• 농업과학연구
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• 제51권1호
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• pp.63-77
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• 2024

Yield monitoring systems have become integral to precision agriculture, providing insights into the spatial variability of crop yield and playing an important role in modern harvesting technology. This paper aims to review current research trends in yield monitoring systems, specifically designed for non-grain crops, including cabbages, radishes, potatoes, and tomatoes. A systematic literature survey was conducted to evaluate the performance of various monitoring methods for non-grain crop yields. This study also assesses both mass- and volume-based yield monitoring systems to provide precise evaluations of agricultural productivity. Integrating load cell technology enables precise mass flow rate measurements and cumulative weighing, offering an accurate representation of crop yields, and the incorporation of image-based analysis enhances the overall system accuracy by facilitating volumetric flow rate calculations and refined volume estimations. Mass flow methods, including weighing, force impact, and radiometric approaches, have demonstrated impressive results, with some measurement error levels below 5%. Volume flow methods, including paddle wheel and optical methodologies, yielded error levels below 3%. Signal processing and correction measures also play a crucial role in achieving accurate yield estimations. Moreover, the selection of sensing approach, sensor layout, and mounting significantly influence the performance of monitoring systems for specific crops.

• 한국작물학회지
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• 제22권2호
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• pp.59-64
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• 1977

우리나라에서의 소맥 수량성과 품질의 지역성을 파악할 목적으로 9개 품종을 8개 지역에 공시한 국장시험에서 종실수량 및 소맥분의 단백질 함량과 침전가를 검토하여 이들 상호간의 관계를 품종 및 지역별로 검토한 결과는 다음과 같다. 1. 전국적으로 본 종실수량과 m$^2$당 수수는 고도의 정상관$(r=0.53^{**})$을 보였다. 2. 품종별 전국 평균수량에서는 400kg/10a 이상의 품종은 조광, Bezostaya, Kitakamikomugi등 이었고 300~400kg/10a의 품종은 원광, 영광, Roussalka, Centurk등 이었으며 300kg/10a 이하의 품종은 Atlas 66, NE 701132이었다. 3. 지역별 수량에서 청주 이북의 4개소 평균수량은 275kg/10a이었고 유성 이남의 4개소 평균수량은 449 kg/10a로 남부지역에서 높았다. 4. 품종 및 재배지역에 따른 종실내 단백질함량과 침전가는 각각 8.9~12.6%, 32~58cc 및 9.0~11.4%, 38~56cc의 범위에 있었고 일반적으로 북부 재배지역에서 단백질 함량 및 침전가가 높았다. 5. 종실내 단백질 함량과 침전가는 고도의 정의 상관$(r=0.66^{**})$이 있었고 종실수량과 단백질 함량 및 침전가 간에는 각각 $-0.49^{**}$ 및 $0.39^{**}$의 부상관이 있었다. 6. 비침전가는 경질 소맥인 Centurk 및 NE 701132 품종에서 높은 반면 조광, Roussalka등의 연질 품종계열들에서는 낮은 경향을 보여 비침전가는 단백질의 질의 평가와 경연질 소맥분류의 좋은 지표가 되었다. 7. 비침전가에 의한 경연질 소맥의 분류기준은 비침전가 4이하는 연질소맥으로, 5이상은 경질소맥으로 그리고 4~5는 중간질 소맥으로 볼 수 있었다.

• KSBB Journal
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• 제18권4호
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• pp.306-311
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• 2003

융합단백질의 절단을 위해 EK를 고정화하여 액상 절단반응과 같은 80％의 절단수율을 얻을 수 있었다. 그리고 니켈 친화칼럼을 이용하여 간단한 정제공정을 구축하였다. 공유결합한 EK의 경우 니켈친화 결합한 EK보다 높은 재접힘 수율을 나타내었고 풀림과 재접힘을 이용하여 효소의 초기 활성을 회복함에 따라서 반복사용을 통한 경제적인 절단공정을 구축할 수 있게 되었다. 그러나 고정화 과정에서 효소의 활성이 감소하는 문제점과 고정화 수율을 높이기 위한 연구가 필요하다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 춘계학술대회 논문집
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• pp.158-163
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• 2009

