• Title/Summary/Keyword: Ui-Jeon

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Rotor Time Constant Compensation for Vector-Controlled Induction Motor with DC Current Injection Method (직류전류 주입법에 의한 벡터제어 유도전동기의 회전자 시정수 보상)

  • Lee, Gyeong-Ju;Lee, Deuk-Gi;Jeong, Jong-Jin;Choe, Jong-U;Kim, Heung-Geun;No, Ui-Cheol;Jeon, Tae-Won
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.2
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    • pp.69-76
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    • 2002
  • To obtain a high performance in a vector controlled induction motor, it is essential to know the instantaneous position of the rotor flux which depends on the rotor time constant. But the rotor time constant mainly varies due to the temperature rise in the motor winding, so real time compensating algorithm is necessary. This paper proposes that it uses short duration pulses added to the constant flux command current and then resultant torque command current produced by speed controller is utilized for the rotor resistance estimation. This method has advantage with a low computational requirement and does not require voltage sensors. The proposed method is proved by simulations and experimentals.

System Realization of Whale Sound Reconstruction (고래 사운드 재생 시스템 구현)

  • Chong, Ui-Pil;Jeon, Seo-Yun;Hong, Jeong-Pil
    • Journal of the Institute of Convergence Signal Processing
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    • v.20 no.3
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    • pp.145-150
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    • 2019
  • We develop the system realization of whale sound reconstruction by inverse MFCC algorithm with the weighted L2-norm minimization techniques. The output products from this research will contribute to the whale tourism and multimedia content industry by combining whale sound contents with the prototype of 3D printing. First of all, we develop the softwares for generating whale sounds and install them into Raspberry Pi hardware and fasten them inside a 3D printed whale. The languages used in the development of this system are the C++ for whale-sounding classification, MATLAB and Python for whale-sounding playback algorithm, and Rhino 6 for 3D printing.

The Study of the Seamless Handoff Algorithm in PDSNs (PDSN간 Seamless 핸드오프 알고리즘에 관한 연구)

  • Sin, Dong-Jin;Kim, Su-Chang;Im, Seon-Bae;Jeon, Byeong-Jun;Song, Byeong-Gwon;Jeong, Tae-Ui
    • The KIPS Transactions:PartC
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    • v.9C no.2
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    • pp.257-266
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    • 2002
  • In 3GPP2 wireless data communications, Mobile IP is used to support macro mobility and PDSN performs the function of foreign agent. The mobility supported when a mobile station moves from one PDSN to another is called a macro mobility. In this Paper, we first examine the possibilities of packet loss and change of packet sequences that can be occurred in macro mobility. Then, to resolve such Problems, we suggest a seamless handoff algorithm in PDSNs based on packet sequence control for each of down-stream and up-stream cases respectively.

Comparison of Spermatozoa Recovery Methods on Cauda Epididymal Sperm of Hanwoo Bulls

  • Kang, Sung-Sik;Kim, Ui-Hyung;Jeon, Min-Hyeong;Lee, Myung-Suk;Cho, Sang-Rae
    • Journal of Embryo Transfer
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    • v.33 no.4
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    • pp.321-326
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    • 2018
  • In this study, two epididymal spermatozoa recovery methods in relation to sperm number, motility, viability and acrosome reaction were examined. Seven bulls were castrated and 7 testicles with epididymides were transferred to the laboratoy. Epididymis in each bull was randomly used for flushing and mincing methods with semen extender (Optixcell, IMV, France). The recovered spermatozoa with adjusted sperm concentration to $40{\times}10^6cells/mL$ was diluted with optixcell and cryopreserved. In experiment 1, the difference in the total number of spermatozoa using flushing and mincing methods was insignificant (2570.0 and $2505.2{\times}10^6cells/mL$, respectively). For experiment 2, the percentage of motile spermatozoa and motility parameters between flushing and mincing methods were studied through the use of sperm class analyzer after frozen-thawing. The percentage of total motile sperm between flushing and mincing methods was almost the same with $89.5{\pm}12.8$ and $91.4{\pm}7.9%$, respectively. The same is the case with experiment 3 wherein the viability and acrosomal integrity of frozen-thawed epididymal spermatozoa by flushing and mincing was insignificantly different. The results from the study showed that both flushing and mincing methods can be used for epididymal spermatozoa recovery in bull.

