The Fate of <SUP>15</SUP>N-labeled Organic Materials Applied to Chinese Cabbages Cropping System

Cho-Rong Lee,Yura Oh,Bi-Na Song,Jung A Jung,Jeong-Lai Cho,Sang-Min Lee,Nan-Hee An 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.1

Nitrogen added to farmland is used to plants or remains in soil, or is lost to environment. We incorporated <SUP>15</SUP>N-labeled materials (Chemical fertilizer (CF), green manure (GM), livestock compost (LC), GM+LC, and oil cake (OC) to soil and cultivated Chinese cabbages (Brassica rapa subsp. pekinensis) and analyzed the <SUP>15</SUP>N recovery of crop and soil to investigate the fate of nitrogen. The results follow. The <SUP>15</SUP>Ncrop recovery of chemical fertilizer (CF) was the highest, and that of organic materials differed by type. The <SUP>15</SUP>Nsoil recovery of CF was the lowest, and that of organic materials was 3 - 6 times higher than CF. The <SUP>15</SUP>Nloss was not significantly difference between CF and organic materials (except GM+LC). As results, despite of the same amount of nitrogen input, there was the difference in plant uptake and soil residue between organic materials and CF. Nitrogen of CF is used to Chinese cabbages more than organic materials, however most of the remaining nitrogen is estimated to be lost to the environment. Therefore, CF might be hard to occur residual effect in the next cropping season. In organic materials, nitrogen is less used to Chinese cabbages than CF, but remains in soil more than CF. Therefore, organic materials might be useful for improving soil fertility and have a residual effect in the next cropping season. We suggest that these properties of organic materials should be taken into account in calculating the amount of applied fertilizer in organic farming where mainly organic materials are used. Moreover, it is necessary to investigate the cumulative and residual effects of continuous input of the same organic materials.

The Effects of Barley-Hairy Vetch Mixtures on Green Manure Productivity and Soil Phosphorus Solubilization

Cho-Rong Lee,Kwang-Lai Park,Jeong-Lai Cho,Yura Oh,Sang-Min Lee,Nan-Hee An 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.2

Soil phosphate accumulation has been problems in some organic farmlands in Korea. This study was conducted to solubilize the accumulated phosphate in organic upland soils using green manure mixtures as substitute for chemical materials (EDTA etc.). We investigated the effects of barley-hairy vetch mixtures on the productivity of biomass and nutrient and the solubilization of soil phosphate. Treatments were barley single (B), hairy vetch single (H), mixtures of B and H at the ratio of 2:1 (B2H1), 1:1 (B1H1), 1:2 (B1H2), and control (CON). Green manures were cultivated on phosphate accumulated soils (>1,000 mg Lancaster P₂O₅ kg<SUP>-1</SUP>) for 3 years. Mixtures were more effective for stable production of yields and nutrient than B or H, because dry matter yields of green manures were more variable in B and H single. The quality of B as green manure improved in mixtures, because the C/N ratio of B in mixture increased less than B single. In addition, H was effective for phosphate solubilization, as water soluble phosphate contents of H single (2017 and 2019) and mixtures (2019) were significantly higher than B single (2017 and 2019) and CON (2019) despite of phosphate uptake by green manures. Therefore, barley-hairy vetch mixtures could be useful considering green manure productivity and phosphate solubilization in phosphate accumulated upland soils.

Effects of Green Manure-Maize Rotation on Phosphorus Uptake of Crop and Decrease in Phosphorus Accumulation in Organic Upland Soil

Cho-Rong Lee,Yura Oh,Kwang-Lai Park,Jeong-Lai Cho,Nan-Hee An,Sang-Min Lee 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.3

Phosphorus (P) easily accumulates in farmland soil due to their high affinity to cations and clay, and thus their use efficiency of crop is low. Green manure-maize rotation system might be an efficient measure to reduce P accumulation in organic farmland by improving P uptake of crops. This study was conducted to investigatethe effects of green manure-maize rotation on P uptake of maize and excess P removal in organic upland soils. Maize mono cropping and green manure-maize rotation systems (barley (B), hairy vetch (H), mixture of B and H) were established in organic farmland, and the experiments were conducted for 2 years without additional nutrients application. Green manure had a significant impact on maize grain production. Maize P uptake increased with the increased rate of hairy vetch seeding. Water soluble P content in soil was further reduced in green manure-maize rotation systems compared to the mono cropping. The results suggest that green manure-maize rotation system (except barley) without nutrient supplement increases P uptake of maizeand thus decreases soil P accumulation.

