• Title/Summary/Keyword: 무성아

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A Study of LCD Panel Cleaning Effect of Plasma Generation Power Source (플라즈마 발생용 전원장치의 LCD 패널 세정효과에 관한 연구)

  • Kim, Gyu-Sik
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.45 no.5
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    • pp.44-51
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    • 2008
  • UV lamp systems have been used for cleaning of display panels of TFT LCD or Plasma Display Panel (PDP). However, the needs for high efficient cleaning and low cost made high voltage plasma cleaning techniques to be developed and to be improved. Dielectric-Barrier Discharges (DBDs), also referred to as barrier discharges or silent discharges have been exclusively related to ozone generation for a long time. In this paper, a 6kW high voltage plasma power supply system was developed for LCD cleaning. The 3-phase input voltage is rectified and then inverter system is used to make a high frequency pulse train, which is rectified after passing through a high-power transformer. Finally, hi-directional high voltage pulse switching circuits are used to generate the high voltage plasma. Some experimental results showed the usefulness of atmospheric plasma for LCD panel cleaning.

Chlorella as a Functional Biomaterial (기능성 생물 소재로서의 클로렐라)

  • 채희정;강민숙;심상준
    • KSBB Journal
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    • v.19 no.1
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    • pp.1-11
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    • 2004
  • Chlorella contains a rich source of biochemical products with applications in the feed, food, nutritional, cosmetic, pharmaceutical and even fuels industries. Chlorella is one of unicellular green algae and is mostly grown in fresh water such as pond and lake. It grows in a manner of nonsexual reproduction so that it multiplies 4~16 times overnight. Large-scale culture is conducted by open pond culture or pure culture using fermenter. Chlorella has various efficacies such as heavy metal removal, degradation of toxic materials, control of arteriosclerosis, immunoprotective effects, anticancer activity and growth-stimulating activity of intestinal bacteria. Chlorella can be used as a taste enhancer and foodstuff, as it has a plenty of essential amino acids, polyunsaturated fatty acids, sterols and chlorella growth factor (CGF). Chlorella is a potential organism which can be utilized for CO$_2$ removal and H$_2$ Production in environmental area and energy Production.

Safety Assessments for the IS(Iodine Sulfur) Process in a Hydrogen Production Facility (수소생산시설에서의 요오드-황 공정에 대한 안전성 평가연구)

  • Lee, Hyon-Woo;Jae, Moo-Sung;Cho, Nam-Chul;Yang, Jon-Eon;Lee, Won-Jae
    • Journal of the Korean Society of Safety
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    • v.24 no.3
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    • pp.54-58
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    • 2009
  • A substitute energy development has been required due to the exhaust of the fossil fuel and an environmental problem. Consequently, possible technologies producing hydrogen from water that does not release carbon is a very promising technology. Also, Iodine-Sulfur(IS) thermochemical water decomposition is one of the promising processes that are used to produce hydrogen efficiently using the high temperature gas-cooled reactor(HTGR) as an energy source that is possible to supply heat over 900$^{\circ}C$. In this study, to make a initiating events identification for the IS process, Master Logic Diagram(MLD) is used and 9 initiating events that cause a leakage of the chemical material are identified. Also, 6 events are identified among 9 initiating events above and are quantified using event tree.

Life Prediction of Elastomeric U Seals in Hydraulic/Pneumatic Actuators Using NSWC Handbook (NSWC를 활용한 유공압 액추에이터 U 형 씰의 수명예측)

  • Shin, Jung Hun;Chang, Mu Seong;Kim, Sung Hyun;Jung, Dong Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.12
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    • pp.1379-1385
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    • 2014
  • Even the rough prediction of the product test time before the lifetime test of mechanical component begins would be of use in estimating cost and deciding how to keep up with the test. The reliability predictions of mechanical components are difficult because failure or degradation mechanisms are complicated, and few plausible databases are available for lifetime prediction. Therefore, this study conducted lifetime predictions of elastomeric U seals that were respectively installed in a hydraulic actuator and a pneumatic actuator using lifetime models and a field database based on failure physics and an actual test database obtained from the NSWC handbook. To validate the results, the predicted failure rates were compared with the actual lifetime test results acquired in the lab durability tests. Finally, this study discussed an engineering procedure to determine the coefficients in the failure rate models and analyzed the sensitivity of each influential parameter on the seal lifetime.

Study of Wear Characteristics of Hydraulic Equipment Used in Power Plants (발전소용 유압기기의 마모특성 연구)

  • Lee, Yong Bum;Lee, Gi Chun;Chang, Mu Seong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.9
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    • pp.1183-1188
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    • 2013
  • The reliability of hydraulic equipment used in power plants is especially important because failures that occur in the power plant can have a great ripple effect on human lives and financial losses. In this study, specimens using the materials used in the spool and sleeve of hydraulic valves of power plants have been produced, heat-treated, and tested under the precipitation conditions of phosphate ester hydraulic fluid with a variety of conditions. 23 full factorial designs have been applied to evaluate the significance of factors that affect the wear loss of the specimen, specifically, the load, velocity, and temperature. The significance evaluation was performed on the main effects and two-way interactions for wear loss based on the experiment results, and the mathematical equations between the wear loss and the three factors were derived from the analysis results.

