NUMERICAL STUDY OF TURBULENCE DYNAMICS IN PLUNGING & SURGING BREAKING WAVES

KHAYYER ABBAS,YEGANEH-BAKHTIARY ABBAS,GHAHERI ABBAS,GOTOH HITOSHI,SAKAI TETSUO 한국수자원학회 2005 한국수자원학회 학술대회 Vol.2005 No.1

ON APPROXIMATE MIXED n-JORDAN HOMOMORPHISMS ON BANACH ALGEBRAS

( Abbas Zivari-kazempour ),( Mohammad Valaei ) 호남수학회 2020 호남수학학술지 Vol.42 No.4

In this paper, the Hyers-Ulam-Rassias stability of mixed n-Jordan homomorphisms on Banach algebras and the superstabil-ity of mixed n-Jordan *-homomorphism between C*-algebras are investigated.

FRS-OCC: Face Recognition System for Surveillance Based on Occlusion Invariant Technique

Abbas, Qaisar International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.8

Automated face recognition in a runtime environment is gaining more and more important in the fields of surveillance and urban security. This is a difficult task keeping in mind the constantly volatile image landscape with varying features and attributes. For a system to be beneficial in industrial settings, it is pertinent that its efficiency isn't compromised when running on roads, intersections, and busy streets. However, recognition in such uncontrolled circumstances is a major problem in real-life applications. In this paper, the main problem of face recognition in which full face is not visible (Occlusion). This is a common occurrence as any person can change his features by wearing a scarf, sunglass or by merely growing a mustache or beard. Such types of discrepancies in facial appearance are frequently stumbled upon in an uncontrolled circumstance and possibly will be a reason to the security systems which are based upon face recognition. These types of variations are very common in a real-life environment. It has been analyzed that it has been studied less in literature but now researchers have a major focus on this type of variation. Existing state-of-the-art techniques suffer from several limitations. Most significant amongst them are low level of usability and poor response time in case of any calamity. In this paper, an improved face recognition system is developed to solve the problem of occlusion known as FRS-OCC. To build the FRS-OCC system, the color and texture features are used and then an incremental learning algorithm (Learn++) to select more informative features. Afterward, the trained stack-based autoencoder (SAE) deep learning algorithm is used to recognize a human face. Overall, the FRS-OCC system is used to introduce such algorithms which enhance the response time to guarantee a benchmark quality of service in any situation. To test and evaluate the performance of the proposed FRS-OCC system, the AR face dataset is utilized. On average, the FRS-OCC system is outperformed and achieved SE of 98.82%, SP of 98.49%, AC of 98.76% and AUC of 0.9995 compared to other state-of-the-art methods. The obtained results indicate that the FRS-OCC system can be used in any surveillance application.

Microstructural Characterization of Gas Atomized Copper-Iron Alloys with Composition and Powder Size

Abbas, Sardar Farhat,Kim, Taek-Soo The Korean Powder Metallurgy Institute 2018 한국분말재료학회지 (KPMI) Vol.25 No.1

Cu-Fe alloys (CFAs) are much anticipated for use in electrical contacts, magnetic recorders, and sensors. The low cost of Fe has inspired the investigation of these alloys as possible replacements for high-cost Cu-Nb and Cu-Ag alloys. Here, alloys of Cu and Fe having compositions of $Cu_{100-x}Fe_x$ (x = 10, 30, and 50 wt.%) are prepared by gas atomization and characterized microstructurally and structurally based on composition and powder size with scanning electron microscopy (SEM) and X-ray diffraction (XRD). Grain sizes and Fe-rich particle sizes are measured and relationships among composition, powder size, and grain size are established. Same-sized powders of different compositions yield different microstructures, as do differently sized powders of equal composition. No atomic-level alloying is observed in the CFAs under the experimental conditions.

Certain New Families for Bi-univalent Functions Defined by a Known Operator

Abbas Kareem Wanas,최준상 영남수학회 2021 East Asian mathematical journal Vol.37 No.3

In this paper, we aim to introduce two new families of analytic and bi-univalent functionsassociated with the Attiya's operator, which is defined by the Hadamard product ofa generalized Mittag-Leffler function and analytic functions on the open unit disk. Then we estimate the second and third coefficients of the Taylor-Maclaurin series expansions of functions belonging to these families. Also, we investigate Fekete-Szeg\"{o} problem for these families. Some relevant connections of certain special cases of the main results with those in several earlier works are also pointed out. Two naturally-arisen problems are given for further investigation.

Modeling and Stimulating Node Cooperation in Wireless Ad Hoc Networks

Abbas Arghavani,Abolfazl Sargazi,Mahdi Arghavani,Mahmood Ahmadi 한국전자통신연구원 2015 ETRI Journal Vol.37 No.1

In wireless networks, cooperation is necessary for many protocols, such as routing, clock synchronization, and security. It is known that cooperator nodes suffer greatly from problems such as increasing energy consumption. Therefore, rational nodes have no incentive to cooperatively forward traffic for others. A rational node is different from a malicious node. It is a node that makes the best decision in each state (cooperate or non-cooperate). In this paper, game theory is used to analyze the cooperation between nodes. An evolutionary game has been investigated using two nodes, and their strategies have been compared to find the best one. Subsequently, two approaches, one based on a genetic algorithm (GA) and the other on learning automata (LA), are presented to incite nodes for cooperating in a noisy environment. As you will see later, the GA strategy is able to disable the effect of noise by using a big enough chromosome; however, it cannot persuade nodes to cooperate in a noise-free environment. Unlike the GA strategy, the LA strategy shows good results in a noise-free environment because it has good agreement in cooperation-based strategies in both types of environment (noise-free and noisy).

