• 유통과학연구
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• 제18권9호
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• pp.45-53
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• 2020

Purpose: This study aims at investigating consumers' choice in online food purchasing behavior and the impact on repurchase for fresh food delivery which has recently shown rapid growth in Korea. The study focuses on the user experience factors af fecting satisfaction and intention to continuously use the online food market. Research design, data and methodology: The survey was conducted by 309 people who had purchased fresh food online, and the analysis was conducted using SPSS and AMOS. Structural Equation Modeling was used for the analysis for the verification of hypotheses. The factors that consumers value when ordering fresh food delivery services were defined as system quality, service quality, commodity quality, brand characteristics, and economics from the preceding study and the relationship between satisfaction and willingness to repurchase was verified. Results: When consumers purchase fresh food online, system quality, product quality, brand characteristics, and economics have had a significant impact on satisfaction. Meanwhile, of the five optional attributes of consumers, only economic efficiency has been verified to have a statistically significant impact on repurchase intentions. Conclusions: The results of the study suggested factors that consumers consider important when ordering fresh food online, providing basic data for companies to develop related strategies.

• 농업과학연구
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• 제33권2호
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• pp.129-140
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• 2006

There are need to develop of merchandise of value added fresh ginseng because of high consciousness level of consumer and enlarge of markets for high quality products. The fresh ginseng after harvest was distributed to farmer partually but in general, it was to market by consigner or wholsaler directly after harvest. There were a high difference on storage period of fresh ginseng in different harvesting seasons. The reduction of value of commodities of fresh ginseng for storage period was caused by decomposition and tender of tissue. The storage temperature was under the freezing point and the packing method was sealing tightly by plastic film. As the quality of fresh ginseng was defined by naked eye, it was difficult to sort the quality of ginseng directly harvest.

• 동아시아식생활학회지
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• 제19권5호
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• pp.791-797
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• 2009

We investigated the quality and sensory characteristics of model tomato sauces which was made from fresh Vitaking tomatoes and American canned tomatoes in the mixture ratios of 0:100% ($S_1$), 25:75% ($S_2$), 50:50% ($S_3$), 75:25% ($S_4$) and 100:0% ($S_5$). Soluble solids, reducing sugars, vitamin C and organic acids increased as the contents of fresh tomatoes increased. pH and contents of $\beta$-carotene and lycopene decreased as the contents of fresh tomatoes increased. Lightness(L value) and yellowness (b value) increased as the contents of fresh tomatoes increased whereas redness (a value) didn't show any significant differences among samples. In the preference test, $S_3$ was the most preferred in red color, taste and overall preference. In the descriptive test, $S_1$ ranked the highest in redness, viscosity, palatability and flavor except for sweet and sour taste. $S_5$ was the lowest in redness, viscosity and palatability, being the highest in sour taste. From this result, we found that the mixture ratio of half fresh tomatoes and canned tomatoes was the best condition to make tomato sauce with preferred red color.

• Journal of Biosystems Engineering
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• 제40권1호
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• pp.89-93
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• 2015

Purpose: Machine vision-based image processing methods can be useful for estimating the fresh weight of plants. This study analyzes the ability of two different image processing methods, i.e., morphological and pixel-value analysis methods, to measure the fresh weight of lettuce grown in a closed hydroponic system. Methods: Polynomial calibration models are developed to relate the number of pixels in images of leaf areas determined by the image processing methods to actual fresh weights of lettuce measured with a digital scale. The study analyzes the ability of the machine vision- based calibration models to predict the fresh weights of lettuce. Results: The coefficients of determination (> 0.93) and standard error of prediction (SEP) values (< 5 g) generated by the two developed models imply that the image processing methods could accurately estimate the fresh weight of each lettuce plant during its growing stage. Conclusions: The results demonstrate that the growing status of a lettuce plant can be estimated using leaf images and regression equations. This shows that a machine vision system installed on a plant growing bed can potentially be used to determine optimal harvest timings for efficient plant growth management.

• Applied Biological Chemistry
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• 제40권5호
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• pp.451-454
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• 1997

An attempt was made in this study to analyze volatile flavor components of fresh and odorless garlic (Allium sativum L.), Essential oils in fresh garlic and odorless garlic were isolated by a simultaneous steam distillation and extraction(SDE) method using n-pentane/diethy ether as solvent. A total of 21 and 22 components were identified by GC/MS from the essential oils of fresh garlic and odorless garlic, respectively. Diallyl trisulfide, diallyl disulfide and methyl allyl disulfide were found to be major volatile flavor components in fresh garlic and odorless garlic. By the preparation of ordorless garlic, 77.5% of diallyl trisulfide, 15.0% of diallyl disulfde, 72% of methyl allyl disulfide, and 78.4% of allyl thiol components in fresh garlic were lost. Eleven compounds including 2-vinyl-4H-1,3-dithiin, eugenol and 2-methoxy-4-vinyl-phenol were identified in odorless garlic, but not m fresh garlic.

