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PAPR Reduction Using Hybrid Schemes for Satellite Communication System
김재명,조자빈,이호위,손성환,Kim, Jae-Moung,Zhao, Zibin,Li, Hao-Wei,Sohn, Sung-Hwan Korea Society of Satellite Technology 2008 한국위성정보통신학회논문지 Vol.3 No.2
In the future, satellite communication systems, such as ISDB in Japan and DVB in Europe, are required to support higher transmission date rate for providing multimedia services including HDTV, high rate data communication etc. Considering the effectiveness of OFDM technique in efficient usage of frequency bandwidth and its robustness to the multi-path fading, several OFDM based standards have been proposed for satellite communication. However, the problem of high Peak to Average Power Ratio is one of the main obstacles for the implementation of OFDM based system. Many PAPR reduction schemes have been proposed for OFDM systems. Among these, the partial transmit sequences (PTS) is attractive as they obtain better PAPR property by modifying OFDM signals without distortion. In this paper, considering the complexity issue, we present a simplified minimum maximum (minimax) criterion and Sub-Optimal PTS algorithm to optimize the phase factor. This algorithm can be dynamically made tradeoff`f between performance and complexity on demand. In addition, we integrate guided scrambling (GS) with this method. Simulation in multiple antenna based OFDM system proves that the proposed Hybrid schemes can get much more PAPR reduction and do not require transmission of side information (SI). Thus it is helpful when implementing OFDM technique in satellite communication system.
이호(Li Hao) 국어문학회 2016 국어문학 Vol.61 No.-
본고는 중국 산둥지역 내 각 대학 한국어학과에 대한 실태조사를 통하여 한국어교육의 현황 및 문제점을 파악하고 그 발전 방향 및 전망을 제시했다. 1992년 한·중 수교 이후 한국어 인재에 대한 수요가 급증함에 따라 한국과 지리적으로 가까운 산둥지역은 한국어교육이 가장 밀집된 지역으로 부상하였다. 현재 산둥지역에는 국립대학, 전문대학 및 사립대학을 포함한 40여 개의 대학에 한국어학과가 설립되어 있다. 그 중에서 국립대학의 한국어학과는 종합형 인재 양성을 목표로 하며 보통 4년제인데 비하여 전문대학이나 사립대학은 주로 실용형 인재 양성을 목표로 하며 보통 3년제이다. 이들 대학에서 한국어를 전공으로 하는 학생 수는 약 6,000명 정도이며 해마다 약 1,500명의 졸업생을 배출한다. 2010년 이후 졸업생의 취직이 어려워져 한국어학과 학생 수도 조금 줄어드는 경향을 보이고 있다. 그 동안 급격히 발전해 왔던 산둥지역의 한국어교육은 괄목할 만한 성과를 거두었다. 그와 동시에 적지 않은 문제점들이 노출되기 시작했다. 산둥지역 한국어학과의 교육목표, 교원의 자질, 교수법의 선진화 등 여러 측면에서 많은 문제를 안고 있다. 이러한 문제점을 보완하고 한국어교육의 수준을 한 단계 더 높이기 위해서 현재 중국 산둥지역의 한국어학과에서 진행하고 있는 한국어교육에 대한 반성이 필요하다. 지금까지의 양적인 팽창에서 질적인 향상으로 전환하는 것이 시급한 과제이다. 그리고 한국어 언어중심의 교육에서 한국학 교육 및 연구 중심의 교육으로 업그레이드 되기를 기대한다. This article analysed the current status and problems of Korean language education as a foreign language in Shandong Province, China through a temporal investigation on Korean majors of universities in Shandong area. Furthermore, this article also explored the developing directions and prospects of this issue. After the official establishment of the Diplomatic Relationship between China and South Korea in 1992, the need for talented personnel who can speak Korean has been increasing and at the same time, Shandong Province can be seen as the most concentrated destination for Korean education as a foreign language in China. At present, more than 40 universities including public universities, private universities and community colleges inside Shandong area have set up Korean major. In these universities approximately 6000 students are majoring in Korean Studies and 1500 graduates will graduate from this major every year. However we can not ignore the increasingly obvious problems such as teaching objectives, qualification of lecturer and advancement of teaching method. We expect that the today"s Korean educational system in Shandong area which is concentrating solely on language itself can upgrade into studies on all aspects about Korea.
Research on Use Motivations of Mobile Payment Adopters
Zi-Yang Liu(유자양),Hao Li(이호),Yi Chen(진예) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.8
In this paper we purposes to analyze the motivation of mobile payment adopters. In this study, with unified theory of acceptance and use of technology (UTAUT) model as the basis of research, we set up a structural equation model based on gender, age, experience and voluntary, collected data in the form of a questionnaire survey and analyzed drivers that affected mobile payers. In this study, The necessity of this paper is that the group of Korean students belongs to a special group with nearly 70,000 people. The penetration rate of mobile payment in China is 77%, ranking first in the world, but after the young people came to Korea. There are many obstacles and inconveniences when using mobile payment. We have proposed special subjects for special populations. the survey data were analyzed using SPSS22.0 and AMOS22.0 statistical software and the proposed model was modified. The results show that consumers’ mobile payment is mainly motivated by social influence and performance expectancy. These results are of theoretical value and offer a new direction and implications to mobile payment developers. Besides, they also provide useful information and guidance for enterprises to aim at the market of Chinese oversea students in South Korea.