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Helical Silicon/Silicon Oxide Core–Shell Anodes Grown onto the Surface of Bulk Silicon
Yoo, Hana,Lee, Jung-In,Kim, Hyunjung,Lee, Jung-Pil,Cho, Jaephil,Park, Soojin American Chemical Society 2011 NANO LETTERS Vol.11 No.10
<P>We demonstrate a simple route for preparing Si/SiO<SUB><I>x</I></SUB> urchin-like structures in which Si/SiO<SUB><I>x</I></SUB> core–shell nanocoils protruded out from the surface of bulk Si, via high-temperature annealing of Pt-decorated Si powders. The carbon-coated urchin-like anodes with micro- and nanostructured composite exhibit a significantly improved electrochemical performance with a high specific capacity of 1600 mAh/g and a superior cycling performance of 70 cycles at a rate of 0.2 C due to the nanocoil conformation and SiO<SUB><I>x</I></SUB> buffer layer. More importantly, the composite results in a significantly enhanced the volumetric capacity with ∼3780 mAh/cc, compared to bulk Si (∼2720 mAh/cc) after fully lithiation to 0 V.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-10/nl202417c/production/images/medium/nl-2011-02417c_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl202417c'>ACS Electronic Supporting Info</A></P>
Yoo, Hana,Choi, Jungseok,Wang, Gunuk,Kim, Tae-Wook,Noh, Jaegeun,Lee, Takhee American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.12
<P>We fabricated a large number of microscale via-hole structure molecular devices (2240 devices) using octane-Se [CH3(CH2)7Se] self assembled monolayers (SAMs) and compared their charge transport properties with those of octane-S [CH3(CH2)7S] SAMs molecular devices in terms of current density, resistance, and tunneling decay coefficient. The device yield of the 'working' octane-Se molecular devices was found to be approximately 1.7% (38/2240), which was similar to the yield of approximately 1.1% (50/4480) for octane-S devices. Our statistical analysis revealed that for octane-Se devices the tunneling current was slightly smaller and the low-bias resistance and decay coefficient were slightly larger than those for octane-S devices. The standard deviations of these transport parameters of octane-Se devices were found to be broader than those for octane-S devices due to irregularity of the binding sites of octane-Se on Au electrode surface.</P>
Yoo, Hana,Park, Soojin IOP Pub 2010 Nanotechnology Vol.21 No.24
<P>We demonstrate the fabrication of highly ordered silicon oxide dotted arrays prepared from polydimethylsiloxane (PDMS) filled nanoporous block copolymer (BCP) films and the preparation of nanoporous, flexible Teflon or polyimide films. Polystyrene-<I>block</I>-poly(2-vinylpyridine) (PS-<I>b</I>-P2VP) films were annealed in toluene vapor to enhance the lateral order of micellar arrays and were subsequently immersed in alcohol to produce nano-sized pores, which can be used as templates for filling a thin layer of PDMS. When a thin layer of PDMS was spin-coated onto nanoporous BCP films and thermally annealed at a certain temperature, the PDMS was drawn into the pores by capillary action. PDMS filled BCP templates were exposed to oxygen plasma environments in order to fabricate silicon oxide dotted arrays. By addition of PS homopolymer to PS-<I>b</I>-P2VP copolymer, the separation distances of micellar arrays were tuned. As-prepared silicon oxide dotted arrays were used as a hard master for fabricating nanoporous Teflon or polyimide films by spin-coating polymer precursor solutions onto silicon patterns and peeling off. This simple process enables us to fabricate highly ordered nanoporous BCP templates, silicon oxide dots, and flexible nanoporous polymer patterns with feature size of sub-20 nm over 5 cm × 5 cm. </P>
Volumetric Capacitance of In-Plane- and Out-of-Plane-Structured Multilayer Graphene Supercapacitors
Yoo, Jungjoon,Kim, Yongil,Lee, Chan-Woo,Yoon, Hana,Yoo, Seunghwan,Jeong, Hakgeun The Korean Electrochemical Society 2017 Journal of electrochemical science and technology Vol.8 No.3
A graphene electrode with a novel in-plane structure is proposed and successfully adopted for use in supercapacitor applications. The in-plane structure allows electrolyte ions to interact with all the graphene layers in the electrode, thereby maximizing the utilization of the electrochemical surface area. This novel structure contrasts with the conventional out-of-plane stacked structure of such supercapacitors. We herein compare the volumetric capacitances of in-plane- and out-of-plane-structured devices with reduced multi-layer graphene oxide films as electrodes. The in-plane-structured device exhibits a capacitance 2.5 times higher (i.e., $327F\;cm^{-3}$) than that of the out-of-plane-structured device, in addition to an energy density of $11.4mWh\;cm^{-3}$, which is higher than that of lithium-ion thin-film batteries and is the highest among in-plane-structured ultra-small graphene-based supercapacitors reported to date. Therefore, this study demonstrates the potential of in-plane-structured supercapacitors with high volumetric performances as ultra-small energy storage devices.
