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김홍중(Hongjung Kim),김준호(Junho Kim),김철성(Cheolsung Kim),정태진(Taejin Jung) 한국통신학회 2012 韓國通信學會論文誌 Vol.37 No.1A
기존 Zhu가 제안한 준직교 기반의 차등시공간변조(Differential Space-Time Modulation, DSTM)는 복소 선부호기와 준직교 시공간블럭부호를 연접하여 차등변조기법으로 전송함으로써 수신단에서 채널 정보 추정 없이 2개의 복소 신호들에 대한 독립적인 복조, 즉 준직교 차등복조가 가능하다는 장점을 갖는다. 본 논문에서는 이와 같은 준직교 기반 Zhu-DSTM를 기반으로 복소 선부호기 대신 실수 선부호기를 사용함으로써 수신단에서 2개의 실수 신호들에 대한 독립적인 차등복조가 가능하게 하여 수신 복잡도를 더욱 줄일 수 있는 새로운 DSTM를 제안한다. 전산 실험 결과 제안된 기법은 기존의 준직교 기반 DSTM들과 거의 같거나 향상된 성능을 가짐을 확인할 수 있으며 따라서 수신 복잡도 및 수신 성능 측면에서 큰 장점을 가지게 된다. The conventional Zhu’s differential space-time modulation(DSTM) based on quasi-orthogonal design adopted a complex precoder in order to allow an independent joint detection of two complex symbols without any channel informations at a receiver. In this paper, by simply replacing the complex precoder used in Zhu’s DSTM with a real precoder, a new DSTM is presented for four transmit antennas. The real precoder enables the receiver to decode two real symbols pair separately, and thus the new DSTM has greatly reduced decoding complexity compared to the Zhu’s DSTM. By computer simulation results, the proposed scheme is shown to exhibit almost identical or improved error performance compared to the existing DSTMs.
김석호(Seokho Kim),주윤정(YunJeong Joo),성연주(YunJoo Sung),김지애(Jeeae Kim),김은지(EunJi Kim),이상규(Sangkyu Lee),김홍중(HongJung Kim) 한국문화사회학회 2017 문화와 사회 Vol.24 No.-
이 연구는 한국의 청년세대가 미래를 꿈꾸는 방식과 연관된 여러 중요한 내용들을 서베이를 활용하여 측정, 탐구하는 것을 목적으로 한다. 연구의 이론적 바탕에는 꿈-자본의 개념이 있다. 부르디외의 자본 개념을 적극적으로 활용하며, 우리는 행위자가 미래를 상상하는 힘, 희망의 감정을 품는 힘, 낙관적 태도를 견지하는 힘, 그리고 난관을 이겨가는 힘으로 구성된 총체적 능력인 꿈-자본을 형성하여 다른 자본들을 향한 동기로 활용한다는 관점을 취하고, 이를 실증적으로 탐구해 보고자 한다. 또한 청년세대가 꿈을 이루어 가는 경로와 꿈의 내용, 그리고 꿈을 경영하는 방식에 대한 탐구도 시도한다. 이를 통해 이 연구는 한국 청년의 미래 표상에 대한 경험적 탐구를 위한 기초를 마련해 보고자 한다. 꿈-자본 연구는 청년의 이질성을 분석하는데 중요한 실마리를 제공하고 있다. 기초적 분석 결과는 청년세대의 꿈이 이질화되어가고 있다는 것을 보여주고 있으며, 교육수준의 차이가 중요한 역할을 하고 있음을 시사한다. This research explores the various ways in which the young generation in South Korea today dream about their future, using the survey questionnaires specifically designed for this purpose. “Dreamcapital” serves as a theoretical framework in the research. Building on Bourdieu’s concept of capital, this study theorizes that dream-capital functions like a seed, facilitating the accumulation of other capitals. It is composed of four dimensions: imagination, hope, optimism and resilience. Furthermore, this study examines the process of dream formation and management as well as its content. This paper aims to lay the foundations for further research on the dream and values of this young population. The research on dream-capital helps examine the divergence within the young generation. The basic analysis indicates that the ways in which the young population dream about their future vary, and a significant portion of this variation is explained by the difference in the educational attainment.
Lack of Dream-Capital among Korean Youths
Seokho Kim,Hongjung Kim,Sangkyu Lee,Eunji Kim,Ohjae Gowen 서울대학교 사회발전연구소 2018 Journal of Asian Sociology Vol.47 No.3
This paper attempts to provide empirical evidence in understanding the ways that contemporary youth pursue their dreams in Korea. This paper examines the rational aspect of “dreaming” or “non-dreaming” by employing two concepts: dream-capital and penetration. In this paper, dream-capital is conceptualized as a seed that facilitates the accumulation of other capitals. It is the total capacity to dream and is composed of four dimensions: imagination, hope, optimism and resilience. Penetration is defined as the “cognitive judgment about the (un)realizability of dream.” It refers to the discrepancy that exists between judgment about the capacity, condition and qualification required to fulfill one’s dream and judgment about the extent to which one thinks she is equipped with that capacity, condition and qualification. Penetration consists of four factors: individual traits, ascribed status, individual qualifications, and national/social conditions. By analyzing the “Korean Youth Values Survey” data, this paper first examines how the general level of dream-capital is influenced by the total penetration score. And then, it also investigates the effects of four types of penetration on four dimensions of dream-capital. The results confirm that dream-capital is strongly affected by penetration. The ability to penetrate insufficient resources in pursuing dreams leads to lowering of dream-capital. Second, penetration on ascribed status and societal factors are found to be important predictors of dream-capital. These results reveal that for youth, the judgment made on their ascribed status rather than judgements made on individual trait or qualification plays a more important role in promoting dream-capital. The results imply that dreams are pursued and formed in close relation to rational cognitions among Korean youth. Korean youth are more likely to have dreams for long-term future when they believe that those dreams can be realized. Dreams are then rationalized fantasies.
Hong, Jung‐,Pyo,Yoon, Sung‐,Woon,Hwang, Taeseon,Oh, Joon‐,Suk,Hong, Seung‐,Chul,Lee, Youngkwan,Nam, Jae‐,Do,Bhuiya, Md Mainul Hossain,Kim, Kwang J. Wiley Subscription Services, Inc., A Wiley Company 2012 Polymer engineering and science Vol.52 No.11
<P><B>Abstract</B></P><P>A novel thermal‐barrier composite system was developed by incorporating fusible metal particles in the epoxy matrix system. Using the latent heat of melting, the Sn/In metal particles having melting temperature at 125°C were imbedded in the polymer matrix to suppress the thermal shock and transient temperature variation. The high‐density metal particles were successfully dispersed in the polymer matrix without sinking by incorporating inorganic particles of aluminum nitride (AlN) and boron nitride (BN), which desirably facilitated the heat dissipation to give a high thermal conductivity at around 10 W/m‐K. Under the repeated melting and cooling cycles, the spherical shape of metal particles and the latent heat of melting were retained demonstrating the reversible thermal‐barrier capability of the developed composite system. Under the constant‐heating conditions, it was validated that the temperature rise was delayed by the endothermic melting of Sn/In particles. The developed composite system could find various applications since it could minimize damages caused by the repeated thermal fatigue and/or accidental thermal shock. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers</P>