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유현우,카티 라주,박지연,윤당혁,Yu, Hyun-Woo,Raju, Kati,Park, Ji Yeon,Yoon, Dang-Hyok 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
The sintering behavior of monolithic SiC is examined using the binary sintering additive of $Al_2O_3$-rare earth oxide ($RE_2O_3$, where RE = Sc, Nd, Dy, Ho, or Yb). Through hot pressing at 20 MPa and $1750^{\circ}C$ for 1 h in an Ar atmosphere for 52 nm fine ${\beta}$-SiC powder added with 5 wt% sintering additive, a SiC density of > 97% is achieved, which indicates the effectiveness of $Al_2O_3-RE_2O_3$ system as a sintering of additive for SiC. Based on this result, 7 wt% of $Al_2O_3-Sc_2O_3$ is tested as an additive system for the fabrication of a continuous SiC fiber-reinforced SiC-matrix composite ($SiC_f$/SiC). Electrophoretic deposition combined with the application of ultrasonic pulses is used to efficiently infiltrate the matrix phase into the voids of $Tyranno^{TM}$-SA3 fabric. After hot pressing, a composite density of > 97% is obtained, along with a maximum flexural strength of 443 MPa.
SoC 환경에서 RTOS와 멀티미디어 OS 동시 운영을 위한 설계 방법론
유현우(Ryu, Hyun Woo),유한상(Yu, Han Sang),이진우(Lee, Jin Woo),차재오(Cha, Jae Oh),이종근(Lee, Jong Keun) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Currently, researches on the development of an integrated ECU environment are being actively carried out by configuring a function having various requirements in a single SOC (System On Chip) in the change of automobile software. If the solution is not essential to the customer"s requirements, the hypervisor will not be able to function without access to the CPU core. This paper proposes a development methodology for operating a stable multi OS under these conditions
유현우(Hyun Woo Yu),이치훈(Chi Hoon Lee),고종수(Jong Soo Ko),신보성(Bosung Shin),노치현(Chi-Hyun Rho) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.5
A new polymer replication technology using ultrasonic vibration is proposed and demonstrated. A commercial ultrasonic welder has been used in this experiment. Two different types of nickel molds have been fabricated: pillar type and pore type microstructures. Polymethyl methacrlylate (PMMA) has been used as the replication material and the optimal molding time was 2 sec and 2.5 sec for pillar-type and pore-type micromolds, respectively. Compared with the conventional polymer micromolding techniques, the proposed ultrasonic micromolding technique has the shortest processing time. In addition, only contact area between micromold and polymer substrate is melted so that the thermal shrinkage can be minimized. The fabricated PMMA microstructures have been very accurately replicated without vacuum. The proposed ultrasonic molding technique is a good alternative for high volume production.
초음파성형을 이용한 폴리에틸렌 나노 마이크로 구조물의 복제
이치훈(Chi Hoon Lee),유현우(Hyun Woo Yu),신보성(Bosung Shin),고종수(Jong Soo Ko) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.11
Nano-micro hierarchical structures that nanoprotrusions were formed on the network-type microstructures were fabricated using an ultrasonic vibration forming technology. A commercial ultrasonic welding system was used to apply ultrasonic vibration energy. To evaluate the formability of ultrasonic vibration forming, nickel nano-micro hierarchical mold was fabricated and polyethylene (PE) was used as the replication material. The optimal molding time was 3.5 sec for PE nano-micro hierarchical structures. The molding process was conducted at atmospheric pressure.