• Title/Summary/Keyword: q-w

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Non-Enzymatic Browning Reaction of the Dried File-Fish (건조(乾燥) 말쥐치의 비효소적(非酵素的) 갈변(褐變))

  • Chun, Soon-Sil;Kim, Mu-Nam;Lee, Kang-Ho
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.11 no.3
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    • pp.21-27
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    • 1982
  • A kinetical approach for the non-enzymatic browning reaction of the dried file-fish was studied. The reaction rates revealed a tend to increase with increasing water activity and showed the maximum at $0.75\;a_w$ The activation energies obtained from the Arrhenius plot ranged 12.5 to 16.5 Kcal/mole. From these energies of activation, the $Q_{10}$ values at $45^{\circ}C$ showed 1.9 to 2.3 and both activation energy and $Q_{10}$ values were reduced with increase in $a_w$ Shelf-lives, the time to reach an 0.15 O.D./g solid at which severe brown color change could be de ectable, decreased rapidly as the temperature and water activity increase. A storage study under a square-wave fluctuating temperature condition (at 35 and $55^{\circ}C$ periodically with 7 days interval), the rate constants at all water activities used in the experiments were higher than those at $45^{\circ}C$, the mean temperature of the cycle which affects other kinetic parameters including activation energies, $Q_{10}$ values and finally the shelf-lives. The data obtained from the fluctuating temperaure storage study will be used in prediction of shelf-life. The shelf lives assessed at $25^{\circ}C$ from the accelerated shelf-life tests ranged from 179 daysat $0.75\;a_w$ to 302 days at $0.44\;a_w$.

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Design of Q-Band LC VCO and Injection Locking Buffer 77 GHz Automotive Radar Sensor (77 GHz 자동차용 레이더 센서 응용을 위한 Q-밴드 LC 전압 제어 발진기와 주입 잠금 버퍼 설계)

  • Choi, Kyu-Jin;Song, Jae-Hoon;Kim, Seong-Kyun;Cui, Chenglin;Nam, Sang-Wook;Kim, Byung-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.3
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    • pp.399-405
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    • 2011
  • In this paper, we present the design of Q-band LC VCO and injection locking buffer for 77 GHz automotive radar sensor using 130 nm RF CMOS process. To improve the phase noise characteristic of LC tank, the transmission line is used. The negative resistance by the active device cross-coupled pair of buffer is used for high output power, with or without oscillation of buffer. The measured phase noise is -102 dBc/Hz at 1 MHz offset frequency and tuning range is 34.53~35.07 GHz. The output power is higher than 4.1 dBm over entire tuning range. The fabricated chip size is $510{\times}130\;um^2$. The power consumption of LC VCO is 10.8 mW and injection locking buffer is 50.4 mW from 1.2 V supply.

A Study on the Estimation of Optimal Unit Content of Binder for the Soil Stabilizer Using the Recycled Resource in DMM (심층혼합공법에서 순환자원을 활용한 지반안정재의 최적 단위결합재량 산정에 관한 연구)

  • Seo, Se-Gwan;Lee, Khang-Soo;Kim, You-Seong;Cho, Dae-sung
    • Journal of the Korean Geosynthetics Society
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    • v.18 no.2
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    • pp.37-44
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    • 2019
  • The compressive strength of the soil stabilizer in the deep mixing method (DMM) depends on kinds of soil, particle size distribution, and water content. Because of this, Laboratory test has to perform to estimate the unit weight of binder to confirm the satisfaction of the design strength. In this study, uniaxial compression strength was measured by mixing the soil stabilizers developed in the previous study with clay in Busan, Yeosu, and Incheon area. And the strength enhancement effect was evaluated comparing with blast furnace slag cement (BFSC). Also, the relationship between the unit content of binder and uniaxial compressive strength was investigated in order to easily calculate the unit weight of binder required to ensure the stability of the ground at the field. As the results of the analysis, the relationship between the unit content of binder and the uniaxial compressive strength are ${\gamma}_B=(108.93+0.0284q_u){\pm}35$ when W/B is 70%, and ${\gamma}_B=(122.93+0.0270q_u){\pm}40$ when W/B is 80%.

