• Title/Summary/Keyword: Property B

Search Result 2,001, Processing Time 0.03 seconds

POLYNOMIALITY OF THE EQUIVARIANT GROMOV-WITTEN THEORY OF ℙr-1

  • Lho, Hyenho
    • Bulletin of the Korean Mathematical Society
    • /
    • v.58 no.3
    • /
    • pp.573-591
    • /
    • 2021
  • We study the equivariant Gromov-Witten theory of ℙr-1 for all r ≥ 2. We prove a polynomiality property in r of the Gromov-Witten classes of ℙr-1. Using this polynomiality property, we define a set of polynomial valued classes in $H^*({\bar{M}}_{g,n})$ which generalize the limit of Witten's s-spin classes studied by Pandharipande, Pixton and Zvonkine.

TRACE PROPERTIES AND INTEGRAL DOMAINS, III

  • Lucas, Thomas G.;Mimouni, Abdeslam
    • Bulletin of the Korean Mathematical Society
    • /
    • v.59 no.2
    • /
    • pp.419-429
    • /
    • 2022
  • An integral domain R is an RTP domain (or has the radical trace property) (resp. an LTP domain) if I(R : I) is a radical ideal for each nonzero noninvertible ideal I (resp. I(R : I)RP = PRP for each minimal prime P of I(R : I)). Clearly each RTP domain is an LTP domain, but whether the two are equivalent is open except in certain special cases. In this paper, we study the descent of these notions from particular overrings of R to R itself.

PERSISTENCE AND POINTWISE TOPOLOGICAL STABILITY FOR CONTINUOUS MAPS OF TOPOLOGICAL SPACES

  • Shuzhen Hua;Jiandong Yin
    • Bulletin of the Korean Mathematical Society
    • /
    • v.61 no.4
    • /
    • pp.1137-1159
    • /
    • 2024
  • In the paper, we prove that if a continuous map of a compact uniform space is equicontinuous and pointwise topologically stable, then it is persistent. We also show that if a sequence of uniformly expansive continuous maps of a compact uniform space has a uniform limit and the uniform shadowing property, then the limit is topologically stable. In addition, we introduce the concepts of shadowable points and topologically stable points for a continuous map of a compact topological space and obtain that every shadowable point of an expansive continuous map of a compact topological space is topologically stable.

The Analysis on Wear Behavior of Cu-$TiB_2$ Composite For Contact Wire (전차선용 Cu-$TiB_2$ 복합재료의 마모거동에 관한 분석)

  • Kim Jung-Nam;Lee Tae-Woo;Kwon Sung-Tae;Kang Kae-Myung
    • Proceedings of the KSR Conference
    • /
    • 2004.10a
    • /
    • pp.704-709
    • /
    • 2004
  • The wear behavior and the mechanical property of Cu-$TiB_2$ composites were examined. Cu-$TiB_2$ composites were fabricated by hot extrusion and cold drawing with $TiB_2$ contents(1$\∼$5vol.$\%$) and the size of $TiB_2$ particles(10$\mu$m and 20$\mu$m). The pin-an-disk wear test was carried out under dry sliding wear conditions which loads varied with from 20N to 100N. At the time, counterpart wear material used SM45C. The experimental results showed that the friction coefficient and wear rate decreased with increasing the $TiB_2$ contents and decreasing the size of $TiB_2$ particle. Also, the depth of plastically deformed zone decreased with increasing the $TiB_2$ contents and decreasing the size of $TiB_2$ particle.

  • PDF

Temperature rise calculation of a disc type motor with heat source method (열회로 방식에 의한 Disc type motor의 온도상승 계산)

  • Park, Chang-Soon;Chang, Ki-Chan
    • Proceedings of the KIEE Conference
    • /
    • 1991.07a
    • /
    • pp.43-46
    • /
    • 1991
  • Nd-Fe-B Permanent Magnet, which is recently more used, has some advantages in comparison with other permanent magnet. However, for the Nd-Fe-B has higher RTC(reversible temperature coefficient), property of the Nd-Fe-B magnet is changed by temperature rise. In this paper temperature rise of a disc type motor is calculated using a heat source network method.

