층층나무 잎의 Phenol성 성분 (I)

이동호,이승호,정시련,노재섭,이경순,Lee, Dong-Ho,Lee, Seung-Ho,Chung, See-Ryun,Ro, Jai-Seup,Lee, Kyong-Soon 한국생약학회 1995 생약학회지 Vol.26 No.4

Twelve phenolic components were isolated from the aqueous acetone extract of the leaf of Cornus controversa H. (Cornaceae). On the basis of chemical and spectroscopic evidence, the structures of these components were established as gallic acid, $1-O-galloyl-{\beta}-{_D}-glucose$, $1,6-di-O-galloyl-{\beta}-{_D}-glucose$, $1,2,3-tri-O-galloyl-{\beta}-{_D}-glucose$, $1,2,6-tri-O-galloyl-{\beta}-{_D}-glucose$, 3,4,6-tri-O-galloyl ${_D}-glucose$, eugeniin, gemine D, quercetin, quercitrin, hyperoside and rutin.

멀티 세그먼트 곱셈 기반 저비용 타원곡선 암호 프로세서

이동호,LEE Dong-Ho 대한전자공학회 2005 電子工學會論文誌-SD (Semiconductor and devices) Vol.42 No.8

본 논문에서는 효율적인 $GF(2^m)$ 멀티 세그먼트 곱셈 연산 구조를 제안하고 제안된 구조의 타원곡선 암호 프로세서 설계 응용을 연구한다. 제안된 멀티 세그먼트 곱셈 연산 구조는 유한체 크기 m에 비하여 아주 작은 워드 조합 곱셈기를 이용하여 부분곱을 계산하고 거의 모든 내부 버스는 워드 크기이며 m 비트 멀티플렉서와 m 비트 레지스터를 하나만 사용한다. 따라서 조합 곱셈기의 워드 크기 w를 줄이고 세그먼트 수 k를 크게 하여 전체 데이터패스 자원 사용량이 최소화할 수 있다. 제안된 곱셈기는 디지트 시리얼 곱셈기로 구현된 ECC 프로세서와 비교할 때 이론적으로 자원 효율성이 우수하다 암호 프로세서의 자원 사용량은 구현에 필요한 기본 하드웨어 요소 수뿐만 아니라 구성 요소들의 배치와 연결 상태에도 의존한다. 제안된 프로세서의 실질적인 자원사용량을 디지트 시리얼 곱셈기 기반 암호 프로세서와 비교하기 위하여 두 종류의 프로세서를 FPGA 상에 구현하였다. 실험 결과로 제안된 멀티 세그먼트 곱셈기 기반 EU 프로세서는 유사한 성능을 가지는 디지트 시리얼 곱셈기 기반 EU 프로세서보다 자원 사용면에서 2배 정도 우수함을 보였다. In this paper, we propose an efficient $GF(2^m)$ multi-segment multiplier architecture and study its application to elliptic curve cryptography processors. The multi-segment based ECC datapath has a very small combinational multiplier to compute partial products, most of its internal data buses are word-sized, and it has only a single m bit multiplexer and a single m bit register. Hence, the resource requirements of the proposed ECC datapath can be minimized as the segment number increases and word-size is decreased. Hence, as compared to the ECC processor based on digit-serial multiplication, the proposed ECC datapath is more efficient in resource usage. The resource requirement of ECC Processor implementation depends not only on the number of basic hardware components but also on the complexity of interconnection among them. To show the realistic area efficiency of proposed ECC processors, we implemented both the ECC processors based on the proposed multi-segment multiplication and digit serial multiplication and compared their FPGA resource usages. The experimental results show that the Proposed multi-segment multiplication method allows to implement ECC coprocessors, requiring about half of FPGA resources as compared to digit serial multiplication.

플르스틱 제조의 새로운 화학 도구 -메탈로센 촉매라고 불리우는 작은 분자기계가 플라스틱 산업생산에 혁명을 불러 일으키고 있다.

이동호,홍성철,Lee, Dong-ho,Hong, Sung Chul 한국고분자학회 1998 고분자 과학과 기술 Vol.9 No.1

분산제가 BaTiO₃/에폭시 복합체의 유전특성에 미치는 영향

이동호,김병국,제해준,Lee, Dong-Ho,Kim, Byung-Kook,Je, Hae-June 한국재료학회 2009 한국재료학회지 Vol.19 No.11

$BaTiO_3$/epoxy composites have been widely investigated as promising materials for embedded capacitors in printed circuit boards. It is generally known that the dielectric constant (K) of the $BaTiO_3$/epoxy composites increases with improvement of the dispersion of $BaTiO_3$ particles in the epoxy matrix that comes from adding surfactant. The influences of surfactant addition on the dielectric properties of the $BaTiO_3$/epoxy composites are reported in the present study. The dielectric constant of the $BaTiO_3$/epoxy composites is not significantly affected by the surfactant addition. However, the temperature coefficient of capacitance increases and the peel strength decreases as the amount of added surfactant increases. The influences of surfactant addition on the dielectric properties of the neat epoxy are also very similar to those of the $BaTiO_3$/epoxy composites. The residual surfactant in the $BaTiO_3$/epoxy composites affects the temperature coefficient of capacitance and the peel strength of the epoxy matrix, which in turn affects the temperature coefficient of capacitance and the peel strength of the $BaTiO_3$/epoxy composites.

