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Geometric Programming Applied to Multipoint-to-Multipoint MIMO Relay Networks
김재신,김수일,박의영 한국통신학회 2015 Journal of communications and networks Vol.17 No.3
In this paper, we consider a relaying system which employs a single relay in a wireless network with distributed sources and destinations. Here, all source, destination, and relay nodes are equipped with multiple antennas. For amplify-and-forward relay systems, we confirm the achievable sum rate through a joint multiple source precoders and a single relay filter design. To this end, we propose a new linear processing scheme in terms of maximizing the sum rate performance by applying a blockwise relaying method combined with geometric programming techniques. By allowing the global channel knowledge at the source nodes, we show that this joint design problem is formulated as a standard geometric program, which can guarantees a global optimal value under the modified sum rate criterion. Simulation results show that the proposed blockwise relaying scheme with the joint power allocation method provides substantial sum rate gain compared to the conventional schemes.
김재신,최석현,조창현 한국공공사회학회 2019 공공사회연구 Vol.9 No.4
The research aims to explore how lifestyle preference choice of married women shape labour market achievements in the Korean labour market. In this research, we try to find the relationships of lifestyle preference with career developments of married women in Korea based on Hakim's preference theory which contributes to the understanding of married women's labour market outcomes in the modern world. The results of the analysis show that work-centred women who have children under age eight are more likely to be out of the labour market. It means the age of children is the primary determinant of married women's employment regardless of their lifestyle preference type. Nevertheless, we find that home-centred lifestyle preference accentuates exit of the labour market of married women who have children under age eight. Also, the human capital theory does not show a strong relation with female employment than personal attitudes of married women. That is, preference theory can be applied in the Korean labour market on a limited scope because the age of children is a more important factor for female employment than personal attitude. By testing Hakim's preference theory in the Korean context, we can determine that lifestyle preference of women contribute to the understanding of female employment. 본 연구는 노동시장 구조적 상황 하에서 기혼 여성들의 일과 가족에 대한 선호관이 노동시장 참여에 미치는 영향을 살펴보고 향후 여성의 일-가족 양립 향상을 위한 정책 방향을 고찰한다. 분석결과, 미취학아동이 있을 경우에 일 중심 선호가 높더라도 비취업상태를 유지할 확률이 높은 것은 자녀의 생애주기단계가 노동시장 이탈에 중요한 변인임을 보여준다. 따라서 일 중심 선호 여부보다 가정 중심 선호의 높낮이에 따라 노동시장 이탈과 잔류를 결정하는 경향성이 더 높은 것으로 나타났다. Hakim의 선호이론은 우리나라 여성 노동시장 현실에서 기혼여성의 노동시장 경력 및 성과의 차이를 이해하는 유익한 모델이지만, 현실적으로 여전히 기혼여성의 가사와 육아 부담이 여성의 라이프스타일 선호를 실현시키는 데 큰 장애물로 작용하는 한계를 가지고 있다. 다만, 기혼여성이 일에 대한 가치를 중시하더라도 노동시장 내 고용의 불안정성으로 인하여 노동시장을 이탈하여 가사와 육아에 전념할 수 있기 때문에, 여성의 노동시장 참여율을 높이기 위해서 미취학아동의 육아 지원 제도의 강화와 여성의 고용안정화에도 정책적 지원이 강화되어야 한다.
권위주의 성격과 개별성, 관계성 및 심리적 적응의 관계
김재신 고려대학교 2003 虎院論集 Vol.11 No.-
This study was carried out to understand the development of authoritarian personality. Specifically, the present investigation examined the relationship among authoritarian personality, individuality-relatedness, and psychological adjustment. The results showed that the correlation of authoritarian personality and individuality was significant, but that of authoritarian personality and relatedness was not significant. Results of correlation analysis also suggested that authoritarian personality was not hightly related to peychological adjustment. The correlation of authoritarion personality and interaction anxiousness was significant, but there were no significant correlations between authoritarian personality and the other scales of psychological adjustment. However, the findings suggested that the main cause of authoritarian submission and aggression is fear and anxiety which high authoritarian people have. Implications of this study and suggestions for the future study were discussed.
김재신,유정훈,권대훈,박의영 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11
공지 데이터링크 시스템에서 재밍이나 페이딩 환경에 강인한 데이터링크 시스템을 위해 Direct sequence spread spectrum (DS-SS) 기법이 활용될 수 있다. DS-SS 전송방식이 다양한 재밍 환경에서 동일한 성능을 보이는 것은 아니다. 따라서 본 논문에서는 재밍 타입에 따른 DS-SS 의 이론적인 성능을 조사하여 대표적인 wideband noise jamming 과 narrowband noise/tone jamming 간에 3 dB 성능차이가 존재함을 보였다. 또한 제작된 DS-SS 송수신 장비를 기반으로 실측 환경을 꾸며 측정하고 성능 차이를 확인하였다. Two environments that are often encountered in air-to-ground data link systems are the jamming environment and the fading environment. In an effect of the jamming, direct sequence spread spectrum (DS-SS) technique can be utilized for a robust data link system performance. However, the performance of the DS-SS is not the same in various jamming environments. Thus, this paper investigates theoretical performance of the DS-SS according to jamming types and shows a 3 dB difference on a performance between a representative wideband noise jamming and a narrowband/tone jamming. Additionally, we measure the performance difference through a manufactured DS-SS transceiver.
김재신 대한영어영문학회 2020 영어영문학연구 Vol.46 No.2
This paper suggests that Mark Twain reframes all the situations and accidents in Pudd’nhead Wilson. By reframing, Mark Twain helps his characters view and experience events, ideas, and concepts to find more positive alternatives. In the beginning, Wilson makes an absurd joke and becomes Pudd’nhead in Dawson’s Landing, an insular city where he is supposedly the smartest man. The disgraceful name buys him some time to study about fingerprints. The study contributed to him to find the actual criminal and regain his good reputation. Mark Twain visualizes all the different perspectives of other characters while demonstrating ironical personalities so that his work keeps coherence. He adopts technically extraordinary twins, impostors, changelings, and characters with double vision and inherent and genteel values to show duality in human beings. Therefore, those ironical characters have been often considered incoherent; so was Mark Twain. However, similar to a person with the point of views of passengers and a cub pilot in his life on the Mississippi, Twain sees the world of Dawson’s Landing in his characters’ ambivalent eyes so that he can create a positive image of the world. The infamous slavery system saves Tom Driscoll’s life despite his criminal offense. Moreover, the ironies from Pudd’nhead Wilson’s Calendar at the beginning of each chapter is suitable for his cognitive reframing of the situation and contents in Pudd’nhead Wilson.