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Construction of an Efficient Overlay Multicast for Multi-layer
Bumjae Lee,Kangwhan Lee 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
As the MANET is becoming more noticed as a flexible and non-infrastructure network, routing algorism of the MANET is becoming an important issue. Especially, in the mobile Ad hoc, the method of the management of each Node is recognized as an important part of the next generation network from now on. In this paper used that Overlay Multicast Routing Algorism operates flexibly according to the various limited condition and environment of the MANET. Because of this Algorism have maintenance and transmission of the network to used virtual Overlay ID. But the existing Overlay Multicast applies only to Cluster made up single layer. And Clustering and maintenance of the cluster does not treat energy property. So, in this paper proposed Efficient Overlay Multicast for Multilayer(EOMM) is clustering consider residual energy of the node in the based multi-layer. And it has efficient overlay ID generation of the Node for the life time and the advantage of the Multi-layer is maintenance of nodes. Then more it provide faster operation in routing through Masking overlay ID in each layer. Our algorism reduces routing delay and more efficient Packet ratio and life time.
폴리카르복실레이트계 수용성 삼원공중합체의 합성 및 고품질시멘트용 고성능 가소제로의 적용
이범재,Wang, Meicong,Yan, Feng 충남대학교 산업기술연구소 2002 산업기술연구논문집 Vol.17 No.1
폴리카르복실레이트를 중심으로 황산염기와 폴리에틸렌옥사이드(PEO) 측쇄를 포함하는 다양한 조성을 가지는 수용성 아크릴형태 공중합체를 합성하여 고성능 시멘트에서 사용되는 특수분산제형 가소제로서의 성능을 연구하였다. 본 연구에서는 삼원공중합체의 자유라디칼 종합에서 분자량 및 함유된 이온의 조성 조절방법과 함께 고분자 구조에 따른 시멘트 페이스트의 유동성에 미치는 효과를 연구하였다. 연구 결과, sodium allyl sulfonate(SAS-Na)을 포함하는 공중합체에서 낮은 분자량을 나타내었으며, 삼원 단량체 중에서 methacrylic acid sodium salt(MAA-Na), SAS-Na, poly(ethylene glycol)methylethermethacrylate(MA-PEG)순으로 반응성이 커서 공중합체에 단량체 주입비보다 많이 함유되었다. 시멘트 유동화제로서의 성능에서 크기가 긴 PEO 가지를 가진 삼원공중합체가 황산염기와 카르복실레이트 이온기만을 가진 공중합체보다 시멘트의 유동성 유지에 더욱 큰 효과를 나타내었다. 즉 이러한 삼원 공중합체를 사용한 시멘트의 슬럼프 시험 결과 시간에 따라 유동성 감소가 적었으며, 낮은점도를 가져 고성능 시멘트용 유동화제로서 우수한 성능을 나타내었다.
기능통합 드라이브 액슬 적용을 통한 한계 코너링 성능 향상
이수경(Sookyoung Lee),이범재(Bumjae Lee),김희준(Heejoon Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
By applying Integrated Drive Axle into a vehicle, even though the camber stiffness is increased, the unsprung mass can be reduced. In this study, we investigate how the extreme cornering performance such as circuit driving is improved by the Integrated Drive Axle.
유한요소해석을 이용한 허브 베어링 압입을 위한 부품의 상대공차 설정에 관한 연구
강종수(Jongsoo Kang),이동석(Dongseok Lee),이범재(Bumjae Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
The plastic zone of knuckle hole inner surface was occurred by inserting hub bearing into knuckle. Finite element analysis was performed on tolerance establishment of knuckle and hub bearing. As a result, the optimized tolerance condition was established considering the stress distribution of knuckle and hub bearing. And, analysis of knuckle hole inner surface verified the effect of insertion. Insertion force and separation force curve was derived from test equipment The possibility of design tolerance establishment was identified by the insertion analysis using the finite element analysis.
Jin-Seok Bae,Jihye Bae,Heeju Woo,Bumjae Lee,Euigyung Jeong 한국탄소학회 2018 Carbon Letters Vol.25 No.-
This study suggests the novel thermoplastic toughening agent, which can be applied in the monomer forms without increasing the viscosity of the epoxy resin and polymerized during the resin curing. The diazide (p-BAB) and dialkyne (SPB) compounds are synthesized and mixed with the epoxy resin and the carbon fiber reinforced epoxy composites are prepared using vacuum infusion process (VIP). Then, flexural and drop weight tests are performed to evaluate the improvement in the toughness of the prepared composites to investigate the potential of the novel toughening agent. When 10 phr of p-BAB and SPB is added, the flexural properties are improved, maintaining the modulus as well as the toughness is improved. Even with a small amount of polytriazolesulfone polymerized, due to the filtering effect of the solid SPB by the layered carbon fabrics during the VIP, the toughening and strengthening effect were observed from the novel toughening agent, which could be added in monomer forms, p-BAB and SPB. This suggests that the novel toughening agent has a potential to be used for the composites prepared from viscosity sensitive process, such as resin transfer molding and VIP.