• The Transactions of the Korean Institute of Electrical Engineers P
• /
• v.60 no.3
• /
• pp.126-132
• /
• 2011

A conventional LDO(Low Dropout Regulator) uses one OPAMP and one signal path. This means that OPAMP's DC Gain and Bandwidth can't optimize simultaneously within usable power. This also appears that regulation property and settling time of LDO can't improve at the same time. Based on this idea, a proposed LDO uses two OPAMP and has two signal path. To improve regulation property, OPAMP where is used in the path which qualities DC gain on a large scale, bandwidth designed narrowly. To improve settling time, OPAMP where is used in the path which qualities DC gain small, bandwidth designed widely. A designed LDO used 0.5um 1P2M process and provided 200mA of output current. A line regulation and load regulation is 12.6mV/V, 0.25mV/mA, respectively. And measured settling time is 1.5us in 5V supply voltage.

• Journal of the Korean Mathematical Society
• /
• v.31 no.3
• /
• pp.467-475
• /
• 1994

In 1983 Harmand and Lima [5] proved that if X is a Banach space for which K(X), the space of compact linear operators on X, is an M-ideal in L(X), the space of bounded linear operators on X, then it has the metric compact approximation property. A strong converse of the above result holds if X is a closed subspace of either $\elll_p(1 < p < \infty) or c_0 [2,15]$. In 1979 J. Johnson [7] actually proved that if X is a Banach space with the metric compact approximation property, then the annihilator K(X)^\bot$ of K(X) in $L(X)^*$ is the kernel of a norm-one projection in $L(X)^*$, which is the case if K(X) is an M-ideal in L(X).

• Journal of the Korean Society for Heat Treatment
• /
• v.21 no.4
• /
• pp.205-212
• /
• 2008

Characteristics of microstructures, mechanical properties and formability of two Al-20Si-5Fe-2Ni alloys produced by gas atomizing (P/M) and spray forming (S/F) respectively were compared at temperatures up to $560^{\circ}C$. Room temperature hardness values and tensile strengths of both alloys were increased in accordance with temperature after heat treatment above $300^{\circ}C$. The highest values of hardness and tensile strength of both alloys were obtained at $490^{\circ}C$. It was interpreted that increase in hardness and tensile strength according to heating temperature between $300{\sim}490^{\circ}C$ was mainly related to increase in internal stress between Al matrix and reprecipitated particles. S/F alloys showed better formability and wear property than P/M alloys due to the homogenity of microstructures above $300^{\circ}C$.

• Kyungpook Mathematical Journal
• /
• v.3 no.2
• /
• pp.39-41
• /
• 1960

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.10a
• /
• pp.203-208
• /
• 2006

본 논문에서는 MPEG-21 프레임워크를 Peer-to-Peer Network 상에서 구동시킬 때의 문제점을 해결하면서, P2P의 장점을 최대한 이용할 수 있도록 하는 P2P 방식의 디지털 권한 관리 시스템(P2PDRMEngine)을 설계한다. MPEG-21 프레임워크의 여러 구성 요소들 중 IPMP(Intellectual Property Management and Protection components), DI(Digital Item), Multimedia Contents 등의 구조에 몇 가지 요소를 추가하여 P2PDRMEngine과 MPEG-21 프레임워크가 서로 유기적인 동작을 할 수 있도록 설계하고 또한, DI를 생산, 배포, 사용할 때 사용자에게 편리성을 제공 해주는 기능도 고려한다. P2PDRMEngine은 기존의 MPEG-21 프레임워크의 수행에 지장을 주지 않으면서 보안적인 측면과 요소 간의 기능을 강화하는 데 초점을 맞추어 설계한 시스템이다.

• Biomaterials and Biomechanics in Bioengineering
• /
• v.1 no.2
• /
• pp.63-71
• /
• 2014

This study aimed to develop a novel bioactive hybrid xerogel consisting of silk fibroin /$SiO_2-CaO-P_2O_5$ by sol-gel process at room temperature. Scanning electron microscopy (SEM), FT-IR Spectroscopy, pore measurement, mechanical property testing, in vitro bioactivity test and cytotoxicity assay were performed to characterize the xerogel for bone tissue engineering application. We have found that the xerogel possessed excellent pore structures and mechanical property. Once immersed in a simulated fluid (SBF), the xerogel exhibited profound bioactivity by inducing hydroxyapatite layers on its surfaces. The cell toxicity study also demonstrated that there was little toxic to MC3T3-E1 cells. These results indicate that silk fibroin /$SiO_2-CaO-P_2O_5$ hybrid xerogel potentially could be used as a bone tissue engineering material.

• Communications for Statistical Applications and Methods
• /
• v.24 no.5
• /
• pp.443-455
• /
• 2017

In this paper, we study ARCH(${\infty}$) models with either geometrically decaying coefficients or hyperbolically decaying coefficients. Most popular autoregressive conditional heteroscedasticity (ARCH)-type models such as various modified generalized ARCH (GARCH) (p, q), fractionally integrated GARCH (FIGARCH), and hyperbolic GARCH (HYGARCH). can be expressed as one of these cases. Sufficient conditions for $L_2$-near-epoch dependent (NED) property to hold are established and the functional central limit theorems for ARCH(${\infty}$) models are proved.

• Textile Coloration and Finishing
• /
• v.7 no.2
• /
• pp.17-23
• /
• 1995

In order to study the dyeing property of acrylic and cotton blends with cationic and reactive dyes, staining on cotton of cationic dyes, stability of cationic dyes, and fastness properties in various conditions were investigated. The restlts obatined from this study are summarized as follows: 1. Cationic oxazine dyes showed good stability in comparison with cationic azo dyes. 2. Staining of cationic dyes on cotton was gradually increased with pH and neutral salt concentration, but decreased with dyeing time and dyeing temperture.

• Kyungpook Mathematical Journal
• /
• v.56 no.2
• /
• pp.371-386
• /
• 2016

Using the hesitant intersection (${\Cap}$), the notions of ${\Cap}$-hesitant fuzzy subalgebras, ${\Cap}$-hesitant fuzzy ideals and ${\Cap}$-hesitant fuzzy p-ideals are introduced,and their relations and related properties are investigated. Conditions for a ${\Cap}$-hesitant fuzzy ideal to be a ${\Cap}$-hesitant fuzzy p-ideal are provided. The extension property for ${\Cap}$-hesitant fuzzy p-ideals is established.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
• /
• v.22
• /
• pp.201-226
• /
• 2004

P & I Clubs are mutual and non-profit making insurers which offer shipowners cover for the contractual and third-party liabilities. Whereas most shipowners obtain P & I insurance to cover for their legal liabilities, they also obtain hull insurance to cover against damages to the hull of their vessels from commercial hull insurers. P & I insurance was distinguished from hull insurance in respect that it offered non-limited cover to shipowner member, but there was a serious debate between P & I Clubs in respect of the non-limited cover. A compromise by International Group of P & I Clubs eventually emerged under which, with effect from 20 February 1997, a financial cap was placed on the obligation of each shipowner to pay catasrophe calls to his club(20% of each ship's property limitation fund under 1976 Limitation Convention). Nevertheless many shipowners felt that this new cap on their potential catastrophe call had been set still too high, while others resisted any reduction in the figure established by the compromise. In the Meantime, the European Commission issued a Statement of Objections in June 1997, in which it indicated its objections with a compulsory single limit common th all the Group clubs as high as the 1997 compromise. Eventually the board of all the Group clubs decided that the figure of 20% of the Limitation Convention per ship property funds should be dropped down to 2.5% from 20 February 1999.