http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Sonita ENG,최성용 연세대학교(미래캠퍼스) 빈곤문제국제개발연구원 2014 地域發展硏究 Vol.23 No.2
SEs (Social Enterprises) have been recognized as the new frontier of sustainable economic development in developing countries. This study focuses on identifying the impacts on the development in Cambodian tourism SEs. In this exploratory study, four keys factors, the legal framework, financing, ownership, and social capital, are initially discussed to find more specific impacts in a hierarchical structure. We also study the impacts analytically using a hybrid A’WOT method, which is an adaptation of AHP (Analytic Hierarchy Process) in the SWOT (Strength, Weakness, Opportunity and Threat) analysis. By conducting pairwise comparisons between the factors, we could obtain the relative weight of importance for each factor empirically based on an expert survey. Finally, we provide critical discussions pertaining to the findings in this paper to identify potential factors that enable the further development of SEs in developing countries.
톱니모자반 추출물의 oil-in-water 나노에멀젼 제조 및 특성 연구
박한솔,Sonita Afrita Furba Siboro,임수진,김형락,임권택 한국화상학회 2019 한국화상학회지 Vol.25 No.4
본 연구에서는 우수한 미백 및 주름 개선 기능을 갖는 천연 유래 해초추출물 톱니모자반 추출물(학명 Sargassum serratifolium, MES)의 저장 안정성과 피부투과성을 향상시키는 목적으로 oil-in-water (O/W) 나노 에멀젼 구조를 적용하였으며 나노에멀젼에 대한 최적의 제조 조건을 연구하였다. 톱니모자반으로부터 추출되어 농축, 탈염 및 탈당 과정을 거친 MES의 주성분은 소수성의 활성성분으로 구성되어 있어 산화가 쉽게 일어나고 화장품 성분으로 사용하기에는 적합하지 않다. 본 연구에서는 PEG 400, 폴리옥실 캐스터오일 (EL), Poloxamer 407 등 다양한 계면활성 제와 첨가제 성분을 사용하여 MES가 함유된 O/W 나노에멀젼을 제조하였다. 그 과정에서 사용된 구성성분의 배합순 서와 화학적 조성 비율이 미치는 영향을 체계적으로 연구하였다. 최적화된 조건에서 제조된 나노에멀젼의 평균 크기는 20 ~ 30 nm 범위로 나타났으며, 시간 변화에 따른 나노에멀젼의 멜라닌 합성 억제 효율 성능은 5 사이클의 시간 변화에도 큰 차이가 없었다. 이것은 나노에멀젼의 우수한 장기간 저장 안정성과 피부투과성을 시사한다. In this study, nano-emulsion structures were employed in order to improve the storage stability and dermal permeability of naturally derived seaweed extracts (the scientific name Sargassum serratifolium, MES) with excellent whitening and crease improvement, and the optimal preparation condition for the nano-emulsions were investigated. The MES, obtained using the concentration, decontamination, and desalination process of the extracts, consists of active ingredients of hydrophobic property and is not suitable for cosmetic materials due to easy oxidation. In this study, O/W nano-emulsions encapsulating MES were prepared using various surfactants and additives such as polyoxyl caster oil EL, Poloxamer 407, and PEG 400. The combined sequence of components used in the process and the effect of the chemical composition ratio were studied systematically. The average size of nano-emulsions prepared under optimized conditions was in the range 20 ~30 nm, and the performance of the melanin synthesis efficiency of the nano-emulsion was not changed appreciably after the time change of 5 cycles, indicating their excellent long-term storage stability and dermal permeability.
Effect of Porosity in Alginate Hydrogels on the Drug Release Behavior
조성우,Sonita Afrita Purba Siboro,이시윤,박찬,임권택 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In this study, two kinds of alginate-based hydrogel were prepared: alginate-furfuryl amine (Alg-F) crosslinked by disulfide-maleimide (S-Ma) and alginate-norbornene (Alg-Nb) crosslinked by disulfide-tetrazine (S-Tz). The “click” chemistry between Alg-Nb and S-Tz during gelation was producing N2 gas and led to the formation of hydrogels with porous structure, in which the porosity could be tuned by adjusting the proportion of crosslinker. As for the crosslinking reaction between Alg-F and S-Ma was performed by DA reaction, which did not produce any by-product and led to the formation of non-porous hydrogel. The drug release study revealed that hydrogel porosity affected drug loading capacity and played a significant role in the kinetics of drug release. days in a sustained manner.
