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GDI 엔진에서 EGR 적용에 따른 연소 및 배기특성에 관한 연구
김민호(Minho Kim),인병덕(Byungdeok In),이기형(Kihyung Lee) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.5
In a gasoline direct injection engine, the use of MBT (maximum brake-torque timing) is limited in the mid/high load condition because of knocking at high temperatures as the amount of load increases, just as in the case of port fuel injection gasoline engines, and this leads to a reduction of the engine’s thermal efficiency. This study aims to adopt the cooled EGR system to GDI engines for the reduction of pumping loss and NOx.As a gasoline engine controls air volume, it unavoidably involves a higher pumping loss. Pumping loss can be reduced, however, by adopting a cooled EGR system.
SuYeon LIM,Dahwun KIM,SiYan LYU,OuiBo HWANG,ByungDeok KIM,ChaeEun PARK,Ji hoon JEONG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Microneedle (MN) has been desired as a therapeutic device which allow cutaneous administration of various drugs with easily and painlessly. Herein, nano-micelle generating dissolvable MN was designed by a biocompatible amphiphilic tri-block copolymer. When fabricating with doxorubicin (DOX) in the MN, the hydrophobic anticancer drug can be dissolved in an aqueous medium by entrapped in nano-micelles generated by dissolution of the MN. The intratumoral administration of the DOX-encapsulated MN can significantly inhibit the growth of melanoma in a mouse skin cancer model. Furthermore, owing to its small size (< 50 ㎚), the nano-micelle can efficiently migrate to the sentinel lymph nodes, killing the metastatic skin cancer cells. Therefore, the use of locally application of MN can be considered as a promising therapeutic device for the inhibition of metastatic melanoma.
캐비티 공진기를 이용한 반고체 상태 물질의 복소 비유전율 측정 방법
박래승(Rae-Seoung Park),장지현(Jihyun Jang),박병덕(Byungdeok Park),김준환(Junhwan Kim),박상복(Sangbok Park),정용식(Young-Seek Chung),천창율(Changyul Cheon) 한국전자파학회 2014 한국전자파학회논문지 Vol.25 No.8
본 논문은 새로운 캐비티 공진기 구조를 이용한 반고체 상태 물질의 복소 비유전율 측정 방법을 제안하고 있다. 윗면에 개구면이 존재하고, Ground 판이 분리되어 있는 구조를 이용하여 반고체 상태 물질도 캐비티 내부에 위치할 수 있도록 했다. 공진주파수의 변화와 Critical-Points Method를 이용해 실험적으로 증류수와 0.9 % 식염수의 복소 비유전율을 측정하였으며, 측정값을 Cole-Cole Equation을 통해 이론값과 비교했다. This paper proposes a measurement method of the complex relative permittivity of semi-solid materials using a new cavity structure. Semi-solid materials are positioned in the proposed cavity where an aperture exists on each corner of the upper part and a ground plane is separated. In order to show the validation of the proposed method, we measured the complex relative permittivity of distilled water and 0.9 % saline by sensing a shift of resonant frequency and using Critical-Points Method, and compared the results with those derived from the Cole-Cole equation.