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다양한 운전조건에 따른 회분식 반응기 내에서 고형연료의 열분해 및 가스화 특성
이신구(Shinku Lee),김경태(Kyong-Tae Kim),고대권(Daekwun Ko),이동현(Dong-Hyeon Lee),이재율(Jaeyool Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Thermal pyrolysis and steam gasification of two different refuse plastic fuels(RPFs), differing slightly in composition were carried out under various operating conditions in a batch reactor. The proximate and ultimate analyses reveal that carbon and hydrogen are the major components in RPFs. H₂ and C<SUB>x</SUB>H<SUB>y</SUB> were found to be the major products as the result of the thermal pyrolysis and steam gasification. The yield of hydrocarbon decreased, producing more hydrogen as the gasification temperature increased from 885 ℃ to 1040℃. However, steam addition had little effect on the products composition of RPFs. On the other hand, the composition of RPF played an important role in distribution of products gas. The RPF with more C and H content was found to produoe more amount of H2 and C<SUB>x</SUB>H<SUB>y</SUB>. The composition of hydrocarbons was analyzed by gas chromatography. As a result, it was observed that higher hydrocarbons were thermally cracked to lower hydrocarbons as the increase of gasification temperature.
메신저 환경에서 보안강화를 위한 파일관리 시스템의 설계 및 구현
이신구(Sinku Lee),신정훈(Junghoon Shin),이상준(Sangjun Lee) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1C
네트워크가 발전함에 따라 네트워크를 통해 전송되는 데이터 보안과 지적 재산권에 대한 문제점 또한 증가하게 되었다. 특히 기존의 사내통신 및 데이터 전송을 목적으로 사용되는 메신저의 경우 데이터 전송시 보안에 취약할 뿐 아니라 지적 재산권에 대한 보호도 제대로 하지 못하고 있다. 본 논문에서는 이러한 메신저 환경에서의 데이터 보안과 지적 재산권에 관련된 보안적 위험 요소들을 유형별로 분류하고 분석하였다. 분석 결과를 토대로 메신저 환경에서의 보안 문제점을 해결하기 위한 몇 가지 방법들을 제안한다. 본 논문은 제안된 방법들을 이용하여 안정적인 보안을 제공하기 위해 DES, RSA와 같은 암호화 알고리즘과 DRM을 적용한 파일전송 시스템을 설계 및 구현하였다.
이신구 ( Lee Shin-koo ) 한국헤세학회 2011 헤세연구 Vol. No.
Im Mittelalter formulierte Boethius die Gliederung der Musik in musica mundana, musica humana, musica instrumentalis. Im Musikerroman Gertrud von Hermann Hesse begegnet uns diese Dreiheit der Musik wieder als die im Menschen tönende musica humana, als die von ihm erzeugte musica instrumentalis, und dann als die kosmische, alles umfassende musica mundana. Hesse ist ein musizierender Dichter. Die Musik gehört wie selbstverständlich zu seinem Atem und er versucht sie im eigenen Schaffen immer wieder von neuem zu beschwören. Er musiziert Gertrud mit der Sprache als ein Trio für zwei Geigen und ein Cello. Die eine Geige steht für den Musiker Kuhn, die andere für seine Freundin Gertrud. Diese hat die innere Heiterkeit, die zur Mozartwelt gehört. Ein Cello repräsentiert Kuhns Freund Heinrich Muoth, der auf Wagner schwört. Muoth ist Gertruds Gegenpol, ein böser Zauberer gleich Wagner. Am Ende des Zaubers stehen der Tod und der Verfall. In diesem Sinne lässt sich das Streichtrio in Es-dur als die Geschichte ihrer Freundschaft verstehen. So versuche ich Gertrud als ein Streichtrio, das aus drei Sätzen aufgebaut ist, zu analysieren. Der erste Satz andante ist ein goldener Weg zu Gertrud hin. Der zweite Satz, die Beichte Kuhns, kann als Bekenntnis seiner Sehnsucht und seines Unbefriedigtseins gedeutet werden, während der dritte Satz für Erlösung und Erfüllung steht. Erst im letzten gelingt es Kuhn, die musica humana und die musica mundana mit der musica instrumentalis zu vereinen. Dadurch erreicht er die unio mystica. Auf musikalischem Gebiet waren Hermann Hesse und Thomas Mann grundverschiedene Naturen. Hesse hat sich zu Mozart gewandt, Thomas Mann dagegen zu Wagner. Trotz ihres verschiedenen Wesens ist es zu einer festen Freundschaft zwischen diesen beiden, wie der zwischen Kuhn und Muoth, gekommen.
이신구(Shinku Lee),강인용(Inyong Kang) 한국열환경공학회 2020 한국열환경공학회 학술대회지 Vol.2020 No.춘계
Roadmap to revitalize the hydrogen economy includes a variety of plans for establishing industrial ecology which leads hydrogen society with two principal axes of hydrogen vehicles and fuel cells. Based on the government strategy, current technical status of fuel cells for household, buildings, and power generation is shown with representative products of domestic and foreign industries. Beyond cell stack manufacture, essential components of fuel cell system have been developed with the target of localization. On the other hand, fuel cell system needs to secure long lifetime and high electrical efficiency in order to produce stable electricity as well as heat regardless of cell stack development with own capability. Also, the fuel cell system can be applied with other renewable energy systems with high flexibility. Finally the prospect of the fuel cell technology can be forecast with the future energy spectrum.
메탄 자열 개질기의 동적 거동 및 정상 특성에 관한 수치적 연구
이신구(Lee, Shin-Ku),박준근(Park, Joon-Guen),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
In this paper, numerical investigation has been carried out to study performance of methane autothermal reformer and dynamic behavior for light-off under various operating conditions. In order to simulate the given problems, numerical methods are incorporated using finite-volume method. In addition, porous medium approach is accepted because the catalytic phenomena occur in porous media. Also, start-up issue is significant in autothermal reformer although the reaction is marginally exothermic. Thus, in this study transient behavior has been also investigated to find out optimal operating conditions for start-up.
수증기 개질 반응기 내의 열 및 물질전달 특성에 관한 연구
이신구(Lee, Shin-Ku),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
In this paper, heat and mass transfer characteristics through experimental and numerical study are extensively investigated in steam reform ins reactor under given operating conditions. In order to get simulated data at outlet of the reformer, heterogeneous reactor model is incorporated. As the reaction also takes place in porous media, two medium approach is used to take into account thermally non-equilibrium phenomena between catalyst and bulk gas. In steam reforming reaction, heat transfer issue is so significant that geometrical configuration study is also conducted.
효율적 수소 생산을 위한 메탄 수증기 개질 반응기에서의 불연속적 가스 유입의 영향
이신구(Lee, Shin-Ku),박준근(Park, Joon-Guen),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
Steam reforming reaction is a matured technology to get hydrogen from hydrocarbon fuels compared with other reforming reactions such as partial oxidation(POX), autothermal reforming(ATR). It is so endothermic that it needs heat source to activate the reaction. Due to the reaction characteristics, heat transfer limitation phenomena generally occur in the steam reformer. As one of new ideas, the effect of discontinuous gas feeding is investigated based on heat transfer characteristics. The new operating method is usually favorable at high GHSV region(i.e. over 10,000h^{-1}). In order to numerically simulate the physical issues, numerical approach is adopted based on heterogeneous reaction model, two-equation model in energy equation, and other constitutive models in porous media.