• Korean Journal of Remote Sensing
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• v.39 no.6_1
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• pp.1225-1234
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• 2023

The intensity of crop water stress caused by moisture deficit is affected by growth and heat conditions. For more accurate detection of crop water stress state using remote sensing techniques, it is necessary to select vegetation indices sensitive to crop response and to understand their changes considering not only soil moisture deficit but also heat conditions. In this study, we measured the MERIS terrestrial chlorophyll index (MTCI) and chlorophyll/carotenoid index (CCI) under drought and heat wave conditions. The MTCI, sensitive to chlorophyll concentration, sensitively decreased on non-irrigation conditions and the degree was larger with heat waves. On the other hand, the CCI, correlated with photosynthesis efficiency, showed less sensitivity to water deficit but had decreased significantly with heat waves. After re-irrigation, the MTCI was increased than before damage and CCI became more sensitive to heat stress. These results are expected to contribute to evaluating the intensity of crop water stress through remote sensing techniques.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.7
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• pp.55-62
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• 2006

This thesis describes collision avoidance using fuzzy logic based on "Right of way" rules of ICAO and FAA and pilot's experiences for Unmanned Aerial Vehicle(UAV). To apply the rules, we designed fuzzy logic based collision avoidance system. And we also designed decision logic for enable condition of collision avoidance system. Decision logic have three kinds of core key, i.e. Relative Range, Time of CPA(Closest Point of Approach) and Distance at CPA. Application of decision logic made a possible to avoid NMAC(Near Mid-Air Collision) and it has been verified through several simulations. To conclude, we proposed the method to carry out "See and Avoid" ability on UAVs, which is capability to mingle with manned aircraft in civil airspace.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.67 no.3
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• pp.189-197
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• 2022

This study investigated the antioxidant and yield properties of eight adzuki bean (Vigna angularis L.) cultivars grown under different mean temperatures and sunshine hours in 2020 and 2021. Compared to 2021, which had a normal mean temperature, 2020 showed a lower mean temperature during the pod-extension and grain-filling periods. In addition, due to frequent rainfall during the vegetative period in 2020, there were fewer hours of sunshine in 2020 than in 2021. The adzuki bean yield was approximately 13% lower in 2020 than in 2021 due to the decreased number of pods per plant and 100-seeds weight. 'Hongda' and 'Hongjin' cultivars showed more stable yields than the 'Arari' variety, which is the most commonly cultivated variety in Korea. Moreover, the 'Hongda' and 'Hongjin' cultivars had higher yields than the 'Arari' variety in both years. Compared to 2021, in 2020, when the weather conditions were unfavorable, both antioxidant levels and activity were higher. 'Hongda' had higher antioxidant levels and activity than the other cultivars over the 2 years. These results suggest that the antioxidant levels and activity were good in 2020, with an approximately 13% decrease in yield compared to 2021, which was a normal year with respect to mean temperature and sunshine hours.

• Journal of Mushroom
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• v.21 no.4
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• pp.266-269
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• 2023

This study aimed to address the increasing demand for technologies preventing mushroom fly damage. By monitoring the annual occurrence patterns of pests over several years and accumulating data, we conducted an analysis to evaluate the efficacy of preventive measures applied before the surge in mushroom fly infestation, typically observed in May. For preemptive control, physical measures involved installing air curtains at cultivation facility entrances and placing sticky traps and insect traps around entry points to block external entry and reduce internal insect density. Additionally, we applied an organic agricultural material, Dalmatian chrysanthemum extract, weekly alongside chemical control measures. To assess the reduction in mushroom fly populations, yellow sticky traps (15×25 cm) were placed at three locations within the mushroom cultivation facility, and the occurrence patterns before and after implementing preventive measures were compared. Compared to conventional practices, the application of preventive techniques resulted in a significant reduction, with a 60% decrease from 15 levels of mushroom flies/m² to 6 levels of mushroom flies/m² in May and a 40% decrease from 10 levels of mushroom flies/m² to 6 levels of mushroom flies/m² in June. While achieving over 50% efficacy during the peak mushroom fly season with preventive measures, we identified complementary actions such as blocking external sources (gaps in cultivation facility doors) and maintaining cleanliness around cultivation facilities (proper disposal of spent substrate) for further improvement. Comprehensive analysis and safety studies, including correlation analysis with contaminants and pathogens, are recommended to ensure the widespread adoption of mushroom fly preventive techniques for safe and stable mushroom production in the agricultural sector.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.32 no.5
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• pp.340-350
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• 2020

