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김재열,마상동,오성민,송경석,김양중,김창현,곽이구 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2
In this study, the researches classifying the natural flaws in welding parts are performed using the signal pattern classification method. For this purpose 500MHz storage digital oscilloscope including FFT function and enveloped waveform generator are used and the signal pattern recognition procedure is made up the digital signal processing, feature extraction, feature selection and classifier design. Specially it is composed with and discussed using the distance classifier is based in euclidean distance the empirical Bayesian classifier. In feature extracting, it is performed using the class-mean scatter criteria. And the signal Pattern classification method is applied to the signal pattern recognition problems of natural flaw that is porosity inclusion, slag inclusion, lack of penetration, lack of fusion. center crack, side crack, toe crack. root crack as the planar and volumetric flaw classification problem. According to this results, if appropriately learned the neural network classifier is better acquire the recognition rate of 86.31% above through it is different a little according to domain extracting the feature and the classifier
Yang Yeol Oh,Hee Kyoung Ock,Jin Hee Ryu,Su Hwan Lee,Hak Seong Lee,Kwang Seung Lee,Kang Ho Jung,Sung Yung Yoo,Tae Wan Kim,Kil Yong Kim 한국토양비료학회 2022 한국토양비료학회지 Vol.55 No.2
Agricultural production in Saemangeum reclaimed land is limited by low organic matter and nutrients content of soil, which lowers crops productivity. One of the best ways to improve soil properties and yield of upland crops are to increase soil organic matter by using organic amendments. To investigate effects of organic amendments on crop productivity and improvement in soil properties, we cultivated maize in an experimental field on Saemangeum reclaimed land with four treatments of compost and chemical fertilizer (FC), chemical fertilizer (F), control (C), and non-cultivation (N). The increments of organic matter (OM), available phosphate, calcium to potassium ratio (Ca/K ratio) was the greatest in FC treatment. Organic matter contents showed an increasing trend with the application of fertilizer and compost to the soil. The organic matter in the FC treatment increased to 6.29 g kg<SUP>-1</SUP>, the highest among the treatments. Available phosphate after the maize harvest was 33 mg kg<SUP>-1</SUP> in the F treatment and was highest in FC treatment, 255 mg kg<SUP>-1</SUP>. The Ca/K ratio in FC and C treatments increased to 4.39 from 2018 to 2020. On the other hand, application of only chemical fertilizer (F) did not affected soil properties. The yield of maize in FC treatment increased by 155% compared with that of control. It was concluded that compost contributed more than only chemical fertilizer in building up the organic matter, phosphorus, and Ca/K ratio status of the soil. Also, Application of chemical fertilizer combined with compost was favorable to increase the content of soil organic matter and available phosphate, and the maize productivity.
자귀풀(Aeschynomene Indica L.) 종자의 휴면타파 처리가 발아에 미치는 영향
오양열 ( Yang-yeol Oh ),이수환 ( Su-hwan Lee ),김영주 ( Young-joo Kim ),정진태 ( Jin-tae Jeong ),류진희 ( Jin-hee Ryu ),김선 ( Sun-kim ),정진 ( Jin-jung ),배희수 ( Hui-su Bae ),이상훈 ( Sang-hun Lee ),김영두 ( Young-doo Kim ),홍하 한국국제농업개발학회 2015 韓國國際農業開發學會誌 Vol.27 No.5
간척지에서 자생하는 자귀풀은 콩과잡초로서 휴먼성이 강하고 종피가 딱딱한 껍질에 싸여있어 채종한 종자는 발아율이 저조하므로 발아율을 높이기 위하여 황산, 온도 및 모래를 을 이용한 종피파상 방법을 이용한 휴면타파 효과를 구명하기 위하여 본 시험을 수행하여 그 결과는 다음과 같다. 1. 2013년도 간척지에서 채종한 자귀풀 발아세와 발아율은 18.0%와 27.0%, 2014년 채종 종자는 15.8%와 21.5%을 보였다. 2. 자귀풀 종자의 황산처리효과는 황산용액 50% 처리에서는 무 처리와 큰 차이를 보이지 않았지만, 황산용액 100% 처리에서는 채종 연도와 관계없이 71.0% ~ 73.0%의 발아율을 나타내었다. 3. 온도처리 효과는 90oC 고온 상태에서 각각 20, 30, 40분처리시의 발아율은 처리시간 40분에서 90% 이상의 높은 발아율을 보여 처리시간이 길어질수록 발아율은 증가할 것으로 사료된다. 4. 모래를 이용한 종피파상 처리는 2014년 채종한 종자는 종자량과 모래의 비율이 4배 처리에서 94.0%로 가장 높은 발아율을 보였고, 2배 처리에서도 80%의 발아율을 나타내었다.이상의 결과를 종합하면 간척지에서 채종한 자귀풀의 휴면타파는 많은 노력이나 시설 및 비용이 추가되는 온도처리나 황산처리보다 주변에서 쉽게 구할 수 있는 모래를 이용한 종피파상법이 좋을 것으로 사료된다. Saemangeum reclaimed tidal land has a variety native plants and a vegetation species. Using of growing plants on reclaimed tidal land have being studied actively to improve soil fertility. This study was conducted to increase the germination rate of indian jointvetch (Aeschynomene Indica L.). seeds were kept to soak in sulfuric acid solution of 50%, and 100% conc. for 10 min. and also temperature condition test was carried with tem. of 90oC and treatment times 20, 30, 40 min. in dry oven(DS-80-3). Scarification test of mixed ratio with seed and sand was done such as 1 (seed) : 2 (sand), 1 : 4, and, 1 : 6 for scratch into surface of seed. seed and sand ratio of 1 : 4 in the germination rate was the higher by 94% than others. Germination rate of temperature condition showed much more 90% at 90oC, and for 40min treatment. Germination rates in sulfuric acid solution of 50% conc. and for 10 min. showed at 26% in 2013, and 21% in 2014. As the result, Indian jointvetch (Aeschynomene Indica L.). seeds collected in the reclaimed land could improve the germination rate using sand around reclaimed land.
