• Title/Summary/Keyword: Blue Room

Search Result 179, Processing Time 0.035 seconds

A Study on the High Temperature Tensile Property and the Characteristics of Residual Stress in Welds of High Strength Steels (고강도강재의 고온인장특성 및 용접시 잔류응력특징에 관한 연구)

  • 장경호;이진형;신영의
    • Journal of Welding and Joining
    • /
    • v.22 no.4
    • /
    • pp.50-58
    • /
    • 2004
  • In this study, high temperature tensile properties of high strength steels(POSTEN60, POSTEN80) were investigated. The three-dimensional thermal elastic-plastic analyses were conducted to investigate the characteristics of welding residual stresses in welds of high strength steels on the basis of thermal and mechanical properites at high temperature obtained from the experiment. According to the results, high temperature tensile strength of POSTEN60 steel deteriorated slowly to 10$0^{\circ}C$. As the temperature went up, the tensile strength became better because of blue shortness, and it deteriorated radically after reaching to the maximum value around 30$0^{\circ}C$. For the POSTEN80 steel, high temperature tensile strength deteriorated slowly to 20$0^{\circ}C$. As the temperature went up the tensile strength became better and it deteriorated slowly to $600^{\circ}C$ after reached to the maximum value around 30$0^{\circ}C$. Strain of high strength steels at the elevated temperature increased radically after the mercury rose to $600^{\circ}C$. The strain hardening ratio of POSTEN60 steel was larger then that of POSTEN80 steel at the elevated temperature as in the case at the room temperature and it became smaller radically after the mercury rose to 40$0^{\circ}C$. And, in the welding of high strength steels, increasing tensile strength of the steel (POSTEN60

Registration of Video Avatar by Comparing Real and Synthetic Images (실제와 합성영상의 비교에 의한 비디오 아바타의 정합)

  • Park Moon-Ho;Ko Hee-Dong;Byun Hye-Ran
    • Journal of KIISE:Computer Systems and Theory
    • /
    • v.33 no.8
    • /
    • pp.477-485
    • /
    • 2006
  • In this paper, video avatar, made from live video streams captured from a real participant, was used to represent a virtual participant. By using video avatar to represent participants, the sense of reality for participants can be increased, but the correct registration is also an important issue. We configured the real and virtual cameras to have the same characteristics in order to register the video avatar. Comparing real and synthetic images, which is possible because of the similarities between real and virtual cameras, resolved registration between video avatar captured from real environment and virtual environment. The degree of incorrect registration was represented as energy, and the energy was then minimized to produce seamless registration. Experimental results show the proposed method can be used effectively for registration of video avatar.

Development of a Time-temperature Indicator for Managing the Distribution Temperature of Frozen Mackerel Scomber japonicus (냉동 고등어(Scomber japonicus)의 유통 온도 관리를 위한 Time-temperature Indicator 개발)

  • Choi, Jeong-Wook;Lee, Min-Kyeong;Choi, Jae-Hyuk;Jang, Myung-Kee;Ahn, Dong-Hyun;Nam, Taek-Jeong
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.51 no.5
    • /
    • pp.590-594
    • /
    • 2018
  • We developed a time-temperature indicator (TTI) that rapidly determines whether frozen mackerel Scomber japonicus has thawed during its distribution. Our TTI was made from filter paper capable of absorbing mackerel exudate that was soaked in a 20% citric acid solution at pH 4.0 and then dried. The dried absorbent paper was cut and attached to blue litmus paper with a 2 mm overhang. The fixed litmus paper was covered with a polypropylene film and sealed. The indicator was placed inside a polyvinyl vacuum package containing the mackerel sample. The vacuum-sealed packaged was frozen at $-20^{\circ}C$ for 24 h. After freezing, the color change and time dependence of the indicator were observed at room temperature ($25^{\circ}C$) and demonstrated the utility of this TTI for rapidly determining whether frozen mackerel underwent thawing during distribution.

One-Pot Synthesis, Crystal Structures and Thermal Properties of Two Three-Dimensional Cobalt(II) Complexes

  • Tao, Bo;Lei, Wen;Cheng, Feiran;Xia, Hua
    • Bulletin of the Korean Chemical Society
    • /
    • v.33 no.6
    • /
    • pp.1929-1933
    • /
    • 2012
  • Two cobalt(II) compounds $[Co(2,2{^\prime}-bipy)(H_2O)_2(SO_4)]_n$ (1) and $[Co_2(2,2^{\prime}-bipy)_2(btec)(H_2O)_6]{\cdot}2H_2O$ (2) (2,2'-bipy = 2,2'-bipyridine, $H_4btec$ = 1,2,4,5-benzenetetracarboxylic acid), have been simultaneously synthesized by a one-pot slow solvent evaporation reaction. Their structures were determined by single-crystal X-ray diffraction and further characterized by X-ray powder diffraction (XRPD), IR, elemental and thermogravimetric analysis (TGA). The structural analysis reveals that compound 1 exhibits an infinite 1D chain structure with the octahedral Co(II) centers bridging by the tetrahedral ${\mu}_2-SO{_4}^{2-}$ ligands, while compound 2 possesses a dinuclear $Co_2(2,2^{\prime}-bipy)_2(btec)(H_2O)_6$ unit and the two adjacent octahedral Co(II) ions are linked by the bismonodentately coordinated btec ligand. Additionally, compound 2 exhibits blue fluorescent emission in the solid state at room temperature.

