레일리 페이딩 환경에서의 적응 부호화를 이용한 적응변조 방식의 성능분석

신인식(In-Shik Shin),오정훈(Jeong-Hoon Oh),황태욱(Tae-Wook Hwang),김영수(Young-Soo Kim),서덕영(Duk-Young Suh),김진상(Jin-Sang Kim) 한국통신학회 2005 한국통신학회 학술대회논문집 Vol.2005 No.11

WCDMA 시스템에서 멱승법 빔형성 알고리즘의 성능개선

최철준(Chul-Joon Choi),신인식(In-Shik Shin),오정훈(Jeong-Hoon Oh),황태욱(Tae-Wook Hwang),김영수(Young-Soo Kim) 한국통신학회 2005 한국통신학회 학술대회논문집 Vol.2005 No.6

8-VSB DTV 신호의 효율적인 x dB 대역폭 측정 기법

황태욱(Tae-Wook Hwang),신인식(In-Shik Shin),오정훈(Jeong-Hoon Oh),김영수(Young-Soo Kim) 한국통신학회 2005 한국통신학회 학술대회논문집 Vol.2005 No.11

TMS320C6701 DSP 보드를 이용한 OFDM 모뎀 구현

오정훈(Jeong-Hoon Oh),황태욱(Tae-Wook Hwang),최철준(Chul-Joon Choi),신인식(In-Shik Shin),김영수(Young-Soo Kim) 한국통신학회 2005 한국통신학회 학술대회논문집 Vol.2005 No.6

하지 절단자 보행의 운동역학적 분석

임규찬,박윤서,배성제,정철수,신인식,김복영 師範大學 體育硏究所 1994 서울大學校 體育硏究所論集 Vol.15 No.2

This study was conducted to investigate the biomechanical characteristics of the gait pattern in an amputee for the purpose of improving the proper gait posture and designing the prosthetic. The subjects were six males amputees and one normal person. The ground reaction force was measured using AMTI force platform. The conclusions were as follows; 1. In case of amputee group, the ground reaction force was revealed in specific figure according to position in which they used the prosthetic, whereas in case of normal person the ground reaction force was revealed in the figure of two humps in regard of vertical axis. 2. In case of amputee group, the ground reaction force in time between fight foot contact and left foot contact was deviated from a figure of rectangle, whereas in case of normal person the ground reaction force was revealed in the figure of rectangle. 3. In case of amputee group, the ground reaction force referred to both feet angle point of view was revealed in irregular figure, whereas in case of normal person the ground reaction force was revealed about 47。

멀티미디어 서비스에 적용 가능한 적응 변조 및 부호화 기법

신인식,오정훈,김영수,서덕영,김진상 경희-다반 ASIC 설계교육센터 2005 경희-다반 ASIC센터 논문집 Vol.6 No.-

적응 변조 기법은 통신 채널의 환경 변화에 따라 가장 적당한 변조기법을 선택하여 평균 전송 오류율을 정해진 값 이하로 유지하면서도 단일 변조 기법에 비해 더 많은 정보량을 전송하는 방법이다. 본 논문에서는 변조 기법을 선택하기 위한 스위칭 문턱 값을 최적화하여 실제적으로 전송 가능한 이론적인 최대 정보 전송량을 보장하는 기법을 채용한 적응변조 기법을 소개하고 그 성능을 단일 변조 기법 및 적응 변조 기법과 적응 부호화 기법을 사용했을 때의 성능을 비교 고찰한다.

테니스 경기분석을 통한 선수의 수행능력 평가

우상연,신인식 한국운동역학회 1998 한국운동역학회지 Vol.8 No.2

The purpose of this study was to explore the use of three dimensional analysis techniques for match analysis in tennis. It was determined that temporal and kinematic parameters obtained from 3D video analysis of the 32 finalists in the 1997 Korean Final CUP provided insight into successful performance. These parameters included success of first service, distance of receiving player from the ball, hight of stroke impact, and player movement pattern. The entire matches of the 32 finalists in the men's singles tennis tournament were recorded on videotape. Six video cameras which operated at the rate of 60 Hz were used; two video cameras captured the whole view of the court, two captured one side of the court, and two captured the other side. The following observations were made from the data analysis; ⒜ the success of the first service increased both the rate of success and the rate of score, ⒝ the mean interval time for player A from service to contact ground was longer than player B and the mean interval time for player A from ground to impact was shorter than player B , ⒞ both players A and B used the mostly ground strokes (above 85% of all strokes), ⒟ player A predominately used backhand slices to return the ball from the backhand side of the court; whereas, player B used backhand ground stroke, ⒠ the area and distance covered by player B was greater than player A, and ⒡ player A was closer to the approaching ball when it rebounded from the court and that his racket impacts the ball at a higher point than player B on his service and backhand strokes.

