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.

Aggregation Behavior of Oppositely Charged Gold Nanorods in Aqueous Solution

Umar, Aminah,Choi, Sung-Min American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.22

<P>The aggregation behavior of oppositely charged gold nanorods (GNRs) in aqueous solution has been investigated by zeta potential, UV–vis–NIR, DLS, and TEM measurements. The positively charged GNRs (p-GNRs) and negatively charged GNRs (n-GNRs) were prepared by layer-by-layer deposition of oppositely charged electrolytes on GNR surface. As p-GNRs are added into n-GNR solution (before reaching the isoelectric point), p-GNR/n-GNR aggregations of fairly constant size are formed with the minor component (p-GNRs) mostly at the center and the majority component (n-GNRs) at the outside. While the overall packing of the GNR aggregates is rather random, the local arrangements of GNRs show both side-by-side and end-to-end arrangements, resulting in elongated aggregates due to the anisotropic nature of GNRs. While no precipitation occurs before isoelectric point, the size of aggregates grows rapidly as the isotropic point is approached and rapid precipitation occurs at the isoelectric point, showing ionic-like behavior. Beyond the isoelectric point, partial dissolution of aggregates occurs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-22/jp3102095/production/images/medium/jp-2012-102095_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp3102095'>ACS Electronic Supporting Info</A></P>

HOW TO DEAL WITH RADIO ASTRONOMY INTERFERENCE

UMAR, ROSLAN,HAZMIN, SABRI NOR,ABIDIN, ZAMRI ZAINAL,IBRAHIM, ZAINOL ABIDIN The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2

Radio sources are very weak, as they can travel through large distances. Radio sources also have photons with low energies compared to others electromagnetic waves (EM). Microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and the most energetic electromagnetic wave is gamma-rays. Radio astronomy studies are restricted due to radio frequency interference (RFI) produced by people. If this disturbance is not minimized, it poses critical problems for astrophysical studies. The purpose of this paper is to profile RFI maps in Peninsular Malaysia with a minimum mapping technique for RFI interference. Decision-making processes using GIS (Geographical Information System) for the selection requires gathering information for a variety of parameters. These factors affecting the selection process are also taken into account. In this study, various factors or parameters are involved, such as the availability of telecommunications transmission (including radio and television), rainfall, water lines and human activity. This mapping step must be followed by RFI site testing in order to identify areas of low RFI. This study will benefit radio astronomy research, especially regarding the RFI profile.

A Centralized e-pedigree system for Agriculture Food Distribution Network

Umar Farooq,Ganjar Alfian,M. Alex Syaekhoni,HyeJung Ahn,Jongtae Rhee 대한산업공학회 2014 대한산업공학회 춘계학술대회논문집 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.

Description of Neolimothrips binervis (Kobus) (Thripidae: Thysanoptera: Chirothripin) from Pakistan, with a New Locality Record

UMAR, Muhammad,Waseem AKRAM,최종경,이종진 한국곤충학회 2004 Entomological Research Vol.34 No.1

Genus Neolimothrips with a single species N. binervis has been collected, identifiedand described for the first time from Azad Jammu and Kashmir, Pakistan. Redescription andillustration of the key characters of the species are provided. The genus and the only collectedspecies can easily be identified and separated on the basis of head protruding in front of eyes andantennal segments 3-4 with simple sense cones.

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.

ZnO Nanorods Based Hydrazine Sensors

Umar, Ahmad,Rahman, M. M.,Hahn, Yoon-Bong American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.8

<P>Electrochemical sensor for the detection of hydrazine has been fabricated at the surface of gold electrode modified with ZnO nanorods. The ZnO nanorods were grown by non-catalytic simple thermal evaporation process by using metallic zinc powder in the presence of oxygen at low-temperature. The detailed structural studies revealed that the as-grown ZnO nanorods are well-crystalline with the wurtzite hexagonal phase and grown along the [0001] direction in preference. A good and reproducible sensitivity of 4.76 microA cm(-2) microM(-1) has been obtained from the fabricated hexagonal-shaped ZnO nanorods based electrochemical sensor. The response time of the fabricated sensor was less than 10 s with a linear range from 0.2 to 2.0 microM and correlation coefficient of R = 0.9914. The limit of detection (LOD), based on S/N ratio was estimated to be 2.2 microM.</P>