새만금간척지에서 뚱딴지(Helianthus tuberosus L.) 재배시 염류 특성 변화 및 적정 자원 선발
오양열 ( Yang-yeol Oh ),이정태 ( Jung-tae Lee ),홍하철 ( Ha-cheol Hong ),김재현 ( Jae-hyun Kim ),서우덕 ( Woo-duck Seo ),김선 ( Sun Kim ),류진희 ( Jin-hee Ryu ),이수환 ( Su-hwan Lee ),김영주 ( Young-joo Kim ) 한국환경농학회 2018 한국환경농학회지 Vol.37 No.2
2016년 한국에서 재배 및 유통되고 있는 뚱딴지 12점을 수집하여, 새만금간척지에 재배하였다. 간척지 적응성을 검토한 결과 다음과 같은 결론을 얻을 수 있었다. 1. 뚱딴지를 간척지에 재배하였을 때, 간척지 특성상 0.3% 이상일 때 밭작물 재배가 어려운데, 개화 전 8월 가뭄으로 인하여 토양 염농도가 전체적으로 0.3%이상 올라갔음에도 초장 및 수량으로 보았을 때 높은 염농도에 대한 적응성이 있는 것으로 판단된다. 2. 개화기 무렵 꽃이 50%이상 피었을 때 뚱딴지 초장을 조사한 결과 WY3와 WI1가 207 cm, 202 cm로 가장 컸으며 WG1, WH1, PS1 144 cm, 139 cm, 131 cm로 가장 작았다. 3. 11월 뚱딴지를 수확하여 수량을 확인한 결과 흰색 뚱딴지는 WG1이 549 kg/10 a, WH1이 477 kg/10 a로 가장 많은 수량을 나타내었으며, 자색 뚱딴지에서는 PY4와 PY1이 각각 10 a당 615 kg, 584 kg로 우수한 수량을 보였다. 4. 수집한 뚱딴지 12점의 이눌린 함량을 분석한 결과 PY1이 33.9 g/100 g으로 가장 많은 이눌린 함량을 보였으며, 다음으로 D2가 33.7 g/100 g으로 많았다 결론적으로 내염성이 우수한 뚱딴지가 간척지에서도 적응할 수 있는 것으로 판단되며, 수집 뚱딴지 중 흰색은 수량 및 이눌린함량을 고려하여 G1이 간척지에 적합할 것으로 보이며, 자색은 Y1이 이눌린함량이 두 번째로 많지만, 수량과의 관계를 고려할 때 간척지에서 재배하는데 더 적합한 것으로 판단된다. 각각 색깔별로 우수한 뚱딴지 2점을 가지고 내염성 및 간척지 재배법에 대한 연구가 더욱 필요할 것으로 보인다. BACKGROUND: Soil salinity of reclaimed tidal land in Korea is highly important factor. High salinity is harmful to crop productivity. Jerusalem artichoke (Helianthus tuberosus L.) is known to be salt-tolerant and has high adaptability to diverse pedo-climatic conditions. The objective of this study was to assess the changes of soil properties and crop productivity according to salt concentration in the reclaimed tidal lands. METHODS AND RESULTS: Experimental sites were selected at Saemangeum (35°46’N, 126°37’E) reclaimed tidal land, and their dominant soil series were Munpo (coarse loamy, mixed, non-acid, mesic, typic Fluvaquents). H. tuberosus L were collected from 12 locations across Korea. Tubers were planted at 75×25 cm with EC 2 to 7 dS m<sup>-1</sup>. Soil samples were periodically collected from both 0~20 cm and 20~40 cm depths of each site. Soil salinity and soil moisture contents were varied depending on weather conditions. Soil electrical conductivity varied from 1.0 to 5.9 dS m<sup>-1</sup>, and soil moisture contents varied from 9.2 to 28.7%. The white-colored tubers of H. tuberosus L. collected from `Yeongwol-gun’exhibited the highest height (207 cm), followed by the white-colored tubers of H. tuberosus L. collected from‘Iksan-si’(202 cm). The white-colored tubers of H. tuberosus L. collected from ‘GyeongJu-si’showed the highest yield (549 kg/10a). The purple-colored tubers of H. tuberosus L. collected from ‘Yeongwol-gun’showed the highest yield (615 kg/10a). CONCLUSION: Our results indicate that the plant height and tuber yield did not appear to be correlated. Considering yield and inulin content, the GyeongJu-si seemed to be suitable as the white-colored tubers of H. tuberosus L. and the Yeongwol-gun seemed to be suitable as the purplecolored tubers of H. tuberosus L. in the reclaimed tidal lands. However, it is necessary to consider the relationship between the inulin content and the yield.