• Journal of Animal Science and Technology
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• 제50권5호
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• pp.591-600
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• 2008

본 연구는 암소의 산유량, 송아지의 생시 체중, 3개월령 체중 및 포유기 일당증체량들 간의 상관관계를 규명하기 위하여 실시하였다. 분석에 이용된 자료는 축산기술연구소 대관령지소(현 축산과학원 한우시험장)에서 2002년 6월부터 11월 사이에 128쌍 그리고 2003년 4월부터 11월 사이에 94쌍 등 총 222쌍의 암소와 포유중인 송아지로부터 조사하였는데 조사된 형질 중 암소의 산유량은 포유전후 체중차를 이용하여 추정하였다. 조사된 형질들은 모두 어미소 형질로 간주하여 분석을 하였는데 유전모수 추정은 A-I REML(average information restricted maximum likelihood) 추정치를 제공하는 Meyer(2006)의 WOMBAT package를 이용하여 실시하였다. 일일 산유량과 24시간 보정 산유량의 유전력은 각각 0.39와 0.36으로 두 추정치 간에 차이가 없었다. 어미소 형질로 간주하여 추정한 송아지의 생시체중, 3개월령 체중 및 포유기 일당증체량에 대한 유전력은 각각 0.28, 0.17 및 0.18로서 생시체중의 유전력은 3개월령 체중이나 포유기 일당증체량의 유전력에 비해 약간 큰 편이었으며 3개월령 체중과 포유기 일당증체량 간에는 유전력의 크기에서 차이가 없었다. 일일 산유량은 생시체중, 3개월령 체중 및 포유기 일당증체량에 대한 모체 효과 들과의 유전 상관계수가 각각 0.59, 0.79 및 0.68이었다. 일일산유량이 3개월령 체중이나 포유기 일당증체량의 모체효과 간에 높은 유전상관 관계가 있는 것으로 나타난 결과에 근거할 때 한우 집단에서 송아지의 포유기 일당증체량 또는 3개월령 체중의 모체 유전 효과에 대한 선발을 통해 암소들의 산유량에 대한 유전적 개량을 실현할 수 있을 것으로 판단된다.

• 한국의료질향상학회지
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• 제21권1호
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• pp.80-95
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• 2015

Objectives : A safety culture is the bedrock for all patient safety improvement initiatives; thus, many resources have been invested in measuring hospital culture. However, many of these endeavors have failed to yield meaningful results. This article proposes a practical checklist to ensure successful administration of a safety culture survey and describes current methodologies for analyzing survey results to develop safety improvement programs. Methods : We reviewed currently used safety culture surveys and summarized their strengths and weaknesses. We also reviewed studies using safety culture surveys and found several pitfalls leading to failure in survey administration. With this information, we developed a checklist that covers critical items in the survey process. We also reviewed newly developed methodologies for survey results analysis and application and described them using the Korean version of the Safety Attitudes Questionnaire as an example. Results : The checklist consists of three steps: survey preparation, administration, and analysis and application. Each step contains clear action items. The content even describes how to get buy-in from hospital executives and manage communication channels with them. Also, common misunderstandings regarding survey scores are described and possible solutions are suggested. In the analysis section, we demonstrate new methods for obtaining more accurate survey results and how to utilize these methods to develop and implement hospital-wide safety improvement programs. Conclusion : A successful safety culture survey is the foundation of all future safety improvement projects. This review is intended to guide hospitals in enhancing safety.

• 한국토양비료학회지
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• 제28권3호
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• pp.256-260
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• 1995

신개간지인 송정양토(松汀壤土)에서 토양 개량방법별로 경제성 있는 작물을 선발하기 위하여 1985년부터 4년간(年間) 대조구, 퇴비구, 심경구, 인산구, 석회구, 종합개량구등 6개 처리를 하여 옥수수, 콩, 율무, 고구마를 재배하면서 작물 수량과 토양 특성 변화를 조사한 결과는 다음과 같다. 토양의 孔隙率은 고구마구의 공극율이 가장 높았으며 개량제 시용이 없었던 4년차의 공극율이 가장 낮았다. 연차간(年次間)의 평균수량(收量)은 대조구에 비해 수량이 가장 많았던 종합개량구에서 옥수수가 132%, 콩이 29%, 율무가 49%, 고구마가 59% 증수되었다. 토양(土壤)의 개량처리(改良處理)로 각작물 수량의 평균 증수율(增收率)은 옥수수 53%, 총 15%, 율무25%, 고구마 38%이었다. 개량제 비용을 공제한 경제성분석(經濟性分析)에서는 옥수수재배시 퇴비처리구를 제외한 전작물(全作物)에서 개량제 처리는 경제성이 있었으며 고구마의 수익성이 가장 높았다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.323-323
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• 2017

