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Adaptive Electrospinning System Based on Reinforcement Learning for Uniform‑Thickness Nanofiber Air Filters

Advanced Fiber Materials 2023年第2期5卷 617-631页

作者： Seok Hyeon Hwang Jin Yeong Song Hyun Il Ryu Jae Hee Oh Seungwook lee donggeun lee Dong Yong Park Sang Min Park School of Mechanical Engineering Pusan National University63‑2 Busan University‑roGeumjeong‑guBusan 46241South Korea Smart Manufacturing Technology R&D Group Korea Institute of Industrial Technology320 Techno Sunhwan‑roYuga‑eupDalseong‑gunDaegu 42994Republic of Korea

Electrospinning is a simple and versatile method to produce nanofiber ***,owing to bending instability that occurs during the electrospinning process,electrospinning has frequently produced a non-uniform-thickness nanofiber filter,which deteriorates its air ***,an adaptive electrospinning system based on reinforcement learning(E-RL)was developed to produce uniform-thickness nanofiber *** E-RL accomplished a real-time thickness measurement of an electrospun nanofiber filter by measuring the transmitted light through the nanofiber filter using a camera placed at the bottom of the collector and converting it into thickness using the Beer–Lambert *** on the measured thickness,the E-RL detected the non-uniformity of the nanofiber filter thickness and manipulated the movable collector to alleviate the non-uniformity of the thickness by a pre-trained reinforcement learning(RL)*** the training of the RL algo-rithm,the nanofiber production simulation software based on the empirical model of the deposition of the nanofiber filter was developed,and the training process of the RL algorithm was repeated until the optimal policy was *** the training process with the simulation software,the trained model was transferred to the adaptive electrospinning *** the movement of the collector under the optimal strategy of RL algorithm,the non-uniformity of such nanofiber filters was significantly reduced by approximately five times in standard deviation and error for both simulation and *** finding has great potential in improving the reliability of electrospinning process and nanofiber filters used in research and industrial fields such as environment,energy,and biomedicine.

关键词： Electrospinning Nanofiber filter Uniform thickness Reinforcement learning Deep Q-network

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Temporal and spatial differentiation in microhabitat use: Implications for reproductive isolation and ecological niche specification

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Integrative Zoology 2016年第5期11卷 375-387页

作者： Amaël BORZÉE Jun Young KIM Marina Andrade Martins DA CUNHA donggeun lee Eunchong SIN Sunmin OH Yoonjung YI Yikweon JANG Department of Life Sciences and Division of EcoScience Ewha Womans UniversitySeoulKorea Interdisciplinary Program of EcoCreative Ewha Womans UniversitySeoulKorea School of Biological Sciences Seoul National UniversityKorea

Niche differentiation enables ecologically similar species to coexist by lessening competition over food and/or shelters and may be critical for reproductive isolation between closely related species in close ***cause no extra traits need to evolve,spatial and temporal differentiation may readily take place to complement other isolating *** closely related treefrog species occur together in Korea:the endangered Hyla suweonensis and the widespread Hyla *** calls are differentiated,but it is unclear whether call difference is sufficient for reproductive *** tracked individuals of both species to study fine-scale differentiation in microhabitat use in the diel cycle of the breeding season using a harmonic direction *** male movement patterns of both species revealed spatial and temporal differentiation in microhabitat use for calling and resting during the breeding *** of both *** and *** occurred in all 5 microhabitats identified in this study:rice paddy,ground,buried,grass and *** treefrog species showed general similarities in calling from rice paddies and resting in grass and ***,*** moved into rice paddies and produced advertisement calls 3 h earlier than *** differences likely minimize contact between the species and provide an additional isolating *** addition,the activity of *** may be contributing to the decline of this species,as resting in grass would increase dangers from predatory birds and habitat disturbance.

