• 펄프종이기술
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• 제38권2호
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• pp.35-42
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• 2006

This study was carried out to develop a new application field of traditional Hanji and obtain the basic data for producing functional Hanji using sawdust ceramics and rice-husk ceramics as an architectural material. The results measuring water vapor permeance and water vapor absorption for using window materials and wallpapers are as follows. Hanji wallpaper has good things in controlling indoor space comfortably. Particularly, ability of controlling humidity of Hanji wallpaper affects indoor space comfort and human health. In the case indoor humidity is higher than outdoor humidity, according to the addition of ceramics, Hanji wallpapers maintain the humidity by retaining water vapor molecules in the pores of ceramics. Thus the Hanji wallpapers with ceramics, in particular rice-husk ceramics, make it superior to non-ceramics Hanji wallpapers in maintaining the humidity indoors.

• The International Journal of Costume Culture
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• 제13권2호
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• pp.154-159
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• 2010

Various decorative patterns and sculptures found in antique architectures like palace architecture and temple architecture are not only valuable assets of our culture but have religious meaning at the same time and show aesthetic aspiration and desire of Korean people. In this study, potential application of patterns in textile industry is suggested based on the reconstructed and patternized geometric patterns of window grids, a decorative element in architecture, and stair and stair somaetdol, a architectural element in Buddhist temples, using Photoshop and Illustrator program of Adobe INC AND Tex-pro program of Youngwoo CNI INC. All around the world today, efforts to reinterpret unique and antique architectures and cultural assets in a modern way has been increasing. Decorative patterns displayed in Buddhist temple architectures which are antique Korean architectures have excellent geometric aesthetic value. And the development potential of patternizing these elements into modern designs is high. Therefore, it is thought to be possible to develop high value-added fabric and to develop various fashion items including apparel and interior decoration based on modern reinterpretation of patterns of window grid and decorative elements of stairs and stair somaetol that are part of our antique architectures.

• Water Engineering Research
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• 제6권2호
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• pp.63-71
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• 2005

Nowadays Climate disasters are frequently happening due to occasional occurrences of EI Nino and La Nina events and among them, water shortage is one of the serious problems. To cope with this problem, climate model simulations can give very helpful information. To utilize the climate model for enhancing the water resources planning techniques, probabilistic measures of the effectiveness of global climate model (GCM) simulations of an indicator variable for discriminating high versus low regional observations of a target variable are proposed in this study. The objective of this study is to present the various analysis methods to find the suitable application methods of GCM information for Korean water resources planning. The basic formulation uses the significance probability of the Kolmogorov-Smirnov test for detecting differences between two variables. The various methods for adopting correct association, changing the window size, discrimination condition, and the use of temporally down scaled data were proposed to find out the suitable way for Korean water resources planning.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1997년도 Proceedings International Workshop on New Video Media Technology
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• pp.131-136
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• 1997

We present a method to estimate a dense and sharp depth map using multiple cameras for the application to flexible video production. A key issue for obtaining sharp depth map is how to overcome the harmful influence of occlusion. Thus, we first propose to selectively use the depth information from multiple cameras. With a simple sort and discard technique, we resolve the occlusion problem considerably at a slight sacrifice of noise tolerance. However, boundary overreach of more textured area to less textured area at object boundaries still remains to be solved. We observed that the amount of boundary overreach is less than half the size of the matching window and, unlike usual stereo matching, the boundary overreach with the proposed occlusion-overcoming method shows very abrupt transition. Based on these observations, we propose a hierarchical estimation scheme that attempts to reduce boundary overreach such that edges of the depth map coincide with object boundaries on the one hand, and to reduce noisy estimates due to insufficient size of matching window on the other hand. We show the hierarchical method can produce a sharp depth map for a variety of images.

• International Journal of Naval Architecture and Ocean Engineering
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• 제7권2호
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• pp.301-314
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• 2015

Aiming at accurately distinguishing modeless component and natural vibration mode terms from data series of nonlinear and non-stationary processes, such as Vortex-Induced Vibration (VIV), a new empirical mode decomposition method has been developed in this paper. The key innovation related to this technique concerns the method to decompose modeless component from non-stationary process, characterized by a predetermined 'maximum intrinsic time window' and cubic spline. The introduction of conceptual modeless component eliminates the requirement of using spurious harmonics to represent nonlinear and non-stationary signals and then makes subsequent modal identification more accurate and meaningful. It neither slacks the vibration power of natural modes nor aggrandizes spurious energy of modeless component. The scale of the maximum intrinsic time window has been well designed, avoiding energy aliasing in data processing. Finally, it has been applied to analyze data series of vortex-induced vibration processes. Taking advantage of this newly introduced empirical decomposition method and mode identification technique, the vibration analysis about vortex-induced vibration becomes more meaningful.

