• The Korean Journal of Pesticide Science
• /
• v.18 no.2
• /
• pp.53-60
• /
• 2014

This study was conducted to investigate the changes of the residual amount in the leafstalk (end) and the fore-end (upper) portion of lettuce leaves during cultivation period to 14 days, 12 times in total (0, 1, 2, 3, 4, 5, 7, 8, 10, 12, 13 and 14 days) after spraying with boscalid and lufenuron. In the case of boscalid, the initial concentrations at 3 hours (0 day) of the leafstalk and the fore-end portion of lettuce leaves were 18.26 mg/kg and 84.97 mg/kg, respectively and the residual amounts were rapidly decreased to 0.31 mg/kg and 0.37 mg/kg at 14 days after chemical application. In the case of lufenuron, the initial concentrations at 3 hours (0 day) of the leafstalk and the fore-end portion of lettuce leaves were 0.91 mg/kg and 5.21 mg/kg, respectively and the residual amounts were rapidly decreased to 0.06 mg/kg and 0.09 mg/kg at 13 days after chemical application. The variations of the residual concentrations analyzing 12 times after spraying showed that the residual amounts of the leafstalk portion of lettuce leaves were less than its fore-end portion in boscalid and lufenuron. In additon, 9 kinds of pesticide including boscalid in 16 lettuce leaf (found to contain pesticide in 2013) showed that the residual amounts of the leafstalk portion of lettuce leaves were less than its fore-end portion as well.

• Journal of Food Hygiene and Safety
• /
• v.30 no.2
• /
• pp.196-201
• /
• 2015

This study was conducted to monitor the current status of pesticide residues and to calculate the correlation between monthly price fluctuation and distribution of pesticide residues in leafy vegetables at the whole market in Gyeonggi-do from 2009 to 2013. From the result, the maximum residue limit (MRL) were frequently exceeded in 5 leafy vegetables which were 48 cases of crown daisy (5.8%), 28 cases of chard (5.1%), 28 cases of spinach (3.4%), 25 cases of perilla leaves (3.4%) and 24 cases of chamnamul (3.7%). The high rate of monthly pesticide residues exceeding MRL showed on crown daisy and chard observed in June and September, spinach in October to November and December to January, perilla leaves in July to August and January, and chamnamul in August to September. To calculate the correlation between monthly price fluctuation and distribution of pesticide residues, we performed the Pearson's correlation analysis. From the results, there were significant differences between monthly price and pesticide residues detected in chamnamul, spinach and perilla leaves (p < 0.05). There were also significant differences between monthly price and pesticide residues exceeding MRL in chamnamul and crown daisy (p < 0.05). Although the small number of leafy vegetables and short period were analyzed in this study, the consolidation monitor of pesticide residues according to the season and price will be needed to acquire the safety of agricultural products.

• Journal of Food Hygiene and Safety
• /
• v.34 no.2
• /
• pp.191-198
• /
• 2019

This study investigated the residual characteristics of bifenthrin and chlorothalonil in crown daisy and suggested pre-harvest residue limits (PHRLs) based on their dissipation patterns and biological half-lives. The samples for residue analysis were harvested at 0 (3 hr), 1, 3, 5, 7, 9, 11, 13, 15, 18, 22 and 26 days after treatment, and analyzed by $GC/{\mu}-ECD$ and TOF/MS. The limit of quantitation (LOQs) of bifenthrin and chlorothalonil were 0.0046 mg/kg and 0.0007 mg/kg, respectively. Recoveries ranged from $88.67{\pm}7.97%$ and $99.90{\pm}16.03%$, showing that this method is appropriate for the analysis of the pesticide residues in crown daisy. Being well within first order kinetics, the biological half-lives of the pesticide residues in crown daisy were 9.63 days for bifenthrin and 6.54 days for chlorothalonil. The PHRLs of bifenthrin and chlorothalonil were recommended as 11.70 mg/kg and 24.10 mg/kg for 26 days before harvest, respectively.

