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Search Results: 1 - 10 of 11556 matches for " Mi-Ra Oh "
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The design of the data preprocessing using AHP in automatic meter reading system
Mi-Ra Kim,Dong-Sub Cho
International Journal of Computer Science Issues , 2013,
Abstract: The smart grid is an electrical grid that uses information and communications technology to gather and act on information, such as information about the behaviors of suppliers and consumers, in an automated fashion to improve the efficiency, reliability, economics, and sustainability of the production and distribution of electricity. In the smart grid environment, it is a very important factor that would telemeter the factory, home and building to measure the amount of electricity telemetering would measure the amount of electricity using network and IT technology, and transmit to the server. Using the telemetering, it would measure the real time electrical load, and control the electrical demand. There is a big difference between the data in the automatic meter reading system. It is coming to be important that the efficient data treatability between central control server and the remote automatic meter unit. The delay will be able to occur when controlling a numerous termination provision from server. We design and implement a total method that controls the mass data using the support vector machine(SVM) automatic meter reading system. SVM performs classification by constructing an N-dimensional hyperplane that optimally separates the data into two categories. When the server handle the data from automatic meter reading system, we use the automatic meter reading systems priority using SVM algorithms. In this paper, we propose a method in the remote meter reading data, when processed using SVM and Packet Priority Algorithm using AHP data preprocessing. In Remote meter reading data, the data preprocessing is used to obtain the weights using the AHP. It would be increase the server's efficiency and accuracy.
Difficulties in analytic computation for relative entropy of entanglement
Hungsoo Kim,Mi-Ra Hwang,Eylee Jung,DaeKil Park
Physics , 2010, DOI: 10.1103/PhysRevA.81.052325
Abstract: It is known that relative entropy of entanglement for entangled state $\rho$ is defined via its closest separable (or positive partial transpose) state $\sigma$. Recently, it has been shown how to find $\rho$ provided that $\sigma$ is given in two-qubit system. In this paper we study on the inverse process, i.e. how to find $\sigma$ provided that $\rho$ is given. It is shown that if $\rho$ is one of Bell-diagonal, generalized Vedral-Plenio and generalized Horodecki states, one can always find $\sigma$ from a geometrical point of view. This is possible due to the following two facts: (i) The Bloch vectors of $\rho$ and $\sigma$ are identical with each other (ii) The qubit-interaction vector of $\sigma$ can be computed from a crossing point between minimal geometrical object, in which all separable states reside in the presence of Bloch vectors, and a straight line, which connects the point corresponding to the qubit-interaction vector of $\rho$ and the nearest vertex of the maximal tetrahedron, where all two-qubit states reside. It is shown, however, that these nice properties are not maintained for the arbitrary two-qubit states.
Three-Party Entanglement in Tripartite Teleportation Scheme through Noisy Channels
Eylee Jung,Mi-Ra Hwang,DaeKil Park,Sayatnova Tamaryan
Physics , 2009,
Abstract: We have tried to interpret the physical role of the three-tangle and $\pi$-tangle in the real physical information process. For the model calculation we adopt the three-party teleportation scheme through the various noisy channels. The three parties consist of sender, accomplice and receiver. It is shown that the $\pi$-tangles for the X- and Z-noisy channels vanish at $\kappa t \to \infty$ limit, where $\kappa t$ is a parameter introduced in the master equation of Lindblad form. In this limit the receiver's maximum fidelity reduces to the classical limit 2/3. However, this nice feature is not maintained at the Y- and isotropy-noise channels. For Y-noise channel the $\pi$-tangle vanishes at $0.61 \leq \kappa t$. At $\kappa t = 0.61$ the receiver's maximum fidelity becomes 0.57, which is much less than the classical limit. Similar phenomenon occurs at the isotropic noise channel. We also computed the three-tangles analytically for the X- and Z-noise channels. The remarkable fact is that the three-tangle for Z-noise channel is exactly same with the corresponding $\pi$-tangle. In the X-noise channel the three-tangle vanishes at $0.10 \leq \kappa t$. At $\kappa t = 0.10$ the receiver's fidelity can be reduced to the classical limit provided that the accomplice performs the measurement appropriately. However, the receiver's maximum fidelity becomes 8/9, which is much larger than the classical limit. Since the Y- and isotropy-noise channels are rank-8 mixed states, their three-tangles are not computed explicitly. Instead, we have derived their upper bounds with use of the analytical three-tangles for other noisy channels. Our analysis strongly suggests that we need different three-party entanglement measure whose value is between three-tangle and $\pi$-tangle.
