IPv6 네트워크에서 이동 단말의 지역적 이동성 제공 방안

전홍선,우미애 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.8B

With rapid advances in wireless communication technologies and with the advent of the smaller and high-performance mobile handsets nowadays, many researches are actively performed for providing seamless communications while mobile nodes are roaming around. As real-time application programs are more prevalent, it is very important to manage mobility of mobile nodes efficiently. In this paper, we propose a localized mobility support scheme that is based on the Mobile IPv6 by IETF. The proposed scheme enhances functionalities in mobile nodes and only uses signaling messages of Mobile IPv6. The performance of the proposed scheme is evaluated through analytical model and simulations. According to the results of the evaluation, the proposed scheme provides better performance than Mobile IPv6 in terms of packet losses and TCP throughput by localizing the binding update messages inside the foreign domain during handoffs and reducing binding update time. 오늘날 무선 통신 기술의 급속한 발전과 이동 단말의 소형화, 고성능화가 실현됨에 따라 이동 중 데이터 통신이 가능하도록 하기 위한 연구가 활발하게 이루어지고 있다. 실시간 응용 프로그램의 사용이 늘어나면서, 이를 이동 단말에서 원활하게 제공받기 위해서는 이동 단말의 이동성을 효율적으로 관리하는 것이 매우 중요하다. 본 논문에서는 IETF에서 개발한 Mobile IPv6를 기반으로 지역적 이동성 기능을 제공하기 위하여 이동 노드의 기능을 강화한 방안을 제안하고 해석적 분석과 모의실험을 통하여 성능을 분석하였다. 본 논문에서 제안한 방안은 이동단말이 외부 도메인 내에서 핸드오프 시 바인딩 메시지를 지역 내에서 처리하여 자신의 위치를 갱신하는 시간을 감소시킴으로써 Mobile IPv6보다 패킷 손실을 줄이고 TCP 처리율을 높임을 알 수 있었다.

IPv6 망에서 이동 노드의 지역적 이동성 지원 방안의 성능 분석

전홍선(Hong-Sun Jun),우미애(Miae Woo) 한국통신학회 2003 한국통신학회 학술대회논문집 Vol.2003 No.7

낙동포의 조석특성에 관한 연구

전승환,전홍선 한국항해항만학회 1983 한국항해학회지 Vol.7 No.2

In this paper, we have investigated the tidal characteristics of the Nakdongpo estuary. We have carried out the analysis of harmonic constant with the use of the recorded data on tidal level at the Gadeong Do tide station and analyzed the flow velocity data obtained by ourselves at two points in the Nakdongpo estuary. In addition, we have analyzed the variation of the mean-sea level. Typical items of the characteristics we have found are; (1) The principal harmonic constants and non-harmonic constants are shown in table 2. (2) Tide in this area shows the semidiurnal inequality. (3) The mean-sea level is shown to be depressed at the rate of about 1cm to the rise of 1 mbar of the atmospheric pressure. (4) (i) At $K_2$ point, The E-W component of the velocty reveals the nature of progressive waves. The N-S component reveals the nature of stationary waves. (ii) At $K_3$ point, The E-W component shows the characteristics of progressive waves to some degree. The N-S component shows a weak hint of stationary waves. (5) At $K_2$ point, S-component is predominant due to the flow of river. At $K_3$ point, E-component is predominant due to the Tsushima current.

