• Title/Summary/Keyword: LED Drive

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A Study on the Effect of the Motor Drive in Simulation Analysis by Induction Motor Parameters Using a Matlab & PSPICE (Matlab과 PSPICE를 이용한 유도전동기 파라미터에 의해 전동기 운전에 미치는 영향 분석에 관한 연구)

  • Na, Seung-Kwon;Ku, Gi-Jun
    • Journal of Advanced Navigation Technology
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    • v.16 no.6
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    • pp.1005-1013
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    • 2012
  • In this paper, the induction motor in indirect vector control method modeling, from indirect vector control method it undergoes an influence to the $1/{\tau}$. When changing a rotor resistance because being like this quality Matlab/Simulink where it will make what kind of effect in speed presumption it led proposed control system used microprosser TMS320C31 DSP for high speed processing. The effectiveness of the proposed system is verified by simulation and experimental results. This result shows highly characteristic speed estimation and robust character of load regulation. and the flux which it follows in change of parameter and speed presumption it was under simulation and get the good result which it comes to get it analyzed.

Prolonged Exposure to Lipopolysaccharide Induces NLRP3-Independent Maturation and Secretion of Interleukin (IL)-1β in Macrophages

  • Hong, Sujeong;Yu, Je-Wook
    • Journal of Microbiology and Biotechnology
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    • v.28 no.1
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    • pp.115-121
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    • 2018
  • Upon sensing of microbial infections or endogenous danger signals in macrophages, inflammasome signaling plays a significant role in triggering inflammatory responses via producing interleukin (IL)-$1{\beta}$. Recent studies revealed that active caspase-1, a product of the inflammasome complex, causes maturation of inactive pro-IL-$1{\beta}$ into the active form. However, the underlying mechanism by which this leaderless cytokine is secreted into the extracellular space remains to be elucidated. In this study, we demonstrated that prolonged lipopolysaccharide (LPS) treatment to macrophages could trigger the unexpected maturation and extracellular release of IL-$1{\beta}$ through a nucleotide-binding oligomerization domain-like receptor family, pyrin domain-containing 3 (NLRP3)-independent manner. Short-term treatment (less than 6 h) of LPS induced robust production of the IL-$1{\beta}$ precursor form inside cells but did not promote the maturation and secretion of IL-$1{\beta}$ in bone marrow-derived macrophages or peritoneal macrophages. Instead, prolonged LPS treatment (more than 12 h) led to a significant release of matured IL-$1{\beta}$ with no robust indication of caspase-1 activation. Intriguingly, this LPS-triggered secretion of IL-$1{\beta}$ was also observed in NLRP3-deficient macrophages. In addition, this unexpected IL-$1{\beta}$ release was only partially impaired by a caspase-1 and NLRP3 inflammasome inhibitor. Collectively, our results propose that prolonged exposure to LPS is able to drive the maturation and secretion of IL-$1{\beta}$ in an NLRP3 inflammasome-independent manner.

Study on Chemical Stabilities with R-1234yf Refrigerant of Polyol Ester Refrigerant Oil for Electric Vehicles (전기 자동차용 폴리올 에스테르계 냉동기유의 R-1234yf 냉매와의 적합성 연구)

  • Hong, J.S.;Chung, K.W.;Kim, N.K.;Shin, J.H.;Kim, Young Woon;Lee, E.H.;Go, B.S.;Hwang, S.Y.
    • Tribology and Lubricants
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    • v.36 no.3
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    • pp.139-146
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    • 2020
  • Global warming has led to an increase in demand of eco-friendly vehicles, such as electric cars, for reducing greenhouse gas emissions, and especially, regulating carbon dioxide generation. In addition, electric vehicles are equipped with an electric drive-type hermetic scroll compressor and a refrigerant, which exhibit current and future trends of using environmentally friendly refrigerants, including R-1234yf. In this study, polyol ester-based refrigeration oils are prepared via condensation esterification of polyol and fatty acids. The oils can be combined with R-1234yf refrigerant for applications in air conditioning and cooling systems of electric vehicles. The structure of synthetic polyol esters is confirmed via 1H-NMR and FT-IR spectrum analysis, and the composition of the polyol ester is analyzed via gas chromatogram analysis. Furthermore, kinematic viscosity, viscosity index, total acid value, pour point, and color are analyzed as fundamental physical properties of the synthetic polyol esters. The compatibility and chemical stability of the synthetic polyol ester combined with the R-1234yf refrigerant are obtained via high temperature and high pressure oil-resistant refrigerant tests. The changes in the oil color and catalyst activity are observed before and after the experiment to determine whether it is suitable as a refrigerator oil.

