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Ultra-Low Resolution Thermal Imaging Sensors
Justin A. T. Halls 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.2
It is widely recognized that there is a growing need for the use of technology to enable elderly people to go on living in their own homes for as long as possible. If such systems are to be deployed on a large scale it is important that both equipment and installation costs should be kept as low as possible. This paper describes the use of a very low cost 8 pixel infra-red sensor array in two very distinct applications. In the first it is used as a generic person detector, which can not only identify which room a person is in, but can provide information about where in the room they are located. The second application is for detecting thermal hazards in the kitchen, and especially identifying if cooking has been left unattended - a major cause of domestic fires. It is apparent that a simple sensor such as this is capable of providing a wide range of useful information in a smart or caring home.
Mustard, Thomas Jeffrey Lomax,Kwak, Hyunwook Shaun,Goldberg, Alexander,Gavartin, Jacob,Morisato, Tsuguo,Yoshidome, Daisuke,Halls, Mathew David The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.3
Continued miniaturization and increasingly exact requirements for thin film deposition in the semiconductor industry is driving the search for new effective, efficient, selective precursors and processes. The requirements of defect-free, conformal films, and precise thickness control have focused attention on atomic layer deposition (ALD). ALD precursors so far have been developed through a trial-and-error experimental approach, leveraging the expertise and tribal knowledge of individual research groups. Precursors can show significant variation in performance, depending on specific choice of co-reactant, deposition stage, and processing conditions. The chemical design space for reactive thin film precursors is enormous and there is urgent need for the development of computational approaches to help identify new ligand-metal architectures and functional co-reactants that deliver the required surface activity for next-generation thin-film deposition processes. In this paper we discuss quantum mechanical simulation (e.g. density functional theory, DFT) applied to ALD precursor reactivity and state-of-the-art automated screening approaches to assist experimental efforts leading toward optimized precursors for next-generation ALD processes.
濟州島 人工草地 植生의 經時的 變化에 관한 硏究 : 草種의 李節 및 年次的 變化 The Seasonal and Annual Changes in Species
金翰琳,趙南棋,宋昌吉 제주대학교 1981 논문집 Vol.13 No.-
本 硏究는 濟州道 改良牧草地에 있어서 草種組成의 季節 및 年次的 變動狀態를 調査한 結果이며 그 槪要는 다음과 같다. 1. 改良年度別 草種의 變動狀態는 1975年 草地에서 37種이었으나 年數가 經過함에 따라 種數가 增加되어 1980年 草地에서는 130種이었으며 每年 季節에 따르는 種의 數는 夏期에 가장 많았고 春期에는 種의 分布가 가장 적었다. 2. 改良年度別 生育型의 分布變動狀態는 1975年 草地에서 一年生 12種, 多年生 25種, 木本 1種이었으나,年數가 지남에 따라 每年 增加되어 1980年 草地에서는 一年生 42種, 多年生 88種, 木本 5種이었으며, 每年 季節에 따르는 生育型에 있어서는 一年生은 秋期에서, 多年生은 夏期에서 가장 많은 種이 分布되었고 木本雜草는 季節에 變化가 없었다. This study was conducted to investigate the seasonal and annual changes in species on the impoved pastures in Cheju Island. The results are as follows : 1. The annual changes in the number of intruding weed species were obsered. 33 weed species were found in 1975 and increased year after year to 127 species in 1980. The seasonal changes of species by year were also observed. In summer more species ranged than in any other seasons and the number of species growing in spring was found fewer than in other seasons. 2. The distributional changes in annual and perenial plant were brough on. 10 species of annual plant, 23 species of perennial plant, and one species of arbor were found in 1975 and increased respectively year by year to 44 species (annual plant), 86 species(perennial plant) and 5 species (arbor) in 1980. The seasonal changes in ecology by year showed a tendency that more species of annual plant ranged in autumn, and more perennial plants in summer than in any other season. But there is no change in the species of arbor.
