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Yang-Seop Bae,Young-Seuk Park,Tae-Soo Chon,Bong-Kyu Byun,Seunghwan Lee,Jong Kyun Park,Tak-Gi Lee 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
Recently, as the possibility of unexpected outbreaks of alien insects has increased due to climate change such as global warming, the importance of early control through rapid and accurate spread of exotic forest pest and change prediction diagnosis is required. This study summarizes and reports the followings: the establishment of monitoring strategy for exotic insects by the investigation of species distribution range through field surveys and others, the development of new diagnostic technique through microstructures and life-cycle, the dispersal of exotic insects, and ecological impact assessment using ecological methods and with the expansion of exotic insects and development of ecosystem impact prediction model.
Multifunctional Polyurethane Sponge for Polymerase Chain Reaction Enhancement
Seok, Seunghwan,Shin, Sujeong,Lee, Tae Jae,Jeong, Jae-Min,Yang, MinHo,Kim, Do Hyun,Park, Jung Youn,Lee, Seok Jae,Choi, Bong Gill,Lee, Kyoung G. American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.8
<P>Selective filtering of target biomaterials from impurities is an important task in DNA amplification through polymerase chain reaction (PCR) enhancement and gene identification to save endangered animals and marine species. Conventional gene extraction methods require complicated steps, skilled persons, and expensive chemicals and instruments to improve DNA amplification. Herein, we proposed an alternative method for overcoming such challenges by imparting secondary functionality using commercially available polyurethane (PU) sponges and cost-effective fabrication approaches through polydopamine and polysiloxane coatings. The porous, highly flexible, and chemically modified superhydrophilic and superhydrophobic PU sponges allow large surface areas and mechanically stable frames for effective extraction of genomic DNA through selective filtering of fish tissues and oils. Furthermore, these chemically modified PU sponges allow separation of genes and improvement of PCR for DNA amplification for the identification of fish species. The combination of a simple fabrication method and functionalized PU sponges could be a useful platform for PCR enhancement and gene-based identification of species for practical applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-8/am508101m/production/images/medium/am-2014-08101m_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am508101m'>ACS Electronic Supporting Info</A></P>
위승환(Seunghwan Wi),장성진(Seong Jin Chang),양성웅(Sungwoong Yang),김수민(Sumin Kim) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
One way to reduce building energy is to actively release or store thermal energy through phase change materials (PCMs) for efficient use of thermal energy. The PCM has major drawbacks that leak out during the solid-liquid phase transition. Therefore, the PCM must be applied to buildings through phase stabilization. Expanded vermiculite and expanded perlite are porous nano clay materials and have excellent properties as PCM containers. The applied PCM is n-octadecane, which belongs to the organic paraffin family, is thermally stable and has a high latent heat capacity. Shape stabilized PCM (SSPCM) is stabilized without chemical reaction by vacuum impregnation by physical bonding. The thermal properties of the prepared SSPCM are analyzed as DSC, TCi and enthalpy. Red clay SSPCM panels were developed using environmentally friendly building materials, red clay. The thermal performance of the manufactured panels is analyzed by a climate cycle test that takes into account daily temperature behavior.
