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Design of a Low Drop-out Regulator with a UVLO Protection Function (UVLO 보호기능이 추가된 LDO 레귤레이터 설계)

  • Park, Won Kyeong;Lee, Su Jin;Park, Yong Su;Song, Han Jung
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.10
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    • pp.239-244
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    • 2013
  • This paper presents a design of the CMOS LDO regulator with a UVLO protection function for a high speed PMIC. Proposed LDO regulator circuit consists of a BGR reference circuit, an error amplifier and a power transistor and so on. UVLO block between the power transistor and the power supply is added for a low input protection function. Also, UVLO block showed normal operation with turn-off voltage of 2.7V and turn-on voltage of 4 V in condition of 5 V power supply. Proposed circuit generated fixed 3.3 V from a supply of 5V. From SPICE simulation results using a $1{\mu}m$ high voltage CMOS technology, simulation results were 5.88 mV/V line regulation and 27.5 uV/mA load regulation with load current 0 mA to 200 mA.

SOME NEW RESULTS ON POWER CORDIAL LABELING

  • C.M. BARASARA;Y.B. THAKKAR
    • Journal of applied mathematics & informatics
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    • v.41 no.3
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    • pp.615-631
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    • 2023
  • A power cordial labeling of a graph G = (V (G), E(G)) is a bijection f : V (G) → {1, 2, ..., |V (G)|} such that an edge e = uv is assigned the label 1 if f(u) = (f(v))n or f(v) = (f(u))n, For some n ∈ ℕ ∪ {0} and the label 0 otherwise, then the number of edges labeled with 0 and the number of edges labeled with 1 differ by at most 1. In this paper, we investigate power cordial labeling for helm graph, flower graph, gear graph, fan graph and jewel graph as well as larger graphs obtained from star and bistar using graph operations.

POWER CORDIAL GRAPHS

  • C.M. BARASARA;Y.B. THAKKAR
    • Journal of applied mathematics & informatics
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    • v.42 no.2
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    • pp.445-456
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    • 2024
  • A power cordial labeling of a graph G = (V (G), E(G)) is a bijection f : V (G) → {1, 2, ..., |V (G)|} such that an edge e = uv is assigned the label 1 if f(u) = (f(v))n or f(v) = (f(u))n, for some n ∈ ℕ ∪ {0} {0} and the label 0 otherwise, then the number of edges labeled with 0 and the number of edges labeled with 1 differ by at most 1. In this paper, we study power cordial labeling and investigate power cordial labeling for some standard graph families.

Measurement of Linear Energy Spectra for 135 MeV/u Carbon Beams in HIMAC Using Prototype TEPC (프로토 타입 조직등가비례계수기의 중입자가속기연구소의 135 MeV/u 탄소 이온에 대한 선형에너지 스펙트럼 측정)

  • Nam, Uk-Won;Lee, Jaejin;Pyo, Jeonghyun;Park, Won-Kee;Moon, Bong-Kon;Lim, Chang Hwy;Moon, Myung Kook;Kitamure, Hisashi;Kobayashi, Shingo;Kim, Sunghwan
    • Journal of Sensor Science and Technology
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    • v.23 no.3
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    • pp.197-201
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    • 2014
  • TEPC (Tissue Equivalent Proportional Counter) was usually used for high LET radiation dosimetry. We developed a prototype TEPC for micro-dosimetry in the range of $0.2{\sim}300 keV/{\mu}m$. And, the simulated site diameter of the TEPC is $2{\mu}m$, of similar size to a cell nucleus. For purposes of characterization the response for high LET radiation of the TEPC has been investigated under 135MeV/u Carbon ions in HIMAC (Heavy Ion Medical Accelerator). We determined the gas multiplication factor and measured the lineal energy spectrum [yd(y)] of 135 MeV/u Carbon ions. The value of the gas multiplication factor was 315 at 700 V bias voltage. As a result of the experiment, we could more understand the performance of the TEPC for high LET (Linear Energy Transfer) radiation. And the procedure of high LET radiation dosimetry using TEPC is established.

Semantische Unbestimmtheit der Skalaradjektiven (척도형용사의 의미적 불확정성에 대한 연구)