2018 Russia World Cup UHD VOD Service Using HDR Video (HDR 기술을 활용한 2018 러시아 월드컵 UHD방송 VOD 서비스)

  • Ha, JongJin;Lee, DonIl;Ku, Jahoon;Um, YoungSik;Park, Seok-Gi;Song, JaeHo;Jang, JinHee;Jeon, SeongGyu
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2018.11a
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    • pp.49-52
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    • 2018
  • KBS를 비롯한 지상파방송 3사는 실시간 UHD방송과 VOD 온라인 동영상 서비스가 결합된 세계 최초의 지상파 양방향 UHD 플랫폼인 Tiviva(이하 티비바) 서비스를 2017년 11월 오픈하였다. 티비바는 별도의 셋톱박스 없이 UHD TV에 직접수신 안테나와 인터넷을 연결하여 지상파 방송사의 실시간 방송 채널 외에 다양한 UHD VOD와 클립을 이용할 수 있고, 스포츠와 드라마, 종편(JTBC, MBN), 영화 등 50여 개의 IP채널을 추가로 볼 수 있는 서비스이다. 이후 2018년 1월에는 이용자 편리성과 자동추천 기능 등 UI/UX를 크게 개선한 티비바 2.0을 업데이트 하였고, 평창올림픽 기간에는 전 경기 실시간 스트리밍 및 올림픽특별관을 운영하였다. 2018년 6월 러시아 월드컵 기간에는 축구 경기 UHD HDR 방송 중계와 함께 티비바를 통한 HDR VOD를 최초로 서비스하여 스포츠 경기를 즐기는 또다른 즐거움을 선사하였다. 본 논문에서는 러시아 월드컵 HDR VOD 서비스를 준비하고 시행하기 위한 시스템 설계 및 진행과정, 기술 이슈 등에 대해서 기술하려고 한다.

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Relationship Between Lower Extremity Extensor Strength and Wall Squat Performance

  • Jung, Sung-hoon;Hwang, Ui-jae;Kim, Jun-hee;Jeon, In-cheol;Kwon, Oh-yun
    • Physical Therapy Korea
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    • v.26 no.4
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    • pp.20-28
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    • 2019
  • Background: The wall squat exercise has been recommended for strengthening of the lower extremity muscles with maintaining lumbar lordosis. Although squat has been studied to be related to lower extremity extensor strength, the relationship between wall squat and lower extremity extensor strength unclear. Because squat and wall squat are biomechanically different, study on the relationship is needed. Objects: The purpose of this study was to determine the lower extremity extensor strength associated with wall squat performance. Methods: 74 healthy volunteers were recruited to participate in this study. The volunteers were measured hip and knee extensors strength and then performed wall squat exercise for maximum count. Results: We found significant relationships between wall squat performance and hip extensor strength normalized by body weight, knee extensor strength normalized by body weight and the composite value. In a regression analysis, hip extensor strength normalized by body weight explained 29% of the variation in wall squat performance in males and 35% in females. Conclusion: These results demonstrate that hip extensor strength normalized by body weight is critical to wall squat performance in both sexes.

Stability Review on Buoyancy Moment in the Water Treament Concrete Structure (수처리 콘크리트 구조물의 부력모멘트에 대한 안정성 검토)

  • Shim, Ui Jeon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.41 no.3
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    • pp.327-330
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    • 2021
  • Though the stability review of buoyancy is generally done, the stability review of buoyancy moment, which is generated from the eccentricity between the center of fixed load and that of buoyancy, is not done in the water treatment concrete structure and the architectual structure. In this review, as the buoyancy force become larger, the action point of the fixed load (ΣW) and buoyancy (B), and the reaction distribution were considered to confirm the formation of the buoyancy moment rotational point and obtained the rotational uplift stability review formula for buoyancy moment in the water treatment concrete structure and the architechual structure, and put forward the stability review method for buoyancy moment.

