RFID 기술을 이용한 실내 위치 추적

윤창선,김태인,김현진,홍연찬,Yoon, Chang-sun,Kim, Tae-in,Kim, Hyeon-jin,Hong, Yeon-chan 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.1

RFID 기술은 리더와 태그( Tag)라는 장치를 이용하여 정보를 인식하는 기술로 현재 대중교통 및 고속도로 하이패스 등에 사용되고 있다. 본 논문에서는 RFID 기술을 응용해 실내에서 물체의 위치를 추적하는 시스템을 설계하고자 한다. 대표적인 위치추적 시스템인 GPS는 비가 오거나 실내 공간 또는 지하에서는 효율이 좋지 않고 오차가 커지는 단점이 있다. 제안된 RFID 실험은 실내에서 배치된 물체의 이동에 따른 신호의 변화를 시뮬레이션 하고 실제 실험과 비교하여 위치추적에 필요한 데이터를 산출한 후 그 데이터를 근거로 이동경로와 오차를 분석하여 향후 추적시스템에 필요한 자료를 제공한다. 위치 추적에 필요한 시뮬레이션은 실제 물체의 이동 경로를 분석하여 수행하였고 실제 실험에서는 RFID 기술을 이용하여 실내 곳곳에 리더를 설치한 환경에서 위치를 알고자 하는 물체에 태그를 장착시키고 이동시킨 후 실험 장비에서 얻어낸 데이터를 분석하였다. 본 논문에서는 획득한 데이터를 분석하여 향후 실내 위치 추적이 필요한 시스템에 활용될 수 있도록 관련 분석값을 제시하였다. RFID를 통한 위치 파악 데이터는 위치에 따른 태그 판별 결과를 보여주며 분석된 데이터는 추후 실내 위치 파악 연구에 활용될 것으로 기대된다. RFID technology is a technology perceiving information with the device called reader and tag which is now used in public transportation such as Hi-pass. In this paper, we design a system which tracks indoor location using this technology. GPS, the most frequently used location-tracking system, has a defect that its accuracy decreases when the device is indoor. In suggested experiment, we simulate signals according to the moving of located objects, then compare with the result of the experiment. Based on the extracted data, we inform data which is for the purpose of tracking system based on analysis of the route and errors. Simulations for the tracking were performed with relocation of real objects. In the real experiment, we arrange the readers around the room and move the tagged object that we like to know the location, then analyze the data from the equipment. This paper suggests the analyzed data for the future indoor tag tracking applications. We expect that the RFID based location positioning data will be used for other indoor positioning research and development.

도마운동 유리첸코 몸 펴 공중돌기 동작의 운동학적 분석

윤창선,김태삼,윤희중,Yoon, Chang-Sun,Kim, Tae-Sam,Yoon, Hee-Joung 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3

The purpose of this study is to investigate the effective skill motion through the kinematic analysis of the Yurchenko Streched motion in new horse vaulting. The subjects in this study were 3 male gymnasts who were ranked as national athletes. After the 3D motion analysis, kinematic variables were analyzed to comparison with the difference between this study and the previous study(Yang, D. Y and Lee, C. S, 1999). As a result, the following conclusions was drawn; 1. In the board contact phase, this study showed a shorten contact time to maintain in condition highly extension of hip and hee angle than the previous study. 2. In the pre-flight phase, this study appeared more shortly flight duration time and horizontal flight displacement than the previous study. 3. In the horse contact phase, the contact duration time and horizontal displacement of COG shortened than the previous study, but appeared to the fast horizontal and vertical velocity and highly extension of shoulder an. 4. In the post-flight phase, a stable horse contact appeared to the increase of the flight duration time and the apex height during the post-flight. And it showed that these results have a stable and good landing.

RFID를 기반으로 한 실내 위치 파악 및 효율적 Tag 배치

윤창선(Yoon, Chang-Sun),윤동민(Yoon, Dong-Min),권영찬(Kwon, Young-Chan),홍연찬(Hong, Yeon-Chan) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.12

본 논문에서는 실내에서의 정확한 위치 파악을 하여 넓은 실내에서 사람의 길 안내 및 로봇 청소기 등의 위치 파악에 적용 할 수 있는 기술을 개발 하고자 한다. 이를 위해 RFID tag를 지면에 부착하여, tag 배치 패턴을 다르게 하면서, 위치 파악을 하는데 있어서 어떤 패턴이 오차가 적은지를 확인하고자 한다. 연구에는 MT92(900MHz대 안테나)와 ALR 9900+(리 더기)를 이용하여 실험을 하였다. 그 결과 마름모, 직사각형, 정육각형 그리고 정사각형 tag 배치 중 정사각형 배치에서 21.19cm의 적은 오차를 확인하였다. 그러나 단위 면적 당 배치된 tag수가 6개인 정육각형 배치를 함께 고려하였을 때, 정육각 형 배치가 비교적 효율적인 배치라는 것을 확인하였다. In this paper a technology which gives directions to people and also localization of the robotic vacuum cleaners inside some spacious buildings is developed. For this purpose, it is confirmed that which pattern has a small error in dealing with the indoor localization with various RFID tag arrangements attached on the ground. This experiment was conducted by using MT92(900MHz range Antenna) and ALR 9900+(Reader). As a result, the square arrangement has the least error, 21.19cm, among other patterns which are diamond, rectangle and regular hexagon. However, it is necessary to consider the number of tags in the unit area, from this point of view the regular hexagon arrangement is the most efficient arrangement among other patterns because it needs only 6 tags in the unit area.