박한솔,( Sonita A. P. Siboro ),이시윤,이근대,김형락,임권택 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Nanoemulsion oil-in-water (O/W) is generally used to deliver oil-based cosmetic in aqueous media. Nevertheless, producing fine nanoemulsion with uniform nano-sized and high stability is quite challenging, especially when deal with natural products. In this study, we report a formation of micellar nanoemulsion to deliver natural oil-based cosmetic meroterpenoid-rich fraction from the ethanolic extract of Sargassum macrocarpum (MES) using amphiphilic block copolymer. The effects of micelles preparation were systematically investigated in order to achieve optimum nanoemulsion size and stability. The results showed that the mixing order and rasio O to W are crucial factors determined the micelles’ size. In addition, we also analyse the amount of MES that loaded into the micelles core under various conditions and compositions using spectroscopic technique.
박한솔,( Sonita Afrita Purba Siboro ),이시윤,임권택 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The current study aimed to report the effect of hydrogel porosity, which may be controlled by the design of crosslinkers, on drug release behavior. Porous alginate-based hydrogels were prepared from the inverse electron demand Diels-Alder reaction of alginate-norbornene (Alg-Nb) and disulfide-tetrazine (S-Tz). The porosity of hydrogels could be controlled by adjusting the amount of S-Tz crosslinker. Gel formation was facilitated by a “click” reaction between Nb and Tz, which produced nitrogen gas, which in turn, acted as an in-situ pore generator. Proportion of crosslinker and porosity were concluded to be significant factors for drug release behavior of hydrogels.
( Kalyan Ramesh ),( Sonita A. P. Siboro ),박찬,임권택 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In the present study, a series of amphiphilic AB2-type miktoarm star block copolymers consisting of hydrophobic poly(L-lactide) (PLLA) as a A arm and hydrophilic poly(N-acryloylmorpholine) (PNAM) as two B arms were synthesized via the combination of ring opening polymerization and xanthate-mediated reversible addition-fragmentation chain transfer polymerization. Resultant polymers were analyzed by 1H NMR spectroscopy and gel permeation chromatography. Aggregation properties of the amphiphilic miktoarm star block copolymers were studied by fluorescence spectroscopy, transmission electron microscopy and dynamic light scattering. Doxorubicin (DOX)was successfully loaded into the miktoarm star block copolymer micelles. The result revealed that DOX release was enhanced as the pH reduced from 7.4 to 6.4.
Nader Pourmahmoud,Sajad Rezazadeh,Iraj Mirzaee,Sonita Motaleb Faed 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
This article presents the results of a numerical investigation, using a comprehensive three-dimensional, single phase, non-isothermal and parallel flow model of a PEM fuel cell with deflected membrane electrode assembly (MEA). This numerical research has concentrated on the deflection parameter (δ) that affects this type of fuel cell performance. The model accounts simultaneously for electrochemical kinetics, current distribution, hydrodynamics, and multicomponent transport. A set of conservation equations valid for flow channels, gas-diffusion electrodes, catalyst layers, and the membrane region are developed and numerically solved using a finite-volumebased computational fluid dynamics technique. Because of importance of base model fuel cell (δ = 0), initially the CFD result of polarization curve has been validated with the available experimental data which shown good agreement. Introducing of deflection parameter as a criterion for creating of a new geometry, shown that fuel cell performance increases rather than base model, since the face width increases and more reactants diffuse through the gas diffusion layer (GDL) to the reacting area. Also, when this parameter reaches to its maximum value equal to channel height, the fuel cell performance has been maximized in high current densities region. The further numerical results including of temperature distribution, oxygen, and water mass fraction in deflected membrane full cell are derived and discussed in the more details with respect to various values of deflection parameter. Finally, the obtained numerical results shown reasonable features in describing of deflected fuel cell behavior.