The preferred orientation and morphology characteristics of AlN thin films prepared by RF power under Room Temperature process (저온공정을 이용한 AlN 박막의 우선배향성과 모폴로지에 관한 연구)

  • Oh, Su-Young;Lee, Tae-Yong;Kim, Eung-Kwon;Kang, Hyun-Il;Song, Joon-Tae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2007.11a
    • /
    • pp.313-314
    • /
    • 2007
  • AlN is used a wide variety of applications such as electroacoustic devices, blue diode and metal-insulator-semiconductor structures. AlN thin films were deposited on Si substrates by rf sputter technique with low temperature process. The orientation and morphology of AlN thin films at various power in the range from 150 to 300 w was studied. X-ray diffraction (XRD), full width at half-maximum (FWHM) and field emission scanning electron microscopy were employed to characterize the deposited films. The c-axis orientation along (002) Plane at experimental results was enhanced with the increasing of the rf power from 150 to 300 w and the surface morphology of the films showed a homogeneous and nano-sized microstructure.

  • PDF

The structure and optical properties of n-type and p-type porous silicon (n-type과 p-type 다공성 실리콘의 구조와 광학적 특성에 관한 연구)

  • 박현아;오재희;박동화;안화승;태원필;이종무
    • Journal of the Korean Vacuum Society
    • /
    • v.12 no.4
    • /
    • pp.257-262
    • /
    • 2003
  • The structure and optical properties of n-type and p-type porous silicon (PS) prepared by the chemical etching in the light and the dark, respectively, are reported in this paper. Microstructural features of the samples are mainly investigated by SEM, AFM XRDGI techniques. Also, their optical properties are investigated by photoluminescence (PL) and Fourier transform infrared absorption measurements. In the n-type PS, the room temperature photoluminescence is observed in a visible range from 500 nm to 650 nm in contrast to that in the blue region (400∼650 nm) in p-type PS. Further, semi-transparent Cu films in thickness range of ∼40 nm are deposited by rf-magnetron sputtering on PS to investigate the I-V characteristics of the samples.

Thermally assisted IRSL and VSL measurements of display glass from mobile phones for retrospective dosimetry

  • Discher, Michael;Kim, Hyoungtaek;Lee, Jungil
    • Nuclear Engineering and Technology
    • /
    • v.54 no.2
    • /
    • pp.429-436
    • /
    • 2022
  • Investigations of retrospective dosimetry have shown that components of mobile phones are suitable as emergency dosimeters in case of radiological incidents. For physical dosimetry, components can be read out using optically stimulated luminescence (OSL), thermoluminescence (TL) and phototransferred thermoluminescence (PTTL) methods to determine the absorbed dose. This paper deals with a feasibility study of display glass from modern mobile phones that are measured by thermally assisted (Ta) optically stimulated luminescence. Violet (VSL, 405 nm) and infrared (IRSL, 850 nm) LEDs were used for optical stimulation and two protocols (Ta-VSL and Ta-IRSL) were tested. The aim was to systematically investigate the luminescence properties, compare the results to blue stimulated Ta-BSL protocol (458 nm) and to develop a robust measurement protocol for the usage as an emergency dosimeter after an incident with ionizing radiation. First, the native signals were measured to calculate the zero dose signal. Next, the reproducibility and dose response of the luminescence signals were analyzed. Finally, the signal stability was tested after the storage of irradiated samples at room temperature. In general, the developed Ta-IRSL and Ta-VSL protocols indicate usability, however, further research is needed to test the potential of a new protocol for physical retrospective dosimetry.

Biological Control of Garlic Blue Mold using Pantoea agglomerans S59-4 (Pantoea agglomerans S59-4를 이용한 마늘 푸른곰팡이병의 생물학적 방제)