Aharonov-Bohm-Coulomb Problem in Graphene Ring
Eylee Jung,Mi-Ra Hwang,ChangSoo Park,DaeKil Park
Physics , 2011, DOI: 10.1088/1751-8113/45/5/055301
Abstract: We study the Aharonov-Bohm-Coulomb problem in a graphene ring. We investigate, in particular, the effects of a Coulomb type potential of the form $\xi/r$ on the energy spectrum of Dirac electrons in the graphene ring in two different ways: one for the scalar coupling and the other for the vector coupling. It is found that, since the potential in the scalar coupling breaks the time-reversal symmetry between the two valleys as well as the effective time-reversal symmetry in a single valley, the energy spectrum of one valley is separated from that of the other valley, demonstrating a valley polarization. In the vector coupling, however, the potential does not break either of the two symmetries and its effect appears only as an additive constant to the spectrum of Aharonov-Bohm potential. The corresponding persistent currents, the observable quantities of the symmetry-breaking energy spectra, are shown to be asymmetric about zero magnetic flux in the scalar coupling, while symmetric in the vector coupling.
A placebo-controlled trial of Korean red ginseng extract for preventing Influenza-like illness in healthy adults
Ki-Chan Ha, Min-Gul Kim, Mi-Ra Oh, Eun-Kyung Choi, Hyang-Im Back, Sun-Young Kim, Eun-Ok Park, Dae-Young Kwon, Hye-Jeong Yang, Min-Jeong Kim, Hee-Joo Kang, Ju-Hyung Lee, Kyung-Min Choi, Soo-Wan Chae, Chang-Seop Lee
BMC Complementary and Alternative Medicine , 2012, DOI: 10.1186/1472-6882-12-10
Abstract: We will conduct a randomized, double-blind, placebo-controlled study at the onset of the influenza seasons. A total of 100 subjects 30-70 years of age will be recruited from the general populations. The subjects will be instructed to take 9 capsules per day of either the KRG extract or a placebo for a period of 3 months. The primary outcome measure is to assess the frequency of ILI onset in participated subjects. Secondary variable measures will be included severity and duration of ILI symptoms. The ILI symptoms will be scored by subjects using a 4-point scale.This study is a randomized placebo controlled trial to evaluate the efficacy of the KRG extract compared to placebo and will be provided valuable new information about the clinical and physiological effects of the KRG extract on reduction of ILI incidence including flu and upper respiratory tract infections. The study has been pragmatically designed to ensure that the study findings can be implemented into clinical practice if KRG extract can be shown to be an effective reduction strategy in ILI incidence.NCT01478009.Respiratory viruses are a major cause of influenza-like illness(ILI) symptoms in children and adults, leading to substantial morbidity and mortality each year [1-5]. The complications of ILI symptoms may occur in young children (< 1 year old) and elderly people (> 65 years old), even though ILI symptoms is most often self-limited and restrained to the upper respiratory tract [6-8]. The ILI symptoms is characterized by sudden onset of symptoms such as high fever (> 38°C) and cough in the absence of other diagnosis [9,10]. Other symptoms including myalgia, headache, chills and fatigue can only be used as optional inclusion criteria. Although it is known that rhinovirus infections cause 10% to 40% of the upper respiratory tract infection [11], with coronavirus, parainfluenza virus, adenovirus, echovirus, and coxsackievirus accounting for the remainder of cases [12,13], these viruses produce clinicall
Antioxidant Activities of Hot Water Extracts from Various?Spices
Il-Suk Kim,Mi-Ra Yang,Ok-Hwan Lee,Suk-Nam Kang
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12064120
Abstract: Recently, the natural spices and herbs such as rosemary, oregano, and caraway have been used for the processing of meat products. This study investigates the antioxidant activity of 13 spices commonly used in meat processing plants. The hot water extracts were then used for evaluation of total phenolic content, total flavonoids content and antioxidant activities. Our results show that the hot water extract of oregano gave the highest extraction yield (41.33%) whereas mace (7.64%) gave the lowest. The DPPH radical scavenging ability of the spice extracts can be ranked against ascorbic acid in the order ascorbic acid > clove > thyme > rosemary > savory > oregano. The values for superoxide anion radical scavenging activities were in the order of marjoram > rosemary > oregano > cumin > savory > basil > thyme > fennel > coriander > ascorbic acid. When compared to ascorbic acid (48.72%), the hydroxyl radical scavenging activities of turmeric and mace were found to be higher (p < 0.001). Clove had the highest total phenolic content (108.28 μg catechin equivalent (CE)/g). The total flavonoid content of the spices varied from 324.08 μg quercetin equivalent (QE)/g for thyme to 3.38 μg QE/g for coriander. Our results indicate that hot water extract of several spices had a high antioxidant activity which is partly due to the phenolic and flavonoid compounds. This provides basic data, having implications for further development of processed food products.
