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Jamshid Sangirov,Ikechi Augustine Ukaegbu,Tae-Woo Lee,Mu Hee Cho,박효훈 한국전자통신연구원 2012 ETRI Journal Vol.34 No.1
A video signal through a high-density optical link has been demonstrated to show the reliability of optical link for high- data-rate transmission. To reduce optical point-to-point links, an electrical link has been utilized for control and clock signaling. The latency and flicker with background noise occurred during the transferring of data across the optical link due to electrical-to-optical with optical-to-electrical conversions. The proposed synchronization technology combined with a flicker and denoising algorithm has given good results and can be applied in high-definition serial data interface (HD-SDI), ultra-HD-SDI, and HD multimedia interface transmission system applications.
Jamshid Esmaeili,Neyram Ahooghalandary 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.23 No.3
Precast reinforced concrete structure (PRCS) consists of prefabricated members assembled at worksites and has more connections limitations in comparison with the equivalent in-situ reinforced concrete structure (IRCS). As a result of these limitations, PRCSs have less ductility in comparison with IRCSs. Recent studies indicate that the most noticeable failure in PRCSs have occurred in their connection zone. The objective of this study is introducing a type of precast beam-to-column connection (PBC) which in spite of being simple is of the same efficiency and performance as in-situ beam-to-column connection (IBC). To achieve this, the performance of proposed new PBC at exterior joint of a four story PRCS was analyzed by pseudo dynamic analysis and compared with that of IBC in equivalent IRCS. Results indicated that the proposed connection has even better performance in terms of strength, energy dissipation and stiffness, than that of IBC.
Compressive quasistatic and dynamic behavior of SiC/ZrO2 aluminum-based nanocomposite
Jamshid Nemati,Meysam Toosian,Seyed Shahin Banisdar,Seyed Mahdi Ahmadpour 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
This research investigated the mechanical properties of aluminum-based nanocomposite. The spark plasma sintering method was adopted to fabricate the samples. The nanoparticles and the base metal powder were mechanically mixed in four volumetric ratios under an argon-gas-neutral atmosphere using a planetary ball milling machine. The dynamic and static compressive behaviors of the samples were studied under three different loading rates, and the microhardness of the specimens was measured. Results revealed significant improvements in microhardness, quasistatic, and the dynamic compressive strength, which can be attributed to several mechanisms, including the load transfer effect, Hall-Patch strengthening, Orowan strengthening, coefficient of thermal expansion, and elastic modulus mismatch effects. The most effective mixture was found to be 92 vol% of Al, 4 vol% of SiC, and 4 vol% of ZrO 2 . This combination of raw materials led to ultimate strengths of 204.517, 396.825, and 572.624 MPa at strain rates of 0.33, 13.33, and 2000 s -1 , respectively.
Jamshid Behin,Azade Ahmadi 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
The effect of mode of sparging gas on the mixing parameters of an internal loop airlift bioreactor was investigated. Two bioreactors of identical volume of 14×103 cm3 and the optimum riser to downcomer cross sectional area ratio of 0.6 were studied. In one bioreactor a gas sparger was located in the draft tube and in the annulus in another. Liquid mixing characteristics, i.e., mixing time and circulation time, were employed to describe the performance of the bioreactors. The tracer injection method was used to determine the mixing parameters. A mathematical modeling based on the tanks-in-series model was employed to characterize the hydrodynamics behavior of the bioreactors. Matlab 7.1 software was used to solve the model equations in the Laplace domain and determine the model parameter, the number of stages. A comparison between the simulation results and experimental data showed that the applied model can accurately describe the behavior of the bioreactors. The results showed that when the gas sparger was located in the draft tube, the liquid mixing time, circulation time, and the number of stage were less than while the gas sparger was located in annulus. This is due to more wall effects, more energy losses and pressure drop in the case of gas injection in the annulus.
Primary Thymic Mucinous Adenocarcinoma: A Case Report
Jamshid Abdul-Ghafar,정순희,용석중,권우철,박일환 대한병리학회 2012 Journal of Pathology and Translational Medicine Vol.46 No.4
Primary thymic mucinous adenocarcinoma is an extremely rare aggressive subtype of thymic carcinoma. With a review of literatures, only nine cases have been reported up to present. A 36-year-old woman was admitted for further evaluation and treatment of a mediastinal mass. The patient had no medical history of cancer. The clinicoradiological examination disclosed no tumor elsewhere. After the surgical excision of mediastinal mass, it was grossly a round semi-solid mass with mucin-filled cystic areas. Microscopically solid areas showed cords, small nests and dilated glands infiltrating the fibrotic parenchyma, while the cystic areas were lined by mucinous epithelium with tumor cells floating in extracellular-mucin pools. Some cystic walls underwent malignant transformation of the benign thymic epithelium. Immunohistochemically, the tumor cells were positive for cytokeratin (CK) 7, CK20, CD5, and CDX-2, and negative for thyroid transcription factor-1. In conclusion, the mucinous thymic adenocarcinoma should be recognized as a separate histopathological entity and considered in the differential diagnosis of mediastinal carcinomas.
Jamshid Behin,Tahereh Shojaeimehr 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3
Liquid phase RTD curves were investigated in classical fixed and fluidized bed regimes with high density particles. The effect of liquid velocity was studied on bed hydrodynamics. Using an impulse tracer injection technique in a column of 5 cm inner diameter and 1.2 m height, liquid RTD, mean residence time (MRT), axial dispersion coefficient (ADC) and vessel dispersion number (N_D) were determined. ADC increases with liquid superficial velocity. It varied from 4.63 to 20.7 cm^2/s for the particle Reynolds number of 43 to 279, respectively. The experimental results show that the hight density particles cause less ADC than the low density particles at an identical Reynolds number.