Methicillin 내성 황색포도알균의 검출을 위한 Phoenix System의평가

전경란,전홍선,성흥섭,김미나 대한임상미생물학회 2006 Annals of clinical microbiology Vol.9 No.1

BACTEC 혈액배양병 양성검체에서 직접접종법에 의한 균종동정과 항균제감수성검사를 위한 MicroScan과 Phoenix 시스템의 평가

정재우,전홍선,성흥섭,김미나* 대한진단검사의학회 2009 Annals of Laboratory Medicine Vol.29 No.1

Background : Procedures for rapid identification and susceptibility testing by direct inoculation (DI) from positive blood culture bottles into an automated system have not been standardized. This study was purposed to evaluate DI from BACTEC 9240 blood culture system (BD, USA) into MicroScan (Dade Behring, USA) or Phoenix (BD, USA). Methods : From May to June 2006, bacterial pellets from positive aerobic bottles showing grampositive cocci (GPC) or gram-negative rods (GNR) of single morphology were directly inoculated to MicroScan PosCombo1A and NegCombo32 and to Phoenix PMIC/ID-107 and NMIC/ID-53. In addition, the automated instruments were also inoculated from subcultures (standard inoculations, SI). Species identification and susceptibilities were compared between DI and SI and between MicroScan and Phoenix. Results : A total of 108, 104, and 78 specimens were tested with MicroScan, Phoenix, and both, respectively. When DI and SI were matched, 94.8% of GPC were correctly identified with MicroScan, compared to 80.7% with Phoenix, and 93.9% of GNR were correctly identified with MicroScan, compared to 95.7% with Phoenix. DI with MicroScan and Phoenix showed correct susceptibilities in 94.6% of 1,150 and 96.5% of 660 tests (with very major error [VME] of 1.1% and 1.1%), respectively, among GPC and in 94.4% of 942 and 96.3% of 781 tests (with VME of 0.6% and 0%), respectively, of GNR. Correlation of identification/susceptibilities between MicroScan and Phoenix using DI were 81.8%/98.0% for Staphylococcus aureus and 100.0%/95.6% for Escherichia coli. Conclusions : DI warrants a reliable method for identification and susceptibility testing of both GPC and GNR in MicroScan, and those of only GNR in Phoenix. 서론 : 혈액배양에서 직접접종법은 아직 표준화되어 있지 않 다. 본 연구는 BACTEC 9240 시스템(BD, USA)을 이용한 혈액 배양의 종동정과 감수성검사에서 MicroScan (Dade Behring, USA)과 Phoenix (BD, USA)의 직접접종법 수행능을 평가하였다. 방법 : 2006년 5월부터 6월까지 BACTEC 9240에서 양성인 혈액배양병 중 그람양성알균(gram positive cocci, GPC)이나 그람음성막대균(gram negative rods, GNR) 한 종만이 관찰된 검체의 균 침사를 GPC은 MicroScan PosCombo Panel Type 1A와 Phoenix PMIC/ID-107에, GNR은 MicroScan Neg- Combo Panel Type 32와 Phoenix NMIC/ID-53에 직접 접종 하였고, 표준접종법은 양성배양액을 혈액한천배지에 하룻밤 계 대배양한 집락을 이용하여 동일한 조건으로 검사하였다. 각 기 기 내 및 두 기기 간에서 직접법의 표준법에 대한 균동정과 항 균제감수성결과 일치율을 알아보았다. 결과 : MicroScan 108검체, Phoenix 104검체에 대해 평가 가 이루어졌고, 두 기기 모두에서 평가가 이루어진 경우는 78검 체였다. GPC에서 직접법의 종동정 일치율은 MicroScan 94.8%, Phoenix 80.7%, GNR에서는 각각 93.9%, 95.7%이었다. GPC 의 항균제감수성결과의 일치율은 MicroScan은 1,150 균주-항 균제조합에 대해 94.6%, Phoenix는 660조합에 대해 96.5%의 일치율을 보였고, 중대오류(very major error, VME)는 각각 1.1씩이었다. GNR은 MicroScan이 942조합에서 94.4%, Phoenix는 781조합에서 96.3%의 일치율을 나타냈고, VME는 각각 0.6%, 0% 등이었다. 기기간 직접법 종동정/항균제감수성결과를 비교할 때 Staphylococcus aureus 81.8%/98.0%, Escherichia coli 100.0%/95.6%가 일치하였다. 결론 : MicroSan은 GPC와 GNR의 종동정이 신뢰할 만 하 였고, Phoenix 직접법은 GNR에는 우수하였으나, GPC에 적용 하기는 어려웠다.

IPv6 네트워크에서 멀티캐스트 기반 이동성 제공 방안

우미애,전홍선,박호현,Woo Mi ae,Jun Hong sun,Park Ho hyun 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.4B

무선 통신 기술이 급속히 발전하면서 이동 중 데이터 통신이 가능하도록 하기 위한 연구가 활발하게 진행되고 있다. 특히, 실시간 응용 프로그램을 이동 단말에서 원활히 사용하기 위해서는 이동 단말의 이동성을 효율적으로 관리하는 것이 매우 중요하다. 본 논문에서는 IPv6 네트워크에서의 멀티캐스트 기반 이동성 제공 방안을 제안한다. 본 논문에서 제안한 방안은 이동 단말이 외부 도메인 내에서 서브넷 간 이동 시 멀티캐스트 그룹에 가입/탈퇴 함으로써 위치갱신을 하여 바인딩 갱신에 따른 신호를 지역 내에서 처리한다. 또한 확장된 멀티캐스트 그룹 관리 방안을 사용하여 그룹 탈퇴 지연을 최소화한다. 모의실험을 통하여 본 논문에서 제안한 방안이 Mobile IPv6와 Hierarchical Mobile IPv6 보다 UDP 및 TCP 성능과 대역폭 낭비도 개선함을 보였다. With rapid advance in wireless communication technologies, many researches are conducted for providing Internet data services while users are roaming around. Efficient management of mobility of mobile nodes is essential as the use of real-time application program grows. In this paper, we propose a multicast-based localized mobility support scheme in IPv6 networks. The proposed scheme utilizes a class of multicast routing protocol for the localized mobility support. Features of the proposed scheme are use of join to a multicast group and leave from that group to localize binding update information and provision of an extended multicast group management mechanism to reduce leave latency. The results of simulation show that the proposed scheme out-performs Mobile IPv6 and Hierarchical Mobile IPv6 in UDP and TCP traffic performance and in wasted bandwidth.

