• The Korean Journal of Food And Nutrition
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• v.25 no.3
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• pp.538-545
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• 2012

The objective of this work was to study the effect of far infrared ray-vacuum drying having reflection and dispersion functions(RD-FRVD) and hot air drying(HAD) on the quality changes of dried vegetable flakes. HAD was regarded as a control. Browning degrees, color value, titratable acidity and pH value were measured as chemical evaluations. Rehydration and electron micrographs were investigated as physical evaluation. Microbial cells were counted. The color value and browning degrees were increased in both RD-FRVE and HAD. In case of degree of those changes, RD-FRVD made less changes than HAD. Especially, green bean sprout had no differences in color value and browning degrees between raw material and dried-rehydrated material. There were no significance differences in titratable acidity and pH value between raw material and dried-rehydrated material. The total microbial counts were gradually reduced in RD-FRVD. The rehydration rates of dried vegetable flakes were typically increased in RD-FRVD. Also, these results were investigated electron micrographs evaluation. Therefore, these results showed that the quality of dried-rehydrated vegetable flakes was typically enhanced by using RD-FRVD.

• Journal of Bio-Environment Control
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• v.10 no.4
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• pp.237-243
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• 2001

The experiment was conducted to investigate the effect of different mulching materials on the growth and quality of oriental melon in protected cultivation. Soil temperature, plant growth and fruit quality were affected by different mulching materials, clear polyethylene (P.E.) film (control), clear inset between black P.E. film, green P.E. film. and recycled ethylene vinyl acetate (E.V.A.) film. The highest night soil temperature was at 20 cm depth under green P.E. film, but was at 5 cm depth under other materials. Difference of soil temperature as affected by mulching materials decreased with increasing soil depth. Plant height, number of nodes, leaf area index (LAI), crop growth rate (CGR), and relative growth rate (RGR) at 30 days after transplanting were significantly greater in the recycled E.V.A. film treatment than in the other treatments. Fresh weight of weeds growth under the mulching materials was not affected by mulching material at 30 days after transplanting. However, it was the greatest under clear P.E. film mulching at 90 days after transplanting. Harvesting time of recycled E.V.A. film was 2 days earlier than that of clear P.E. film. Difference in fruit weight and length, and soluble solid content were not affected by the mulching materials. Marketable yield was 2,426 kg.10a$^{-1}$ in recycled E.V.A. film treatment, which was 6% greater than in clear P.E. film treatment.

• Applied Chemistry for Engineering
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• v.27 no.5
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• pp.495-501
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• 2016

Mineral oil has been widely used as an insulating oil for electrical transformers for a long time, but the necessity of employing new insulation oil such as vegetable oil has been increased due to urgent needs for the biodegradability when it leaks and also for the thermal stability at a higher operation temperature. Although specific periods are required between the production and consumption, there are still short of the data to prove the insulation oils' storage stability depending upon various circumstances and their resources. Thus, this paper demonstrates the insulation oils' oxidation characteristics of both mineral and vegetable oils when each was exposed to different environments for 12 weeks. From this test, some properties including total acid number, water content and dielectric breakdown were changed under specific conditions and resources. Vegetable oils showed higher hydrophilicity and water saturation than those of mineral oils due to their molecular compositions. Under sunlight exposure condition, all insulation oils oxidized and changed their properties when exposing to the direct light, regardless of the resource used.

• Journal of The Korean Society of Grassland and Forage Science
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• v.4 no.1
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• pp.23-27
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• 1983

This experiment was carried out to show how to make the silage of raddish and Chinese cabbage leaves remained after pickling vegetable in autumn. The moisture of raw materials was controlled by the rice straw and barley bran. The results obtaind were as follows; 1. the silage composed of vegetable leaves 70%, rice straw 20% and barley bran 10% showed the best quality and desirable acid content. 2. Adding barley bran increased the crude protein, crude fat, and crude fiber in the silage. 3. 10% of barley bran made the silage more palatable and also have a good colour.

• Journal of Biosystems Engineering
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• v.40 no.3
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• pp.238-249
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• 2015

Purpose: Fruit and vegetable production is a fast-growing sector in East Africa, and it bears considerable local and international market potential. In an effort to analyze the challenges within this sector and suggest possible solutions, this study reviews the postharvest handling technologies commonly used with fruits and vegetables in East Africa. Methods: During the course of this study, small-scale farmers were identified as the most prominent producers of fruit and vegetable crops in the region. Results: We found that many of these small-scale farmers employed relative simple and inexpensive techniques in handling their limited volumes of produce. Several factors could be addressed to reduce postharvest losses, including weak policies, inferior infrastructure, and poor market strategies. However, the lack of basic knowledge (including demographic, scientific, and economic knowledge) among the stakeholders (e.g., researchers, farmers, governments, nongovernment organizations, and merchants) on how to develop, implement, use, and sustain the recommended handling technologies is probably the most problematic. Conclusions: We recommend that high priority be placed on closing the knowledge gap, which could enhance the efforts of all the stakeholders to address and reduce postharvest losses.

