• 한국잡초학회지
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• 제32권2호
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• pp.139-143
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• 2012

본 연구는 한국잔디로 조성된 잔디밭에서 예초 직후에 prohexadione-calcium을 엽면 처리하여 잔디와 경합하는 클로버의 생장을 억제하는 효과를 구명하기위하여 수행되었다. 클로버의 엽병장과 엽면적은 prohexadione-calcium의 처리로 7주에도 무처리에 비하여 현저하게 억제되었고, 클로버의 생엽중도 무처리에 비하여 현저하게 억제되는 것으로 나타났다. 엽색도는 무처리에 비하여 prohexadione-calcium 처리구가 높아졌고, 처리 농도가 높아질수록 엽색도도 높아지는 것으로 조사되었다. 잔디밭에서 클로버를 방임할 때보다 prohexadione-calcium의 처리는 클로버의 피복율을 현저히 억제할 수 있었다.

• Journal of Plant Biology
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• 제30권2호
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• pp.135-149
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• 1987

An experiment was made in order to analyze the growth characteristics and productivity of Zoysia japonica under control, mowing and TIBA treatment conditions at the experimental farm of Kyung Hee University. The field was planned by the split plot design method and each treatment was given to two plots (40$\times$40 and 100$\times$100 mm) and was replicated three times. Each plot was 9$m^2$ for Zoysia japonica. The sampling of each plot was taken once a week after sowing. In order to know the dry matter of total standing crops, each organ of plants was kept at 9$0^{\circ}C$ and weighed. Total leaf area of a plant was measured by drawing method. The author adopted the growth analysis of English School. Holocellulose analysis by sodium chlorite method was made. The increasing rate of LAI was high in all plots between 10th and 12th week after sowing and high growth rate of assimilatory organ was observed in low density area of TIBA plot. Between 10th and 12th week after sowing all the experimental plots showed high increasing rate of standing crop and in the process of growth each density area of TIBA plot recorded high increasing rate. In all the plots F/C ratio and RGR were high when the growth rate of assimilatory organ was increasing cosiderably, and the higher the planting density was, the higher F/C ratio was recorded. In all the plots NAR recorded maximum rate before the growth period to show a high increase of RGR. In the process of the growth TIBA plot showed high icnreasing rate of NAR. CGR showed high value in high density areas of all the plots and reached its maximum in the 13th week after sowing. Compared to the other experimental areas the low planting density areas of control plot and TIBA plot showed considerable earlier lignification indicating low Holocellulose content in the growth process.

• 한국조경학회지
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• 제28권3호
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• pp.1-12
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• 2000

식물생장조절제(Plant Growth Regulators, PGRs)를 이용한 예초관리 방법이 들잔디 엽색 및 품 질에 미치는 영향을 규명함으로 잔디 적응력 관점에서 적합한 PGR 종류 및 살포수준을 파 악하고자 본 연구를 시작하였다. 실험은 들잔디 생육이 왕성한 시기인 6월(실험 I)과 7월(실험 II) 2회에 걸쳐 각각 다른 장소에서 실시하였다. 공시약제 처리구는 Type I PGR인 amidochlor 3 수준 및 mefluidide 3 수준 과 Type II PGR인 trinexapacethyl 4 수준, 그리고 무처리구를 포함하여 전체 11 처리구였 고, 실험구 배 치는 난괴법 4 반복으로 하였다. 공시한 3종류 PGR 모두 잔디엽색 및 품질에 통계적으로 유의한 차이 가 있었지만, PGR 종류.살포수준 및 생육 상태에 따라 처리효과는 다르게 나타났다. 잔디 엽색 및 품질 은 PGR 살포후 경과기간에 따라 점진적으로 억제되는 경향이었다. 처리 1주후 잔디품질은 대조구에 비 해 큰 차이가 없었지만, 2주에서 4주까지는 PGR 종류 및 살포수준에 따라 유의하게 감소하 여 0.08 ml/ $m^2$ 이상의 trinexapac-ethyl 처리구 및 1.20 ml/$m^2$ 이상의 mefluidide 처리구에서는 가장 크 게 나타났다. 처리 4주부터 대부분 처리구에서 잔디품질이 적정수준 이상으로 회복되기 시작하였다. 본 실험을 통해 잔디관리 수준에서 저관리 잔디지역은 0.08 ml/$m^2$ 수준의 trinexapac-ethyl 처리구가 장기간 생장억제 관점에서 실용성과 경제성 측면에서 들잔디 관리에 효율적인 것으로 판단되었고, 고관리 잔 디지역은 0.04~0.08ml/$m^2$ 수준의 trinexapac-ethyl 처리구 및 0.60~1.20 ml/$m^2$ 수준의 amidochlor 처 리구가 적합 한 것으로 판단되었지만, 계절에 따라 PGR 효과정도가 다르게 나타났다. 따라서, 잔디 관리 시 잔디의 생육상태, 예초 절감 기간, 잔디품질의 기대수준 및 적용할 수 있는 관리수준에 따라 적합한 PGR 종류 선정과 함께 살포시기 및 살포량을 효율적으로 결정하는 것이 필요한 것으로 사료되었다.

