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Optimization Weighted Matrix of Non-Negative Matrix Factorization for Image Compression
Robin,Suharjito 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.3
Many methods have been applied in image compression and Non-negative matrix factorization (NMF) is one of some approach which could be applied in image compression. Non-Negative Matrix Factorization (NMF) was a realtively new approach to decompose data into two factors with non-negative entries. This paper shows that the NMF method can be applied in image compression using a model of 2x2 pixels weighted matrix rather than using the model of 200x200 pixels, 10x10 pixels and 4x4 pixels weighted matrix. This paper also shows that the 2x2 Weighted matrix model example of ((65536, 1), (1, 65536)) was the best weighted matrix for NMF image compression. Finally, this research proved that by using the weighted matrix with higher determinant value could gain smaller size compressed image.
Regulation of Wound Healing and Fibrosis by Hypoxia and Hypoxia-Inducible Factor-1
Robin J. Ruthenborg,반재준,Anum Wazir,Norihiko Takeda,Jung-whan Kim 한국분자세포생물학회 2014 Molecules and cells Vol.37 No.9
Wound healing is a complex multi-step process that requires spatial and temporal orchestration of cellular and non-cellular components. Hypoxia is one of the prominent microenvironmental factors in tissue injury and wound healing. Hypoxic responses, mainly mediated by a master transcription factor of oxygen homeostasis, hypoxia-inducible factor-1 (HIF-1), have been shown to be critically involved in virtually all processes of wound healing and remodeling. Yet, mechanisms underlying hypoxic regulation of wound healing are still poorly understood. Better understanding of how the wound healing process is regulated by the hypoxic microen¬vironment and HIF-1 signaling pathway will provide insight into the development of a novel therapeutic strategy for impaired wound healing conditions such as diabetic wound and fibrosis. In this review, we will discuss recent studies illuminating the roles of HIF-1 in physiologic and pathologic wound repair and further, the therapeutic potentials of HIF-1 stabilization or inhibition.
Robin Kundrata,Eliska Sormova,Lu Qiu 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.1
Sinodima gen. nov., a new genus in the click-beetle tribe Dimini Candèze, 1863 from the mountains in Hunan, China, is described and figured here to accommodate S. jenisi sp. nov. The new genus is easily recognizable from all other Dimini by the following combination of characters: short antennomeres II and III; transverse pronotum with inconspicuous anterior angles; arcuate prosternal process; mesoventrite with straight frontal margin and oblique and straight sides; absent hind wings; and absent sclerites or spines in the bursa copulatrix. Additionally, we compare Sinodima gen. nov. with the morphologically similar genera, and discuss the systematic position of this genus within Dimini.
Issues in Probabilistic Seismic Hazard Analysis for Nuclear Facilities in the US
Robin K. McGuire 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.10
Probabilistic seismic hazard analysis (PSHA) is routinely conducted in the US for nuclear plants, for the determination of appropriate seismic design levels. These analyses incorporate uncertainties in earthquake characteristics in stable continental regions (where direct observations of large earthquakes are rare), in estimates of rock motions, in site effects on strong shaking, and in the damage potential of seismic shaking for engineered facilities. Performance goals related to the inelastic deformation of individual components, and related to overall seismic core damage frequency, are used to determine design levels. PSHA has the ability to quantify and document the important uncertainties that affect seismic design levels, and future work can be guided toward reducing those uncertainties.
A Leakage-Based Solution for Interference Alignment in MIMO Interference Channel Networks
( Robin Shrestha ),( Insan Bae ),( Jae Moung Kim ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.2
Most recent research on iterative solutions for interference alignment (IA) presents solutions assuming channel reciprocity based on the suppression of interference from undesired sources by using an appropriate decoding matrix also known as a receiver combining matrix for multiple input multiple output (MIMO) interference channel networks and reciprocal networks. In this paper, we present an alternative solution for IA by designing precoding and decoding matrices based on the concept of signal leakage (the measure of signal power that leaks to unintended users) on each transmit side. We propose an iterative algorithm for an IA solution based on maximization of the signal-to-leakage-and-noise ratio (SLNR) of the transmitted signal from each transmitter. In order to make an algorithm removing the requirement of channel reciprocity, we deploy maximization of the signal-to-interference-and-noise ratio (SINR) in the design of the decoding matrices. We show through simulation that minimizing the leakage in each transmission can help achieve enhanced performance in terms of aggregate sum capacity in the system.
Effects of auditory stimuli on the lifespan of Drosophila melanogaster
Robin F. MORALES,성기문,김차순,진영우,민경진 한국곤충학회 2010 Entomological Research Vol.40 No.4
It is well known that music can have calming effects on humans, other mammals and birds. Reducing environmental stress or enhancing the resistance to certain stressors has been shown to extend lifespan in several organisms. Evidence also suggests that mild temporary stress may also enhance stress resistance and ultimately slow the aging process. This study explored the possibility that music may influence the lifespan of the fruit fly Drosophila melanogaster, possibly by affecting responses to stress. Flies received either background sounds (control), or background sounds supplemented with music (experimental). The experimental group had classical music playing constantly at an average of 20 dB above background sound. The median lifespan of females receiving music was 42 days compared to the median of 45 days without music, but the difference was not significant. For males median lifespans were 42 days with music exposure, and 47 days without music and the difference was significant. These results suggest that exposure to classical music decreased the lifespan of male Drosophila. Both experimental and control populations showed age-dependent increases in mortality, indicating that music affects the normal aging process rather than showing overt toxicity. These results suggest that certain auditory stimuli may be stressful and can be used as insect management.
Nuclear Data Activities in the International Atomic Energy Agency-Nuclear Data Section (IAEA-NDS)
Robin A. Forrest 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
As part of its function the IAEA-NDS coordinates and supports nuclear data activities in the fields of neutron and charged-particle reactions and nuclear structure and decay data, and disseminates the resulting reports and databases. The NDS coordinates two international nuclear networks (and one atomic and molecular) - the International Network of Nuclear Reaction Data Centres (NRDC) and the International Network of Nuclear Structure and Decay Data Evaluators (NSDD). The NDS staff are also involved in several compilations and evaluations of nuclear data. Main activities include compilation for NSR and EXFOR, evaluation for ENSDF and DDEP and evaluation of neutron and charged-particle reaction cross sections and covariances. Most of the NDS support for nuclear data activities is in the form of Coordinated Research Projects and Data Development Projects; a summary of past, present and future activities is presented.