Titanium alloy sheets have excellent specific strength and corrosion resistance as well as good performance at high temperature. Recently, titanium alloys are widely employed not only aerospace parts but also bio prothesis and motorcycle. However, due to the low formability and large spring back at room temperature, titanium alloy sheets were usually formed by slow forming or hot forming with heating die and specimen. In the sheet metal forming area, FE simulation technique to optimize forming process is widely used. To achieve high accuracy FE simulation results, Identification of material properties and deformation characteristic such as yield function are very important. In this study, uniaxial tensile and biaxial tensile test of Ti-6Al-4V alloy sheet with thickness of 1.0mm were performed at elevated temperature of 873k. Biaxial tensile tests with cruciform specimen were performed until the specimen was breakdown to characterize the yield locus of Ti-6Al-4V alloy sheet. The experimental results for yield locus are compared with the theoretical predictions based on Von Mises, Hill, Logan-Hosford, and Balat's model. Among these Logan-Hosford's yield criterion well predicts the experimental results.

• Journal of Biosystems Engineering
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• 제30권1호
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• pp.45-55
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• 2005

Knowledge of the relationship between crop yield and yield-limiting factors is essential for precision farming. However, developing this knowledge is not easy because these yield-limiting factors are interrelated and affect crop yield in different ways. In this study, data for grain yield and yield-limiting factors, including crop chlorophyll content, soil chemical properties, and topography were collected for a small (0.3 ha) rice paddy field in Korea and a large (36 ha) upland corn field in the USA, and relationships were investigated with path analysis. Using this approach, the effects of limiting factors on crop yield could be separated into direct effects and indirect effects acting through other factors. Path analysis provided more insight into these complex relationships than did simple correlation or multiple linear regression analysis. Results of correlation analysis for the rice paddy field showed that EC, Ca, and $SiO_2$ had significant (P<0.1) correlations with rice yield, while pH, Ca, Mg, Na, $SiO_2,\;and\;P_2O_5$ had significant correlations with the SPAD chlorophyll reading. Path analysis provided additional information about the importance and contribution paths of soil variables to rice yield and growth. Ca had the highest direct effect (0.52) and indirect effect via Mg (-0.37) on rice yield. The indirect effect of Mg through Ca (0.51) was higher than the direct effect (-0.38). Path analysis also enabled more appropriate selection of important factors limiting crop yield by considering cause-and-effect relationships among predictor and response variables. For example, although pH showed a positive correlation (r=0.35) with SPAD readings, the correlation was mainly due to the indirect positive effects acting through Mg and $SiO_2$, while pH not only showed negative direct effects, but also negatively impacted indirect effects of other variables on SPAD readings. For the large upland Missouri corn field, two topographic factors, elevation and slope, had significant (P<0.1) direct effects on yield and highly significant (P<0.01) correlations with other limiting factors. Based on the correlation analysis alone, P and K were determined to be nutrients that would increase corn yield for this field. With the help of path analysis, however, increases in Mg could also be expected to increase corn yield in this case. In general, path analysis results were consistent with published optimum ranges of nutrients for rice and com production. We conclude that path analysis can be a useful tool to investigate interrelationships between crop yield and yield limiting factors on a site-specific basis.

• 지능정보연구
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• 제9권1호
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• pp.157-177
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• 2003

본 논문은 반도체 FAB공정의 수율개선 및 예측을 위해 데이터마이닝 기법을 적용한 사례를 소개한다. FAB 공정의 복잡성과 생산현장에서 수집되는 방대한 기술데이터로 인해 기존의 통계적 방법이나 엔지니어의 경험적 분석 방법만으로는 미처 파악하지 못하는 수율 저하 요인이 상당 수 존재한다. 본 논문은 먼저, FAB공정을 마친 웨이퍼에 불량 칩(chip)이 지리적으로 특정 위치에 집중적으로 발생하는 현상을 육안검사 대신 군집분석을 이용하여 데이터로부터 자동 판별할 수 있는 방법을 제안한다. 다음으로 연속패턴분석, 분류분석, RBF(Radial Base Function) 기법을 적용하여 수율 저하의 원인이 되는 문제 장비나 문제 파라미터를 신속, 정확하게 파악할 수 있도록 해 줄 뿐만 아니라 공정 진행 중인 제품의 미래 수율을 예측할 수 있도록 지원하는 방법을 제안한다. 또한 위 기법들을 반도체 FAB공정을 대상으로 국내 모 반도체 회사에서 정보시스템으로 구현한 Y2R-PLUS (Yield Rapid Ramp-up, Prediction, analysis ＆ Up Support) 시스템을 소개한다.

