인접 안테나의 채널정보 되먹임을 위한 가중치 전송법의 개선

정창규 韓國交通大學校 2023 한국교통대학교 논문집 Vol.58 No.-

This paper propose the method of transmitting weight information between the adjacent antennas of mobile station and the entire antennas of base station through the selected antenna of mobile station. A channel sounding system is composed in four parts. the first part estimates channel matrix between all antennas of base station and the selected antenna of base station, the second one receive each weight information, the third one combines weights that are obtained from all antennas of base station and the fourth recover channel information between the adjacent antenna of mobile station and the base station's antenna. the proposed method shows that channel estination time is increased a little and the signal energy for channel sounding is reduced, but the diversity gain is increased by combing the signals received at basse station. Also the system have superior channel sounding performance to conventional method in the communicaion envirenment that have much change.

시공간 상관 MIMO 채널 시뮬레이터의 구현

정창규 忠州大學校 2008 한국교통대학교 논문집 Vol.43 No.-

This paper proposes a MIMO(Multi Input Multi Output) simulator with a SCM(Spatial Channel Model) that is suitable to a next mobile communication system with multiple antenna techniques. It is shown that SCM simulator have characteristics of temporal spatial correlation and delay spread. A proposed simulator is used as reference channel simulator in case of comparing with competitive techniques on mobile communication and analysing interference between other systems.

밀리미터파 전파특성과 57_(㎓) 고정통신 기술 분석

정창규 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-

This paper have a analysis on the propagation characteristics of millimeter wave band. Wireless services above 57GHz frequency band are proposed and core technologies to realize this system are studied. System design parameters at 60/70/80/95GHz band are considered. Additional consideration that is needed in point-to-point service and point-to-multipoint service as ARQF, AMC, space diversity are analyzed. In korea, communication systems above 57GHz band are studied only in the field of transmitter/receiver development and point to point fixed communication system s. Therefore new services and systems to use 57GHz upband efficiently should be proposed.

지속가능발전교육 관점에 입각한 웹기반 기후변화 환경교육이 초등학생의 환경 인식 및 태도에 미치는 영향

정창규,이상원 이화여자대학교 사범대학 교과교육연구소 2010 교과교육학연구 Vol.14 No.3

본 연구는 웹기반을 활용한 기후변화 환경교육이 초등학생의 환경 인식과 태도에 어떠한 영향을 미치는지 알아보고자 하였다. 이를 위해 선행연구 고찰을 통하여 웹기반을 활용한 기후변화교육에 관한 교수·학습 모형 및 프로그램을 개발하고, 학습 현장에 적용하였다. 그 효과를 검증하기 위한 검사지는 황수정(2009)이 개발한 설문지를 재구성하였으며, 연구과정에서 얻어진 정량적 자료는 SPSS 12.0 프로그램을 이용하여 분석하고, 정량적 분석의 한계를 보완하기 위하여 정성적 분석을 실시하였다. 본 연구의 결과는 첫째, 지속가능발전 관점에서 바라본 기후변화에 관련된 내용을 추출 및 재구성하여 웹기반을 활용한 기후변화 환경교육을 위한 교수·학습 모형을 개발하고, 이를 바탕으로 환경교육 프로그램을 구안 및 적용시켰다. 둘째, 웹기반을 활용한 기후변화 환경교육 프로그램이 초등학생의 환경 인식 및 태도에 긍정적 영향을 미쳤다. 셋째, 웹기반을 활용한 기후변화 환경교육 프로그램의 적용은 지식적 측면에서는 차이를 보이진 않았다. 넷째, 웹기반을 활용한 기후변화 환경교육 프로그램을 적용한 후에 환경 인식이 높은 학생일수록 환경태도가 높게 나타났다. 결론적으로 웹기반을 활용한 기후변화 환경교육 프로그램은 초등학교 학교현장에 적용 가능하며, 다양한 환경교육 방법이 요구되고 있는 시점에서 새로운 교육방법으로써 그 가치가 크다고 할 수 있다. 차후 이와 관련된 심층적인 연구와 교수ㆍ학습 활동에 관한 후속 연구가 필요하다고 본다. The purpose of this study was to investigate the influence of the web-based climate change educational program on environmental awareness and attitudes of 5th grade elementary school students in Gyeonggi-Do. The students were divided into an experiment group and a control group. A reconstructed questionnaire through Hwang(2009)`s test tool was used to survey the affects of web-based climate change educational programs. The SPSS 12.0 program was used to analyze the results. The major results of this study were as follows: First, the researcher was able to develop and apply a professor-learning model for web-based climate change environmental education by extracting and recreating the climate change-related contents from 5th and 6th grader curriculum. Second, the web-based climate change educational program had a positive effect on elementary school students’ environmental awareness and attitude. Third, after implementing the web-based climate change educational program, the students with higher environmental awareness showed a higher regard for the environment. In conclusion, the web-based climate change educational program was effectively used on elementary school students and the program proved to have a positive affect on 5th graders’ environmental awareness and attitude. Therefore, in-depth study and follow-up research on teaching and learning activities should be highly considered.

