Informal engineering education program for high school students was developed to cultivate engineering literacy using the human resources and facilities of university. Plant factory, a smart farming technology, was selected as a main theme, and the novel engineering camp program involving engineering design activities and intra-linter-team works was planned. The camp program was applied to 38 high school students in an active learning classroom. Five teams were constructed according to elemental technologies such as biotechnology, information-communication technology, energy engineering, mechanical engineering and architectural engineering, and the students were participated in intra- and inter-team activities to achieve the final goal of 'the construction of a plant factory in school'. The team works were conducted according to the eight steps of engineering design process (identifying the problem and need, identifying criteria and constraints, brainstorming possible solutions, selecting the best possible solution, constructing a prototype, testing and evaluating the solution, communicating the solution, and refining design). Participants' satisfaction survey showed that the satisfaction on the contents of engineering design was 4.48 on 5-point Likert scale. The participants' satisfaction on creative activity and systematic methodology was 4.43 on 5-point Likert scale. 97% of participants responded positively to team works, and 92% of participants were satisfied with career mentoring activity supplied by undergraduate/graduate students. These results indicates that the engineering camp program involving engineering design activity and intra-/inter-team works can contribute to cultivate engineering literacy such as creativity, problem solving ability, collaboration, communication skills for high school students, and to increase their interests in engineering fields.
Korean Journal of Agricultural and Forest Meteorology
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v.22
no.4
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pp.312-326
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2020
Generation of weather forecasts at 100 m resolution through a statistical downscaling process was implemented by Korea Meteorological Administration Post- Processing (KMAPP) system. The KMAPP data started to be used in various industries such as hydrologic, agricultural, and renewable energy, sports, etc. Cheorwon area and Jeonbuk area have horizontal planes in a relatively wide range in Korea, where there are many complex mountainous areas. Cheorwon, which has a large number of in-situ and remotely sensed phenological data over large-scale rice paddy cultivation areas, is considered as an appropriate area for verifying KMAPP prediction performance in agricultural areas. In this study, the performance of predicting KMAPP temperature changes according to ecological changes in agricultural areas in Cheorwon was compared and verified using KMA and National Center for AgroMeteorology (NCAM) observations. Also, during the heat wave in Jeonbuk Province, solar radiation forecast was verified using Automated Synoptic Observing System (ASOS) data to review the usefulness of KMAPP forecast data as input data for application models such as livestock heat stress models. Although there is a limit to the need for more cases to be collected and selected, the improvement in post-harvest temperature forecasting performance in agricultural areas over ordinary residential areas has led to indirect guesses of the biophysical and phenological effects on forecasting accuracy. In the case of solar radiation prediction, it is expected that KMAPP data will be used in the application model as detailed regional forecast data, as it tends to be consistent with observed values, although errors are inevitable due to human activity in agricultural land and data unit conversion.
Kim, Chulyoung;Choi, Duyeol;Kang, Jeong Hun;Ahmed, Shabbir;Kil, Eui-Joon;Kwon, Gimyeon;Lee, Gwan-Seok;Kim, Yonggyun
Korean journal of applied entomology
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v.60
no.4
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pp.387-401
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2021
Thrips infesting hot peppers were monitored in greenhouses using yellow sticky traps. In addition, the hot peppers infected with tomato spotted wilt virus (TSWV) were observed during the monitoring period. The flower thrips (Frankliniella intonsa) were initially trapped at a low density just after transplanting seedlings of hot peppers at late March. The western flower thrips (Frankliniella occidentalis) were trapped after mid April. These two thrips represented more than 98% of the total thrips attracted to the traps after May, in which F. intonsa showed higher occurrence frequency than F. occidentalis. The total number of thrips had two peaks at mid May with a small and short-term peak and at June-July with a large and long-term peak. The trapped thrips exhibited inconsistent sex ratios, suggesting a seasonal parthenogenesis. Different geographical populations were varied in cytochrome oxidase I sequences, in which local populations in Andong shared a high sequence similarity. TSWV-infected hot peppers, which might be mediated by these two thrips species, were observed and confirmed by an immunoassay kit and a molecular diagnosis using RT-PCR. In addition, the TSWV was detected in F. occidentalis collected from the infected hot peppers. Three open reading frames (NSS, N, and NSM) of the isolated TSWV genomes were sequenced and showed multiple point mutations containing missense mutations among geographical variants. When the isolated TSWV was fed to nonvirulent thrips of F. occidentalis, the virus was detected in both larvae and adults. However, the viral replication occurred in larvae, but not in adults.
