• 한국초지조사료학회지
• /
• 제9권2호
• /
• pp.68-76
• /
• 1989

The effect of characteristic of mixture sowing combination on the development of botanical composition was conducted for 12 years on the meadow experiment. The results of this study were summarized as follows. 1. Festuca pratensis lost the expected position of a dominant species. Its vegetation ratio decreased gradually until the last survey year. 2. Arrhenatherum elatius, known as a typical 2-cutting grasss, developed to a dominant species only in the 3- cutting plot without limitation. 3. Alopecurus pratensis, whose feeding value diminishes rapidly, developed to a dominant species regardless of N-fertilization under the condition of 3-cutting, even though the same small amount of seeding was introduced as usual. 4. Trisetum flavescens which causes calcinose exceeded the 40% of vegetation ratio which was the approved rate for feeding at the high N-level (2OOKgIha). 5. Among the introduced, the species showed the significance in quantity were Lotus corniculafus solely in the 2-cutting plot, and Trifolium repens solely in the 3-cutting plot. In the 3-cutting plot legume yet remained under N-fertilization. 6. The appropriate ratio of vegetation for the subordinate species in the mixture sowing combination was easily attained from the least amount of seeding (Gramineae with max. 3Kg/ha, Leguminosae with max. 2kgIha). 7. Into the mixture sowing combination, infiltrated unintroduced species marked more noticeably in the 2- cutting plot than in the 3-cutting plot.

• 한국융합학회논문지
• /
• 제11권11호
• /
• pp.257-267
• /
• 2020

본 연구는 우리나라 수출 분야의 산업별 고용비중을 다양한 머신러닝 기법을 활용하여 예측하고, 예측성능을 높이기 위하여 머신러닝 기법 예측값들에 예측조합 기법을 적용하였다. 특히, 본 연구에서는 각 머신러닝 기법 예측값들에 부여되는 가중치의 합을 1로 설정하는 제약하의 예측조합 기법을 사용하여 예측의 정확성과 안정성을 확보하고자 하였다. 또한, 본 연구는 산업별 고용비중에 영향을 주는 다양한 변수를 고려하기 위하여 재귀적특성제거 방법을 사용하여 주요 변수를 선별한 후, 머신러닝 기법에 적용함으로써 예측과정 상에서의 효율성을 높였다. 분석결과, 예측조합 방법에 따른 예측값은 머신러닝 기법의 예측값들보다 실제의 산업 고용비중에 근접한 것으로 나타났으며, 머신러닝 기법의 예측값들이 큰 변동성을 보이는 것과 달리 제약하의 예측조합 기법은 안정적인 예측값을 나타내었다.

• Applied Biological Chemistry
• /
• 제32권4호
• /
• pp.357-361
• /
• 1989

두유 제조에서 얻어지는 두유박으로 밀가루 고오지를 이용하여 밀된장을 만든 결과 된장 숙성 중 환원당은 모든 시험구가 숙성 50일경까지 증가하다가 그 이후에는 감소하였고 두유박의 배합비가 많을수록 환원당의 함량이 감소하였으며 amino태 질소함량은 각 시험구 다같이 50일까지는 급격히 증가하나 그 이후에는 증가가 둔화되며 시험구별로는 숙성 초기에는 두유박의 배합비가 많을수록 amino태 질소 함량이 높았으나 숙성후기에는 두유박의 배합비가 많을수록 amino태 질소 함량이 낮았다. 총산 함량은 40일까지는 현저하게 증가하나 그 이후에는 둔화되었으며 각 시험구별로는 그 차이가 극히 적었다. 80일 숙성 된장의 색도는 두유박의 배합비가 많을수록 명도가 높으며 적색도가 약해지는 반면 황색도가 높게 나타났다. 숙성 90일 되는 된장의 관능 검사결과 콩나물 된장국은 대조구가 가장 좋고 두유박의 배합비가 많을수록 맛은 약간 떨어지나 대조구와 시험구 D 사이에만 유의차가 있을 뿐, 대조구와 시험구 A,B,C 사이에는 유의차가 없었다. 된장 그대로의 관능 검사 결과 대조구가 가장 좋은 점수를 얻었고, 대조구 A,B,C,D 순으로 낮은 점수를 얻어 두유박의 배합비가 많을수록 맛이 떨어지는 것으로 나타났으나 대조구와 시험구 A 사이, 시험구 B와 C 사이에는 유의차가 없었다.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2001년도 춘계학술대회논문집D
• /
• pp.553-558
• /
• 2001

