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국내육성 오차드그라스 품종들의 캘러스 형성율 및 식물체 재분화 효율
김기용,강경민,배은경,이인애,임용우,최기준,박근제,손대영,조진기 Plant molecular biology and biotechnology research 2003 Plant molecular biology and biotechnology research Vol.2003 No.-
Comparisons of callus formation ratios from seed explants, callus sizes, regeneration ratios from callus and regeneration efficiency for 4 orchardgrass (Dactylis glomerata L.) varieties (Three were developed in Korea and one was imported from foreign nation) are as follows; Jangbeol 102 (67.0%) has the highest callus formation ratio in 4 weeks incubated callus after bedding the seed explants, but Potomac (68.4%) has the highest ratio in 6-seek callus. Potomac (3.93cm) has the highest callus size in 4-week callus, but Jangbeol 101 (4.32cm) has the highest size in 6-week callus. Jangbeol 101 (17.7%) has the highest plant regeneration ratio in 4-week callus, but Potomac (37.4%) has the highest raion in 6-week callus. Jangbeol 102 (11.5%) has the highest plant regeneration efficiency in 4-week callus, but Potomac (25.6%) has the highest efficiency in 6-week callus.
Jun-Gi Jo,Jong-Ho Lee,Dojin Park,Young Gun Pu,Sung-Cheol Shin,Kang-Yoon Lee,Sung-Eon Park,Suk-Joong Lee,Changsik Yoo IEEE 2009 IEEE transactions on microwave theory and techniqu Vol.57 No.4
<P>A dual-mode RF receiver with low-IF architecture has been developed for <I>L</I>1-band Global Positioning System (GPS) and Galileo system in a 0.18- mum CMOS process. The channel-selecting bandpass filter centered at 4.092 MHz has programmable bandwidth (2.046 MHz, 4.092 MHz), which allows the reception of GPS and Galileo signals. A fractional-N phase-locked loop generates the local oscillator signals, which allows multiple reference clock frequencies, and in turn, share of a reference oscillator with other systems. The noise figure of the receiver is 4.5 dB, while consuming 41.4 mW from a 1.8-V supply. The image signal is rejected by more than 34 dB.</P>
dB-선형적 특성을 가진 GPS 수신기를 위한 CMOS 가변 이득 증폭기
조준기(Jun-Gi Jo),유창석(Changsik Yoo) 大韓電子工學會 2011 電子工學會論文誌-SD (Semiconductor and devices) Vol.48 No.7
본 논문에서는 GPS 수신기를 위한 dB-선형 특성이 개선된 가변 이득 증폭기 회로를 제안한다. 제안된 dB-선형 전류 발생기는 dB-선형성 오차가 ±0.15dB 이내로 개선되었다. 개선된 dB-선형 전류 발생기를 사용하여 GPS 수신기를 위한 가변 이득증폭기를 설계였다. GPS 수신기의 IF 주파수는 4MHz를 가정하였고, 선형성 요구조건을 도출하여 만족하기 위해 최소 이득일 때 24dBm의 IIP3를 만족하도록 하였다. 가변이득 증폭기는 3단으로 구성되어 있으며 DC-오프셋 제거 루프를 통하여 회로의 오프셋 전압을 보상하였다. 설계된 가변 이득 증폭기의 이득은 -8dB~52dB의 범위를 가지며 이득의 dB-선형성은 ±0.2dB 이내를 충족한다. 3-dB 주파수 대역폭은 이득에 따라 35MHz∼106MHz를 보인다. 가변 이득 증폭기는 CMOS 0.18μm 공정을 이 용하여 설계되었으며 전력은 1.8V 전원 전압에서 3mW를 소비한다. A dB-linearity improved variable gain amplifier (VGA) for GPS receiver is presented. The Proposed dB-linear current generator has improved dB-linearity error of ±0.15dB. The VGA for GPS is designed using proposed dB-linear current generator and composed of 3 stage amplifiers. The IF frequency is assumed as 4MHz and the linearity requirement of the VGA for GPS receiver is defined as 24dBm of IIP3 using cascaded IIP3 equation and the VGA satisfies 24dBm when minimum gain mode. The DC-offset voltage is eliminated using DC-offset cancelation loop. The gain range is from -8dB to 52dB and the dB-linearity error satisfies ±0.2dB. The 3-dB frequency has range of 35MHz∼106MHz for the gain range. The VGA is designed using 0.18μm CMOS process. The power consumption is 3mW with 1.8V supply voltage.
