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Issue Info: 
  • Year: 

    1395
  • Volume: 

    23
Measures: 
  • Views: 

    356
  • Downloads: 

    0
Abstract: 

با در نظر گرفتن اهمیت بهبود دقت تصحیح هندسی تصاویر ماهواره ای توسط مدل های ریاضی، یکی از گام های مهم در تولید اطلاعات مکانی دقیق از تصاویر بهبود دقت تصحیح هندسی خواهد بود. در این مطالعه با بررسی های آماری دقیق بر روی انتخاب نقاط کنترل جهت بهبود دقت تصحیح هندسی دقیق تصاویر ماهواره ای و نظارت بر انتخاب نقاط کنترل مناسب در فرآیند تصحیح توسط روش های آماری و تحلیل نتایج حاصل، از بهینه سازی پارامترهای موثر در مدل چند جمله ای سه بعدی استفاده شده است.این آزمون آماری بر روی تصاویر ماهواره آیکونوس و نیز تصویر سنجنده OLI ماهواره لندست 8، صورت گرفت. سپس با معرفی و بررسی دو عامل توپوگرافی و فاصله از مرکز تصویر، به عنوان عوامل موثر بر دقت نقاط کنترل و مطالعه رفتاری و کنش آنها بر روی دقت نقاط، حد آستانه ای بر مبنای کنش دو عامل ذکر شده جهت تصحیح هندسی، به عنوان ماکزیمم خطا برای نقاط کنترل معرفی شد که با حذف نقاط دارای خطای بیشتر از حد مجاز، از روند محاسبات، بهبود دقت نهایی تصحیح هندسی را به همراه دارد. سرانجام با مقایسه ای که صورت گرفت، دقت بدست آمده از روش پیشنهادی مشابه و یا حتی بهتر نسبت به دقت های حاصل از توابع رشنال با ضرایب بالا بوده است. بنابراین با تعیین حدآستانه 16 در واحد متر، برای تصویر سنجنده OLI ماهواره لندست8، منطقه مورد مطالعه دقت نهایی تصحیح هندسی از 18.76 به عدد 15.88 برای نقاط کنترل تقلیل پیدا کرد. دستیابی به دقت های مطلوب بسته به شرایط پروژه های تصحیح هندسی در مناطق مختلف به عوامل مختلف وابسته می باشد لذا می توان با حذف نقاط دارای خطا از روند محاسبات بر اساس شرط کمترین مربعات بهبود دقت نتایج را شاهد بود.

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

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Author(s): 

EBRAHIMIAN A.A.

Journal: 

Payesh

Issue Info: 
  • Year: 

    2006
  • Volume: 

    5
  • Issue: 

    2
  • Pages: 

    123-130
Measures: 
  • Citations: 

    0
  • Views: 

    2983
  • Downloads: 

    0
Abstract: 

Objective(s): The aim of this study was to measure night shift nurses attention rate.Methods: 60 nursing personnel of Damghan Hospitals were randomly selected. Between 4-5 a.m at the work location of nurses, the level of attention was measured by the Bonardel Test. The test was repeated for 3 times at one-month intervals.Results: The results showed that the mean attention rate of nurses at first time was 0.23, at the second time 0.30 and at the thired time 0.30. There were no significant association between the attention range and either gender or educational level of respondents. Conclusion: The mean attention rate in night work nursing personnel is poor. There is need to increase attention rate in night work nursing personnel.

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

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Author(s): 

KHALILI H. | RAD M.

Issue Info: 
  • Year: 

    2011
  • Volume: 

    3
  • Issue: 

    1 (7)
  • Pages: 

    57-62
Measures: 
  • Citations: 

    0
  • Views: 

    734
  • Downloads: 

