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고속 RFID 필터링 엔진의 설계와 캐쉬 기반 성능 향상
박현성,김종덕,Park Hyun-Sung,Kim Jong-Deok 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.5a
본 논문은 다수의 RFID 태그가 사용되고 있는 환경에서 고속 필터링을 수행하기 위한 필터링 엔진을 설계한다. 이를 위하여 우리는 고속 라우터나 방화벽에 적용되었던 고속 패킷 필터링 기법이 RFID 데이터 필터링과 매우 유사함을 보이고 그 중 대표적인 기법인 Bit Parallelism 기반의 Aggregated Bit Vector(ABV)를 고속 RFID 필터링 엔진에 적용한다. 또한, RFID 데이터 필터링의 성향을 관찰한 결과 태그 인식 및 필터 부합의 시간적 중복성을 발견하고 두 가지 캐쉬(태그 캐쉬, 필터 캐쉬)를 적용하여 추가적인 필터링 성능 향상을 꾀하였다. 설계한 RFID 고속 필터링 엔진의 성능 평가를 위해 프로토타입 애플리케이션을 제작하여 시뮬레이션을 수행하였다. 결과로써 기존의 순차적인 RFID 데이터 필터링에 비해 고속의 필터링 성능을 보이며 특히 필터의 수가 증가할수록 필터링의 효율이 높아짐을 보인다. In this paper, we present a high-speed RFID data filtering engine designed to carry out filtering under the conditions of massive data and massive filters. We discovered that the high-speed RFID data filtering technique is very similar to the high-speed packet classification technique which is used in high-speed routers and firewall systems. Actually, our filtering engine is designed based on existing packet classification algorithms, Bit Parallelism and Aggregated Bit Vector(ABV). In addition, we also discovered that there are strong temporal relations and redundancy in the RFID data filtering operations. We incorporated two kinds of caches, tag and filter caches, to make use of this characteristic to improve the efficiency of the filtering engine. The performance of the proposed engine has been examined by implementing a prototype system and testing it. Compared to the basic sequential filter comparison approach, our engine shows much better performance, and it gets better as the number of filters increases.
박현성,김도영,김수정,정혜림,조현수,장지은,정준원,민유홍,송재우,김진석 대한암학회 2018 Cancer Research and Treatment Vol.50 No.4
Purpose Although hepatitis B surface antigen (HBsAg)–negative, hepatitis B core antibody (anti-HBc)– negative patients are not considered to be at risk for hepatitis B virus (HBV)–related hepatitis, the actual risk remains to be elucidated. This study aimed to evaluate the risk of HBV-related hepatitis in HBsAg-negative, anti-HBc–negative patients receiving autologous stem cell transplantation (ASCT) for multiple myeloma (MM) or malignant lymphoma. Materials and Methods We retrospectively reviewed data from 271 HBsAg-negative patients (161 anti-HBc–negative and 110 anti-HBc–positive at the time of ASCT) who received ASCT for MM or lymphoma. The risk of HBV-related hepatitis was analyzed according to the presence of anti-HBc. HBV serology results at the time of ASCT were compared with those at the time of diagnosis of MM or lymphoma. Results Three patients (two anti-HBc–negative MMs and one anti-HBc–positive MM) developed HBV-related hepatitis after ASCT. The rate of HBV-related hepatitis did not differ among patients with or without anti-HBc status (p=0.843). HBV-related hepatitis more frequently occurred in MM patients than in lymphoma patients (p=0.041). Overall, 9.1% of patients (16.7% with MM and 5.4% with lymphoma) who were HBsAg–negative and anti-HBc–positive at the time of diagnosis had lost anti-HBc positivity during chemotherapy prior to ASCT. Conclusion Our data suggest that HBsAg-negative, anti-HBc–negative patients at the time of ASCT for MM or lymphoma still might be at a risk for HBV-related hepatitis.