  • Chung Dong-Gyu
    • Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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    • v.10
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    • pp.277-296
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    • 2004
  • Ein sprachlicher Ausdruck ist in verschiedenen Situationen in einer Vielzahl unterschiedlicher Lesarten oder $Pr\"{a}zisierungen$ verwendbar, und zwar mil dom Grad an $Pr\"{a}zision$, der den jeweiligen kormmunikativen Erfordernissen angemessen ist. Sokommt Vagheit/$Ambiguit\"{a}t$ in sprachlichen Ausdrucken fast $durchg\"{a}ngig$ vol. In der vorliegenden Albeit wird die $M\"{o}glichkeit$ der semantischen $\"{U}bersetzung$ der Skalaradjektiven($gro{\ss}$, klein, $hei{\ss}$, kalt, schwer, leicht, schnell, langsam usw.) untersucht, die eigentlich die Vagheit als eine der konstitutiven Eigenschaften haben. Den Schwerpunkt $daf\"{u}r$ bildet die semantische Analyse $\"{u}ber$ die Graduierbarkeit und Vergleichbarkeit der Positivformen der Adjektiven, die vol allem M.J.Cresswell 1976 in seiner Albeit formuliert hat. V(pos) is the function $\eta$ in $D_{{\lll}{0,1}>,<{0,1}{\gg}.{\ll}{0,1,1},>,<{0.1}{\ggg}$ such that where ${\xi}{\in}D_{{\ll}{0,1,1},><{0,1}{\gg}$,$\eta({\xi})$ is the following function: For any ${\omega}{\in}D_{<0,1>$and a ${\in}D_1$ and w$\in$W, w${\in}{\eta}({\xi})({\omega})$(a) iff w ${\in}{\omega}$(a) and there is exactly one b such that ${\xi}({\omega})$(a,b); and for that b, b=$\gg$(for some > and u ${\in}{ \scr}{Z}(>))$ and u is toward the top of the scale determined by > when restricted to those v such that for some c, w${\in} {\xi}({\omega})$$(c,{\;} and w${\in}{\omega}(c)$. (Cresswell, 1976: 272) Obwohl sein Verfahren anhnd von dem semantischen Symbol eine methodische und theoretische $Ad\"{a}quatheit$ erf\"{u}llt$, bleibt der Vergleichwert noch unterspezifiziert. Fur die Behandlung dieser semantischen Unterspezifikation ist eine neue Semantik erforderlich, die den Wahrheitwert fur die $Zugeh\"{o}rigkeitsgrade$ der Skalaradjektive $einschlie{\ss}t$.

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Electrodeposition of some Alpha-Emitting Nuclides and its Isotope Determination by Alpha Spectrometry (몇가지 알파입자 방출 핵종의 전해석출 및 알파 스펙트럼 측정에 의한 그의 동위원소 정량)

  • Key-Suck Jung;In-Suck Suh
    • Journal of the Korean Chemical Society
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    • v.27 no.4
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    • pp.279-286
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    • 1983
  • An apparatus was made for the electrodeposition of alpha emitting actinide nuclides, $^{207}Bi$ and $^{210}Po$. The electrodeposition was made on a polished stainless steel plate cathode. The anode was made of platinum wire and to stir the solution. With the ammonium chloride as electrolyte initial pH = 4, chloride concentration = 0.6M and solution volume = 15ml, a current of 1.5 ampere(current density = 0.59A/$cm^2$) was flowed for 100 minutes for the quantitative recovery of electrodeposition and on average recovery of 98.3% was obtained within ${\pm}$0.7% uncertainty. Alpha spectrometry of the electrodeposited sample showed alpha peaks from $^{210}Po, ^{234}U$ and $^{239}Pu$ having energy resolution (FWHM) of 18.3, 21.8 and 36.0 keV respectively. The electrodeposition and alpha spectrometry for a natural uranium sample of domestic origin gave $^{238}U : ^{234}U = 1 : 6.1{\times}10^{-5}$ and for a neutron-irradiated uranium sample did $^{238}U : ^{239}Pu : ^{241}Am = 100 : 0.0263 : 5.20{times}10^{-5}$. The result of $^{238}U$ determination in the irradiated sample by electrodeposition-alpha spectrometry was in accord within ${\pm}1.6%$ of relative error with the results of solid fluorimetry and mass spectrometry. For $^{239}Pu$ the result of electrodeposition-alpha spectrometry was in accord within ${\pm}$4.0% of relative error with the results of anion exchange separation and the thenoyltrifluoroacetone(TTA) extraction both followed by alpha spectrometries.

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EXISTENCE AND MULTIPLICITY OF SOLUTIONS OF p(x)-TRIHARMONIC PROBLEM

  • Belakhdar, Adnane;Belaouidel, Hassan;Filali, Mohammed;Tsouli, Najib
    • Nonlinear Functional Analysis and Applications
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    • v.27 no.2
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    • pp.349-361
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    • 2022
  • In this paper, we study the following nonlinear problem: $$\{-\Delta_{p}^{3}(x)u\;=\;{\lambda}V_{1}(x){\mid}u{\mid}^{q(x)-2}u\;in\;{\Omega},\\u\;=\;{\Delta}u\;{\Delta}^{2}u\;=\;0\;on\;{\partial}\Omega, $$ under adequate conditions on the exponent functions p, q and the weight function V1. We prove the existence and nonexistence of eigenvalues for p(x)-triharmonic problem with Navier boundary value conditions on a bounded domain in ℝN. Our technique is based on variational approaches and the theory of variable exponent Lebesgue spaces.