• The Journal of Asian Finance, Economics and Business
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• v.8 no.9
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• pp.333-340
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• 2021

In Vietnam, the desire to consume organic vegetables is increasing as people become increasingly concerned about foods that contain several chemicals and toxins that are hazardous to their health. However, numerous subjective and objective factors continue to influence customers' purchase intention and behavior, indicating that this market has not yet reached its full potential. The study analyzes the impacts of trust, price, and convenience on consumers' consumption behavior and frequency of using organic vegetables in Northern Vietnam. We surveyed 312 consumers in the region. After classifying the data, 178 participants have used or regularly used organic vegetables selected for further study. Next, the author applied SmartPLS software with version 3.3 to test the hypotheses and analyze the effects of the observations. The result shows that three main factors affect customers' organic vegetable consumption behavior, especially perceived convenience. This study contributes to the development of comprehensive policy mechanisms and regulations on product traceability. Furthermore, market management authorities must have a strategy in place to inspect the product quality of organic vegetable store chains regularly to build customer trust and support the growth of organic vegetable production and supply chains in Vietnam's northern region.

• Journal of Bio-Environment Control
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• v.16 no.3
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• pp.167-173
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• 2007

This study was conducted to improve light environment of oriental melon cultivation in winter season. Three polyolefin foreign films (J-1, J-2, J-3) and three polyethylene domestic films (K-1, K-2, K-3) with different film thickness, ultraviolet ray interception and infrared ray absorption were used. As the result of this experiment, soluble solid of oriental melon fruit in K-3 was $14.3^{\circ}Brix$, those in J-3 and J-2 were higher by 1.3 and $0.8^{\circ}Brix$, respectively. Chromaticity (a value) of pericarp in K-3 was 0.5, those in J-3, J-1 and J-2 were higher by 3.3, 2.3 and 1.9, respectively. Especially, fermented and malformed fruit rates in J-1, J-2 and J-3 were decreased and marketable fruit rates were increased. Marketable yield in K-3 was 1,622 kg per 10a, those in J-1, J-3 and J-2 were increased by 31.2%, 23.8% and 18.5% compare to K-3, respectively. In this study, Polyolefin films (J-1, J-2, J-3) with thickness and infrared ray absorption ratio keeping higher heat conservation, therefore, soluble solid and chromaticity of fruit were increased, fermented fruit rate was decreased, and marketable fruit rate and yield were increased.

• Food Science and Preservation
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• v.21 no.4
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• pp.460-467
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• 2014

This study was conducted to investigate the effect of the addition of Hizikia fusiforme, Capsosiphon fulvescens, and Undaria pinnatifida sporophyll on the antioxidant and inhibitory potentials against key enzymes related to type 2 diabetes of a commercial vegetable extract. The nutritional quality and mineral concentration of a vegetable extract with seaweeds added were also analyzed. The addition levels of seaweed did not influence the proximate composition, whereas the calcium, sodium, potassium, magnesium, and iron concentrations significantly increased at the 5% Hizikia fusiforme and Undaria pinnatifida sporophyll addition levels. The 20% Hizikia fusiforme addition level significantly increased the total phenolic content and reducing power by 47.08% and 16.82%. The hydroxyl radical scavenging ability of the vegetable extract was not strengthened with the addition of seaweeds. The DPPH radical scavenging activity at the 20% Hizikia fusiforme, Capsosiphon fulvescens, and Undaria pinnatifida sporophyll addition levels significantly increased by 27.47%, 22.25%, and 17.27%, respectively. The vegetable extract with seaweeds added showed higher-level ${\alpha}$-glucosidase inhibition activities, accompanied by relatively weaker ${\alpha}$-amylase inhibition activity. In particular, at the 5% Undaria pinnatifida sporophyll addition level, the ${\alpha}$-glucosidase activity was significantly inhibited by 98.26%. Overall, the results showed that the incorporation of seaweeds into a vegetable extract effectively increased the mineral concentration and improved the antioxidant and inhibitory abilities of the extract on key enzymes linked to type 2 diabetes.

• Journal of Bio-Environment Control
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• v.13 no.4
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• pp.240-244
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• 2004

This study was conducted to evaluate the effect of different surfactants on the fertilizer reduction and increase of the mineral nutrients uptake of lettuce (Latuca sativa L. 'Hanbatchungchima') in deep flow technique culture. The measured items from lettuce leaves expanded fully were growth, photosynthetic and transpiration rate, and mineral nutrient content K, Ca and Mg, respectively. The highest growth were observed at $0.3mg{\cdot}L^{-1}$ polyvinyl alcohol (PV4-95) treatment, including lettuce grown in the half strength of nutrient solution. The highest photosynthetic rate, transpiration rate and mineral nutrient content were observed at $0.3mg{\cdot}L^{-1}$ calcium lignosulfate (CLS) treatment. Therefore, high-quality leaf lettuce production could be achieved by apply proper surfactants PVA-95 and CLS, which can cut down the total amount of fertilizer and increase uptake of mineral nutrients.

• Proceedings of the Korean Society of Crop Science Conference
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• 1994.06a
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• pp.50-51
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• 1994