• 한국통신학회논문지
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• 제25권3B호
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• pp.487-492
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• 2000

ABR (Available Bit Rate) 서비스는 ATM (Asynchronous Transfer Mode) 에서 데이터 응용을 지원하기 위하여 개발되었으며, TCP(Transmission Control Protocol) 는 현재 사용되는 데이터망에서 가장 널리 이용되는 트랜 스포트 계층 프로토콜이다. 따라서 TCP over ABR의 성능 향상은 대단히 중요한 문제이다. 본 논문에서는 RM (Resource Management)셀의 정보를 이용한 TCP congestion 윈도우 크기 조절을 제안한다. 제안된 방식의 사용으로 TCP 윈도우 크기 결정에 보다 신뢰성 있는 망 정보 (RM 셀 내의 ER 값)를 사용하게 된다. 시뮬레이션은 다양한 망 상황과 다양한 망 구성에서 행하여졌으며 시뮬레이션 결과는 제안된 방식의 시용으로 TCP의 성능이 월등히 향상됨을 보인다.

• Journal of Electrochemical Science and Technology
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• 제12권4호
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• pp.387-397
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• 2021

Deep eutectic solvents have been established as feasible metal electroplating solvent alternatives over traditional toxic aqueous plating baths. However, water, either added intentionally or unintentionally, can significantly influence the solvent's physical properties and performance, thereby hindering its industry application. In this study, the hygroscopicity, or the ability to absorb moisture from the environment, of synthesized ethaline (1:2 choline chloride:ethylene glycol) was investigated. The kinematic viscosity, electrical conductivity, electrochemical window, and water content of ethaline were monitored over a 2-week period. Karl Fischer titration tests showed that ethaline exposed to the atmosphere displayed significant hygroscopicity compared to its unexposed counterpart. ¹H NMR spectroscopy revealed that water vapor was readily absorbed at the surface due to the hydrophilic groups present in the ethaline molecule. Water uptake resulted in the decrease in viscosity, increase in electrical conductivity and narrowing of the electrochemical window of ethaline. Solution heating at 100℃ removed the absorbed moisture and allowed the recovery of the solvent's initial properties.

• 한국전기전자재료학회논문지
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• 제28권12호
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• pp.808-812
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• 2015

Highly optical transparent photoelectric devices were realized by using a transparent metal-oxide semiconductor heterojunction of p-type NiO and n-type ZnO. A functional template of ITO nanowires (NWs) was applied to this transparent heterojunction device to enlarge the light-reactive surface. The ITO NWs/n-ZnO/p-NiO heterojunction device provided a significant high rectification ratio of 275 with a considerably low reverse saturation current of 0.2 nA. The optical transparency was about 80% for visible wavelengths, however showed an excellent blocking UV light. The nanostructured transparent heterojunction devices were applied for UV photodetectors to show ultra fast photoresponses with a rise time of 8.3 mS and a fall time of 20 ms, respectively. We suggest this transparent and super-performing UV responser can practically applied in transparent electronics and smart window applications.

• 한국전기전자재료학회논문지
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• 제29권6호
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• pp.359-364
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• 2016

NiO serves as a window layer for Si photoelectric devices. Due to the wide energy bandgap of NiO, high optical transparency (over 80%) was achieved and applied for Si photoelectric devices. Due to the high the high mobility, the heterojunction device (Al/n-Si/$SiO_2$/p-NiO/ITO) provide ultimately fast photoresponses of rising time of $38.33{\mu}s$ and falling time of $39.25{\mu}s$, respectively. This functional NiO layer would provide benefits for high-performing photoelectric devices, including photodetectors and solar cells.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 A
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• pp.211-214
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• 2003

현재 VOD 의 구현 방식은 PC기반을 이용하여 구현되고 있는데 이 VOD를 PC기반이 아닌 Embedded System으로 구현하는 연구를 수행하였다. 이 시스템의 OS는 WindowsCE.net을 이용하였으며, x86코어를 내장한 Sc1200(National사의 Geode제품군)을 CPU로 사용하였고, 메모리는 128 MByte SDRAM을 사용하였다. 그 외에 영상 데이터의 처리를 위하여 Mpeg Decoder를 사용하였고, Internet 망을 이용하기 위한 Ethernet Controller를 이용하였다. 그리고 소프트웨어를 저장하기 위한 저장메모리가 3가지 가 있는데, BIOS를 위한 Boot ROM과 WindowsCE Kernel을 저장하고 있는 Flash Memory, 그리고 나머지 기타 환경을 저장하기위한 Disk On Chip이 3가지가 저장메모리이다. 이 시스템의 영상출력부는 컴포지트(Composite), 컴포넌트(Com ponent), S-Video가 있으며 이들 중 1가지를 선택하여 TV에 연결하여 동작 되도록 하였다. 실제 구현은 시스템 개발에 필요한 BIOS, WinodwsCE.net Porting, DeviceDriver와 동작 확인에 필요한 간단한 Application 제작하였으며, 영상 Play는 WindowsCE.net에 포함되어있는 Window Media Player를 이용하였다. 따라서, 본 논문은 현재 PC에서 구현되고 있는 VOD 서비스의 단점들인 불필요한 마우스와 키보드 조작, PC와 TV의 연결 시 해상도 호환 문제등 을 보완하고자 Embedded System의 형태로 바꾸어 손쉽게 TV와 연결하여 사용할 수 있도록 구현하는데 의의가 있다고 할 수 있다.