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기계적 합금화 투입에너지 계산에 의한 이원합금계의 상변태 시간 예측
박동규,안인섭,Park, Dong-Kyu,Ahn, In-Shup 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.2
The activation energy to create a phase transformation or for the reaction to move to the next stage in the milling process can be calculated from the slop of the DSC plot, obtained at the various heating rates for mechanically activated Al-Ni alloy systems by using Kissinger's equation. The mechanically activated material has been called "the driven material" as it creates new phases or intermetallic compounds of AlNi in Al-Ni alloy systems. The reaction time for phase transformation by milling can be calculated using the activation energy obtained from the above mentioned method and from the real required energy. The real required energy (activation energy) could be calculated by subtracting the loss energy from the total input energy (calculated input energy from electric motor). The loss energy and real required energy divided by the reaction time are considered the "metabolic energy" and "the effective input energy", respectively. The milling time for phase transformation at other Al-Co alloy systems from the calculated data of Al-Ni systems can be predicted accordingly.
박동규,김용진,Park Dong-Kyu,Kim Yong-Jin 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.1
분말야금제품의 $90\%$를 점하는 소결기계부품의 기술동향에 대해서 주요한 재료기술과 제조기술에 초점을 두고, 고강도 혹은 고정도라고 하는 시장의 요구에 대응한 신소결재료의 개발 및 고밀도 혹은 복잡형상에 대응하는 온간성형이나 확산접합등에 관한 제조기술에 대해서 개설했다.
박동규(Dong-Kyu Park),진강환(Kang-Hwan Jin),권순환(Soon-Hwan Kwon),이위(Wei Li),김윤호(Yoon-Ho Kim) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
In this paper, a speed control system is designed for the generation domestic high speed railway system with IPMSM drives. And their speed response and output characteristics are analyzed according to Inverter PWM method. Simulation programs based on MATLAB/Simulink are developed. Finally the designed system is verified by simulation
위 간질종양의 기원 및 분화에 관한 연구 - 면역조직화학적 방법을 중심으로 -
박동규(Dong Kyu Park),전훈재(Hoon Jai Chun),천황래(Hwang Rae Chun),박재홍(Jae Hong Park),오용열(Yong Leul Oh),박철희(Chul Hee Park),진윤태(Yoon Tae Jin),이홍식(Hong Sik Lee),이상우(Sang Woo Lee),엄순호(Soon Ho Um),최재현(Jai Hyun Cho 대한내과학회 2002 대한내과학회지 Vol.63 No.1
N/A Background: Gastrointestinal stromal tumors (GISTs) have the subject of debate and controversy regarding their histogenesis, criteria on malignancy, prognostic features, site-specificity and their nomenclature. These tumors have various phenotypical features and are generally divided into (1) tumors showing differentiation toward smooth muscle cells (2) tumors showing apparent differentiation toward neural elements (3) tumors showing dual differentiation toward smooth muscle and neural elements (4) tumors lacking differentiation toward either cell type (uncommitted type). This study was performed to identify the possible origin and differentiation of gastric stromal tumor. Methods: This study was performed on 38 patients who had gastric stromal tumors on endoscopy or endoscopic ultrasonography and confirmed by endoscopic or surgical resection between January 1994 and June 1999 at Department of Internal Medicine, Korea University College of Medicine. Formalin-fixed, paraffin-embedded tissues were studied by immunohistochemical method for detecting the presence of CD 34, CD 117, Vimentin, SMA, Desmin, S-100, PGP 9.5 and NSE. Results: The patients' age ranged from 26 to 81 years old, with an average age of 53.8 years. The male to female ratio was 1:1.2. Endoscopic resections were performed on 22 patients and surgical operations on 16 patients. The average tumor size was 25.3 mm in diameter. On immunohistochemical staining method, the uncommitted type was found in 18 patients (47.4%), of which 17 patients (94.4%) were CD117 (+), CD34 (+), Vimentin (+), 12 patients (31.6%) had muscular differentiation, 7 patients (18.4%) showed neural differentiation and 1 patient (2.6%) showed differentiation toward both neural and muscular immunohistochemical pattern. Conclusion: Gastric stromal tumors showed phenotypical diversity in immunohistochemical staining suggesting different histogenesis. Most uncommitted type had a phenotype of intersititial cells of Cajal (ICC) and this evidence supports the hypothesis that uncommitted type has the origin of ICC.(Korean J Med 63:14-22, 2002)
ROS 기반의 실내자율 주행 로봇의 자기위치 인식 및 딥러닝에 의한 제어 시스템
박동규(Dong Gyu Park),김규리(Kyu Ree Kim),장진우(Jin Woo Jang),김동환(Dong Hwan Kim) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.12
본 연구는 물류 센터 무인화를 위해 상자를 지역, 회사에 따라 분류하고 장애물을 실시간으로 회피하며 목표지점까지 운송하는 로봇 시스템을 개발하는 것을 목표로 하고 있다. 전체 제어 시스템은 ROS(robot operating system)로 구성하였으며, 모터 제어 및 기타 센서 처리를 위해 하부제어기로 OpenCR을 추가하였다. 또한 IMU 센서와 encoder를 결합한 odometry를 기반으로 AMCL(adaptive Monte Carlo localization) 알고리즘을 사용하여 로봇 위치를 추정 및 보정하였다. 또한 이를 LiDAR와 결합하여 맵핑 및 주행(navigation)을 진행하였다. 상자 분류는 YOLO를 통해 진행하였다. 그 결과 상자 분류를 통해 스스로 목표지점을 설정하고 라이더로 장애물을 인식하여 실시간으로 회피하는 자율주행 로봇을 구현하였다. In this study, an indoor self-driving automated guided vehicle that recognizes objects in a logistics center and transports them to their destinations is introduced. The robot must be aware of its location while it moves and must be able to recognize its surroundings in real time to operate in the self-driving mode. The control system is composed of a robot operating system (ROS) with OpenCR used as a lower controller for motor control and other sensor processing. The robot position is estimated by combining the adaptive Monte Carlo localization algorithm (AMCL) with odometry using an inertial measurement unit sensor and an encoder, and mapping and navigation are performed by combining it with LiDAR. In addition, box classification is conducted through you-only-look-once (YOLO) object detection. Consequently, we implement a self-driving robot that sets its own target point through box classification and avoids obstacles in real time by recognizing obstacles with LiDAR.