• Title/Summary/Keyword: V-t

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A Low Power SRAM Using Elevated Source Level Memory Cells (소스 전압을 높인 메모리 셀을 이용한 저전력 SRAM)

  • 양병도;김이섭
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.8
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    • pp.93-98
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    • 2004
  • A low power SRAM using elevated source level memory cells is proposed to save the write power of SRAM. It reduces the swing voltages of the bit lines and data bus by elevating the source level of the memory cells from GND to $V_{T}$ and lowering the precharge level of the bit lines and data bus from $V_{DD}$ to $V_{DD}$ - $V_{T}$. It saves the write power of SRAM without area overhead and speed degradation. An SRAM with 8K${\times}$32bits is fabricated in a 0.25um CMOS process. It saves 45% of the power in write cycles at 300MHz with 2.5V. The maximum operating frequency is 330MHz.

Population-Based Newborn Hearing Impairment Screening Test Using GJB2 Mutation Analysis

  • Lee, Kyung-Ok;Jeong, Su-Jin;Byun, Ji-Young;Kim, Jeong-Sook;Lee, Hye-Jung;Seong, Hye-Soon;Kim, Kyung-Tae
    • Korean Journal of Clinical Laboratory Science
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    • v.39 no.2
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    • pp.113-121
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    • 2007
  • Hearing loss is a common congenital disorder that is frequently associated with mutations in the Cx26 gene (GJB2). Recently, the mutation analysis of GJB2 has been used in a newborn screening test for the detection of hearing impairment. Population-based studies should be performed before the application of genetic testing for the identification of deaf newborns. In this study, 8 positions of GJB2 mutations-including 35delG, 167delT, 235delC, V27I, V37I, M34T, E114G, and I203T-were analyzed using PCR-direct sequencing in a total of 437 healthy Korean neonates. DNAs from dried blood spots were extracted using a commercial DNA extraction kit. The PCR-amplified products (783 bps) of the GJB2 gene were detected using 2% agarose gel electrophoresis and subjected to direct sequencing. The sequences were compared with those in the GenBank database by using the BLAST program. In this study, 5 GJB2 mutations -including V27I (79G>A), V37I (109G>A), E114G (341A>G), I203T (608T>C), and 235delC- were found. Of the 437 neonate samples, 301 subjects showed GJB2 mutations (68.9%, 301/437). The V27I mutation was found in 271 subjects and was the most frequent (62.0%, 271/437). The E114G, I203T and V37I mutations were shown in 146, 17 and 14 subjects, respectively. The 235delC mutation was found in 1 subject. The E114G mutation was frequently accompanied by the V27I mutation. V27I/E114G (97.2%, 143/147) was the most common double mutation and 3 subjects had the double mutation V27I/I203T. A triple mutation, V27I/E114G/I203T, was found in 1 subject. In conclusion, PCR-direct sequencing is a convenient tool for the rapid detection of GJB2 mutations and this data might provide information for the genetic counseling of the GJB2 gene.

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A summary of KEPCO's 765kV substation design (한전 765kV 변전소의 기본설계 개요)

  • Kim, M.D.;Jung, S.H.;Kim, J.H.
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2139-2142
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    • 1999
  • 765kV substations which will be the core installation of the bulk power transmission system in Korea for the upcoming $21^{st}$ century, were designed of outdoor full GIS type to minimize required area. As principal equipment, main transformers of 2,000 MVA per bank and 50kA 8,000A gas insulated switchgears of up-to-date technology were adopted in designing substations to transmit bulk power of 10GW. Dual digital protective relay systems and distributed indication and control systems with fiber optic LAN were used.

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Study on the Structure of DNA Containing a Thymine Dimer and $T_4$ Endonuclense V * DNA Complex (Thymine Dimer를 포함한 DNA와 $T_4$ Endonuclease V * DNA 복합체의 구조에 관한 연구)

  • 이봉진;유준석;임형미
    • Biomolecules & Therapeutics
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    • v.2 no.1
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    • pp.28-33
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    • 1994
  • In order to obtain insight into the repair mechanism of DNA containing thymine photo-dimer, the conformation of the duplex d(GCGGTTGGCG).d(CGCCAACCGC) with a thymine dimer incorporated has been studied by proton NMR. NOE data show that, although the local environment around the thymine dimer is altered, the gross structural changes are relatively small. T$_4$endonuclease V exhibited a conformational change on complex formation with DNA. This conformational change occurred around histidine 16 which was close to tyrosine 129 located in the aromatic segment (WYKYY) near the C-terminus. It is likely that the interaction between T$_4$endonuclease V and DNA is strong since the complex was not dissociated up to 1.6 M NaCl.

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Breakdown, V-t and Degradation Characteristics of Insulation in Liquid Nitrogen for HTS Transformer (고온초전도 변압기를 위한 액체질소 중 절연 파괴, V-t. 열화 특성)

  • Nguyen, Van-Dung;Joung, Jong-Man;Baek, Seung-Myeong;Lee, Chang-Hwa;Suck, Song-Hee;Kim, Sang-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.6
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    • pp.316-323
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    • 2004
  • HTS transformer is one of the most promising devices to supply enough electric energy for quick increase consumption. However, for practical design of the HTS transformer, it is necessary to establish the research on breakdown, V-t characteristics, degradation, and so on. In this paper, we discussed breakdown characteristics and V-t characteristics of polyimide/L$N_2$ and glass fiber reinforced plastic/$LN_2$ composite insulations. These composite insulations have been used as turn-to-turn and layer-to-layer insulations for HTS transformer respectively, Moreover, we investigated the degradation of these insulation samples after breakdown using microscope and SEM photograph.