아두이노와 블루투스 기반의 펌프모터 제어를 통한 음료 혼합 시스템의 개발
오하나 ( Hana Oh ),유민정 ( Minjung Yoo ),유진희 ( Jinhee Yoo ),박상수 ( Sangsoo Park ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.2
본 논문에서는 아두이노와 블루투스를 이용하여 워터펌프모터를 제어하고 음료가 섞이는 칵테 일 머신을 개발하였다. 칵테일 머신의 주요 기능은 1) 안드로이드 기반 OS 와 아두이노에 연결된 블루투스 모듈 간의 통신을 통해 음료를 주문하고, 2) 각 워터펌프 모터들의 수동 캘리브레이션 작업을 통해 정밀한 음료량을 제어하며, 3) 레시피에 선택된 음료들 간의 배합을 통해 칵테일을 주조하는 것이다. 이를 위해 펌프모터 제어를 통해 음료 혼합 시스템을 개발하기 위해 개별 모터와 사용 되는 액체의 점도에 따른 유량의 차이를 실험을 통해 획득함으로써 칵테일을 구성하는 주요 요소인 배합비율을 맞추는 기능을 구현하였다.
컨벤션 광고속성평가에 따른 세분집단별 컨벤션 광고 만족도 및 참가행동의도 연구
유현경(Yoo, Hana Hyun Kyung),김은진(Kim, Eun Jin),윤유식(Yoon, Yoo Shik) 한국전시산업융합연구원 2015 한국과학예술융합학회 Vol.21 No.-
본 논문의 연구목적은 융복합 컨벤션 산업의 광고속성에 대한 응답자들의 태도를 중심으로 군집분석을 실시하여 각 군집별 컨벤션광고 만족도 및 컨벤션 참가행동에 대한 차이를 분석하고자 실증분석을 실시하는데 있다. 본 논문의 연구방법 및 범위 연구내용은 다음과 같다. 선행연구를 통하여 컨벤션 광고 속성을 도출하고 이에 대한 컨벤션 참가자들의 태도를 컨벤션광고 개별성, 상호작용성, 정보성의 요인을 도출하여 이를 기준으로 동일한 집단을 세분화하였다. 도출된 요인을 군집분석을 실시한 결과, 컨벤션광고 속성에 따라 부정적, 중도적, 긍정적 집단으로 세분화되었고, 각 군집별 만족도 및 참가행동에 대한 차이를 분석하였다. 연구결과는 다음과 같다. 컨벤션 광고에 대하여 긍정적인 집단은 만족도 및 충성도가 높게 나타난 반면, 부정적인 집단은 만족도가 낮게 나타난 것을 보면, 컨벤션 광고의 속성에 대한 중요성을 시사할 수 있다. 따라서 컨벤션 광고에 대하여 가능한 참가자들의 개별적인 요구사항들에 맞추어 다양한 광고가 필요하며, 필요한 사항을 충분히 제시될 필요가 있다고 할 수 있다. 컨벤션 광고에 대한 상호작용이 매우 중요한 사항임으로 컨벤션 광고를 접하는 사람들에 대한 상호소통을 할 수 있도록 기획해야 할 것이다. The purpose of this study was to investigate if there are any differences of convention advertising and participation behavior based on the segmented groups of convention advertising attributes. The research methods and contents of this study are as follows. From the literature, the measurement of convention advertising attributes, satisfaction, and participation behavior had been developed and utilized to collect the data. The results of factor analysis showed three underlying dimensions of convention advertising attributes. Cluster analysis showed that there were three different segmented groups such as negative, mediative, and positive groups of convention advertising attributes. Lastly, MANOVA showed that there were differences of convention advertising and participation behavior among the segmented groups. More theoretical and practical implication are discussed in the conclusion.
영상 특성을 고려한 스케일러블 비디오 기반 품질 메트릭
유하나(Hana Yoo),김천석(Cheon Seog Kim),이호준(Ho Jun Lee),진성호(Sung Ho Jin),노용만(Yong Man Roa) 한국방송·미디어공학회 2008 방송공학회논문지 Vol.13 No.2
In this paper, we proposed the quality metric based on SVC and the subjective quality. The proposed quality metric is for a general purpose. It means we can use it for any video sequences regardless of its temporal and spatial characteristics. The Quality of Service(QoS) is one of the important issues in heterogeneous environment which has diverse restrictions such as limited network bandwidth and limited display resolution. Scalable Video Coding(SVC) is the efficient video coding skill in heterogeneous environment. Because SVC can be adapted to various quality bitstreams using three scalabilities(spatial, temporal, and SNR) from one bitstream which has full scalability. To maximize the QoS in this environment, we should consider the subjective quality which is the viewer response. And also we should consider temporal and spatial characteristics of video sequence because the subjective quality is affected by temporal and spatial characteristics of video sequence. To verify the efficiency of the proposed method, we perform subjective assessments. The experimental results show that the proposed method has high correlation with subjective quality. The proposed method can be a decision tool of SVC birstream extraction.