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Green Tea Consumption and Stomach Cancer Risk
Hyunseok Kang,Sun Young Rha,Kyung Won Oh,Chung Mo Nam 한국역학회 2010 Epidemiology and Health Vol.32 No.-
OBJECTIVES: Green tea has been suggested to have a chemopreventive effect against various cancers including stomach cancer. The aim of this study is to elucidate the relationship between green tea consumption and stomach cancer risk by meta-analysis. METHODS: Eighteen observational studies were identified using MEDLINE, THE COCHRANE LIBRARY, RISS, and a manual search. Summary relative risks/odds ratios (RR/ORs) for the highest versus non/lowest green tea consumption levels were calculated on the basis of fixed and random effect models. Subgroup analyses were used to examine heterogeneity across the studies. RESULTS: The combined results indicate a reduced risk of stomach cancer with intake of green tea (RR/OR=0.86, 95% CI: 0.74-1.00). Subgroup analysis with six studies that reported differences between the highest and lowest consumption levels equal to or greater than five cups/day revealed a statistically significant protective effect (RR/OR=0.68, 95% CI: 0.53-0.87). CONCLUSION: Green tea appears to play a protective role against the development of stomach cancer. The results also suggest that a higher level of green tea consumption might be needed for a clear preventive effect to appear. This conclusion, however, should be interpreted with caution because various biases can affect the results of a meta-analysis.
Interference Channel With a Causal Relay Under Strong and Very Strong Interference
Hyunseok Chang,Sae-Young Chung,Saejoon Kim IEEE 2014 IEEE transactions on information theory Vol.60 No.2
<P>In this paper, we study a two-user interference channel with a causal relay, where the relay's transmit symbol depends not only on its past received symbols, but also on its present received symbol. This is an appropriate model for studying amplify-and-forward type relaying when the bandwidth delay-spread product is much smaller than one. For the discrete memoryless interference channel with a causal relay, we derive a genie-aided outer bound. For the Gaussian interference channel with a causal relay, we define strong and very strong interference conditions and propose an outer bound for each case. We also propose an achievable scheme based on instantaneous amplify-and-forward (AF) relaying for the Gaussian interference channel with a causal relay and so it achieves capacity under some conditions. Our result extends the previous result by El Gamal, Hassanpour, and Mammen on the optimality of instantaneous AF relaying for the Gaussian relay channel with a causal relay to that of the Gaussian interference channel with a causal relay under strong and very strong interference.</P>
Non - Java 장치를 지원하기 위한 Jini 서로게이트 시스템의 설계 및 구현
최현석(Hyunseok Choi),모상덕(Sangdok Mo),정광수(Kwangsue Chung),오승준(Seoungjun Oh) 한국정보과학회 2002 정보과학회논문지 : 정보통신 Vol.29 No.6
최근 내장형 장치를 인터넷과 연결하고자 하는 요구가 늘어나고 있다. 이러한 정보기기들 간의 동적인 분산 네트워크를 구성하는 기술로서 Jini 기술이 주목을 받고 있다. 그러나, 소형 장치에 Jini 기술을 적용하여 서비스를 제공하기 위해서는 높은 하드웨어 사양을 요구하는 문제점이 지적되고 있다. 본 논문에서는 이러한 non-Java 장치를 Jini 네트워크에 접속하여 Jini 서비스를 제공하기 위한 Jini 서로게이트 시스템(Surrogate System)과 non-Java 장치간의 서로게이트 프로토콜(Surrogate Protocol)을 설계하고 자바 언어로 구현하였다. 서로게이트 시스템은 장치가 Jini 네트워크에 연결되어 Jini 서비스를 제공하기 위해 필요한 Discovery와 Join 과정을 대리해주는 역할을 수행한다. Jini 클라이언트는 서로게이트 시스템을 통해 장치가 제공하는 서비스를 이용할 수 있다. 구현한 서로게이트 시스템이 정상적으로 동작하는지 검증하기 위해 Jini 예제 프로그램을 만들어 시험하였다. 시험결과, 구현한 서로게이트 시스템을 이용해 Jini 클라이언트가 non - Java 장치의 서비스를 이용할 수 있음을 확인하였다. Recently, there has been increasingly demand for connecting a embedded device to the Internet. Jini technology is interested in automatically composing a distributed network with devices. But, there are some problems that the device needs high hardware requirements to adopt Jini technology for supporting Jini-enabled services. In this paper, we focused on design and implementation of surrogate system that supports non-Java devices in Jini networks. This system and protocol are implemented in Java language. The surrogate system delegates Discovery and Join processing to support a Jini service in connected networks. A Jini client can use service of the device through the surrogate system. We tested a Jini sample program to verify the implemented surrogate system. In the test result, we showed that the Jini client can use functionalities and operations of the non-Java device through the surrogate system.
