스키 시뮬레이터 운동 시 하지 운동특성 분석 및 관성센서 파라미터를 이용한 스키 숙련도 평가

김정윤,안순재,박선우,신이수,김규석,김영호,Kim, Jungyoon,Ahn, Soonjae,Park, Sunwoo,Shin, Isu,Kim, Gyoosuk,Kim, Youngho 대한의용생체공학회 2014 의공학회지 Vol.35 No.3

In this study, joint angles of the lower extremity and inertial sensor data such as accelerations and angular velocities were measured during a ski simulator exercise in order to evaluate the skill of skiers. Twenty experts and twenty unskilled skiers were recruited for the study. All expert skiers held the certificates issued by the Korea Ski Instructors Association. A three-dimensional motion capture system and two inertial sensors were used to acquire joint movements, heel acceleration and heel angular velocity during ski simulator exercises. Pattern variation values were calculated to assess the variations in ski simulator motion of expert and unskilled skiers. Integral ratio of roll angular velocity was calculated to determine the parallel alignment of the two feet. Results showed that ski experts showed greater range of motion of joint angle, peak-to-peak amplitude(PPA) of heel acceleration and PPA of heel angular velocity than unskilled skiers. Ski experts showed smaller pattern variations than unskilled skiers. In addition, the integral ratio of roll angular velocity in ski experts was closer to 1. Inertial sensor data measurements during the ski simulator exercises could be useful to evaluate the skill of the skier.

서울 다이나믹스 - 청계천 시점부 광장 설계 -

김정윤,오피스 박김,Kim Jung-Yoon,ParkKim Office 한국조경학회 2006 韓國造景學會誌 Vol.34 No.1

The process of designing Cheonggyecheon Entrance Plaza began with researching four keywords: plaza, restoration. modernity and icon. The outcome of the research was reinterpreted into and informed the design. An urban plaza must not only be a stage for civic life but should also be a portrait of the city to which it belongs. Many Korean plazas, however, are treated as if they are parks. Yeouido Park, which was originally a vast urban void, and Seoul Plaza, recently paved with grass, are good example. The strong 'green myth' can hinder socio-political activities. Cheonggyecheon cannot be said to have been 'restored', since it is still disconnected from its origin and upper streams, and the water is circulated by electricity. So it is better understood as an artificial urban waterfront, rather than an ecologically restored stream. This fact might diminish its ecological value, but not its recreational one. The entrance plaza therefore should reflect that the new stream brings back an 'experience', not only water itself. At the same time, the catch phrase of this restoration project was 'post-modern'. The demolished Cheonggye Expressway represents the 'economy drive' of the 1970s, so the newly opened Cheonggyecheon serves as a perfect counterpart to it. But modernity in Korea is the spirit that made many of the good things, not only its shortcomings, we have now. And from the philosophy of this restoration project, we can see that it is still an ongoing attitude in a way. Remnant of Cheonggye Expressway can evoke our nostalgia for the era. There are plenty of symbols in Seoul, both as architecture and objects. But none of them provide citizens with experience, other than the experience of looking at them. Cheonggyecheon Entrance Plaza is a good place to serve as an icon for a dynamic Seoul. From the research, the designer concluded that this plaza should commemorate the incomparable horizontal experience of Cheonggyecheon and the old expressway, amid the vertical metropolis. The Pedestrian Sculpture, which people can stroll on and look out over Cheonggyecheon, is to be made of steel cladding with a core structure and represents the dynamism of the stream, Seoul and contemporary Korea. The choice of material and the steel structure are also ways of creating the icon. The Water Plaza, the space underneath the ramp, will accommodate people and their urban activities, providing an opportunity to play with water. The Waterblades will be a device for the dramatic beginning of the stream, simultaneously camouflaging ugly openings in the outlets. The Wall of Archaeology is to be made with pre-fab resin blocks, translucent enough so that people can see through any archaeological findings of the site. The strong water-resistant character of resin makes the wall steady throughout the flood season as well. Cheonggyecheon restoration project is an effort to combine contemporary urban demand with the once-existing physicality by evoking our nostalgia for it. The project itself shows many socio-political issues of present-day Korea. The entrance plaza design thus is focused on suggesting an icon for the metropolis, simultaneously celebrating the stream itself. Within this space, people will be exposed to a unique experience that any 'green myth' cannot offer.

광인터넷 기술

김정윤,최준균,이우섭,Kim, Jeong-Yun,Choe, Jun-Gyun,Lee, U-Seop 한국정보통신기술협회 2006 TTA저널 Vol.108 No.-

BICC 프로토콜의 표준화 동향

김정윤,박영식,남상식,박권철,Kim, J.Y.,Park, Y.S.,Nam, S.S.,Park, K.C. 한국전자통신연구원 2001 전자통신동향분석 Vol.16 No.2

BICC 프로토콜은 광대역 패킷 네트워크 위에서 기존 PSTN/ISDN 네트워크 인터페이스와 서비스에 어떠한 영향도 주지 않으면서 PSTN/ISDN 서비스를 제공하기 위한, ISUP 신호 프로토콜 기반의 호 제어 신호 프로토콜이다. 본 고에서는 BICC 네트워크의 구조 및 구성 요소, BICC 프로토콜의 동작 절차, 그리고 BICC 표준 문서의 구성과 체계를 소개한다. 또한 IP 베어러 연결을 설정하기 위하여 새로 정의한 IPBCP 프로토콜을 기술하고, 마지막으로 향후 BICC 프로토콜의 표준화 전망을 기술한다.

