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21 W LED 엔진을 이용한 150 W급 가로등의 최적설계
신왕수,이승민,김범수,박대희,Shin, Wang-Soo,Lee, Seung-Min,Kim, Beom-Su,Park, Dae-Hee 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.1
In this paper, the IES file was measured by applying a secondary optical lens to a 21 W LED engine, and the lighting calculation software RELUX was used to perform simulations with the data file of this measurement. For two-lane (two way) concrete paved roads, six LED engine are applied to each streetlight and simulation results show that Uo (uniformity) 0.56, UI (longitudinal uniformity) 0.86 and TI (threshold iIncrement) 9% which satisfies the required standards. RELUX was also used to LED streetlights by designing them in three dimensions, that is ${\pm}25%$ of the arm length of 2.8 m standardized by the road lighting standards of the Korea Expressway Corporation. Comparative analysis was carried out on adjustments were made in increments of 0.1 m that Uo, UI, and TI values in the range of arm lengths from 2.1 m~3.5 m. For the arm length range of 2.1 m~2.4 m, Uo was high, whereas UI was low. Therefore, we present the optimal light distribution values designed for an arm length of 2.5 m.
신왕수,이승민,권영국,이진열,박대희,Shin, Wang-Soo,Lee, Seung-Min,Gwon, Young-Guk,Lee, Jin-Youle,Park, Dae-Hee 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.6
Road lighting has emerged in importance as an essential system to secure safety and visibility for drivers and pedestrians. According to the Road Lighting Standards (KS A 3701), the luminance uniformity (U0) should be 0.4, the luminance uniformity for lanes (UI) should be 0.5, and a threshold increment (TI) of 10% should be satisfied. In this study, we conducted simulations using the Relux program in which the secondary optical lens was applied to a 21 W engine. Ten LED engines were installed on a two-way four-lane road, and the simulation result satisfied the requirements with U0 0.47, UI 0.63 and TI 8%. The U0, UI, and TI were compared with the angle of the LED streetlight varied in the range of $9^{\circ}{\sim}15^{\circ}$ with $0.5^{\circ}$ intervals. The range was selected as ${\pm}25%$ of the standard inclination angle of $12^{\circ}$ according to the Road Lighting Standard. The U0 was high and the UI and TI were low when the tilting angle was in the range of $9.5^{\circ}{\sim}10.5^{\circ}$. Consequently, an optimum-design of lighting distribution was obtained for the concrete two-way four-lane road when the inclination angle was $9^{\circ}$.
쾌속조형기법을 이용한 생분해성 스텐트용 메쉬필름의 약물방출거동 효과
정신영(Sin Young Cheong),김양은(Yang Eun Kim),고영주(Young Joo Koh),신왕수(Wang Soo Shin),이준희(Jun Hee Lee),김완두(Wan Doo Kim),유영은(Young Eun Yoo),박수아(Su A Park) 한국고분자학회 2014 폴리머 Vol.38 No.1
약물방출 고분자 코팅 스텐트는 수술후 재협착을 획기적으로 줄였지만, 약물방출이 균일한 구조체를 제작하는 것이 어렵고 체내에 구조체를 영구적으로 남겨야 하는 부담을 여전히 가지고 있다. 이를 해결하는 방안으로 생분해성 고분자로 스텐트를 제작하는 방법들이 활발하게 연구되고 있다. 본 연구에서는 조형가공기술(solid freeformfabrication, SFF)의 하나인 쾌속조형기법(rapid prototyping technique)의 3차원 플로팅(3D plotting) 기술을 이용하여파크리탁셀(PTX) 약물을 함유한 폴리카프로락톤(PCL) 3차원 구조체를 제작하였고, 생분해성 PCL 고분자로부터PTX의 방출거동과 스텐트 제작 가능성을 고찰하였다. 약물을 포함한 구조체의 표면특성을 SEM으로 확인한 결과굴곡이 자연스럽고 매끄러운 표면을 가지고 있었다. FTIR을 통해서 약물이 성공적으로 구조체에 포함되었음을 확인하였고, NMR과 HPLC를 통해서 PCL 구조체 중의 PCL함량과 PTX의 서서히 방출됨을 확인되었다. 또한 세포실험을 통해 구조체에서 방출된 약물이 생물학적으로 활성을 유지하고 있으며, 반복제작된 구조체에서도 균일한 활성의 약물이 방출됨을 확인하였다. 이와 같은 쾌속조형기법을 이용하여 약물을 포함하는 구조체를 제작하고 분석함으로써, 생분해성 고분자 스텐트로서의 적용가능성을 제시하였다. Biodegradable drug-eluting stent has dual functions of supporting the lumen and treating internal tumor preventingthe restenosis by releasing drug. In this study, the polycaprolactone (PCL) based three dimensional (3D) meshloaded with paclitaxel (PTX) was presented by rapid prototyping (RP) technique of solid freeform fabrication (SFF) forbiodegradable drug-eluting stent application. PCL has many advantageous properties such as good biocompatibility, goodmechanical properties, and good drug permeability. PTX is widely used in the cancer treatment by inhibiting tumor cellproliferation. Analytical methods of HPLC and NMR were used for simultaneous quantification of PTX. Scanning electronmicroscopy (SEM) was performed to observe the architecture and morphologies of 3D mesh. The cytotoxicity assayresults indicated released PTX`s biological activity. This study provided that PCL based 3D mesh loaded with PTX byRP technique has great potential for biodegradable drug-eluting stent application.