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이동통신 시스템을 위한 사다리형 표면탄성파 필터의 구현
李澤周,정덕진 대한전자공학회 2003 電子工學會論文誌-SD (Semiconductor and devices) Vol.40 No.3
In this paper, we designed a highly suppressed sidelobe ladder type RF SAW bandpass filter based on 1-port resonator, for 800 MHz mobile communication system. In order to get the highest device characteristics, we optimized some important parameters such as the electrode thickness, electrode lambda weighting of the reflectors, and static capacitance ratio. Furthermore, we fabricated the Tx. and Rx. filter using optimized parameters. Implemented filters can be used in 800 MHz mobile communication system and external impedance matching circuits are not needed. RF filter was fabricated on 36 LiTaO3 substrates with Al-Cu (W 3 %) and mounted 3.8㎜ 3.8㎜ 1.5㎜ SMD package. Developed filters has 2.3 dB insertion loss in the 25 MHz pass-band, 33 MHz with 3-dB insertion loss, stop-band rejection of 30 dB, passband ripple is less than 0.5. The power durability of the filters measured about 3.5W and the maximum temperature variation within -20 ∼80 was 0.09 dB/ of 3-dB insertion loss. 본 연구에서는 1-단자 표면탄성파 공진기를 적용한 사다리형 구조 필터에 대한 전극 두께, 공진기의 반사기 하중 및 정적 정전용량비에 따른 주파수 응답특성의 고찰이 이루어졌으며, 최적화된 매개변수를 이용하여 송신 및 수신단용 RF 필터를 제작하였다. 제작된 필터는 800 MHz 대역 이동통신 시스템에 적용 가능하며, 외부회로에 의한 임피던스 정합이 필요하지 않다. 36 LiTaO3 압전기판 위에 Al-Cu(W 3 %) 전극을 형성하여 제작하였으며, 3.8㎜ 3.8㎜ 1.5㎜ 세라믹 패키지에 실장되었다. 통과대역(25 MHz)에서의 최소 삽입손실은 2.3 dB, 3-dB 대역폭은 약 33 MHz, 통과대역 리플은 0.5 dB 미만이며, 약 30 dB 이상의 저지대역 감쇄를 확보할 수 있었다. 또한, 제작된 RF 필터의 내전력성 및 온도 변화에 따른 주파수 응답특성 실험을 통해 약 3.5 W의 내전력성과 -20 ∼80 에서 최대 0.09 dB/ 의 3-dB 삽입손실 변화를 측정할 수 있었다.
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徐富甲,李元暢,李澤柱 서울市立大學校 1982 論文集 Vol.16 No.-
The effect of ginseng extract on in vitro multiplication of anaerobic bacteria was studied and the following results were obtained; 1. The growth of B. fragilis, B. thetaiotamicron and C. perfringens was slightly promoted at 0.1% concentration of the extract, while a marked growth was observed at 1.0% concentration of the extract. 2. Multiplication of Pc. asaccharolyticus and Ps. amaerobius were slightly inhibited at 0.1% concentration of the extracts whereas complete inhibition was observed at 1.0% concentration. The growth of C. difficile was also slightly inhibited at 1.0% concentration. 3. No effect of the ginseng extracts on the growth of Pc. magnus, Pc. prevotti and V. parvwla was observed. A marked growthe of B. fragilis and B. thetaiotamicron at 1.0% concentration of ginseng extract may have the influence on bacterial infection in the host animal however, further in vivo studies deem necessary.
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123°LiNbO<sub>3</sub> 기판을 이용한 기울인 빗살변환기 구조의 70MHz IF 필터 구현
이택주,정덕진 한국전기전자재료학회 2002 전기전자재료학회논문지 Vol.15 No.4
In this paper, surface acoustic wave(SAW) bandpass filters using slanted finger interdigital electrode transducers(IDTs) are investigated. The slanted finger IDTs are used to design SAW filters with good shape factor, a flat passband, and good out-of-band rejection characteristic. For the filter design, input-output IDT structure was simulated with modified impulse model; uniform-withdrawal weighting IDTs, withdrawal-withdrawal weighting IDTs. SAW filters of uniform-withdrawal weighting IDTs structure were designed and fabricated on $128^{\circ}LiNbO_3$ piezoelectric substrates. Implemented SAW filter has a fractional bandwidth of 30%, center frequency of 70MHz and shape factor of $1.12\pm0.01$.