레드비트의 생리활성

김정윤,김현구,Kim, Jung-Yun,Kim, Hyun-Ku 한국식품연구원 2009 食品技術 Vol.22 No.3

국제회의 참가보고 - ITU-T SG13 회의

김정윤,최준균,Kim, Jeong-Yun,Choe, Jun-Gyun 한국정보통신기술협회 2010 TTA저널 Vol.128 No.-

B-ISDN 호제어 프로토콜

김정윤,박호진,김한경,Kim, Jeong-Yun,Park, Ho-Jin,Kim, Han-Gyeong 대한전자공학회 1995 전자공학회지 Vol.22 No.6

효율적인 feature map 추출 네트워크를 이용한 2D 이미지에서의 3D 포인트 클라우드 재구축 기법

김정윤,이승호,Kim, Jeong-Yoon,Lee, Seung-Ho 한국전기전자학회 2022 전기전자학회논문지 Vol.26 No.3

In this paper, we propose a 3D point cloud reconstruction technique from 2D images using efficient feature map extraction network. The originality of the method proposed in this paper is as follows. First, we use a new feature map extraction network that is about 27% efficient than existing techniques in terms of memory. The proposed network does not reduce the size to the middle of the deep learning network, so important information required for 3D point cloud reconstruction is not lost. We solved the memory increase problem caused by the non-reduced image size by reducing the number of channels and by efficiently configuring the deep learning network to be shallow. Second, by preserving the high-resolution features of the 2D image, the accuracy can be further improved than that of the conventional technique. The feature map extracted from the non-reduced image contains more detailed information than the existing method, which can further improve the reconstruction accuracy of the 3D point cloud. Third, we use a divergence loss that does not require shooting information. The fact that not only the 2D image but also the shooting angle is required for learning, the dataset must contain detailed information and it is a disadvantage that makes it difficult to construct the dataset. In this paper, the accuracy of the reconstruction of the 3D point cloud can be increased by increasing the diversity of information through randomness without additional shooting information. In order to objectively evaluate the performance of the proposed method, using the ShapeNet dataset and using the same method as in the comparative papers, the CD value of the method proposed in this paper is 5.87, the EMD value is 5.81, and the FLOPs value is 2.9G. It was calculated. On the other hand, the lower the CD and EMD values, the better the accuracy of the reconstructed 3D point cloud approaches the original. In addition, the lower the number of FLOPs, the less memory is required for the deep learning network. Therefore, the CD, EMD, and FLOPs performance evaluation results of the proposed method showed about 27% improvement in memory and 6.3% in terms of accuracy compared to the methods in other papers, demonstrating objective performance.

기판 및 열처리 온도에 따른 SrWO₄:Dy³⁺, Eu³⁺ 형광체 박막의 특성

김정윤,조신호,Kim, Jungyun,Cho, Shinho 한국재료학회 2016 한국재료학회지 Vol.26 No.10

$Dy^{3+}$ and $Eu^{3+}$-codoped $SrWO_4$ phosphor thin films were deposited on sapphire substrates by radio frequency magnetron sputtering by changing the growth and thermal annealing temperatures. The results show that the structural and optical properties of the phosphor thin films depended on the growth and thermal annealing temperatures. All the phosphor thin films, irrespective of the growth or the thermal annealing temperatures, exhibited tetragonal structures with a dominant (112) diffraction peak. The thin films deposited at a growth temperature of $100^{\circ}C$ and a thermal annealing temperature of $650^{\circ}C$ showed average transmittances of 87.5% and 88.4% in the wavelength range of 500-1100 nm and band gap energy values of 4.00 and 4.20 eV, respectively. The excitation spectra of the phosphor thin films showed a broad charge transfer band that peaked at 234 nm, which is in the range of 200-270 nm. The emission spectra under ultraviolet excitation at 234 nm showed an intense emission peak at 572 nm and several weaker bands at 479, 612, 660, and 758 nm. These results suggest that the $SrWO_4$: $Dy^{3+}$, $Eu^{3+}$ thin films can be used as white light emitting materials suitable for applications in display and solid-state lighting.

자동변속기장착 차량의 Shift-By-Wire 시스템 개발

김정윤,임충혁,임원식,Kim, Jung-Yun,Yim, Chung-Hyuk,Lim, Won-Sik 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.4

This article deals with the design and prototyping of Shift-By-Wire system for an automatic transmission equipped vehicle. In order to manipulate the shifting action electronically, Shift-By-Wire system consists of an electronic shift lever, an electric shift actuator and position sensors. The shift lever is designed to transform the driver's shifting command into an electric signal; it includes the position sensor using non-contact type hall sensor and an additional shifting switch acting as Tip-tronic. For the design of an electric shifting actuator, we investigated the stroke angles and shifting efforts of the manual control lever in each shifting section. And the position sensor of the shifting actuator is designed by using a potentiometer with an optical encoder. Finally the prototype of Shift-By-Wire system was built in a conventional 2.4L class SUV vehicle, and we performed road tests in order to verify its performance.