These days, the demand of farm tours is on the rise in Korea. However, most of them are related to farming experience. To overcome the situation, ecological experience is introduced. In this sense, it is necessary to obtain the contents and educational materials of ponds, the space of farming and ecological experience. Therefore, this study analyzed the use patterns of oriental medicine of pond wetland plants. Oriental medicine is used for old and traditional knowledge, and is still applied to various fields, such as medical science, pharmacy, and science. The analyzed result of this study will be helpful for the educational materials of ecological experience. This study surveyed plants of 40 pond wetlands in rural areas, and looked into the use patterns of traditional medicine by using the contents of Korea Traditional Knowledge Portal being operated by Korean Intellectual Property Office. According to the vegetation survey of the 40 pond wetlands, there were a total of 457 taxa in 108 families, 309 genera, 392 species, 59 varieties, 5 forma, and 1 subspecies. Among them, 314 taxa in 53 families, 136 genera, 265 species, 45 varieties, 3 forma, and 1 subspecies had the information on the use patterns of traditional medicine. It means that 68.8% of the plants around pond wetlands contain traditional medicine. Given other application patterns, such as food, handcraft and traditional farming, more than 70~80% are expected to include traditional knowledge. 314 taxa used for traditional medicine had 570 kinds of efficacy and 325 kinds of disease treatment. It means that one taxon has 4.0 (0~20) kinds of efficacy on average and 6.6(0~20) kinds of disease treatment. It is expected that this study result will be applied to various fields, including experience, education, and medical science. And it is considered that valuable pond wetlands are worthwhile to be conserved constantly.
The Larch was known unsuitable species for the wood cement board owing to its some inhibitory substances. Therefore this research was carried out to evaluate the effect of pretreatments and chemical additives on the properties of woodflake cement board from Japanese larch (Larix leptolepis) grown in Korea. In order to improve the board qualities, the woodflakes were treated by cold water or dilute NaOH solutions(0.1, 0.5, and 2.0%), and also some chemicals($CaCl_2$, $Al_2Cl_3$ and $Na_2SiO_4$) added to the wood cement mixture. The results obtained are summarized as follow; 1. The wood cement boards from the woodflake treated with 0.1% NaOH showed remarkable higher bending strengths and internal bonding strengths than those from the flake pretreated with cold water. 2. The bending strengths showed over $60kg/cm^2$, i.e. the standard strength of JIS A-5417, with pretreatments of NaOH over 0.1% and additive of $CaCl_2$ 3.0%. The maximum strengths showed at about 0.5 of every additives. 3. Addition of $CaCl_2$ and $Al_2Cl_3$, in the case of pretreated wood with NaOH above 0.1%, had effects on increasing the internal bonding strengths of sample boards. 4. The thickness swellings became decreasing along with the increasing NaOH pretreatment concentntration. 5. The equilibrium conditions of the sample boards pretreated with NaOH over 0.1% and added with $Al_2Cl_3$ and $CaCl_2$ were maintained at 9.0~10.5% moisture contents. 6. The specific gravity of the samples showed close relationships with strength properties.