Wi, Seunghwan,Yang, Sungwoong,Lee, Jongki,Chang, Seong Jin,Kim, Sumin Elsevier 2019 Journal of hazardous materials Vol.374 No.-
<P><B>Abstract</B></P> <P>The thermal performance of hybrid hollow plaster panels (HHPPs) was analyzed using the amount of phase change material (PCM) injection as a variable according to the size of the hollow area. This study focuses on <I>n</I>-octadecane, an organic PCM that is used for storing latent heat during the phase change range and to improve thermal transmittance using exfoliated graphite nanoplatelets (xGnPs), which have a high thermal conductivity. When xGnP is applied to <I>n</I>-octadecane, the thermal conductivity improves by 225%, and it is confirmed that the thermal storage or release of the phase change material is an active reaction. The thermo-physical properties of the xGnP and <I>n</I>-octadecane composites were analyzed using a thermal conductivity analyzer (TCi) and differential scanning calorimetry (DSC). The thermal stability of PCM was analyzed over a long duration of 10,000 thermal cycles. The thermal performance of the PCM/plaster composite panel using the dynamic heat transfer device was determined. The peak temperature through the HHPP significantly reduced by 3.8 ℃ in an internal room, and the time-lag effect was confirmed to be 1.56 h. The results indicate that up to 36.6 J/m<SUP>2</SUP> of thermal energy was stored in the 26-Px/O, corresponding to approximately 247% of the available thermal energy of the reference panel.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel HHPPs with excellent thermal energy storage capacity were developed. </LI> <LI> The thermal stability of PCM over a long period of analyzed through after 10,000 times thermal cycling. </LI> <LI> The peak temperature through the HHPPs was significantly reduced of 3.8 ℃ at internal room. </LI> <LI> Time-lag effect in the phase change transition of HHPPs occurred for up to 1.56 h. </LI> <LI> Up to 36.6 J/m<SUP>2</SUP> of thermal energy was stored in the 26-Px/O-HHPP. </LI> </UL> </P>
Wi, Seunghwan,Yang, Sungwoong,Park, Ji Hun,Chang, Seong Jin,Kim, Sumin Elsevier 2020 Building and environment Vol.167 No.-
<P><B>Abstract</B></P> <P>One of the ways to reduce building energy is to actively release or store the thermal energy through phase change materials (PCMs) to use heat energy efficiently. PCMs have the major drawback of leaking during the solid-liquid phase transition. Therefore, PCMs must be applied to buildings through phase stabilization. Expanded vermiculite (EV) and expanded perlite (EP) are porous nanoclay materials possessing excellent properties as containers for PCMs. The applied PCM is <I>n</I>-octadecane, which belongs to the organic paraffin series, is thermally stable, and has high latent heat capacity. Shape-stabilized PCM (SSPCM) is stabilized by the vacuum impregnation method by physical bonding only, without chemical reaction. The thermal properties of the prepared SSPCM are analyzed by DSC, TGA, TCi, and enthalpy calculation. The RC-SSPCMs panel is developed using red clay (RC), an eco-friendly building material. The thermal performance of the manufactured panels is analyzed by the climate cycling test, which considers the daily temperature behavior. In the analysis of the thermal performance, the peak temperature reduced by up to 1.6 °C during the phase transition of RC/EP-SSPCMs (P10), the time-lag effect in the phase change transition of RC/EP-SSPCMs (P10) occurred for up to 1.33 h.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SSPCMs were developed using expanded vermiculite and expanded perlite. </LI> <LI> The RC-SSPCM panels have excellent thermal energy storage capacity. </LI> <LI> Peak temperature reduced by up to 1.6 °C during the phase transition of PCM. </LI> <LI> Time-lag effect in the phase change transition of PCM occurred for up to 1.33 h. </LI> </UL> </P>
Sungwoong Yang,Seunghwan Wi,Sumin Kim 한국생활환경학회 2018 한국생활환경학회지 Vol.25 No.4
Simulation tools are actively used for various purposes of building energy analysis and evaluation and related research. Simulation tools provide built-in physical properties information of the building materials used in the building at the modeling stage to simulate the structure. However, this physical properties information database has practical usability problems such as diversity of measurement values, errors due to different unit values, and not covering new materials. Although such problems can be solved by accessing big data, there are not many studies on this way, and especially, there is no study on the physical properties of building materials. These problems can be solved by collecting actually measured physical properties of building materials, collecting physical properties information of website, and building a new database of building materials properties so this database is more diverse than the database embedded in the simulation tools and can be applied to diverse format of the simulation tools. The purpose of this study is to construct a web crawler based on Python language for effective use of simulation tools and to construct an information gathering algorithm for building new applicable material properties information. As a result of designing the data collection algorithm, it was able to automatically collect vast amounts of data on the website, filter unnecessary data, and convert it into a file of the applicable format. The result of this algorithm design can easily collect a large amount of data and apply it to the simulation tool, and it will be able to overcome the limitation of the database embedded in the simulation tools