On algorithm for finding primitive polynomials over GF(q) (GF(q)상의 원시다항식 생성에 관한 연구)

  • 최희봉;원동호
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.11 no.1
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    • pp.35-42
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    • 2001
  • The primitive polynomial on GF(q) is used in the area of the scrambler, the error correcting code and decode, the random generator and the cipher, etc. The algorithm that generates efficiently the primitive polynomial on GF(q) was proposed by A.D. Porto. The algorithm is a method that generates the sequence of the primitive polynomial by repeating to find another primitive polynomial with a known primitive polynomial. In this paper, we propose the algorithm that is improved in the A.D. Porto algorithm. The running rime of the A.D. Porto a1gorithm is O($\textrm{km}^2$), the running time of the improved algorithm is 0(m(m+k)). Here, k is gcd(k, $q^m$-1). When we find the primitive polynomial with m odor, it is efficient that we use the improved algorithm in the condition k, m>>1.

A Wideband LNA and High-Q Bandpass Filter for Subsampling Direct Conversion Receivers (서브샘플링 직접변환 수신기용 광대역 증폭기 및 High-Q 대역통과 필터)

  • Park, Jeong-Min;Yun, Ji-Sook;Seo, Mi-Kyung;Han, Jung-Won;Choi, Boo-Young;Park, Sung-Min
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.45 no.11
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    • pp.89-94
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    • 2008
  • In this paper, a cascade of a wideband amplifier and a high-Q bandpass filter (BPF) has been realized in a 0.18mm CMOS technology for the applications of subsampling direct-conversion receivers. The wideband amplifier is designed to obtain the -3dB bandwidth of 5.4GHz, and the high-Q BPF is designed to select a 2.4GHz RF signal for the Bluetooth specifications. The measured results demonstrate 18.8dB power gain at 2.34GHz with 31MHz bandwidth, corresponding to the quality factor of 75. Also, it shows the noise figure (NF) of 8.6dB, and the broadband input matching (S11) of less than -12dB within the bandwidth. The whole chip dissipates 64.8mW from a single 1.8V supply and occupies the area of $1.0{\times}1.0mm2$.

On Generalized 𝜙-recurrent Kenmotsu Manifolds with respect to Quarter-symmetric Metric Connection

  • Hui, Shyamal Kumar;Lemence, Richard Santiago
    • Kyungpook Mathematical Journal
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    • v.58 no.2
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    • pp.347-359
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    • 2018
  • A Kenmotsu manifold $M^n({\phi},\;{\xi},\;{\eta},\;g)$, (n = 2m + 1 > 3) is called a generalized ${\phi}-recurrent$ if its curvature tensor R satisfies $${\phi}^2(({\nabla}_wR)(X,Y)Z)=A(W)R(X,Y)Z+B(W)G(X,Y)Z$$ for all $X,\;Y,\;Z,\;W{\in}{\chi}(M)$, where ${\nabla}$ denotes the operator of covariant differentiation with respect to the metric g, i.e. ${\nabla}$ is the Riemannian connection, A, B are non-vanishing 1-forms and G is given by G(X, Y)Z = g(Y, Z)X - g(X, Z)Y. In particular, if A = 0 = B then the manifold is called a ${\phi}-symmetric$. Now, a Kenmotsu manifold $M^n({\phi},\;{\xi},\;{\eta},\;g)$, (n = 2m + 1 > 3) is said to be generalized ${\phi}-Ricci$ recurrent if it satisfies $${\phi}^2(({\nabla}_wQ)(Y))=A(X)QY+B(X)Y$$ for any vector field $X,\;Y{\in}{\chi}(M)$, where Q is the Ricci operator, i.e., g(QX, Y) = S(X, Y) for all X, Y. In this paper, we study generalized ${\phi}-recurrent$ and generalized ${\phi}-Ricci$ recurrent Kenmotsu manifolds with respect to quarter-symmetric metric connection and obtain a necessary and sufficient condition of a generalized ${\phi}-recurrent$ Kenmotsu manifold with respect to quarter symmetric metric connection to be generalized Ricci recurrent Kenmotsu manifold with respect to quarter symmetric metric connection.

