• Title/Summary/Keyword: Lagging

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Effects of soil covering materials on the overwintering and the growth of Cynanchum wilfordii Hemsley

  • Youn, Cheol Ku;Kim, Ki Hyun;Kim, In Jae;Lee, Hee Do;Hong, Seong Taek;Hong, Eui Yon;Kim, Young Kuk;Jang, Jae Gi
    • Proceedings of the Korean Society of Crop Science Conference
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    • pp.251-251
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    • 2017
  • This study was performed to select the soil covering materials for winter safety of Cynanchum wilfordii Hemsley and to investigate the effect on the growth after overwinter. Soil covering materials such as vinyl, rice straw, lagging cover, vinyl+lagging cover, and non-covering were investigated how effect on overwintering rate, growth and yield of Cynanchum wilfordii Hemsley. In changes of soil temperature according to the soil covering materials, non-covering treatment was recorded the highest to $26.7^{\circ}C$, and lagging cover and rice straw showed little change of soil temperature with 9.2 and $9.3^{\circ}C$, respectively. Regrowth rates of early growth after overwinter were lowered in the order as rice straw > vinly+lagging cover > lagging cover > vinyl > non-covering. From the above-ground growth by soil covering materials, vine length showed similar growth in all treatments except vinyl covering and stem diameter exhibited the thicker pattern in vinyl and lagging cover, and there was no significant difference among treatments in number of branch. Flowering period is recorded July 30 in all treatments and ripening period is October 16. Yield of seed production is showed the best in vinyl+lagging cover with $25g/m^2$. Root weight and root length for subterranean growth showed no significant differences among all treatments. Yield is produced the highest in vinyl+lagging cover with 433kg/10a and the next to lagging cover with 431kg/10a. In comparison with incomes, lagging cover earned to 9,882 thousand won/10a, showed the effect on income enlargement to 21%, compare to that of the non-covering.

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F0 Peak Lagging and Relative Timing in English Intonation

  • Kim, Sung-A
    • Proceedings of the KSPS conference
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    • pp.211-219
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    • 2000
  • In this paper, we examine fO peak lagging phenomenon in English. FO peak lagging refers to the fact that fO peak corresponding to an accent is realized beyond the domain of the host syllable. We present experimental data of fO peak lagging, which shows that fO peak is heavily delayed when the duration of the accented syllable is relatively short. In addition, we show that fO peak is also heavily delayed and realized in the following syllable in a focused word, even where the target vowel is not intrinsically short.

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Effect of covering materials on seedling quality of rice (못자리 피복재가 벼의 묘소질에 미치는 영향)

  • Song, Suk-Yeon;Kim, Tae-Heon;Sohn, Jae-Keun
    • Current Research on Agriculture and Life Sciences
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    • v.28
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    • pp.47-52
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    • 2010
  • This study was carried out to investigate the availability of covering material used for raising seedlings in the rice nursery bed. The pre-germinated seeds of a rice cultivar 'Chilbo' were sown into seedling tray ($60{\times}30{\times}2.5cm$) on 20th April and 3rd May 2010. Polypropylene spunbonded fabric (PSF) and lagging were used for covering materials in rice nursery bed. The growth characteristics of seedlings were evaluated at 8, 15 and 25 days after sowing (DAS) in the nursery beds covered with PSF and lagging, respectively. The plant height of 8-day old seedlings grown in lagging nursery bed was longer by 2cm than those in PSF nursery bed when the seeds were sown on 20th April, but seedling quality grown in lagging nursery bed was poor compared with that in PSF nursery bed. The growth characteristics of 15-day old seedlings were similar to that of 8-day old seedlings. The plant height of 8, 15 and 25-day old seedlings grown in lagging nursery was longer than those in PSF nursery when the seeds were sown on 3rd May. The seedling quality grown in PSF nursery was better than that in lagging nursery. The seedlings grown in PSF nursery have more leaves and better seedling quality compared with that of lagging nursery. The seedling quality was remarkably decreased with the increase of nursery period in lagging bed but seedlings quality were recovered at 5 days after hardening treatment by removing the lagging.

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The Differences of Temperatures, Growth and Crown Gall Occurrence in Young 'Kyoho' Grapevines According to Heat Conservation Materials during Winter (보온피복재 종류가 '거봉' 포도 유목의 월동시 온도 차이, 발아 및 근두암종병 발생에 미치는 영향)

  • Nam, Sang-Young;Kim, Seon-Kyu;Kim, Kyoung-Mi;Jung, Jai-Hyun;Choi, Kwan-Soon
    • Horticultural Science & Technology
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    • v.16 no.4
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    • pp.517-519
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    • 1998
  • This experiment was carried out to find out the effects of heat conservation materials (burying in soil, lagging, lagging +straw, nonwoven fabric, nonwoven fabric+straw) on freezing damage, labor saving, and crown gall occurrence of 'Kyoho' grapes. Temperature differences in burying in soil and lagging with $2.8^{\circ}C$ and $6.4^{\circ}C$, respectively and were considered favorable for over-wintering of grapevines. Heat conservation index in lagging +straw and burying in soil calculated from degree-hours below $-10^{\circ}C$ was 5 to 7 times higher than that of open field. Budbreak started earlier in lagging with+straw and nonwoven fabric+straw covering, and percent budbreak was increased by 22% and 7%, respectively, as well as higher than burying in soil. Diameter of bearing mother branch and length of internode and daughter branch were gross or long with soil and lagging straw and nonwoven fabric+straw. Cane growth was enhanced by burying in soil and lagging with+straw treatment. Crown gall occured higher in soil covered grape vines Labor saving was obtained in lagging with as much as 44% compared to burying in soil.

