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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Computing and Security
- نوع مقاله: Journal Article
- کلمات کلیدی: Social network,Betweenness Centrality,Team Formation,Graph Pruning,Skill Spreading
- چکیده:
- چکیده انگلیسی: Teamwork and cooperative working are increasingly needed due to the growing complexity of scientific problems and highly specialized research projects. Although many studies have been conducted on the subject of team formation in social networks, the challenge of forming a team of experts at optimum cost while maintaining maximum skill fulfillment persists. The main objective in team formation problem is to assemble a team of experts to satisfy all of the technical skill requirements of a given project while minimizing the communication and personnel cost. Electing a good leader for the team leads to better organizing and management of the entire team and also helps to lower the communication cost. Therefore, in this study three algorithms are proposed to identify a team of experts and a leader. These algorithms select the best leader and a team with the minimum cost by pruning the communication graph, identifying the effective nodes and choosing candidates for leadership according to various criteria. Moreover, a new combinational cost function is defined based on the linear combination of the objectives to minimize the personnel and communication costs. The results of experiments on a DBLP data set reveals that these algorithms are faster and more effective compared to other algorithms. The obtained results are due to the omission of excessive nodes according to the skills of experts and the project's requirements, along with choosing the leader based on appropriate criteria.
- انتشار مقاله: 28-12-1396
- نویسندگان: Somayeh Tavakoli,Afsaneh Fatemi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational and Applied Research in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Laminar flow,Mixing index,Chaotic mixer,Average rotational speed
- چکیده:
- چکیده انگلیسی: Laminar mixing of glycerin in a chaotic mixer is carried by means of the blob deformation method. The mixer was a cylindrical vessel with two rotational blades which move along two different circular paths with a stepwise motion protocol. The flow visualization was performed by marking of the free surface of the flow with a tracer. The effects of controlling parameters such as rotational speed of blades, blades length, and rotational speed amplitude on mixing efficiency and time were analyzed by measuring of the area covered by the tracer. The results revealed that increasing rotational speed intensifies stretching and folding phenomenon, and consequently better mixing can be obtained. Also, the better condition in flow kinematic was provided to blend as stepwise motion protocol with wider amplitude adopted. A reduction in mixing time could be observed as the blades with longer length were used. In addition, it was also found that the promotion of mixing by rotational speed is more effective than that of two other parameters. The quantitative data and qualitative observations proved the potential of proposed chaotic mixer in wide range of industrial processes including chemical reaction and food processing in which laminar mixing is required.
- انتشار مقاله: 18-04-1395
- نویسندگان: Payam Rahim Masharei,Seyed Mostafa Hosseinalipour,Mohammad Javad Moslemani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Communication Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: microwave imaging,MUSIC algorithm,Focusing method,Extended target
- چکیده:
- چکیده انگلیسی: This paper presents a data focusing method (DFM) to image extended targets using the multiple signal classification (MUSIC) algorithm. The restriction on the number of transmitter-receiver antennas in a microwave imaging system deteriorates profiling an extended target that comprises many point scatterers. Under such situation, the subspace-based linear inverse scattering methods, like the MUSIC algorithm, fail to image the extended targets. In proposed method, the DFM divides imaging region into several sections and maps the scattered data to each section by applying a linear transformation. Being weakened clutters from other sections, the resultant focused data contains, mostly, the responses of scatterers inside the desired section. In this way, the number of scatterers is reduced comparing to the number of transmitter-receiver antennas and the requirement for the MUSIC is satisfied. Using experimental data, we show that the DFM in conjunction with the MUSIC is successful in microwave imaging of extended targets.
- انتشار مقاله: 11-06-1396
- نویسندگان: Tayebeh Gholipur,Mansor Nakhkash
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Bioengineering Research
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: Charges in liposome composition plays a critical role, so it has significant outcome on the manner of liposome in vitro and in vivo. Neutral and cationic liposomes (LPFS and CLPFS) were prepared and characteristics of LPFS and CLPFS were studied after PHMB encapsulation. According to results, CLPFS exhibited higher cytotoxicity activity, while kept similar size distribution, encapsulation efficiency, lower prolonged retention release profile in comparison to LPFS. CLFPS represented more stable release due to its mutual repulsive force. MTT assay of the produced formulation was examined versus normal primary human skin fibroblast cells and free PHMB presented stronger cytotoxic activity when compared to both cationic and neutral liposomes. It was concluded that PHMB are more toxic to the body but encapsulation liposome specially in neutral liposome can reduce the toxic effect of them.
- انتشار مقاله: 03-07-1398
- نویسندگان: Elnaz Ahani,Tayebeh Toliyat,Mahnaz Mahmoudi Rad
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Bioengineering Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Real-Time Polymerase Chain Reaction,Rotavirus,RNAs
- چکیده:
- چکیده انگلیسی: Introduction: We previously established virus like particles (VLPs) and core like particles (CLPs) of rotavirus (RV) with VP2, VP6, and VP7 proteins using stable high-five cell line. Given the fact that these proteins have the ability to assemble together, we further aimed to examine in detail the possibility of viral transcripts to randomly package in VLPs and CLPs.
