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유동층 반응기에서 카본블랙 촉매를 이용한 프로판의 촉매 분해에 의한 수소생산 연구
남우석(Nam, Woo-Seok),정재욱(Jung, Jae-Uk),윤기준(Yoon, Ki-June),이동현(Lee, Dong-Hyun),한귀영(Han, Gui-Young) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
A fluidized bed reactor made of quartz with 0.055m I.D. and 1.0m in height was employed for the thermocatalytic decomposition of propane to produce CO₂-free hydrogen. The fluidized bed was proposed for the continuous withdraw of product carbons from the reactor The propane decomposition rate used carbon black DCC-N330, Hi-900L as a catalyst. The propane decomposition reaction was carried out at the temperature range of 600-800?C, propane gas velocity of 1.0U_{mf} and the operating pressure of 1.0 atm. Effect of operating parameters such as reaction temperature on the reaction rates was investigated. Resulting production in our experiment were not only hydrogen but also several by products such as methane, ethylene, ethane, and propylene.
가역적 산화-환원 매개체를 이용한 Pt- and Ir-TiO₂ 박막에서 물분해에 의한 수소제조
남우석(Nam Wooseok),한귀영(Han Gui Young) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
Photocatalytic decomposition of water in alkaline solution was investigated using Pt- or Ir-TiO₂ as photocatalyst and iodine ion as a redox mediator. Hydrogen evolved over Pt-loaded semiconductor photocatalysts and oyxgen was evolved by Ir-TiO₂ thin film. We found that there are existed the optimum pH condition and redox mediator concentration on water splitting. Photocatalytic layer was prepared by sol-gel method on the bottom of the reactor. The results showed that water splitting depends on the concentration of alkaline solution, redox mediator concentration and amounts of Ir loading.
남우석(Woo seok Nam),민대환(Dai hwan Min) 한국IT서비스학회 2014 한국IT서비스학회지 Vol.13 No.4
Since the global financial crisis, funding for startups or ventures has been diminished seriously. In this situation, crowd-funding has attracted worldwide attention as a viable means to financing startups/ventures. After reviewing existing laws in other countries, this study investigated the current status of crowd-funding legalization in Korea and surveyed requirements from three groups of participants to crowd-funding. Investors already recognized the high risk of crowd-funding into startups and asked for the protection of their investment. But, their priorities were on the enlargement of tax benefits and the establishment of a trading market for selling their equity. In addition, investors wanted to shorten the compulsory holding period. Issuers as fund raisers hoped fast legalization, convenient process of crowd-funding, and expansion of government support. Crowd-funding platform operators requested policies for establishing paths to become new growth companies from startups, tax benefits, and the setup of separate fund for startups. Currently, the National Assembly in Korea is holding the discussion on the submitted law. For desirable outcomes to all participants, it would be better to proceed in the following sequence. First, legalize the crowd-funding with clauses protecting investors; Second, encourage investment through tax benefits; Third, develop communities among participants for reducing information asymmetry; And fourth, establish diverse trading markets for selling equities of startups.
남우석(Woo Seok Nam),민대환(Daihwan Min) 한국IT서비스학회 2014 한국IT서비스학회 학술대회 논문집 Vol.2014 No.춘계
글로벌 금융위기로 인하여 신생·벤처기업 등에 민간부분의 자금이 크게 위축되고 있는 상황에서 국가경제 전체의 중장기적 관점에서 볼 때 신생·벤처기업등의 생태계의 부실은 곧 미래 성장 동력과 일자리 창출의 부실화를 초래하고 있다. 이런 상황에서 신생·벤처기업의 자금조달의 수단으로 크라우드펀딩이 전 세계적으로 관심을 받고 있으며 2012년 4월 오바마 미국대통령은 신생기업의 창업 및 초기단계에서의 자금조달을 돕기 위하여“창업지원법(Jumpstart Our Bunsiness Startup Act : JOBS Act)”을 공포하였는데, 이 창업지원법의 주요내용 중에 크라우드 펀딩(Crowdfunding)의 허용이 들어 있다. 우리나라 또한 2012년 5월 “기업투자 활성화 방안“에서 투자방식 크라우드 펀딩의 도입이 포함되었으며 이는 현재 박근혜정부에서 창조경제를 추진하기 위한 자금조달의 한 방법으로 제시되고 있다. 이에 해외 입법 현황과 미국의 JOBS법의 세부 내용을 분석하여 국내 크라우드펀딩(Crowdfunding)의 법제화의 진행과정에서 시장의 자율적인 방향으로의 입법적 제언을 통하여 신생·벤처기업의 자금조달의 활성화와 성장동력을 확보하기 위한 방향을 모색하고자 한다. 이를 통해 많은 일자리가 창출될 수 있도록 크라우드펀딩(Crowdfunding)의 발전 방향과 투자자 보호를 위한 입법이 필요하며 신생·벤처기업이 성장할 수 있는 방향으로 추진되어야 한다.