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정후민,신윤권,조상복,이종화 울산대학교 2001 공학연구논문집 Vol.32 No.2
압저항형 스마트 실리콘 압력 센서를 0.6 ㎛ 이중 폴리 실리콘 이중 금속 CMOS 공정으로 구현하기 위하여 설계하였다. 이 스마트 실리콘 압력 센서는 압저항형 저항기들로 된 휘스톤 브리지를 갖는 다이아프램과 op-amp, A/D 변환기, 및 UART 회로 등의 주변회로 들로 구성되어 있다. 브리지 회로의 출력 전압과 압력에 의한 기계적 응력 사이의 관계를 COSMOS-M 상용프로그램으로 다이아프램의 응력 분포를 모의실험하여, 압저항기의 최적의 위치와 크기에 대한 연구를 하였다. CMOS op-amp 회로는 규정된 출력 특성을 얻기 위하여 크기가 다른 트랜지스터들로 설계하여 HSPICE로 모의실험하여 최적화 시켰다. A/D 변화기 회로는 가능한 칩 면적을 줄이기 위하여 서브 레인징 기법과 신경 MOSFET 구조를 이용하여 설계하였다. UART회로는 VHDL 소스 코드와 셀 라이브러리를 이용하고 Synopsys로 합성하여 설계하였다. 회로의 물리적 레이아우트 설계는 Mentor 틀로 설계하였다. 그러나 온도보상회로와 출력오프셋 문제는 아직 해결하지 못하고 다음에 연구할 예정이다. A piezoresistive smart silicon pressure sensor is designed to implement with 0.6 ㎛ double-polysilicon double-metal CMOS precess. This smart pressure sensor is composed of a diaphragm with piezoresistive resistors' Wheatstone bridge and the peripheral circuitry of op-amp, A/D converter and UART. The relationship between the output voltage of the bridge circuit and the mechanical stress by applied pressure was studied by simulating the stress distribution on the diaphragm with COSMOS-M package program to optimize the size and position of piezoresistors. The CMOS op-amp circuit was designed with different CMOS transistor sizes to obtain the defined op-amp output characteristics and simulated with HSPICE. The A/D converter was designed using neuron MOSFET structure and sub-ranging method to minimize the chip area. The UART circuit was designed by using VHDL source code and cell library and by synthesizing with Synopses and the physical layout of the circuit was designed with Mentor tools. The problems for temperature compensation and the output voltage offset were not yet considered.
Shin, Gee-Wook,Lee, Hu-Jang,Jung, Tae-Sung Korean Society of Environmental Health 2003 한국환경보건학회지 Vol.29 No.4
Jinyangho is a natural water supply source of tap water in west Gyeongnam area, but mass mortality of crusian carp occurred during the time of temperature rise in spring. Examinations on diseased fishes were able to isolate four bacteria isolates and then identified the bacteria as a member of Aeromonas sp. Challenge experiment with mirror carp (Gyrinus carpiospecilaris) was proved the virulence, the isolates were in turn believed as the causative agent of mass mortality in Jinyangho.
Study on Traditional Chinese Medicine against Liver Fibrosis
Hu, Xiao-Ping,Son, Chang-Gue,Shin, Jang-Woo,Cho, Jung-Hyo,Cho, Chong-Kwan,Yoo, Hwa-Seung,Lee, Yeon-Weol Research Institute of Korean Medicine 2006 한의학연구소 논문집 Vol.15 No.2
간섬유화는 다양한 만성 간질환에 기인하는 간실질의 결합조직의 과도한 증식을 말하며, 간경화로 발전하는 중간과정이다. 중국과 한국에는 많은 간섬유화 환자가 있지만 현재까지 서양의학에서 간섬유화를 효과적으로 치료할 수 있는 치료법은 발견되지 않고 있다. 최근 수년간 중국전통의학의 임상과 실험연구에서 많은 발전이 있었다. 전통의학이론을 바탕으로 활혈거어(活血祛瘀), 익기(益氣)의 효능이 있는 한약제가 항섬유화 효능을 보였다. 전통중국의학에서 간섬유화에 대한 일반적인 치료는 유효 성분, 단방 및 복방 처방의 세 부분으로 나뇐다. 우리는 중국전통의학에서 간섬유화의 효과적인 치료와 관련된 작용기작을 소개하였다.