Objective: For this purpose, the presence of VP2, VP6 and VP7 transcripts were evaluated in VLPs and CLPs.
Materials and Methods: To investigate the presence of VP2 transcript in CLPs of RV and VP2, VP6 and VP7 transcripts in RV VLPs, RNAs were extracted from VLPs and CLPs purified from stable high-five cells and evaluated by Real-time Reverse Transcriptase (RT)-Polymerase Chain Reaction (PCR).
Results: The result indicated that the RV VLPs and CLPs were empty (VP2, VP6 and VP7 transcripts-free), showing that VLPs and CLPs cannot encapsidate RNAs in absence of other viral proteins.
Conclusion: Our results indicate the necessity of further viral proteins for sorting and packaging, which highlight the role of selective mechanism for RV packaging.- انتشار مقاله: 30-10-1397
- نویسندگان: Zabihollah Shoja,Somayeh Jalilvand
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Bioengineering Research
- نوع مقاله: Journal Article
- کلمات کلیدی: PCR,immunohistochemistry,Human herpesvirus 8,Kaposi’s sarcoma
- چکیده:
- چکیده انگلیسی: Introduction: Kaposi's sarcoma (KS) is a neoplasm involving blood and lymphatic vessels that has been characterized in four different clinical and epidemiological forms (classic, endemic, iatrogenic and epidemic). KS incidence is reported low in the general population of Iran while it is reported high among Iranian renal transplant recipients.
Objective: There are only some studies regarding the epidemiological and clinical features of KS in Iranian renal transplant recipients, but no reports are available on classic KS.
Materials and Methods: Present study intended to assess retrospectively the demographic and clinical features of 44 KS patients referred to the Razi Hospital in Tehran from 2000 to 2009. It also intended to detect human herpesvirus 8 to confirm the KS histological diagnosis.
Results: In these series of patients, 77.3% were male and 22.7% were female. There was a male predominance with a ratio of 3.4/1. Classic, epidemic and iatrogenic KS are found in 40 (90.9%), 2 (4.55%) and 2 (4.55%) of patients, respectively. The mean age was 62.87 among 40 patients with classic KS. In most cases (93.2%), KS was limited to the skin, without mucosal, lymph node or visceral manifestations. KS lesions mainly localized to the skin of extremities, particularly lower extremities. HHV-8 antigen and genome was detected in all samples.
Conclusion: This study showed that the picture of KS is similar to previous reports in our region. Also, our results confirmed the pathological diagnosis of KS cases in our study group.- انتشار مقاله: 12-10-1397
- نویسندگان: Somayeh Jalilvand,Zahra Safaie-Naraghi,Zabihollah Shoja
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dental Materials and Techniques
- نوع مقاله: Journal Article
- کلمات کلیدی: temporomandibular joint,Cone Beam CT,Bone Changes
- چکیده:
- چکیده انگلیسی: Introduction: Temporomandibular joint (TMJ) disorders are among the most prevalent abnormalities of the jaw, which affect the masticatory system, including the muscles, TMJ, and tendons. Clinical examination alone cannot determine the cause of temporomandibular disorder (TMD). In most cases, the cause of TMD and a proper treatment plan are determined based on imaging modalities. The present study aimed to investigate
the bone changes in the patients with TMD symptoms using cone beam computed tomography (CBCT).
Methods: This retrospective, cross-sectional study was conducted through recording data on the pain caused by TMJ (upon touching, using the TMJ, and maximum mouth opening), clicking, and crepitus using a checklist of clinical symptoms. CBCT images were examined for the associated bone changes, including sclerosis, flattening, erosion, and osteophyte. Data analysis was performed in SPSS version 21 using Chi-square and logistic regression analysis. Results: In total, 160 joint images were examined, including 132 cases of flattening (82.5%), 45 cases of sclerosis (28.12%), 41 cases of osteophytes (25.62%), and 66 cases of erosion (41.25%). A significant association was observed between pain and flattening, and sclerosis and osteophytes. Moreover, a significant correlation was observed between flattening and clicking (P<0.05). Conclusion: According to the results, flattening was the most common bone change in the patients with TMD. In addition, sclerosis had the most significant association with pain, while sclerosis, osteophytes, and erosion were significantly correlated with joint crepitation.
