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INJECTIVE COVERS OVER COMMUTATIVE NOETHERIAN RINGS WITH GLOBAL DIMENSION AT MOST TWO
Enochs, Edgar-E.,Kim, Hae-Sik,Song, Yeong-Moo Korean Mathematical Society 2003 대한수학회보 Vol.40 No.1
In [3], Del Valle, Enochs and Martinez studied flat envelopes over rings and they showed that over rings as in the title these are very well behaved. If we replace flat with injective and envelope with the dual notion of a cover we then have the injective covers. In this article we show that these injective covers over the commutative noetherian rings with global dimension at most 2 have properties analogous to those of the flat envelopes over these rings.
[멀티미디어 통신] IEEE 802.11e에서 TCP 처리율 향상을 위한 공정성 개선
김에녹(Enoch Kim),정수경(Sookyoung Joung) 한국정보과학회 2013 정보과학회 컴퓨팅의 실제 논문지 Vol.19 No.3
IEEE 802.11e LAN 환경에서 차별화된 서비스를 제공함에 있어 TCP 흐름과 UDP 흐름이 공유되는 환경에서 UDP 흐름은 쉽게 전송하는 것에 비해 TCP 흐름은 통신의 보장이 어려운 문제점이 발생한다. 그로인해 서로 다른 RTT(Round Trip Time) 흐름으로 전송 공정성에 문제가 발생한다. 이를 해결하기위해 TCP 전송의 흐름제어에 사용되는 ACK 신호일 경우 우선순위를 높임으로써 TCP ACK 우선순위 흐름제어 알고리즘을 제안으로 흐름제어를 좋게 하여 UDP 플로우로 잠식되는 현상을 줄여 공정한 전송이 되도록 개선하여 자원의 능동적인 할당으로 전송률 향상에 기여하는 알고리즘을 제안하였다. In IEEE 802.11e system providing differentiated services, there exist some problems which is caused by different transmission mode and decrease of TCP transmission rate as the result of the link occupancy by UDP when TCP shares the link with UDP by the TCP’s flow control characteristic. therefor unfairness occurs due to different RTT(Round Trip Time) among the flows. In this paper, allowing higher priority for ACK frames which control the TCP transmission, the flow control becomes better because that reduces the channel occupancy by UDP flow, and by this, fair transmission is obtained from the result of the more fair transmission and active resource allocation.
DCT를 이용한 영상 데이타의 고감축 적응 변환 부호화
김에녹 건국대학교 1989 論文集 Vol.29 No.2
In this paper, Cex's ATC (adaptive transform coding) is modified for the performance improvement. It is shown that the performance of the modified ATC is better than that of Cox ATC on SUR. Also, it yields better image quality than Cox' ATC, with reduced block effect and granular noise, even at the high compression ratio of about 30: 1.
Magnetic Nanozyme-Linked Immunosorbent Assay for Ultrasensitive Influenza A Virus Detection
Oh, Sangjin,Kim, Jeonghyo,Tran, Van Tan,Lee, Dong Kyu,Ahmed, Syed Rahin,Hong, Jong Chul,Lee, Jaewook,Park, Enoch Y.,Lee, Jaebeom American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.15
<P>Rapid and sensitive detection of influenza virus is of soaring importance to prevent further spread of infections and adequate clinical treatment. Herein, an ultrasensitive colorimetric assay called magnetic nano(e)zyme-linked immunosorbent assay (MagLISA) is suggested, in which silica-shelled magnetic nanobeads (MagNBs) and gold nanoparticles are combined to monitor influenza A virus up to femtogram per milliliter concentration. Two essential strategies for ultrasensitive sensing are designed, i.e., facile target separation by MagNBs and signal amplification by the enzymelike activity of gold nanozymes (AuNZs). The enzymelike activity was experimentally and computationally evaluated, where the catalyticity of AuNZ was tremendously stronger than that of normal biological enzymes. In the spiked test, a straightforward linearity was presented in the range of 5.0 × 10<SUP>-15</SUP>-5.0 × 10<SUP>-6</SUP>g·mL<SUP>-1</SUP> in detecting the influenza virus A (New Caledonia/20/1999) (H1N1). The detection limit is up to 5.0 × 10<SUP>-12</SUP> g·mL<SUP>-1</SUP> only by human eyes, as well as up to 44.2 × 10<SUP>-15</SUP> g·mL<SUP>-1</SUP> by a microplate reader, which is the lowest record to monitor influenza virus using enzyme-linked immunosorbent assay-based technology as far as we know. Clinically isolated human serum samples were successfully observed at the detection limit of 2.6 PFU·mL<SUP>-1</SUP>. This novel MagLISA demonstrates, therefore, a robust sensing platform possessing the advances of fathomable sample separation, enrichment, ultrasensitive readout, and anti-interference ability may reduce the spread of influenza virus and provide immediate clinical treatment.</P> [FIG OMISSION]</BR>
( Fangfang Sun ),( Sangjin Oh ),( Jeonghyo Kim ),( Tatsuya Kato ),( Hwa-jung Kim ),( Jaebeom Lee ),( Enoch Y. Park ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.8
In this study, silver nanoparticles (AgNPs) were synthesized by the citrate reduction process and, with the assistance of n-hydroxysuccinimide and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide, were successfully loaded with the macromolecular drug vancomycin (VAM) to form AgNP-VAM bioconjugates. The synthesized AgNPs, VAM, and AgNP-VAM conjugate were characterized by UV-visible spectroscopy, zeta potential analysis, confocal microscopy, and transmission electron microscopy. The effect of loading VAM onto AgNPs was investigated by testing the internalization of the bioconjugate into Mycobacterium smegmatis. After treatment with the AgNP-VAM conjugate, the bacterial cells showed a significant decrease in UV absorption, indicating that loading of the VAM on AgNPs had vastly improved the drug`s internalization compared with that of AgNPs. All the experimental assessments showed that, compared with free AgNPs and VAM, enhanced internalization had been successfully achieved with the AgNP-VAM conjugate, thus leading to significantly better delivery of the macromolecular drug into the M. smegmatis cell. The current research provides a new potential drug delivery system for the treatment of mycobacterial infections.