The Content and Necessity of the New International Order in the New International Environment

Abbas Maleki 한국중동학회 1991 韓國 中東 學會 論叢 Vol.12 No.1

Flow Table Design in Software Defined Networking based on PSO algorithm for enhanced packet loss and delay

Abbas Tataei,Farhad Faghani 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1

In the Software Design Network (SDN), Control Plane and Data Plane are separated from each other [1], [2], so we can improve many of network parameters by using this advantage in control plane utilizing algorithms and applying the control policies. With improving the quality of these parameters, we can enhance the Quality of Service in a network. In this study, the aim is to carry out orders which are designed in Application Layer by programmer and provide for control layer and apply to switches by it. We can minimize the rate of Packet Loss with designing multi flow table and use Particle Swarm Optimization algorithm to find best network graph and consider the omission of the Loop in the network which contribute to reduce delay in the received packets and finally, raise Throughput and the Reliability and increase QOS, MININET Emulator and Pox controller were simulated and the results were compared with the previous networks.

Antimicrobial and cytotoxic activity of Ferula gummosa plant essential oil compared to NaOCl and CHX: a preliminary in vitro study

Abbas Abbaszadegan,Ahmad Gholami,Hosein Mirhadi,Mina Saliminasab,Aboozar Kazemi,Mahmood Reza Moein 대한치과보존학회 2015 Restorative Dentistry & Endodontics Vol.40 No.1

Objectives: The usage of medicinal plants as natural antimicrobial agents has grown in many fields including dental medicine. The aim of this in vitro study was threefold: (i) to determine the chemical compositions of the Ferula gummosa essential oil (FGEO), (ii) to compare the antimicrobial efficacy of the oil with sodium hypochlorite (NaOCl) and chlorhexidine (CHX), (iii) to assess the toxic behavior of FGEO in different concentrations compared to 5% NaOCl and 0.2% CHX. Materials and Methods: Gas chromatography/mass spectrometry (GC/MS) was used to determine the chemical compositions of the oil. The disk diffusion method and a broth micro-dilution susceptibility assay were exploited to assess the antimicrobial efficacy against Enterococcus faecalis, Staphylococcus aureus, Streptococcus mitis, and Candida albicans. The cytocompatibility of the FGEO was assessed on L929 fibroblasts, and compared to that of NaOCl and CHX. Results: Twenty-seven constituents were recognized in FGEO. The major component of the oil was β-pinene (51.83%). All three irrigants significantly inhibited the growth of all examined microorganisms compared to the negative control group. FGEO at 50 μg/mL was effective in lower concentration against Enterococcus faecalis than 5% NaOCl and 0.2% CHX, and was also more potent than 0.2% CHX against Candida albicans and Staphylococcus aureus. FGEO was a cytocompatible solution, and had significantly lower toxicity compared to 5% NaOCl and 0.2% CHX. Conclusions: FGEO showed a promising biological potency as a root canal disinfectant. More investigations are required on the effectiveness of this oil on intracanal bacterial biofilms.

Neurologic Complications in Percutaneous Nephrolithotomy

Abbas Basiri,Mohammad Hossein Soltani,Mohammadreza Kamranmanesh,Ali Tabibi,Seyed Amir Mohsen Ziaee,Akbar Nouralizadeh,Farzaneh Sharifiaghdas,Mahtab Poorzamani,Babak Gharaei,Ardalan Ozhand,Alireza Lash 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.3

Purpose: Percutaneous nephrolithotomy (PCNL) has been the preferred procedure for the removal of large renal stones in Iran since 1990. Recently, we encountered a series of devastating neurologic complications during PCNL, including paraplegia and hemiplegia. There are several reports of neurologic complications following PCNL owing to paradoxical air emboli, but there are no reports of paraplegia following PCNL. Materials and Methods: We retrospectively reviewed the medical records of patients who had undergone PCNL in 13 different endourologic centers and retrieved data related to neurologic complications after PCNL, including coma, paraplegia, hemiplegia,and quadriplegia. Results: The total number of PCNL procedures in these 13 centers was 30,666. Among these procedures, 11 cases were complicated by neurologic events, and four of these cases experienced paraplegia. All events happened with the patient in the prone position with the use of general anesthesia and in the presence of air injection. There were no reports of neurologic complications in PCNL procedures performed with the patient under general anesthesia and in the prone position and with contrast injection. Conclusions: It can be assumed that using room air to opacify the collecting system played a major role in the occurrence of these complications. Likewise, the prone position and general anesthesia may predispose to these events in the presence of air injection.