• Geomechanics and Engineering
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• 제29권1호
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• pp.1-11
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• 2022

A semi-analytical solution to responses of overconsolidated (OC) unsaturated soils surrounding an expanding spherical cavity under constant suction condition is presented. To capture the elastoplastic hydro-mechanical property of OC unsaturated soils, the unified hardening (UH) model for OC unsaturated soil is adopted in corporation with a soil-water characteristic curve (SWCC) and two suction yield surfaces. Taking the specific volume, radial stress, tangential stress and degree of saturation as the four basic unknowns, the problem investigated is formulated by solving a set of first-order ordinary differential equations with the help of an auxiliary variable and an iterative algorithm. The present solution is validated by comparing with available solution based on the modified Cam Clay (MCC) model. Parametric studies reveal that the hydraulic and mechanical responses of spherical cavity expanding in unsaturated soils are not only coupled, but also affected by suction and overconsolidation ratio (OCR) significantly. More importantly, whether hydraulic yield will occur or not depends only on the initial relationship between suction yield stress and suction. The presented solution can be used for calibration of some insitu tests in OC unsaturated soil.

• Advances in nano research
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• 제14권3호
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• pp.225-234
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• 2023

In this study, we aim to use big data resources and statistical analysis to obtain a reliable instruction to reach high-quality and high yield agricultural yields. In this regard, soil type data, raining and temperature data as well as wheat production in each year are collected for a specific region. Using statistical methodology, the acquired data was cleaned to remove incomplete and defective data. Afterwards, using several classification methods in machine learning we tried to distinguish between different factors and their influence on the final crop yields. Comparing the proposed models' prediction using statistical quantities correlation factor and mean squared error between predicted values of the crop yield and actual values the efficacy of machine learning methods is discussed. The results of the analysis show high accuracy of machine learning methods in the prediction of the crop yields. Moreover, it is indicated that the random forest (RF) classification approach provides best results among other classification methods utilized in this study.

• BMB Reports
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• 제38권1호
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• pp.24-27
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• 2005

The role of 3' exonuclease excision in DNA polymerization was evaluated for primer extension using inert allele specific primers with exonuclease-digestible ddNMP at their 3' termini. Efficient primer extension was observed in amplicons where the inert allele specific primers and their corresponding templates were mismatched. However, no primer-extended products were yielded by matched amplicons with inert primers. As a control, polymerase without proofreading activity failed to yield primer extended products from inert primers regardless of whether the primers and templates were matched or mismatched. These data indicated that activation was undertaken for the inert allele specific primers through mismatch proofreading. Complementary to our previously developed SNP-operated on/off switch, in which DNA polymerization only occurs in matched amplicon, this new mutation detection assay mediated by $exo^+$ DNA polymerases has immediate applications in SNP analysis independently or in combination of the two assays.

• Archives of Pharmacal Research
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• 제25권1호
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• pp.1-10
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• 2002

Attempts to develop drugs, specific for cancer cells, are dealt here according to the intended cell-target. While many target specific drugs were developed, they reach only moderate successes in clinics for reasons, such as, delivery problem, lack of in vivo efficacy or toxicity. However, recent efforts focusing on the diversity of tyrosine kinases, participating in cell-signal transduction, brought fruit. The first such drug, Givec, approved by the USFDA recently, is used in clinics with great success to threat CML. The drug inhibits tyrosin kinase of bcr-abl, c-abl and v-abl. Work is progressing on other tyrosin kinase inhibitors and on other type of specific cancer cell signal protein inhibitors. These efforts are hoped to yield better cures for cancer in the near future.