In many sub-Saharan African countries, boosting rice production is a pressing food security issue. To contribute to the increase in rice production, we have developed lines of NERICA 1 introgressed with the gene for spikelet number, Gn1a, and the gene for primary rachis-branch number, WFP by cross breeding. The performance of rice lines introgressed with the genes for yield related traits can be affected by cultivation environment and management. Thus, in this study, we aimed to evaluate the lines of NERICA 1 introgressed with Gn1a or/and WFP for yield and yield components under different nitrogen fertilization conditions in Kenya. A field trial was conducted at a paddy field in Kenya Agricultural and Livestock Research Organization-Mwea, Kirinyaga County ($0^{\circ}39^{\prime}S$, $0^{\circ}20^{\prime}E$) from August 2016 to January 2017. Eight lines of NERICA 1 introgressed with Gn1a and/or WFP, and their parents, NERICA 1 and ST12, were grown under 0 (NF) and $75(SF)kg\;N\;ha^{-1}$. At maturity, five hills per plot were harvested to determine the yield and yield components. The number of primary and secondary rachis-branches per panicle was measured on the longest panicle in each hill. Under SF, the introgression of WFP to NERICA 1 increased the number of primary and secondary rachis-branches by 27 and 25%, respectively. On the other hand, Gn1a did not increase the number of primary rachis-branches, whereas the number of secondary rachis-branches was increased by 38% on average. The number of primary and secondary rachis-branches of the lines introgressed with both genes increased by 25 and 56%, respectively. Although grain number per panicle increased 33% by Gn1a, 34% by WFP, and 43% by Gn1a+WFP, the yield increase by Gn1a, WFP, and Gn1a+WFP was only 14, 7, and 14%, respectively. The suppression of the yield increase was mainly attributed to the decline in the filled grain ratio. Under NF, WFP increased the number of primary and secondary rachis-branches by 20 and 19%, respectively. The introgression of both genes increased the former and the later by 19 and 35%, respectively. However, Gn1a did not change them under NF. Thus, even under NF, grain yield increased 11% by WFP and 24% by Gn1a+WFP due to the increased grain number although filled grain ratio declined. Our findings suggest that the introgression of Gn1a and WFP could contribute to the rice productivity improvement in sub-Saharan Africa even under low fertility conditions. Improving filled grain ratio of the lines introgressed with these genes by further breeding and fertilization management will be the focus of subsequent work.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.322-325
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• 2007

Dent resistance is an important characteristic to avoid damage on automotive outer panels. From a practical point of view, dents can be caused in a number of ways. Considering doors as an example, denting can occur from stone impacts or from the careless opening of an adjacently parked vehicle door. Denting can occur where the door surface is smooth and may not have sufficient curvature to resist dent. These exterior body parts are designed to improve dent resistance using a combination of work hardening and bake hardening. In brief, dent is affected by the shape of the parts and the material properties such as yield strength, strain and thickness. In this work, forming of door outer panel is investigated by Taguchi method. Main parameters are yield strength, thickness, blank size, blank holding force and so on. For the given value of design parameters, forming analysis of the thirty six cases are carried out according to L18 orthogonal array. After comparing the performance by simple conversion of simulation results into dent resistance, the final suggestion of the forming parameters is verified for the best improvement of dent resistance.

• 한국재료학회지
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• 제26권6호
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• pp.325-331
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• 2016

This paper presents a study of the tensile properties of austenitic high-manganese steel specimens with different grain sizes. Although the stacking fault energy, calculated using a modified thermodynamic model, slightly decreased with increasing grain size, it was found to vary in a range of $23.4mJ/m^2$ to $27.1mJ/m^2$. Room-temperature tensile test results indicated that the yield and tensile strengths increased; the ductility also improved as the grain size decreased. The increase in the yield and tensile strengths was primarily attributed to the occurrence of mechanical twinning, as well as to the grain refinement effect. On the other hand, the improvement of the ductility is because the formation of deformation-induced martensite is suppressed in the high-manganese steel specimen with small grain size during tensile testing. The deformation-induced martensite transformation resulting from the increased grain size can be explained by the decrease in stacking fault energy or in shear stress required to generate deformation-induced martensite transformation.