Effects of conditioned media from phosphatidylserine-liposome-treated macrophages on the differentiation of human dental pulp cells

박희철,전홍선,김용준,양형철 대한치과재료학회 2017 대한치과재료학회지 Vol.44 No.4

This study aimed to examine the effect of phosphatidylserine-treated macrophages (THP-1) on the differentiation of human dental pulp cells. Phosphatidylserine, phosphatidylcholine, and cholesterol were mixed at a molar ratio of 2:1:1, and liposomes were produced via the vacuum evaporation method. Conditioned media (CM) were collected after treating macrophages, with liposomes for 6 and 24h, and were used for differentiating human dental pulp cells. To confirm the differentiation, we performed an evaluation of alkaline phosphatase (ALP) activity, reverse transcriptase polymerase chain reaction (RT-PCR) of dentin sialophosphoprotein (DSPP) and osteocalcin (OCN) gene expressions, and extracellular matrix mineralization assay via alizarin red S staining. There was a statistically significant increase in alkaline phosphatase activity with the conditioned medium containing 10% in the overall culture medium. RT-PCR assay revealed that conditioned media did not increase the mRNA expressions of DSPP and OCN genes. The degree of matrix mineralization was not affected by the conditioned medium. These results confirm a slight effect of the conditioned medium on the differentiation of human dental pulp cells. Future studies may adopt a method in which macrophages and human dental pulp cells are closely co-existed, to evaluate the effect of phosphatidylserine on the interaction between these cell types

IPv6 네트워크에서 멀티캐스트 기반 이동성 제공 방안

우미애,전홍선,박호현 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.4

대변검체에서 vanA형 반코마이신 내성 장구균을 검출하기 위한 신속 증균 중합효소연쇄반응법 평가

김솔잎,성흥섭,전홍선,박숙자,박상혁,김미나 대한임상미생물학회 2007 Annals of clinical microbiology Vol.10 No.1

Background: Rapid and accurate surveillance is crucial in controlling vancomycin-resistant enterococci (VRE). Culture-based surveillance takes more than 4 days and direct polymerase chain reaction (PCR) is rapid but compromised by a low sensitivity. In this study, we evaluated the performance of an enrichment-PCR method for vanA VRE surveillance. Methods: In July 2006, 100 fecal specimens were inoculated to Enterococcosel agar (EA) and Enterococcosel broth (EB) containing 6μg/mL vancomycin. After 1 or 2 day-incubation bacterial pellets were obtained from 1 mL of blackened EB and VanA PCR were performed with DNA extract of the pellets (EB+PCR). Blackened EB were also subcultured on EA (EB+EA). Black colonies on EA were submitted to identification and antimicrobial susceptibility test and, if necessary, they were confirmed with vanA PCR. The electronic medical records were reviewed for previous history of colonization or infection of VRE. Results: A total of 59 specimens were positive for VRE by at least one method. VanA VRE was detected from 43, 54, and 53 specimens by EA, EB+PCR, and EB+EA, respectively; 54 EB+PCR positive specimens comprised 43 EA-positive, 7 EA-negative/EA+EB-positive and 4 EB+PCR-only-positive, and 11 EA-negative/EB+PCR-positive specimens were from the previous VRE-colonizers. The five EB+PCR-negative specimens were EB+EA-positive, suggesting false negativity, probably due to PCR inhibitors. The average turn-around time for EA was 88±35 h, whereas 98% of EB+PCR positive results were obtained at day 1. Conclusion: Enrichment in EB followed by PCR (EB+PCR) appears to be a rapid and sensitive method for the detection of vanA VRE in stool specimens. Internal control would be required to detect false negative results.

군용 항공기 체계개발을 위한 환경시험 적용방안 연구

여성구(Seonggu Yeo),최형준(Hyoungjun Choi),전홍선(Hongsun Chun) 항공우주시스템공학회 2018 항공우주시스템공학회 학술대회 발표집 Vol.2018 No.4