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Haichuan Xu,Housheng Su,Qiming Wang,Chengjie Xu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.9
This paper investigates semi-global adaptive bipartite output consensus of continuous-time multi-agent systems (MASs) with input saturation and non-identical external disturbance under jointly connected switching network. An adaptive bipartite output consensus protocol of MASs is proposed by using low-gain feedback technology. It is turned out that semi-global adaptive bipartite consensus of MASs can be achieved under the protocol. Furthermore, the proposed control protocol can be applied for MASs under fixed network, and semi-global adaptive bipartite output consensus can be also achieved in this case. Finally, the simulations will verify the effectiveness of theoretical results.
Haichuan Shi,조종래,Dong-Gyu An 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.3
The Stellite 21 superalloy has excellent creep resistance and mechanical strength at elevated temperatures, is resistant to wear and thermal fatigue, and has good weldability. Therefore, it is frequently used as a surface-hardened metal for hot forging dies. In this study, the Stellite 21 superalloy was deposited on an SKD61 matrix material using direct metal deposition technology. The temperature field of the deposition region during hot forging was predicted using the finite-element method. The mcrostructure and hardness of the Stellite 21 before and after service were evaluated. Various methods were employed for these evaluations, such as microhardness tests, optical microscopy, scanning electron microscopy, energydispersive X-ray spectroscopy, and X-ray diffraction (XRD) analysis. The phase transformation of the Stellite 21 from γ-Co to ε-Co before and after service was investigated using XRD. The results indicated that the hardness of the Stellite 21 after service was increased owing to precipitation strengthening by carbides and an increase in ε-Co.
Haichuan Chen,Gaoyang Shan,Byeong-hee Roh 한국차세대컴퓨팅학회 2023 한국차세대컴퓨팅학회 학술대회 Vol.2023 No.06
Computer vision has rapidly evolved into a critical field that has garnered significant attention due to its applications in face recognition, human body analysis, automatic driving, indoor positioning, and other domains. The accuracy and speed of object detection have become a primary focus in computer vision research. Among the notable architectures, YOLO stands out, as it delivers remarkable speed that is 300 times faster than Fast-RCNN while maintaining comparable accuracy. In this paper, we proposed the topic of spatial recognition using the YOLO architecture. Specifically, we propose a solution that utilizes indoor video footage to identify objects in space, extract their spatial information, and store them in a database for matching and identifying spaces. We also introduce a new fingerprint input method that leverages monocular vision and YOLO algorithm to assist users in determining their location and space. Our study provides valuable insights and directions for future spatial recognition research.
Haichuan Shi,조종래,윤주환,이호진,안동규 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.12
The hardfacing process can effectively overcome surface softening of dies and improve the service life in hot forging operations; however, thermal cracks are frequently generated on deposited areas due to thermal stress from different material properties. A thermal stress control layer (TSCL) is applied to reduce thermal stress and increase fatigue life as a buffer in the vicinity of the joining region between the hardfacing layer and the base metal. The TSCL and hardfacing layer are deposited through layer-by-layer deposition on the surfacing of the substrate using a 3D printing process. The TSCL, which is produced by mixing of Stellite 21 and SKD61, is designed with thicknesses of 0 mm, 1 mm, 1.5 mm, and 2 mm respectively. The study aims to estimate the effect of a TSCL focused on thermal stress in the deposition region via two-dimensional finite element analysis. In addition, the optimal volume of transition regions and composition proportions are also predicted for the hot forging die of an axle shaft.
