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Lee, Hyung Won,Kim, Young-Min,Lee, Boram,Kim, Seungdo,Jae, Jungho,Jung, Sang-Chul,Kim, Tae-Wan,Park, Young-Kwon Elsevier 2018 CATALYSIS TODAY - Vol.307 No.-
<P><B>Abstract</B></P> <P>The catalytic copyrolysis of torrefied cork oak (TOak) and high density polyethylene (HDPE) over mesoporous HY catalysts was performed using a tandem μ-reactor-gas chromatograph/mass spectrometry/flame ionization detector. Two types of mesoporous HY catalysts with different acidity, MesoHY-1 and MesoHY-2, were prepared by pseudomorphic synthesis with various surfactant ratios. For comparison, a commercial microporous HY was also used as a catalyst. The properties of the catalysts were measured by N<SUB>2</SUB>-sorption, X-ray diffraction, and NH<SUB>3</SUB>-temperature programmed desorption. Compared to the catalytic pyrolysis of cork oak (Oak), that of TOak produced a larger amount of mono aromatic hydrocarbons (MAHs) over all HY catalysts. The catalytic copyrolysis of TOak and HDPE over micropore HY and MesoHY-1 produced a larger amount of MAHs than that over MesoHY-2 due to the higher acidities. Although both micropore HY and MesoHY-1 have similar acidity, MesoHY-1 showed stronger synergy for the formation of MAHs on catalytic copyrolysis than micropore HY owing to its larger pore, which allows the easier diffusion of HDPE reaction intermediates into the pore of the catalysts.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Catalytic copyrolysis of cork oak and HDPE was performed. </LI> <LI> Microporous HY and mesoporous HY zeolites were used as catalysts. </LI> <LI> Mesoporous HY showed higher production rate of aromatics than microporous HY. </LI> <LI> Production of aromatic hydrocarbons was improved by the torrefaction of cork oak. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Catalytic Pyrolysis of Geodae-Uksae 1 Over Mesoporous Materials Produced from Zeolite Hbeta
Lee, In-Gu,Kim, Young-Min,Lee, Hyung Won,Jeon, Jong-Ki,Lee, Heejin,Jung, Sang-Chul,Kim, Seungdo,Watanabe, Atsuichi,Park, Young-Kwon American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>Mesoporous materials produced from zeolite HBeta, (MMZHBeta) with different Si/AI ratios were synthesized and applied for the first time to the catalytic pyrolysis of Geodae-Uksae 1, a new energy crop discovered in South Korea. The non-catalytic pyrolysis and in-situ catalytic pyrolysis of Geodae-Uksae 1 were tested rapidly using a pyrolyzer-gas chromatography/mass spectrometry/flame ionization detector/thermal conductivity detector. The main pyrolyzates of Geodae-Uksae 1 consisted of levoglucosan, acetic acids, furans, and phenolics, which were upgraded efficiently into furans and aromatics using the MfV148,,a catalysts. Between the MMZHoeta catalysts, MMZHeeta (25) produced larger amounts of furans and aromatics than MMZHeeta (300) owing to its higher acidity. The increase in the catalyst to biomass ratio (from 2/1 to 6/1) and reaction temperature (from 500 to 600 degrees C) enhanced the formation of aromatics.</P>
이승도 ( Lee Seungdoe ),김상원 ( Kim Sang Won ) 한국시스템다이내믹스학회 2020 한국시스템다이내믹스 연구 Vol.21 No.4
The purpose of this study is to suggest work-in-process, throughput, and cycle time as measures of day to day monitoring for the front-line managers. In capital intensive industries where gathering more returns from their expensive assets is important, it is common that their management focuses on, among other indices, utilization whose numerator (i.e., work volume) and denominator (i.e., capacity) are not expected to be controllable by the operations function. In this study, a case study of an automotive subcontractor whose operations alone explains most of its profit was performed and transactions - the amount of upstream factory’s incoming orders and daily production were obtained and examined through ‘internal benchmarking,’ a framework that operations managers can self-evaluate his/her factory’s current state. The company’s shop floor was modeled with stock flow diagram and simulated to show how a different production plan could result in avoidance of excessive cycle time.
이승도(Seungdo Lee),양현(Hyun Yang),주요한(Yohan Joo),박창윤(Changyun Park),정충일(Chungil Jung) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.2D
무선 랜의 보급이 보편화 되면서 간섭을 일으키는 범위 내에 같은 채널을 사용하는 무선 AP의 수가 증가 하게 되었고 간섭 범위 내에서 무선 랜을 사용하는 사용자들 또한 많아 지게 되었다. 이러한 환경의 변화에 따라 제어 프레임들과 데이터 프레임들간의 충돌 데이터 프레임들 간의 충돌이 잦아 지게 되면서 무선 랜 성능의 저하가 심화되었다. 본 논문에서는 이러한 무선 환경의 변화에 따른 무선 랜 성능의 저하를 해결하기 위하여 TCP단의 몇 가지 수정을 통하여 무선 랜 성능을 향상시키는 방법에 대하여 기술하고 실제 환경에 적용시켜 성능 평가를 하였다.
