이훈희 교수

This paper proposes a MIMO-OFDM scheme reducing the computational complexity and providing comparable performance to QRD-M detection scheme in IEEE 802.11n. The proposed scheme checks the channel condition per subcarrier and then selects either ordered DFE scheme or adaptive QRD-M detection scheme according to that information. The post-detection SNR which judges channel condition depends on Moore-Penrose pseudo-inverse matrix G. The proposed scheme selects the ordered DFE detection scheme in ca

To obtain both spatial multiplexing and diversity gains simultaneously, hybrid system was introduced in MIMO-OFDM system, which combines space time coding (STC) and spatial division multiplexing (SDM) schemes. Therefore, hybrid system achieve both multiplexing and diversity gains by reducing a little performance. Representative hybrid system is consisting as space time block coding (STBC) and spatial multiplexing (SM) symbols. However,the hybrid system has the almost same bit error rate (BER) pe

The purpose of this study was to explain the influence of depression on the life satisfaction of the elderly with hypertension. Also, we were focusing whether there is a mediating effect of subjective health status between depression and life satisfaction of the elderly with hypertension. 2,198 persons with hypertension over 65 years of age were selected from the data of KLoSA(Korean Longitudinal Study of Ageing), administered by The Korea Employment Information Service in 2014. Life satisfactio

This paper proposes a MIMO detection scheme reducing the computational complexity and providing comparable performance to the QRD-M detection scheme for MIMO-OFDM systems. The proposed scheme checks the channel condition per subcarrier and then selects detection scheme either ordered DFE scheme or adaptive QRD-M detection scheme according to that information. The post-detection SNR, which judges channel condition, depends on Moore-Penrose pseudo-inverse matrix G. The proposed scheme selects the

This study is an objective research to verify causality between social worker's social capital and OCB in Jeon-nam province including Kwangjoo. Survey was done directly from 255 social workers working in social welfare facilities. Study methodology was the structural equation to verify the influence of social capital on organized citizens' activities and the mediator effect of job satisfaction and organizational commitment. Using Fornell and Locker's two-step approach, this study verified the si

이 연구는 중 · 고등학생이 인지하는 체육수업의 케어링분위기와 운동정서 및 수업몰입 간의 관계를 규명하는데 목적이 있다. 이를 위해 연구대상자는 서울, 경기, 충남 지역의 중 · 고등학교 학생들을 모집단으로 선정한 후 편의표본추출법을 이용하여 460명의 표본을 추출하였으며, 이 중 응답의 일관성이 결여되고 불 성실한 설문지 21부를 제외하고 총 439명의 자료를 최종분석에 사용하였다. 수집한 자료의 처리는 SPSS 23.0 프로그램을 활용하여 빈도분석, 탐색적 요인분석(exploratory factor analysis), 상관관계분석(correlation analysis), 다중회귀분석(multiple regression analysis)을 실시하였다. 이상의 과정을 통해 도출한 결론은 다음과 같다. 첫째, 케어링분위기는 운동정서의 하위요인인 긍정정서에 정(+)적인 영향을 미치는 것으로 나타났으며, 부정정서에 부(-)적인 영향을 미치는 것으로 나타났다. 둘째, 케어링분위기는 수업몰입

The conventional PLL(phase locked loop) frequency synthesizer takes a long switching time because of the inherent closed-loop structure. The digital hybrid PLL(DH-PLL) which includes the open-loop structure into the conventional PLL synthesizer has been studied to overcome this demerit. It operates in high speed, but the hardware complexity and power consumption are the serious problem because the DLT(digital look-up table) is usually implemented by the ROM which contains the transfer characteri

본 연구는 국내에서 수행된 수중 운동 중재가 노인의 하지 근력에 미치는 효과를 체계적으로 고찰하고, 메타분석을 통해 그 통합적 효과를 정량적으로 제시하는 데 있다. 이를 위해 2000년 1월부터 2025년 8월까지 발표된 논문을 대상으로 RISS, KCI, DBpia, E-article, Scholar 등 주요 학술 데이터베이스를 검색하였으며, 수중 운동(aquatic exercise)을 중재로 하고 하지 근력(lower-limb strength)을 결과 변수로 제시한 운동 중재 연구만을 선정하였다. 최종적으로 11편의 문헌이 체계적 고찰 대상에 포함되었고, 이 중 효과 크기 산출이 가능한 5편이 메타분석에 활용되었다. 무작위 효과모형을 적용한 결과, 수중 운동은 노인의 하지 근력 향상에 유의한 효과를 나타냈으며(표준화 평균차 SMD = 0.64, 95% CI 0.25–1.02), Trim and Fill 방법으로 출판편향을 보정한 이후에도 효과는 유지되었다(SMD = 0.46, p

This study aims to investigate the relationship between middle and high school rugby players' achievement goal propensity, self-regulation, and exercise continuity intention. Data from 423 middle and high school rugby players were used for the final analysis. For data processing, exploratory factor analysis, reliability analysis, multiple regression analysis, and correlation analysis were applied using SPSS 21.0. The conclusions are as follows. First, as a result of analyzing the relationship be