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- 저자 : Engin, Raziye (검색결과 2,519 건)
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Accessory muscle in the forearm
Engin Ç,ıft Ç,ıoğ,lu,Cem Kopuz,Ufuk Ç,orumlu,Mehmet T. Demır 대한해부학회 2011 Anatomy & Cell Biology Vol.44 No.2
Muscular variations of the flexor compartment of forearm are usual and can result in multiple clinical conditions limiting the functions of forearm and hand. The variations of the muscles, especially accessory muscles may simulate soft tissue tumors and can result in nerve compressions. During a routine dissection of the anterior region of the forearm and hand, an unusual muscle was observed on the left side of a 65-year-old male cadaver. The anomalous muscle belly arose from the medial epicondyle approxiamately 1 cm posterolateral to origin of normal flexor carpi ulnaris muscle (FCU), and from proximal part of the flexor digitorum superficialis muscle. It inserted to the triquetral, hamate bones and flexor retinaculum. Passive traction on the tendon of accessory muscle resulted in flexion of radiocarpal junction. The FCU which had one head, inserted to the pisiform bone hook of hamate and palmar aponeurosis. Its contiguous muscles displayed normal morphology. Knowledge of the existence of muscle anomalies as well as the location of compression is useful in determining the pathology and appropriate treatment for compressive neuropathies. In this study, a rare accessory muscle has been described.
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( Gulcan Guntas ),( Burhan Engin1 ),( Ozlem Balcı Ekmekci ),( Zekayi Kutlubay ),( Hakan Ekmekci ),( Abdullah Songur ),( Tugba Kevser Ustunbas Uzuncakmak ),( Hayriye Ertem Vehid ),( Server Serdaroglu ) 대한피부과학회 2015 Annals of Dermatology Vol.27 No.3
Background: Vitiligo is a chronic, common disease of unknown etiology, and oxidative stress is suggested to have a role in its etiopathogenesis. Objective: Advanced oxidation protein products (AOPPs), prooxidant-antioxidant balance (PAB), and ferric-reducing antioxidant power (FRAP) were evaluated regarding their role in the pathogenesis of vitiligo as well as their relationship with clinical presentation and disease severity, and these parameters were compared with those of healthy controls. Methods: The study included 53 patients with vitiligo and 20 healthy volunteers as the control group. AOPP level, PAB, and FRAP were determined by colorimetric methods. Results: PAB and FRAP level were significantly higher in patients with vitiligo than in healthy controls (p<0.001). The AOPP levels in vitiligo patients were not statistically significantly higher than those in healthy controls. The Vitiligo Area Scoring Index positively correlated with disease duration (rs: 0.531, p<0.001). Conclusion: To the best of our knowledge, this is the first report of AOPP and PAB status in vitiligo. PAB may be used as an indicator for oxidative stress in the etiopathogenesis of vitiligo. Our results show that these parameters may play a major role in the melanocyte damage observed in vitiligo. Further studies are required to confirm the mechanisms underlying this effect. (Ann Dermatol 27(2) 178∼183, 2015)
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Abrasion of Model Rubber Compounds
Han,S. C.,Kim,Y.S. 여수대학교 1997 論文集 Vol.11 No.2
변형된 칼날 형태 마모 시험기와 DIN 마모 시험기를 사용하여 여러 가지 대표적 고무 컴파운드에 대한 마모 특성을 고찰하였다. 칼날 형태 마모 시험기의 경우 시편부피에 대한 마모된 표면적의 비율은 측정에 민감하면서 상대적으로 컸다. 마모속도는 마찰력(W)의 증가에 따라 아래와 같은 식과 같이 지수 함수적으로 증가하였고, a는 고무컴파운드의 종류에 따라 2~3.5 범위의 값을 보였다. h=AWa 이것은 마모가 미시적 크랙성장 과정을 보이기 때문이라고 생각된다. 그러나 대변혁인열 에너지를 갖는 임계 W값 이상에서 마모속도는 급격하게 증가하였다. 같은 시료를 DIN 마모시험기의 경우는 칼날 마모시험기의 걸과에 비해서 고무에 따른 마모속도의 차이가 훨씬 적었으며, α가 1~2로서 적용된 하중에 따른 민감도가 낮았다. 따라서 이들 마모 시험기 사이의 마모 메카니즘은 차이가 있다는 것을 알았다.
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Estimation of ultimate torque capacity of the SFRC beams using ANN
Engin, Serkan,Ozturk, Onur,Okay, Fuad Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.5
In this study, in order to propose an efficient model to predict the torque capacity of steel fiber reinforced concrete (SFRC) beams, the existing experimental data related to torsional response of beams is reviewed. It is observed that existing data neglects the effects of some parameters on the variation of torque capacity. Thus, an experimental research was also conducted to obtain the effects of neglected parameters. In the experimental study, a total of seventeen SFRC beams are tested against torsion. The parameters considered in the experiments are concrete compressive strength, steel fiber aspect ratio, volumetric ratio of steel fibers and longitudinal reinforcement ratio. The effect of each parameter is discussed in terms of torque versus unit angle of twist graphs. The data obtained from this experimental research is also combined with the data got from previous studies and employed in artificial neural network (ANN) analysis to estimate the ultimate torque capacity of SFRC beams. In addition to parameters considered in the experiments, aspect ratio of beam cross-section, yield strengths of both transverse and longitudinal reinforcements, and transverse reinforcement ratio are also defined as parameters in ANN analysis due to their significant effects observed in previous studies. Assessment of the accuracy of ANN analysis in estimating the ultimate torque capacity of SFRC beams is performed by comparing the analytical and experimental results. Comparisons are conducted in terms of root mean square error (RMSE), mean absolute error (MAE) and coefficient of efficiency ($E_f$). The results of this study revealed that addition of steel fibers increases the ultimate torque capacity of reinforced concrete beams. It is also found that ANN is a powerful method and a feasible tool to estimate ultimate torque capacity of both normal and high strength concrete beams within the range of input parameters considered.
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SiC Substrate Effects on Electron Transport in the Epitaxial Graphene Layer
Engin Arslan,Semih Çakmakyapan,Özgür Kazar,Serkan Bütün,Sefer Bora Li esivdin,Neval A. Cinel,Gülay Ertas,Sükrü Ardal,Engin T ras,Jawad-ul-Hassan,E. Janzén,Ekmel Özbay 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
Hall effect measurements on epitaxial graphene (EG) on SiC substrate have been carried out as a function of temperature. The mobility and concentration of electrons within the two-dimensional electron gas (2DEG) at the EG layers and within the underlying SiC substrate are readily separated and characterized by the simple parallel conduction extraction method (SPCEM). Two electron carriers are identified in the EG/SiC sample: one highmobility carrier (3493 cm2/Vs at 300 K) and one low-mobility carrier (1115 cm2/Vs at 300 K). The high mobility carrier can be assigned to the graphene layers. The second carrier has been assigned to the SiC substrate.
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