BACKGROUND: Hydroponics is one of the methods for evaluating plant production using the inorganic nutrient solutions, which is applied under the artificial light conditions of plant factory system. However, the application of the conventional inorganic nutrients for hydroponics caused several environmental problems: waste from culture mediums and high nitrate concentration in plants. Organic nutrients are generally irrigated as a supplementary fertilizer for plant growth promotion under field or greenhouse conditions. Hydroponic culture using organic nutrients derived from the agricultural by-products such as dumped stems, leaves or immature fruits is rarely considered in plant factory system. Effect of organic or conventional inorganic nutrient solutions on the growth and nutrient absorption pattern of green and red leaf lettuces was investigated in this experiment under fluorescent lamps (FL) and mixture Light-Emitting Diodes (LEDs). METHODS AND RESULTS: Single solution of tomatoes (TJ) and kales (K) deriving from agricultural by-products including leaves or stems and its mixed solution (mixture ration 1:1) with conventional inorganic Yamazaki (Y) were supplied for hydroponics under the plant factory system. The Yamazaki solution was considered as a control. 'Jeockchima' and 'Cheongchima' lettuce seedlings (Lactuca sativa L.) were used as plant materials. The seedlings which developed 2~3 true leaves were grown under the light qualities of FL and mixed LED lights of blue plus red plus white of 1:2:1 mixture in energy ratio for 35 days. Light intensity of the light sources was controlled at 180 μmol/㎡/s on the culture bed. The single and mixture nutrient solutions of organic and/or inorganic components which controlled at 1.5 dS/m EC and 5.8 pH were regularly irrigated by the deep flow technique (DFT) system on the culture gutters. Number of unfolded leaves of the seedlings grown under the single or mixed nutrient solutions were significantly increased compared to the conventional Y treatment. Leaf extension of 'Jeockchima' under the mixture LED radiation condition was not affected by Y and YK or YTJ mixture treatments. SPAD value in 'Jeockchima' leaves exposed by FL under the YK mixture medium was approximately 45 % higher than under conventional Y treatment. Otherwise, the maximum SPAD value in the leaves of 'Cheongchima' seedlings was shown in YK treatment under the mixture LED lights. NO3-N contents in Y treatment treated with inorganic nutrient at the end of the experiment were up to 75% declined rather than increased over 60 % in the K and TJ organic treatment. CONCLUSION: Growth of the seedlings was affected by the mixture treatments of the organic and inorganic solutions, although similar or lower dry weight was recorded than in the inorganic treatment Y under the plant factory system. Treatment Y containing the highest NO3-N content among the considered nutrients influenced growth increment of the seedlings comparing to the other nutrients. However effect of the higher NO3-N content in the seedling growth was different according to the light qualities considered in the experiment as shown in leaf expansion, pigmentation or dry weight promotion under the single or mixed nutrients.
Watermelon (Citrullus lanatus) is an economically important vegetable crop all over the world, which has functional compounds such as lycopene and citrulline. Gummy stem blight caused by Didymella bryoniae is one of the most devastative diseases in watermelon. Single nucleotide polymorphisms (SNPs), which are genetic variations occurring between individuals with respect to a single base, were often used to construct genetic linkage maps and develop molecular markers linked to a variety of horticultural traits and resistance to several diseases. In this study, we developed high-resolution melting (HRM) markers based on SNPs generated from NGS resequencing of two parents in watermelon. Plant materials were C. lanatus '920533' (female and susceptible parent), C. amarus 'PI 189225' (male and resistant parent), and their $F_1$ and $F_2$ progenies. A total of 13.6 Gbp ('920533') and 13.1 Gbp ('PI 189225') of genomic sequences were obtained using NGS analysis. A total of 6.09 million SNPs between '920533' and 'PI 189225' were detected, and 354,860 SNPs were identified as potential HRM primer sets. From these, a total of 330 primer sets for HRM analysis were designed. As a result, a total of 61 HRM markers that have polymorphic melting curves were developed. These HRM markers can be used for the construction of SNP-based linkage maps and for the analysis of quantitative trait loci (QTLs) related to gummy stem blight resistance.