To find the effective combinations of blowing ratio and injection angle for a straight slot film cooling, film cooling characteristics was investigated using both flow visualization experiment and numerical simulation. Injection angles from $15^{\circ}\;to\;50^{\circ}$ and blowing ratios from 0.2 to 3.0 were selected for the simulation. Comparison between experimental and numerical results shows a good agreement, for the case of the injection angle of $30^{\circ}$ and blowing ratio ranging from 0.55 to 2.0. Film cooling effectiveness was found to be an increasing function of blowing ratio. The effects of injection angle became prominent as the blowing ratio increases. An interesting phenomenon was found for the injection angle of $15^{\circ}$ : the lowest film cooling effectiveness for the blowing ratio smaller than 1.0, but the highest film cooling effectiveness for the blowing ratio greater than 2.0 within wide range of downstream region. There exist optimum injection angles corresponding to maximum film cooling effectiveness : injection angle of $25^{\circ}$ for the blowing ratio from 0.2 to 2.0, and injection angle of $15^{\circ}$ for the blowing ratio of 3.0. Present study provides a design combination among film cooling effectiveness, blowing ratio, and injection angle.

• 생명과학회지
• /
• 제17권4호
• /
• pp.493-497
• /
• 2007

벼 잡종 $F_1$세대의 종자특성에 대한 유전분석과 잡종강세에 대한 결과는 다음과 같다. 1. $F_1$세대의 유전력은 1수립수가 97.99%로 가장 높았으며 천립중, 완전립율의 순으로 나타났고 완전립율이 입장이나 입폭에 비하여 높은 유전력을 보였다. 2. 교배친의 형질간 상관관계는 완전립율과 1수립수, 입장과 천립중간에 유의한 정의 상관을 보였으나 입장과 1수립수, 입폭과 완전립율간에 유의한 부의 상관을 보였다. 그리고 $F_1$세대의 형질간 상관관계는 입장과 입폭간에 높은 부의 유전상관을 보였으나 표현형상관에서는 유의성이 인정되지 않았다. 입장과 천립중, 입폭과 천립중간에도 높은 정의 유전상관을 나타내었으나 표현형상관은 유의하지 않았다. 3. heterosis는 천립중이 7.71%였고, 다음이 1수립수, 완전립율의 순이었다. heterobeltiosis 또한 천립중이 5.29%였고, 다음이 1수립수, 완전립율의 순이었다. 4. 교배조합간의 heterosis는 입장이 1(밀양165호${\times}$장령도)조합에서 13.33%, 입폭이 12(신동진벼${\times}$장령도)조합에서 13.79%, 완전립율이 3(밀양165호${\times}$남천벼)조합에서 16.11%, 천립중이 5(밀양165호${\times}$동진찰벼)조합과 11(동진찰벼${\times}$고시히까리)조합에서 각각 12.64%, 12.13%, 1수립수가 11(동진찰벼${\times}$고시히까리)조합에서 22.83%로 높았다. 그리고 heterobeltiosis는 입장이 1(밀양165호${\times}$장령도)조합에서 8.80%, 입폭이 12(신동진벼${\times}$장령도)조합에서 10.00%, 완전립율이 3(밀양165호${\times}$남천벼)조합에서 13.06%, 천립중이 5(밀양165호${\times}$동진찰벼)조합과 11(동진찰벼${\times}$고시히까리)조합에서 각각 10.01%, 10.83%, 1수립수가 11(동진찰벼${\times}$고시히까리)조합에서 21.40%로 높았다.

• 한국지능정보시스템학회:학술대회논문집
• /
• 한국지능정보시스템학회 2007년도 한국지능정보시스템학회
• /
• pp.309-320
• /
• 2007

The data imbalance problem which can be uncounted in data mining classification problems typically means that there are more or less instances in a class than those in other classes. It causes low prediction accuracy of the minority class because classifiers tend to assign instances to major classes and ignore the minor class to reduce overall misclassification rate. In order to solve the data imbalance problem, there has been proposed a number of techniques based on resampling with replacement, adjusting decision thresholds, and adjusting the cost of the different classes. In this paper, we study the feasibility of the combination usage of the techniques previously proposed to deal with the data imbalance problem, and suggest a combination method using genetic algorithm to find the optimal combination ratio of the techniques. To improve the prediction accuracy of a minority class, we determine the combination ratio based on the F-value of the minority class as the fitness function of genetic algorithm. To compare the performance with those of single techniques and the matrix-style combination of random percentage, we performed experiments using four public datasets which has been generally used to compare the performance of methods for the data imbalance problem. From the results of experiments, we can find the usefulness of the proposed method.