• 한국문화재보존과학회:학술대회논문집
• /
• 2005.03a
• /
• pp.24-27
• /
• 2005

• Journal of the korean veterinary medical association
• /
• v.15 no.9_10
• /
• pp.497-504
• /
• 1979

1. Incidence rate of bovine tuberculin reaction dairy cattle in 1971 was $0.20\%$ and then reduced somewhat in 1972 to $0.04\%$, but increased up to $0.16\%$ in 1977 and to $0.15\%$ in 1978. Average incidence fo

• Journal of the korean veterinary medical association
• /
• v.19 no.7
• /
• pp.39-44
• /
• 1983

A Total of 15 cows with 26 Quarters affected with chronic mastitis in Anyang Area were used in this experiment. Levamisole was effective against chronic bovine mastitis by enhancing the immune response in cows. 1. Levamisole treatment was $65.0\%$

• 한국문화재보존과학회:학술대회논문집
• /
• 2007.10a
• /
• pp.91-93
• /
• 2007

• Proceedings of The KACE
• /
• 2017.08a
• /
• pp.193-195
• /
• 2017

목욕탕, 호텔과 같이 다량의 수건이 사용되는 곳은 빠르게 수건을 개기 위해서 수건을 접는 로봇을 사용한다. 그러나 기존의 수건을 접는 로봇은 사람이 수건을 일일이 일정한 형태대로 정렬을 해주어야 하고 복잡한 구조로 인해 부피가 크다는 단점이 존재한다. 본 연구에서는 기존의 수건 접는 로봇보다 구조가 간단하고 부피가 작으며, 임의로 투입된 수건을 자동으로 정렬하는 로봇을 개발하였다. 특히 랙과 피니언을 이용한 수직운동과 컨베이어 벨트의 수평운동을 이용한 수건 접기 방식을 통해 로봇의 부피를 획기적으로 줄일 수 있었다. 또한 영상처리 과정을 통해 수건의 각 꼭짓점의 좌표를 실시간으로 트래킹 하여 모든 수건 접기 과정을 자동화하였다. 본 연구의 결과로서 강체가 아닌 유동성을 가진 수건을 정렬하는 방법을 개발하였으므로 향후 연구를 통해 여러 가지 물체들을 정렬하는데 응용될 수 있을 것이라 기대된다.

• Proceedings of The KACE
• /
• 2017.08a
• /
• pp.189-192
• /
• 2017

던지기는 시간 효율이 높은 물체 수송 방법이나 그 정확성을 위해서는 다양한 물리적인 변인들을 고려해야 한다. 따라서 본 연구에서는 정확한 던지기에 영향을 주는 변인들을 설정하여 물체를 정확하게 던지는 해를 찾는 유전 알고리즘을 설계하고, 이를 4자유도 로봇팔에 적용시켰다. 하드웨어는 TETRIX와 EV3 플랫폼을 이용하여 설계하였고, 소프트웨어는 LabVIEW 2014를 이용하여 구현하였다. 또한 물체가 던져질 때마다 위치와 각 변인들의 값을 수집하고, 이를 통계적으로 분석하여 던지기의 정확성에 대한 각 관절의 기여도를 분석하였다. 본 연구의 결과는 물체를 정확히 던지는 기계를 설계하거나 사람의 던지는 동작을 이해하는 데 도움이 될 것으로 기대된다.

• Economic and Environmental Geology
• /
• v.21 no.4
• /
• pp.349-358
• /
• 1988

K-Ar ages were determined on gangue and wall rock alteration minerals from twenty metallic mineral deposits in the Gyeonggi Massif. Beryl deposits give the age of 185 Ma, whereas tungsten - molybdenum deposits reveal two different age groups such as 172~156 Ma and 91~86Ma. Lead - zinc deposits and gold - silver deposits yield the ages of 160 Ma and 71~197 Ma, respectively. Mineralization ages for each genetic type of deposits in the Gyeonggi Massif can be summarized as follows; pegmatite deposits, 185 Ma; skarn deposits, 156~160 Ma; hydrothermal deposits, 71~197 Ma. Present results together with data previously reported reveal that rare earths, tungsten-molybdenum, base and precious metal deposits in the Gyeonggi Massif were formed in Jurassic and Cretaceous time with a genetic relationship to the Daebo and Bulguksa felsic igneous activity.