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A Study for Reducing Traffic Accident at Signalized Intersection - Focus on Left-turn Phase Sequence - (교차로 교통사고 감소방안에 관한 연구 - 좌회전 현시 순서를 중심으로 -)

  • Park, Jong-Wook;Lee, In-Won;Lee, Choul-Ki;Yang, Lyun-Ho;Lee, Gun-Sang
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.5 no.2
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    • pp.61-71
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    • 2006
  • The main purpose of this study is to search a method for reducing traffic accident at signalized intersections. One of the important factors for this is the Left-turn phase sequence. In 1985, the operational principle of Left-turn phase Sequence was changed from Lagging left-turn to Leading left-turn in Korea. Then there was a resonable motive-no exclusive left turn-lane and narrow intersection. So, it is necessary to evaluate the performance difference between Leading and Lagging left -turn phase Sequence. The process of this study is as follows: $\cdot$ First, all the intersection was divided three parts for analysis the traffic safety: Inside part of an Intersection, Crosswalk, Intersection approach and exit. $\cdot$ Second, a safety analysis was performed by using the concepts of 'Effective interphase Period(EIP)' and 'Conflict method' The Study result is that the benefit of of phase Sequence changes from Leading to Lagging phase were significant. For an example the Accident cost will reduced about 41.8 billion won per year in korea.

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Estimations for Unemployment Rate Variations in Business Coincident and Lagging Framework (경기동행과 후행 관계에서 실업률 변동성향의 추정)

  • Kim, Tae-Ho;Jung, Jae-Hwa
    • The Korean Journal of Applied Statistics
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    • v.25 no.1
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    • pp.45-54
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    • 2012
  • Published employment statistics do not provide enough information about the relationship of unemployment and economic and business conditions. This study investigates long-run equilibrium relations and short-run adjustment process of unemployment and discouraged unemployment with major price variables in the business coincident and lagging framework. Speed of adjustment from short-run disequilibrium to long-run equilibrium is found to be relatively faster for discouraged unemployment that appears more responsive to changes in most of explanatory variables. Discouraged unemployment is found to reflect reality and suggested to be a more meaningful statistical index.

Application of Prefabricated Retaining Walls with Steel Lagging (강재 요소를 적용한 조립식 흙막이 벽체에 관한 연구)

  • Hong, Jong woo;Choi, Jae Soon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.6
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    • pp.1277-1285
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    • 2015
  • It has been known that the conventional retaining wall system with timber lagging and H pile has several problems such as the irregular gap between H-piles, cutting or adding to standard timber, back fill over first step excavation, and especially break-down accident at the disjoint of wall system. In the practical excavation, these problems may lead to worker's accident and the inefficiency of construction economy. To solve the above problems, a new method using prefabricated retaining wall was proposed and verified. The characteristics of the new method is to replace timber wall as free-sliding steel-lagging and connector. To check its verification and application, laboratory tests such as bending strength, tensile strength, and fatigue strength were carried out. Also, a pilot test in the field and numerical simulations under various ground conditions were performed. From the researches, it is found that the prefabricated retaining wall plate can be superior to the conventional timber lagging plate in the strength. It is also found that the proposed methods can be effective in the reuse of retaining wall plate and safe in the disjoint of wall system. Finally, it is desired that the proposed method will be effective in the reduction of the imported timbers and helpful in the safety of retaining wall construction.

A Study on the AC Pow a Study on the AC Power Control Circuit by Combining PWM and Phase Control (PWM과 입상제어의 조합에 의한 교류전력 제어회로에 관한 연구)

  • 정화균;김이곤;장영학
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.5 no.2
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    • pp.84-95
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    • 1991
  • Mostly, phase control method is used to control the single phase AC power. The phase control method has some advantages such as ease to control and simple configuration. But the retardation of firing angle causes a lagging current even if load is purely resistive. So phase control causes a lagging power factor and a low efficiency at the input side in comparing with the system without switching device. A new PWM control method which can improve these defects for single phase AC power control circuit is proposed in this paper. The performances of the single phase AC power control circuit using the proposed method was investigated theoretically. Both power factor and waveform of load current can be improved better than those of the conventional methods.

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Zero-Current Switching Two-Transformer Phase-Shift Full-Bridge Converter using Voltage Ripple (전압 리플을 이용해 영전류스위칭하는 두개의 트랜스포머를 가지는 위상천이 풀-브릿지 컨버터)

  • Yoon, Hyun-Ki;Moon, Gun-Woo;Youn, Myung-Joong
    • Proceedings of the KIPE Conference
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    • pp.436-438
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    • 2005
  • This paper presents a Zero-Current Switching(ZCS) two-transformer phase-shift full-bridge(TTFB) converter using voltage ripple. The proposed converter provides Zero-Voltage Switching(2VS) of leading leg switches and ZCS of lagging leg switches using volt-age ripple. Especially, circulating current Is reduced by ZCS operation and there are no additional components required for the soft switching of power switches. Furthermore, in case of light load, ZVS operation of lagging leg can be achieved. The operations, analysis and design consideration of proposed converter are presented. To verify the validity of the proposed converter, experimental results for a flow (205V, 2A) prototype are presented.

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