DSP 보드를 이용한 OFDM 모뎀 구현

오정훈,신인식,김영수,서덕영,김진상 경희-다반 ASIC 설계교육센터 2005 경희-다반 ASIC센터 논문집 Vol.6 No.-

본 논문에서는 무선 멀티미디어 서비스를 위해 요구되는 고속의 데이터 전송에 적하한 Orthogonal frequency Division Multiplexing(OFDM) 모뎀을 Texas Instrument(TI)사의 범용 DSP 프로세서인 TMS320C6701을 기반으로 한 PCI/C6701 보드를 이용해서 소프트웨어로 설계하였다. 모듈은 크게 보드를 제어할 수 있는 타겟 프로그램과 호스트 프로그램으로 구성되며, 타겟 프로그렘은 IEEE 802.11a Wireless LAN 규격 시스템으로 이루어지고, 호스트 프로그램은 타겟 프로그램의 다운로드와 BSP 프로세서에 의해 처리된 데이터의 디스플레이 또는 저장으로 이루어진다.

멀리뛰기 발구름 동작시 아킬레스건각이 도약속도와 도약각도에 미치는 영향

김복영,배성제,신인식,정철수,임규찬 師範大學 體育硏究所 1992 서울大學校 體育硏究所論集 Vol.13 No.2

The purpose of this study was to investigate the effect of lower leg planting angle an on take-off motion of the long jump. The Achilles tendon angle defined as the angle between shank and calcaneus with projection to XY plane was introduced to interprete lower leg motion uring last foot touch for the flight phase of long jump. A typical high speed film analysis technique including DLT method was adapted to record and analyze total of nineteen long jumps performed by elite athletes at two different track and field events. The following were found that: 1. The relationship between touch-down velocity, take-off velocity, range of vertical velocity and flight length were significantly related each others as r=0.6383, 0.6395 respectively at t=0.01 level. 2. It was not possible to reveal the relationship between take-off angle and flight length. Due to highly consistent take-off angles shown between the long jumpers. 3. The angular displacement of the shank during the last foot contact just before flight phase was negatively related to the flight length(r= -0.6149). However, it was not possible to find the relationship between the aehilles tendon angle and flight length. 4. As the range of the body C.O.G lean angle increased the last step foot contact time significantly increased(r=0.8625). 5. The foot contact time of Korean elite long jumpers was somewhat longer than that shown by foreign Athletes. It is concluded that maintaining touch-down velocity during initial phase of foot touch and increasing take-off velocity would result optimal take-off angle and good record. Decrease in the angular displacement of the shank, foot contact duration, and the range of body C.O.G lean angle were found to be important to improve the flight length.

멀리뛰기 발구름 동작의 운동역학적 변인과 기록간의 다중 회귀식

신인식,배성제 師範大學 體育硏究所 1995 서울大學校 體育硏究所論集 Vol.16 No.1

When the long jump motion is considered as simple projectile motion, the flight distance is determined by the initial state of athlete's motion which include the takeoff velocity, takeoff angle, angular momentum at the moment of takeoff. However, due to the construction of human body distinctive movement patterns during the run-up, takeoff, flight, and landing phases are evolved. It was considered that a common movement pattern as well distinctive movement patterns between athletes might be identified. This study was conducted to investigate the biomechanical relationship between the long jump takeoff motion and flight distance performed by elite athletes for the purpose of increasing flight distance during the last stride for run-up and takeoff phases in the long jump. Eight male athletes who achieved at least the 3rd place in the long jump at the Korea National Track and Field meetings during 1993 and 1994 were selected as subjects. The long jump motions performed by the subjects were recorded two 16mm high speed cameras at the nominal speed of 100 frames per second. The Direct Linear Transformation technique was adopted from the beginning of filming to the final stage of data extraction. The movement patterns during the last stride for run-up, takeoff, and the flight distance were related using forward stepwise regressional method with the consideration of biomechanics. It was found that: The mean takeoff velocity of the subjects at the instant of takeoff was 7.911±0.245m/s, and the mean height of takeoff of the center of gravity at the instant of takeoff was 1.088±0.048m, or 60.34±1.78% of the mean height of the subjects. Also the mean takeoff angle at the instant of takeoff was 21.50±2.60。, the mean shank angular velocity at the instant takeoff was -4.96±2.48rad/s. By the takeoff motion, multiple regression equation of flight distance prediction was Y (flight distance)=3.1906RV(takeoff velocity at the instant takeoff + 5.2941H(C.O.G height at the instant takeoff) -0.0367SHA (shank angular velocity at the instant takeoff)+0.0052BODY² (body lean angle at the instant takeoff)-0.1712BODY+2.2335 (R²= 0.83, p<0.0000). Within the limitations of this study it is concluded: In order to increase flight distance, a few conditions must be fulfilled at the instant of takeoff leg touchdown and takeoff during takeoff phase. First, the takeoff velocity should be fast at the instant of takeoff leg touchdown and takeoff. Second, the body C.O.G (Center of Gravity) hight should be raised at the instant of Takeoff leg touchdown and takeoff. Third, the foot contact time should be short during takeoff phase and the takeoff distance should be long at the of takeoff. Forth, the total forward angular momentum with respect to a transverse axis through the center of gravity should be raised at the instant of takeoff leg touchdown and takeoff. Fifth, the active landing style should be performed as the sole of the takeoff foot might claw ground instant of the takeoff leg touchdown and takeoff. These conditions all make positive effect on the takeoff distance and it is concluded that a slightly greater takeoff leg knee angle (161.9±6.1。) and body lean angle (18.5±3.4。) in the range of the subject's motion at the instant of takeoff would result in increasing the flight distance.