• 한국조경학회지
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• 제31권3호
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• pp.91-106
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• 2003

The objective of this study is to present management methods for Korean golf courses to achieve fast green that satisfies international golf tournament standards during an official golf tournament. The results of both the research and the comparative study on putting green management of 24 tournaments hosted in Korea and 12 tournaments hosted in overseas countries in 2002 are as follows: 1. As for the putting greens in Korean and foreign golf courses where official golf tournaments were held, Korean of official golf tournaments were mainly opened in two-green system golf courses contrary to the foreign cases, and the average size of the greens in Korean golf courses was shown to be greater than that of foreign golf courses to some extent, although there was no difference between the types of turf varieties. 2. Results have shown that unlike foreign golf courses, Korean golf courses were managing putting greens by using greens mowers mostly for general (non-tournament) management, and elaborate rolling attempts failed during official tournament flay week because of an insufficient number of rollers to be input. Therefore, Korean golf courses are required to make efforts to secure 21-inch working-behind greens mowers equipped with tournament bedknifes and 11 blades, which is the greens mowing equipment for professional tournaments, and rollers above all things in order to achieve fast green during tournament play week 3. In attempting to achieve green as fast as that of foreign golf courses, Korean golf courses need to consider the method of performing mowing at 3.0mm height or less with greens mowers for professional tournaments. This needs to be done more than two times, followed by a continuous practice of rolling for proper management.

• 아시안잔디학회지
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• 제18권1호
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• pp.37-46
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• 2004

본 연구는 골프코스관리자들이 빠른 그린관리를 위한 장비 사용 계획시 참고가 될 수 있는 기초자료를 제공하고자 그린모아 유형(보행식, 승용식)에 따른 그린스피드 차이, 보행식 그린모아에 장착된 회전날 유형(9날, 11날)에 따른 그린스피드 차이 그리고 롤러 유형(승용식 그린정리기, 경량롤러)에 따른 그린스피드 차이를 비교하였다. 그 결과의 요약은 다음과 같았다. 1. 그린모아 유형(보행식, 승용식)에 따른 그린스피드 차이는 깎기 후 바로 그리고 깎기 후 8시간 경과 뒤에도 보행식 그린모아를 사용한 3.8mm 깎기 처리구가 승용식 그린긴아를 사용한 3.8mm 깎기 처리구에 비해 그린스피드가 빠르게 나타났고 이는 95% 유의수준에서 통계적으로 유의한 결과였다. 따라서 보행식 그린모아가 승용식 그린모아에 비해 빠른 그린 관리에 적합한 장비 유형으로 판단되 었다. 2. 그린모아에 장착된 회전날 유형(9날, 11날)에 따른 그린스피드 차이는 11날 장착 보행식 그린모아를 사용한 3.2mrn 깎기 처리구가 9날 장착 보행식 그린모아를 사용한 3.2mm 깎기 처리구에 비해 그린스피드가 빠르게 나타났고 이는 95% 유의수준에서 통계적으로 유의한 결과였다. 따라서, 11날이 9날보다 빠른 그린관리에 적합한 회전날 유형으로 판단되었다. 3. 보행식 그린모아로 3.0mm로 깎기한 다음이어서 승용식 그린정리기로 1회 롤링한 처리구와 보행식 그린모아로 3.0mm로 깎기한 다음 이어서 경량롤러로 1회 롤링한 처리구간의 그린스피드 차이(다짐후 그린스피드 증가효과)는 95% 유의수준에서 통계적으로 유의하지 못했으나 8시간 경과 뒤에 측정한 두 처리구들의 그린스피드의 차이(다짐후 그린스피드 감소효과)는 95% 유의수준에서 통계적으로 유의한 결과를 나타냈다. 따라서, 경량롤러가 승용식 그린정리기 보다 빠른 그린관리에 적합한 롤러유형으로 판단되었다.

