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The User Terminal Registration Method in Proximity Using the Virtual ISIM for Providing Service Continuity (가상 ISIM을 통한 서비스 연속성 제공을 위한 근접 단말 등록 방법)

  • Yim, Jong-Choul;Kim, Sang-Ha;Keum, Chang-Sup
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.3
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    • pp.529-540
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    • 2015
  • The NGN should support an ubiquitous environment in which users can use multiple devices. Especially, services should be provided to users in a seamless manner across multiple devices which are dynamically found in users' vicinity. Therefore, supporting service continuity is essential in the NGN. Currently the IMS, which is a session control layer for the NGN, deals with session control procedures in detail for service continuity. However, the IMS provides limited methods how users can find target terminals for transferring the session. The target terminals tend to be located near in user's physical location, and could be shared among different users. For providing better service experience in the NGN, The NGN needs to encompass methods to enable for users to use the dynamically-found terminals in users' vicinity seamlessly. In this paper, we introduce a novel registration method based on virtual ISIM by which the target terminals in user's vicinity can register themselves to the IMS, and also we discuss how service continuity is supported.

Measurement of Aerodynamic Heating over a Protuberance in Hypersonic Flow of Mach 7 (Mach 7 극초음속 유동 내의 돌출물 공력가열 계측)

  • Lee, Hyoung-Jin;Lee, Bok-Jik;Jeung, In-Seuck;Kim, Seong-Lyong;Kim, In-Sun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.6
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    • pp.562-570
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    • 2009
  • An Experimental study was conducted on the flow characteristics and interference heating caused by a two-dimensional object protruding from a flat plate using a blow-down type of hypersonic wind tunnel. Inflow condition was a free-stream Mach number of 7.0 and a unit Reynolds number of $2.0{\times}10^6/m$. Experimental conditions were varied with three heights of protuberance for two flat plate models which have different lengths. Experimental data were obtained from Schlieren visualization images and heat flux measurements. Also, this paper suggests hypersonic experimental techniques such as boundary-layer detection method in detail. A Large separation region was observed in front of the protuberance and that region was very sensitive to the height of protuberance and the length of the flat plate. For only the highest protuberance, a severe jump of heat flux was observed at the top station among the measuring points. Measured heat flux is large when the height of protuberance is large and the length of flat plate is long.

Study of Post-silicidation Annealing Effect on SOI Substrate (SOI 기판에서 Silicide의 후속 공정 열처리 영향에 대한 연구)

  • Lee, Won-Jae;Oh, Soon-Young;Kim, Yong-Jin;Zhang, Ying-Ying;Zhong, Zhun;Lee, Shi-Guang;Jung, Soon-Yen;Kim, Yeong-Cheol;Wang, Jin-Suk;Lee, Hi-Deok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.3-4
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    • 2006
  • In this paper, a nickel silicide technology with post-silicidation annealing effect for thin film SOI devices is investigated in detail. Although lower resistivity Ni silicide can be easily obtained at low forming temperature, poor thermal stability and changing of characteristic are serious problems during the post silicidation annealing like ILD (Inter Layer Dielectric) deposition or metallization. So these effects are observed as deposited Ni thickness differently on As doped SOI (Si film 30nm). Especially, the sheet resistance of Ni thickness deposited 20nm was lower than 30nm before the post silicidation annealing. But after the post silicidation annealing, the sheet resistance was changed. Therefore, in thin film SOI MOSFETs or Ni-FUSI technology that the Si film is less than 50nm, it is important to decide the thickness of deposited Ni in order to avoid forming high resistivity silicide.

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Envelope development and variation in Trachelomonas hispida (Euglenophyta)

  • Poniewozik, Malgorzata;Zieba, Emil;Sajnaga, Ewa
    • ALGAE
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    • v.33 no.4
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    • pp.305-318
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    • 2018
  • In Trachelomonas hispida, the adult envelope that surrounds the monad is oval in shape and covered with spines. Development of the lorica is an interesting, but poorly known phenomenon. We observed in detail the formation of spineless envelopes of T. hispida using light microscopy and scanning electron microscopy. The results showed that young cells formed delicate and net-like envelopes. The structure changed with age, and mature specimens had solid, thick loricae with small pores. As the loricae aged, they changed their shape, and rope-like fibres from the external layer started to unwind, progressing from the apical pore, exposing the underlying net-like structure. X-ray spectrometry showed that Fe was the major mineral component in young and mature loricae, whereas old loricae did not contain Fe salts, although they did contain a high number of Mn compounds. We also noticed a different pattern of mineralization process in the envelopes. Apart from the even distribution of mineral deposition over the entire lorica, we observed that it started from the apical pore and ended at the posterior end. There was considerable morphological variation in envelope shape and ornamentation, which had collars and folds around the apical pore and process at the posterior end. This suggested that many varieties of T. hispida should be taxonomically reappraised. We also discuss a hypothetical role for the spines on lorica surfaces in aquatic ecosystems.

