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Extraction of road features from UAV images using a novel level set segmentation approach
Abolfazl Abdollahi,Biswajeet Pradhan,Nagesh Shukla 서울시립대학교 도시과학연구원 2019 도시과학국제저널 Vol.23 No.3
A novel hybrid technique for road extraction from UAV imagery is presented in this paper. The suggested analysis begins with image segmentation via Trainable Weka Segmentation. This step uses an immense range of image features, such as detectors for edge detection, filters for texture, filters for noise depletion and a membrane finder. Then, a level set method is performed on the segmented images to extract road features. Next, morphological operators are applied on the images for improving extraction precision. Eventually, the road extraction precision is calculated on the basis of manually digitized road layers. Obtained results indicated that the average proportions of completeness, correctness and quality were 93.52%, 85.79% and 81.01%, respectively. Therefore, experimental results validated the superior performance of the proposed hybrid approach in road extraction from UAV images
Fatemeh Rafiemanzelat,Abolfazl Fathollahi Zonuz,Elahe Abdollahi 한국고분자학회 2012 Macromolecular Research Vol.20 No.9
In this study novel multi block polyurethane (PU) copolymers containing cyclodipeptide were synthesized under microwave irradiation using a quaternary ammonium salt (QAS) as reaction media. For this, L-leucine cyclodipeptide (LC) was prepared and then a new class of poly(ether-urethane-urea)s (PEUUs) was synthesized in tetrabutylammonium bromide (TBAB) via two-step polymerization method. In the first step, 4,4'-methylene-bis-(4-phenylisocyanate) (MDI) was reacted with LC to produce isocyanate-terminated oligo(imide-urea) as hard segment. The reaction of the aforementioned pre-polymer with poly(ethylene glycols) (PEG) with different molecular weights (PEG400, 600, 1000, and 2000) was the second step to furnish a series of new PEUUs. These PEUUs are thermally stable, soluble in amide-type solvents, hydrolysable, and biodegradable. The resulting PEUUs have inherent viscosities in the range of 0.37-0.67 dL/g. The effects of polymerization method and soft segment length on some of the polymers’ properties and their structural characteristics were compared. The protocol presented here has the merits of environmentally benign, simple operation, convenient work-up, short reaction time and good yields without using volatile organic solvents or catalysts. Ammonium type reaction medium was air and water stable, and relatively cheap, which makes it suitable for applications. The results demonstrate that it can be easily separated and reused without losing activity which makes the method cost effective and eco-benign.
Are So-Called Cancer-Testis Genes Expressed Only in Testis?
Ghafouri-Fard, Soudeh,Rezazadeh, Fatemeh,Zare-Abdollahi, Davood,Omrani, Mir Davood,Movafagh, Abolfazl Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.18
Cancer-testis (CT) antigens are a group of tumor-associated antigens with restricted expression in normal tissues except for testis and expression in a wide variety of tumor tissues. This pattern of expression makes them suitable targets for immunotherapy as well as potential biomarkers for early detection of cancer. However, some genes attributed to this family are now known to be expressed in other normal tissues which put their potential applications in immunotherapy and cancer detection under question. Here we analyzed expression of two previously known CT antigens, RHOXF2 and PIWIL2, in AML patients versus normal donors and found no significant difference in the expression of these genes between the two groups. As these two genes showed expression in normal leukocytes, their expression pattern seems to be wider than to be attributed to the CT gene family. Future research should focus on the expression profiles of so called CT antigens to find those with more testis specific expression.
Lack of Altered BECN1 Gene Expression in Iranian Patients with Acute Myeloid Leukemia
Keyvan, Ladan,Bidoki, Seyed Kazem,Abdollahi, Davood Zare,Mansouri, Neda,Hashemi, Mehrdad,Tabatabaei, SA Mortazavi,Fardmanesh, Hediyeh,Meimandi, Mansour,Ayatollahi, Seyed Majid,Movafagh, Abolfazl Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12
Acute myeloid leukemia (AML), one of the most prevalent leukemia types in adults, demonstrates great heterogeneity in molecular and clinical terms. Hence, there is a necessity to the mechanisms involved in AML generation in order to determine optimal treatment. This cross sectional study aimed to assess changes in BECN1 gene expression in with blood samples from 30 AML patients, compared with samples from 15 healthy persons. RNA was extracted and cDNA was synthesized and Real Time PCR applied to determine BECN1 gene expression. The results showed no significant differences in BECN1 gene expression between patients with AML and normal controls (P > 0.05). It appears that expression of BECN1 does not play a significant role in genesis of AML leukemia.
Seifi-Alan, Mahnaz,Shamsi, Roshanak,Ghafouri-Fard, Soudeh,Mirfakhraie, Reza,Zare-Abdollahi, Davood,Movafagh, Abolfazl,Modarressi, Mohammad Hossein,Kazemi, Golnesa,Geranpayeh, Lobat,Najafi-Ashtiani, Mi Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11
Breast cancer accounts for one third of new cancer cases among women. The need for biomarkers for early detection is the stimulus to researchers to evaluate altered expression of genes in tumours. Cancer-testis (CT) genes are a group with limited expression in normal tissues except testis but up-regulation in a wide variety of cancers. We here evaluated expression of two CT genes named FBXO39 and TDRD4 in 32 invasive ductal carcinoma samples, 10 fibroadenomas and 6 normal breast tissue samples, in addition to two breast cancer cell lines, MCF-7 and MDA-MB-231, by the means of quantitative real time RT-PCR. FBXO39 showed significant up-regulation in invasive ductal carcinoma samples in comparison with normal samples. It also was expressed in both cell lines and after RHOXF1 gene knock down it was down-regulated in MCF-7 but up-regulated in the MDA-MB-231 cell line. TDRD4 was not expressed in the MCF-7 cell line and any of the tissue samples except testis. However, it was expressed in MDA-MB-231 and was up-regulated after RHOXF1 gene knock down. Our results show that FBXO39 but not TDRD4 can be used for cancer detection and if proved to be immunogenic, might be a putative candidate for breast cancer immunotherapy.