• Bulletin of the Korean Chemical Society
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• 제34권6호
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• pp.1727-1734
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• 2013

Synthesis and characterization of some novel symmetric bis-azospiropyrans are reported in this study. These bis-azospiropyrans are bifunctional chromophores with two spiropyrans linked by a bis-azo extended aromatic system that produce more color strength (large molar absorption coefficient in mero forms) due to appending two azospiropyran chromophores on one molecule. Comparing to the molar absorption coefficients of the conventional spiropyran chromophores (${\varepsilon}=0.31{\times}10^4\;M^{-1}{\cdot}cm^{-1}$) and mono-azospiropyran chromophores ($1.35{\times}10^4\;M^{-1}{\cdot}cm^{-1}$), the novel synthesized photochromes showed astonishingly increased molar absorption coefficients ($2.3-3.8{\times}10^4\;M^{-1}{\cdot}cm^{-1}$) at the same conditions. Such high molar absorption coefficients confers high sensitivity to light and more color intensity of mero form, that leads to improvement of their light sensitivity and better discrimination of spiro (OFF) form from mero (ON) ones in molecular switches. The structures were deduced from their MS, FT-IR, and $^1H$-NMR spectroscopic data and CHN analysis. All the synthesized photochemically bifunctional compounds revealed fluorescent emission in their colorless form which was faded out after exposing to UV light. Fluorescence quantum yield values of the mero forms were 0.25-0.81 and two high fluorescence quantum yield values (0.60 and 0.81) were found in these series.

• Asian-Australasian Journal of Animal Sciences
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• 제14권7호
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• pp.899-904
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• 2001

A field trial on selection for increased live weight in Black Bengal (BB) goat was conducted over two generations. Parents of both sexes were selected (mass selection) based on mature body weight criteria set against age. A parallel randomly mated line was maintained to compare the response (R) of selection at birth. 3, 6, 9 and 12 months of age in both generations. Lactation yield (LY), average per day yield (APDY) and lactation length (LL) were evaluated in the selected line in comparison to randombreds as a result of correlated response. Live weights were significantly improved at onward bir:th in first generation and only at birth in second generation. Improvements (%) in live weight at 3, 6. 9 and 12 months in first generation were 17.6, 18.4, 16.6, and 12.0 at birth in second generation. Significant correlated R were found in LY and APDY. Results suggest that there may be a positive relationship between live weight and lactational traits in BB goats of Bangladesh. It was also concluded that such a field scheme can be effectively used for genetic improvement of goats in subsistence farming, at least for short term gain.

• 한국작물학회지
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• 제46권3호
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• pp.176-179
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• 2001

Source와 sink의 상대적 크기가 다른 고구마 품종간 이면접목을 통하여 생육에 미치는 고구마의 source와 sink의 상호관계를 분석함으로써, 고구마의 품종육성 및 재배법개선에 필요한 기초자료를 얻고자 수행한 결과를 요약하면 다음과 같다. 1 만장, 괴근수는 접목에 의하여 감소되었으며, 접목조합에 따라서 차이가 있었다. 2. 지상부의 생육은 접수, 지하부의 생육은 대목의 영향을 많이 받았다 3. 주만장과 괴근수에 대한 접목효과, 접수와 대목의 효과와 이들 간의 상호작용은 모두 유의성이 있었다. 4. 상저비율은 보통삽식＞자가접목＞이면접목 순으로 높았다.

• 품질경영학회지
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• 제46권3호
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• pp.707-716
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• 2018

Purpose: This study aims to analyze the management performance and production efficiency of strawberry farmers who introduced smart farming, one of the primary symbols of the fourth industrial revolution in the agricultural sector. Methods: We conducted an empirical survey of strawberry farms using smart farming and analyzed production efficiency using DEA method. Results: First, difficulties for strawberry farmers introducing smart farming included time and money spent on parts replacement and additional costs due to compatibility problems with existing facilities after the adoption. Second, strawberry farmers using smart farming increased their total income by producing higher yield and improving quality thanks to the competent growth management. Third, the analysis of production efficiencies before and after smart farming found improvement in technical efficiency, pure technical efficiency, and scale efficiency. But, the gaps in technical and scale efficiencies among the farms widened. Conclusion: Based on the results above, following policy suggestions are offered. First, an environment control technology suitable for strawberry farming needs to be developed. Second, the smart farming technology needs to be standardized by the government. Third, new smart farm models need to be developed to accommodate to the facilities and environment in Korea through collecting big data including high-quality data on the environment, growth, and yield. Fourth, continuing education needs to be provided to narrow the gap in smart farming technology among strawberry farmers.