An Implementation of Feeding Time Detection System for Smart Fish Farm Using Deep Neural Network (심층신경망을 이용한 스마트 양식장용 사료 공급 시점 감지 시스템 구현)

  • Joo-Hyeon Jeon;Yoon-Ho Lee;Moon G. Joo
    • IEMEK Journal of Embedded Systems and Applications
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    • v.18 no.1
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    • pp.19-24
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    • 2023
  • In traditional fish farming way, the workers have to observe all of the pools every time and every day to feed at the right timing. This method causes tremendous stress on workers and wastes time. To solve this problem, we implemented an automatic detection system for feeding time using deep neural network. The detection system consists of two steps: classification of the presence or absence of feed and checking DO (Dissolved Oxygen) of the pool. For the classification, the pretrained ResNet18 model and transfer learning with custom dataset are used. DO is obtained from the DO sensor in the pool through HTTP in real time. For better accuracy, the next step, checking DO proceeds when the result of the classification is absence of feed several times in a row. DO is checked if it is higher than a DO reference value that is set by the workers. These actions are performed automatically in the UI programs developed with LabVIEW.

Preliminary Hazard Analysis of Vehicle with G-SAVE Technology (G-SAVE 공법 탑재 차량의 예비위험성평가)

  • Ui Pil Chong;Hyun Chul Park;Young Soo Park;Byung Chul Ahn;Deok Soo Han;Hyeon Jun Jeon
    • Journal of the Korean institute of surface engineering
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    • v.56 no.4
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    • pp.283-287
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    • 2023
  • The structures for road safety are guard rails that protect the cars and passengers. If an accident occurs on the roads after a long period of installation, it may escalate into a major disaster. In order to repair many guard rails, the existing repair method of replacing them with new ones requires enormous financial resources. To solve this problem, the G-SAVE method was developed to repair the guard rail without replacing them. This method removes the rust on the surface of the guard rail and then performs ambient-dip galvanizing coating on it without replacing the new ones. No studies or reports have yet been made on the risk assessment of harmful substances, vehicles for these entire processes. Therefore, this paper focuses on risk assessment using the PHA (Preliminary Hazard Analysis) technique and conducts risk assessment for concept design stage of the coating vehicles.

Data Framework Design of EDISON 2.0 Digital Platform for Convergence Research

  • Sunggeun Han;Jaegwang Lee;Inho Jeon;Jeongcheol Lee;Hoon Choi
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.17 no.8
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    • pp.2292-2313
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    • 2023
  • With improving computing performance, various digital platforms are being developed to enable easily utilization of high-performance computing environments. EDISON 1.0 is an online simulation platform widely used in computational science and engineering education. As the research paradigm changes, the demand for developing the EDISON 1.0 platform centered on simulation into the EDISON 2.0 platform centered on data and artificial intelligence is growing. Herein, a data framework, a core module for data-centric research on EDISON 2.0 digital platform, is proposed. The proposed data framework provides the following three functions. First, it provides a data repository suitable for the data lifecycle to increase research reproducibility. Second, it provides a new data model that can integrate, manage, search, and utilize heterogeneous data to support a data-driven interdisciplinary convergence research environment. Finally, it provides an exploratory data analysis (EDA) service and data enrichment using an AI model, both developed to strengthen data reliability and maximize the efficiency and effectiveness of research endeavors. Using the EDISON 2.0 data framework, researchers can conduct interdisciplinary convergence research using heterogeneous data and easily perform data pre-processing through the web-based UI. Further, it presents the opportunity to leverage the derived data obtained through AI technology to gain insights and create new research topics.