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Sum Rate Maximization of an MIMO Two-Way Relay System Using MSE Duality
Ayoung Heo,Won-Chul Choi,Jung-Hyun Park,Dong-Jo Park IEEE 2015 IEEE communications letters Vol.19 No.5
<P>In this letter, we propose a novel joint beamforming scheme using mean-square error (MSE) duality to maximize the sum rate of a multiple-input multiple-output (MIMO) two-way relay system. It is difficult to solve the sum rate maximization problem directly due to its non-convexity. To manage this difficulty, the optimization problem is reformulated as a problem that minimizes the product of the minimum mean-square errors. Then, we show that the per stream MSE duality holds in a two-way relay system under cross power constraints. Based on the per stream MSE duality, an alternate algorithm is proposed to jointly optimize the linear transceivers. The simulation results demonstrate that the proposed scheme outperforms the existing linear schemes in view of the sum rate maximization.</P>
조아영(Ayoung Cho),이현우(Hyunwoo Lee),우진철(Jincheol Woo),조영호(Youngho Jo),황민철(Mincheol Whang) 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2
인간의 생체 리듬은 정서와 행동에 영향을 미친다. 또한 인간의 인지 프로세스는 환경-몸-뇌의 상호작용을 통해 이루어진다. 본 연구에서는 라이프로깅을 통해 개인의 일상 생활을 추적하여 정서를 대표하는 심장반응과 행동을 대표하는 생활패턴 사이의 인과관계를 파악하고자 한다. 심장반응은 스마트폰의 가속도 센서를 기반으로 심탄도를 통해 측정하였고, 생활패턴은 GPS 를 기반으로 분석되었다. 실험은 피험자 4 명을 대상으로 하루 동안의 라이프로그 데이터를 수집하였으며 경로분석을 실시하였다. 그 결과 개인마다 심장반응과 생활패턴의 인과관계를 도출하였다. 본 연구는 개인의 생체 리듬의 내적 요인과 외적 요인의 관계성을 파악하는데 기초 연구로써 활용될 수 있을 것으로 기대된다.
Evaluation of jet performance in drop-on-demand (DOD) inkjet printing
Byoung Wook Jo,Ayoung Lee,Seung Jong Lee,이승종 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2
Inkjet printing has been widely used in many applications and has been studied for many years. However, there are not many systematic researches on the mechanism of jet formation, nor is there any reliable platform that enables us to evaluate jet performance. In this study, an approach to practically evaluate the jet stability of the dropon-demand (DOD) inkjet printing has been proposed, based on which the transient behavior of the DOD drop formation has been studied experimentally for Newtonian liquids with a range of different viscosities (1.0-11 cp) but of a comparable surface tension. For more viscous liquids, the rate of the jet retraction after a pinch-off from the nozzle was found to increase as the thread motion became more sharp and conical as a result of the shape effect. The break-up time of the jet also increased because the rate of capillary wave propagation was lower for more viscous liquids. The jet stability graph, which can be drawn in terms of jet retraction and break-up time, was employed to characterize the jetting stability, and the degree of satellite drop generation was quantitatively evaluated by two critical jet speeds. The effect of an electric pulse imposed on a piezoelectric plate inside the printhead was also studied. The single-peak electric pulse was used in this experiment for simple analysis, and the jet speed variation was measured under different operating conditions. Both the optimal dwell time and the maximum stable jetting frequency were affected by viscosity and they were explained in terms of the propagation theory.
라이프로깅 데이터를 이용한 소셜 네트워크 그룹 생성 시스템
조영호(Youngho Jo),우진철(Jincheol Woo),이현우(Hyunwoo Lee),조아영(Ayoung Cho),황민철(Mincheol Whang) 한국HCI학회 2017 한국HCI학회 논문지 Vol.12 No.2
스마트폰과 웨어러블 기기의 발달로 다양한 라이프로깅 서비스와 클라우드 서비스가 제공되고 있다. 소셜 네트워크 서비스는 인터넷상에서 개인의 일상을 공유해 친구들에게 근황을 알리고 새로운 인간관계를 형성하도록 한다. 라이프로깅 관련 연구들이 활발하게 이뤄지고 있지만 소셜 네트워크 서비스 시대의 라이프로깅은 단순한 기억의 확장을 넘어 사회적 관계를 제시해야 한다. 또한 사회적 이슈인 개인정보 보호를 위해 익명성이 보장되어야 한다. 본 연구는 일상생활에서 얻어지는 라이프로깅 데이터를 이용해 소셜 네트워크 그룹을 생성하는 시스템을 제안한다. 소셜 네트워크 그룹은 비슷한 감성 성향의 사람들을 범주화함으로써 사회적 관계를 제공한다. 이때, 익명성 보장을 위해 타인을 식별할 수 없도록 한다. 소셜 그룹의 대표 감성과 비슷한 소셜 그룹들을 범주화해서 확장된 소셜 네트워크 그룹을 만들 수 있다. 소셜 그룹간의 네트워크로 확장되면 대표 감성과 행동 양식을 분석해 대중의 패턴과 트렌드를 추론할 수 있는 기초데이터를 제공할 수 있다. Various life-logging based on cloud service have developed social network according to the advanced technology of smartphone and wearable device. Daily digital life on social networks has been shared information and emotion and developed new social relationships. Recent life-logging has required social relationships beyond extension of personal memory and anonymity for privacy protection. This study is to determine social network group by using life-logging data obtained in daily lives and to categorize emotion behavior with anonymity guarantee. Social network group was defined by grouping similar representative emotional behavior. The public"s patterns and trends was able to be inferred by analyzing representative emotion and behavior of the social groups network.