关键词： harmonic direction finding hylid treefrog pre-mating isolation mechanisms spatial isolation temporal isolation

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Correction to:Adaptive Electrospinning System Based on Reinforcement Learning for Uniform‑Thickness Nanofiber Air Filters

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Advanced Fiber Materials 2023年第2期5卷 695-695页

Correction to:Advanced Fiber Materials https://***/10.1007/s42765-022-00247-3 In this article the author name Dong Yong Park was incorrectly written as Dong Young *** original article has been ***'s Note Springer Natu... 详细信息

关键词： Uniform neutral corrected

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Prevention and management of non-steroidal anti-inflammatory drugs-induced small intestinal injury

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World Journal of Gastroenterology 2011年第42期17卷 4647-4653页

作者： Sung Chul Park Hoon Jai Chun Chang Don Kang donggeun Sul Division of Gastroenterology and Hepatology Department of Internal MedicineKangwon National University School of Medicine Division of Gastroenterology and Hepatology Department of Internal MedicineKorea University Anam Hospital Korea University College of Medicine Graduate School of Medicine Korea University

Non-steroidal anti-inflammatory drug （NSAID）-induced small bowel injury is a topic that deserves attention since the advent of capsule endoscopy and balloon enteroscopy. NSAID enteropathy is common and is mostly asymptomatic. However, massive bleeding, stricture, or perforation may occur. The pathogenesis of small intestine injury by NSAIDs is complex and different from that of the upper gastrointestinal tract. No drug has yet been developed that can completely prevent or treat NSAID enteropathy. Therefore, a long-term randomized study in chronic NSAID users is needed.

关键词： Non-steroidal anti-inflammatory drugs Small intestinal injury Prevention Treatment

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Performance evaluation and calibration of capacitance sensor for estimating the salinity of reclaimed land

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International Journal of Agricultural and Biological Engineering 2020年第1期13卷 206-210页

作者： donggeun Kim Younghwan Son Jaesung Park Taejin Kim Jihun Jeon Department of Rural Systems Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Rural Systems Engineering and Research Institute for Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Department of Bioresource Engineering McGill UniversitySte-Anne-de-Bellevue QC H9X 3V9Canada

Generally,soil moisture and salinity in reclaimed land are monitored using soil dielectric sensors such as time domain reflectometry,frequency domain reflectometry,and *** soil dielectric sensor measures apparent dielectric ***,apparent dielectric permittivity is affected by soil moisture,salinity,and *** this study,performance evaluation and calibration of a dielectric sensor(5TE;METER Group,Inc.,Pullman,WA,USA)for monitoring soil salinity were *** calibration tests were completed,incorporating various levels of dry density,water content,and *** soil salinity was determined by the electrical conductivity(EC)1:5 *** volumetric water content as measured by the sensor was affected by dry density and water ***,it linearly increased as dry density and water content ***,when dry density or water content was high,the measured value of the sensor increased *** bulk EC measured by sensor had no specific correlation with EC 1:*** EC 1:5 measurement had a linear relationship with the gradient ofθandθ***,it can be estimated with a simple linear equation usingθfrom the soil test andθs from the capacitance *** R 2 value of the EC 1:5 estimation equation was *** proposed equation requiresθfrom the gravimetric sample andθs from the ***,in the case of monitoring salinity using a sensor,it is recommended to measure the water content with a tensiometer.

关键词： salinity capacitance sensor volumetric water content reclaimed land soil saline soil

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3D obstacle detection of indoor mobile robots by floor detection and rejection

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Journal of Measurement Science and Instrumentation 2013年第4期4卷 381-384页

作者： donggeun Cha Woojin Chung School of Mechanical Engineering Korea University

Obstacle detection is essential for mobile robots to avoid collision with *** robots usually operate in indoor environments,where they encounter various kinds of obstacles;however,2D range sensor can sense obstacles only in 2D *** contrast,by using 3D range sensor,it is possible to detect ground and aerial obstacles that 2D range sensor cannot *** this paper,we present a 3D obstacle detection method that will help overcome the limitations of 2D range sensor with regard to obstacle *** indoor environment typically consists of a flat *** position of the floor can be determined by estimating the plane using the least squares *** determined the position of the floor,the points of obstacles can be known by rejecting the points of the *** the experimental section,we show the results of this approach using a Kinect sensor.

关键词： 3D obstacle detection mobile robot Kinect sensorDocument code:AArticle ID:1674-8042(2013)04-0381-04

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标准化终身教育的内容模块

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标准生活 2010年第6期 14-15页

作者： donggeun Choi 韩国标准化协会

如何在基础教育到职业教育的各阶段发展实施分级结构的标准化教育项目,并在功能上将各阶段各级别统一起来,是我们需要考虑的问题。

关键词：终身教育标准化模块分级结构职业教育基础教育

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