Oral Bioavailability and Enterohepatic Recirculation of Otilonium Bromide in Rats
Shin, Beom-Soo,Kim, Jung-Jun,Kim, John,Hu, Sul-Ki,Kim, Hyoung-Jun,Hong, Seok-Hyun,Kim, Han-Kyung,Lee, Hye-Suk,Yoo, Sun-Dong 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.1
This study was conducted to examine the oral bioavailability and the possibility of enterohepatic recirculation of otilonium bromide in rats. A sensitive LC/MS/MS assay (LLOQ 0.5 ng/mL) was developed for the determination of otilonium and applied to i.v. and oral administration studies in bile duct cannulated (BDC) and non-BDC rats. After i.v. injection to BDC rats (1 mg/kg as otilonium), average $t_{1/2}$, CL, $V_z$ and AUC were $7.9\;{\pm}\;1.9\;h,\;8.7\;{\pm}\;3.1$ mL/min/kg, $5.7\;{\pm}\;1.4$ L/kg and $2,088\;{\pm}\;676\;ng{\cdot}h/mL$, respectively, and these values were comparable to those found in non-BDC rats. The percentages of i.v. dose excreted unchanged in bile and urine in BDC rats were $11.6\;{\pm}\;3.0$ and $3.1\;{\pm}\;0.7$%, respectively. Upon oral administration to non-BDC rats (20 mg/kg as otilonium), $t_{1/2},\;C_{max},\; T_{max}$ and AUC were $6.4\;{\pm}\;1.3\;h,\;182.8\;{\pm}\;44.6\;ng/mL,\; 1.9\;{\pm}\;1.6\;h$ and $579\;{\pm}\;113\;ng{\cdot}h/mL$, respectively. The absolute oral bioavailability was low (1.1%), while the drug was preferentially distributed to gastrointestinal tissues. A secondary peak was observed in the serum concentration-time profiles in non-BDC rats following both i.v. and oral administration, indicating that otilonium bromide was subject to enterohepatic recirculation.
On the Multi-User Diversity with Secrecy in Uplink Wiretap Networks
Hu Jin,Won-Yong Shin,Bang Chul Jung IEEE 2013 IEEE COMMUNICATIONS LETTERS Vol.17 No.9
<P>In this letter, we consider the uplink wiretap network which consists of a base station, N legitimate users, and several eavesdroppers. We propose a novel user scheduling algorithm based on a threshold, which achieves the optimal multi-user diversity gain, i.e., log log N. To the best of our knowledge, there has been no such result in uplink wiretap networks. In order to obtain good throughput performance in the network, the threshold value needs to be carefully chosen. Through extensive simulations, we observe that the proposed user scheduling outperforms the conventional scheduling algorithms and it approaches the throughput performance of the optimal user scheduling algorithm in various scenarios.</P>
Direct Solvothermal Synthesis of B/N‐Doped Graphene
Jung, Sun‐,Min,Lee, Eun Kwang,Choi, Min,Shin, Dongbin,Jeon, In‐,Yup,Seo, Jeong‐,Min,Jeong, Hu Young,Park, Noejung,Oh, Joon Hak,Baek, Jong‐,Beom WILEY‐VCH Verlag 2014 Angewandte Chemie Vol.126 No.9
<P><B>Abstract</B></P><P>Heteroatom‐doping into graphitic networks has been utilized for opening the band gap of graphene. However, boron‐doping into the graphitic framework is extremely limited, whereas nitrogen‐doping is relatively feasible. Herein, boron/nitrogen co‐doped graphene (BCN‐graphene) is directly synthesized from the reaction of CCl<SUB>4</SUB>, BBr<SUB>3</SUB>, and N<SUB>2</SUB> in the presence of potassium. The resultant BCN‐graphene has boron and nitrogen contents of 2.38 and 2.66 atom %, respectively, and displays good dispersion stability in <I>N</I>‐methyl‐2‐pyrrolidone, allowing for solution casting fabrication of a field‐effect transistor. The device displays an on/off ratio of 10.7 with an optical band gap of 3.3 eV. Considering the scalability of the production method and the benefits of solution processability, BCN‐graphene has high potential for many practical applications.</P>
Common variants at the promoter region of the $APOM$ confer a risk of rheumatoid arthritis
Hu, Hae-Jin,Jin, Eun-Heui,Yim, Seon-Hee,Yang, So-Young,Jung, Seung-Hyun,Shin, Seung-Hun,Kim, Wan-Uk,Shim, Seung-Cheol,Kim, Tai-Gyu,Chung, Yeun-Jun Korean Society for Biochemistry and Molecular Bion 2011 Experimental and molecular medicine Vol.43 No.11
Although the genetic component in the etiology of rheumatoid arthritis (RA) has been consistently suggested, many novel genetic loci remain to uncover. To identify RA risk loci, we performed a genome-wide association study (GWAS) with 100 RA cases and 600 controls using Affymetrix SNP array 5.0. The candidate risk locus ($APOM$ gene) was re-sequenced to discover novel promoter and coding variants in a group of the subjects. Replication was performed with the independent case-control set comprising of 578 RAs and 711 controls. Through GWAS, we identified a novel SNP associated with RA at the $APOM$ gene in the MHC class III region on 6p21.33 (rs805297, odds ratio (OR) = 2.28, $P=5.20{\times}10^{-7}$). Three more polymorphisms were identified at the promoter region of the $APOM$ by the re-sequencing. For the replication, we genotyped the four SNP loci in the independent case-control set. The association of rs805297 identified by GWAS was successfully replicated (OR = 1.40, $P=6.65{\times}10^{-5}$). The association became more significant in the combined analysis of discovery and replication sets (OR = 1.56, $P=2.73{\times}10^{-10}$). The individuals with the rs805297 risk allele (A) at the promoter region showed a significantly lower level of $APOM$ expression compared with those with the protective allele (C) homozygote. In the logistic regressions by the phenotype status, the homozygote risk genotype (A/A) consistently showed higher ORs than the heterozygote one (A/C) for the phenotype-positive RAs. These results indicate that $APOM$ promoter polymorphisms are significantly associated with the susceptibility to RA.