Microwave Transistor Oscillator by Cavity Rexsonator (캐비티 동조에 의한 마이크로파 트란지스터 발진기)

  • 장익수;김병철
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.19 no.5
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    • pp.20-25
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    • 1982
  • A realization method of the microwave oscillator is proposed by the inherently stable transistor with a cavily resonator feedback loop. The real Part of the output impedance of the inherently stable bipolar transistor can be made to be negative at the resonance frequency by the high-Q cavity feedback loop, and the oscillation condition can be obtained with the matching section of the load. In this work the microwave transistor oscillator is realized with a silicon bipolar transistor HXTR 2101 and a reentrani cavity, and characteristic of the output power 10m Watts at 2.33 GHz osc. frequency can be verified experimentally.

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PD Detection in Air by Capacitive Electric Field Sensor (전계센서의 원리를 이용한 공기중 부분방전신호 검출)

  • Lee, Y.H.;Lee, K.W.;Park, S.H.;Kang, S.H.;Shin, Y.S.;Lim, K.J.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.900-903
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    • 2002
  • Partial discharges(PD) in air, corona discharges, deteriorate the insulation strength. So, it is necessary to detect PD at an early stage before the system failure and extensive damage to the equipment. PD emit signals which can be detected by applying an capacitive electric field diagnosis. In this paper, We measured signals by capacitive electric field sensor and analyzed FFT from PD, and then compared conventional electric PD detecting method to capacitive electric field diagnosis by $\Psi-q-n$, $\Psi-v-n$, $\Psi-n$, $\Psi-q$ distributions.

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A High-Speed Source Follower Type Analog Buffer Circuit Using LTPS TFTs for 2.2-inch qVGA TFT-LCD panel

  • Kim, Hyun-Wook;Bae, Han-Jin;Lee, In-Hwan;Kwon, Oh-Kyong
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.1287-1290
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    • 2006
  • A high speed analog buffer using polycrystalline silicon (poly-Si) thin film transistors (TFT) is proposed for 2.2-inch quarter video graphic adapter (qVGA) TFT-LCD panel. Simulation results show that the settling time of the proposed circuit is $10{\mu}sec$ in 2.2-inch qVGA and the power consumption of proposed analog buffer is $25{\mu}W$.

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Single-Phase Grid-Connected Power Converter of the PLL Error Compensation Method Using d-q Coordinate Transformation (d-q 좌표 변환 기법을 이용한 단상 계통 연계형 전력변환기의 PLL 오차 보상기법)

  • Park, Chang-Seok;Kam, Seung-Han;Jung, Tae-Uk
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1064-1065
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    • 2015
  • 단상 계통 연계형 전력 변환기에서 계통과 연계하기 위해서는 계통의 위상 정보를 정확히 측정하여 전력 변환기의 출력 주파수와 위상이 동일한 상태로 전류가 공급 되도록 해야 한다. 본 논문에서는 단상 d-q 좌표 변환 기법을 통한 위상 동기화 기법을 적용하여 왜곡된 계통전압이 d축 전압에 야기 되는 에러 성분을 최소화 하는 보상 기법을 제안한다. 제안된 기법은 동기 d축 전압을 일정한 주기로 적분하여 에러 성분을 최소화 한 후, PI제어를 통해 d축 전압을 0으로 수렴하게 하는 기법이다. 제안된 기법은 추가적인 하드웨어를 요구하지 않는다. 본 논문의 타당성을 검증하기 위해 3[kW]급 단상 계통 연계형 전력변환기 시작품을 제작하고 실험을 통해 증명하였다.

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