• Title/Summary/Keyword: a two-layer structure

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Two-Layer Video Coding Using Pyramid Structure for ATM Networks (ATM 망에서 피라미드 구조를 이용한 2계층 영상부호화)

  • 홍승훈;김인권;박래홍
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1995.06a
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    • pp.97-100
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    • 1995
  • In transmission of image sequences over ATM networks, the packet loss problem and channel sharing efficiency are important. As a possible solution two-layer video coding methods have been proposed. These methods transmit video information over the network with different levels of protection with respect to packets loss. In this paper, a two-layer coding method using pyramid structure is proposed and several realizations of two-layer video coding methods are presented and their performances are compared.

A Study on the Outside Waterproof Method of Ground using Wire-mesh and Non-hardening Viscosity WaterproofBusiness (비경화성 점착 방수제와 보강메쉬를 이용한 지하 외방수 공법에 관한 연구)

  • Moon, You-Seok;Lee, Sin-Chun;Gwon, Gi-Ju;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2009.05b
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    • pp.213-217
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    • 2009
  • Underground structures are built into concrete like a architecture and public works. Concrete has watertightness as such, But buildings are leaking from the cracks. Recently, construction method do a lot of close construction in the downtown area. So architects are using the method for the outer layer of a two-layer wall to save spaces. They have been using Top-down method and waterproof agent method and others to outer layer of a two-layer wall method. But, There are many leakage in underground structure from lack on requirements performance of materials. Therefore, I hope to test the outside Waterproof Method of Ground using Wire-mesh and Non-hardening Viscosity Waterproof. In addition to, I wish to apply as outside waterproof method for the section for the outer layer of a two-layer wall in underground structure.

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Design of a Bandpass Filter using Two Layer Microstrip Structure (두 층 마이크로스트립 구조를 이용한 대역통과 여파기 설계)

  • 천동완;박정훈;신철재
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.40 no.3
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    • pp.18-24
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    • 2003
  • The resonator using two layer microstrip structure was proposed and the bandpass filter was designed using this resonator in this paper. The proposed resonator structure is constructed by placing a U-shape of resonator in the first layer and then placing a broadside coupling strip in the second layer just above of the U-shape of resonator's edge part. Because these structure has various design parameters than general single layer coupled line structure, filter design is more flexible. In this paper, the narrow band filter was designed using multi-layer structure that had been applied to broadband filter because it's high coupling nature. The filter was designed to have 4MHz center frequency and 3 % fractional bandwidth, and finally confirmed that can be realizable narrow band filter by using multi-layer structure through fabrication and measurement.

A two-layer watermarking method using inherent image structure (영상의 내재 구조를 이용한 2-계층 워터마킹 기법)

  • 고윤호;김성대;최재각
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.41 no.3
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    • pp.59-72
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    • 2004
  • In this paper, we classify various attacks that may damage the embedded watermark signal into waveform attack and synchronization attack. And for the specialized defense against the two kinds of attacks we propose a new watermarking scheme named as two layer watermarking method. It consists of a synchronization layer to prepare for the geometrical attack such as rotation and shift and a marking layer 0 embed the watermark signal actually. Namely, the synchronization layer only determines the target region where the watermark signal will be embedded or extracted. And the marking layer spreads the watermark signal over the image as the conventional watermarking methods do. Using the layered structure, the proposed method overcomes the problem that the conventional watermarking methods that do not use the original image at the verification side are most vulnerable to geometrical attacks.

A Study on Vibration Control of Multi-layer Structure(I) (다층 층상 구조물의 진동제어에 관한 연구 (I))

  • Jeong, Hae-Jong;Byeon, Jeong-Hwan;Yang, Ju-Ho
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.33 no.2
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    • pp.141-148
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    • 1997
  • This paper is concerned with the vibration control of multi-layer structure for ultra-tall buildings and main tower of large bridge etc. We have modeled the multi-layer structure with the distributed mass system as the lumped mass system of two-degree-of-freedom structure and made experimental equipment. The LQ optimal control theory is applied to the design of the control system. The designed control system is simulated by computer. As a result, the LQ regulator showed good vibration control performance with impact excitation.

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A Study on Vibration Control of Multi-layer Structure by $H_\infty$Control ($H_\infty$제어기법에 의한 다층 층상 구조물의 진동제어에 관한 연구)

  • 정해종;김창화;변정환;양주호
    • Journal of KSNVE
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    • v.7 no.5
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    • pp.803-810
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    • 1997
  • This paper is concerned with the vibration control of multi-layer structure for ultra-tall buildings and main tower of large bridge etc. We have modeled the multi-layer structure with the distributed mass system as the lumped mass system of two-degree-of-freedom structure and made experimental equipment. The $H_\infty$control theory was applied to the design of the control system. The designed control system was simulated by computer. As a result, the designed $H_\infty$controller showed the good vibration control performance to impulse response and frequency response.

