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Torrefaction Effect on the Grindability Properties of Several Torrefied Biomasses
( Daru Setyawan ),( Jiho Yoo ),( Sangdo Kim ),( Hokyung Choi ),( Youngjoon Rhim ),( Jeonghwan Lim ),( Sihyun Lee ),( Dong Hyuk Chun ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.4
Torrefaction is the promising process of pretreating biomass materials to increase the quality of their energy, especially to upgrade the materials’ grindability so that it is suitable for a commercial pulverizer machine. In this study, torrefaction of oak, bamboo, oil palm trunk, and rice husk was carried out under different torrefaction temperatures (300 ℃, 330 ℃, and 350 ℃) and different torrefaction residence times (30, 45, and 60 minutes). Complete characterization of the torrefied biomass, including proximate analysis, calorific value, thermogravimetric analysis, mass yield, energy yield, and grindability properties (Hardgrove Grindability Index) was carried out. Increasing the torrefaction temperature and residence time significantly improved the calorific value, energy density (by reducing the product mass), and grindability of the product. Furthermore, for commercial purposes, the torrefaction conditions that produced the desired grindability properties of the torrefied product were 330 ℃-30 minutes and 300 ℃-45 minutes, and the latter condition produced a higher energy yield for bamboo, oil palm trunk, and rice husk; however, torrefaction of oak did not achieve the targeted grindability property values.
A Campus Community-based Mobility Model for Routing in Opportunistic Networks
( Daru Pan ),( Min Fu ),( Jiajia Sun ),( Xin Zou ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.3
Mobility models are invaluable for determining the performance of routing protocols in opportunistic networks. The movement of nodes has a significant influence on the topological structure and data transmission in networks. In this paper, we propose a new mobility model called the campus-based community mobility model (CBCNM) that closely reflects the daily life pattern of students on a real campus. Consequent on a discovery that the pause time of nodes in their community follows a power law distribution, instead of a classical exponential distribution, we abstract the semi-Markov model from the movement of the campus nodes and analyze its rationality. Then, using the semi-Markov algorithm to switch the movement of the nodes between communities, we infer the steady-state probability of node distribution at random time points. We verified the proposed CBCNM via numerical simulations and compared all the parameters with real data in several aspects, including the nodes` contact and inter-contact times. The results obtained indicate that the CBCNM is highly adaptive to an actual campus scenario. Further, the model is shown to have better data transmission network performance than conventional models under various routing strategies.
박한솔,( Daru Seto Bagus Anugrah ),안병현,임권택 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A biodegradable, near-infrared (NIR) - responsive hydrogel is one of the most promising strategies as a remotely triggered drug carrier. A novel NIR-responsive hydrogels based on alginate structures were prepared for controllable drug release. The hydrogels were formed rapidly by reacting norbornene-functionalized alginates and tetrazine cross-linkers containing diselenide bonds via inverse electron demand Diels-Alder click chemistry. NIR sensitive indocyanine green (ICG) and a drug, doxorubicin (DOX) were incorporated in the hydrogel matrix during gelation. The hydrogels showed a suppressed release profile under physiological conditions, while NIR light triggered a rapid release of DOX. Under NIR-light irradiation, ICG generated reactive oxygen species which could decompose diselenide bonds in the hydrogel matrix, inducing the gel-sol transition and release of entrapped DOX.
Yuni ASTUTI,Daru ASIH 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.4
This research empirically analyzed whether the foods which came from a non-Muslim majority country, such as South Korea, could play an important role in affecting the consumer intention in a predominantly Muslim country. Online survey methods were used to investigate the proposed hypothesis. 318 responses were used for further analysis. Forty-six reflective constructs were adapted from literature and designed by using a five-point Likert scale to facilitate measurement. Estimation models and structural models were examined through SEM-PLS analysis techniques using SmartPLS 3.0 application as the data processing tool. The results showed that religiosity and halal awareness had a positive and significant effect on attitude toward halal labels, including the mediating effect from consumer attitudes towards halal labels which had a positive but insignificant effect on purchase intention. Halal awareness plays an important role for Muslims in the decisionmaking process for purchasing food. In contrast to the initial hypothesis, the country of origin actually did not have a positive effect on attitudes towards the halal label. In a Muslim-majority country like Indonesia, findings halal food is not difficult, so this research basically is a reminder to marketers to follow those halal principles in implementing their marketing strategies.
Synthesis of Imide Functionalized Graphene Oxide via in situ Polymeriaztion Method
박한은,이시윤,( Daru Sato Bagus Anugrah ),임권택 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
This study was investigated the synthesis, characterization and properties of Imide group functionlized in graphene oxide. These nanocomposites were prepared via in situ polymerization using the amine group functionalized in graphene oxide, monomer of polyimide [(4,4'-(Hexafluoroisopropylidene)diphthalic anhydride, Bis(3-aminophenyl) Sulfone] and acetic anhydride, pyridine as a catalyst. Initially, Graphene Oxide (GO) was functionalized using ethylene diamine (EA), which was reacted with dianhydride monomer. After that GO-PI was synthesized using in situ polymerization. The synthesized polymers were characterized by means of FT-IR, TGA, TEM.
최원태,임권택,( Daru Seto Bagus Anugrah ),( Sabrina Aufar Salma ),( Cuong M. Q. Le ) 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Chemical cross-linking of polymer incorporated multi-walled carbon nanotubes was prepared by azide-alkyne cycloaddition click chemistry. Firstly, block copolymer of poly(styrene-alt-maleic anhydride) (PSMA) were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization. The highly reactive anhydride units were functionalized with furfuryl amine and propargyl amine in a one-pot reaction affording alkyne-furan bifunctional PSMA block copolymer (PSAF). The PSAF chains were covalently anchored to the surface of MWNTs affording PSAF/MWNTs by the Diels-Alder reaction in water under ultrasound assistance. Then, azide-alkyne cycloaddition click reaction took place between the PSAF/MWNTs and bis-(azidoethyl) disulfide as a crosslinking agent in the presence of Cu(0) wire/PMDETA. The obtained hybrid materials were characterized by TGA, FT-IR, Raman spectroscopy, and TEM analysis. The cross-linked PSAF/MWNTs could well enhance electrical conductivity.