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H.264 Mapping Strategies for Robust Video Streaming over IEEE 802.11e WLAN
Umar Iqbal Choudhry,JongWon Kim 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
In this paper we propose several mapping schemes for streaming video generated by state?of?the?art H.264 codec over IEEE 802.11e enabled wireless LANs. The schemes take advantage of both 802.11e’s QoS mechanism and some novel features of the H.264 codec, so as to protect the most important information in terms of visual quality and reduce distortion under network congestion. The proposed methods are evaluated by means of the H.264 reference software codec, network simulation, and objective video quality measurements. Results show that the proposed methods achieve a robust and error resilient H.264 video streaming over wireless LANs than traditional best?effort streaming.
Morphology controlled facile synthesis of MnO2 adsorbents for rapid strontium removal
Umar Asim,Syed M. Husnain,Naseem Abbas,Faisal Shahzad,Abdul Rehman Khan,Tahir Ali 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
MnO2 nanostructures with three distinct architectures, namelyflower, balk and tube-like, have beensynthesized through a single step microwave assisted hydrothermal method at different reactiontemperatures (110 C, 140 C and 180 C). The characterization of as prepared MnO2 samples wereperformed by means of Fourier transform infrared spectroscopy, X-ray diffraction, scanning electronmicroscopy, and transmission electron microscopy. The N2 adsorption–desorption isotherms revealedthe higher specific surface area and porosity of theflower like MnO2 as compared to balk and tube-likeMnO2. The adsorption behavior of as prepared adsorbents was investigated towards Sr2+ radionuclide. Because of the hierarchal structure and the high surface area (62.64 m2/g), MnO2-110 depicted the bestSr2+ adsorption performance with maximum adsorption capacity of 52 mg/g at pH 6 as compared to otherMnO2 morphologies synthesized at 140 C and 180 C. The kinetic studies revealed that the adsorption ofSr2+ onto MnO2-110 followed the pseudo-first-order model whereas the adsorption equilibrium dataobeyed the Freundlich and Sips model. Moreover, the MnO2-110 adsorbent reached the steady statequickly ( 10 min) and is capable to bind Sr2+ in slightly acidic to alkaline solutions.
Umar, A.,Kim, S.H.,Suh, E.K.,Hahn, Y.B. North Holland ; Elsevier Science Ltd 2007 Chemical physics letters Vol.440 No.1
Highly crystalline aligned javelin-like ZnO nanorods have been synthesized, for the first time, by thermal evaporation method. The as-grown nanorods have been made by the assembling of two pieces of ZnO nanorods, i.e. hexagonal-shaped nanorods and inverted nanocones which are connected to each other in such a manner that the shaft of the nanocones is attached to the upper portion of the hexagonal nanorod and forms a javelin-like ZnO nanorod. Most importantly, the as-grown nanorods exhibit only a sharp and strong UV emission at 381nm, confirming an excellent optical property and showing excellent photoluminescent application potential.
The Clinical Implications of Poly Implant Prothèse Breast Implants: An Overview
Umar Wazir,Abdul Kasem,Kefah Mokbel 대한성형외과학회 2015 Archives of Plastic Surgery Vol.42 No.1
Mammary implants marketed by Poly Implant Prothèse (PIP) were found to contain industrialgrade silicone and this caused heightened anxiety and extensive publicity regarding theirsafety in humans. These implants were used in a large number of patients worldwide foraugmentation or breast reconstruction. We reviewed articles identified by searches of Medline,PubMed, Embase, and Google Scholar databases up to May 2014 using the terms: “PIP”, “PolyImplant Prothèse”, “breast implants” and “augmentation mammoplasty” “siloxanes” or“silicone”. In addition the websites of regulating bodies in Europe, USA, and Australia weresearched for reports related to PIP mammary implants. PIP mammary implants are more likelyto rupture than other implants and can cause adverse effects in the short to the medium termrelated to the symptoms of rupture such as pain, lumps in the breast and axilla and anxiety. Based on peer-reviewed published studies we have calculated an overall rupture rate of 14.5%(383/2,635) for PIP implants. However, there is no evidence that PIP implant rupture causeslong-term adverse health effects in humans so far. Silicone lymphadenopathy represents aforeign body reaction and should be treated conservatively. The long-term adverse effectsusually arise from inappropriate extensive surgery, such as axillary lymph node dissection orextensive resection of breast tissue due to silicone leakage.
Umar, Ahmad,Kim, S.H.,Kim, J.H.,Park, Y.K.,Hahn, Y.B. Elsevier 2007 Materials letters Vol.61 No.27
<P><B>Abstract</B></P><P>Well-crystallized with excellent optical properties, needle-shaped ZnO nanowires have been synthesized on silicon substrate in a high density via the thermal evaporation of metallic zinc powder without the use of catalysts or additives. Extensive structural analysis showed that the grown nanowires are highly crystalline with the wurtzite hexagonal phase, grown along the [0001] in the c-axis direction. The presence of an optical-phonon <I>E</I><SUB>2</SUB> mode in Raman spectrum at 437?cm<SUP>− 1</SUP> and sharp and strong UV emission at 379?nm with no green emission in the room-temperature photoluminescence (PL) spectrum confirms good crystallinity with the excellent optical properties for the deposited nanowires.</P>
Growth and optical properties of large-quantity single-crystalline ZnO rods by thermal evaporation
Umar, Ahmad,Suh, E K,Hahn, Yoon-Bong Institute of Physics [etc.] 2007 Journal of Physics. D, Applied Physics Vol.40 No.11
<P>Large-quantity synthesis of single-crystalline perfectly hexagonal-shaped ZnO rods has been achieved through the thermal evaporation of metallic zinc powder in the presence of oxygen without the use of metal catalyst or additives. Detailed structural analyses confirm that the structures formed exhibit a wurtzite hexagonal phase and are preferentially oriented along the <I>c</I>-axis direction. Low-temperature photoluminescence shows that the exciton emission bound-to-neutral donor (D<SUP>0</SUP>X) and free-exciton dominate the edge emission region while the donor–acceptor pair (DAP) and its replica dominate the lower energy regions. With increased temperature, D<SUP>0</SUP>X decreases abruptly and is then suppressed, but with further increase in temperature (>100 K) the photoluminescence spectra are dominated by the DAP.</P>
A Centralized e-pedigree system for Agriculture Food Distribution Network
Umar Farooq,Ganjar Alfian,M. Alex Syaekhoni,HyeJung Ahn,Jongtae Rhee 한국경영과학회 2014 한국경영과학회 학술대회논문집 Vol.2014 No.5
Food quality and safety has attained the considerable attention, because of the consumers increasing health awareness, improved economic standards and lifestyle of modern societies. Thus, it is important for distributors, retailers and consumers to purchase agriculture food products and track that they have come through the legal and safe distribution channels. In this paper we proposed a Centralized EPCIS and Sensor Data Repositories based e-pedigree system for agriculture food products to guarantee the quality, safety and reliability of agriculture food products for final consumers. This system not only assure the authenticity of the agriculture food products but also assure the food quality through environmental information such as temperature and humidity during storage, distribution and transportation for food quality.