Effects of cycloaliphatic diols on the crosslinked polyurethane elastomers

Cho Rong Oh,Dai Soo Lee 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2

The Fate of 15N-labeled Organic Materials Applied to Chinese Cabbages Cropping System

Cho-Rong Lee,Yura Oh,Bi-Na Song,Jung A Jung,Jeong-Lai Cho,Sang-Min Lee,Nan-Hee An 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.1

Nitrogen added to farmland is used to plants or remains in soil, or is lost to environment. We incorporated15N-labeled materials (Chemical fertilizer (CF), green manure (GM), livestock compost (LC), GM+LC, andoil cake (OC) to soil and cultivated Chinese cabbages (Brassica rapa subsp. pekinensis) and analyzed the 15Nrecovery of crop and soil to investigate the fate of nitrogen. The results follow. The 15Ncrop recovery ofchemical fertilizer (CF) was the highest, and that of organic materials differed by type. The 15Nsoil recovery ofCF was the lowest, and that of organic materials was 3 - 6 times higher than CF. The 15Nloss was not significantlydifference between CF and organic materials (except GM+LC). As results, despite of the same amount ofnitrogen input, there was the difference in plant uptake and soil residue between organic materials and CF. Nitrogen of CF is used to Chinese cabbages more than organic materials, however most of the remainingnitrogen is estimated to be lost to the environment. Therefore, CF might be hard to occur residual effect in thenext cropping season. In organic materials, nitrogen is less used to Chinese cabbages than CF, but remains insoil more than CF. Therefore, organic materials might be useful for improving soil fertility and have a residualeffect in the next cropping season. We suggest that these properties of organic materials should be taken intoaccount in calculating the amount of applied fertilizer in organic farming where mainly organic materials areused. Moreover, it is necessary to investigate the cumulative and residual effects of continuous input of thesame organic materials.

복음 낭독에서 /에/와 /애/의 변별성에 관한 음향학적 연구

오초롱(Cho Rong Oh),염철호(Cheol Ho Youm),권순복(Soon Bok Kwon) 한국언어치료학회 2013 言語治療硏究 Vol.22 No.2

This paper is an acoustic research of whether priests, working in Gyeongsangnamdo and Busan, can distinguish two Korean single vowels, ‘ne’ and ‘nae,’ in a gospel reading, and of whether their audiences can hear them distinctively. The objects for the research of speakers' distinctiveness were 21 priests, the alumni of Catholic University of Pusan, and those for the audiences' distinctiveness were 20 lay believers in Gyeongsangnamdo and Busan. As for speakers’distinctiveness, F1, F2, and vowels' length of the two vowels were analyzed by Praat for windows. A paired t-test was used to compare the two vowels. The audience's ability to listen distinctively were surveyed through a questionnaire. The results show that the more familiar the text is, the more easily can the two vowels be distinctively pronounced. This result is due to intentional attempts to distinguish the two vowels. As for the audience's distinctiveness, the more familiar the text is, the more easily can the two vowels be distinguished.

중국인 한국어 학습자와 한국인의 한국어 단모음에 관한 음향학적 특성 비교

오초롱(Cho Rong Oh),권순복(Soon Bok Kwon) 한국언어치료학회 2013 言語治療硏究 Vol.22 No.1

The purposes of this study are 1) to compare acoustic phonetic features of Korean single vowels pronounced by Chinese-Korean learners with those of Korean pronounced by Koreans; 2) to analyze these features more scientifically and more objectively using Praat; 3) to analyze pronunciation gathered by the experiment basing on independent t-tests; and 4) to compare the vowel space between the two groups. In this study, the researcher use Praat to analyze F1 and F2 on Korean vowels which are pronounced by Chinese-Korean learners and Koreans and then calculate the vowel space. It was found that Chinese-Korean learners pronounced Korean vowels higher and more frontal than Koreans. In addition, Chinese-Korean learners could not distinguish the phonetic values between /u, o, ǝ, Ɯ/, likely because there are no such monophthongs (/ǝ, Ɯ/) in Chinese. Second, due to the different study period, male Chinese-Korean learners pronounced Korean single vowels more accurately than females. According to study level, the higher the subjects' study level was, the more accurate the pronunciation was and the wider the vowel space was. There is a high demand of cooperation between Korean education and speech-language pathology. In this situation, this study can be a meaningful basic material. In addition, this study can propose an method to teach Korean vowels to Chinese-Korean learners.