광패턴 인식을 위한 pSDF와 이진결합 변환 상관기의 실현 ( Implimentation of pSDF and Binary Joint Transform Correlator )

정창규,박성균,김경태,박한규 한국통신학회 1990 한국통신학회 학술대회논문집 Vol.9 No.1

RF설계 파라미터를 이용한 CDMA2000 이동국의 최소규격분석

정창규 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.3

In this paper, a receiving system specifications of a CDMA2000 mobile station are analyzed based on the CDMA2000 3GPP2 MS Minimum Performance. Lately the minimum performance for the CDMA2000 mobile station was recommended. But the specification was given with the value of FER under certain conditions. This value is the reference to decide the design parameter. therefore system parameters for the CDMA2000 mobile station such as noise figure, selectivity, dynamic range, and intermodulation are derived and simulated based on the 3GPP2.

이동 WiMAX 시스템 레벨 시뮬레이터 구현

정창규 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-

In this paper the system level simulator(SLS) of a Mobile Wimax system is realized. A SLS analyze a lot of performance of MIMO(Multiple-Input Multiple Output) mode 0, MIMO mode 1, MIMO mode 2, MIMO mode 4 in lots of circumstance. Simulation results show that capacity of mode 4 is more reduced than mode 2 according to a reduced number of feedback CQI(Channel Quality Indicator).

평면 MIMO 시스템의 수직 배열 안테나 채널 특성

정창규 韓國交通大學校 2013 한국교통대학교 논문집 Vol.48 No.-

In this paper, vertical wireless channel characteristics of planar MIMO system is analyzed by using 3D ray-tracing simulator, Wireless Insite in microcell environments. The analysis shows that increasing the height of transmit antennas results in the higher angular spread and direction of departure. On the other hand, increasing the distance between transmit antennas to receive antennas results in the smaller angular spread and direction of departure.

제한된 부호행렬을 사용한 이동국 선택 기법

정창규 한국교통대학교 2020 한국교통대학교 논문집 Vol.55 No.-

This paper propose the method of providing high data rate to mobile in a service area using a restricted code matrix in a time division duplex system. Normally conventional methods dicide the channel circumstance of each mobile station at a base station. This method calculate the signal to interference plus noise ratio of a forward channel at each mobile station and each mobile station send he signal to interference plus noise ratio, the index of a restricted precode matrix and selected coulmn vector. the conventional method maximize signal power of mobile station in spite of not knowing the interference with adjacent mobile station. But a proposed method achieve high performance because of knowing the interference with adjacent mobile station. Simulation results show that the throughput of system increase with a highly correlated antena and increasing the number of mobile station makes a throughput increasing slightly. Also a highly correlated system provide 1.17 times higher throughput than a loosely correlated system.

BTS 기반 Coordinated SDMA와 MMSE SDMA의 평균섹터용량

정창규 忠州大學校 2011 한국교통대학교 논문집 Vol.46 No.-

In this paper, for TDD system, BTS based SDMA technique is proposed to use reciprocity between the up-down links. A BTS based coordinated SDMA select a weighting vector from a predicted up link channel without feedback from AT to BTS. A MMSE SDMA calculate a transmitted weighting vector and MCS level for all AT in sectors and perform a rank adaptation and multiuser scheduling. a system level simulation shows that a coordinated SDMA with 4 interference power have similar performance with knockdown SDMA technique and is superior to MMSE SDMA technique.