• Asian-Australasian Journal of Animal Sciences
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• 제15권12호
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• pp.1813-1821
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• 2002

The aim of this study was to identify useful secondary traits for estimating genetic ability of milk production traits. We investigated the value of using plasma metabolites concentrations. Two hundred and nineteen cattle out of 271 had only milk production traits records (G1), 33 had only metabolites records (G2), and 19 had both milk production traits and metabolites records (G3). Fifty two calves with metabolites records (G2 and G3) were born from 1992 to 1997. Forty three calves (29 females, 14 males) were used from 10 to 90 d of age and the others (3 females, 6 males) from 10 to 60 d of age. A total of 566 records of milk yield, fat yield and protein yield for 240 to 305 d on 238 heads (G1 and G2) were collected The collected blood samples were divided into three age groups: AG1, 10 to 30 d; AG2, 40 to 60 d; and AG3, 70 to 90 d. Heritabilities of milk yield, fat yield and protein yield were $0.45{\pm}0.04$, $0.50{\pm}0.04$ and $0.38{\pm}0.04$, respectively. Heritability of plasma glucose concentration at AG1 was $0.45{\pm}0.08$. Genetic correlations between plasma glucose concentration and milk yield, fat yield and protein yield were -$0.35{\pm}0.28$, $0.64{\pm}0.24$ and $0.36{\pm}0.35$, respectively. When the plasma glucose concentration at AG1 was used to estimate genetic ability of these milk production traits, reliability of milk yield of animals without milk record increased 8.2%, fat yield increased 24.2% and protein yield increased 9.5%. Heritability of plasma total cholesterol concentration at AG3 was $0.83{\pm}0.04$. Genetic correlation between plasma total cholesterol concentration and milk yield, fat yield and protein yield were $0.58{\pm}0.21$, $0.42{\pm}0.20$ and $0.45{\pm}0.22$, respectively. When the plasma total cholesterol concentration at AG3 was using to estimate genetic ability of these milk production traits, reliability of milk yield of animals without milk record increased 19.0%, fat yield increased 9.6%, and protein yield increased 13.5%. The annual genetic gain is in proportion to the reliability of selection. These results show that the plasma metabolite concentrations would be useful for improvement of genetic ability for milk production traits in the genetic improvement in herd of cows, where half of the animals selected are from a herd without its own milk record.

• Spatial Information Research
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• 제13권1호
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• pp.79-90
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• 2005

본 연구는 고랭지 경작지로부터 발생하는 토양유실을 정량적으로 추정하는 것을 목적으로 한다. 강원도 내린천 유역을 대상으로 고랭지 경작지에서 발생하는 연간토양 유실량과 이 토양유실량 중 하천에 도달하는 양을 나타내는 유사량을 추정하였다. 연간토양유실량은 RUSLE 공식을 이용하여 추정하였으며, 유사량은 SEDD 모형을 이용하여 산정하였다. 연구결과 대상지역의 $2.6\%$ 면적을 차지하고 있는 밭이 연간 유역 내에서 발생하는 총토양유실량과 유사량에 대하여 각각 $10.9\%$ 및 $33.12\%$의 비율을 차지하고 있는 것으로 나타났다 또한 고도 400m 이상에 해당하는 고랭지 경작지의 경우 유역 내에서 총 $1.74\%$의 면적을 차지하고 있으나, 연간 총 토양유실량과 유사량에 대해서는 면적에 비하여 월등히 큰 $7.69\%$와 $15\%$의 기여를 하고 있는 것으로 분석되었다. 이상의 결과로부터 내린천 유역의 밭 경작지 특히, 고랭지 경작지에서의 토양유실과 유사량 발생이 다른 토지용도에 비하여 매우 심하게 나타나고 있음을 확인할 수 있었다. 따라서 고랭지 경자지로부터의 토양유실 방지대책이 시급히 마련되어야 할 것으로 생각된다.

• 한국농공학회지
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• 제39권1호
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• pp.93-101
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• 1997

This paper presents yield surfaces and hardening laws for describing the state of an unsaturated soil under isotropic compression and suction changes. The yield surface is formulated within the framework of hardening plasticity using two independent sets of stress variables : the excess of total stress over air pressure and the suction. And the application of the yield surfaces and hardening laws are confirmed from the result of the experiment. To this end a series of suction-controlled isotropic tests are conducted on clayey soils. Matric suction is controlled by the axis translation technique using high air entry ceramic disk. The specimens are compacted using a half of Proctor compaction energy with 5 % lower of water content than the optimum moisture contents. From test results, existence of the yield surfaces and an application of hardening laws to samples are confirmed by comparison between test and predicted results. And it is confirmed that LC yield locus is extened with the total plastic deformations induced by suction or stress changes, however, SI yield locus is only extended with the plastic deformations by induced suction changes.

