• Title/Summary/Keyword: Mobilities

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Advertisement Dissemination Scheme Using User Preferences in Mobile P2P Environments (모바일 P2P 환경에서 사용자 선호도를 이용한 광고 전송 기법)

  • Jeong, Jiwon;Lee, Suji;Yun, Jinkyoung;Lim, Jongtae;Shin, Jaeryong;Bok, Kyoungsoo;Yoo, Jaesoo
    • The Journal of the Korea Contents Association
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    • v.15 no.12
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    • pp.35-49
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    • 2015
  • Recently, with the development of wireless communication technologies and mobile equipments, various studies on mobile P2P networks have been conducted. In this paper, we propose an advertisement dissemination method considering peer's mobilities and preferences in mobile P2P networks. The proposed scheme generates a peer's preference through the analysis of users' activities to disseminate advertisements with user preferences. To reduce duplicated advertising messages and improve reception ratio, the priority of advertisement re-dissemination is determined according to peer's preferences, mobilities, and advertisement reception ratio. We improve the participation rate of the advertisement dissemination of mobile peers using the incentive mechanism in mobile P2P networks. To show the superiority of the proposed scheme, we compare it with the existing scheme in terms of the number of messages and accuracy.

Characteristics of Rolling Noise Sources of Tram Resilient Wheels and Track (트램의 탄성차륜과 궤도의 전동 소음원 특성에 관한 연구)

  • Jang, Seungho;Ryue, Jungsoo
    • Journal of the Korean Society for Railway
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    • v.18 no.3
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    • pp.212-222
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    • 2015
  • The characteristics of noise emission from tram systems should be investigated in order to design and construct an urban tram network that raises fewer environmental noise problems. In this paper, the characteristics of rolling noise from a tram were studied and a desired stiffness of the rail supports was proposed using a noise prediction model. The mobilities of embedded rails and resilient wheels were predicted using the Timoshenko beam model and the finite element model, respectively. The predicted mobilities were compared with the measured results. Compared with the measured values, the calculated noise level near the track showed small errors for frequencies higher than 300 Hz. Then, the source strengths of rail and wheel components were examined by varying the rail supporting stiffness and the slab supporting stiffness so that suitable stiffness values could be estimated that would reduce noise radiated from rails and wheels but that would not greatly increase the ground vibration.

Electrophoretic Mobilities of the Potato Spindle Tuber Viroid RNA Molecules in the Urea-Gradient Gels (감자 걀쪽바이로드(PSTV) RNA 분자의 요소농도기울기겔에서 전기영동적 이동성에 관하여)

  • 이재열
    • Korean Journal of Microbiology
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    • v.25 no.1
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    • pp.23-27
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    • 1987
  • Low molecular weight plant ribonucleic acids including viroid-RNA molecules which are soluble in 2M lithium chloride were electrophoresed in the 0M to 8M urea-gradient polyacrylamide gel. Although the linear viroid-RNA molecules migrated at a similarrate across the urea-gradient gel under the denaturing temperature, the circular viroid-RNA molecules moved more rapidly at low urea-gradient region than at high urea-gradient region. Consequently, the migration of the circular viroid-RNA molecules showed a sudden shift across the band of linear forms in the midrange of the urea-gradient gels. Electrophoretic mobilities of the circular viroid-RNA molecules seemed to depend mainly on the concentration of urea in the denaturing urea-gradient gels.

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Non-Steady State Gas Permeation Measurements of $TiO_2$-Doped YSZ

  • Kobayashi, Kiyoshi;Yamaguchi, Shu;Iguchi, Yoshiaki
    • The Korean Journal of Ceramics
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    • v.6 no.2
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    • pp.150-154
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    • 2000
  • Mobilities of electrons ($\mu_p$) and holes ($\mu_p$) in 2, 5, and 10 mol% $TiO_2$-doped yttria stabilized zirconia (TD-YSZ) have been estimated by a non-steady state gas permeation method using models proposed by Weppner and Maruyama. Values of $\mu_n$ and $\mu_p$ were found to be closed to those in non-doped YSZ reported earlier. The concentration of electrons and holes were calculated from $\mu_n$ and $\mu_p$ values and the partial conductivities of electrons and holes measured by a dc-polarization method. The concentration of electrons at unit oxygen partial pressure increased with increasing $TiO_2$concentration, while the hole concentration was almost independent of $TiO_2$concentration.

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Basics of Ion Mobility Mass Spectrometry

  • Lee, Jong Wha
    • Mass Spectrometry Letters
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    • v.8 no.4
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    • pp.79-89
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    • 2017
  • Ion mobility mass spectrometry (IM-MS) combines the advantages of ion mobility spectrometry (IMS) and MS for effective gas-phase ion analysis. Separation of ions based on their mobilities prior to MS can be performed without a great loss in other analytical figures of merit, and the extra dimension of analysis offered by IM can be beneficial for isomer and complex sample analyses. In this review, basic principles of IMS and IM-MS are described in addition to an introduction to various IMS techniques and commercial IM-MS instruments. The nature of collision cross-section (${\Omega}_D$), an important parameter determining the transport properties of ions in IMS, is also explained in detail.