Study on Clinical Diseases of Yang Deficiency Pattern (양허증(陽虛證)의 임상적 질환 범위에 대한 고찰)

  • Park, Mi Sun;Ki, Yeong Mok
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.27 no.2
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    • pp.153-166
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    • 2013
  • Yang deficiency pattern is a representative syndrome differentiation. This article is a study on to which categories of modern diseases yang deficiency is assigned by reference to modern clinical papers and the meaning of yang deficiency interpreted with a perspective of Korean Medicine and a modern perspective. Yang deficiency, yang qi deficiency, lack of yang qi and yang qi debilitation are the words found in "Nei Ching" and yang qi can be interpreted as something to warm, drive and arouse. Zhangzhongjing considered recovery or loss of Yang as the key to life in "Shanghanlun". Danxi proposed "Yang being liable to hyperactivity, Yin being insufficient" and emphasized pathological ministerial fire of Yang exuberance rather than physiological ministerial fire of Yang deficiency. Zhangjingyue proposed "Yang not being in excess, Yin being often deficient" and understood growth and decline of yin qi are all led by yang qi and put emphasis on true yin in addition to yang qi. Diseases of yang deficiency pattern are related with decline of metabolic level, hypofunction of internal secretion, disorder of immune function, disorder of automatic nerve system, sympathetic nerve inhibition, metabolic disorder of microelements, increase of cGMP, change of microcirculation, low speed of blood stream, kidney malfunction. Diseases related with kidney are sterility, polycystic ovary syndrome, spinal stenosis, edema, renal failure, IgA nephropathy, erectile dysfunction, nephritis, prostatitis, benign prostatic hyperplasia, decrease of adrenal cortical hormone by nephrotic syndrome, myelodysplastic syndrome. Disease related with heart are heart failure, arrhythmia, cardiomyopathy, atherosclerosis heart disease, hypertension, hyperlipidemia, pulmonary heart disease. Diseases related with spleen are irritable bowel syndrome, ulcerative colitis. Diseases related with liver are hypothyroidism, liver cirrhosis ascites, hepatitis B, chronic hepatitis, hepatic diabetes. Diseases related with lung are allergic rhinitis, cough variant asthma, bronchial asthma, pulmonary emphysema. And diabetes mellitus, metabolic syndrome, aplastic anemia, headache, encephalatrophy, Alzheimer's disease are also related with yang deficiency.

Experimental Techniques for Evaluating the Success of Restoration Projects

  • Robinson, George R.;Handel, Steven-N.l;Mattei, Jennifer
    • The Korean Journal of Ecology
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    • v.25 no.1
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    • pp.1-7
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    • 2002
  • The ecological background of a restoration project is complex and difficult to betermine without experimentation. A useful context for experiments is the well-studied process of natural succession, because the factors that drive or inhibit succession are also at work during reclamation (a form of primary succession) and restoration (which often resembles secondary succession). Using experimental studies on urban wasteland reclamation, we have tested for factors that stimulate or inhibit succession during early phases of woodland development in the Northeastern United states. The emphasis has been on mutualisms (seed dispersal, pollination, and mycorrhizae) and microsite limitations in the recruitment, growth, and reproduction of woody plants. Using plantings of seeds, seedlings, and clusters of reproductively mature plants on abandoned landfills, we have observed that (1) soil microsite deficiencies lead to very poor germination (<0.1$\%$) and seedling survival (<0.01$\%$) of most native species; (2) seed dispersal by birds is a significant and reliable source of woody plant recruitment; however (3) proximity effects are strong, with most (up to 95$\%$) of seed rain falling in the vicinity of planted clusters that are closest to putative seed sources; and (4) remnant natural woodlands are critical components of the recruitment process. To emphasize the last point, in one case, we found that the destruction of approximately 50$\%$ of nearby natural woodland vegetation led to a commensurate decline in seed rain. In another case, we found that the species richness of recruits was strictly limited by the species composition of nearby source plant communities, with no evidence of community enrichment by long distance dispersal over 5 years. We conclude from these results that the size and proximity of remnant natural populations are critical considerations when planning reclamation and restoration programs that rely on natural successional processes.

Designing a Embedded System for Remote Control of LDM (LDM 원격 제어를 위한 임베디드 시스템 구성)

  • Moon Cheol-Hong;Kang Sang-Woo
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.42 no.8 s.338
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    • pp.27-34
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    • 2005
  • In this paper, FPGA It/w and S/W Embedded system for LDM remote control is implemented. XScale CPU is used on developed system and in communcation ethenet and serial is used. CPU interface with H/W LDM rotation and to drive LDM FPGA logic is implemented, to transmit LDM data from long distance command packet is composed, for S/W Embedded linux is used to design linux device driver and linux application program. This S/W is run by module so by loading this module to linu)( file system it can do any movement. Also by compiling Embedded linux to the system it can lower the price of the system. By using this H/W and S/W theory it can be used on any other embedded system.