Ga-Yeon Go,Ayoung Jo,Dong-Wan Seo,Woo-Young Kim,Yong Kee Kim,Eui-Young So,Qian Chen,Jong-Sun Kang,Gyu-Un Bae,Sang-Jin Lee 고려인삼학회 2020 Journal of Ginseng Research Vol.44 No.3
Background: As a process of aging, skeletal muscle mass and function gradually decrease. It is reported that ginsenoside Rb1 and Rb2 play a role as AMP-activated protein kinase activator, resulting in regulating glucose homeostasis, and Rb1 reduces oxidative stress in aged skeletal muscles through activating the phosphatidylinositol 3-kinase/Akt/Nrf2 pathway. We examined the effects of Rb1 and Rb2 on differentiation of the muscle stem cells and myotube formation. Methods: C2C12 myoblasts treated with Rb1 and/or Rb2 were differentiated and induced to myotube formation, followed by immunoblotting for myogenic marker proteins, such as myosin heavy chain, MyoD, and myogenin, or immunostaining for myosin heavy chain or immunoprecipitation analysis for heterodimerization of MyoD/E-proteins. Results: Rb1 and Rb2 enhanced myoblast differentiation through accelerating MyoD/ E-protein heterodimerization and increased myotube hypertrophy, accompanied by activation of Akt/ mammalian target of rapamycin signaling. In addition, Rb1 and Rb2 induced the MyoD-mediated transdifferentiation of the rhabdomyosarcoma cells into myoblasts. Furthermore, co-treatment with Rb1 and Rb2 had synergistically enhanced myoblast differentiation through Akt activation. Conclusion: Rb1 and Rb2 upregulate myotube growth and myogenic differentiation through activating Akt/mammalian target of rapamycin signaling and inducing myogenic conversion of fibroblasts. Thus, our first finding indicates that Rb1 and Rb2 have strong potential as a helpful remedy to prevent and treat muscle atrophy, such as age-related muscular dystrophy.
Go, Ga-Yeon,Jo, Ayoung,Seo, Dong-Wan,Kim, Woo-Young,Kim, Yong Kee,So, Eui-Young,Chen, Qian,Kang, Jong-Sun,Bae, Gyu-Un,Lee, Sang-Jin The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.3
Background: As a process of aging, skeletal muscle mass and function gradually decrease. It is reported that ginsenoside Rb1 and Rb2 play a role as AMP-activated protein kinase activator, resulting in regulating glucose homeostasis, and Rb1 reduces oxidative stress in aged skeletal muscles through activating the phosphatidylinositol 3-kinase/Akt/Nrf2 pathway. We examined the effects of Rb1 and Rb2 on differentiation of the muscle stem cells and myotube formation. Methods: C2C12 myoblasts treated with Rb1 and/or Rb2 were differentiated and induced to myotube formation, followed by immunoblotting for myogenic marker proteins, such as myosin heavy chain, MyoD, and myogenin, or immunostaining for myosin heavy chain or immunoprecipitation analysis for heterodimerization of MyoD/E-proteins. Results: Rb1 and Rb2 enhanced myoblast differentiation through accelerating MyoD/E-protein heterodimerization and increased myotube hypertrophy, accompanied by activation of Akt/mammalian target of rapamycin signaling. In addition, Rb1 and Rb2 induced the MyoD-mediated transdifferentiation of the rhabdomyosarcoma cells into myoblasts. Furthermore, co-treatment with Rb1 and Rb2 had synergistically enhanced myoblast differentiation through Akt activation. Conclusion: Rb1 and Rb2 upregulate myotube growth and myogenic differentiation through activating Akt/mammalian target of rapamycin signaling and inducing myogenic conversion of fibroblasts. Thus, our first finding indicates that Rb1 and Rb2 have strong potential as a helpful remedy to prevent and treat muscle atrophy, such as age-related muscular dystrophy.