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金東源,李敏雄,李澤柱 동국대학교 자연과학연구소 1987 자연과학연구 논문집 Vol.7 No.-
人蔘엑기스가 微生物 發育에 미치는 影響을 調査하기 위해Erwinia carotovora, Staphylococcus aureus, Escherichia coli, Salmonella spp, Shigella spp와 같은 여러가지 菌株를 使用하여 人蔘엑기스의 添加濃度와 一定時間別로 細菌의 生長發育狀態를 調査하여 다음과 같은 結果를 얻었다. 1. Erwina carotovora는 人蔘엑기스가 1% 添加된 群에서 24時間까지 持續的인 增殖을 보였으나, 1%미만의 人蔘엑기스 添加群에서는 培養 18時間後에는 增殖이 靜止된 狀態를 나타냈다. 2. Staphylocococcus aureus는 人蔘엑기스의 添加量이 增加함에 따라 24時間까지 持續的으로 菌의增殖이 促進되었다. 3. Escherichia coli는 人蔘엑기스 添加濃度 1%群에서 현저히 增殖되었으나, 1%미만의 人蔘엑기스 添加群은 대조군과 비슷한 증식을 보였다. 4. Salmonella paratyphi A와 Salmonella paratyphi C및 Salmonella typhi는 人蔘엑기스 添加群添加群에서 다소 增殖이 增加되었고, Salmonella paratyphi B는 1% 人蔘인삼엑기스 添加群에서 24時間까지 持續的으로 현저한 增殖의 促進을 보였다. 5. Shigella boydii 와 Shigella flexneri 및 Shigella sonnei는 人蔘엑기스의 濃度나 時間에 많은 影響을 받지 않았으나, Shigella dysentriae는 1% 人蔘엑기스 添加群에서 24시간까지 持續的으로 현저한 增殖의 促進을 보였으며, 0.1% 人蔘엑기스添加群에서는 모두 억제되었다. 6. 嫌氣性細菌에서 Peptococcus magnus와 Peptostreptococcus anaerobius는 人蔘엑기스 添加群에서 細菌增殖이 낮았고 Clostridium perfingens는 고농도 人蔘엑기스 添加群에서 增殖이 增加한 반면, Clostridium difficile은 低濃度 人蔘엑기스 添加群에서 增殖의 促進을 보였으며, Bacteroides fragilis는 人蔘엑기스 添加群에서 增殖의 低下를 보였으나, Bacteroides thetaiotaomicron은 人蔘엑기스 添加群에서 增殖이 促進되었다. The present study was carried out to look at the effect of different concentration of added ginseng (pnax ginseng C.A. Meyer) extract on the growth of microorganism such as Erwinia carotovora, Staghylococcus, Escherichia coli, Salmonella spp, Shigella spp, Pepeptostreptococcus anaerobius, Clostridium perfringens, C. difficile, Bacteroides fragilis and B. thetaiotaomicron. 1. Erwinia carotovora on 1% ginseng extract showed a continuous proliferation during 24 hrs while that on less than 1% ginseing extract showed a suspended growth state after 18 hrs. 2. Straphylococcus aureus promoted continuously until 24hrs according to increase of added ginseng extract. 3. Escherichia coli promoted tis proliferation in ginseng extract group of 1%, but was similar to control group in ginseng extract group under 1%. 4. Salmonella typhi, S. paratyphi A and S. phratyphi C were somewhat increased group added ginseng extract and S. paratyphi B showed markedly durable proliferation from 1 to 24 hrs in ginseng extract group of 1%. 5. Shigella boydii, S. flexneri and S. sonnei were not nearly influen concentartion of ginseng extract and regular times, but S. dysentriae promoted-remarkable proliferation from 1 to 24 hrs in ginseng extract group of 1%. They were all inhibition in ginseng extract group of 0.1%. 6. peptococcus magnus and peptostreptococcus anaerobius showed a decreased proliferation in added ginseng group and Clostridium perfrigens showed a increased proliferation in high concentraction of added ginseng group. C. difficile showed a increased proliferation in low concentration of added ginseng group and Bacteroides fragilis showed a decreased proliferation in added ginseng group. B. thetaiotaomicron was promoted in added ginseng group according to increase of added amount of ginseng extract.
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