A Phenomenological Study on Field Experiences of Radical Social Workers (급진사회운동가들의 사회복지실천현장 경험에 대한 현상학적 연구)

  • Kim, Sung Chun;Kim, Eun Jae
    • Korean Journal of Social Welfare
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    • v.68 no.2
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    • pp.53-77
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    • 2016
  • This research is performed to verify a suggestive understanding and undertone on radical social workers's balanced practical experiences responding to the current situation to discover the new practical way of Korean social work so as to overcome the limitation of the above mentioned microscopic approach. It focuses on Giorgi's descriptive phenomenological study and further relating areas to provide information on Radical Social Workers'(RSW) social work practical and specific experiences and fundamental implication. This research has been participated with 9 RSWs, led the past democratic movement, have participated with this research. The data covers 84 meaningful units, 24 exposed topics, and 7 essential themes. The essential themes are as follow; lifting a latch into prepared changes, unavoidable destiny, drive for change from the bottom, collaborated forces of minority groups, changing the oppressive laws and institutions to more favorable ones for minorities, being patient and waiting required as birds breaking eggs to become a bird. Based on the collected data, Researchers discuss the main features and issues of our instituted social work practices.

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Modeling of the driving pattern for energy saving of the railway vehicles (철도차량의 주행에너지 절약을 위한 열차 주행 패턴 모델링)

  • Kim, Jung-Hyun;Kim, Sang-Hoon;Shin, Han-Chul;Lee, Se-Hoon
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2011.01a
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    • pp.107-108
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    • 2011
  • Since the development of railway technology, the current urban Railway the first train line in the country for safe operation control automatic/unattended operation, automatic train operation equipment available (ATO) on time and reliable operation has introduced. ATO Automatic operation controlled by the value (Target velocity) and the feedback value (Actual velocity) by the error between the backing and braking of the train by repeated low energy efficiency. In this paper, given a fixed distance stations between time operation with minimal energy in the driving characteristics and driving trains are modeled. Therefore, in line 5 real route time sectional drive straight sections for experimental data analysis / draft Section / curved and section of the train on that line is selected according to the changing driving patterns to minimize the energy optimal driving patterns were presented.

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A study on Digital New deal Strategy for Inclusive Innovative Growth and Job Creation (포용적 혁신성장과 일자리 창출을 위한 디지털 뉴딜 전략에 관한 연구)

  • Noh, KyooSung
    • Journal of Digital Convergence
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    • v.18 no.1
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    • pp.23-33
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    • 2020
  • This study discussed 'inclusive growth', which recently has gained attention as the 4th Industrial Revolution spreads, and considered innovative growth as a requirement for inclusive growth. Combining inclusiveness and innovativeness, a new concept of 'Digital New Deal' is suggested. Specifically, the new market creation strategy through digital transformation of existing industries and public sectors, and solving social problems were presented. It also analyzed problems of the past government-led top-down innovation drive and suggested the "Hybrid" approach as a new way of promoting digital New Deal. Finally, we looked at the 'job creation' effect, discussed the meaning of it in terms of inclusiveness and innovativeness, and proposed a policy alternatives to create lasting effects.

Site and Erection of the Government Complex Seoul in Capital Seoul (수도 서울에서 정부종합청사의 입지와 건립)

  • Lee, Sumin;Woo, Don-Son
    • Journal of architectural history
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    • v.27 no.2
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    • pp.51-62
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    • 2018
  • This study examines the site and erection of the Government Complex Seoul which was a project attempted to assemble dispersed government buildings in a certain place. The study focuses on the fact that the project is situated between the 1960s' making of capital Seoul and Seoul urban planning, and the way how the project achieved symbolism in capital Seoul. The project, one of the 1960s' Major Government Buildings, led both plan of capital Seoul and transforming city Seoul. The 1960s' Major Government Building Plan had identical drive with the 1950's Major Government Building Plan, however the 1960s' had additional layer: Seoul urban planning. After restoration of the Capital building, Sejongro the capital street was planned to the site arranging government offices. The Government Complex Seoul was set to be a modern building on a site with historical context according to the plan. Because of the site, the Government Complex Seoul was constructed in aware of other buildings that represented a competitive high-rise atmosphere in the late 1960s, including the Capital building nearby. PAE International's plan was completed through a series of design modification, and it boasted a vertical aspect, unlike the horizontal-looking plan that was already won after the design competition. The Government Complex Seoul tried to acquire the symbolism in the central space of the capital Seoul and high-rised city Seoul. "The new construction method" was a requirement to achieve the height.