간암 환자에서 발생한 위장관 운동장애 및 소장내 세균과증식
이은희 ( Lee Eun Hui ),이광재 ( Lee Gwang Jae ),김도현 ( Kim Do Hyeon ),송현주 ( Song Hyeon Ju ),최준혁 ( Choe Jun Hyeog ),송영준 ( Song Yeong Jun ),김진홍 ( Kim Jin Hong ),조성원 ( Jo Seong Won ),윤준기 ( Yun Jun Gi ) 대한소화기기능성질환·운동학회 2003 Journal of Neurogastroenterology and Motility (JNM Vol.9 No.2
Gastrointestinal (GI) symptoms such as nausea, vomiting, abdominal pain, and diarrhea are common in patients with advanced liver disease. Changes of the GI function can be caused by malabsorption, GI motility disturbances, small intestinal bacterial overg
디지털 입력 시그마-델타 변조 기반의 D급 오디오 증폭기
조준기(Jun-Gi Jo),노진호(Jinho Noh),정태성(Tae-seong Jeong),유창식(Changsik Yoo) 大韓電子工學會 2010 電子工學會論文誌-SD (Semiconductor and devices) Vol.47 No.11
본 논문에서는 시그마-델타 변조기에 기반 한 D급 오디오 증폭기를 제안한다. 16-비트 병렬의 디지털 입력신호는 4-차 디지털 시그마-델타 변조기에 의해 2-비트의 신호로 직렬화되고, 이 신호는 4-차 아날로그 시그마-델타 변조기로 인가된다. 아날로그 시그마 델타 변조기의 출력단의 파워 스위치는 3-레벨로 동작하며, 3-레벨의 펄스 밀도 변조(PDM) 출력 신호는 LC-필터를 통해 저역 통과되어 스피커에 전달된다. 아날로그 시그마-델타 변조기의 첫 단의 적분기는 디지털 시그마-델타 변조기의 출력으로부터 샘플된 이산 시간 영역의 신호를 입력으로 받아들이고, 동시에 파워 스위칭 단의 연속 시간 영역의 출력 신호를 부궤환(feedback) 받기 위해 스위치드-캐패시터 적분기와 연속시간 영역의 적분기를 혼합된 형태로 구현되었다. 제안된 클래스-D 오디오증폭기는 CMOS 0.13-㎛ 공정을 이용해 제작되었으며 100-㎐ 부터 20-㎑의 신호 주파수 영역에서 동작한다. 제작된 D급 오디오 증폭기는 4-Ω 부하 저항에서 최대 18.3-㎽을 내고 0.035-%의 전고조파 왜율(total harmonic distortion pluse noise : THD+N) 성분과 80-㏈의 입력신호 대역폭(dynamic range)을 갖는다. 아날로그 및 디지털 변조기는 1.2-V 전원 전압으로 동작하며 총 457-uW의 전력을 소모한다. A sigma-delta modulator based class-D audio amplifier is presented. Parallel digital input is serialized to two-bit output by a fourth-order digital sigma-delta noise shaper. The output of the digital sigma-delta noise shaper is applied to a fourth-order analog sigma-delta modulator whose three-level output drives power switches. The pulse density modulated (PDM) output of the power switches is low-pass filtered by an LC-filter. The PDM output of the power switches is fed back to the input of the analog sigma-delta modulator. The first integrator of the analog sigma-delta modulator is a hybrid of continuous-time (CT) and switched-capacitor (SC) integrator. While the sampled input is applied to SC path, the continuous-time feedback signal is applied to CT path to suppress the noise of the PDM output. The class-D audio amplifier is fabricated in a standard 0.13-㎛ CMOS process and operates for the signal bandwidth from 100-㎐ to 20-㎑. With 4-Ω load, the maximum output power is 18.3-㎽. The total harmonic distortion plus noise and dynamic range are 0.035-% and 80-㏈, respectively. The modulator consumes 457-uW from 1.2-V power supply.