ZnO Nanonails: Synthesis and Their Application as Glucose Biosensor

Umar, Ahmad,Rahman, M. M.,Kim, S. H.,Hahn, Y. B. American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.6

<P>Well-crystallized zinc oxide nanonails were grown in a high density by thermal evaporation process and were used as supporting matrixes for glucose oxidase (GOx) immobilization to construct efficient glucose biosensor. The GOx attached to the surfaces of ZnO nanonails had more spatial freedom in its orientation, which facilitated the direct electron transfer between the active sites of immobilized GOx and electrode surface. The fabricated biosensor showed a high sensitivity of 24.613 <I>μ</I>A cm<SUP>-2</SUP> mM<SUP>-1</SUP> with a response time less than 10 s. Moreover, it shows a linear range from 0.1 to 7.1 mM with a correlation coefficient of R = 0.9937 and detection limit of 5 <I>μ</I>M.</P>

Synthesis and Characterization of CuO Nanodisks for High-Sensitive and Selective Ethanol Gas Sensor Applications

Umar, Ahmad,Lee, Jong-Heun,Kumar, Rajesh,Al-Dossary, O. American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.2

<P>Herein, the fabrication and characterization of highly sensitive and selective ethanol gas sensor based on CuO nanodisks is reported. The CuO nanodisks were synthesized by facile hydrothermal process and detailed characterization revealed the well-crystallinity, high-purity and high density growth of the prepared material. To fabricate the ethanol gas sensor, the prepared nanodisks were coated on alumina substrate. The fabricated sensor exhibited high-sensitivity and the recorded gas response (resistance-ratio), response time (tau(res)) and recovery time (tau(recov)) were 6.2, 119 and 35 s, respectively for 100 ppm of C2H5OH at 300 degrees C. Further, the fabricated sensor shows high selectivity towards ethanol gas compared to H-2 and CO gases.</P>

Ethnobotanical survey and nutritional composition of medicinal plants used for traditional galactagogue practice in Katsina state, Nigeria

Umar Lawal,Rukayat T. Mohammed,Sani M. Gidado,Sulaiman S. Kankara 경희대학교 융합한의과학연구소 2023 Oriental Pharmacy and Experimental Medicine Vol.23 No.3

An ethnobotanical survey was conducted in Katsina state, Northern Nigeria to document medicinal plants commonly used by lactating mothers to boost breast milk production. Two hundred and forty (240) respondents made up of (120) nursing mothers, (60) herbalists and (60) traditional birth attendants were interviewed. Ethnobotanical data was obtained using the structured questionnaire method. Standard procedures were followed to analyse the phyto-chemical, proximate, mineral concentrations and chemical composition of the ethanolic extract of the most cited plants. Forty (40) plant species belonging to 38 genera distributed among 24 families are used as galactagogues in Katsina state, Nigeria. All the plant samples contained alkaloids, cardiac glycosides, flavonoids, saponins, tannins and terpenoids. Anthraquinones were found to be absent in Andropogon gayanus, Moringa oleifera and Pennisetum glaucum while phytosterol was absent in Pennisetum glaucum and Vernonia amygdalina. They were also found to contain nutrient compositions in varying amounts. Crotalaria retusa had the highest moisture (12.80%), crude lipid (13.50%) and crude fibre (21.76%) content. Momordica balsamina has the highest ash (13.76%) content. Pennisetum glaucum had the highest carbohydrate content (76.19%) and energy content (364.95%). Mineral analysis revealed that Andropogon gayanus, Momordica balsamina and Vernonia amygdalina showed equal phosphorus (0.3 ppm) contents. Crotalaria retusa showed the highest chromium (2.59 ppm) and copper (1.31 ppm) content. GC/MS analysis revealed that Momordica balsamina contained 99 phytoconstituents. With only 9,12-Octadecadienoic acid (Z,Z)- identified as the only phytoconstituents showing phytoestrogen activity. The indigenous knowledge about lactating mothers in Katsina state, Nigeria used medicinal plants to boost breast milk production is documented.