Non - Java 디바이스를 지원하기 위한 Jini 서로게이트 시스템 설계
최현석(Hyunseok Choi),모상덕(Sangdok Mo),정광수(Kwangsue Chung),이혁준(Hyukjoon Lee) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅲ
내장형 디바이스를 인터넷과 연결하고자 하는 요구가 늘어나고 있다. 이러한 정보기기들을 동적으로 상호 작용하게 하는 기술로서 지니(Jini)가 최근 주목을 받고 있다. 그러나 내장형 디바이스에서 지니 서비스를 제공하기 위해 요구되는 높은 하드웨어 사양이 문제점으로 지적되고 있다. 본 논문에서는 이러한 non-Java 디바이스를 지니 네트워크에 접속하여 지니 서비스를 제공할 수 있도록 서로게이트 시스템(Surrogate System)과 non-Java 디바이스간의 프로토콜을 설계하였다.
Carbon-free Mn-doped LiFePO<sub>4</sub> cathode for highly transparent thin-film batteries
Lee, HyunSeok,Kim, Sangtae,Parmar, Narendra Singh,Song, Jong-Han,Chung, Kyung-yoon,Kim, Kwang-Bum,Choi, Ji-Won Elsevier Sequoia 2019 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>The search for transparent battery cathodes primarily focuses on patterned electrodes with feature sizes below the optical absorption limit. This significantly limits the electrode capacity, as a large electrode area remains unused to maintain transparency. Herein, we report transparent olivine LiFe<SUB>0.77</SUB>Mn<SUB>0.23</SUB>PO<SUB>4</SUB> thin-film electrodes discovered through high-throughput continuous-composition-spread sputtering. After investigating six different Mn doping ratios, we found the optimal Mn-doped olivine composition with an enhanced discharge capacity of 45.7 μA h/cm<SUP>2</SUP>∙μm without using excessive nanosized features or carbon coating. The thin-film electrode exhibits a clear redox activity for both Fe<SUP>3+/2+</SUP> and Mn<SUP>3+/2+</SUP>, resulting in an enhanced average voltage over LiFePO<SUB>4</SUB> composition. A 250-nm-thick film exhibits an optical transmittance of over 80% in the visible region. The results in this study demonstrates that transparent cathode thin films can be developed based on phospho-olivines via doping strategies with high-throughput continuous-composition-spread sputtering methods.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Exploration of carbon-free transparent LiFe<SUB>1-<I>x</I> </SUB>Mn<SUB> <I>x</I> </SUB>PO<SUB>4</SUB> thin films by CCS. </LI> <LI> The capacity of carbon-free LiFe<SUB>0.77</SUB>Mn<SUB>0.23</SUB>PO<SUB>4</SUB> thin films is 45.7 μA h/cm<SUP>2</SUP>∙μm. </LI> <LI> Transmittance of Carbon-free LiFe<SUB>0.77</SUB>Mn<SUB>0.23</SUB>PO<SUB>4</SUB> thin film exhibits 82%. </LI> <LI> Carbon-free LiFe<SUB>0.77</SUB>Mn<SUB>0.23</SUB>PO<SUB>4</SUB> is suitable for transparent thin film batteries. </LI> </UL> </P>