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Lee, Jeong Ah,Eom, Geun Hee,Park, Hyun Min,Lee, Ju Hoon,Song, Hyesun,Hong, Chang Seop,Yoon, Sungho,Kim, Cheal Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
Fluorescent organic molecules that respond to changes in the $Fe^{2+}$ concentration with selectivity to other abundant di-valent metal ions will offer the ability to understand the dynamic fluctuations of the $Fe^{2+}$ ion in interesting media. The use of 6-Br-ppmbi, derived from 2-pyridin-2-yl-benzimidazole, for metal ion-selective fluorescence recognition was investigated. Screening of the main group and transition metal ions showed exclusive selectivity for $Fe^{2+}$ ions even in the presence of competing metal ions. In addition, the requirement for low concentrations of probe molecules to detect certain amounts of $Fe^{2+}$ ions make this sensor unique compared to previously reported $Fe^{2+}$ ion sensors.
Lee, Jiho,Kim, Hwayoun,Lee, Hyesun,Jang, Seojun,Chang, Jeong Ho Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>Ordered nanoporous silicas containing various binary copper-manganese oxides were prepared as catalytic systems for effective carbon monoxide elimination. The carbon monoxide elimination efficiency was demonstrated as a function of the [Mn]/[Cu] ratio and reaction time. The prepared catalysts were characterized by Brunauer-Emmett-Teller (BET) method, small- and wide-angle X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HR-TEM) for structural analysis. Moreover, quantitative analysis of the binary metal oxides within the nanoporous silica was achieved by inductively coupled plasma (ICP). The binary metal oxide-loaded nanoporous silica showed high room temperature catalytic efficiency with over 98 % elimination of carbon monoxide at higher concentration ratio of [Mn]/[Cu].</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s11671-015-1197-4) contains supplementary material, which is available to authorized users.</P>
Domain-oriented variability modeling for reuse of simulation models
Lee, Hyesun,Yang, Jin-Seok,Kang, Kyo Chul,Pyun, Jai-Jeong SAGE Publications 2014 Simulation Vol.90 No.4
<P>Reusability is an important quality attribute for defense modeling and simulation (MS) due to the ever-changing combat simulations and new requirements. There has been research conducted worldwide for reusing simulation models. The methods proposed in these studies (including One Semi-Automated Forces (OneSAF)) support reuse of simulation components in the development of new models. As the reuse units in the existing methods are at the simulation component level, when existing components do not satisfy new simulation requirements, new components have to be developed and maintained separately from the existing ones. However, simulation components in the same domain tend to have common parts; behavior models for tactical missions and battlefield functions in the same domain are derived from the same tactical doctrine/manual, and thus they tend to have a common structure. There is a need for a new method to maximize reusability by providing “fine-grained” reuse, i.e. composing simulation components from reusable fine-grained modules (i.e. behaviors/functions). We address the problem by applying the product line engineering concept to the development of simulation components. Commonalities and variabilities (CVs) of domain-specific simulation requirements and CVs of tactical behaviors and battlefield functions are identified in domain-oriented variability modeling. Then, the CVs are used to design and implement domain-specific simulation component assets with domain-specific tactical behaviors and battlefield functions while embedding the identified variabilities. These domain-specific component assets are instantiated based on selections of variabilities and then integrated to develop a simulation model. Feasibility of the method was demonstrated in an infantry squad combat domain of the Republic of Korea armed forces.</P>
Lee, Hyesun,Chang, Jeong Ho Elsevier 2018 Materials chemistry and physics Vol.208 No.-
<P><B>Abstract</B></P> <P>This paper reports the controlled release of <I>citrus unshiu</I> extract from spherical silica hybrid liposome (silicified liposomes) particles. Silicified liposome particles were synthesized by silicification through the sol-gel reaction with TEOS as a silica source of the hydrophilic region of lecithin. In addition, we achieved the various characterization analyses such as SEM-EDS, DLS, FT-IR, and TGA, respectively. The silicified liposomes particles effectively entrapped as much as 314.2 mg/L solution of the <I>citrus unshiu</I> peel extract. After the <I>citrus unshiu</I> peel extract was entrapped in the silicified liposomes, the controlled release profile was investigated and the results showed that the maximum release was 41.4%. The release kinetics were fitted to various kinetic models, such as pseudo-first, pseudo-second-order kinetic and intra-particle diffusion models. The pseudo-second-order kinetic model showed good matching with the experimental release results. Furthermore, the antioxidant activity of <I>citrus unshiu</I> peel extract was measured by the DPPH free radical scavenging method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spherical silica hybrid liposomes particles were prepared by sol-gel reaction. </LI> <LI> <I>Citrus unshiu</I> extract was used for controlled release and cosmetic applications. </LI> <LI> Efficient amounts of <I>citrus unshiu</I> extract load and release were calculated. </LI> <LI> Release kinetic model was fitted to pseudo-second-order kinetic model. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
An Internet of Things System Architecture for Aiding Firefighters in the Scene of Disaster
( Hyesun Lee ),( Sang Gi Hong ),( Kang Bok Lee ) 한국정보처리학회 2018 Journal of information processing systems Vol.14 No.5
To support and protect firefighters in the scene of disaster, this research suggests an Internet of Things (IoT) system architecture that can be configurable and applicable to firefighting and rescue in various disaster situations. The proposed approach provides increased adaptability and reusability of systems compared to existing approaches. To validate the feasibility of the approach, a system of systems based on the architecture was developed and successfully tested for a specific firefighting and rescue scenario in a given test environment.
Case Report : Acute Pseudogout of the Neck: "Crowned Dens" Revisited
( Hyesun Lee ),( Hyeon Su Kim ),( Ui Hong Jung ),( Hyun Hee Kwon ),( Young Hwan Lee ),( Sung Hoon Park ) 대한류마티스학회 2016 대한류마티스학회지 Vol.23 No.2
Calcium pyrophosphate dihydrate crystal deposition disease is associated with an acute mono- or pauciarthritis, termed “pseudogout” in elderly patients, involving a large joint (including the knees, ankles) or a chronic arthropathy manifesting as mild joint pain and stiffness. Pseudogout is a crystal-deposition disease of peripheral joints, usually encountered in elderly patients. However, acute presentation of pseudogout around the odontoid process comprises a “crowned-dens” appearance, and requires contemplation of differential diagnoses. We recently experienced a case of pseudogout in the cervical spine presenting with fever and acute neck pain that was successfully treated with a colchicine and low-dose oral steroid. We reported this case with a review of the relevant literature. (J Rheum Dis 2016;23:122-124)