Intermolecular Interaction and Molecular Energy Transfer ; Vibrational Relaxation of Highly Excited HF and DF (문자간 상호작용과 에너지이동에 대한 이론적 연구 ; 높은 振動準位로 들뜬 HF 및 DF 의 振動緩和)

  • Chang Soon Lee;Min Joo Lee;Yoo Hang Kim
    • Journal of the Korean Chemical Society
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    • v.29 no.6
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    • pp.592-598
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    • 1985
  • The total vibrational deexcitation rate constants $k_{v,v-1}$ of HF(v = 5-7) by HF(${\mu}$ = 0) and DF(${\mu}$ = 9-12) by DF(${\mu}$= 0) including both the vibration to vibration (V ${\to}$ V) and vibration to rotation and translation (V ${\to}$ R, T) energy transfer channels have been calculated semiclas-sically using a simplified collision model. The calculated results are in reasonably good agreement with those obtained by experimental and other theoretical studies. The rate constants increase with increasing temperature and also with increasing v. They also show that the relaxation of the highly excited HF and DF occurs predominantly via the V ${\to}$ R, T path at low temperature. The effectiveness of the V ${\to}$ V path, however, increases as the temperature is raised.

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A TIME-INDEPENDENT CONDITIONAL FOURIER-FEYNMAN TRANSFORM AND CONVOLUTION PRODUCT ON AN ANALOGUE OF WIENER SPACE

  • Cho, Dong Hyun
    • Honam Mathematical Journal
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    • v.35 no.2
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    • pp.179-200
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    • 2013
  • Let $C[0,t]$ denote the function space of all real-valued continuous paths on $[0,t]$. Define $X_n:C[0,t]{\rightarrow}\mathbb{R}^{n+1}$ by $Xn(x)=(x(t_0),x(t_1),{\cdots},x(t_n))$, where $0=t_0$ < $t_1$ < ${\cdots}$ < $t_n$ < $t$ is a partition of $[0,t]$. In the present paper, using a simple formula for the conditional expectation given the conditioning function $X_n$, we evaluate the $L_p(1{\leq}p{\leq}{\infty})$-analytic conditional Fourier-Feynman transform and the conditional convolution product of the cylinder functions which have the form $$f((v_1,x),{\cdots},(v_r,x))\;for\;x{\in}C[0,t]$$, where {$v_1,{\cdots},v_r$} is an orthonormal subset of $L_2[0,t]$ and $f{\in}L_p(\mathbb{R}^r)$. We then investigate several relationships between the conditional Fourier-Feynman transform and the conditional convolution product of the cylinder functions.

Kinetics and Mechanism of Mutant O-acetylserine Sulfhydrylase-A (C43S) from Salmonella typhimurium LT-2

  • Yoon, Moon-Young
    • BMB Reports
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    • v.29 no.3
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    • pp.210-214
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    • 1996
  • The pH dependence of the kinetic parameters of mutant O-acetylserine sulfhydrylase (OASS) from Salmonella typhimurium LT-2 has been determined in order to obtain information on the chemical mechanism. The initial velocity pattern obtained by varying the concentrations of OAS at several fixed concentrations of TNB, shows an intersection on the left of the ordinate at pH 7.0, indicating that the kinetic mechanism is a sequential mechanism in which substrate inhibition by OAS is observed while the wild type enzyme showed a ping pong mechanism. The values of $V/E_t$, $V/K_{OAS}E_{t}$ and $V/K_{TNB}E_{t}$ decreased by about 68%, 14% and 16% as compared with the wild type enzyme. The $V/K_{OAS}E_{t}$ is a pK of 6.5 on the acid side of the pH profile, and the $V/K_{TNB}$ is pH independent. As compared with the wild type enzyme, the pKs in the V/K profiles are shifted, reflecting that binding of the cofactor in free E:OAS is less asymmetric.

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A study for Decision Method of Human Body Safety according to Power Load Fluctuation of the Chechon Area (제천지역 전력부하변동에 따른 인체 전 판단 방법에 대한 연구)

  • 김상철;김두현
    • Journal of the Korean Society of Safety
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    • v.15 no.4
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    • pp.69-77
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    • 2000
  • This paper presents a study for decision method of human body safety according to power load fluctuation of the Chechon area. To cope with substantial electromagnetics analysis, the safety assessments were analyzed the double 154 [kV] T/L, 345 [kV] T/L, Chechon-Ichon, Chechon-Youngju, respectively. As the results of case study, in case of 345 [kV] T/L, the electric field value was 11.4927 [kV/m], magnetic field value was 0.4622 [G] at the point about 7 [m] away from the line in severest case. The results showed that the membership of a proposition fuzzy '11.4937 [kV/m] is hazardous' is 0.7063 for the severest case in case of 345 [kV] T/L. As the analytic results using the fuzzy qualifier term, the membership in case of very false is 0.0862 and fairly false is 0.5419, respectively.

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A Development of Semantic Connected Service between Vehicles and Things for IoV (차량 인터넷 기술을 위한 시맨틱 차량-사물 연결 서비스 구현)

  • Ryu, Minwoo;Cha, Siho
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.14 no.4
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    • pp.27-33
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    • 2018
  • The recent efforts in academia and industry represent a paradigm shift that will extend the IoT from the home environment so that it is interoperable with the Internet of Vehicles (IoV). IoV is a special kind of IoT. It allows to connect between vehicle and things located in infrastructure. Furthermore, IoV enable to create new intelligent services through collaboration with existing various services such as smart city and connected home. In this paper, we develop a service in order to realize IoV. To this end, we design a novel vehicle service platform which could automatical controlling the IoT device according to drivers' voice. To show practical usability of our proposed platform, we develop a prototype service could be call car-to-thing (C2T). We expect that our proposed platform could eventually contribute to realizing IoV.