자연주의 희곡 기반 무용공연『미스 줄리(Miss Julie)』의 미적특성 연구

오초롱 ( Cho Rong Oh ) 한국무용연구학회 2014 한국무용연구 Vol.32 No.2

시대에 따른 예술사조의 개념변화는 무용의 표현수단에도 거듭나는 발전을 시도하도록 만들었다. 이러한 사회의식의 변화는 무용 창작자에게도 타 장르와 테크놀로지가 혼합된 형태의 새로운 장르를 형성하도록 하였으며, 이는 무용분야에 있어서 마치 ‘양날의 검’과도 같다는 생각을 한다. 이에 본 연구는 앞에서 언급한 발전 양상의 긍정적인 측면보다는 무분별한 매체의 사용으로 인해 무용의 본질이 퇴색되는 문제를 초점으로 시작하게 된 것이다. 따라서 연구의 대상은 무대상연화를 목적으로 하는 희곡인 스트린드베리의 자연주의 희곡『미스 줄리(Miss Julie)』로 정하였으며 이는 희곡이 무대상연화를 목적으로 하는 문학이니만큼 무용창작자에게 안무의도를 명확히 제시해주어 표현방식에 대한 객관적인 틀을 마련해 줄 것으로 생각했기 때문이다. 본 연구는 1차적으로 희곡『미스 줄리』에 나타난 미적특성을 비극성, 상징성, 추상성으로 추출하였다. 그리고 2차적으로는 앞에서 추출한 3가지의 미적특성이 잘 나타난 무용공연의 사례를 희곡『미스 줄리』대본과 비교·분석하면서 심층적으로 살펴보았다. 희곡을 활용한 본 연구는 희곡과 실제 공연사례를 분석하여 무용작품으로 형상화되는 방법을 모색하게 하는 것에 의의가 있으며 무용분야에서 스트린드베리의 희곡 『미스 줄리』의 미적특성을 집약적으로 연구한 최초의 사례가 되므로 향후 희곡분석과 연계된 안무방법을 학문화하는데 도움이 되길 바란다. Changes in the concept of art movements of the times allowed dance produced to form a new genre by means of technologies combined with other genres, which seemed like ‘a double-edged sword’ in the field of dance. Accordingly, this study started focusing on the issue that the essence of dance fades due to rash uses of media rather than on the positive side of the changes. Thus, this study chose Strindberg’s play Miss Julie as its subject because a play was literature aiming at staging, which could provide dance producers with an objective framework for the method of expression. The process of the study included: first, it extracted aesthetic characteristics such as tragedy, symbolism and abstractness shown in the play. Second, it carried out a comparative analysis and inquiry into cases of dance performance that showed three points extracted above well with the script of the play. This study had significance that it analyzed the play and the actual cases of performance and sought a method of giving shape to that on the stage, which became the first instance of intensive research of aesthetic characteristics of the play Miss Julie in the dance field, so it was desirable that, this would be helpful for scientific studies of choreography method.

내시경초음파 유도하 세침흡인술로 진단한 폐암으로 오인된 복강 내 폐흡충증

오초롱 ( Cho Rong Oh ),김미진 ( Mi Jin Kim ),이광혁 ( Kwang Hyuck Lee ) 대한소화기학회 2015 대한소화기학회지 Vol.66 No.1

Paragonimiasis has been continuously decreasing in Korea. However, it still occurs by ingesting raw or incompletely cooked fresh water crab or crayfish. The diagnosis of paragonimiasis is challenging because of its rarity. It may be confused with other inflammatory disease or carcinomatosis. Endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) has lower risk of complications such as bleeding, perforation than percutaneous fine needle aspiration. EUS-FNA is more accurate and popular method to find mucosal or submucosal tumors and the lesions of several organs. Benign and malignant tumors, infectious diseases have been diagnosed by EUS-FNA, but there was no report describing the use of EUS-FNA for diagnosing paragonimiasis. Herein, we present a 47-year-old male patient with paragonimiasis diagnosed by EUS-FNA. Imaging studies revealed mass lesions in the lung and peritoneal cavity, which was eventually confirmed as paragonimiasis using EUS-FNA. (Korean J Gastroenterol 2015;66:41-45)

Residual Effects of Organic Materials on N Supply to Chinese Cabbage and Soil Under Continuous Cultivation

Cho-Rong Lee,Yura Oh,Jung A Jung,Sang-Min Lee,Nan-Hee An 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4

Nitrogen (N) supply from organic materials (OM) takes more time than chemical fertilizer (CF), because mineralization of organic N requires microbial conversion. Most organic N applied to soil remains into SOM. It might have a greater residual effect than CF on soil fertility and crop nutrient uptake and influence on N fate. Residual organic N might have influence on soil fertility and nutrient uptake of crop by depending on N cycling in soil. This study investigated the residual effect of <SUP>15</SUP>N-labeled organic materials on Chinese cabbage N uptake and soil N. <SUP>15</SUP>N-labeled organic materials at rate of 456 ㎏ N/ha applied with green manure (GM), livestock compost (LC), GM+LC, oil cake (OC), and CF into wagner pot (1/2000a) for Chinese cabbage cultivation. During continuous crop cultivation (Sep. 2018 to Mar, 2020), <SUP>15</SUP>N-labeled Chinese cabbage and soil was analyzed by using stable isotope elemental analyzer. Organic materials and chemical fertilizer were higher N uptake in Chinese cabbage than in the control at first cropping season. However, N uptake of Chinese cabbage under continuous cultivation was significantly increased 35-72% at organic material treatments compared to the control. Also, <SUP>15</SUP>N-labeled soil was significantly high at the treatments applied with GM, LC, and GM+LC, but was not at OC and CF treatment. In conclusion, organic materials (especially GM, LC, and GM+LC) had a greater N residual effect on Chinese cabbage and soil than chemical fertilizer.