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RISS 인기검색어
- 검색키워드
- 저자 : Boettcher, Shannon W. (검색결과 4 건)
- 무료
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THE PARADOX OF THE NORTH KOREAN FINANCIAL POSITION
Jacques G Boettcher People&Global Business Association 2004 Global Business and Finance Review Vol.9 No.1
The Democratic People's Republic of Korea (DPRK) emerges in 2003 in a most unenviable position. The North Korean Constitution steadfastly upholds the Socialist ideology, but as North Korea moves faster and closer to the implementation of this doctrine, it becomes increasingly dependent upon foreign capital investment and technology. This has forced North Korea to increasingly break from the Marxist-Leninist constraint and to develop and modify some thirty-jive new laws to calm the wary foreign investor. Now the Foreign Trade Act of February 2001, and the Enforcement Decree of the Foreign Investment Protection Act of December 2001, widens the cracks in the heretofore-concrete socialist Constitutional faith.
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온라인과 오프라인 소셜 네트워크 및 위치 정보를 활용한 모바일 사용자들의 여행 경험 증대
손희석(Heesuk Son),Alexander Boettcher,김병오(BeoungO Kim),이동만(Dongman Lee) 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1
여행은 전 세계적으로 많은 사람들이 즐기고 장려하는 여가 활동으로 여행자의 수는 앞으로도 계속 증가할 것으로 예측되고 있다. 퍼베이시브 컴퓨팅 시대의 도래는 이러한 여행정보를 검색함에 있어서 웹 블로그와 각종 사용자 생성 콘텐츠, 모바일 콘텐츠 등을 활용가능하게 해주었지만, 콘텐츠의 무분별적인 양적 범람과 그에 대한 신뢰 부족은 사용자 경험을 만족시켜 주는 데에 있어 한계를 내포하고 있다. 이에 각종 콘텐츠 및 소셜 미디어를 활용하여 여행 경험을 만족시켜주는 시스템에 대한 다양한 연구가 진행되고 있지만 이 또한 신뢰 관계를 맺고 있는 대상과 여행 경험을 직접 공유하는 것을 지원해 주지 못해 마찬가지로 사용자 경험을 만족시켜주는 데에 있어 한계가 있다. 본 논문은 이러한 문제점들을 극복하기 위해 사용자의 여행 경험 축적 및 선호도 분석, 그리고 이를 통한 다른 사용자들과의 직접적인 여행정보 공유를 지원하는 모바일 에이전트 Travobble 을 소개하고 사용자 경험의 만족도를 알아보기 위한 사용자 테스트 결과를 보여준다.
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Chun, Sang-Eun,Yoo, Seung Joon,Boettcher, Shannon W. The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.1
We describe a redox-enhanced electric double-layer capacitor (EDLC) that turns the electrolyte in a conventional EDLC into an integral, active component for charge storage-charge is stored both through faradaic reactions with soluble redox-active molecules in the electrolyte, and through the double-layer capacitance in a porous carbon electrode. The mixed-redox electrolyte, composed of vanadium and iodides, was employed to achieve high power density. The electrochemical reaction in a supercapacitor with vanadium and iodide was studied to estimate the charge capacity and energy density of the redox supercapacitor. A redox supercapacitor with a mixed electrolyte composed of 0.75 M NaI and 0.5 M $VOSO_4$ was fabricated and studied. When charged to a potential of 1 V, faradaic charging processes were observed, in addition to the capacitive processes that increased the energy storage capabilities of the supercapacitor. The redox supercapacitor achieved a specific capacity of 13.44 mAh/g and an energy density of 3.81 Wh/kg in a simple Swagelok cell. A control EDLC with 1 M $H_2SO_4$ yielded 7.43 mAh/g and 2.85 Wh/kg. However, the relatively fast self-discharge in the redox-EDLC may be due to the shuttling of the redox couple between the polarized carbon electrodes.
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Evanko, Brian,Yoo, Seung Joon,Lipton, Jason,Chun, Sang-Eun,Moskovits, Martin,Ji, Xiulei,Boettcher, Shannon W.,Stucky, Galen D. The Royal Society of Chemistry 2018 Energy & environmental science Vol.11 No.10
<P>A critical bottleneck in the development of aqueous electrochemical energy storage systems is the lack of viable complete cell designs. We report a metal-free, bipolar pouch cell designed with carbon black/polyethylene composite film (CBPE) current collectors as a practical cell architecture. The light-weight, corrosion-resistant CBPE provides stable operation in a variety of aqueous electrolytes over a ∼2.5 V potential range. Because CBPE is heat-sealable, it serves simultaneously as both the pouch cell packaging and seal in addition to its use as a current collector. Although this non-metallic composite has a low electrical conductivity relative to metal foils, current travels only a short distance in the through-plane direction of the current collector in the bipolar cell configuration. This shorter path length lowers the effective electrical resistance, making the design suitable for high-power applications. We test the cell architecture using an aqueous ZnBr2 battery chemistry and incorporate tetrabutylammonium cations to improve the intrinsic low Coulombic efficiency and fast self-discharge of non-flow ZnBr2 cells. These devices demonstrate a cell-level energy density of 50 W h L<SUP>−1</SUP> at a 10C rate (0.5 kW L<SUP>−1</SUP>), with less than 1% capacity loss over 500 cycles. A large-area (>6 cm<SUP>2</SUP>) 4-cell stack is built to illustrate that the pouch cells are scalable to practical dimensions and stackable without sacrificing performance. The device operates in the range of 6-7 V and has an internal self-balancing mechanism that prevents any individual cell in the stack from overcharging. The results thus demonstrate both a conceptually new cell architecture that is broadly applicable to many aqueous electrolyte chemistries and a specific high-performance example thereof.</P>
KCI
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