• 약학회지
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• 제50권4호
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• pp.215-219
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• 2006

This study was carried out to obtain the basic information for non-saponin contents that can be used to index fresh ginseng roots (Panax ginseng C. A. Meyer) cultivated in the Republic of Korea and China. Non-saponin components in fresh gingeng roots which were cultivated in various areas and ages in Korea were determined. Acidic polysaccharide, total polysaccharide, crude polyacetylene were quantitatively analyzed by using the method of spectrophotometric determination, while the total protein was analyzed by using Lowry method. The results show that there were no statistically significant differences for the average contents of four non-saponins among 4-years-old, 5-years-old, and 6-years-old fresh ginseng roots. Additionally, this study assessed the average contents of non-saponin components in 4-years-old fresh ginseng roots (Panax ginseng C. A. Meyer) which were cultivated in Korea and China. The result showed that the average contents of crude polyacetylene and acidic polysaccharide were statistically significant. Four-years-old fresh ginseng roots cultivated in Korea had the higher average contents of crude polyacetylene and acidic polysaccharide than those cultivated in China. However the average contents of total polysaccharide and total protein had no statistically significant difference.

• Journal of Animal Science and Technology
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• 제44권6호
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• pp.701-710
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• 2002

본 연구는 소 난자의 초자화 동결 방법을 설정하기 위하여 체외성숙 소 난자에서 난구세포가 부착된 상태 또는 제거한 상태로 microdrop (MD) 방법과 straw (Straw) 방법을 이용하여 초자화 동결하여 생존율을 검사하였다. 동결 융해난자는 a) 단위발생을 유도하였고 b) 체외수정 후 전핵 형성을 관찰하였으며 c)체외수정 후 수정란 발달을 검사하였다. 초자화 동결 난자의 생존율은 MD 방법을 이용하였을 때가 Straw를 이용하였을 때 보다 높았다 (92.50 vs. 74.19%, p<0.05). MD 방법을 이용하였을 때 대부분의 난자가 생존을 하였다. 단위발생을 유도하였을 때 난할율과 배반포 발달율은 MD (45.05%, 10.81%, p<0.05)가 Straw 방법 보다 높았다 (27.17%, 6.52%, p<0.05). 난구세포의 부착 유무에 따라 동결 융해 후 체외수정 하여 자웅 전핵 형성을 각각 검사하였다. 난구세포 제거 난자에서는 MD와 Straw 방법으로 동결 융해하였을 때 차이가 없었다(80.36% vs. 67.31 %, p<0.05). 정상 수정율 (2PN)에서는 세 처리간에 차이가 없었다 (Fresh; 54.55% vs. MD; 42.22% vs. Straw; 37.14%, p>0.05). 그러나 미수정란 (<1PN)은 Fresh 난자가 동결융해 난자보다 유의적으로 낮았다 (Fresh; 32.47% vs. MD; 57.78% and Straw 62.86%, p<0.05). 다정자 침입은 (3PN) 신선란 (12,99%)에서 발생하였으나 동결 융해 난자에서는 발생하지 않았다. 난구세포가 제거된 난자에서, 정상 수정율 (2PN)은 Fresh와 동결 융해 난자간에 유의적인 차이를 보였다 (Fresh; 59.38% vs. MD; 17.31% and Straw; 30.43%, p<0.05). 또한 미수정율 (<1PN)에 있어서도 신선란과 동결 융해난은 유의적인 차이를 보였다 (Fresh; 23.44% vs. MD; 73.08% and Straw 58.70%, p<0.05). 다정자 침입 (3PN, >4PN)은 신선란과 동결 융해란 모두에서 나타났다. 체외수정 후, 난구세포가 부착된 난자의 2세포기 발달율은 신선란에 비하여 MD 또는 Straw 처리구에서 유의적으로 낮았다 (Fresh; 81.76% vs. MD; 22.22% and Straw; 11.36%, p<0.05). 동결융해난자는 배반포 발달율에 있어서도 신선란에 비하여 유의적으로 낮았다 (Fresh; 28.38 vs. MD; 1.71% and Straw 0%, p<0.05). 난구세포가 제거된 난자에서 2세포기 발달율은 신선란과 MD에서 차이가 없었다 (27.59% vs. 19.25%, p<0.05), 그러나 배반포 발달율에 있어서는 신선란이 MD 또는 Straw 처리구보다 유의적으로 높았다 (4.31% vs. 0.62% and 0%, respectively; p<0.05). 이상의 결과에서, 초자화 동결융해한 소 난자는 체외수정 후 배반포로 발달이 가능함을 나타내주고 있다.