- انتشار مقاله: 08-05-1397
- نویسندگان: Fatemeh Hafez Maleki,Abbas Shokri,Seyyed Hossein Hosseini Zarch,Amirhossein Bahraniy,Alireza Ebrahimpour,Seyede Mona Alimohamadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dental Materials and Techniques
- نوع مقاله: Journal Article
- کلمات کلیدی: salivary gland tumor,pleomorphic adenoma,Mixed tumor,salivary gland cancer
- چکیده:
- چکیده انگلیسی: Introduction: Pleomorphic adenoma of the upper lip is a rare entity and its diagnosis requires a high index of suspicion. The aim of this study was to review the reported cases of pleomorphic adenoma (PA) of the upper lip. Methods: This study was performed on the basis of the clinical features of 10 well-documented reported cases of the upper lip pleomorphic adenomas from 1990 to 2012 which have been indexed in the PubMed. The search strategy based on MeSH keywords included "salivary gland tumor", "salivary gland cancer", "pleomorphic adenoma", and "mixed tumor". In the clinical records the following data have been considered: Age, sex, clinical view, complaint time, site, size, texture, pathological view, treatment, recurrence rate, symptom and follow-up period. Results: Of the 11 reported cases of PA, 7 (63.7%) were female and 4 (36.3%) were male, with age ranging from 12 to 65 years. 50% of the patients were between 35 and 55 years of age. Only 3 (27.2%) of cases were younger than 20. The main clinical presentation of lesion in all cases was a submucosal nodule. There was a large interval between the first symptoms and diagnosis. The size of the lesions were between 1 and 3 cm. Involvement of the right half of the upper lip was more common than the left side. 63.6% of the lesions showed a firm consistency and bone formation was seen in one (9.09%) case. The follow-up period ranged from 5 to 48 months. There was no evidence of recurrence in any of the reported cases. Conclusion: Although rare, pleomorphic adenoma should be considered as a differential diagnosis for the swellings in the upper lip. PA has a potential for malignant transformation
- انتشار مقاله: 09-07-1392
- نویسندگان: Hamed Mortazavi,Somayeh Alirezaei,Saranaz Azari-Marhabi,Maryam Baharvand,Majid Eshghpour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dental Materials and Techniques
- نوع مقاله: Journal Article
- کلمات کلیدی: salivary gland tumor,pleomorphic adenoma,Mixed tumor,salivary gland cancer
- چکیده:
- چکیده انگلیسی: Introduction: Pleomorphic adenoma of the upper lip is a rare entity and its diagnosis requires a high index of suspicion. The aim of this study was to review the reported cases of pleomorphic adenoma (PA) of the upper lip. Methods: This study was performed on the basis of the clinical features of 10 well-documented reported cases of the upper lip pleomorphic adenomas from 1990 to 2012 which have been indexed in the PubMed. The search strategy based on MeSH keywords included "salivary gland tumor", "salivary gland cancer", "pleomorphic adenoma", and "mixed tumor". In the clinical records the following data have been considered: Age, sex, clinical view, complaint time, site, size, texture, pathological view, treatment, recurrence rate, symptom and follow-up period. Results: Of the 11 reported cases of PA, 7 (63.7%) were female and 4 (36.3%) were male, with age ranging from 12 to 65 years. 50% of the patients were between 35 and 55 years of age. Only 3 (27.2%) of cases were younger than 20. The main clinical presentation of lesion in all cases was a submucosal nodule. There was a large interval between the first symptoms and diagnosis. The size of the lesions were between 1 and 3 cm. Involvement of the right half of the upper lip was more common than the left side. 63.6% of the lesions showed a firm consistency and bone formation was seen in one (9.09%) case. The follow-up period ranged from 5 to 48 months. There was no evidence of recurrence in any of the reported cases. Conclusion: Although rare, pleomorphic adenoma should be considered as a differential diagnosis for the swellings in the upper lip. PA has a potential for malignant transformation
- انتشار مقاله: 09-07-1392
- نویسندگان: Hamed Mortazavi,Somayeh Alirezaei,Saranaz Azari-Marhabi,Maryam Baharvand,Majid Eshghpour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dental Materials and Techniques
- نوع مقاله: Journal Article
- کلمات کلیدی: blood pressure,Heart rate,Epinephrine,Lidocaine,local anesthesia
- چکیده:
- چکیده انگلیسی: Introduction: Epinephrine-containing lidocaine is the most used anestheic drug in dentistry. The aim of this study was to investigate the hemodynamic changes following local infiltration of 2%lidocaine with 1:80,000 epinephrine in subjects undergoing orthognatic surgery under general anesthesia. Methods: Twenty five patients without any systemic disease participated. After general anesthesia, two cartridges of 2% lidocaine + 1:80,000 epinephrine were infiltrated around the surgery site. Systolic (SBP) and diastolic (DBP) blood pressure, mean arterial blood pressure (MAP), heart rate (HR), and blood sugar (BS) were measured in three stages: before the injection (M1), at the end of injection (M2), and 10 min after injection (M3). Results: No significant difference observed in SBP, DBP, and MAP at the end of injection and 10 min later. HR was increased significantly after injection and remained significantly higher than baseline after 10 min. BS increased slightly at the end of injection and continued to increase after 10 min. However, changes in BS were not significant. Conclusion: Using two cartridges of epinephrine-containing lidocaine have slight systemic changes in healthy subjects; as a result, this dosage could be used in patients with cardiovascular complications undergoing general anesthesia.
- انتشار مقاله: 21-07-1391
- نویسندگان: Baratollah Shaban,Elham Moradi,Amir Hossein Nejat,Somayeh Sabzali Zanjanhkhah,Touraj Vaezi
- مشاهده