도마 유리첸코 동작 시 숙련도에 따른 운동학적 차이

윤창선 ( Chang Sun Yoon ),김태삼 ( Tae Sam Kim ) 한국운동역학회 2006 한국운동역학회지 Vol.16 No.2

여자 도마 유리첸코동작의 숙련도에 따른 운동학적 요인 비교

윤창선(Yoon Chang-Sun),민아영(Min A-Young),하종규(Hah Chong-Ku),박종철(Park Jong Chul),이장형(Lee Jang Hyung) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.4

The purpose of this study was to compare kinematic factors according to skill levels of women's Yurchenko motion in new horse vaulting. For this study, 6 national female-gymnasts participated in this experiment. The four digital video cameras(Sony, PD-150) were used to record motions. Kwon3D 3.0 was used to process data and analyze for factors. In conclusion, a high CoG of skilled group in comparison with non-skilled group was produced by a horizontal forward velocity from board contact phase and a vertical velocity at taking off horse vault. Therefore, Increasing the height of leap generated an easy and composed aerial rotation and that performed a safe landing motion.

평행봉 몸 접고 2회전 뒤 공중 돌아내리기 동작의 성공 요인

윤창선(Yoon Chang-Sun),하종규(Hah Chong-Ku) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2

The purpose of this study was to evaluate the success factors of the Double Salto Backward Piked Dismount in the parallel bar in gymnastics. For this study, 3 national male-gymnasts participated in this experiment. The two digital video cameras(Sony, PD-150) were used to record motions. Kwon3D 2.1 was used to process data and analyze for factors. The results were as follows: First, at down swing, a rapid vertical, horizontal velocity and angular velocity of hip joint made swing and vertical motion large, and then they were helpful to acquire a rotation effect and airborne height efficiently. At release, whip-swing was strong and rapid because at maximum hip extension small scapular angle cause them to swing down near body, that is, hip joint sustained large extension. Second, because a large scapular angle and a rapid angular velocity of hip joint by means of rapid vertical velocity made position high and whip-swing strong at release, they made the salto high and rotation efficient. Third, long spent time and a high vertical height of hip joint made room to rotate the Double Salto Backward Piked Dismount during airborne phase. A small angle of hip joint and a rapid vertical velocity made stable landing efficiently. In conclusion, success factors of the Double Salto Backward Piked Dismount were a small horizontal displacement, a high vertical displacement, the rapid velocity of rotation and the high vertical position during landing. Therefore, they produced stable airborne and landing motions.

도마 Tsukahara 몸 펴 720도 비틀기 동작의 오류 진단과 교정

윤창선 ( Chang Sun Yoon ),신형욱 ( Hyung Ook Shin ) 한국체육대학교 체육과학연구소 2014 스포츠사이언스 Vol.31 No.2

본 연구의 목적은 제 17회 아시아경기대회를 대비하여 훈련 중인 CJS 선수의 도마 Tsukahara 몸 펴 720도 비틀기 동작의 3차원 영상분석을 통하여 오류를 진단하고 교정방법을 제시함으로서 완벽한 연기를 구사할 수 있게 하는데 있다· 이를 위해 국가대표 1차선발전과 최종선발전에서 수행된 CJS 선수의 Tsukahara 몸 펴 720도 비틀기 동작을 분석하였다· 3차원 영상분석은 Sony PD-150 비디오카메라 2대를 이용하여 운동학적 변인을 분석한 결과 다음과 같은 결과를 얻었다· ① 발구름 국면동안 신체의 지지각도를 크게 하는 것은 구름판 이륙 시 신체중심의 수평성분을 수직성분으로의 전환이 용이할 뿐만 아니라제 1비약 체공시간을 짧게 하여 도마 착수를 빠르게 하는 것으로 나타났다· ② 도마 접촉국면 시 신체중심의 수평, 수직속도의 증가는 공중회전 시 높은 신체중심의 위치 확보와 체공시간을 길게 하여 원활한 공중회전이 이루어지는 것으로 나타났다· ③ 최대정점 시 고관절각을 크게 하는 것은 공중회전의 용이함과 안정된 착지동작을 유도하는 것으로 나타났다· The purpose of this study was to inform a national gymnast (CJS) who had trained error motions and correction methods of Tsukahara Stretch 2/1 Turn motion in Vault for improving competitive performance for 17th Asian Games· For this study, The Tsukahara Stretch 2/1 Turn motion of CJS had been diagnosed from 1st picking out-game, after his motion was corrected by means of information on correcting error motions· and then, it were dignosized from 2nd picking out-game with 3D image analysis· Two digital video cameras (Sony PD-150) used to capture images for 3D analysis· The results were as following; ① Supporting body-angle was large during board contact phase because the horizontal and vertical velocities of CoG was increased at taking off board and the shortening aerial time during pre-flight phase made touching vault rapid· ② Increasing the horizontal and vertical velocities of CoG at taking vault made aerial motion high CoG and long aerial time during post-flight· · Increasing flight-height during post-flight caused hip joint angle to be large at maximal height, and then stable landing was performed due to CoG raised by way of the easy movement of aerial rotation· Therefore, it is concluded that these diagnoses might enhance the competitive performance of gymnast in Vault·

