• 한국작물학회지
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• 제52권2호
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• pp.134-139
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• 2007

The research was conducted with the aim of determining effects of seedling age on the yield of four fine rice varieties viz., Kalizura, Tulshimala, BRRI (Bang-ladesh Rice Research Institute)-37 and BRRI-38. The seedling of different ages such as 15, 25, 35 and 45 days were transplanted on the same day maintaining $25cm{\times}15cm$ spacing. The experiment was laid out in a randomized complete block design with three replications. The yield and yield contributing characters were influenced by seedling age, variety and their interaction. BRRI-38 gave the highest number of effective tillers $hill^{-1}$, panicle length, total spikelets $panicle^{-1}$, grains $panicle^{-1}$, 1000-grains weight and grain yield. Likewise, yield and yield contributing characters were the highest in 35 days old seedling. On the other hand, the variety (BRRI-38) with the same age as of seedlings 35 days old seedlings was found superior to other interactions, but, in the production of grains $panicle^{-1}$ and 1000-grains weight there was no significant effect in this interaction. From the findings it may be inferred that BRRI-38 with 35 days old seedlings produced the highest grain yield.

• Journal of Microbiology and Biotechnology
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• 제30권8호
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• pp.1116-1123
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• 2020

Velvet antler (VA) is a historically traditional medicinal supplement and is well known in Asian countries for its pharmaceutical and health benefits. The objectives for this study were to optimize the hot water extraction (HWE) of VA for the Korean VA industry, and to determine the most effective pretreatment method among microwave (MW), ultrasonication (US), and enzymatic (EZ) techniques. Using response surface methodology, optimum extraction temperatures and times were determined by central composite design configuration based on extraction yield and sialic acid content. Various quality parameters of VA extract including yield, soluble solid, protein, and sialic acid contents were also compared with the conjunction of HWE and pretreatment. The yield and sialic acid content of VA extract were determined to be 40% and 0.73 mg/g, respectively, under an optimum temperature of 100℃ at 24 h of extraction time. The yields from VA extracts pretreated with MW, US, and EZ were 17.42%, 19.73%, and 29.15%, respectively. Among the tested commercial enzymes, pepsin was the most effective proteolytic enzyme and led to the highest yield (47.65%), soluble solids (4.03 °brix), protein (1.12 mg/ml), and sialic acid (3.04 mg/ml) contents from VA extract.

• Computers and Concrete
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• 제2권2호
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• pp.97-110
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• 2005

Rheological behaviour of fresh concrete is an important factor in controlling concrete quality. It is recognized that the measurement of the slump is not a sufficient test method to adequately characterize the rheology of fresh concrete. To further understand the slump measurement and its relationship to the rheological properties, an elasto-viscoplastic, 2-D axisymmetric finite element (FE) model is developed. The FE model employs the Bingham material model to simulate the flow of a slump test. An experimental program is carried out using the Slump Rate Machine (SLRM_II) to evaluate the finite element simulation results. The simulated slump-versus-time curves are found to be in good agreement with the measured data. A sensitivity study is performed to evaluate the effects of yield stress, plastic viscosity and cone withdrawal rate on the measured flow curve using the FE model. The results demonstrate that the computed yield stress compares well with reported experimental data. The flow behaviour is shown to be influenced by the yield stress, plastic viscosity and the cone withdrawal rate. Further, it is found that the value of the apparent plastic viscosity is different from the true viscosity, with the difference depending on the cone withdrawal rate. It is also confirmed that the value of the final slump is most influenced by the yield stress.

• 수산해양교육연구
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• 제16권1호
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• pp.84-98
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• 2004

Due to a publicly owned resources, the overexploitation of the fisheries resources can result in externalities in the form of reduced future levels of yield. These problems can be theoretically improved through effective management of the fishery. The paper illustrates maximum sustainable yield(MSY), maximum economic yield(MEY) and F0.1 level of fishing mortality as the concept of optimal yield, and it theoretically shows that MSY is more appropriate for the optimal yield than MEY where prices increase even though MEY achieves the maximization of economic rent in a fishery assuming constant prices. And the paper presents several fisheries management tools and policies such as input controls, output controls and taxes. As the traditional approach to fishery management, input controls involve restrictions on the physical inputs into the production process(e.g. capital, time or technology) and output controls involve limits on the quantity of fish that can be landed. To introduce user cost into the harvest decisions of rent-seeking fishers, taxation, as a bioeconomic management policy of the fisheries, directly addresses the problems associated with the resource being unpriced. As most fisheries management plans, however, have increasing fisher income as an objective, taxes have not been introduced into any fisheries management policies despite their theoretical attraction.

• 한국토양비료학회지
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• 제22권4호
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• pp.315-322
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• 1989

