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Point Cloud Segmentation of Crane Parts Using Dynamic Graph CNN for Crane Collision Avoidance
Hyeonho Jeong,Hyosung Hong,Gyuha Park,Mooncheol Won,Mingyu Kim,Hoyeong Yu 한국정보과학회 2019 Journal of Computing Science and Engineering Vol.13 No.3
In this study, we have developed a point cloud segmentation algorithm for a collision avoidance system between cranes and other objects in construction yards. We used the Dynamic Graph CNN (DGCNN) algorithm to segment the point cloud of the entire yard into crane parts and backgrounds. The point cloud data were obtained from several LIDAR sensors attached to the crane. All points were grouped into specific core clusters using the DBSCAN algorithm. The core clusters were used to train the DGCNN after labeling with corresponding part names. This network classified the point cloud into crane types and their part names. Experimental results show that the crane part segmentation performance of the suggested algorithm is accurate enough to be used for collision avoidance system. It is possible to estimate the pose of a crane by comparing the segmented point clouds with those of the CAD model.
Design and Control of Levitation and Guidance Systems for a Semi-High-Speed Maglev Train
Kim, Min,Jeong, Jae-Hoon,Lim, Jaewon,Kim, Chang-Hyun,Won, Mooncheol The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
Research on Maglev (Magnetic Levitation) train is currently being conducted in Korea, concerning Urban Transit (110 km/h of maximum speed), semi-high-speed (200 km/h of maximum speed), and high-speed (550 km/h of maximum speed) trains. This paper presents a research study on the levitation and guidance systems for the Korean semi-high-speed maglev train. A levitation electromagnet was designed, and the need for a separate guidance system was analyzed. A guidance electromagnet to control the lateral displacement of the train and ensure its stable operation was then also designed, and its characteristics were analyzed. The dynamic performance of the designed levitation and guidance electromagnets was modeled and analyzed, using a linearized modeling of the system equations of motion. Lastly, a test setup was prepared, including manufactured prototypes of the designed system, and the validity of the design was verified and examined with performance evaluation tests.
Design and Control of Levitation and Guidance Systems for a Semi-High-Speed Maglev Train
Min Kim,Jae-Hoon Jeong,Jaewon Lim,Chang-Hyun Kim,Mooncheol Won 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
Research on Maglev (Magnetic Levitation) train is currently being conducted in Korea, concerning Urban Transit (110 km/h of maximum speed), semi-high-speed (200 km/h of maximum speed), and high-speed (550 km/h of maximum speed) trains. This paper presents a research study on the levitation and guidance systems for the Korean semi-high-speed maglev train. A levitation electromagnet was designed, and the need for a separate guidance system was analyzed. A guidance electromagnet to control the lateral displacement of the train and ensure its stable operation was then also designed, and its characteristics were analyzed. The dynamic performance of the designed levitation and guidance electromagnets was modeled and analyzed, using a linearized modeling of the system equations of motion. Lastly, a test setup was prepared, including manufactured prototypes of the designed system, and the validity of the design was verified and examined with performance evaluation tests.