Mixed-State Entanglement and Quantum Teleportation through Noisy Channels
Eylee Jung,Mi-Ra Hwang,DaeKil Park,Jin-Woo Son,S. Tamaryan
Physics , 2008, DOI: 10.1088/1751-8113/41/38/385302
Abstract: The quantum teleportation with noisy EPR state is discussed. Using an optimal decomposition technique, we compute the concurrence, entanglement of formation and Groverian measure for various noisy EPR resources. It is shown analytically that all entanglement measures reduce to zero when $\bar{F} \leq 2/3$, where $\bar{F}$ is an average fidelity between Alice and Bob. This fact indicates that the entanglement is a genuine physical resource for the teleportation process. This fact gives valuable clues on the optimal decomposition for higher-qubit mixed states. As an example, the optimal decompositions for the three-qubit mixed states are discussed by adopting a teleportation with W-state
Perfect Quantum Teleportation and Superdense coding with $P_{max} = 1/2$ states
Eylee Jung,Mi-Ra Hwang,DaeKil Park,Jin-Woo Son,S. Tamaryan
Physics , 2007,
Abstract: We conjecture that criterion for perfect quantum teleportation is that the Groverian entanglement of the entanglement resource is $1/\sqrt{2}$. In order to examine the validity of our conjecture we analyze the quantum teleportation and superdense coding with $|\Phi> = (1/\sqrt{2}) (|00q_1> + |11q_2>)$, where $|q_1>$ and $|q_2>$ are arbitrary normalized single qubit states. It is shown explicitly that $|\Phi>$ allows perfect two-party quantum teleportation and superdense coding scenario. Next we compute the Groverian measures for $|\psi>=\sqrt{1/2 - b^2}|100>+b |010>+a|001> +\sqrt{1/2-a^2}|111>$ and $|\tilde{\psi}>=a|000>+b|010>+\sqrt{1/2 - (a^2+b^2)}|100> + (1/\sqrt{2}) |111>$, which also allow the perfect quantum teleportation. It is shown that both states have $1/\sqrt{2}$ Groverian entanglement measure, which strongly supports that our conjecture is valid.
Three-Qubit Groverian Measure
Eylee Jung,Mi-Ra Hwang,DaeKil Park,Levon Tamaryan,Sayatnova Tamaryan
Physics , 2008,
Abstract: The Groverian measures are analytically computed in various types of three-qubit states. The final results are also expressed in terms of local-unitary invariant quantities in each type. This fact reflects the manifest local-unitary invariance of the Groverian measure. It is also shown that the analytical expressions for various types have correct limits to other types. For some types (type 4 and type 5) we failed to compute the analytical expression of the Groverian measure in this paper. However, from the consideration of local-unitary invariants we have shown that the Groverian measure in type 4 should be independent of the phase factor $\phi$, which appear in the three-qubit state $|\psi>$. This fact with geometric interpretation on the Groverian measure may enable us to derive the analytical expressions for general arbitrary three-qubit states in near future.
Three-Tangle for Rank-3 Mixed States: mixture of Greenberger-Horne-Zeilinger, W and flipped W states
Eylee Jung,Mi-Ra Hwang,DaeKil Park,Jin-Woo Son
Physics , 2008, DOI: 10.1103/PhysRevA.79.024306
Abstract: Three-tangle for the rank-three mixture composed of Greenberger-Horne-Zeilinger, W and flipped W states is analytically calculated. The optimal decompositions in the full range of parameter space are constructed by making use of the convex-roof extension. We also provide an analytical technique, which determines whether or not an arbitrary rank-3 state has vanishing three-tangle. This technique is developed by making use of the Bloch sphere S^8 of the qutrit system. The Coffman-Kundu-Wootters inequality is discussed by computing one-tangle and concurrences. It is shown that the one-tangle is always larger than the sum of squared concurrences and three-tangle. The physical implication of three-tangle is briefly discussed.
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