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A Preliminary Study on CF4 Decomposition Reaction Mechanism Using High Temperature Flow Reactor (고온 유동 반응기를 이용한 CF4 분해 반응기구에 대한 선행 연구)

  • Kim, Yoeng-Jae;Lee, Dae Keun;Kim, Seung Gon;Noh, Dong-Soon;Ko, Chang-Bog;Kim, Yongmo
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.157-159
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    • 2015
  • In this study, $CF_4$ decomposition was experimentally investigated in a high temperature flow reactor. Effects of temperature, reactant composition and concentration, and residence time on its decomposition into other stable species were analyzed. Then the results were compared to numerical results obtained using Chemkin Plug Flow Reactor model with Princeton Chemistry. As a preliminary result higher decomposition rate is obtained for higher reactor temperature and long residence time when proper reactants are supplied.

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Community Composition and Adapted Environment of Sundew (Drosera rotundifolia) in Koppler Moor, Austria (Austria Koppler Moor에 서식하는 끈끈이주걱(Drosera rotundifolia)의 군란형성과 적응환경)

  • 이종운
    • Journal of Life Science
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    • v.10 no.2
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    • pp.169-176
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    • 2000
  • At Koppl area, undamaged natural habitat of sundew, I have analysed interspecific affinities and community composition through mathematical method and important environmental factors. Interspecific affinities of the species with frequency of more than 5% in vegetation table were analysed through chi-square test and showed obvious group of Drosera rotundifolia, Vaccinium uliginosum, Calluna vulgaris, Eriophorum angustifolium and 21 species. The result of ordination anlysis using DECORANA of VESPAN II showed eigenvalue of 0.6047 for axis I, 0.2024 for axis II and 0.0763 for axis Ⅲ. And it divided into 4 groups of quadrat number 1-5 for Sphagnum squarrosum-community, 6-10 for Crepis paludosa-community. 11-25 for Carex panicea-community and 26-35 for Scorpidium scorpioides-community. By the classification using TWINSPAN, the 7 areas divided into 2 groups of 1-10 and 11-35 at first level of division with high eigenvalue of 0.588 and indicator was Sphagnum squarrosum. At second level of division it divided into 4 groups as the results of DECORANA with eigenvalues of 0.268 and 0.423 and indicators were Pinguicula vulgaris and Scorpidium scorpioides. Microclimatic environment of studied area was low in temperature and high in humidity and soil environment showed high in field moisture capacity, acid, high organic matter content, low NO3 and K2O content, compare to normal soil, and high ground water level.

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Dynamic Force Analysis of the 6-DOF Parallel Manipulator

  • Tanaka, Yoshito;Yun, So-Nam;Hitaka, Yasunobu;Wakiyama, Masahiro;Jeong, Eun-A;Kim, Ji-U;Park, Jung-Ho;Ham, Young-Bog
    • Journal of Power System Engineering
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    • v.19 no.6
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    • pp.5-11
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    • 2015
  • The 6DOF (degrees of freedom) Parallel Manipulators have some advantages that are high power, high rigidity, high precision for positioning and compact mechanism compared with conventional serial link manipulators. For these Parallel Manipulators, it can be expected to work in the new fields such that the medical operation, high-precision processing technology and so on. For this expectation, it is necessary to control the action reaction pair of forces which act between the Parallel Manipulator and the operated object. In this paper, we analyze the dynamics of the 6DOF Parallel Manipulator and present numerical simulation results.

Study on Resistant Starch Contents and Cooking Characteristics of Commercial Extrusion-Cooked Noodles (시판 압출숙면류의 저항전분 함량과 조리특성)

  • Ryu, Bog-Mi;Kim, Chang-Soon
    • Korean journal of food and cookery science
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    • v.31 no.3
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    • pp.248-254
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    • 2015
  • We conducted this study to investigate the amount of RS and cooking characteristics of the commercial extrusion-cooked noodles. Ten kinds of noodles were selected and grouped according to the storage conditions; dry noodles (3), refrigerated noodles (2), freeze noodles (4), and dry noodle made from wheat flour as a control (not extrusion-cooked). The total starch of commercial noodles ranged from 62.50% to 84.13%, Refrigerated Naengmyeon and dry Dangmyun had high proportions of total starch (respectively 84.13% and 80.13%, respectively). The amounts of apparent amylose ranged from 25.01% to 42.93% and RS ranged from 0.61% to 5.99%. A high proportion of the total starch was rendered digestible by extrusion cooking, and a small amount of RS remained in the samples. Dry Dangmyun had the highest percentages of RS (5.99%), followed by refrigerated Naengmyeon C (2.41%) and dry Jjolmyeon (1.94%), and those of the other noodles were lower than that of the control (1.86%). Cooking properties and texture measurements were evaluated. Cooking loss and turbidity of cooking water were highest in dry Jjolmyeon and dry Naengmyeon. There was little cooking loss in dry Dangmyun and freeze rice noodles. In particular, dry Dangmyun and refrigerated Naengmyeon C containing high amounts of RS and amylose had relatively high measurements of hardness and tensile strength.