• 한국콘텐츠학회논문지
• /
• 제20권12호
• /
• pp.49-57
• /
• 2020

본 연구는 우리나라 수출 분야 산업의 경쟁력을 나타내는 부가가치율을 다양한 머신러닝 기법을 활용하여 예측하였다. 아울러, 예측의 정확성 및 안정성을 높이기 위하여 머신러닝 기법 예측값들에 예측조합 기법을 적용하였다. 특히, 본 연구는 산업별 부가가치율에 영향을 주는 다양한 변수를 고려하기 위하여 재귀적특성제거 방법을 사용하여 주요 변수를 선별한 후 머신러닝 기법에 적용함으로써 예측과정의 효율성을 높였다. 분석결과, 예측조합 방법에 따른 예측값은 머신러닝 기법 예측값들보다 실제의 산업 부가가치율에 근접한 것으로 나타났다. 또한, 머신러닝 기법의 예측값들이 큰 변동성을 보이는 것과 달리 예측조합 기법은 안정적인 예측값을 나타내었다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제24권9호
• /
• pp.1249-1255
• /
• 2011

This study examined the effect of CLA, flaxseed oil and fish oil and their combination forms on crude fat of liver and fatty acid profiles of liver, breast and thigh meat in broiler chicks. A total of 72, 1-day-old Cobb broilers were assigned to 6 groups, and fed an experimental diet supplemented with 5 different fat sources; conjugated linoleic acid (2% CLA), flaxseed oil (2% FXO), fish oil (2% FHO), CLA and flaxseed oil combination (1:1; 2% CXO), and CLA and fish oil combination (1:1; 2% CHO). Eight birds per treatment were processed, and liver, breast and thigh samples were investigated at 21 d of age. As a result of this study, most fatty acids of liver, breast and thigh meat were influenced by fat sources supplemented in the diet (p<0.05). CLA addition resulted in an increase of crude fat and saturated fatty acid (SFA) content but a concomitant decrease in n-3 to n-6 fatty acid ratio was observed in liver (p<0.05). Moreover, the same trends of SFA and n-3 to n-6 fatty acid ratio were also observed in breast and thigh meats of birds fed CLA alone. In the CXO-fed group or CHO-fed group, n-3 and n-3 to n-6 fatty acid ratio in both breast and thigh meat increased compared with CLA group, while SFA content decreased (p<0.05). FHO fed-groups had the lowest proportion of n-6 fatty acid in both breast and thigh meats compared to other fat source treatments (p<0.05). In conclusion, the increased levels of crude fat and SFA in liver and meats obtained by feeding CLA could be reduced by its combination with FXO or FHO. In addition, the combination of CLA and FXO or FHO fed to broiler chicks could increase the n-3 to n-6 fatty acid ratio of their meat along with the deposition of CLA.

• 한국의류산업학회지
• /
• 제9권2호
• /
• pp.138-144
• /
• 2007

The purpose of this research was to compare the harmony of tone on tone coloration according to transformation of color area-ratio in shirt and necktie. The respondents were asked to evaluate 48 stimuli of the shirt and necktie with the coloration of the shirt/necktie, the necktie/shirt was separately compounded to be 4 tones such as vivid, light, dull, dark. The subjects were 288 female undergraduate students. The data was analyzed by using SPSS program. Analysis methods were ANOVA, LSD test and t-test. The results of each can be summerized as follows. As to the red, combination of v-lt made a difference in the harmony of coloration according to the transformation of color area-ratio. As to the blue, combination of v-lt, v-dk, lt-d made a difference in the harmony of coloration according to the transformation of color area-ratio. As to the purple, v-lt, v-d was evaluated as harmonized coloration regardless of area-ratio by both male and female students. As to the green, v-lt, lt-d was evaluated as harmonized coloration regardless of area-ratio by both male and female students.

• 동력기계공학회지
• /
• 제17권1호
• /
• pp.19-26
• /
• 2013

The purpose of the study is carried out volume optimization of a combined system consisting of an LNT and SCR catalysts from the standpoint of its economic feasibility and de-NOx performance. Under the rich air-fuel ratio conditions for 5s (${\Phi}$=1.1), CO, $H_2$ and THC were generated at levels of 4%, 1.2% and $110ppmC_1$, respectively. The NOx conversion of the 1+1 combination was 5% lower than that of the 1.5+0.5 combination, however the reduced volume of the LNT catalyst decreased the total cost by about 6%. Therefore, the optimal volume ratio of the LNT and SCR catalysts was found to be the 1+1 catalyst combination, which has the highest total score in the terms of an economic feasibility and the NOx performance.