• 제목/요약/키워드: Ping

검색결과 1,340건 처리시간 0.026초

Partial Purification and Characterization of a Glycoprotein Factor from Fresh Ginseng

  • Kong, Yun-Cheung;Fong, Wing-Ping;Song, Myung-Eun;Ng, Kam-Hung;Ho, Dan-Dan;Ng, Ping-Chung
    • 고려인삼학회:학술대회논문집
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    • 고려인삼학회 1990년도 Proceedings of International Symposium on Korean Ginseng, 1990, Seoul, Korea
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    • pp.79-85
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    • 1990
  • The aqueous extract of fresh ginseng (Panax ginseng C.A. Meyer) contains a macromolecular fraction that showed mitogenic and comitogenic activities in human peripheral blood Iymphocytes. Purification of the crude extract by size (ultrafiltration, Sephadex G-200) and charge (DEAE-cellulose. DEAE-Sepharose) yielded a semi-purified fraction (DS-3). This fraction contains at least three subgroups of anionic macromolecules with apparent molecular weight greater than 600 kilodaltons. It is a glycoprotein with a large amount of glucuronic acid. It acts as a mitogen in both T and B cells of human peripheral blood lymphocytes. It could also potentiate the mitogenic action of Concanavalin A in Iymphocyte T cells. Such potentiation is not due to increased binding of Concanavalin A to the cell surface. Its mitogenic and co-mitogenic effects do depend on the presence of extracellular Ca2+.

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Stress-strain relationship for recycled aggregate concrete after exposure to elevated temperatures

  • Liang, Jiong-Feng;Yang, Ze-Ping;Yi, Ping-Hua;Wang, Jian-Bao
    • Computers and Concrete
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    • 제19권6호
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    • pp.609-615
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    • 2017
  • In this paper, the effects of elevated temperatures on the strength and compressive stress-strain curve (SSC) of recycled coarse aggregate concrete with different replacement percentages are presented. 90 recycled coarse aggregate concrete prisms are heated up to 20, 200, 400, 600, $800^{\circ}C$. The results show that the compressive strength, split tensile strength, elastic modulus of recycled aggregate concrete specimens decline significantly as the temperature rise. While the peak strain increase of recycled aggregate concrete specimens as the temperature rise. Compared to the experimental curves, the proposed stress-strain relations for recycled aggregate concrete after exposure elevated temperatures can be used in practical engineering applications.

A Named Data Networking Testbed with Global NDN Connection

  • ;임헌국
    • 한국통신학회논문지
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    • 제40권12호
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    • pp.2419-2426
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    • 2015
  • Named Data Networking (NDN) is one of the powerfully evolving future internet architectures. In this paper installation, configuration and several tests are addressed to show how well and properly our NDN testbed have been prepared and established using NDN platform, in order to have interoperability with global NDN testbed. Global NDN testbed status with our NDN node participation was addressed. To verify one reachability on the NDN connection to global NDN testbed, a latency result is presented using NDN ping test.

INTERGALACTIC MEDIUM IN THE ACDM UNIVERSE FROM COSMOLOGICAL SIMULATIONS

  • FENG LONG-LONG;HE PING;FANG LIZHI;SHU CHI-WANG;ZHANG MENG-PING
    • 천문학회지
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    • 제38권2호
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    • pp.129-133
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    • 2005
  • The temperature (T) and entropy (S) fields of baryonic gas, or intergalactic medium (IGM), in the ACDM cosmology are analyzed using simulation samples produced by a hybrid cosmological hydrodynamic/N-body code based on the weighted essentially non-oscillatory scheme. We demonstrate that, in the nonlinear regime, the dynamical similarity between the IGM and dark matter will be broken in the presence of strong shocks in the IGM. The heating and entropy production by the shocks breaks the IGM into multiple phases. The multiphase and non-Gaussianity of the IGM field would be helpful to account for the high-temperature and high-entropy gas observed in groups and clusters with low-temperature IGM observed by Ly$\alpha$ forest lines and the intermittency observed by the spikes of quasi-stellar object's absorption spectrum.

Non-square colour image scrambling based on two-dimensional Sine-Logistic and Hénon map

  • Zhou, Siqi;Xu, Feng;Ping, Ping;Xie, Zaipeng;Lyu, Xin
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제11권12호
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    • pp.5963-5980
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    • 2017
  • Image scrambling is an important technology in information hiding, where the Arnold transformation is widely used. Several researchers have proposed the application of $H{\acute{e}}non$ map in square image scrambling, and certain improved technologies require scrambling many times to achieve a good effect without resisting chosen-plaintext attack although it can be directly applied to non-square images. This paper presents a non-square image scrambling algorithm, which can resist chosen-plaintext attack based on a chaotic two-dimensional Sine Logistic modulation map and $H{\acute{e}}non$ map (2D-SLHM). Theoretical analysis and experimental results show that the proposed algorithm has advantages in terms of key space, efficiency, scrambling degree, ability of anti-attack and robustness to noise interference.

Emerging Roles of Krüppel-Like Factor 4 in Cancer and Cancer Stem Cells

  • Ding, Bo;Liu, Ping;Liu, Wen;Sun, Ping;Wang, Chun-Ling
    • Asian Pacific Journal of Cancer Prevention
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    • 제16권9호
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    • pp.3629-3633
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    • 2015
  • Cancer stem cells (CSCs) are rare subpopulations within tumors which are recognized as culprits in cancer recurrence, drug resistance and metastasis. However, the molecular mechanisms of how CSCs are regulated remain elusive. Kr$\ddot{u}$ppel-like factors (KLFs) are evolutionarily conserved zinc finger-containing transcription factors with diverse functions in cell differentiation, proliferation, embryogenesis and pluripotency. Recent progress has highlighted the significance of KLFs, especially KLF4, in cancer and CSCs. Therefore, for better therapeutics of cancer disease, it is crucial to develop a deeper understanding of the mechanisms of how KLF4 regulate CSC functions. Herein we summarized the current understanding of the transcriptional regulation of K LF4 in CSCs, and discussed the functional implications of targeting CSCs for potential cancer therapeutics.

임베디드 리눅스를 이용한 IPv6 라우터의 설계에 관한 연구 (The IPv6 Router Design on Embedded Linux)

  • 류재훈;김정태;류광렬
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2003년도 추계종합학술대회
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    • pp.243-246
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    • 2003
  • 본 논문은 프로세서가 내장된 임베디드 리눅스 툴킷을 이용하여 IP 패킷을 기존의 IPv4 네트워크에서 IPv6 네트워크로 변환해주는 라우터 설계에 관한 연구이다. 주소 변환 플렛폼으로 프로세서를 이용하여 IPv6 모듈을 리눅스에 이식하였으며, IPv4 네트워크와 IPv6 네트워크를 구성하여 실험하였다. 시험망 구축을 위하여 기존 IPv4망과 IPv6망의 터널링 기법으로 구성한 결과, ICMP ping6을 이용 패킷 응답값은 2 홉스에 평균 2$\mu$sec정도이다.

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