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이경철,김하선,한상균,이경민,Lee,K.C.,Kim,H.S.,Han,S.K.,Lee,K.M. 국립한국농수산대학교 교육개발센터 2017 현장농업연구지 = Journal of practical agricultural resear Vol.19 No.1
This study was conducted to investigate of growth performances and net assimilation rate(NAR) of Allium microdictyon Prokh. distributed inland and Allium ochotense Prokh. originated Ulleung-do. The Allium microdictyon on the growth of 1-2 years showed the largest relative growth rate, and showed high relative growth from three to four years. Allium ochotense on the growth from one year to three years showed high relative growth rate. The T/R rate of Allium ochotense of 2~5years was in the range of 0.4~0.5. However, The T/R rate of Allium microdictyon was increased as increasing with age. This implies that Allium microdictyon was consumed more energy on growing subterranean part. The LWR of 1~3years old Allium ochotense. was showed more smaller than 4~5years old. It seems that the growth characteristics of Allium ochotense 1-3 years after sowing the leaf growth consume more energy than Allium microdictyon. Net assimilation rate(NAR) of Allium ochotense for 1-3 years after sowing was higher than that of Allium microdictyon. In this time, the material of Allium ochotense has a higher production efficiency can be seen indirectly.
토양 건조 및 침수처리가 박태기나무의 광계 II 활성에 미치는 영향
이경철,이의열,윤경규,권영휴,한상균,Lee, K.C.,Lee, U.Y.,Youn, K.K.,Kwon, Y.H.,Han, S.K. 국립한국농수산대학교 교육개발센터 2020 현장농업연구지 = Journal of practical agricultural resear Vol.22 No.1
This study was conducted to investigate the photosystem II activities of Cercis chinensis by soil water condition. Drought stress was induced by withholding water and waterlogging treatments was immerging the pots for 15 days. Results showed that the relative activities per reaction center such as ABS/RC, TRo/RC and Dio/RC were significantly increased compared with the control group after 12 days in waterlogging treatments. Particularly, Dio/RC increased substantially under waterlogging stress, indicating that excessive energy was consumed by heat dissipation. Furthermore, the performance index on absorption basis(PI<sub>abs</sub>) and responses to structural and functional PS II(SFI<sub>abs</sub>) were dramatically decreased after 15 days in both the drought and waterlogging treatments, which reflects the relative reduction state of the photosystem II. These results of chlorophyll a fluorescence by OKJIP analysis show that the sensitive changes photosystem II activity. Thus, on the basis of our results that Cercis chinensis was exhibited a strong reduction of photosynthetic activity to waterlogging stress, and OKJIP parameters such as ABS/RC, DIo/RC, PI<sub>abs</sub> and SFI<sub>abs</sub> could be useful indicator to monitor the physiological states of Cercis chinensis under soil water condition.
페라이트계 스테인리스 강 MAG 용접의 기계적 물성에 관한 연구
이경철,김재성,김현재,임경호,이보영,Lee, Gyeong-Cheol,Kim, Jae-Seong,Kim, Hyun-Jae,Lim, Kyoung-Ho,Lee, Bo-Young 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.2
Ferritic stainless steels have a good heat resistance and economic advantage. They are used for applications such as automotive exhaust systems where resistance to general corrosion is superior to carbon steels. However, there are not enough research for ferritic stainless steels on weldability mainly used as automotive exhaust manifolds. In this study, mechanical and microstructure properties of as-welded STS 429L and STS 444 ferrite stainless steels were confirmed by tensile, bending, hardness test, optical microscopy and scanning electron microscopy. Tensile strength of the STS 444 is higher than the STS 429L when it is a raw material. In contrast to this fact, STS 429L indicated higher tensile strength after butt welded. In addition, the hardness have a increasing tendency as getting down on the bead.
이경철,이천,Lee, Kyoung-Cheoul,Lee, Cheon 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.7
A Single-crystalline Mn-Zn Ferrite (110 orientation) was masklessly etched by focused Ar laser irradiation in an H$_3$PO$_4$ solution. The depth of the etched grooves increases with increasing a laser power, decreasing a scan speed, and increasing the H$_3$PO$_4$concentration. The width of the etched grooves increases with a increasing laser power, but was relatively insensitive to the scan speed and H$_3$PO$_4$concentration. High etching rate of up to 714 ${\mu}{\textrm}{m}$/s and an aspect ratio of 6 for vertical slab structure have been obtained by the light-guiding effect of the laser bean in the H$_3$PO$_4$ solution.
