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Choi, Ji Hyun,Seo, Hojun,Park, Ju Hyang,Son, Jin Ho,Kim, Da In,Kim, Jongbok,Moon, Geon Dae,Hyun, Dong Choon Elsevier 2019 Colloids and surfaces. B, Biointerfaces Vol.173 No.-
<P><B>Abstract</B></P> <P>This work introduces a new fibrous system for synergistic cancer therapy. The system consists of poly(<SMALL>D</SMALL>,<SMALL>L</SMALL>-lactic-co-glycolic acid) (PLGA) fibers with a core encapsulating an anticancer drug and a shell entrapping gold nanorods (AuNRs) as a photothermal agent. On exposure to NIR light, the photothermal agent generates heat to raise the local temperature of the fibers. If the temperature is above a glass transition (<I>T<SUB>g</SUB> </I>) of the polymer, the polymer chains will be mobile, increasing free volume in size within the shell. As a result, a rapid release of the drug can be achieved. When NIR light is turned off, the release will stop with inactivity of the photothermal agent, followed by freezing the segmental motion of the polymer chains. The on–off switching of NIR light in a time-controllable manner allows a repeated and accurate release of the drug, leading to the significant enhancement of anticancer activity in combination with the hyperthermia effect arising from the photothermal agent.</P> <P><B>Highlights</B></P> <P> <UL> <LI> AuNR-incorporated PLGA hollow fibers have been fabricated. </LI> <LI> The fibers release pre-loaded anticancer drug in response to NIR light. </LI> <LI> The on–off switching of NIR light allows a repeated dosing of the drug. </LI> <LI> The on-demand release has a synergistic anticancer activity with PTT. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park, Ju Hyang,Choi, Ji Hyun,Son, Jin Ho,Hwang, Se Jeong,Seo, Hojun,Kang, Inn-Kyu,Park, Minwoo,Kim, Jongbok,Hyun, Dong Choon Butterworth Scientific Ltd. etc. 2018 Polymer Vol. No.
<P><B>Abstract</B></P> <P>This paper describes a new system for NIR light-triggered, localized release of drugs. The system consists of biocompatible/degradable poly(ε-caprolactone) (PCL)-based fibers having a core loaded with doxorubicin (DOX) and a sheath incorporated with indocyanine green (ICG) as a NIR-absorbing agent together with a biocompatible/degradable, phase-changeable fatty acid. Upon NIR irradiation, the photothermal agent will generate heat to raise the local temperature of the fibers. When the temperature is above the melting point of the fatty acid, nano-pores will be generated in the fibers. This response to NIR irradiation allows the instant release of DOX from the fibers through the pores, leading to the significant enhancement of anticancer activity in combination with the hyperthermia effect arising from the photothermal agent.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Poly(ε-caprolactone) fibers incorporated with phase-changeable fatty acid and indocyanine green (ICG) have been fabricated. </LI> <LI> The prepared fibers release pre-loaded anticancer drug in response to NIR light irradiation. </LI> <LI> The NIR triggered release leads to the enhancement of anticancer activity in combination with the hyperthermia effect by ICG. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Thermal annealing-driven surface sealing of polymeric bowl
Hwang, Se Jeong,Park, Ju Hyang,Son, Jin Ho,Choi, Ji Hyun,Seo, Hojun,Park, Minwoo,Kim, Jongbok,Moon, Geon Dae,Hyun, Dong Choon Butterworth Scientific Ltd. etc. 2018 Polymer Vol. No.
