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( Taeseong Han ),( Younghyun Gwon ),( Sunho Park ),( Yubin Jeon ),( Hyoseong Kim ),( Jangho Kim ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.2
Nanoscale manufacturing has enabled the development of smart packaging systems for the functional and convenient distribution of food products, overcoming the major bottlenecks to the future fabrication of stable, safe, economically feasible, and environmentally friendly food packaging systems. For example, nanotechnology can provide more functions of packaging systems to maintain, preserve, and sustain food products. In this work, we proposed a national design of biodegradable packaging nanoporous films (PNFs) to improve food quality preservation using polycaprolactone (PCL), biodegradable polymer, in combination with the nanofabrication technique. As a model study, we stored tomatoes with PCL PNFs in room and refrigerated temperature, respectively. Compared to conventional packaging films (i.e., polystyrene films), the PCL PNFs could retain the intact appearances of tomatoes. We also showed the higher mechanical property of tomatoes stored with the PCL PNFs than that of tomatoes with conventional packaging films, suggesting that the PCL PNFs could maintain food quality owing to probably the unique nanopore properties. We believe that biodegradable nanoporous films may be used as a new strategy to design smart food packaging systems for improving food quality preservation.
Long-term catalytic durability in Z-scheme CdS@ 1T-WS2 heterojunction materials
Taeseong Kim,Hyerim Park,Byung Hyun Park,Seog Joon Yoon,유춘리,Sang Woo Joo,손남규,Misook Kang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
This study aimed to improve the long-term durability of CdS catalysts by reducing the deterioration ofcatalytic activity caused by photocorrosion. An ultrathin 1T-WS2 2D nanosheet was introduced to enclosethe CdS nanorods. The crystal defects in the wrapped CdS particles were reduced, and the WS2 sheetbecame thinner in the junction particle. The 2CdS@1WS2 junction particle exhibited the slowest decaytime of the photoluminescence curve, and the photocurrent density increased by more than 3.5-fold inthe junction particle than the single CdS particle. Eventually, the optimized 2CdS@1WS2 catalyst exhibiteda high rate of H2 production of 3935 lmol g 1h 1 under simulated solar light irradiation with aquantum efficiency of 50%. Although the recycling experiment was repeated over 10 times using the2CdS@1WS2 junction particle, the produced hydrogen amount did not decrease. This result is becauseCdS nanorods wrapped stably by the ultrathin WS2 nanosheets, which suppressed the photocorrosionof CdS, and furthermore, the 1T phase WS2 rapidly attracted photogenerated electrons from CdS, facilitatingcharge separation and inhibiting their recombination, thereby improving the catalyst activity. Finally,it was revealed that an effective Z-scheme charge transfer mechanism in the CdS@1T-WS2 junction particlefollows during water splitting.
강태성 ( Taeseong Kang ),신민환 ( Minhwan Shin ),금동혁 ( Donghyuk Kum ),김종건 ( Jonggun Kim ),임경재 ( Kyoungjae Lim ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-