    0
Abstract: 

Background and Objective: Sphygmomanometers are instruments necessary for the basis of blood pressure measurement, it is well established that this device especially when is used in general practice may often be inaccurate and may cause errors in the measurement of accurate blood pressure. In this study we carried out an analysis of all aneroid and mercury sphygmomanometers currently in use in Sabzevar hospitals for their accuracy and physical condition.Materials and Methods: In this descriptive cross sectional study, all sphygmomanometers currently in use in Sabzevar hospitals were tested. A total 63 sphygmomanometers were compared with a standard mercury sphygmomanometer. Deviation of the hand of the aneroid sphygmomanometers and the mercury level of the mercury sphygmomanometers at rest were studied. The drop in pressure from 300mmHg was studied after one minute. SPSS 11.5 software and descriptive statistics were used to describe the data.Results: 50 (79.4%) out of 63 sphygmomanometers were not level of reference zero at rest. 88.9% of the sphygmomanometers had a pressure loss of more than 15 mmHg in one minute, when the cuff was inflated to 300mmHg around a can – with a circumference of about 32 cm. the mean of difference between the sphygmomanometers and the standard sphygmomanometer in the 100 mm level was 6.67 mmHg. 54% of the sphygmomanometers showed a difference of more than 4 mmHg with the standard sphygmomanometer.Conclusion: Most in use sphygmomanometers were not accurate and must either be calibrated or must be out of use. We recommend that all hospitals need to have procedures in place for the regular calibration of their sphygmomanometers.

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

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Issue Info: 
  • Year: 

    1377
  • Volume: 

    -
  • Issue: 

    7
  • Pages: 

    33-52
Measures: 
  • Citations: 

    1
  • Views: 

    300
  • 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: 

    1395
  • Volume: 

    3
Measures: 
  • Views: 

    339
  • Downloads: 

    0
Abstract: 

لطفا برای مشاهده چکیده به متن کامل (PDF) مراجعه فرمایید.

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

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    11
  • Issue: 

    3
  • Pages: 

    343-360
Measures: 
  • Citations: 

    0
  • Views: 

    694
  • Downloads: 

    0
Abstract: 

The aim of this study was to investigate the effect of handedness and task difficulty on effective target width and temporal accuracy of the Fitts’ speed-accuracy tradeoff task. The present study was semi-experimental and the tools used included Edinburgh handedness questionnaire, light pen, speed-accuracy measurement device, laptop, chronometer, and metronome. The statistical population consisted of students aged between 14 and 15. The sample included 20 students who participated in this study by convenience sampling method. They were divided into two groups: left-hand and right-hand (each group 10 subjects). Each participant performed 4 trials (each trial 30 seconds) of dual target tapping task in rhythm with the metronome sound. The trials consisted of two easy and difficult tasks and each subject performed each task with dominant and not-dominant hands in rhythm with the metronome sound set up at 300 milliseconds. For statistical analysis of data, variance analysis with repeated measures was used at the significance level of 0. 05. The results showed that in dominant hand, the handedness and difficulty of the task had no significant effect on the effective width of the target (P=0. 973, P=0. 611). Also, the handedness did not affect the average time lag (P=0. 135, P=0. 785), but in non-dominant hand, the average time lag was more for the difficult task than the simple task (P=0. 001). In difficult tasks, participants seem to be trying to keep the spatial error rate constant by reducing the speed of the movement and to sacrifice speed for the spatial accuracy. Also, the time error (mean lag) is more influenced by the difficulty of the task than the handedness.

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

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Author(s): 

MORTAZAVI F.A.S. | AKABERI A.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    13
  • Issue: 

    5
  • Pages: 

    45-51
Measures: 
  • Citations: 

    0
  • Views: 

    7043
  • Downloads: 

    0
Abstract: 

Introduction: Estimation of delivery date based on last menstrual period and ultrasound is common in prenatal care. The aim of this study was to compare the accuracy of Naegel’s rule, Naegel’s revised rule and ultrasound in estimation of delivery date.Methods: This cross-sectional study was done on 540 pregnant women hospitalized in Mobayyeni Hospital in Sabzevar (2007-2008) due sign of to labor. Estimated delivery date was calculated based on three methods and difference between these and ture date of labor calculated. Data was analyzed by descriptive statistical indices, Pearson correlation and T-test using Spss15. Results: Results showed that delivery happened in 6.3, 6.3 and 6.7 percent of women just on the stimated date by Naegel’s rule, Naegel’s revised rule and ultrasound respectively and delivery happened in 51.9, 67.2 and 60.7 percent of them until the estimated date. The difference between true date and the estimated date by Naegel’s rule and ultrasound were correlated significantly with fundal height and birth weight (p<0.001). Post term delivery rates were 0.4, 1.9 and 0.6 percent respectively, based on ultrasound reports, Naegel’s rule and Naegel’s revised rule. Conclusion: Naegel’s rule is more accurate in prediction of delivery date, compared to other similar studies. Using ultrasound prolongs the period preceding the beginning of labor. Using Naegel’s revised rule strongly brings better results.

