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直線型 誘導電動機의 實驗裝置 開發을 위한 基本理論의 硏究
張錫明,朴俊灝 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(B)
This paper dealt with the distributive phenomena of the induced eddy current on the secondary conductive sheet, the transverse air-gab flux density of a double sided linear induction motor with Goodness factors. According to the results of this study, we obtain knowledges that the eddy current on the conductive sheet is induced to the maximum vlaue in the vicinity of the synchronous velocity and the transverse air-gap flux density is distributed uniformly at goodness factor G=10. The fundamental data in this study are made references to improve the characteristics and the design of linear induction motors.
안태석,최승익,변명섭,박호완 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
To define the ecological roles of bacteria in Lake Soynng, the depth profiles of bacterial numbers and their biovolume were estimated temporally. In August, 1992, the bacterial numbers and biovolume were ranged from 12×10^(5) to 28×10^(5) cells ml^(-1) and from 0.4 to 1.0 ㎛³ cell^(-1), respectively. At 30m depth, the biovolume was highest as 1.0㎛³ cell^(-1) while the numbers were not changed. These large bacteria might be allochthonous bacteria originated from terrestrial during the heavy rain. In October, 1882, the bacterial numbers were ranged from 6×10^(5) to 17×10^(5) cells ml³ , and biovolumes at epilimnion were about 0.5 ㎛³ cell^(-1), while at metalimnion and hypolimnion, larger than 0.9 ㎛³ cell^(-1). In this time, zooplankton grazing pressure and nutrients release from sediment might affect the bacterial numbers and biovolume. In April, 1993, when Asterionella and Fragifaria were dominant species of phytoplankton only in epilimnion, the bacterial numbers were about 20×10^(5) cells ml^(-1), and biovolumes were about 0.8㎛³ cell^(-1). While at other depths, the numbers and biovolumes were smaller. These results suggest that the bacterial numbers were dynamically changed with season, while their mean cell volume were commonly stable as 0.5㎛³ cell^(-1). But by the allochthonous bacteria, organic materials released by phytoplnnkton and grazing pressure by zooplankton might increase the biovolume.
Tubular Motor의 動作特性解析 및 開發에 관한 硏究
李殷雄,張錫明,朴允鎬 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.1
This study is to develop the tubular linear induction motor(TLIM) which consists of a travelling aluminum bar and concentric stator windings through examination of theoretical and experimental performance characteristics at slip 0.5% i. e. vector potential, magnetic flux density, thrust force, and power factor in a TLIM. In this study authors examine the practical values of this type motor from the mechanical and economical points of view, and suggest some criteria to have an efficient machine.
갯기름나물 경엽생산을 위한 적정 녹비작물 선발 및 시용효과 구명
Myeong Seok Kim,Ho Sub An,Gil Ja Kim,Yong Soon Kim,Jin Gyung Choi,Heung Gyu Park,Hyun Woo Kim,Seong Il Kim,Young Guk Kim,Chun Geun Park,Jae Gi Chang 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.05
Background : The purpose of this study was to evaluate methods to high quality medicinal vegetables, thereby increasing farm income. This study investigated the effects of different green manures crop and application culture stable foliage production in Peucedanum japonicum Thunberg. Methods and Results : Method of application with green manure crop were conducted under four condition compose to control (non application), single cropping in barley, hairy vetch and mixed cropping in hairy vetch (60%) + barley (40%)culture. Sowing dates of green manure crop were October 14 in 2014. Transplanting with Jeonam Yeosu varieties in Junel 28 by growing pot seedling for 45 days in 2015. Method of application were standard application (N-P-K-Compost applied at 20-12-10-600 ㎏․10 a−1). Plants were spaced 10 ㎝ apart in rows 10 ㎝ apart with open cultivation. Conclusions : The utilization effect of nitrogen supplied by green manure crop was highest with the hairy vetch by 21.1% in single cropping and hairy vetch + barley by 29.8% in mixed cropping. Organic matter, available phosphate, K2O, CaO, and MgO of soil increased in plots with the mixed cropping hairy vetch + barley culture. Non application < barley < hairy vetch < hairy vetch + barley in mixed cropping, aerial part as a result were so many such amount of growth as number of leaf per plant, etc., green leaf yields is untreated control plot (1,876 kg․10 a−1) compared to 7% from using barley culture, hairy vetch culture 10% higher and hairy vetch + barley culture increased to 15% of the most.