이주용(Ju-Yong Lee),정승도(Seungdo Jeong),이지훈(Ji-Hoon Lee) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.10
최근 스마트기기의 높은 보급률 및 컴퓨팅 기술의 발전으로 인하여 단순히 정보를 검색하는 사용 패턴에서 벗어나 사진 및 동영상 등의 멀티미디어에 관한 사용자의 관심이 증대되고 있다. 이러한 관심 증대로 인하여 다양한 응용을 위해 이미지를 생성하고 처리하는 이미지 프로세싱에 대한 기술이 발전하고 있다. 최근 자신이 좋아하는 연예인 등의 여러 개의 작은 이미지들을 이용하여 모자이크로 표현하는 엔터테인먼트적인 사례들이 등장하고 있으며 모자이크 기법에 대한 연구 또한 활발히 진행 중이다. 하지만 기존의 모자이크 기법들 데이터베이스의 이미지를 선형적으로 비교하기 때문에 데이터베이스 이미지수가 증가함에 따라 비교 연산처리 시간이 증가하는 단점이 있다. 긴 연산처리 시간을 가진다. 따라서 본 논문에서는 효율적인 검색을 위해 DCT 해쉬를 이용하는 모자이크 이미지 생성 알고리즘을 제안한다. 제안한 알고리즘은 데이터베이스 생성 단계와 모자이크 생성 단계로 구성된다. 데이터베이스 생성 단계에서는 데이터베이스 구축을 위한 이미지들을 블록 단위로 분할하고 분할된 영역에 대한 DCT 해쉬 셋을 생성하여 저장한다. 모자이크 생성 단계에서는 입력 이미지의 각 블록에 대하여 DCT 해쉬를 통해 데이터베이스 내의 가장 유사한 블록을 효율적으로 검색하고, 최종적인 모자이크 이미지를 생성한다. 다양한 실험을 통해, 제안된 알고리즘이 다양한 종류의 이미지 및 크기에 상관없이 효과적으로 모자이크가 생성됨을 보였다. With the current high distribution rate of smart devices and the recent development of computing technology, user interest in multimedia, such as photos, videos, and so on, has rapidly increased, which is a departure from the simple pattern of information retrieval. Because of these increasing interests, image processing techniques, which generate and process images for diverse applications, are being developed. In entertainment recently, there are some techniques that present a celebrity"s image as a mosaic comprising many small images. In addition, studies into the mosaic technique are actively conducted. However, conventional mosaic techniques result in a long processing time as the number of database images increases, because they compare the images in the databases sequentially. Therefore, to increase search efficiency, this paper proposes an algorithm to generate a mosaic image using a discrete cosine transform (DCT) hash. The proposed photo mosaic-generation algorithm is composed of database creation and mosaic image generation. In database creation, it first segments images into blocks with a predefined size. And then, it computes and stores a DCT hash set for each segmented block. In mosaic generation, it efficiently searches for the most similar blocks in the database via DCT hash for every block of the input image, and then it generates the final mosaic. With diverse experimental results, the proposed photo mosaic-creation algorithm can effectively generate a mosaic, regardless of the various types of images and sizes.
Facile synthesis of carbon layered TiO2 nanocomposite for high photocatalytic activity
Vijayarohini Parasuraman,Muhammad Awais Aslam,Parasuraman Perumalswamy Sekar,Van-Quyet Nguyen,Ye eun Lee,Hojae Lee,Woo Ram Lee,Seungdo Kim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
A green synthesis route was designed to develop a visible-light-driven thin carbon layered titanium dioxide(CLT) nanocomposite using ascorbic acid as carbon precursor. The presence of a thin layer of carbon(CLT) on the TiO2 surface was observed from HR-TEM. The thickness of CLT is directly proportional to theconcentration of carbon precursor, where this CLT acts a photosensitizer for harvesting the broad band ofvisible light spectrum. CLT nanocomposite (15.485 m2/g) showed an improved surface area of 1.4 timesthat of a commercial TiO2 (7.461 m2/g). The photocatalytic activity of CLT nanocomposite was investigatedfor the volatile organic compound destruction using p-xylene pollutant in a standard ISO photocatalyticoxidation reactor under daylight. The mechanism pathway of CLT nanocomposite was followed bythe adsorption of chemical contaminants in the pores of CLT that precisely capture the contaminants captureand destruction on its surface. The electron-hole pair recombination rate of CLT nanocomposite waslower than the pristine TiO2 was evident from photoluminescence spectra. The antibacterial activity ofCLT was also studied using E. coli as a model pathogen. This environmentally friendly photocatalyst CLToffers a novel route for good industrial utilization because of its low cost and mass production.