Using neural networks to model and predict amplitude dependent damping in buildings

  • Li, Q.S.;Liu, D.K.;Fang, J.Q.;Jeary, A.P.;Wong, C.K.
    • Wind and Structures
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    • v.2 no.1
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    • pp.25-40
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    • 1999
  • In this paper, artificial neural networks, a new kind of intelligent method, are employed to model and predict amplitude dependent damping in buildings based on our full-scale measurements of buildings. The modelling method and procedure using neural networks to model the damping are studied. Comparative analysis of different neural network models of damping, which includes multi-layer perception network (MLP), recurrent neural network, and general regression neural network (GRNN), is performed and discussed in detail. The performances of the models are evaluated and discussed by tests and predictions including self-test, "one-lag" prediction and "multi-lag" prediction of the damping values at high amplitude levels. The established models of damping are used to predict the damping in the following three ways : (1) the model is established by part of the data measured from one building and is used to predict the another part of damping values which are always difficult to obtain from field measurements : the values at the high amplitude level. (2) The model is established by the damping data measured from one building and is used to predict the variation curve of damping for another building. And (3) the model is established by the data measured from more than one buildings and is used to predict the variation curve of damping for another building. The prediction results are discussed.

Effect of Organic Solvent Extractives on Korean Softwoods Classification Using Near-infrared Spectroscopy

  • Yeon, Seungheon;Park, Se-Yeong;Kim, Jong-Hwa;Kim, Jong-Chan;Yang, Sang-Yun;Yeo, Hwanmyeong;Kwon, Ohkyung;Choi, In-Gyu
    • Journal of the Korean Wood Science and Technology
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    • v.47 no.4
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    • pp.509-518
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    • 2019
  • This study analyzed the effect of organic solvent extractives on the classification of wood species via near-infrared spectroscopy (NIR). In our previous research, five species of Korean softwood were classified into three groups (i.e., Cryptomeria japonica (cedar)/Chamaecyparis obtuse (cypress), Pinus densiflora (red pine)/Pinus koraiensis (Korean pine), and Larix kaempferi (Larch)) using an NIR-based principal component analysis method. Similar tendencies of extractive distribution were observed among the three groups in that study. Therefore, in this study, we qualitatively analyzed extractives extracted by an organic solvent and analyzed the NIR spectra in terms of the extractives' chemical structure and band assignment to determine their effect in more detail. Cedar/cypress showed a similar NIR spectra patterns by removing the extractives at 1695, 1724, and 2291 nm. D-pinitol, which was detected in cedar, contributed to that wavelength. Red pine/Korean pine showed spectra changes at 1616, 1695, 1681, 1705, 1724, 1731, 1765, 1780, and 2300 nm. Diterpenoids and fatty acid, which have a carboxylic group and an aliphatic double bond, contributed to that wavelength. Larch showed a catechin peak in gas chromatography and mass spectroscopy analysis, but it exhibited very small NIR spectra changes. The aromatic bond in larch seemed to have low sensitivity because of the 1st overtone of the O-H bond of the sawdust cellulose. The three groups sorted via NIR spectroscopy in the previous research showed quite different compositions of extractives, in accordance with the NIR band assignment. Thus, organic solvent extractives are expected to affect the classification of wood species using NIR spectroscopy.

Atmospheric Pressure Plasma Etching Technology for Forming Circular Holes in Perovskite Semiconductor Materials (페로브스카이트 반도체 물질에 원형 패턴을 형성하기 위한 상압플라즈마 식각 기술)

  • Kim, Moojin
    • Journal of Convergence for Information Technology
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    • v.11 no.2
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    • pp.10-15
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    • 2021
  • In this paper, we formed perovskite (CH3NH3PbI3) thin films on glass with wet coating methods, and used various analytical techniques to discuss film thickness, surface roughness, crystallinity, composition, and optical property. The coated semiconductor material has no defects and is uniform, the surface roughness value is very small, and a high absorption rate has been observed in the visible light area. Next, in order to implement the hole shape in the organic-inorganic layer, Samples in the order of a metal mask with holes at regular intervals, a glass coated with a perovskite material, and a magnet were etched with atmospheric pressure plasma equipment. The shape of the hole formed in the perovskite material was analyzed by changing the time. It can be seen that more etching is performed as the time increases. The sample with the longest processing time was examined in more detail, and it was classified into 7 regions by the difference according to the location of the plasma.