GIS를 이용한 방음벽의 설계풍하중 산정방법

이동호,최세휴,Lee, Dong-Ho,Choi, Se-Hyu 한국공간정보학회 2015 한국공간정보학회지 Vol.23 No.5

최근 국지적 강품 및 태풍에 의한 방음벽의 변형 또는 파괴가 증가하고 있다. 본 연구에서는 1:5,000 수치지형도를 바탕으로 공간정보분석을 이용하여 방음벽의 설계풍하중 산정방법을 제시하였으며 실제 적용사례와 비교분석 하였다. GIS를 이용한 정량적인 평가 결과 건축물이 밀집한 도심지 구간은 지표조도가 III으로, 건물이 상대적으로 적은 교외지역에서는 지표조도가 II로, 개활지와 전형적인 농가밀집 지역은 지표조도가 I로 판정되는 등 실제 지표의 상태를 반영한 방음벽의 풍하중을 산정 할 수 있었다. 본 연구에서 제시한 정량적인 GIS 분석을 방음벽의 내풍설계에 반영한다면, 설계자의 주관에 따라 풍하중이 변화되는 기존의 문제점을 완화하여 보다 합리적인 내풍설계가 이루어 질 수 있을 것으로 판단된다. Recently deformed or destroyed of soundproof wall by local winds and typhoon has increased. This research proposed the estimation method of the design wind load of soundproof wall using spatial information analysis based on 1:5,000 digital map and performed comparative analysis with actual application cases. According to the result of quantitative evaluation using GIS, the surface roughness in the downtown area packed with buildings was III and the surface roughness in the suburban district with a relatively small number of buildings was II and the surface roughness in the district packed with open areas and typical farmhouses was I. This shows that the wind load of the soundproof walls reflecting the actual surface conditions was estimated. If the quantitative GIS analysis presented in this study is applied to wind-resistant design of soundproof walls, it is supposed that this will be helpful in more rational wind-resistant design by remedying the existing problem in which the wind load varies depending on designer's subjectivity.

전기도금 방법으로 제작한 코일을 이용한 초소형 발전기의 특성분석

이동호,김성일,김영환,김용태,박민철,이창우,백창욱,Lee, Dong-Ho,Kim, Seong-Il,Kim, Young-Hwan,Kim, Yong-Tae,Park, Min-Chul,Lee, Chang-Woo,Baek, Chang-Wook 한국마이크로전자및패키징학회 2006 마이크로전자 및 패키징학회지 Vol.13 No.3

We have designed and fabricated micro power generators by electroplating which is important in MEMS(micro electro mechanical system) technique. We have electroplated MEMS coils on the glass substrates and have chosen one of these coils for experiments. The thickness, width, and length of the coil are $7{\mu}m,\;20{\mu}m$, and 1.6 m, respectively. We have analyzed the structure of MEMS coil by SEM. We have made a vibrating system for reproducible results in measurement. With reciprocating a magnet on the surface of a fabricated winding coil, the micro power generator produce an alternating voltage. We have changed the vibrational frequency from 0.5 Hz to 8 Hz. The generated voltage was 106 mV at 3 Hz and 198 mV at 6 Hz. We aim at the micro power generator which can change vibration energy to useful electric energy. 전기도금 방법으로 유리기판 위에 제작한 코일과 영구자석을 이용하여 초소형발전기를 제작하였다. 여러 크기의 코일 구조를 설계한 마스크를 제작하고, 이를 이용하여 MEMS 코일을 제작하였다. 그 중 두께가 $7{\mu}m$ 선폭이 $20{\mu}m$ 길이가 1.6 m인 코일을 선택하여 실험하였다. 광학현미경과 SEM을 사용하여 제작된 코일의 구조를 분석하였다. 또한 모터의 회전운동을 진동운동과 유사한 선형운동으로 변환하는 진동발생시스템을 제작하였고, 자석과 코일을 진동발생장치에 설치하고 진동을 발생시키면 교류 전압이 발생한다. 0.5Hz에서 8Hz까지 진동주파수를 변화시켜 특성을 측정하였다. 발생된 전압은 3Hz에서 106mV가 발생하였고, 6Hz에서 198mV가 발생하였다. 본 연구의 목적은 쓸모없이 버려지는 진동에너지를 유용한 전기에너지로 변환하는 초소형발전기 소자를 제작하는 것이다.

절벽위의 한국의 항공산업

이동호,Lee, Dong Ho 한국항공우주산업진흥협회 1998 航空宇宙 Vol.61 No.-

며칠 전 졸업반 4학년 학생들을 인솔하고 산업체 현장 견학을 다녀왔다. 지난해말 한국을 강습한 IMF 한파 이후 처음 있는 현장 방문이라 여러 가지 면에서 감회가 새로웠다. 일차적으로 김포공항에서 탑승한 부산행 항공기의 현격한 승객 감소가 피부로 와 다았다. 예년 같으면 아침 시간에 좌석배정 카운터가 매우 혼잡할 텐데 별로 힘들지 않게 좌석 배정을 받고 탑승할 수 있었다. 위축된 기업환경과 가계로 인하여 비싼 항공출장과 관광 승객이 대폭 줄은 탓 같았다.

