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Kim, Minju,Cho, Min Sang,Cho, Byoung Ick Elsevier 2017 JOURNAL OF NUCLEAR MATERIALS Vol.487 No.-
<P><B>Abstract</B></P> <P>Laser induced breakdown spectroscopy (LIBS) has been tested to diagnose impurity elements on a Korea Superconducting Tokamak Advanced Research (KSTAR) divertor tile. Spectral lines of various impurity elements such as iron, chromium, and nickel were detected from the divertor surface. The variation of spectra with consecutive laser pulses demonstrates the potential for depth profiling analysis for the deposited impurity layer. The LIBS plasma parameters have been qualitatively determined from analysis of the relative line intensities and linewidths for each element. The validity of this analysis has been checked with atomic spectral simulations.</P>
乾隆時期 宮廷畵家 徐揚의 長券山水畵에서 보이는 지리학적 서사 형성 연구
조민주(Minju Cho) 한국고지도연구학회 2023 한국고지도연구 Vol.15 No.1
이 글은 건륭 시기 제작된 쉬양의 「乾隆南巡圖」 제4권과 청대 水利圖와의 비교 분석을 통하여 쉬양이 시각화하려 했던 지리학의 내용을 파악하고 쉬양 작품에서의 지리학적 서사 형성 과정을 고찰한 논문이다. 「건륭남순도」 제4권에서는 건륭제가 江蘇省 淮安府 靑口 지역을 방문하여 자신의 치수 사업을 기념하는 장면을 묘사하고 있다. 「건륭남순도」보다 앞서 제작된 「南巡紀道圖」는 건륭제의 1차 남순을 전후하여 강남지역의 최신의 지리정보를 보여주고 있다. 두 그림에서의 회안부 청구지역의 지리 묘사는 건륭 1차 남순을 전후로 제작된 南下圖說 , 乾隆南巡紀程圖 등의 지도에서 보이는 최신의 지리정보를 충실하게 반영하고 있다. 두 작품은 일반 지도의 평면식 투영(mapping)에서 보여주기 힘든 城市와 水路 사이의 유기적 관계를 입체적으로 생생하게 보여주고 있다. 미술과 지리학의 경계를 넘나드는 쉬양의 장권산수화에 대한 연구는 중국 전근대시기 시각 지식 형성의 통섭적인 면모를 구명하는데 중요한 의의가 있다. The fourth scroll of The Qianlong Southern Inspection Tour which was painted by a court painter, Xu Yang, is based on a poem written by Emperor Qianlong. The scroll shows the achievements of flood control of the Qingkou region in Huianbu that Emperor Qianlong visited during his first southern inspection tour in 1751. This picture not only faithfully conveys the political narrative of the emperor, but also objectively represents topological information about the region. The achievements of the Qianlong Emperor, such as the extension of the East and West Dams and Gaojia dyke, are shown in the painting, which can be compared with the government documentary, as well as the river maps produced before and after the emperors first tour. This painting is very important in understanding the relationship between realistic representation and topological narrative in Qing Dynasty court painting. It shows how visualizing both the geological and historical information about the Huianfu region and the emperor's water management achievements became a political metaphor. In this paper, I will explore the method of constructing a cartographic narrative in the court painting by comparing the pictorial description shown in the fourth scroll of The Qianlong Southern Inspection Tour with the remaining Qing court documentaries and river maps. I will also examine the realistic manner in Xu yang’s paintings, which uses Western painting techniques to transmit geographic information.
Cho Woong Jin,Ahn Jinsung,Lee Minju,Choi Hyejong,Park Sunghyun,Cha Kyung-Yup,Lee SunJun,Arai Yoshie,Lee Soo-Hong 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.1
BACKGROUND: Mesenchymal stem cells (MSCs) are used for tissue regeneration due to their wide differentiation capacity and anti-inflammatory effects. Extracellular vesicles (EVs) derived from MSCs are also known for their regenerative effects as they contain nucleic acids, proteins, lipids, and cytokines similar to those of parental cells. There are several studies on the use of MSCs or EVs for tissue regeneration. However, the combinatorial effect of human MSCs (hMSCs) and EVs is not clear. In this study, we investigated the combinatorial effect of hMSCs and EVs on cartilage regeneration via co-encapsulation in a hyaluronic-acid (HA)-based hydrogel. METHODS: A methacrylic-acid-based HA hydrogel was prepared to encapsulate hMSCs and EVs in hydrogels. Through in vitro and in vivo analyses, we investigated the chondrogenic potential of the HA hydrogel-encapsulated with hMSCs and EVs. RESULTS: Co-encapsulation of hMSCs with EVs in the HA hydrogel increased the chondrogenic differentiation of hMSCs and regeneration of damaged cartilage tissue compared with that of the HA hydrogel loaded with hMSCs only. CONCLUSION: Co-encapsulation of hMSCs and EVs in the HA hydrogel effectively enhances cartilage tissue regeneration due to the combinatorial therapeutic effect of hMSCs and EVs. Thus, in addition to cartilage tissue regeneration for the treatment of osteoarthritis, this approach would be a useful strategy to improve other types of tissue regeneration.