LPS로 유도한 RAW 264.7 세포의 염증반응에서 흰민들레의 항염증 효과
김민준 ( Min Jun Kim ),배기상 ( Gi Sang Bae ),최선복 ( Sun Bok Choi ),조일주 ( Il Joo Jo ),김동구 ( Dong Goo Kim ),신준연 ( Joon Yeon Shin ),이성곤 ( Sung Kon Lee ),김명진 ( Myoung Jin Kim ),박성주 ( Sung Joo Park ),송호준 ( Ho Jo 대한본초학회 2014 大韓本草學會誌 Vol.29 No.6
Objectives : Taraxacum coreanum (TC) have been used as a traditional medicine to treat inflammatory diseases and anti-oxidant effect in Korea. However, the anti-inflammatory effect of TC water extract on lipopolysaccharide (LPS)-induced inflammation is not well-known. Therefore, this study was performed to identify the anti-inflammatory effect of TC on LPS induced inflammatory. Methods : RAW 264.7 cells were treated with 500 ng/mL of LPS. Water extracts of TC (0.1, 0.25, 0.5 mg/ml) was treated 1 h prior to LPS. Cell viability was measured by MTT assay. Levels of nitric oxide (NO) were measured with Griess reagent and pro-inflammatory cytokines were measured by enzyme-linked immunosorbent assay (ELISA) and real-time polymerase chain reaction (real-time PCR). We also examined molecular mechanisms such as mitogen-activated protein kinases (MAPKs) and nuclear factor-B (NF-κB) activation by western blot. Results : Water Extract from TC itself did not have any cytotoxic effect in RAW 264.7 cells. TC treatment inhibited the production of NO production, and pro-inflamamtory cytokines such as interleukin (IL)-6 and IL-1β on protein and mRNA levels. In addition, TC treatment inhibited the LPS-induced activation of MAPKs such as extracellular signal-regulated kinase1/2 (ERK1/2), p38 kinases (p38), c-Jun NH2-terminal kinase (JNK) and NF-κB. Conclusions : In summary, our result suggest that treatment of TC could reduce the LPS-induced inflammation. Thereby, TC could be used as a protective agent against inflammation. Also, this study could give a clinical basis that TC could be a drug or agent to prevent inflammation.
Effect of Novel Quick Freezing Techniques Combined with Different Thawing Processes on Beef Quality
Jo, Yeon-Ji,Jang, Min-Young,Jung, You-Kyoung,Kim, Jae-Hyeong,Sim, Jun-Bo,Chun, Ji-Yeon,Yoo, Seon-Mi,Han, Gui-Jung,Min, Sang-Gi Korean Society for Food Science of Animal Resource 2014 한국축산식품학회지 Vol.34 No.6
This study investigated the effect of various freezing and thawing techniques on the quality of beef. Meat samples were frozen using natural convection freezing (NF), individual quick freezing (IQF), or cryogenic freezing (CF) techniques, followed by natural convection thawing (NCT) or running water thawing (RT). The meat was frozen until the core temperature reached $-12^{\circ}C$ and then stored at $-24^{\circ}C$, followed by thawing until the temperature reached $5^{\circ}C$. Quality parameters, such as the pH, water binding properties, CIE color, shear force, and microstructure of the beef were elucidated. Although the freezing and thawing combinations did not cause remarkable changes in the quality parameters, rapid freezing, in the order of CF, IQF, and NF, was found to minimize the quality deterioration. In the case of thawing methods, NCT was better than RT and the meat quality was influence on the thawing temperature rather than the thawing rate. Although the microstructure of the frozen beef exhibited an excessive loss of integrity after the freezing and thawing, it did not cause any remarkable change in the beef quality. Taken together, these results demonstrate that CF and NCT form the best combination for beef processing; however, IQF and NCT may have practical applications in the frozen food industry.