  • PDF

BOUNDEDNESS AND CONTINUITY OF SOLUTIONS FOR STOCHASTIC DIFFERENTIAL INCLUSIONS ON INFINITE DIMENSIONAL SPACE

  • Yun, Yong-Sik;Ryu, Sang-Uk
    • Bulletin of the Korean Mathematical Society
    • /
    • v.44 no.4
    • /
    • pp.807-816
    • /
    • 2007
  • For the stochastic differential inclusion on infinite dimensional space of the form $dX_t{\in}\sigma(X_t)dW_t+b(X_t)dt$, where ${\sigma}$, b are set-valued maps, W is an infinite dimensional Hilbert space valued Q-Wiener process, we prove the boundedness and continuity of solutions under the assumption that ${\sigma}$ and b are closed convex set-valued satisfying the Lipschitz property using approximation.

신약설계를 위한 화합물 DB-chemical Database for Drug Design-

  • Lee, Seong-Gwang;No, Gyeong-Tae
    • Journal of Scientific & Technological Knowledge Infrastructure
    • /
    • s.5
    • /
    • pp.41-50
    • /
    • 2001
  • 화학구조 D B는 그 목적에 다양하게 분류될 수 있는데, 유사한 약효를 검색하기 위한 유사도 검색(similarity search) DB와 유기합성을 위한 reaction DB, 실험이나 계산으로 얻은 물성을 모은 property DB, 생물학적 검증 데이터를 모은 activity DB등이 있다. 이러한 화학 D B는 신약을 설계하는 입장에서 볼 때, 앞에서 말한 다양한 D B로서의 목적을 모두 충족시킬 수 있는 유기적인 설계가 바람직하다.

  • PDF

Comparison of the Tribological behaviors of Various Organic Molecular Films (다양한 유기분자막의 마찰특성 비교)

  • ;;;V. Tsukruk
    • Tribology and Lubricants
    • /
    • v.17 no.5
    • /
    • pp.386-390
    • /
    • 2001
  • Monolayers such as self-assembled monolayer (SAM) have received considerable attention to reduce stiction and friction in micro-devices and microelectromechanical systems (MEMS). Various organic molecular films were investigated to obtain better understanding of their tribological behaviors and adhesion property. The organic molecular films studied in this work are: epoxysilane SAMs, octadecyltricholosilane (OST), multi-layers composed of epoxysilane SAMs, poly[styrene-b-(ethylene-co-butylene)-b-styrene](SEBS) and compound of epoxy resin and poly (paraphenylene)(EP/PPP). The pull-off forces of these films were also obtained from force-distance curves measured in static mode of operation of atomic force microscope(AFM). Tribological tests were conducted with a ball-on-flat reciprocating friction tester. The OST showed the lowest pull-off force, indicating its low adhesion property. It was revealed that, the OST, EP/PPP and the multi-layer of epoxysilane SAMs, SEBS and EP/PPP exhibited good tribological properties at the lower load (0.3 N) whereas the OST showed best performance at the higher load (1.8 N).

A New Fuzzy Adaptive Controller Using the Robust Property of a Fuzzy of a Fuzzy Controller and Its Design Method (퍼지 제어기의 강연성을 이용한 새로운 퍼지 적응 제어기의 설계)

  • 김승우;김은태;박민용
    • Journal of the Korean Institute of Telematics and Electronics B
    • /
    • v.30B no.9
    • /
    • pp.106-121
    • /
    • 1993
  • A New fuzzy adaptive controller which is able to solve the problems of classical adaptive controllers and conventional fuzzy adaptive controllers is suggested in this paper. The architecture of a fuzzy adaptive controller using the robust property of a fuzzy controller is explained. A design procedure which can be carried out mathematically and systematically from the model of an objective system is suggested, and related mathematical theorems and their proofs are also given. The performance of the proposed adaptive control algorithm is analyzed through a design example and a DC motor control simulation.

  • PDF