Thermal Insulation of Protective Clothing Materials in Extreme Cold Conditions
Zemzem Mohamed,Hallé Stéphane,Vinches Ludwig 한국산업안전보건공단 산업안전보건연구원 2023 Safety and health at work Vol.14 No.1
Background: Thermophysiological comfort in a cold environment is mainly ensured by clothing. However, the thermal performance and protective abilities of textile fabrics may be sensitive to extreme environmental conditions. This article evaluated the thermal insulation properties of three technical textile assemblies and determined the influence of environmental parameters (temperature, humidity, and wind speed) on their insulation capacity. Methods: Thermal insulation capacity and air permeability of the assemblies were determined experimentally. A sweating-guarded hotplate apparatus, commonly called the “skinmodel,” based on International Organization for Standardization (ISO) 11092 standard and simulating the heat transfer from the body surface to the environment through clothing material, was adopted for the thermal resistance measurements. Results: It was found that the assemblies lost about 85% of their thermal insulation with increasing wind speed from 0 to 16 km/h. Under certain conditions, values approaching 1 clo have been measured. On the other hand, the results showed that temperature variation in the range (40C, 30C), as well as humidity ratio changes (5 g/kg, 20 g/kg), had a limited influence on the thermal insulation of the studied assemblies. Conclusion: The present study showed that the most important variable impacting the thermal performance and protective abilities of textile fabrics is the wind speed, a parameter not taken into account by ISO 11092.
Hall, Ryan,Desai, Priyanka S.,Kang, Beom-Goo,Huang, Qifan,Lee, Sanghoon,Chang, Taihyun,Venerus, David C.,Mays, Jimmy,Ntetsikas, Konstantinos,Polymeropoulos, George,Hadjichristidis, Nikos,Larson, Ronal American Chemical Society 2019 Macromolecules Vol.52 No.20
<P>We blend newly synthesized nearly monodisperse four-arm star 1,4-polybutadienes with various well-entangled linear polymers, confirming the conclusions in Desai et al. [<I>Macromolecules</I>201649 (13)49644977] that advanced tube models, namely, the hierarchical 3.0 and branch-on-branch models [Wang, Z.; <I>J. Rheol.</I>201054 (2)223260], fail to predict the linear rheological data when the pure linear polymers have shorter relaxation times, but within 3-4 orders of magnitude of the star polymer. However, when the linear polymer has a longer relaxation time than the star, our new work, surprisingly, finds that non-monotonic dependence of terminal relaxation behavior on composition is both observed experimentally and captured by the models. Combined with previous data from the literature, we present results from over 50 1,4-polybutadiene star-linear blends, suitable for thorough testing of rheological models of entangled polymers.</P> [FIG OMISSION]</BR>
SIGN PATTERNS OF IDEMPOTENT MATRICES
Hall, Frank J.,Li, Zhong-Shan Korean Mathematical Society 1999 대한수학회지 Vol.36 No.3
Sign patterns of idempotent matrices, especially symmetric idempotent matrices, are investigated. A number of fundamental results are given and various constructions are presented. The sign patterns of symmetric idempotent matrices through order 5 are determined. Some open questions are also given.
Hall, Ryan,Kang, Beom-Goo,Lee, Sanghoon,Chang, Taihyun,Venerus, David C.,Hadjichristidis, Nikos,Mays, Jimmy,Larson, Ronald G. American Chemical Society 2019 Macromolecules Vol.52 No.4
<P>We determine experimentally the “dilution exponent” α for entangled polymers from the scaling of terminal crossover frequency with entanglement density from the linear rheology of three 1,4-polybutadiene star polymers that are blended with low-molecular-weight, unentangled linear 1,4-polybutadiene at various star volume fractions, ϕ<SUB><I>s</I></SUB>. Assuming that the rheology of monodisperse stars depends solely on the plateau modulus <I>G</I><SUB><I>N</I></SUB>(ϕ<SUB>s</SUB>) ∝ ϕ<SUB><I>s</I></SUB><SUP>1+α</SUP>, the number of entanglements per chain <I>M</I><SUB><I>e</I></SUB>(ϕ<SUB><I>s</I></SUB>) ∝ ϕ<SUB><I>s</I></SUB><SUP>-α</SUP>, and the tube-segment frictional Rouse time τ<SUB><I>e</I></SUB>(ϕ<SUB><I>s</I></SUB>) ∝ ϕ<SUB><I>s</I></SUB><SUP>-2α</SUP>, we show that only an α = 1 scaling superposes the <I>M</I><SUB><I>e</I></SUB>(ϕ<SUB><I>s</I></SUB>) dependence of the terminal crossover frequency ω<SUB><I>x</I>,<I>t</I></SUB> of the blends with those of pure stars, not α = 4/3. This is the first determination of α for star polymers that does not rely on any particular tube model implementation. We also show that a generalized tube model, the “Hierarchical model”, using the “Das” parameter set with α = 1 reasonably predicts the rheological data of the melts and blends featured in this paper.</P> [FIG OMISSION]</BR>