• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.181-181
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• 2004

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.100-103
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• 2003

본 논문에서는 RFC 1771에 기반한 BGP4 라우팅 프로토콜개발 후 시험운영과 테스팅 시뮬레이터에 관한 개발 과정을 기술하였다. 시험운영 및 테스팅 시뮬이터는 RFC1771 A Border Gateway Protocol 4 (BGP-4)를 바탕으로 하여 메시지 전송, Path attributes 전송, Route Selection, Finite State Machine , Error 처리 기능을 검증 시험한다. 본고에서는 이에 대한 간략한 망의 구성 방법과 이에 대한 시험시뮬레이터, 및 테스팅 라우터의 환경 설정방식을 제시한다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.38 no.3
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• pp.19-27
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• 2001

Accordingly it is very important to not only develop the stack of protocol, but also try an international standardization regarding the standard protocol of VoIP. Has compared to the advanced countries having already some success in commercialization, Korea is relatively much less involved in relation to this technology and endeavors. In this regards, this paper is focused on developing a protocol stack made with encoder/decoder, the generator or the header file, syntax analyzer etc. based on the protocol grammars of Session Description Protocol supported by IETF RFC2327. For the sake of it, first describe the SDP BNF grammar based on IETF RFC2327 Augmented BNF. And then we produce the Abstract Syntax Tree, header file generator for encoding/decoding as applying the method of syntax directed to SDP protocol grammar.

• The KIPS Transactions:PartC
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• v.11C no.2
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• pp.229-234
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• 2004

In this study, the performance is compared between RFC compatible normal TCP and several speed constraints Ignored TCP. To do these, the main algorithms that constraints the transmit rate of TCP are modified. We have modified TCP protocol stack in a Linux kernel to compare the speeds between the standard TCP and our modified TCP. We find that if the destination is short distance away from the source and packet error is scarce then the speed differences between normal and modified TCP nay be negligible. However, if the destination is far away from the source and slow start algorithm is not adopted then the transfer time for small file is different greatly In addition, if packet error occurred frequently, our modified TCP is faster than the standard TCP regardless of distance.

• Journal of the Korea Society of Computer and Information
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• v.10 no.5 s.37
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• pp.187-198
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• 2005

In this paper, we propose the enhanced header compression scheme for the efficient data traffic transmission in Ipv6 networks. The bandwidth of wireless links and IP networks will probably be limited due to properties of the physical medium and regulatory limits on the use of frequencies for radio communications. That is major cause of user throughput reduction. Therefore, We discuss the IPHC(RFC2507) and ROHC(RFC3095) scheme. IPHC is simple header compression scheme and ROHC is enhanced header compression that have fast optimal recovery scheme. We have studied the enhanced header compression scheme in ROHC. We will show that indication of compression context values preventing from packet losses can provide the fast recovery of compression state. Computer simulations show that the proposed scheme has better performance than the previous one.

• Korean Journal of Microbiology
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• v.36 no.1
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• pp.64-68
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• 2000

The immunopotentiating effects of the polysaccharides, both intracellular and extracellular, was examined by an animal feeding test. The results are summarized as follows. The oral administration of intracellular and extracellular polysaccharides of Agrocybe cylindracea for 10 days resulted in the enhanced phagocytic activity of peritoneal exudate cells(PEC), spleen cells(SC), and monolymphocytes(ML). In the experiment of PFC(plaque forming cell) and RFC(rosette forming cell), the results showed that all the polysaccharide fractions enhanced the immune related cells. The EAC II group(the extracellular polysaccharide of Agrocybe cylindracea 10 mg/0.2 ml distilled water/day/ mouse) increased the PFC and RFC by 46~50% and 43%, respectively, compared to the control group. On the other hand, the IAC I group(the intracellular polysaccharide of Agrocybe cylindracea 1 mg/0.2 ml distilled water/day/mouse) increased the PFC and RFC by 49~70% and 91%, respectively. In terms of the mitogenic activity, the extracellular polysaccharides of A. cylindracea showed a higher activity than the intracellular polysaccharides.

• Food Science and Preservation
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• v.7 no.3
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• pp.285-290
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• 2000

Color values of anthocyanins from seven natural food colorants, such as purple-fleshed sweet potato (PSP), red flower cabbage (RFC), red cabbage (RC), grape skin (GS), black rice (BR), egg plant (EP), and fig fruit (FF) were evaluated, resulting in the selection of four color sources with higher color values including PSP, RFC, RC and GS. The stabilities of anthocyanins from the selected colorant sources against metal ions, ascorbic acid, ultra-violet light, and heating were investigated. Anthocyanins from PSP and GS were degraded significantly by $Mn^{2+}$, while those from RFC and RC were degraded by $Cu^{2+}$. Asthocyanins from PSP were the most stable against the color-degrading factors, followed by RFC, RC, and GS in descending order.