• 한국환경과학회지
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• 제7권4호
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• pp.451-460
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• 1998

The objectives of this study Is to evaluate the total runoff yield, peak flow and peak flow travel time depending on the urbanization, return period and rainfall patterns at the downstream of Manchon urban watershed in TaeGu City. SWM(Storm Water Management Model) is used for runog analysis based on 5 different steps of urbanization and 4 different types of Hufrs quartile according to 8 return periods. It is analyzed that the order of total runoff yield according to raiun patterns is Huffs 4, Huffs 2. Huffs 3 and Huffs 1 quartile, that of peak flow magnitude is Huffs 2, Huffs 1, Huffs 4 and Huffs 3 quartile at present development ratio. under the 60, 70, 80 and 90ft of urbanization to the 50% of urbanization by means of the rainfall patterns, the mean Increasing ratio of total runoff yield for each case is 4.55, 11.43, 16.07 and 20.02%, that of peak flow is 5.82, 13.61, 17.15 and 18.83%, the mean decreasing ratio of peak flow travel time Is 0.00, 2.44, 5.07 and 6.26%, the mean increasing ratio of runoff depth Is 4.51, 11.42, 16.02 and 20.05% respectively. the mean increasing ratio of total runoff yield by means of each and 19.71%. Therefore, as the result of this study. it can be used for principal data as to storm sewage treatment and flood damage protection planning in urban small watershed.

• Plant Breeding and Biotechnology
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• 제6권4호
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• pp.454-462
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• 2018

Yield and grade are the key factors that affect production value of peanut. The objective of this study was to identify QTLs for pod yield, hundred-seed weight, and total sound mature kernel (TSMK). A total of 90 recombinant inbred lines, derived from Tamrun OL07 and a breeding line Tx964117, were used as a mapping population and planted in Brownfield and Stephenville, Texas. A genetic map was developed using 1,211 SNP markers based on double digest restriction-site associated DNA sequencing (ddRAD-seq). A total of 10 QTLs were identified above the permutation threshold, three for yield, three for hundred-seed weight and four for TSMK, with LOD score values of 3.7 - 6.9 and phenotypic variance explained of 12.2% - 35.9%. Among those, there were several QTLs that were detected in more than one field experiment. The commonly detected QTLs in this study may be used as potential targets for future breeding program to incorporate yield and grade related traits through molecular breeding.

• 한국유기농업학회지
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• 제4권2호
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• pp.79-85
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• 1995

This experiment was carried out to broadcating effect of chitosan solution levels on dry matter production in Ladino clover(Trifolium repens). Chitosan solution was applie at 6 levels, 0%, 0.01%, 0.05%, 0.1%, 0.5% and 1.0%, respectively. The results obtained were summarized as follows ; 1. The dry matter yields of chitosan treatment plot were about 30%~63% more than the dry matter yield of control plot in all cuts. 2. Total dry matter yield was produced by 659.7kg/10a at levels of 0.05%, it was significantly higher than other chitosan solution levels. 3. The predictable highest yield and economic yield of Ladino clover could be obtained at 0.05% and 0.01% solution levels, respectively. 4. The relative dry matter yields for total dry matter yield were 66.7%, 18.3% and 15.0% at 1st, 2nd and 3rd cut, respectively. Chitosan application at early spring was affected to increasing the dry matter yield of 1st cut.

• 공업화학
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• 제29권3호
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• pp.325-329
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• 2018

본 연구에서는 항산화성분함량이 높다고 알려진 안젤리카를 이용하여 폴리페놀을 추출하고 반응표면분석법을 이용하여 추출과정을 최적화하였다. 반응표면분석법의 반응치로는 추출수율과 폴리페놀함량을 설정하였고, 추출공정의 계량인자로는 추출시간, 주정/초순수 부피비, 추출온도를 이용하였다. 추출수율과 폴리페놀함량 모두 계량인자의 주효과도와 교호효과도를 모두 고려하였을 때 가장 큰 영향을 미치는 인자는 추출시간이었다. 또한 반응표면분석 결과 안젤리카의 최적추출조건은 추출시간이 2.8 h, 주정/초순수 부피비 64.0 vol%, 추출온도 $56.6^{\circ}C$로 나타났다. 이 조건의 추출수율은 24.6%, 폴리페놀함량은 8.76 mg GAE/g으로 산출되었다. 추출수율과 폴리페놀함량에 대한 회귀방정식의 결정계수 $R^2$은 각각 81.4%와 75.4%이었으며, 종합 만족도는 D = 0.80, 유의성은 5% 이내의 수준에서 인정되었다.