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

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Issue Info: 
  • Year: 

    2009
  • Volume: 

    13
  • Issue: 

    6 (66)
  • Pages: 

    543-546
Measures: 
  • Citations: 

    0
  • Views: 

    4147
  • Downloads: 

    0
Abstract: 

Background: Hydatidiform mole is the commonest type of gestational trophoblastic diseases. Diagnosis of molar pregnancies is essential since molar pregnancies might be associated with maternal complication and would result in malignant trophoblastic disease. Recently, there has been a significant change in clinical presentation of hydatidiform mole due to use of ultrasound in early pregnancy before onset of systemic manifestations. The aim of this study was to assess the accuracy of systemic ultrasound in early diagnosis of molar pregnancies.Materials and Methods: This was a review of patients with molar pregnancies admitted to Mahdieh hospital from 2001 to 2006. Women with histologically-proven hydatidiform moles were evaluated by their age, gestational age, clinical manifestations and ultrasound findings. All data were analyzed with SPSS. The sensitivity and positive predictive value of ultrasound in diagnosis of hydatidiform mole was calculated.Results: The mean mother's age was 24.84±6.26 years old. The mean gestational age at the time of evacuation was 12.3±3.85 weeks. The most common symptom was vaginal bleeding (76.2%). Basically, there were 49.5% of cases whom were histologically confirmed as complete hydatidiform mole, while 50.5% had partial hydatidiform mole. 81.3% of patients had pre–evacuation sonography compatible with hydatidiform mole. The sensitivity and positive predictive value of ultrasound in detecting the histologically-proved hydatidiform moles were 90% and 100%, respectively.Conclusion: In this study, ultrasound had high accuracy in diagnosis of molar pregnancies. Therefore, sonography is highly recommended in all patients with vaginal bleeding in their first trimester.

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

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Issue Info: 
  • Year: 

    1384
  • Volume: 

    8
  • Issue: 

    1 (پی در پی 29)
  • Pages: 

    53-58
Measures: 
  • Citations: 

    0
  • Views: 

    7058
  • Downloads: 

    0
Abstract: 

سابقه و هدف: هدف از این مطالعه مقایسه نمونه های بدست آمده و دقت تشخیصی با استفاده از نمونه گیر آندومتر پایپل با دیلاتاسیون و کورتاژ متعارف (D&C) و یا نمونه های هیسترکتومی شده می باشد.مواد و روشها: این مطالعه مقطعی بر روی 50 بیمار که با شکایت خونریزی رحمی غیر نرمال (AUB) یا نازایی جهت dating آندومتر به بخش زنان بیمارستان امام رضا ارجاع داده شده بودند انجام گرفت. سی و هشت بیمار تحت نمونه گیری آندومتر با پایپل و D&C متعارف در یک جلسه قرار گرفتند در حالی که 12 مورد هیسترکتومی شدند. نمونه گیری توسط یک فرد انجام شد و نمونه ها توسط یک پاتولوژیست بررسی شد و سپس کفایت نمونه و تشخیص هیستولوژیک بررسی گردید.یافته ها: در 47 مورد از 50 مورد پایپل، نمونه کافی بدست آمد (94%) و تشخیص هیستولوژیک آن در 85% از موارد مشابه با نمونه حاصل از دیلاتاسیون و کورتاژ بود (40 از 47) حساسیت برای dating آندومتر 100% و برای پولیپ آندومتر 40% بود. در میان 7 مورد با تشخیص ناهماهنگ، یک مورد بدخیمی کارسینوم سلول سنگفرشی سرویکس با گسترش به ایسم و سگمان تحتانی بود. در این مورد تشخیص هیستولوژیک با پایپل، آندومتریوم غیر فعال احاطه شده با تکه های لخته بود.نتیجه گیری: دقت تشخیصی نمونه گیر آندومتر پایپل جهت dating آندومتر بسیار بالا است، اما در رویکرد به AUB، جایگزینی D&C متعارف با پایپل باید با احتیاط صورت گیرد و ترجیحا با سایر روشهای تشخیصی تکمیل شود.

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

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Issue Info: 
  • Year: 

    1357
  • Volume: 

    4
  • Issue: 

    54
  • Pages: 

    0-0
Measures: 
  • Citations: 

    1
  • Views: 

    162
  • Downloads: 

    0
Keywords: 
Abstract: 

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

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