치과용 임플란트 주위 열손 결손에 대한 차폐막의 유도조직재생에 관한 연구

이동호,최상묵,Lee, Dong-Ho,Choi, Sang-Mook 대한치주과학회 1995 Journal of Periodontal & Implant Science Vol.25 No.2

The purpose of this study was to evaluate a new biodegradable membrane - atelocollagen as a guided tissue regeneration barrier on the dehiscence defects adjacent to the dental implants. 3 beagle dogs were selected for this study and all the mandibular premolars($P_1,P_2,P_3&P_4$) were extracted. Twelve weeks after the extraction, the edentulous ridges were formed to be placed the titanium plasma-sprayed IMZ implants. Four implant osteotomies were performed on each side of the mandible. The osteotomies were placed facially in the edentulous ridges to approximate an actual dehiscence defect as closely as possible, The standardized dehiscence defects were created 3 mm in width and 4 mm in height by osteotomy. A total 24 implants were placed. e-PTFE, ateloco11agen and $Collatape^{(R)}$ were placed to cover the defects and the one defect served as a control, not covered any membrane. By random selection, three dogs were sacrificed at 2 weeks, 4weeks and 8 weeks after fixation with 3% glutaraldehyde. A week before sacrificing, 8-week dog was infused intravenously with oxy-tetracycline 30mg/kg. The left mandibular blocks were used for full decalcified histologic preparation and the right mandibular blocks were selected for undeca1cified preparation, At 2 weeks, the regenerated bone of e-PTFE and atelocollagen groups appeared to be more dense than other groups and the percentage of bone defect fill was highest for e-PTFE and follwed by ateloco1lagen group. However, the $Collatape^{(R)}$ and control groups showed a little new bone formation. $Collatape^{(R)}$ was almost degraded within 2 weeks. At 4 weeks, the regenerated new bone were much greater and denser than at 2 weeks for e-PTFE and ateloco11agen group. Although a part of atelocollagen bagan to be degraded at the margin and surrounded by foreign body giant cells related to foreign body reaction, it was generally intact and the regenerated new bone was shown much more than at 2 weeks. The amount of new bone in $Collatape^{(R)}$ and control groups at 4 weeks were similar to that of 2 weeks group. At 8 weeks, the regenerated bone was matured and observed along the implant fixture. Direct new bone formation and calcium deposits beneath the e-PTFE were observed. No further bone growth was seen in the $Collatape^{(R)}$ and control groups. In reflected fluoromicrcocopic observation, the osteogenic activity was pronounced between e-PTFE membrane and the old bone. High osteogenic activity was also observed in atelocol1agen group. This study suggested that the ateloco11agen as well as e-PTFE could be used for guided tissue regeneration on dehiscence defects adjacent to the dental implants. But the $Collatape^{(R)}$ was completely resorbed within 2 weeks and was not a suitable membrane for guided bone regeneration.

Polymerization of ethylene initiated with Cp2ZrCl2 catalyst supported on alkyl - anchored silica

이동호,윤근병 ( Dong Ho Lee,Keun Byoung Yoon ) 한국공업화학회 1996 한국공업화학회 연구논문 초록집 Vol.1994 No.1

폴리이미드의 제조와 성질에 관한 연구 : Ⅳ . 6FDA 계 폴리이미드

이동호,김승환,유태욱,구승영 ( Dong Ho Lee,Seung Hwan Kim,Tae Wook Yoo,Seung Young Koo ) 한국공업화학회 1994 공업화학 Vol.5 No.5

2,2-Bis-(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA), 2,2-bis-[4-(4-aminophenoxy)phenyl]hexafluoropropane 및 4,4-diaminodiphenyl ether 등을 이용하여 단독폴리아믹산, 공폴리아믹산 및 폴리아믹산의 블렌드를 만들고, 열이미드화로 각각의 폴리이미드를 제조하여 구조와 성질을 조사하였다. 그 결과로 열이미드화 동안에 폴리아믹산 간의 교환반응이 일어난다는 것을 알았다. 그리고 공중합이나 폴리아믹산의 블렌드 방법으로 폴리이미드의 분자복합체를 얻을 수 있었다. Using 2,2-Bis-(3,4-dicarboxyphenyl)hexafluoropropane dianhydride, 2,2-bis-[4-(4-aminophenoxy)phenyl]hexafluoropropane and 4,4-diaminodiphenyl ether, the homopolyamic acids, copolyamic acids and blend of homopolyamic acids were prepared and converted to polyimide(PI)s by thermal imidization. In results, it has been found that a exchange reaction of polyamic acids can be occurred during thermal imidization. With measurement of mechanical properties, it was suggested that PI/PI molecular composite can be obtained by copolymerization or physical blending of homopolyamic acids.