강우시 밭에서 발생하는 강우유출수는 토사와 함께 하천에 유입되어 수질 악화 및 탁수 등의 환경 문제를 발생시킨다. 이에 국내·외에서 비점오염원 발생원 관리를 위한 최적관리기법(Best Management Practices, BMPs)의 개발을 위해 다양한 연구가 진행되고 있다. 본 연구에서는 상대적으로 연구가 미비한 유공관과 바이오 필터를 BMP로 선정하여 강원도 춘천시 서면 방동리에 시험포를 설치하여 시험포별 유출량 및 수질 모니터링을 수행하였으며, 모니터링 결과를 바탕으로 유공관과 바이오 필터의 직접유출수와 수질농도 저감효과를 분석하였다. 대조구, 유공관, 그리고 바이오 필터 3개의 시험포를 설치하였으며, 폭 3 m, 길이 10 m로 동일하게 조성하였다. 유공관 시험포는 토양의 표면에서 0.3m 깊이에 10 m의 길이로 직경 400 mm를 설치하였으며, 유공관과 바이오필터를 함께 설치한 시험포에는 유공관과 동일한 깊이에 8 m의 길이로 설치하였다. 바이오 필터의 채움재는 우드칩을 토양의 표면에서 0.3 m 깊이에 길이 2 m, 폭 3 m로 설치하였다. 2020년 5월부터 8월 중순까지 총 10회에 걸쳐 유출량과 수질농도를 분석한 결과 대조구는 0.013∼2.519 ㎥, 유공관 0.007∼0.884 ㎥, 바이오 필터 0.007∼0.754 ㎥의 평균 유출량이 발생하였으며, 강수량이 제일 많이 발생한 6차 조사(244.0 mm)에서 유출량도 가장 많이 발생한 것으로 나타났다. 대조구 대비 유출량 저감효과를 분석한 결과 유공관은 20.0∼92.7%(평균 52.8%), 바이오 필터는 -13.4∼93.0%(평균 52.6%)가 저감된 것으로 나타났다. 시험경작지별 발생한 유출량과 수질농도를 이용하여 총 오염부하를 비교한 결과, 전체 수질 항목에서 유공관 시험포의 총 오염부하가 가장 낮은 것으로 나타났다. 대조구 대비 오염부하(BOD, COD, SS, T-N, T-P, TOC) 저감효과를 분석한 결과, 유공관 시험포 75.1∼85.0%(평균 80.0%)와 바이오 필터 시험포 35.5∼80.9%(평균 62.3%)의 저감효과가 있는 것으로 나타났다. 본 연구에서 수행한 저감시설들은 실제 영농환경과 동일한 조건에서 진행되었으며, 연구결과와 같이 유공관과 바이오 필터는 직접유출과 오염부하를 효과적으로 저감할 수 있는 것으로 나타났다. 본 연구의 결과는 향후 비점오염원 저감을 위한 다양한 최적관리기법 선정·적용 및 저감 정책을 위한 기초자료로 활용될 수 있을 것으로 판단된다.
Multi-Level modeling and access control for data sharing in collaborative design
Kim, Taeseong,Cera, Christopher D.,Regli, William C.,Choo, Hyunseung,Han, JungHyun Elsevier 2006 ADVANCED ENGINEERING INFORMATICS Vol.20 No.1
<P><B>Abstract</B></P><P>This paper presents a method for securing collaborative design using multi-level modeling. When a team of designers works collaboratively on a 3D assembly model, a component of the assembly is presented in a full detail to those who have full access privileges to the component, but in an abstract level of detail to those who have less access privileges. Such various levels of detail can be created in two phases: volumetric feature removal which is achieved through interactive feature recognition on the CAD model, and multi-resolution mesh construction which is based on polygonal simplification. Appropriate representations of the assembly are extracted by direction of access matrix, and then presented to the users participating in collaborative design. The key issues in developing the secure collaborative design system are discussed, and the implementation results are reported.</P>
New Cerebrosides from a Marine Sponge <i>Haliclona</i> (<i>Reniera</i>) sp.
Park, Taeseong,Mansoor, Tayyab Ahmad,Shinde, Pramod Bapurao,Bao, Baoquan,Hong, Jongki,Jung, Jee Hyung The Pharmaceutical Society of Japan 2009 Chemical & pharmaceutical bulletin Vol.57 No.1
<P>A chemical investigation of the MeOH extract of a marine sponge <I>Haliclona</I> (<I>Reniera</I>) sp., collected off the coast of Ulleung Island, Korea, led to the isolation of thirteen new cerebrosides (1—3, 5—14), along with a known analogue (4). Their structures were elucidated on the basis of 1D and 2D NMR spectroscopy, MS spectrometry, and chemical method. The major new features of these glucocerebrosides are C<SUB>15</SUB> and C<SUB>19</SUB> acyl chains, long (C<SUB>24</SUB>–C<SUB>28</SUB>) acyl chains, or the <I>S</I>-configuration of the acyl chains. It is noteworthy that both <I>R</I>- and <I>S</I>-configurations of the acyl chains were observed in the same specimen.</P>