scale (DES) questionnaire and a self-administered questionnaire. After two months, the subjects were divided, in terms of abstinence success, into three groups of rehabilitated (successfully-rehabilitated), recurrence, and non-referral groups. The three groups were compared to each other with regard to the DES mean score, demographic characteristics, drug use history, self-destruction, and self-mutilation history, using statistical methods of χ2, t-test, and one-way ANOVA.Results: The results showed that 39% of the subjects obtained a dissociation score of 15 and above in DES scale. There was a significant negative correlation between the dissociation score and abstinence success (p=0.001). There was no significant relationship between the DES score and demographic factors such as education level, residential location, and marital status. Moreover, the treatment follow-up of individuals showed that there was no significant relationship among the three groups in terms of age and education level.Conclusion: The extent of dissociative phenomena in drug dependent individuals who decide to discontinue drug abuse is effective in the sense of treatment outcome. Hence, the individuals are recommended to be examined for dissociative symptoms prior to drug treatment, and receive the proper treatment.
Torticollis as the Main Presentation in a Child with Russell-Silver Syndrome: A Case Report
Mohsen Javadzadeh,Hedieh Saneifard,Amir Hossein Hosseini
Case Reports in Pediatrics , 2012, DOI: 10.1155/2012/109416
Abstract: Russell-Silver syndrome is a genetic disorder the inheritance pattern of which is mostly sporadic. Some of the features of the syndrome are present at birth, and others appear in later years. The main clinical features include low birth weight, poor growth postnatally, short height, and discrepancies in size between the two sides of the body Abu-Amera et al. (2008), Binder et al. (2011). There is no statistical significant difference in prevalence between males and females. We report a case of Russell-Silver syndrome with intrauterine and postnatal growth retardation, triangular face, and body asymmetry, in addition to torticollis as a novel manifestation. In neck sonography, we found asymmetry of sternocleidomastoid muscles. In conclusion, we describe torticollis as a presentation of Russell-Silver syndrome. 1. Introduction Russell-Silver syndrome (RSS) was first described in 1953; it is a genetically heterogeneous imprinting syndrome that affects approximately 1/50000 children [1]. This syndrome is characterized by severe intrauterine growth retardation (IUGR) accompanied by postnatal growth deficiency. The birth weight of affected infants is typically two or more standard deviations (SDs) below the mean, and postnatal growth is two or more SD below the mean for length or height [1]. Affected individuals typically have proportionately short stature, with normal head circumference. Some other features which are less common are fifth-finger clinodactyly, typical facial features with triangular faces characterized by broad forehead and narrow chin, and limb-length discrepancy that may result from hemihypertrophy with diminished growth of the affected side [2]. Several helpful diagnostic scoring systems have been developed for RSS, and the more recent studies of Netchine et al. [3] and Bartholdi et al. [4] focused primarily on phenotypic findings. Nonetheless, many persons with RSS lack typical clinical features and have a more subtle presentation that is not consistent in all patients. For these atypical cases who lack the cardinal features of this syndrome and the clinical diagnosis that may not be made with certainty, genetic tests may be used to help to confirm the diagnosis in a significant percent of patients. Though the above tests help in confirming the diagnosis in doubtful cases, there are no tests to definitely rule out the diagnosis [3, 4]. We describe a 10-year-old girl with all of the main clinical features of RSS. Along with the typical clinical findings, she had torticollis, which has not been described before in this syndrome even among
Is Breast Background Parenchymal Enhancement on MRI Related to BI-RADS Score and Follow-Up Rate?  [PDF]
Afsaneh Alikhassi, Hedieh Akbari, Seyedeh Nooshin Miratashi Yazdi, Sona Akbari Kia, Farzin Roozafzai
Advances in Breast Cancer Research (ABCR) , 2018, DOI: 10.4236/abcr.2018.71002
Abstract: Objective: We investigated the correlations between background parenchymal enhancement (BPE) and MRI interpretations with respect to short-interval follow-ups and biopsy rates. Methods: All accessible MRI examinations from 128 women during a limited time period in 2016 were evaluated. A blinded radiologist visually categorized BPE as minimal, mild, moderate, or marked. A BI-RADS category was also assigned. We used descriptive statistics to report the findings and chi-square and Fisher’s exact tests to compare categories. Results: Prevalence of minimal, mild, moderate, and marked BPE was 14.1%, 43.0%, 32.0%, and 10.9%, respectively. The short-interval follow-up rates were 22.2%, 27.3%, 26.8%, and 7.1% in women with minimal, mild, moderate, and marked BPE, respectively. BPE was not associated with the short-interval follow-up rate (p-value = 0.477). Biopsy rates were 22.2%, 27.3%, 22.0%, and 57.1% in women with minimal, mild, moderate, and marked BPE, respectively. Although there was no significant relationship between biopsy rates and BPE levels (p-value = 0.095) in the total population, these two factors were significantly associated in premenopausal women (p-value = 0.023) and in women of 30 - 39 years (p-value = 0.001). Conclusion: Higher BPE does not correlate with short-interval
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