• 한국초지조사료학회지
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• 제20권4호
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• pp.285-294
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• 2000

To investigate the effect of Mycorrhiza (Glomus intradics) and Rhizobium inoculation on the N, P utilization and growth response of Alfalfa (Medicago saliva L.) and Perennial ryegrass (Lolium perenne L.) in mixed sward, four treatments (non-inoculation, Control; Mycorrhiza inoculation: M; Rhizobium inoculation, R and Mycorrhiza and Rhizobium inoculation, M+R) were applied. The associated analyses were canied out on the early vegetative growth stage (DAS 56, 56 days after seeding) and on the early flowering stage (DAS 126). The decreased rate of total N and P content in soil, with advancing plant growth, was relatively higher in the M and M + R treatment than control. The content of availabie phosphorus in soil at DAS 126 increased by about 34 and 38 % in M and M+R treatment compared to control (189.2 mg PzOskg DM), while non-significant changes was observed in R treatment. Total N uptake and P uptake in the control at DAS 126 were 44.71 and 3.52 mglplant in mixed sward, respectively. About 71, 98 and 197 % of increases in total N uptake and 70, 72 and 11 1 % of increases in total P uptake were estimated in M, R and M+R treatment. Comparing to control, total dry matter yield significantly increased by 27, 33 and 53 %, and crude protein yield also by 78, 83 and 204 %, respectively, in M, R and M+R treatment. The present data indicated that mycorrhiza orland rhizobium inoculation improved N, P utilization of both alfalfa and perennial ryegrass plants, and consequently increased total yield (especially by dual inoculation, M+R). (Key words : Alfalfa, Perennial ryegrass, Mycorrhiza, Rhizobium, N and P Utilization, Growth, Yield)

• 생물환경조절학회지
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• 제19권4호
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• pp.392-396
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• 2010

본 연구는 하이부쉬 블루베리(Vaccinium corymbosum) 'Jersey' 품종을 이용하여 적방 1/3, 적방 1/3 +적화 1/2, 적방 2/3 및 적방 2/3 + 적화 1/2처리 후 무처리 과실의 수확량과 과실 품질을 조사하여 적방 적화 정도에 따른 수량과 과실 크기, 가용성당함량, 산함량, 과실 경도를 분석하였다. 적방 적화 처리는 과립중, 종경 및 횡경에 유의한 과립 비대효과를 가져왔다. 과실 수확량은 무처리와 적방 1/3 처리구에서 가장 높았으며, 그 이외의 처리에서는 과립비대는 이루어졌으나 수확량의 감소가 발생하였다. 무처리와 적방 1/3 처리의 경우 전체 수확량은 비슷하였으나, 적방 1/3 처리구에서는 상품성이 큰 대립의 과실이 차지하는 비율이 무처리에 비해서 큰 것으로 조사되었다. 가용성당함량은 적방과 적화 처리에 따라 수량이 감소한 적방 2/3, 적방 2/3 + 적화 1/2 처리구에서 유의하게 증가하였으나, 산함량과 경도에는 영향을 미치지 않았다. 적방 적화에 따른 영향은 과립 비대와 수량에 유의한 차이를 주었으나 과실품질에는 크게 영향을 미치지 않는 것으로 조사되었다.

• Geomechanics and Engineering
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• 제13권4호
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• pp.585-600
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• 2017

This study deals with simple solutions for a spherical or circular opening excavated in elastic-brittle plastic rock mass compatible with a linear Mohr-Coulomb (M-C) or a nonlinear Hoek-Brown (H-B) yield criterion. Based on total strain approach, the closed-form solutions of stresses and displacement are derived simultaneously for circular and spherical openings using original H-B and M-C yield criteria. Two simple numerical procedures are proposed for the solution of generalized H-B and M-C yield criteria. Based on incremental approach, the similarity solution is derived for circular and spherical openings using generalized H-B and M-C yield criteria. The classical Runge-Kutta method is used to integrate the first-order ordinary differential equations. Using three data sets for M-C and H-B models, the results of the radial displacements, the spreading of the plastic radius with decreasing pressure, and the radial and circumferential stresses in the plastic region are compared. Excellent agreement among the solutions is obtained for all cases of spherical and circular openings. The importance of the use of proper initial values in the similarity solution is discussed.