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Study on the Water-Vapor Permeation through the Al Layer on Polymer Substrate (폴리머 기판에 형성한 알루미늄 보호막의 수분침투 특성 연구)

  • Choi, Young-Jun;Ha, Sang-Hoon;Park, Ki-Jung;Choe, Youngsun;Cho, Young-Rae
    • Korean Journal of Metals and Materials
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    • v.47 no.12
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    • pp.873-880
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    • 2009
  • Water-vapor permeation through metallic barriers deposited on polymer substrates has been an important technological issue because the performance of the barrier is critical to the reliability of flexible organic devices. For the development of long-lifetime flexible organic devices, two different sets of samples were designed and demonstrated from the viewpoint of the water-vapor transmission rate (WVTR). Aluminum (Al) and polyethylene terephthalate (PET) were chosen for the barrier layer and the polymer substrate, respectively. Two stacking structures, a single-layer (Al/PET) structure and a double-layer (Al/PET/Al) structure, were used for the WVTR measurement. For the single-layer structure, the WVTR decreases as the thickness of the barrier layer increases. Compared to the single-layer sample, the double-layer sample showed superior WVTR performance (by nearly three times) when the total thickness of the Al barrier was greater than 100 nm.

Hole Mobility Characteristics of Biaxially Strained SiGe/Si Channel Structure with High Ge Content (고농도의 Ge 함량을 가진 Biaxially Strained SiGe/Si Channel Structure의 정공 이동도 특성)

  • Jung, Jong-Wan
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.1
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    • pp.44-48
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    • 2008
  • Hole mobility characteristics of two representative biaxially strained SiGe/Si structures with high Ge contents are studied, They are single channel ($Si/Si_{1-x}Ge_x/Si$ substrate) and dual channel ($Si/Si_{1-y}Ge_y/Si_{1-x}Ge_x/Si$ substrate), where the former consists of a relaxed SiGe buffer layer with 60 % Ge content and a tensile-strained Si layer on top, and for the latter, a compressively strained SiGe layer is inserted between two layers, Owing to the hole mobility performance between a relaxed SiGe film and a compressive-strained SiGe film in the single channel and the dual channel, the hole mobility behaviors of two structures with respect to the Si cap layer thickness shows the opposite trend, Hole mobility increases with thicker Si cap layer for single channel structure, whereas it decreases with thicker Si cap layer for dual channel. This hole mobility characteristics could be easily explained by a simple capacitance model.

Multimodal Medical Image Fusion Based on Double-Layer Decomposer and Fine Structure Preservation Model (복층 분해기와 상세구조 보존모델에 기반한 다중모드 의료영상 융합)

  • Zhang, Yingmei;Lee, Hyo Jong
    • KIPS Transactions on Computer and Communication Systems
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    • v.11 no.6
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    • pp.185-192
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    • 2022
  • Multimodal medical image fusion (MMIF) fuses two images containing different structural details generated in two different modes into a comprehensive image with saturated information, which can help doctors improve the accuracy of observation and treatment of patients' diseases. Therefore, a method based on double-layer decomposer and fine structure preservation model is proposed. Firstly, a double-layer decomposer is applied to decompose the source images into the energy layers and structure layers, which can preserve details well. Secondly, The structure layer is processed by combining the structure tensor operator (STO) and max-abs. As for the energy layers, a fine structure preservation model is proposed to guide the fusion, further improving the image quality. Finally, the fused image can be achieved by performing an addition operation between the two sub-fused images formed through the fusion rules. Experiments manifest that our method has excellent performance compared with several typical fusion methods.

First-Principles Study on the Electronic Structure of Bulk and Single-Layer Boehmite

  • Son, Seungwook;Kim, Dongwook;Na-Phattalung, Sutassana;Ihm, Jisoon
    • Nano
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    • v.13 no.12
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    • pp.1850138.1-1850138.6
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    • 2018
  • Two-dimensional (2D) or layered materials have a great potential for applications in energy storage, catalysis, optoelectronics and gas separation. Fabricating novel 2D or quasi-2D layered materials composed of relatively abundant and inexpensive atomic species is an important issue for practical usage in industry. Here, we suggest the layer-structured AlOOH (Boehmite) as a promising candidate for such applications. Boehmite is a well-known layer-structured material and a single-layer can be exfoliated from the bulk boehmite by breaking the interlayer hydrogen bonding. We study atomic and electronic band structures of both bulk and single-layer boehmite, and also obtain the single-layer exfoliation energy using first-principles calculations.