• 한국환경복원기술학회지
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• 제11권4호
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• pp.119-128
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• 2008

In this study, we attempted to seek out the ways to recycle fresh root-chips in the slope revegetation works by breaking tree root wastes occurring during the construction works, also to review the applicability of fresh root-chips as the soil media in slope revegetation works. For this purpose, we organized test units in order to investigate on-site applicability of fresh root-chips (broken chips). In order to examine the desirable ration of combining fresh root-chips with the hydroseeding soil media on the cutting slopes, we organized test units depending on the amount of combination. The following is the main experimental results. 1. At first, we analyzed properties of hrdro-seeding soil media and soil of the experimental sites. The overall results demonstrate that all the test units show proper range for vegetation. 2. We believe that the physical properties of soils in the earlier phase of restoration works on the sloped sites are not greatly affected by the fact whether broken chips exist or not. However, as time elapses, broken chips needs to be investigated further on what kind of impact they have on the soil condition. 3. More species are found in the test unit combining broken chips and we believe that it will contribute to blossoming of green plants and ecological succession of neighboring plants. 4. We performed experiment on possibility for fresh root-chips as substitutes for the hydro-seeding soil-media. In the test unit that combines fresh root-chips, its mixture ratio tends to exceed that of the test unit that does not combine fresh root-chips by 5 %. In case of the Thick-Layer-Soil-Media Hydroseeding works, the mixture ratio of the test unit that combines fresh root-chips after 16 weeks exceeds that of the test unit that does not combine fresh root-chips by 75%. 5. From the result of our experiment, it is obvious that the ratio of mixture and the number of emerging species are higher for the test unit combining fresh root-chips than the test unit that does not combine them. In other words, we can replace the hydro-seeding-soil-media with some Fresh root-chips without affecting the physical property of soil.

• 한국식품조리과학회지
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• 제24권4호
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• pp.501-510
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• 2008

In this study, we evaluated the quality characteristics of sweet potato Sulgidduk produced with varying amounts of fresh sweet potato, after three days of storage. The more fresh sweet potato was added, the higher were the levels of crude protein and crude lipid; however, crude ash contents were lowest in the control sample, and no significant differences in this value were detected among the samples to which fresh sweet potatoes were added. Moisture contents evidenced a tendency to decrease with increases in the amount of added fresh sweet potato and increased storage time, but pH rose with increases in the amount of added sweet potato. Total cell counts showed a tendency toward decrease with increases in the amount of added fresh sweet potato. L values tended to be low with increases in the amount of added fresh sweet potato and a values were lowest immediately after its production, although no consistent tendencies were noted in correlation with the amount of added fresh sweet potato. b values tended to increase directly with the amount of added sweet potato . With increasing storage time, the L and a values decreased, whereas the b value tended to increase. Upon textural assessment, it was observed that hardness, adhesiveness, springiness, gumminess, and chewiness(all textural components except for cohesiveness) increased with increasing quantities of added fresh sweet potato, and these factors also tended to increase with the progression of storage time. After observation via scanning electron microscopy(SEM), it was noted that the cohesiveness also increased with increasing amounts of added sweet potato. With regard to the sensory evaluation, the samples to which 15% fresh sweet potato had been added evidenced the highest acceptability in terms of color, flavor, and s0weetness, and softness and moistness in these samples decreased with increasing percentages of added sweet potato. It has been previously demonstrated that the addition of 15% fresh sweet potato resulted in optimal overall acceptability. In accordance with the aforementioned results, it has been verified that the use of fresh sweet potato in Sulgidduk is possible and probably desirable, and an addition of 15% sweet potato appears to be the optimal approach in terms of overall quality and functionality.

• 한국연초학회지
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• 제12권2호
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• pp.85-90
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• 1990

Pot experiment was conducted to find out the effect of decomposing degree of rice straw on growth characteristics of flue-cured tobacco, NC82. Tobacco growth was hindered by fresh straw of rice application. Generally, it was known that if organic matter of high Carbon/Nitrogen ratio had applied in soil, there was temporary nitrogen deficiency in plant caused by soil microorganism utilized nitrogen contained organic matter. In pot experiment, it was supposed that tobacco growth hindered by fresh straw of rice application was not nitrogen deficiency by soil microorganism, but gas toxicity by fresh straw of rice application.