• The Korean Journal of Ecology
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• 제27권4호
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• pp.239-244
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• 2004

In this review, we present the results of our ten years of study on beef cattle production as a means of preserving phytodiversity and landscape in the semi-natural grasslands of the Aso region of Japan. There are about 16,000 ha of semi-natural grasslands in the region. The grasslands are maintained for animal production through such activities as grazing, mowing, and controlled burning. The Shannon's diversity index values, as measured in the present study, were higher in the grazed sites than in the abandoned sites. The grazing activities thus seem to create suitable habitats for coexisting herbaceous species. The grassland grazed moderately over a long term was able to sustain more animals than the grassland unused over a long term.

• 아시안잔디학회지
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• 제15권3호
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• pp.137-146
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• 2001

Stolen and rhizome are used as planting material fur sod production in hybrid types of bermudagrass. The new technology of Leaves and Stems Dressing (LSD) uses leaves and stems collected from mowing for sod production and turf establishment. The procedure of Leaf and Stem Dressing is as follows; 1) Collection of leaves and stems of bermudagrass using rotary mower with bucket. 2) Preparation of turf bed. 3) Dressing of leaves and stems of bermudagrass by man power or spray machine. 4) first irrigation. 5) Topdressing with sand or rotary with tractor. 6) Final irrigation.

• 한국기계가공학회지
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• 제14권3호
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• pp.27-35
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• 2015

Recently, the work machine is widely used in the agricultural machine and to use the power source of the tractor, the mower had been widely used as a working machine for mowing. The mower is classified as a front mower, mid-mower, and rear mower according to the mounting position of the lower frame on tractor. The main structure of mower is composed of deck, gearbox, and blade. This study concerns a study on air flow characteristics of Mid-mower for tractor. An air flow characteristics of the Mid-mower deck was evaluated by the velocity vector, flow path, and total air flow according to the number of revolutions. As the analysis results, The inner path of designed deck had no effect on air flow.

• 한국정밀공학회지
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• 제16권10호
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• pp.203-208
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• 1999

By tilting the reference mirror of Twynman-Green interferometer having a reference mirror and a moving mirror, firinge pattern composed of bright and dark parallel lines can be obtained and the fringe pattern is shifted according to the displacement of the mowing mirror. Several studies are executed for displacement measurement by detecting the intensity of the fringe with photo-diodes having small detecting area. In this study, to improve the sensitivity and robustness, the intensity of fringe is detected by using a large-area quadratic photo-diode masked with a grating panel having four kinds of binary grating having phase-difference of 0, {\pi}$/4, {\pi}$/2, 3 {\pi}$/4. The phase of the fringe is calculated with a simple 4-buckets algorithm. A experimental result shows that standard deviation of 5.653 nm is obtained comparing with a capacitive type gap sensor having nearly 1 nm accuracy.

• Nuclear Engineering and Technology
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• 제28권6호
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• pp.542-550
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• 1996

Nuclear ship reactors have several features different from land-based PWR's. Especially, effects of ship motions on reactor thermal-hydraulics and good load following capability for abrupt load changes are essential characteristics of nuclear ship reactors. This study modified the RETRAN-03 to analyze the thermal-hydraulic transients under three-dimensional ship motions, named RETRAN-03/MOV in order to apply to future marine reactors. First Japanese nuclear ship MUTSU reactor have been analyzed under various ship motions to verify this code. Calculations have been peformed under rolling, heaving and stationary inclination conditions during normal operation. Also, the natural circulation has been analyzed, which can provide the decay heat removal to ensure the passive safety of marine reactors. As results, typical thermal-hydraulic characteristics of marine reactors such as flow rate oscillations and S/G water level oscillations have been successfully simulated at various conditions.