Development of an In-service Education Program for Emergency Room Nurses According to Their Career Ladders (응급실 간호사의 업무분석을 통한 경력등급별 실무교육안 개발)

  • Lee, Eun Nam;Kim, Bog Ja;Kim, Sung Sook;Kang, Kyung Hee;Kim, Young Soon
    • Journal of Korean Clinical Nursing Research
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    • v.14 no.1
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    • pp.99-111
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    • 2008
  • Purpose: This study was done to provide basic data for developing an in-service education program to improve nurses' quality. First, frequency of nursing activities and competency levels of emergency nurses according to their career ladders were compared through job analysis and then practical education programs were presented on based of the results. Method: Data were collected from 335 nurses working in emergency rooms in 31 tertiary hospitals. Data collection was done from September to November 2005 using the job analysis questionnaire. Results: There were 41 nursing activities that showed differences in frequency and 78 activities that showed differences in perceived competency level. Irrespective of emergency nurses' careers, activities that show high frequency but low competency were sputum liquefying therapy, assessment of cranial nerve function, identification of diagnostic radiology, and communication with various departments. In-service education content according to nurse's career ladders was presented by adding high frequency nursing activities and activities with low competency level even though having high frequency. Conclusion: There is a need to develop and provide in-service education programs, which consider nurses' difference in frequency and competency level for their career ladders.

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Research Trend of Oxide Magnetic Films with Atomically Controlled Pulsed Laser Deposition (원자층 제어 PLD를 이용한 산화물 자성 박막 연구의 동향)

  • Kim, Bong-Ju;Kim, Bog-G.
    • Journal of the Korean Magnetics Society
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    • v.22 no.4
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    • pp.147-156
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    • 2012
  • Recently, there have been considerable interests in various thin film growth techniques with atomically controllable thickness. Among them, atomically controlled pulsed laser deposition (PLD) technique is quite popular. We have developed advanced thin film growth technique using PLD and Reflection high energy electron diffraction (RHEED). Using the technique, the growth of oxide thin films with the precisely controllable thickness has been demonstrated. In addition, our technique can be applied to high quality thin film growth with minimal defect and bulk chemical composition. In this paper, our recent progresses as well as the current research trend on oxide thin films will be summarized.

pH Buffer Capacity and Acidification Resistance of Alum Paper Mill Sludge (Alum 제지슬러지의 pH 완충능과 산성화저항성)

  • Lee, In-Bog;Chang, Ki-Woon
    • Korean Journal of Soil Science and Fertilizer
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    • v.32 no.1
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    • pp.1-6
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    • 1999
  • To find the latent effect of paper mill sludges (PMS) with and without alum, and alum paper mill sludge compost(PMSC) on aluminum toxicity of crops, the pH buffer capacity and the acidification resistance index (ARI) for PMSs and PMSC were investigated, comparing to upland soil. Buffer capacities of PMS with and without alum, and PMSC were significantly higher than $2.5cmol^+kg^{-1}$ of check soil as 137, 250, and $147cmol^+kg^{-1}$, respectively. Owing to such high buffer capacity of PMS and PMSC, they showed to be well-resisted to acidification.

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Development of Active Vibration Isolation Equipments Using Fuzzy Method

  • Rim, Kyung-Hwa;Yang, Xun;An, Chae-Hun;Jin, Kyoung-Bog
    • Journal of the Semiconductor & Display Technology
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    • v.6 no.4
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    • pp.17-22
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    • 2007
  • Vibration isolation equipments are mostly required in precise measurement and manufacturing system. Among all the vibration isolation equipments, air-spring is the most widely used equipment because of low resonant frequency and high damping ratio. In this study, we used Takagi-Sugeno fuzzy method to design an active vibration isolation system using air-spring, and compared the fuzzy method with passive control method and PID control method. Due to the non-linearity characteristics of air-spring, fuzzy controller was verified to be the most effective both in simulation and experiment.

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Micro Valve with Functional Actuator (기능성 액츄에이터를 이용한 마이크로 밸브)

  • Yun, So-Nam;Ham, Young-Bog;Lee, Kyung-Woo;Kanda, Kunio
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.951-955
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    • 2004
  • Piezoelectric(PZT) actuator can substitute for solenoid which is used in fluid control field because it has faster response times and no possibility of explosion. Besides, it is available in a high temperature and it has low energy consumption. In this study, pneumatic micro valve, bimorph type PZT actuator using the softner type PZT, carbon plate as a shim and its controller circuit were suggested and investigated. Performance tests and characteristics analysis, such as displacement, force, hysteresis and frequency properties, were carried out. The displacement of the actuator measured at the end point was 63 ${\mu}m$., force of the actuator was 0.052 N and maximum operating frequency was 15Hz. Also, characteristics of the micro valve with PZT actuator were evaluated in a testing system. The results show that the suggested PZT actuator is suitable for micro valve.

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A Study on the Performance Certification of 5,200ton Compression Load Tester (5,200톤 재하 시험장비의 성능 검증에 관한 연구)

  • Kim, Kwang-Young;Choi, Young-Ho;Ham, Young-Bog;Choi, Byung-Oh;Lee, Dong-Ha
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.149-154
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    • 2001
  • In case of high capacity load force as millions of tons, it is difficult to measure the force with load cell. But we can measure and calculate the force with applied pressure and ram area of hydraulic jack. The 5,200 ton compression load tester is composed of thirteen hydraulic jack with 400 ton capacity. This paper explains the method of measuring the vertical compression load and provides characteristics of unit jack, and displacement of upper structure under maximum load condition.

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