도마 Yurchenko 몸 펴 공중돌기 동작의 운동학적 분석

윤창선(Yoon Chang-Sun),민아영(Min A-Young) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.1

The purpose of this study is to investigate effects of kinematical variables performed from Yurchenko Stretched skill in horse vaulting. Four national woman gymnasts participated in this study, and four PD-150 video cameras were used to capture motions for three dimensional analysis. The conclusions are as followings: The CoG height of S2 is higher than S1 in post flight phase by means of increasing horizontal velocity at touching board and vertical velocity at taking off board. Those make stable landing postures. The rapid horizontal velocity of S4 both at peak and at landing make unstable landing postures. The vertical velocity of S2 (2.28 ㎧) is much faster than that of S4 (1.36 ㎧) when they take off board. That is an important factor that decides successful motions. Also CoG of S4 is low as she moves to forward direction with scapular angle of S4 not full extending. S1 and S4 have pertinent blockings doing arm into flexion and extension compared to S2 and S3.Trunk angles of S1 and S4 at taking off board are greater than S2 and S3. That make their bodies approaching the horse too closely, and then they can't control themselves. Therefore, they can't move vertical motions. At touching down board, S1 and S4 contacted board with knee joint angle moving flexion, and at taking off board, they take off the board with knee joint angle moving extension. But, S1 suffers difficulty on vertical rise motion because S1 don't extend knee joint completely compared to other subjects.

아코피안 동작의 오류 진단과 교정

윤창선(Yoon Chang-Sun),하종규(Hah Chong-Ku) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2

The purpose of this study was to inform a national gymnast, YTY who had trained error motions and correction methods of Akopian motion in Vault for improving competitive performance for 15th Asian Games. For this study, YTY‘'s Akopian motions had been diagnosed from 1st picking out-game, after his motion was corrected by means of information on correcting error motions. and then, it were diagnosed from 2nd picking out-game with 3D image analysis. Two digital video cameras (Sony PD-150) used to capture images for 3D analysis. The results were as following; ① Supporting body-angle was small during board contact phase because the horizontal and vertical velocities of CoG was increased at taking off board and the shortening aerial time during pre-flight phase made touching vault rapid. ② Making supporting body-angle large increased the horizontal and vertical velocities of CoG at taking vault off because of shortening time during touching vault. ③ Increasing the horizontal and vertical velocities of CoG at taking vault made aerial motion high CoG and long aerial time during post-flight. ④ Increasing flight-height during post-flight caused hip joint angle to be large at maximal height, and then stable landing was performed due to CoG raised by way of the easy movement of aerial rotation. Therefore, it is concluded that these diagnoses might enhance the competitive performance of gymnast in Vault.

TlGaxIn₁_xSe₂ Solid Solution의 광학적 특성 및 상전이에 관한 연구

윤창선(Chang Sun Yoon),김병호(Byong Ho Kim),차덕준(Duk Joon Cha) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.2

Bridgman 방법으로 성장된 TlGa_xIn_(1-x)Se₂ 단결정의 격자상수와 energy gap의 성분의존성을 조사하였다. TlGa_xIn_(1-x)Se₂ solid solution의 불연속 특성이 tetragonal과 monoclinic 구조를 가진 0.25<X <0.65의 성분영역에서 일어났으며, tetragonal 구조 (0.0≤X≤0.25)로부터 monoclinic 구조(0.65≤X≤1.0)로 변하는 구조적 상전이가 이 성분영역에서 관측되었다. TlGaSe₂ 단결정의 energy gap과 유전상수의 온도의존성으로부터 각각 1차 및 2차 상전이에 상당하는 107K와 120K에서 변칙특성을 발견하였다. An investigation was made of the dependences of the lattice constants and the energy gap on the composition of TlGa_xIn_(1-x)Se₂ single crystals grown by Bridgman method. It was found that a discontinuity in TlGa_xIn_(1-x)Se₂ solid solutions occurred in the composition range 0.25<X<0.65 with both tetragonal and monoclinic structure. Consequently, the structural phase transition from the tetragonal structure (0.0≤X≤0.25) to the monoclinic structure (0.65≤X≤1.0) was observed in this composition range. The temperature dependences of the energy gap and the dielectric constant in TlGaSe₂ single crystal have shown that the anomalies appeared at 107K and 120K corresponding to first-order and second-order phase transitions, respectively.