Reliability Analysis of Mechanical Component with Multiple Failure Modes (다수의 고장모드를 가지는 기계부품의 신뢰성 분석)

  • Chang, Mu Seong;Choi, Byung Oh;Kang, Bo Sik;Park, Jong Won;Lee, Choong Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.9
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    • pp.1169-1174
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    • 2013
  • Most products are indeed governed by multiple failure modes. However, there are few cases in which reliability analysis applies to only one failure mode at a time. Furthermore, reliability data do not include information about failure modes, or the reliability analysis is performed using a representative failure mode. The Weibull shape parameter for failure modes is more important than one for products in the reliability qualification test. This paper presents reliability analysis methods for a mechanical component with multiple failure modes. These methods include the competing failure modes (CFM) method and the mixed Weibull method. Pneumatic cylinder test data with three failure modes are presented to estimate the shape parameter for each separate failure mode. In addition, reliability measures (B10 life, characteristic life) of the pneumatic cylinder considering three failure modes were compared with those assuming a single failure mode.

Making an Emotional Design Book with 5 Senses and Inspiration -Focused on the Art Book 5+1(Five Plus One)- (오감과 영감을 활용한 감성북 편집디자인 연구)

  • Hong, Dong-Sik
    • The Journal of the Korea Contents Association
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    • v.10 no.5
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    • pp.144-151
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    • 2010
  • Five Plus One' is a result of visual expressions on five senses such as the sense of sight, hearing, smell, taste, and touch. Although I searched for the data on five senses, there were only information which was quoted in various languages and scientific bases, and also most of the books written were far from artistic expressions including visual pleasure and emotional expressions. In addition, most materials were mainly textbooks for children's intellectual development, academic papers, and medical publications. Therefore, I made this book that makes us to communicate about five senses and an inspiration even though we have a problem to read writings in both Korean and English. I arranged visual elements using illustrations and typography in various ways based on the scientific evidence.

Design of Switching Fabric Supporting Variable Length Packets (가변 길이 패킷을 지원하는 스위칭 패브릭의 설계)

  • Ryu, Kyoung-Sook;Kim, Mu-Sung;Choe, Byeong-Seog
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.3
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    • pp.311-315
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    • 2008
  • The switching fabric used to make high speed switching for packet transfer between input and output interface in recent internet environments. Without making any changes in order to remain ATM switching fabric, the existing structures should split/reassemble a packet to certain size, set aside cross-point buffer and will put loads on the system. In this paper, we proposed a new switch architecture, which has separated data memory plane and switching plane packet data will be stored on the separate memory structure and simultaneously only the part of the memory address pointers can pass the switching fabric. The small mini packets which have address pointer and basic information would be passed through the switching fabric. It is possible to achieve the remarkable switching performance than other switch fabrics with contending variable length packets.

A Perceptual Study on the Temporal Cues of English Intervocalic Plosives for Various Groups Depending on Background Language, English Listening Ability, and Age (언어별, 연령별, 수준별 집단에 의한 모음간 영어 파열음 유/무성 인지 연구)

  • Kang, Seok-Han
    • Speech Sciences
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    • v.13 no.2
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    • pp.133-145
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    • 2006
  • In order to understand the various groups' perceptual pattern in both VCV trochee and iambus, this study examined the identification correctness and cue robustness for the unit intervals in light of background language, age, and English listening ability. The 4 groups of Native Speakers of English, Korean College Students of High Listening Achievement, Korean College Students of Low Listening Achievement, and Korean Elementary Students took part in the experiments. Tokens of $/d{\ae}per,\;d{\ae}per,\;d{\ae}per,\;d{\ae}per,\;d{\ae}per,\;d{\ae}per$ in trochee and of $/{\eth}{\partial}\;p{\ae}d,\;{\eth}{\partial}\;b{\ae}d,\;{\eth}{\partial}\;t{\ae}d,\;{\eth}{\partial}\;d{\ae}d,\;{\eth}{\partial}\;k{\ae}d,\;{\eth}{\partial}\;g{\ae}d/$ in iambus were extracted and modified into experimental signals composed of two digits(voiced-1, voiceless-0) by following the temporal intervals, in which the signals consisted of preceding vowel, closure, VOT, and post-vowel. In the first experiment of identification correctness in VCV iambus environment, all groups showed almost 100% correctness rate, while in trochee environment all groups were different(native speaker 87%, college high 74%, college low 70%, elementary 65%). In the second experiment of cue robustness, all groups showed the similar perceptual pattern in both environments. There was the order of robustness cues in VCV trochee: pre-vowel ${\gg}$ closure ${\gg}$ VOT ${\gg}$ post-vowel, while the order in VCV iambus: VOT ${\gg}$ post-vowel ${\gg}$ closure ${\gg}$ pre-vowel. In some condition, however, we found moderately different perceptual pattern depending on language, age and listening level.

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Protein Concentrate from Ginseng Leaf and its Nutritive Value (인삼엽 단백질의 추출 및 영양가)

  • Kim, Ji-Hwa;Lee, Mu-Seung;Nam, Chang-Woo
    • Korean Journal of Food Science and Technology
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    • v.21 no.3
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    • pp.441-445
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    • 1989
  • This study was investigated to evaluate the feasibility of protein concentrate for human food from ginseng leaf. The protein concentrate was prepared from ginseng green leaf by treating with cold acetone , followed by protein extraction with 0.2% NaOH containing 0.5% 2-mercaptoethanol and 0.5% sodium dodecyl sulfate. Proximate composition of the ginseng leaf protein concentrate (LPC) showed that fat and ash was less than 1%, protein was about 75%, total sugar and total saponin was 5% and 1.2%, respectively. As compared to the provisional amino acid pattern reported by FAO/WHO, ginseng LPC was found to be poor in S-containing amino acids, which were the first limiting amino acid. The amino acid score and E/T ratio of ginseng LPC were 43.1 and 3.02, respectively. Digestibility of ginseng LPC by pepsin and trypsin was lower than that of milk casein.

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