<P><B>Abstract</B></P> <P>We investigate surface sealing behavior of polymer hollow particles with an open hole on their surfaces during thermal annealing. A series of processes involving synthesis of polystyrene (PS) solid particles, their swelling with the use of a swelling solvent, and freeze-drying enable us to make hollow particles with a controllable structure including outer/inner diameter and surface hole size. Based on structural change of the hollow particles experimentally observed during thermal annealing above the glass transition temperature of the polymer, we analyze theoretically the sealing behavior of the hollow particles. The experimental and theoretical results conclude that the structure of as-prepared hollow particles determines whether the successful sealing of the particles can be achieved or not.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Polystyrene hollow particles with a surface hole were fabricated by a series of processes of swelling and freeze-drying. </LI> <LI> Their surface sealing behavior driven by thermal annealing was experimentally observed and theoretically analyzed. </LI> <LI> The results conclude that the structure of as-prepared hollow particles is critical for achievement of their sealing. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
MANET에서 악의적인 노드의 안전하고 효율적인 검출 방안
이강석,최종오,지종복,송주석,Lee KangSeok,Choi JongOh,Ji JongBok,Song JooSeok 한국정보처리학회 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.12 No.5
최근 MANET에서의 연구는 보안을 고려한 라우팅 서비스에 주목되어 왔으나 기존에 제시되었던 MANET에서의 악의적인 노드를 식별하는 방안들은 거짓 신고하는 악의적인 노드가 있을 때에는 이를 적절히 식별하고 제거하지 못하는 문제점이 있었다. 따라서 본 논문에서는 신고자와 혐의자 목록으로 구성되는 신고 메시지와 신고 테이블을 이용하여 경로 설정단계에서는 정상적으로 동작하지만 데이터 전달 과정에서는 데이터를 버리거나 내용을 변경시키는 행위, 또는 다른 노드를 거짓으로 신고하는 등의 악의적인 노드를 식별하는 효율적인 방안을 제안한다. 제안하는 방안은 DSR 과 AODV에 모두 적용 가능하다. 또한 성능분석을 위해 AODV와 제안된 알고리즘과 비교 분석하여 제안된 알고리즘이 평균 분실률 및 전송량 측면에서 현격한 성능차이를 있음을 보였다. Lately, the MANET research has focused on providing routing services with security and previous schemes have been proposed for detecting malicious nodes in a MANET. However, they still include some problems which malicious nodes cannot be found when they falsely report other nodes as malicious. Accordingly, we propose a novel and efficient scheme for detecting malicious nodes using report messages and a report table which is consisted of node ID both for suspecting and reporting when the malicious nodes behave normally during the route discovery, but the other hand they drop and modify packets, or falsely report other nodes as malicious during the data transmission. Our proposed scheme is applicable to not only DSR but aiso AODV. And we provide some simulation results of our proposed scheme by comparing general AODV with our proposed scheme. Simulation results show that our Proposed scheme outperforms general AODV in terms of average packet loss ratio and packet delivery ratio.
Da In Kim,Ju Hyang Park,Hojun Seo,Sang Gi Hong,Hye Ji Kim,Hyungju Ahn,Jongbok Kim,문건대,Dong Choon Hyun 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
This work demonstrates the fabrication of cationic polymer particles with controllable and complexstructures for the high immobilization of noble-metal nanoparticles (NPs). The fabrication involves theuse of a cationic extra monomer to synthesize polystyrene (PS) solid spheres with cationic character,followed by their transformation into complex-structured particles via the phase separation route in aseeded dispersion polymerization. Control of the phase separation enables the formation of PS particleswith cage- and bowl-like shapes as well as hollow structures. The large surface areas of the complex-structured particles, as theoretically calculated using simple models, and the electrostatic attractionbetween them and the negatively charged noble-metal NPs, as experimentally observed, allow the highimmobilization of noble-metal NPs onto their surfaces.
Son, Jin Ho,Kim, Da In,Park, Ju Hyang,Seo, Hojun,Hong, Sang Gi,Choi, Ji Hyun,Kim, Jongbok,Moon, Geon Dae,Hyun, Dong Choon Elsevier 2019 Polymer Vol.167 No.-
<P><B>Abstract</B></P> <P>We study thermal annealing-driven surface sealing of polymer hollow particles with a different surface property. Use of phase separation between polystyrene (PS) solid particles incorporated with sulfonate (SO<SUB>3</SUB> <SUP>-</SUP>) group and decane allows their transformation into hollow particles with an opening on the surface. Control of the phase separation enables us to tune the structure (outer and inner diameters, and size of the opening) of the hollow particles. While thermally annealed at a temperature above <I>T</I> <SUB> <I>g</I> </SUB> of the polymer, structural change of the hollow particles is experimentally observed and theoretically analyzed. The results demonstrate that the change in the surface property of the hollow particles due to the incorporation of the SO<SUB>3</SUB> <SUP>-</SUP> group can have a direct impact on their sealing behavior and surface-sealed structure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sealing behavior of polymer hollow particles with a surface opening was studied. </LI> <LI> The sealing behavior was strongly dependent on the surface property of the particle. </LI> <LI> The surface property affected the structure of the surface-sealed particles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>