Deep Learning based Skin Lesion Segmentation Using Transformer Block and Edge Decoder (트랜스포머 블록과 윤곽선 디코더를 활용한 딥러닝 기반의 피부 병변 분할 방법)

  • Kim, Ji Hoon;Park, Kyung Ri;Kim, Hae Moon;Moon, Young Shik
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.26 no.4
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    • pp.533-540
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    • 2022
  • Specialists diagnose skin cancer using a dermatoscopy to detect skin cancer as early as possible, but it is difficult to determine accurate skin lesions because skin lesions have various shapes. Recently, the skin lesion segmentation method using deep learning, which has shown high performance, has a problem in segmenting skin lesions because the boundary between healthy skin and skin lesions is not clear. To solve these issues, the proposed method constructs a transformer block to effectively segment the skin lesion, and constructs an edge decoder for each layer of the network to segment the skin lesion in detail. Experiment results have shown that the proposed method achieves a performance improvement of 0.041 ~ 0.071 for Dic Coefficient and 0.062 ~ 0.112 for Jaccard Index, compared with the previous method.

Non-Gaussian features of dynamic wind loads on a long-span roof in boundary layer turbulences with different integral-scales

  • Yang, Xiongwei;Zhou, Qiang;Lei, Yongfu;Yang, Yang;Li, Mingshui
    • Wind and Structures
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    • v.34 no.5
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    • pp.421-435
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    • 2022
  • To investigate the non-Gaussian properties of fluctuating wind pressures and the error margin of extreme wind loads on a long-span curved roof with matching and mismatching ratios of turbulence integral scales to depth (Lux/D), a series of synchronized pressure tests on the rigid model of the complex curved roof were conducted. The regions of Gaussian distribution and non-Gaussian distribution were identified by two criteria, which were based on the cumulative probabilities of higher-order statistical moments (skewness and kurtosis coefficients, Sk and Ku) and spatial correlation of fluctuating wind pressures, respectively. Then the characteristics of fluctuating wind-loads in the non-Gaussian region were analyzed in detail in order to understand the effects of turbulence integral-scale. Results showed that the fluctuating pressures with obvious negative-skewness appear in the area near the leading edge, which is categorized as the non-Gaussian region by both two identification criteria. Comparing with those in the wind field with matching Lux/D, the range of non-Gaussian region almost unchanged with a smaller Lux/D, while the non-Gaussian features become more evident, leading to higher values of Sk, Ku and peak factor. On contrary, the values of fluctuating pressures become lower in the wind field with a smaller Lux/D, eventually resulting in underestimation of extreme wind loads. Hence, the matching relationship of turbulence integral scale to depth should be carefully considered as estimating the extreme wind loads of long-span roof by wind tunnel tests.

Crystal Structure and Low Temperature Magnetic Properties of Melt-Spun $Sm_{2}Co_{7}B_{3}$ Compound (급냉응고된 $Sm_{2}Co_{3}B_{7}$ 화합물의 결정구조와 저온 자기특성)

  • Yang, C.J.;Lee, W.Y.;Choi, S.D.
    • Journal of the Korean Magnetics Society
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    • v.3 no.4
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    • pp.284-288
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    • 1993
  • Low temperature magnetic properties and crystal structures of melt-spun $Sm_{2}Co_{7}B_{3}$ compound were characterized. The magnetic measurements in the temperature range 77 K~450 K indicated that a spin-reorientation took place at about 150~160 K. A large anisotropy was observed(Ha=135 kOe at 300 K, 725 kOe at 77 K) for $Sm_{2}Co_{7}B_{3}$ although the magnetic moment is rather low. The crystal structure of the $Sm_{2}Co_{7}B_{3}$ compound was analyzed in detail by Rietveld analysis of powder diffraction pattern, and it was revealed that B(4h) atoms are not placed in the Sm(2e) layer but in between the Sm(2e) and Co($6i_{1}$) layers.

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