Shi, Haichuan,Yu, Zhishui,Cho, JongRae Elsevier 2018 Vacuum Vol.151 No.-
<P>Vacuum brazing of Cr18-Ni8 steel was performed using the BNi7+9%Cu mixed filler metal at the different brazing temperature. Microstructure, microhardness and shear strength were investigated by means of scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), hardness tester and AG-25TA electronic universal material testing machine. The results indicated that the brazed region was divided into isothermal solidification zone (ISZ) and athermal solidification zone (ASZ). The gamma-Ni (Cr, Fe, Cu) solid solution was formed in the ISZ, and its thickness would increase as brazing temperature increased. On the other hand, the generated microstructure was different by the change of chemical composition in the ASZ and its microhardness would increase as the brazing temperature increased. Elemental distribution indicated that Ni and Cu gradually gathered on both sides of the brazed joints as brazing temperature increased, while P and Cr were concentrated in the middle. In addition, the bonding behaviors of brazed joint was also illustrated based on the elemental distribution and microstructure distribution of brazed joint. Finally, an excellent brazing joint of Cr18-Ni8 steel was obtained at 980 degrees C for 30 min s and its shear strength was as high as 144 MPa. (C) 2018 Elsevier Ltd. All rights reserved.</P>
Chen, Haichuan Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.2
The mechanical properties of α-Na<sub>3</sub>(U<sub>0.84(2)</sub>,Na<sub>0.16(2)</sub>)O<sub>4</sub> have been researched using the first-principles calculations combined with the quasi-harmonic Debye model. The obtained lattice parameters agree well with the published experimental data. The results of elastic constants indicate that α-Na<sub>3</sub>(U<sub>0.84(2)</sub>,Na<sub>0.16(2)</sub>)O<sub>4</sub> is mechanically stable. The polycrystalline moduli are predicted. The results show that the α-Na<sub>3</sub>(U<sub>0.84(2)</sub>,Na<sub>0.16(2)</sub>)O<sub>4</sub> exhibits brittleness and possesses obvious elastic anisotropy. The hardness shows that it can be considered a "soft material". Furthermore, the Debye temperature θ<sub>D</sub> and the minimum thermal conductivity k<sub>min</sub> are also discussed, respectively. Finally, the thermal expansion coefficient α, isobaric heat capacity C<sub>P</sub> and isochoric heat capacity C<sub>V</sub> are evaluated through the quasi-harmonic Debye model.
임정현,CHEN HAICHUAN,노병희 한국차세대컴퓨팅학회 2023 한국차세대컴퓨팅학회 학술대회 Vol.2023 No.06
실내 측위 시스템은 다양한 기술을 활용하여 연구되고 있다. 하지만 활용되는 기술에 따라 측정되는 위치정보의 오차가 매우 크거나 전력 소모 등의 문제로 서비스 제공이 원활히 이루어지지 못하고 있다. 본 논문에서는 실내 측위에 활용 가능한 저전력 기술인 Bluetooth Low Energy beacon을 활용한 기존의 실내 측위 시스템에서 오차를 줄이기 위해 XGBoost 라이브러리의 XGBRegressor 모델을 사용한 기계학습 활용을 제안하고, 이를 구현하여 성능 분석한 결과를 제시한다.
Case Studies on Augmented Reality (AR)-Enabled Indoor Localization Technologies and Services
Dae-ha Yoo,Haichuan Chen,Gaoyang Shan,Byeong-hee Roh 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.10
The individual markets for indoor localization service (ILS) and augmented reality (AR) are expected to grow significantly. These combined services will be very diverse, and the market is expected to grow significantly. This paper presents representative technologies supporting ILS based on wireless communications and computer visions. Then, AR-enabled ILS cases are also presented.
張進凱(Zhang Jinkai),趙海川(Zhao Haichuan) 중국어문학연구회 2021 중국어문학논집 Vol.- No.127
This research adopts the logistic regression model fitted on richly annotated corpus data to investigate the constraining factors of “X BUBI Y · Z”“X MEIYOU Y · Z”and their effect sizes. Conditional inference tree and random forest models are also utilized to analyze the multiple interaction effects between constraints and their relative importance. The results show that the factors such as the positive and negative meanings of the conclusion, the semantic class of the compared item, the position of the comparison point, the type of the conclusion, the word length, register and the semantic class of the compared item significantly influence the constructional choice of “X BUBI Y · Z”and “X MEIYOU Y · Z”.