  • Kim, Yong-Ki;Hong, Sung-Jun;Jee, Hyung-Jin;Park, Jong-Ho;Han, Eun-Jung;Park, Kyung-Seok;Lee, Sang-Yeob;Lee, Seong-Don
    • The Korean Journal of Pesticide Science
    • /
    • v.14 no.2
    • /
    • pp.148-156
    • /
    • 2010
  • S59-4 isolate was evaluated as a potential biocontrol agent using in vivo wounded garlic bulb assay. When the spore suspension ($10^5$ spores/$m\ell$) of Penicillium hirsutum was co-inoculated with cell suspension of S59-4 isolate on wounded garlics, the isolate showed high suppressive effect to disease development. The isolate was identified as Pantoea agglomerans S59-4(Pa59-4) through Biolog system. Furthermore, soaking garlic bulbs in the suspension of Pa59-4 significantly reduced garlic decay caused by P. hirsutum. The optimal concentration of Pa59-4 for controlling garlic blue mold was $10^7\sim10^8$ cfu/$m\ell$. And suppressive effect of Pa59-4 on garlic storage decay reduced as inoculation concentration of Penicillium hirsutum increased. In addition in order to investigate population dynamics of Pa59-4 on application site of garlic cloves, two antibiotic markers, pimaricin and vancomycin were selected. Bacterial density of Pa59-4 on the wounded garlic cloves increased continuously both under room temperature condition and low temperature condition until 30days after application of Pa59-4, meanwhile that of Pa59-4 on intact garlic cloves increased until 15days after application of Pa59-4 and thereafter decreased continuously. Two culture media for mass-production of Pa59-4, LB medium and TSB medium, were selected. By-product of bio-fungicide formulated by mixing white carbon and bacterial suspension of Pa59-4 suppressed by 40 to 50% garlic blue mold. Above results suggest that Pa59-4 be a promising control agent against garlic blue mold.

Growth Characteristics of Lettuce under Different Frequency of Pulse Lighting and RGB Ratio of LEDs (LED의 간헐조명과 RGB 비율에 따른 상추의 품종별 생육 특성)

  • Kim, Sungjin;Bok, Gwonjeong;Lee, Gongin;Park, Jongseok
    • Journal of Bio-Environment Control
    • /
    • v.26 no.2
    • /
    • pp.123-132
    • /
    • 2017
  • This study was aimed to investigate the effect of 1)irradiation with several different ratios using red, green, and blue LEDs and 2)various pulsed light irradiation with 50% duty ratio using red and blue LEDs on the growth and morphogenesis of three lettuce cultivars (Lactuca sativar L. cv. 'Jukchukmeon', 'Lolo Rosa', and 'Grand Rapid') in hydroponics culture system for 4 weeks after transplanting. Seeds were sown in rock-wool plug trays and they were placed in a culture room which was controlled at $23{\pm}1^{\circ}C/18{\pm}1^{\circ}C$ temperature and 50-60/70-85% for day and night, respectively, during cultivation period. Irradiated RGB ratios with LEDs were 6:3:1, 5:2.5:2.5, 3:3:4, 2:2:6, and 1:1:8 with $110{\pm}3{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD on the surface of cultivation bed. The frequencies of pulsed lighting was 50, 100, 500, 1,000, 5,000, 10,000, 25,000Hz (20, 10, 0.1, 0.04 ms) with red and blue LEDs and 50% duty ratio. At the RGB ratio of 6:3:1, the average fresh weight of 'Jukchukmeon' was significantly higher than that of other RGB treatments, but no significant difference compared to the fluorescent treatment. The average fresh weight at 1:1:8 RGB ratio in 'Lolo Rosa' was significantly lower than that of other RGB treatments. Leaf number and fresh weight of 'Grand Rapid' were significantly lower in the control and 1:1:8 RGB treatments, compared to the other RGB treatments. As the ratio of blue light increased, leaf length decreased and leaf shape became round in three lettuces. Although there is little change in growth, it could not be found any tendency to affect the growth and morphogenesis of three lettuces caused by increasing or decreasing frequency of pulsed lighting with 50% duty ratio at the $72{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD.

Effects of LED Light Conditions on Growth and Analysis of Functional Components in Buckwheat Sprout (LED 광 조건에 따른 메밀 새싹의 생육 및 기능성 물질 분석)

  • Jeon, A-Young;Kim, Ki-Hyun;Kwon, Soo-Jeong;Roy, Swapan Kumar;Cho, Seong-Woo;Woo, Sun-Hee
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.60 no.3
    • /
    • pp.388-393
    • /
    • 2015
  • Buckwheat sprouts are a vegetable; a functional food should provide health benefit and enhance performance as high nutritionally important substances. Buckwheat noodles are the major buckwheat food in Japan, Korea and China. In addition, Buckwheat as preventive medicine has undergone a great advancement in the last decade. Comparison of the functional properties distribution and utilization in tatary buckwheat is required of understanding the metabolites. The study was conducted to identify the sorts of phenolic compounds and metabolites in tatary buckwheat seedling at 4, 7, and 10 days seedling under the different combinations of light-emitting diode (LED) such as blue, red, mix (red, blue, and white), dark, and natural lights in stem and leaves. After breaking the dormancy, buckwheat seeds were grown in culture room under lights for 14 hrs and the dark condition for 10 hrs, at $25^{\circ}C$ for 10 days. Length of buckwheat was gradually increased under all of the conditions. Using HPLC, rutin was highest at 7 days under mix and natural light in stem and leaf, respectively. Quercetin was highest at 4 and 7 days under natural light in both. Chlorogenic acid was highest at 7 days under mix and natural in stem and leaf, respectively. Taken Together, this study indicates that phenolic compounds and metabolites present in those plants could be helpful for the human health and nutritional additive.