A rapid refresh wave forecasting system has been developed using the sea wind on the Korea Local Analysis and Prediction System. We carried out a numerical experiment for wind-wave interaction as an important parameter in determining the forecasting performance. The simulation results based on the seasons of with typhoon and without typhoon has been compared with the observation of the ocean data buoy to verify the forecasting performance. In case of without typhoon, there was an underestimate of overall forecasting tendency, and it confirmed that an increase in the wind-wave interaction parameter leads to a decrease in the underestimate tendency and root mean square error (RMSE). As a result of typhoon season by applying the experiment condition with minimum RMSE on without typhoon, the forecasting error has increased in comparison with the result without typhoon season. It means that the wave model has considered the influence of the wind forcing on a relatively weak period on without typhoon, therefore, it might be that the wave model has not sufficiently reflected the nonlinear effect and the wave energy dissipation due to the strong wind forcing.

• Phonetics and Speech Sciences
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• v.12 no.2
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• pp.39-49
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• 2020

The prosody of children with autism spectrum disorders (ASD) has several abnormal features, including monotonous speech. The purpose of this study was to compare acoustic features between an ASD group and a typically developing (TD) group and within the ASD group. The study also examined audience perceptions of the lengthening effect of increasing the number of syllables. 50 participants were divided into two groups (20 with ASD and 30 TD), and they were asked to imitate a total of 28 sentences. In the auditory-perceptual evaluation, seven participants chose sentence types in 115 sentences. Pitch, intensity, speech rate, and pitch slope were used to analyze the significant differences. In conclusion, the ASD group showed higher pitch and intensity and a lower overall speaking rate than the TD group. Moreover, there were significant differences in s2 slope of interrogative sentences. Finally, based on the auditory-perceptual evaluation, only 4.3% of interrogative sentences produced by participants with ASD were perceived as declarative sentences. The cause of this abnormal prosody has not been clearly identified; however, pragmatic ability and other characteristics of autism are related to ASD prosody. This study identified prosodic ASD patterns and suggested the need to develop treatments to improve prosody.

• The Journal of Korean Philosophical History
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• no.53
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• pp.63-100
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• 2017

In this article, I researched Nam Dae-nyeon's(1887~1958) thought of Neo-confucian theories, interpretation of confucian canons, and evaluation of historical figures. First, from the side of Neo-confucian theories, he asserted that Qi(氣) had behaviors and Li(理) had not. About his teacher Jeon Wu's(田愚) theories, he thought that those were in tradition of Confucius(孔子) and Mencius(孟子), but not emphasized presidence of mind. And he criticized the theory of mind was Li(理). Second, from the side of interpretation of Confucian canons, Nam Dae-nyeon's study centered on Four Books(四書). This showed he was in tradition of Neo-confucianism. Through this studies he emphasized the importance of Confucian Ren(仁) and Filial piety(孝), self-consciousness as gentry(士). Third, from the side of evaluation of historical figures, Nam Dae-nyeon evaluated many Chinese and Korean scholars, for example, Qu Yuan(屈原), Lu Zhong-lian(魯仲連), Zhen De-xiu(眞德秀), Lu Long-qi((陸?其), Zhang Lu-xiang (張履祥) of China, and Jeong Mong-ju(鄭夢周), Zho Kwang-jo(趙光祖), Yi Hwang(李滉), Yi Yi(李珥), Jeon Wu(田愚) of Korea. And his criteria for evaluation of historical figures was fidelity and insight.

• Vending industry
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• v.8 no.3
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• pp.51-57
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• 2008