PARK, KYUNG MIN,JEONG, MOONCHEOL,PARK, KEE JAI,KOO, MINSEON ational Association for Food Protection 2018 Journal of food protection Vol.81 No.10
<B>ABSTRACT</B><P>Bacillus cereus has long been recognized as an important pathogen in foodborne poisoning worldwide. Fresh vegetables are often contaminated with enterotoxigenic B. cereus and have been implicated as a vehicle for the transmission of this bacterium. This study reports on the occurrence, virulence gene profile, and antibiotic resistance of B. cereus in fresh vegetables. Of 102 examined samples, 48 (47%) of the samples were contaminated with B. cereus (>1 log CFU/g) and 7 (6.8%) of the samples showed more than 3 log CFU/g. In total, 118 B. cereus isolates were examined for the virulence genes nheA, nheB, nheC, hblA, hblC, hblD, cytK, and entFM and for resistance to antibiotics. Of these B. cereus isolates, 70% harbored nheA, nheB, nheC, and cytK. Eighteen (80%) of 21 isolates from bell peppers possessed eight enterotoxin genes. B. cereus isolates were susceptible to imipenem, vancomycin, gentamicin, erythromycin, ciprofloxacin, and chloramphenicol, whereas 22.4% of isolates from garlic chives, 48.7% from perilla leaf, and 40.5% from romaine lettuce showed antibiotic resistance to rifampin and 6% of isolates from garlic chives exhibited resistance to tetracycline. Three isolates from garlic chives were resistant to both tetracycline and rifampin. Raw vegetables were revealed to be major sources of B. cereus containing multiple toxin genes and exhibiting antibiotic resistance. Therefore, the potential health risks of consuming these vegetables raw or undercooked should not be underestimated. This study provides basic information for monitoring the antibiotic resistance and toxigenicity of B. cereus in the food chain during vegetable distribution and for developing food safety management to reduce the contamination with and transmission of B. cereus.</P>
가스충전 포장에 따른 신선편이 결구상추의 갈변 및 품질 특성
정주연(Joo-Yeoun Jung),신세희(Se-Hee Shin),최정희(Jeong-Hee Choi),정문철(Mooncheol Jeong) 한국원예학회 2008 원예과학기술지 Vol.26 No.4
신선편이 결구상추의 가스충전포장 시 가스조성이 품질에 미치는 영향을 조사하기 위하여 CO₂:O₂의 비율을 10:5, 25:20, 50:20 등의 농도로 OPP포장지에 가스충전 포장한 결구상추를 0:21의 대조구와 함께 5℃에 저장하면서, 포장지내의 CO2농도, PAL, PPO활성, 갈변도, 경도 및 관능특성의 변화를 조사하였다. 각 포장방법별 포장지내의 CO₂농도는 대조구에서 저장말기인 20일경 약 110% 증가한 반면 10:5의 가스충전포장에서는 약 8.32%가 증가율로서 신선편이 결구상추의 호흡률을 억제하는 효과가 있었다. 가스충전포장은 저장 중 PAL활성, PPO활성 및 갈변도의 변화를 대조구보다 억제하는 효과가 뚜렷하여 가스충전포장의 갈변억제 효과를 인식할 수 있었다. 25:20과 50:20의 포장에서는 고탄산가스 장해현상이 발생하여 저장 4일경부터 급격한 경도저하 현상이 나타났으며, 대조구에서는 저장 2일부터 절단면에서의 발생한 갈변현상으로 저장 4일경 상품한계치에 도달한 반면 10:5의 포장에서는 저장 20일경 부분적인 조직연화현상과 갈변으로 저장수명한계치에 도달하여, 대조구보다 결구상추의 신선도 연장효과가 높은 것으로 나타났다. This study was undertaken to evaluate the effect of gas flushing packaging (CO₂:O₂=10:5, 25:20 and 50:20) on the quality of fresh-cut iceberg lettuce (Lactuca sativa) by analyzing gas composition, phenylalanine ammonia-lyase, polyphenol oxidase, browning index, firmness and sensory evaluation during storage at 5℃ with control (CO₂:O₂=0:21) packaged with OPP (oriented polypropylene) film. Concentration of carbon dioxide in control was increased by 4.5% than initial day after 10 days of storage, however that of gas flushing packaging (10:5) was slightly increased to 11.3%. PAL, PPO activity and browning index of gas flushing packaging were lower than control and had an effect on preventing browning of iceberg lettuce. Packaging (25:20 and 50:20) showed lower firmness for injures by high concentration of carbon dioxide on 4 days of storage. Control showed the browning of cutting parts from 2 days and reached marketable limit on 4 days. Gas flushing packaging (10:5) reached marketable limit for browning of cutting part and softening of texture on 20 days but led to extend the shelf-life of fresh-cut iceberg lettuce longer than the control.