작약(芍藥)을 관행(慣行), 유기(有機), 무기(無機), 유기(有機)-무기(無機) 혼용구(混用區) 및 유기(有機) 무기증비구(無機增肥區)를 설정(設定)하여 생육(生育) 및 수량(收量), 유효성분함양(有效成分含量)을 조사(調査)한 결과(結果) 다음과 같은 결논(結論)을 얻었다. 1. 지상부(地上部)의 생육(生育)에는 각(各) 처리구간(處理區間)에 큰 차리(差異)는 없었으며, 수량(收量)에 있어서는 유기(有機)-무기(無機) 혼용구(混用區)에서 유의성(有意性)이 인정(認定)되었다. 2. 작약근중(芍藥根中) 유효성분(有效成分)인 paeoniflorin, albiflorin, Oxypaeoniflorin 함량(含量)의 년차간(年次間) 변화(變化)는 생육기간(生育期間)이 증가(增加)함에 따라 현저(顯著)히 증가(增加)하는 경향(傾向)을 보였으며 Benzoic acid는 감소(減少)하는 경향(傾向)이었다. 3. 관행구(慣行區)의 수양(收量) 및 약효성분(藥效成分)의 감소경향(減少傾向)이 있으므로 린산비료(燐酸肥料)의 적양시비(適量施肥)에 대(對)한 재검토(再檢討)가 요구(要求)된다. 4. 1차(次) 및 2차(次) 재배시험(栽培試驗)의 1년차(年次)와 2년차(年次)의 수양(收量)과 유효성분(有效成分)을 종합비교(綜合比較)해 볼 때, 무기질비료(無機質肥料)만을 시비(施肥)한 것보다는 유기질비료(有機質肥料)만을 시용(施用)하여 재배(栽培)했을 때 양호(良好)했으며, 유기(有機)-무기질(無機質) 비료(肥料)를 혼용(混用)하면서 무기비료(無機肥料)를 50%, 100% 증비(增肥)했을 때 유기구(有機區)보다 수량(收量)과 유효성분(有效成分)의 증가경향(增加傾向)을 보였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.430-433
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• 2005

In this study, weight of evidence(WOE) technique based on the bayesian method was applied to estimate the groundwater yield characteristics in the Pocheon area in Kyungki-do. The ground water preservation depends on many hydrogeologic factors that include hydrologic data, landuse data, topographic data, geological map and other natural materials, even with man-made things. All these data can be digitally collected and managed by GIS database. In the applied technique of WOE, The prior probabilities were estimated as the factors that affect the yield on lineament, geology, drainage pattern or river system density, landuse and soil. We calculated the value of the Weight W+, W- of each factor and estimated the contrast value of it. Results by the ground water yield characteristic calculations were presented in the form of posterior probability map to the consideration of in-situ samples. It is concluded that this technique is regarded as one of the effective technique for the feasibility mapping related to detection of groundwater bearing zones and its spatial pattern.

• Computers and Concrete
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• 제12권6호
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• pp.819-829
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• 2013

The objective of this study is to determine whether or not the yield line theory, an effective method widely used for slabs made of ordinary concrete, can be used also for the reinforced concrete slabs made of high-strength concrete. Flexural behavior of simply supported slabs in three different sizes were investigated under concentrated load at mid-span. Additionally, behavior of high strength reinforced concrete slabs with 50 mm and 150 mm reinforcement spacings also studied. Failure loads, deflections, experimental and theoretical failure mechanisms were evaluated. The difference between the moments based on yield line theory and experimental moments varied between 1% to 3%. Experimental and analysis results revealed that yield line analysis could conveniently be employed in the analysis of high strength reinforced concrete slabs.

• 전자공학회논문지A
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• 제33A권6호
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• pp.189-196
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• 1996

We have studied sngle-frequency yield of 1.55${\mu}$m DFB lasers with uniform sinusoidal grating using an effective index transfer matrix method considering both threshold gain difference and spatial hole-burning effect. Optimum grating height and mirror reflectivities that maximize the single-frequency yield are found for a low-reflection (LR)/high-reflection(HR) mirror structure and a LR/as-cleaved miror structure for an assumed basic waveguide structure. LR/HR structure has a high yield of about 80% in a narrow range of grating height while LR/as-cleaved mirror structure has a low yield of about 50% in a relatively wide range of grating height. The effect of the low-reflection facet reflectivity is also studied.

• International Journal of Quality Innovation
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• 제10권1호
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• pp.1-23
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• 2009

Face the process yield rate improvements of motherboard, although general enterprises finish deployment goal of each functions by overall quality managements, through quality improvement methods, industry engineering methods, plan-do-check-act (PDCA) methods and other improvement solutions, but it is only can be improved partially and unable to enhance the yield rate of product to the target. It only can takes one step ahead to enhance the process yield rate of motherboard with six sigma ($6{\sigma}$) overall DMAIC process and tactics. This research aimed to use six sigma quality improvement tactics by DMAIC systematic procedure and tactics, and find the key factors that effect to the process yield rate of surface mount technology. It also identified the keys input and process and output index to satisfy customer requirements and internal process index. The results showed that the major effective factors by fishbone and process failure modes and effects analysis (PFMEA). If the index of input and output that can be quantified, the optimum parameter can be found through design of experiment to ensure that the process is stable. If the factor of input and output that cannot be quantified, we found out the effective countermeasure by Mind_Mapping, make sure whole processes can be controlled stably, to reach the high product quality and enhance the customer satisfaction.

• 한국작물학회지
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• 제29권3호
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• pp.285-290
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• 1984

대두에 왜화제인 B 995와 CCC를 살포시기별(본엽 4, 5, 6 매), 농도별 (500, 1000, 2000, 3000 ppm)로 엽면살포하여 생육 및 수량에 미치는 영향을 구명하고자 본 실험을 수행하여 얻어진 주요결과는 다음과 같다. 1. 약제별로는 경장에서만, 살포시기별로는 결협율에만, 그리고 농도별로는 경장, 분지수, 결협율, 주당협수와 수량에서만 유의성이 인정되었다. 2. 견장의 단축은 CCC보다는 B 995가 더 효과적이었으며 결협율은 본엽4 매시의 살포에서 가장 높았다. 3.농도별효과를 보면 저농도보다는 고농도인 3,000ppm에서 경장의 단축, 분지수, 결협율 그리고 주당협수의 증가와 수량의 증대를 나타냈다. 4. 주경절수, 경건중, 엽록소와 100입중은 약제살포시기 및 농도별로 유의성이 없었다. 5. 수량은 경장과는 부의 상관이었고 분지수, 주당협수, 결협율과는 정의 상관이었다. 6. 왜화제의 엽면살포는 주요수량구성 요소증대에 상당히 효과적이었다.