Frequency Window Method for the Vibration of Primary-Secondary Structural Systems (Frequency Window Method에 의한 1차-2차 구조시스템의 진동특성)

  • 민경원
    • Journal of KSNVE
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    • v.1 no.1
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    • pp.45-52
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    • 1991
  • The dynamic properties of primary-secondary structural systems are examined using analytical expressions for the modal properties. The analysis begins with a Lagrange multiplier formulation to develop a characteristic equation in terms of primary system mobilities and secondary system impedances. The complexity of the characteristic equation by developing new method, frequency window method. It is shown that the reduction of complexity can only be obtained by a reduction of accuracy, but by retaining the dominant effects of the dynamics problem, the loss of accuracy is not excessive. The reduced problem is examined further to develop simple expressions for the modal properties which provide insight into the resonance characteristics of the primary-secondary system problem. The results are useful as a complement to existing computational techniques for understanding and interpreting dynamic analysis results.

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An Engine Structure-Borne Noise Analysis by Finite Element Method (유한요소법에 의한엔진 구조소음 해석)

  • 안상호;김주연;김규철
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.1
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    • pp.122-133
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    • 1998
  • This paper presents the static analysis, the modal analysis and the forced vibration analysis on engine structures to find out the structure-borne noise sources by finite element method. The deformation of engine structures under the maximum combu- stion gas force was calculated through the static analysis, and the resonance possibilities were predicted by the modal analysis which ascertains mode shapes and the corresponding frequencies of engine global and its major noise sources in engine surfaces were investigated with the forced vibration analysis by means of finding the transfer mobilities on engine surfaces due to the piston impact and the velocity levels due to the combustion in consideration of oil film stiffness and damping coefficients. Finally, the direction of engine structure-borne noise reduction can be estabilished by the above-mentioned analysis procedure and the reduction effect of cost on proto-type engine build-up is expected.

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Study on characterization of OTFT for patterned active layer P3HT using conventional photolithography (포토리소그래피를 이용한 P3HT 활성층의 패터닝에 의한 OTFT 특성 연구)

  • Park, Kyeong-Dong;Han, Kyo-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.11a
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    • pp.9-10
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    • 2006
  • The patterning for the active layer of organic semiconductors is important to attain completely organic-based OTFTs(Organic Thin Film Transistors). We studied on possibility of the application of the conventional photolithography technique to pattern the organic active layer poly(3-hexylthiophene)(P3HT). Patterned P3HT-based OTFTs with Bottom Contact(BC) configuration were fabricated using the conventional photolithography. We achieved field-effect mobilities in the saturation regime ${\sim}1.2{\times}10^{-3}cm^2/V{\cdot}s$, $I_{on/off}$ ratios ${\sim}10^5$ in the subtractive method, ${\sim}8{\times}10^{-4}cm^2/V{\cdot}s$, $I_{on/off}$ ratios ${\sim}10^3$ in the additive one.

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Comparative Study on Cytochrome Oxidase of Rat Muscle Tissues (쥐 근조직의 Cytochrome Oxidase에 대한 비교 연구)

  • Song, Eun-Sook
    • The Korean Journal of Zoology
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    • v.29 no.1
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    • pp.70-74
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    • 1986
  • Cytochrome oxidase activities have been compared from crude sumibitochondrial preparations of rat skeletal muscle tissues. Fast red (type $II_A$) preparation has highest cytochrome oxidase activity, slow red (type I) next, and fast white (type $II_B$) the lowest. Differences of electrophoretic mobilities have been detected by heme staining. Migration of heme band is in the order of slow red>fast red>fast white from fastest to slowest. Results of immunoelectrophoresis have substantiated the above finding.

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An Experimental Study on the Effects of Aebaegeum Applicable to the Treatment of Epistaxis (鼻出血에 應用되는 艾柏飮의 效能에 關한 實驗的 硏究)

  • Hong, Ik-Pyo;Chae, Byeong-Yun
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.3 no.1
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    • pp.1-15
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    • 1990
  • Aebaegeum has been widely used in the treatment of epistaxis, as based on Oriental Medical 1iteratures. In order to investigate experimentally the clinical effects of Aebaegeum, hemostatic time, plasma recalcification time and prothrombin time of hypoprothrombinemia induced by warfarin injection, action on isolated ileum, action on blood vessel, action on blood pressure and respiration and action on heart were observed. The result of the studies were obtained as follows: 1. Hemostatic time of vein ruptured mice was significantly shortened. 2. Plasma recalification time and prothrombin time of hypoprothrombinemic rats induced by warfarin injection were significantly shortened. 3. Spontaneous mobilities in the isolated ileum of mice were significantly suppressed, and contraction by acetylcholine chloride and barium chloride were inhibited. 4. Dilatation of blood vessel and downing of blood pressure of rabbit were noted. 5. Contraction of heart in the original position and isolated heart of frog were significantly shortened. According to the above result, it is expected that Aebaegeum can be widely applicable to the treatment of epistaxis.

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