Seok-Myeong Jang,Ho-Jun Seo,Yu-Seop Park,Hyung-Il Park,Jang-Young Choi IEEE 2012 IEEE transactions on magnetics Vol.48 No.11
<P>With the main objective of substituting a generator without a conventional Nd-Fe-B permanent magnet (PM), this paper describes the application of ferrite PM to a 1.5 (kW) wind power generator and proposes a newly designed generator with similar performance and machine size as the equivalent conventional Nd-Fe-B PM generator. The conventional generator with Nd-Fe-B PM was slotless in order to eliminate the cogging torque resulting from the PM and the tooth-slot structure. The magnetic structure of the proposed ferrite generator was newly designed using an analytical approach to obtain satisfactory performance. All analysis results were validated through experiments with a manufactured model, confirming the possibility of substitution of Nd-Fe-B magnet with ferrite magnet in such generators.</P>
Modern Software Defined Radar (SDR) Technology and Its Trends
Myeong-Seok Park,In-Sang Woo,Jung-Soo Jung,Young-Kil Kwang 한국전자파학회JEES 2014 Journal of Electromagnetic Engineering and Science Vol.14 No.4
Software defined radar (SDR) is a multi-purpose radar system where most of the hardware processing is performed by software. This paper introduces a concept and technology trends of software defined radar, and addresses the advantages and limitations of the current SDR radar systems. For the advanced SDR concept, the KAU SDR Model (KSM) is presented for the multimode and multiband radar system operating in S-, X-, and K-bands. This SDR consists of a replaceable multiband antenna and RF hardware, common digital processor module with multimode, and open software platform based on MATLAB and Lab VIEW. The new concept of the SDR radar can be useful in various applications of the education, traffic monitoring and safety, security, and surveillance depending on the various radar environments.
Edge-Exfoliated Graphites for Facile Kinetics of Delithiation
Park, Jeong-Seok,Lee, Myeong-Hee,Jeon, In-Yup,Park, Han-Saem,Baek, Jong-Beom,Song, Hyun-Kon American Chemical Society 2012 ACS NANO Vol.6 No.12
<P>As high rate charge and discharge characteristics of energy storage devices become more important with the market of electric vehicles intensively growing, the kinetics of lithiation or delithiation of electrode materials for lithium ion batteries require enhancement. Graphites, the most widely used anode materials, have a limited power density at high discharge rates, while their alternatives, such as silicon and transition metal oxides, show even inferior rate capability. This work was motivated from an idea of what if the edge opening of graphite was zipped more open to lithium ions in the electrolyte. By edge-selective functionalization, the peripheral <I>d</I>-spacing of graphite (<I>d</I><SUB>0</SUB>) was locally controlled. Larger values of <I>d</I><SUB>0</SUB> led to higher capacity especially at high discharge rates. Around 2-fold enhancement of capacity or energy density was achieved at 50C discharge rate from 110 to 190 mAh g<SUP>–1</SUP> by exfoliating graphite locally in its edge region. Also, the <I>d</I><SUB>0</SUB> dependency of delithiation kinetics confirmed that the electrochemical step of Li<SUP>+</SUP> influx into or efflux out of the interlayer space of graphite is possibly the rate-determining step of lithiation or delithiation.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-12/nn3050227/production/images/medium/nn-2012-050227_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn3050227'>ACS Electronic Supporting Info</A></P>