• 한국자원식물학회지
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• 제19권1호
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• pp.130-132
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• 2006

본 실험은 한국잔디의 실생묘 이식재배 시 개간지에서 적정 재식거리를 구명하기 위한 기초 자료를 얻고자 수행하였다. 잔디 실생묘 이식재배시 적정거리를 구명하기 위해 생육특성인 초장, 근장, 분지수, 마디수 및 포복경 길이와 수량구성 요소인 생체중 및 근물중을 조사하였다. 재식거리($30{\times}30cm$)에서, 초장, 근장, 분지수, 마디수 및 포복경 길이가 각각 14.1cm, 22.0cm, 7.0개, 31개 및 77.5cm로, 그리고 생체중 및 건물중이 각각 16.1 and 11.0g/plant로 다른 재식거리와 비교하여 가장 높게 관측되었다. 그러므로 잔디 생육특성과 수량구성 요소를 고려하여, 잔디의 실생묘 이식재배 시 개간지에서 적정 재식거리는 $30{\times}30cm$인 것으로 판단되었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 추계 학술논문 발표대회
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• pp.153-156
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• 2009

This study investigated the fundamental properties corresponding to various length changes on NY fiber reinforced concrete. For results of fresh concrete, the slump and air content were declined, but the unit volume weight and vebe time were increased. For the hardened concrete properties, the compressive strength showed increasing tendency according to the NY fiber length. The dry and autogenous shrinkage also decreased compared with Plain. Generally, the caes that 19 mm NY fiber was used was better than any other cases.

• Plant Resources
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• 제1권1호
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• pp.49-52
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• 1998

This study confirmed that the initiation time of tuberization was well consistent with the cativation time of JA. The consistency was also cinfirmed in the tuberization of yam plants under the altered condition of natural day length. The final yield of JA from 500g fresh leaves was $89.3{\mu}g$.

• The Korean Journal of Ecology
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• 제24권5호
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• pp.309-313
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• 2001

카드뮴 내성 식물을 선별하기 위하여 5종류의 야초류의 카드뮴 내성검정을 실시하였다. 카드뮴 용액에 14일간 노출된 야초류의 발아율, 유식물의 뿌리와 지상부의 생장율, 생체량을 측정하였다. 어저귀와 털비름의 발아율은 모든 농도에서 90%이상으로 나타났으나 자귀풀과 물피, 식용피는 15 mgCdSO₄ /L에 노출되었을 때부터 감소하기 시작했다. 뿌리와 지상부의 길이 생장은 농도가 증가할수록 모두 감소하였으며, 생체량의 경우 물피, 식용피, 털비름은 대조구와 큰 차이를 보이지 않았으나, 어저귀와 자귀풀은 60 mgCdSO₄ /L에 노출되었을 때부터 크게 감소하였다. 또한 어저귀, 자귀풀, 털비름의 EC/sub 50/(Effective Concentration 50%)은 뿌리성장에서는 54 mgCdSO₄ /L, 77.5 mgCdSO₄ /L ,44.5 mgCdSO₄ /L이고, 지상부 성장에서는 114 mgCdSO₄ /L, 73.5 mgCdSO₄ /L, 38.6 mgCdSO₄ /L였으며, 생체량에서는 107.5 mgCdSO₄ /L, 67.5 mgCdSO₄ /L, 60 mgCdSO₄ /L였다. 야초류 간의 카드뮴에 대한 sensitivity는 뿌리 > 생체량 > 지상부 순으로 나타났다. 이러한 결과는 어저귀가 카드뮴에 대한 내성을 가지고 있음을 나타낸다.

• 한국자원식물학회지
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• 제6권2호
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• pp.147-154
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• 1993

The experiment was carried out to study the influence of seeding dates, planting densities and fertilizer application levels on some agronmic characters and yield of fresh weight in Agastache rugosa. The results obtained are summarized as follow; Fresh weight was increased on Apr. 1 seeding date. Therefore, optimum time for sowing was on Apr. 1. Stem length was long in dense planting and short in spacious planting. Stem diameter was thick in spacious planting, and was thin in dense planting. Yield was higher in dense planting densities($10{\times}20cm:50\;plants/m^2,\;20{\times}20cm:25\;plants/m^2,\;(30{\times}20cm:17\;plants/m^2$) Fertilizing ($N:P_2O_5;K_2O=6:6:6kg/10a$) was increased than without fertilizing because stem length and number of leaf were good.

