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가변적인 복수 해슁을 이용한 글로벌 IPv6 유니캐스트 주소 검색 구조
박현태,문병인,강성호,Park Hyun-Tae,Moon Byung-In,Kang Sung-Ho 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.5b
IP 주소 검색 구조는 IPv6 주소체계의 도래와 함께 더욱 고속 네트워크 기술의 중요한 이슈가 되고 있다. 본 논문에서는 차세대 인터넷 라우터를 위한 새로운 글로벌 IPv6 유니캐스트 주소 검색 구조를 제안한다. 제안하는 구조는 적절한 프리픽스 그룹화를 수행하고 각 그룹별로 가변적으로 복수 해슁을 수행한다. 이를 통해 적절한 개수의 포워딩 테이블에서 해슁의 충돌(collision)을 효율적으로 분산함으로서 오버플로우를 최소화하였으며 포워딩 테이블 구성을 위해 필요한 메모리 크기를 줄였다. 또한 단 한 번의 메모리 접근만으로 포워딩 테이블 구성 및 검색이 가능한 고속 주소 검색 구조이며 추가적 업데이트가 용이한 구조이다. 실제 6bone 테스트 라우팅 CERNET 데이터를 이용하여 균일한 복수 해슁을 이용한 구조와 제안한 구조를 비교, 실험하였으며 동일한 8개의 테이블에서 약 15%의 포워딩 테이블을 위한 메모리 절약과 약 50%의 오버플로우 감소를 확인하였다. An IP address lookup scheme has become a critical issue increasingly for high-speed networking techniques due to the advent of IPv6 based on 128bit. In this paper, a novel global IPv6 unicast address lookup scheme is proposed for next generation internet routers. The proposed scheme perform a variable multiple hashing based on prefix grouping. Accordingly, it should not only minimize overflows with the proper number of memory modules, but also reduce a memory size required to organize forwarding tables. It has the fast building and searching mechanisms for forwarding tables during only a single memory access. Besides, it is easy to update forwarding tables incrementally. In the simulation using CERNET routing data as a 6bone test phase, we compared the proposed scheme with a similar scheme using a uniform multiple hashing. As a result, we verified that the number of overflows is reduced by 50% and the size of memory for forwarding tables is shrunken by 15% with 8 tables.
Synthesis and Characterization of Blue Light Emitting Polymers Based on Arylene Vinylene
박현태,김윤희,신동철,신성철,김진학,권순기 한국고분자학회 2011 Macromolecular Research Vol.19 No.9
New blue polymers having poly(arylenevinylene) derivatives composed of biphenylene-vinylene-m-(tbutylated)phenylene-vinylene and terphenylene-vinylene-m-(t-butylated)phenylene-vinylene in the main chain were synthesized by nickel catalyzed Yamamoto coupling and palladium-catalyzed Suzuki coupling reactions. The polymers showed good solubility in a common organic solvent and weight average molecular weights of 11,100 to 9,800 with a polydispersity index of 1.46-1.2. The polymers with a highly twisted structure exhibited deep blue emission with (λ_max=465 for the homopolymer and λ_max=457 nm for copolymer) as well as good thermal stability. Double layer light emitting diode devices fabricated using the obtained polymers as emitters showed blue emission with a maximum brightness of 18-225 cd/m^2.
RE-05 : The effect of estradiol on adipose tissue inflammation
박현태,장항용,이경욱,김용진,신정호,허준용,김선행,김탁 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.99 No.-
It is known that premenopausal women have lower risks for cardiovascular disease compared to men, and this sex advantage for women gradually disappear after menopause. However, the mechanisms underlying these sex differeneces are insufficiently understood. Recent studies have demonstrated that inflammation in adipose tissue has strong impacts on cardiovascular diseases. Moreover, macrophage polarization in adipose tissue has grown to become a key player in cardio-metabolic disorder. Our aim was to investigate sex specific response of adipose tissue immune cells to high fat diet and the role of estradiol to adipose tissue inflammation We develpoed C57BL/6J male, non-ovariectomized (SHAM) female, ovariectomized female, and ovariectomized female with estradiol or aromatase inhibitor to receive a normal or high fat diet. High fat diet induced adipose tissue inflammatory markers and macrophage polarization in male mice. Female mice with intact ovary were resistant to HFD induced macrophage polarization. However, T cells (CD4, CD8), dendritic cells and macrophage polarization increased in ovariectomized femlae mice compared to SHAM group. Estradiol supplementation normalized these inflammatory changes wheareas aromatase inhibitor supplementation aggrevated these changes Macrophage polarization and B and T cells, and dendritic cell change by estrogen deficiency may play an important role in developing cardio- metabolic disorder in postmenopausal women.
Mannitol 投與에 依한 Na 及 水分의 排泄에 對하여
朴鉉邰,洪世鎔 고려대학교 의과대학 1976 고려대 의대 잡지 Vol.13 No.1
During the infusion of 20% mannitol, free water reasorption and osmolar clearance were studied in 15 normal man who were admitted to the department of Intermal Medicine, Woo Sok hospital, College of Medicine, Korea University from January to September, 1975. The result obtained were as followings. 1. Urine volume was increased by the infusion of mannitol. 2. The amount of excreted sodium and the rate of sodium excretion were increased by the infusion of mannital but none of them were influenced by GFR and the level of serum sodium. 3. Free water reabsorption and osmolar clearance were increased by the infusion of mannitol. 4. The slope of the increment of free water reabsorption and osmolar clearance during mannitol diuresis was significant.
癌細胞 L_(1210)의 增殖抑制에 미치는 大戟과 大黃 抽出物의 影響에 對한 硏究
朴鉉邰 고려대학교 의과대학 1985 고려대 의대 잡지 Vol.22 No.1
This study is attempted to obtain basic data for the development of anticancer drug from Korean medicinal herbs, Galarhaeus pekinensis and Rheum coreanum. As a preliminary experiment, cytotoxic potencies were determined from six kinds of extract used various solvents based on their polarities. Then, the effects of incubation time, size distribution of cells, cloning efficiency, development of resistance against drugs, and stability of drug in the culture medium were. determined after treatment of chloroform extract which showed strongest activity. The experimental results obtained are summarized as follows. 1. The doubling time of L_(1210) cells used in this experiment was about 11 hours. 2. The cytotoxic activity of chloroform extract of Rheum coreanum(l unit=0. 009mg) was more active than the extract of Galarhaeus pekinensis(l unit=0.013mg). 3. The cytotoxic activities of Galarhaeus pekinensis and Rheum coreanum were shown highest within 12 hours during incubation, and then the activities were gradually decreased. 4. The peak of size distribution curve shifted from 240 c.m to 60 c.m when L_(1210) cells incubated with each chloroform extract. 5. The viability of L_(1210) cells was lost completely or above 90% within 5 hours when incubated in media containing 5 unit of Galarhaeus pekinensis or 2 unit of Rheum coreanum. 6. The stability of each extract in the culture medium decreased during incubation and resistance of L_(1210) cells against drugs observed somewhat when the cells mere treated with same concentration of drugs after medium change.