이경철,권영휴,이경민,한상균,Lee, K.C.,Kwon, Y.H.,Lee, K.M.,Han, S.K. 국립한국농수산대학교 교육개발센터 2017 현장농업연구지 = Journal of practical agricultural resear Vol.19 No.1
This study was carried out to establish a proper cultivation site and to diagnose the drought tolerance of Heracleum moellendorffii leaves by using pressure-volume curves. As a result of analysing data measured, the leaf of H. moellendorffii showed the osmotic pressure at full turgor (Ψ<sub>o</sub><sup>sat</sup>) was -1.0MPa, and that at incipient plasmolysis (Ψ<sub>o</sub><sup>tlp</sup>) -1.2MPa. Then, the value of maximum bulk modulus of elasticity Emax was 28MPa, showing the sightly strong drought tolerance of H. moellendorffii. Furthermore, the values of relative water contents RWC<sup>tlp</sup> and RWC<sup>*</sup> were above 88%, showing that the function of osmoregulation is somewhat better. Thus, responses to water relations such as Ψ<sub>o</sub><sup>sat</sup>, Ψ<sub>o</sub><sup>tlp</sup>, E<sub>max</sub>, RWC<sup>tlp</sup> and RWC<sup>*</sup> of H. moellendorffii showed it's slightly high drought tolerance property.
Long Term Average Spectrum을 이용한 성악가들의 Speaking Voice 분석
이경철,홍석진,진성민,Lee, Kyung-Chul,Hong, Seok-Jin,Jin, Sung-Min 대한후두음성언어의학회 2004 대한후두음성언어의학회지 Vol.15 No.2
Background and Objectives : Many studies have described and analyzed singer's formant and it has been shown that the epilaryngeal tube in the human airway is responsible for vocal ring, or the singer's formant. A similar phenomenon produced by trained singers in their speech led some authors to examine the speaker's ring. This study was designed to analyze the speaking voice of the singers and speaker's ring. Baterials and Methods : Ten tenors, fifteen baritones, fifteen sopranos and ten mezzo sopranos attending the music college, department of vocal music were chosen for this study. Fifteen male and fifteen female untrained normal speakers were chosen for control group. Each subject was asked to produce a sample of a sustained spoken vowel /ah/ sound for at least five seconds and read sentence 'Kaeul'. The sound data was analyzed using the Fast Fourier Transform(FFT) - based power spectrum, Long term average(LTA) power spectrum using the FFT algorithm of the Computerized Speech Lab(CSL, Kay elemetrics, Model 4300B, USA). Statistical analysis was performed using the Mann-Whitney test of the Statistical Package for Social Sciences(SPSS). Results : For LTA Power spectrum of/ah/ sound, a significant increase was seen in the 2,500-3,500Hz region(p<0.01) in four trained singer group compared with untrained speaker group, and a significant increase in the 9,000-10,000Hz region(p<0.01) in soparano group. Similarly, in sentence 'Kaeul', there was a significant increase in energy in the tenor, baritone, mezzo soprano group compared with the untrained speaker group in the 2,500-3,500Hz region(p<0.01), and a significant increase in all frequency region(p<0.01) in the soprano group. Conclusions : The LTA power spectrum suggests that trained singers group show more energy concentration in the 'singer's formant' region in the speaking voice, and authors believe this region to be the 'speaker's ring'. Further research is needed on the effect of singing training on the resonance of the speaking voice.
이경철,이종희,송병흠,신대원,Lee, K.C.,Lee, J.H.,Song, B.H.,Shin, D.W. 한국항공운항학회 2003 한국항공운항학회지 Vol.11 No.1
This study is performed to secure the safety of civil aviation by establishing systematic analysis ability of Flight Data Recorder. Through this study, downloading SSFDR(Solid State Flight Data Recorder) to personal computer, editing interface file, flight data numerical analysis and regulations relayed to the aircraft with carry diversion into execution are performed. In the analysis, the flight data of B747-400 model aircraft between Jeju(RKPC) and Gimpo(RKSS) was selected.