왜 자판기 커피가 못 마실 음료처럼 비난을 받아야 하죠? 일부 미니 커피자판기에 사용된 원료 문제를 마치 전체 자판기 문제인 냥 떠들어 때는 매스컴이 정말 원망스럽습니다. -자판기 운영업자 K씨- A급 원료를 쓰고 있는데도 불구하고 마치 죄인 마냥 '멜라민 커피프림을 쓰지 않는다'는 해명문구를 써서 부쳐야 하니 정말 열불이 나더군요." -자판기 운영업자 P씨- 올 가을은 그야말로 중국산 멜라민 파동이 식품 업계 전반이 휘몰아친 한해였다. 해태제과의 '미사랑 카스타드'로 불붙은 멜라민 파동은 제작 전반을 걸쳐 자판기 커피프림 분야로도 불똥이 튀었다. 식품의약품안전청은 중국산 커피프림 원료를 수입하는 3개 업체의 10개 제품을 조사한 결과, 유창FC의 '베지터블 크림 파우더 F25에서 멜라민 1.5ppm이 나왔다'고 밝혔다. 이 크림은 41톤이 수입되어 25톤이 시중에 팔려나갔으며, 주로 자동판매기용 믹스커피나 커피전문점에 사용한 것으로 보도가 되어 일파만파로 파문이 확산되었다. 대부분의 매스컴 보도는 '자판기 커피프림에 멜라민이 들어갔고, 그래서 마셔서는 안 된다'는 식으로 과당보도가 되다 보니 소비자들의 분노의 불신이 걷잡을 수 없이 커졌다. 이에 자판기 커피 매출을 뚝 떨어 졌고, 그 동안 애용했던 자판기 커피에 등을 돌리는 사람들이 많아 졌다. 마치 자판기 커피가 식품안전을 위협하는 원흉이나 되는 듯한 분위기였다. 그런데 이런 뜻하지 않은 악재가 자판기 업계로 보면 억울하기 그지없는 일이다. 이번에 문제가 된 것은 식당 등에 설치된 '미니 커피자판기' 일부에 해당되는데도 불구하고 매스컴 보도는 전체 자판기가 문제가 된다는 식이었다. 대다수의 매스컴이 미니 커피자판기와 대형 커피자판기를 구분하는 개념도 없다보니 문제가 없는 대형 자판기를 불똥이 튈 수밖에 없었다. 또한 미니 커피자판기에서 그런 원료가 투출되기 쉬운 열악한 사업특성에 대해서도 언급을 하지 않았다. 일부분의 문제를 '침소봉대'하여 전체의 문제인 것처럼 보도하는 매스컴의 무책임한 태도가 가뜩이나 어려운 자판기 산업계에 직격탄을 날렸다. 대다수의 자판기, 특히 대형자판기들은 억울하기 그지없는 일이다. 이번 커피자판기 멜라민 사태를 통해 과연 매스컴 보도가 무엇이 잘못되었고, 산업계에 어떠한 과제를 내던졌는지를 심층 진단했다.

• Journal of the Korean Geographical Society
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• v.39 no.4
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• pp.514-527
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• 2004

We investigated the distribution and geomorphic development of alluvial fans at Cheongdo- and Hweyang-eup(town) in the Cheongdo Basin, Gyeongsangbuk-do(Province) of Korea. The alluvial fans of study area are formed confluently to the E-W direction at the northern slope of the Mt. Namsan(840 m). They are classified into Higher surface, Middle surface, and Lower surface according to a relative height to a river bed. And the older alluvial fan is, the deeper gravel in the stream deposits is weathered. The magnitude of each surface composing of confluent fans is related to that of the drainage basin. So called fan-basin system of magnitude on the study area is on the positive(+) relation in the study area. The large fans over 1km in radius are found on the basin of andesite rock which is resistant to the weathering and erosion. Moreover there is no tectonic movement in the basin. It means the most important element influenced on the fan formation is not tectonic movement, but the Quaternary climatic change, which is the periglacial climate alternating glacial and interglacial stages during the Quaternary. Therefore alluvial fans would distribute in Korea overall influenced by the Quaternary climatic change.

• Journal of Practical Agriculture & Fisheries Research
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• v.20 no.1
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• pp.175-185
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• 2018

This study was conducted to evaluate the physiological and ecological characters of rice cultivars suitable for low fertilized condition. 5 rice cultivars(Jinmibyeo, Sobibyeo, Hwayeongbyeo, Nagdongbyeo and Junambyeo) were cultivated for selection under 3 different nitrogen application levels, and 1 cultivars were selected. The results obtained are summarized as follows ; High yielded rice cultivars under low N application level were Junambyeo, Jinheng and Sobibyeo. Also these cultivars were yielded highly under conventional level(11kg/10a). Milled rice yield under conventional level(11kg/10a) was positively correlated with them under low N levels. Milled rice yield was most affected by no. of grain/m². Rice cultivars that were high crop growth rate(CGR) before heading stage were Junambyeo, Sobibyeo and Nagdongbyeo. Grain filling rate was increased mostly until 20 days after heading, and decreased after this stage. Nitrogen use efficiency was higher under low N level(5.5kg/10a) than conventional level(11kg/10a). Especially, Junambyeo was most low in Apparent recovery of applied N(AR) under low N application level, but most high in Agronomic N use efficiency(ANUE). This characteristics of Junambyeo will to be useful for selection of variety suitable for growing under low fertilized condition.