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Bloom Filter를 이용한 AODV 라우팅 성능 향상 방안
김학원,김광수,윤병성,노병희 한국차세대컴퓨팅학회 2014 한국차세대컴퓨팅학회 논문지 Vol.10 No.3
AODV는 이동애드혹망 (mobile ad-hoc network, MANET)을 위한 대표적인 라우팅 프로토콜중의 하나이며, 이를 보다 최적화된 성능 개선을 위해 다양한 방법들이 제안되어 왔다. 그러나 AODV의 알고리즘이 가지고 있는 본질적인 특성으로 인한 데이터 패킷 전송 지연을 해결할 수 있는 방안은 부족한 상태이다. 본 논문에서 우리는 AODV의 경로 복구 동안 데이터 패킷 전송지연 감소를 위해 Bloom Filter (BF) 를 적용하는 하이브리드 방식을 제안한다. AODV가 가지고 있는 요구기반 경로탐색 및 경로복구 방법의 장점을 살리면서 BF를 이용하여 데이터 패킷 전송 지연을 감소하는 방법을 도입하였다. 아울러 위치정보와 목적지노드 방향 ‘2-홉 노드’ 정보를 사용하여 BF의 정확성을 높일 수 있는 방법을 제안하였다. 제안된 방법을 적용 시 AODV의 망토폴로지 변화에 대한 적응성을 살리면서 동시에 데이터 전송 성능을 개선시킬 수 있다.
킬레이트리간드가 장착된 광변환가능 유기화합물의 합성에 관한 연구
김학원,박윤석,김홍두,박광현 경희대학교 산학협력기술연구원 2001 산학협력기술연구논문집 Vol.7 No.-
The synthetic studies of the photoswitchable organic compounds including a potent chelate ligand have been described. These potent photoswitchable chelators could be divided structurally into the two parts. One is the crown-ether type part for a metal chelation and another is the bi-cinnamoyl part for a phototransformation. Several bicinnamoyl derivatives have been synthesized to be further studied and developed for the recyclizable metal chelator.
항암물질 Flavone-8-aceticAcid의 새로운 유도체 합성에 관한 연구
김학원,김지한 慶熙大學校 材料科學技術硏究所 1995 材料科學技術硏究論集 Vol.8 No.-
This work describes studies aimed at the syntheses of new analogs of anti-cancer agent. flavono 8-acetic acid(7. FAA). C-3-Hydroxy FAA derivative 9 was prepared from methyl ester of FAA. 11 by DMDO-epoxidation and subsequent rearrangement. Especially, epoxidation by isolated DMDO(as acetone solution) gave labile epoxides 12 and 13 which were identified by NMR Synthesis of C-4 thioketo FAA derivative 10 has been complete from FAA ester 11 with Lawesson's reagent.
라디칼반응과 Pd 촉매반응을 이용한 Aryl Halides의 분자내 고리화 반응에 관한 연구
김학원,이은경,윤병훈 慶熙大學校 材料科學技術硏究所 1996 材料科學技術硏究論集 Vol.9 No.-
The intramolecular radical and palladium catalyzed cyclizations of the aryl halides produced the corresponding heterocyclic compounds. The intramolecular radical cyclization of our precursors was more efficient than the palladium-catalyzed one.
MOM-Br를 이용한 2,2'-Methylenebis(1,3-cyclohexanedione) 유도체의 합성
김학원 慶熙大學校 1995 論文集 Vol.24 No.-
The reaction of 1,3-cyclohexanedione derivatives (e.g. compound, 1) with base and bromomethyl methyl ether(MOM-Br) gave two products which are C- and O-alkylated products, 2 and 3. Interestingly, C-alkylated one is not simple C-MOM compound but methylene-bridged dimer 2 which have been identified as 2,2'-methylenebis (1,3-cyclohexanedione) derivatives. The ratio of O- and C-alkylation is dependent on several conditions which are concentration, solvent, temperature, base etc. The reaction of cyclohexanedione derivatives with MOM-Br and NaH in THF gave a corresponding methylene-bridged dimer in a satisfactory yield. The resulting methylene-bridged dimers 2 might be potent synthetic intermediates for natural products.
10-단일치환된 Anthrone으로부터 9-치환된 Anthracene 유도체의 합성
김학원,홍수동,윤병훈,김지한 경희대학교 환경연구소 1997 環境硏究 論文集 Vol.7 No.-
Direct syntheses of 9-(3-propenyl)anthracene(l0) and 9-(3-ethoxy-3-oxopropyl) anthracene(l3) were reported. 9-(3-Propenyl)anthracene(l0) was prepared from the NaBH_(4) reduction of 10-(3-propenyl)anthrone(7). Also, 9-(3-ethoxy-3-oxopropyl)anthracene(13) was prepared from the NaBH_(4) reduction and the subsequent P_(2)O_(5) dehydration of l0-(3-ethoxy-3-oxopropyl) anthone(l1)
항생물질 Tetracycline의 유도체 합성에 관한 연구
김학원 慶熙大學校 材料科學技術硏究所 1994 材料科學技術硏究論集 Vol.7 No.-
This work describes studies aimed at the synthesis of analogs of antibiotic tetracycline. Tetracyclines are a family of broad spectrum antibiotics which have a common perhydronaphthalene skeleton. They have a wide spectrum of antibiotic activity and also chelate various metal ions to form complexes. The synthesis of possible metal complexing analogs of tetracycline have been complete from readily available compound 6. The starting material 6 was transformed to the aldehyde intermediate from selective methylation. O-allylation, Claisen rearrangement. olefine isomerization, and ozonolysis. The aldehyde intermediate 11 was converted to the several final compounds by the formation of ketoester intermediate and the selective C-acetylation followed by deprotection or methyl ether. Deprotection gave the unexpected compounds which have a flavonide-like structure.