• 아시안잔디학회지
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• 제5권1호
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• pp.23-32
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• 1991

The purpose of this study was to determine the vegetative growth of two cool season turfgrasses during summer season in Korea. Ten respective cultivars of Kentucky bluegrass [Poapratensis L.] and perennial ryegrass [Lolium perenne L.] were exposed to unshaded, 30% and 60% shade for 4odays. First mowing height was 7cm, and then clippings were harvested every ten days at the same height. Shading increased the total length of clippings of all cultivars of two turfgrasses, but fresh and dry weight were significantly decreased. The highest shoot length obtained at 30% shade in Kentucky bluegrass and at 60% shade in perennial ryegrass. 'Rugky', 'Sydsport', 'Wabash' and 'Baron' of Kentucky bluegrass and 'Repel', 'Omega II', 'Ovation', 'Linn', 'Bell' and 'Manhattan' of perennial ryegrass showed relatively high tolerance to shade. Especially, in 'Citation II' perennial ryegrass, fresh and dry weight were increased by 30% shade. The number of tillers generally decreased with increasing shade. In 30% shade, 'Midnight' Kentucky bluegrass and 'Omega II' perennial ryegrass were least reduced and 'Baron' Kentucky bluegrass and 'Pennant' perennial ryegrass were most reduced. The cultivars of lower growth habit in full sunlight showed shade tolerance compared to those of higher growth habit.

• Journal of Ginseng Research
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• 제42권2호
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• pp.208-217
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• 2018

Background: The quality differences in seedlings of medicinal herbs often affect the quality of medicinal parts. The establishment of the grading standard of Panax notoginseng seedlings is significant for the stable quality of medicinal parts of P. notoginseng. Methods: To establish the grading standard of P. notoginseng seedlings, a total of 36,000 P. notoginseng seedlings were collected from 30 producing areas, of which the fresh weight, root length, root diameter, bud length, bud diameter, and rootlet number were measured. The K-means clustering method was applied to grade seedlings and establish the grading standard. Results: The fresh weight and rootlet number of P. notoginseng seedlings were determined as the final indices of grading. P. notoginseng seedlings from different regions of Yunnan could be preliminarily classified into four grades: the special grade, the premium grade, the standard grade, and culled seedlings. Conclusion: The grading standard was proven to be reasonable according to the agronomic characters, emergence rate, and photosynthetic efficiency of seedlings after transplantation, and the yields and contents of active constituents of the medicinal parts from different grades of seedlings.

• Fisheries and Aquatic Sciences
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• 제11권3호
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• pp.133-139
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• 2008

Molecular techniques, including restriction fragment length polymorphism(RFLP) and polymerase chain reaction-single strand conformational polymorph isms(PCR-SSCP), were developed to identify salted, dried threadfin(Eleutheronema tetradactylum) and white herring(Ilisha elongata) fish. Using PCR with universal primers, conserved 367-bp fragments of the cytochrome b gene were amplified from fresh fish samples and sequenced. The sequences were then searched for specific restriction sites. The digestion of the PCR products with the endonucleases AvaI, FokI, MboII, and MspI generated RFLP, which was used to identify the commercial products. Similarly, the amplified PCR-SSCP products were developed and the products tested. Overall, similar patterns were found in the majority of the fresh and processed products. Based on the results, both RFLP and PCR-SSCP were useful in determining and validating the authenticity of the fish species used to prepare the commercial salted, dried products. A similar approach can be applied to other species.

• 선박안전
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• 통권25호
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• pp.64-76
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• 2008

This paper describes the failure mechanism and Charpy impact test of Fiber glass Reinforced Plastic composites which it was actually used for side plate of vessel. There are two examinations. The examination I, the specimens which it given temperature range $-25^{\circ}C$-$50^{\circ}C$ and with different initial notch length did impact test and then it compared impact energy(Uc) and impact fracture toughness(GIC). The examination II, the specimens which it putted into fresh water and sea water for scheduled hours did impact test and it compared impact energy(Uc) and impact fracture toughness(GIC). From examination I, it showed that impact energy(Uc) and impact fracture toughness(GIC) were peak at ambient temperature and decrease as temperature reduced. Fracture toughness(GIC) showed increase as initial notch length reduced. From examination II, impact energy(Uc) and impact fracture toughness(GIC) tended to increase which specimens putted in fresh water compared with sea water and maximum tolerance rate tend to decrease as permeation hours will be long.

• 한국약용작물학회지
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• 제23권4호
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• pp.271-276
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• 2015

This study was conducted to investigate the effect of shading degree and rooting media on the growth of Caragana sinica and Sedum middendorffianum after cutting. In C. sinica, the highest rooting rate was obtained in cuttings planted in horticultural soil (Sunshine Mix #1) and peat moss mixture (peat moss : perlite = 1 : 1, v/v) under one layer of 35% shading and in cuttings planted in kanumatsuchi soil mixture (kanumatsuchi soil : decomposition of granite = 1 : 1, v/v) under non-shading. Whereas, regardless of shading degree, most cuttings of S. middendorffianum rooted in both horticultural soil and peat moss mixture. Cuttings of C. sinica showed the highest root length, 10.4cm in kanumatsuchi soil mixture under one layer of 35% shading but the highest fresh and dry weight of roots in kanumatsuchi soil mixture under non-shading. In S. middendorffianum, the highest root length, fresh and dry weight of root were obtained in cuttings planted in horticultural soil under non-shading. With these results, we recommended that cuttings of C. sinica should be propagated in kanumatsuchi soil mixture under non-shading and cuttings of S. middendorffianum in horticultural soil under non-shading.