This study was conducted to investigate the effects of pig manure composting using starch pulp m growth and yield characteristics of potato cropping. Four treatments ; No compost, 1 : 1 : 0, 1 : 0.75 : 0.25 and 1 : 0.5 : 0.5 the mixing ratio of pig manure, saw dust, and dehydrated starch pulp and composting by Piling and blowing methods. Plant heights in first growth stage were higher for the treatment of saw dust compost and starch pulp compost than the treatment of chemical fertilizer, but after the stage, there were no significant difference among treatments. The number of stolons were met for 10.9 in 1 : 0.5 : 0.5 treatment, following 1 : 0.75 : 0.25 and 1 : 1 : 0. On the other hand, tuber diameter and top dry matter weight tended to be larger for manure treatment than no treatment but there was no significant difference. Total number of tubers were largest for 1 : 0.5 : 0.5, and those for 1 : 1 : 0 and 1 : 0.75 : 0.25 were similar. Tuber yields of not more than 80g tended to be different, but those of between 81g and 120g and more than 120g were apparently larger for the compost treatment than no treatment. The ratio of marketable tubers appeared large to be about 86% for 1 : 0.75 : 0.25 and 1 : 0.5 : 0.5 treatments. Ratio of infected common scab on potato tubers tended to be highest for 1 : 0.5 0.5 but there were no statistical significance. However, when compost was made by mixing starch pulp in future, the solutions to the occurrence of infected common scab must be considered, The contents of N. P, K and Ca in leaves were larger for the compost treatment than no treatment, but no significant difference was observed, Accordingly, the effects of treating starch pulp compost on growth and yield characteristics of potato cropping were more affirmative than those of saw dust compost.
Kang, Ho Bum;Ryoo, Seung Heui;Lee, Sang Hoon;Jeon, Byung Soon;Sang, Byung Chan
Korean Journal of Agricultural Science
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v.25
no.1
/
pp.79-88
/
1998
This study was performed in order to apply to effective breeding of Korean native cattle on the molecular genetic level obtained from PCR and nucleotide sequencing analysis of BoLA DRB3 exon2 that has important roles in host immune defence. Genomic DNA used in this study was prepared from the blood of Korean native cattle in Korean Native Cattle Improvement Center of National Livestock Cooperation. The results obtained from this study are summarized as follows: 1. Genomic DNA extracted from the blood of Korean native cattle was subjected to electrophoresis on 1.5% agarose gel. Major band was bigger than 12.2kb, indicating that genomic DNA was well prepared for PCR. Amplified products of 284bp fragments was obtained the amplification of BoLA DRB3 exon2 gene by PCR. 2. Cloning of BoLA DRB3 exon2 of Korean native cattle with pCR2.1 vector was conformed by 300bp fragment from recombinent plasmid that restricted with enzyme digestion of EcoRI. 3. Homology of BoLA DRB3 exon2 alleles of parent was 82.0% between sire's alleles and 90.1% between dam's alleles. 4. In pedigree analysis using BoLA DRB3 exon2 gene, sequencing result of BoLA DRB3 exon2 genes showed inheritance by Mendelian mode through the parents to their offspring. 5. Taking together those experimental results, pedigree was confirmed on the basis of sequencing for the alleles of parents and offspring. This knowledge by the molecular biological approach could be served for the improvement of Korean native cattle.
This study was conducted to develop a set of EST-SSR marker for the purity test of commercial F1 hybrid cultivars in the watermelon. A total of 353 EST-SSR were selected and tested on seven F1 cultivars and their 11 parental lines achieved from NH Seeds Inc., Korea. Among tested 96 primer sets, WMU0056 for 'Orange', WMU0400 for 'Heukbo', WMU0056 and WMU0400 for 'Sindong', and WMU0056 and WMU0400 for 'Serona' revealed polymorphisms between the parental lines and heterozygosity from these F1 cultivers. Of 122 primer sets tested for 'Haedong', WMU0056, WMU0400, WMU0580, WMU1211, WMU4136, and WMU448 showed polymorphisms that were appropriate for the F1 purity test. WMU0056 and WMU0400 can be useful for 'Haedong', as well. Relatively low polymorphisms between parental lines were detected for 'Kulnara'(5%) and 'Hwangpea'(2%), and therefore, all 353 primer sets were tested on these cultivars. As the result, WMU5339 and WMU7003 were found to be useful for the F1 purity test in 'Kulnara' and 'Hwangpea', respectively. Using these EST-SSR markers developed by ICuGI, hybridity of the seeds for four F1 cultivars produced from farmers was evaluated, and levels of the F1 purity higher than 97.5% was observed from all seed populations. Our results indicated that the watermelon EST-SSR marker information posted in ICuGI could be utilized for developing codomiant and locus-specific markers that are highly effective for the F1 purity test.
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