• The Korean Journal of Mycology
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• v.24 no.2 s.77
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• pp.142-148
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• 1996

To find compounds of immunomodulating and anti-allergic function, effects of protein-bound polysaccharides extracted from Phellinus igniarius (PI), Fomitella fraxinea (FF) and Agrocybe cylindracea (AC) on hemagglutinin titer (HA), hemolysin titer (HY), plaque forming cell (PFC), rosette forming cell (RFC) and phagocytosis were investigated in BALB/C mice. The oral administration of the protein-bound polysaccharides of PI, FF and AC for 10 days resulted in the enhanced phagocytic activity of peritoneal exudate cells (PEC), spleen cells (SC) and blood lymphocyte cells (BLC). Moreover, PI showed the activating effect on the phagocytosis of PEC and AC in SC. In the experiment of PFC and RFC, the results of the experimental group which was given each samples as compared to the control group, showed the enhanced level of activity such as PI 130%, FF 90% and AC 70%. Generally, HY and HA showed from ten to hundred times of level in each sample groups, as compared to the control group.

• Journal of Microbiology and Biotechnology
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• v.32 no.7
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• pp.938-948
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• 2022

Gastric cancers (GC) are generally malignant tumors, occurring with high incidence and threatening public health around the world. Circular RNAs (circRNAs) play crucial roles in modulating various cancers, including GC. However, the functions of circRNAs and their regulatory mechanism in colorectal cancer (CRC) remain largely unknown. This study focuses on both the role of circCOL1A2 in CRC progression as well as its downstream molecular mechanism. Quantitative polymerase chain reaction (qPCR) and western blot were adopted for gene expression analysis. Functional experiments were performed to study the biological functions. Fluorescence in situ hybridization (FISH) and subcellular fraction assays were employed to detect the subcellular distribution. Luciferase reporter, RNA-binding protein immunoprecipitation (RIP), co-immunoprecipitation (Co-IP), RNA pull-down, and immunofluorescence (IF) and immunoprecipitation (IP) assays were used to explore the underlying mechanisms. Our results found circCOL1A2 to be not only upregulated in GC cells, but that it also propels the migration and invasion of GC cells. CircCOL1A2 functions as a competing endogenous RNA (ceRNA) by sequestering microRNA-1286 (miR-1286) to modulate ubiquitin-specific peptidase 10 (USP10), which in turn spurs the migration and invasion of GC cells by regulating RFC2. In sum, CircCOL1A2 sponges miR-1286 to promote cell invasion and migration of GC by elevating the expression of USP10 to downregulate the level of RFC2 ubiquitination. Our study offers a potential novel target for the early diagnosis and treatment of GC.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1601-1604
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• 2001

본 논문에서는 SM 메시지(Search Message)를 이용하여 효과적인 예약 오류 최소화를 위한 새로운 RSVP(Resource Reservation Protocol) 알고기즘을 제안한다. 기존의 RFC-2205[1]에 제시된 방안은 각각의 예약 요청을 모두 유지해야하기 때문에 과도한 대역폭 낭비와 이로인한 예약 성공 횟수가 감소되는 문제점을 안고 있다. 대역폭 낭비를 줄이기위해 본 논문에서는 SM 메시지를 도입하였다. 수신자는 주기적으로 SM 메시지를 송신자로 전송하여, 전송로 상의 각 라우터의 사용가능한 대역폭을 검사하여 최소 대역폭으로 각 라우터에 블록케이드 값을 생성한다. 각 라우터에서의 병합작업시 SM 메시지를 이용하여 설정된 블록케이드 값을 기준으로 병합작업 여부를 결정한다. 이는 각각의 예약요청을 별도로 유지해야 할 필요가 없어지므로, 기존의 KRP-I 문제의 해결책인 RFC-2205보다 대역폭 낭비를 줄일수 있게되며 이로인해 예약 수락율이 증가하여 보다 많은 예약 성공 횟수를 얻을수 있게된다. 제안한 SM 알고리즘을 모의 실험 해 본 결과, 예약 수락율이 기존의 RFC-2205보다 전체적으로 약 26% 정도 향상되었다.