Modulated model predictive current control of HERIC AFE converter equipped with LCL filter
Minju Kang,Jinwoo Kim,Sanghun Han,Younghoon Cho,Eunsoo Lee 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.1
This paper proposes a modulated model predictive control (MMPC) of a highly efficient and reliable inverter concept (HERIC) active front end (AFE) converter equipped with an LCL filter. The proposed method is based on the model predictive control (MPC) concept and obtains the optimized duty cycle by using three-level switching states which can be implemented in the HERIC converter. By doing so, the AFE converter achieves fast and precise current control. In addition, the obtained duty cycle is not limited to the polarity of the grid voltage, so it is possible to track the current reference more accurately near the zero-crossing points. The first-order approximation model of the LCL filter is derived to simplify the controller design process with the proposed MMPC. After that, the MMPC algorithm is adopted based on this simplified model in the single-phase system. The switching pattern of the HERIC topology is also proposed considering the MMPC under changing polarity of the duty cycle. To verify the performance of the proposed scheme, a 3 kW HERIC AFE converter was built and tested. Both simulation and experimental results demonstrate that the proposed scheme not only improves total harmonic distortion, but also achieves a fast-tracking performance.
A deep learning-based approach for feeding behavior recognition of weanling pigs
( Minju Kim ),( Yohan Choi ),( Jeong-nam Lee ),( Soojin Sa ),( Hyun-chong Cho ) 한국축산학회 2021 한국축산학회지 Vol.63 No.6
Feeding is the most important behavior that represents the health and welfare of weanling pigs. The early detection of feed refusal is crucial for the control of disease in the initial stages and the detection of empty feeders for adding feed in a timely manner. This paper proposes a real-time technique for the detection and recognition of small pigs using a deep-leaning-based method. The proposed model focuses on detecting pigs on a feeder in a feeding position. Conventional methods detect pigs and then classify them into different behavior gestures. In contrast, in the proposed method, these two tasks are combined into a single process to detect only feeding behavior to increase the speed of detection. Considering the significant differences between pig behaviors at different sizes, adaptive adjustments are introduced into a you-only-look-once (YOLO) model, including an angle optimization strategy between the head and body for detecting a head in a feeder. According to experimental results, this method can detect the feeding behavior of pigs and screen non-feeding positions with 95.66%, 94.22%, and 96.56% average precision (AP) at an intersection over union (IoU) threshold of 0.5 for YOLOv3, YOLOv4, and an additional layer and with the proposed activation function, respectively. Drinking behavior was detected with 86.86%, 89.16%, and 86.41% AP at a 0.5 IoU threshold for YOLOv3, YOLOv4, and the proposed activation function, respectively. In terms of detection and classification, the results of our study demonstrate that the proposed method yields higher precision and recall compared to conventional methods.
Dynamic Compressive Properties Obtained from a Split Hopkinson Pressure Bar Test of Boryeong Shale
Minju Kang,Jung-Woo Cho,Yang Gon Kim,Jaeyeong Park,Myeong-Sik Jeong,Sunghak Lee 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.5
Dynamic compressive properties of a Boryeong shale were evaluated by using a split Hopkinson pressure bar, and were compared with those of a Hwangdeung granite which is a typical hard rock. The results indicated that the dynamic compressive loading reduced the resistance to fracture. The dynamic compressive strength was lower in the shale than in the granite, and was raised with increasing strain rate by microcracking effect as well as strain rate strengthening effect. Since the number of microcracked fragments increased with increasing strain rate in the shale having laminated weakness planes, the shale showed the better fragmentation performance than the granite at high strain rates. The effect of transversely isotropic plane on compressive strength decreased with increasing strain rate, which was desirable for increasing the fragmentation performance. Thus, the shale can be more reliably applied to industrial areas requiring good fragmentation performance as the striking speed of drilling or hydraulic fracturing machines increased. The present dynamic compressive test effectively evaluated the fragmentation performance as well as compressive strength and strain energy density by controlling the air pressure, and provided an important idea on which rock was more readily fragmented under dynamically processing conditions such as high-speed drilling and blasting.