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900MHz RFID 표준 프로토콜(ISO/IEC 18000-6 type B)에서의 충돌방지 성능 개선
권대근,김완진,김형남,Kwon Dae-Ken,Kim Wan-Jin,Kim Hyoung-Nam 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.5C
본 논문에서는 900 MHz RFID 표준 프로토콜 중 하나인 ISO/IEC 18000-6 type B 프로토콜의 충돌방지 알고리즘의 성능을 분석하고, 이에 대한 성능 향상 방법을 제안한다. 제안된 방법은 ISO/IEC 18000-6 type B 프로토콜의 충돌방지 알고리즘에서 명령 전송 횟수 및 전송 데이터의 양을 줄임으로써 태그 인식 속도를 개선한다. 시뮬레이션 결과를 통해 제안된 방법이 리더 인식 영역 내의 태그 개수와 관계없이 태그 인식 속도를 기존 방법에 비해 21.7% 향상시킬 수 있음을 보인다. This paper proposes a novel anti-collision method for the ISO/IEC 18000-6 type B protocol which is the standard protocol of the 900 MHz RFID system. We improve the anti-collision performance by reducing the transmission number of commands and the length of bits required for multi-tag identification in the ISO/IEC 18000-6 type B protocol. Simulation results show that the proposed method improves the multi-tag identification time by 21.7% over the conventional method, irrespective of number of tags.
사례 분석을 통한 국내 장수명 주택 활성화 방안에 관한 연구 - 저해요인 분석 중심으로 -
권대근,심운준,형원길 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.4
본 연구의 목적은 해외사례 분석을 통하여 국내 장수명 주택의 활성화를 위한 방안을 모색하고자 한다. 문헌 및 사 례 분석, 전문가의 인터뷰를 통하여 활성화 저해요인을 도출하였고, AHP기법을 이용하여 주요 저해요인을 선정하 였다. 선정된 주요 저해요인을 중심으로 활성화 방안을 제시하였다. 주요 저해요인은 장수명 주택의 보급을 위한 정부의 지원 및 홍보 부족(0.099), 조세 및 금융상의 지원대책 미흡(0.091), 주택을 주거보단 투자를 위한 재화수단으로 여기는 인식(0.087), 신기술 개발 및 도입을 위한 경제적 지원 미흡(0.083) 등의 순으로 도출되었으며, 이는 향후 국내 장수명 주택 활성화를 위한 기초자료가 될 것으로 사 료된다. The purpose of this study is to seek plans for encouraging domestic long-life housing by analyzing foreign cases. Reference and case analyses, as well as expert interviews were performed to deduct impediments, and AHP method was used for selecting major impediments. Based on selected major impediments, activation plans were suggested. Major impediments were deducted in order of; lack of governmental support and PR activities for long-life housing supply (0.099), insufficient supporting measures for taxation and finance (0.091), Consideration of housing as means of money for investment than dwelling (0.087), and inadequate economical support for new technology development and introduction (0.083). These are considered to be base data for encouraging domestic long-life housing in the future.
권대근 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.4
The factors related to relapse in 20 skeletal class III patients who performed two-jaw surgery with Le Fort I maxillary osteotomy and bilateral sagittal split ramus osteotomy was investigated. All patients were fixed with miniplate on the maxilla and three screws at each mandible. Cephalograms taken at preoperative, immediate postoperative and 8 months postoperative after surgery were traced and digitized. 1.The horizontal and vertical relapse of maxilla and mandibular chin points was within 1mm postoperatively. Compare to the preceding report concerning the mandibular set-back surgery only group, this reveals two-jaw surgery for mandibular prognathism using rigid fixation is more stable. 2.Although there was no significant relapse tendancy was observed at chin points, the screw tip land-marks moves anterio-superiorly and each side of the screws moved as a one unit. The screw tip points moved similar direction to the masticatory force and this movements might be influenced by the muscular tension to the distal segment of the mandible. 3.According to the regression analysis, the amount of horizontal and vertical movement of mandibular set-back influenced the mandibular relapse. However, direction and amount of maxillary surgical movement did not inf1uenced the maxillary and mandibular relapse.
Antioxidative Effect of CLA Diet and Endurance Training in Liver and Skeletal Muscles of Rat
권대근,김진우,조강옥,송영주 한국생물공학회 2017 Biotechnology and Bioprocess Engineering Vol.22 No.5
The purpose of this study is to investigate the effects of conjugated linoleic acid (CLA) supplementation and endurance exercise on the oxidative/anti-oxidative status in rat liver and skeletal muscles. Sprague-Dawley male rats were randomly divided into HS (high-fat diet sedentary group, n = 8), CS group (CLA supplemented sedentary group, n = 8), and CE group (CLA supplemented exercise group, n = 8). For CLA supplementation, 1.0% CLA was substituted for dietary fat. For endurance exercise, the rats swam for 60 min a day, 5 days a week for 8 weeks. The MDA content, Cu, Zn-SOD and Mn-SOD expression in the soleus muscle (SOM) of the CE group improved significantly compared to the HS (p < 0.01) and CS groups (p < 0.05). Moreover, Mn-SOD expression in both the SOM and extensor digitorum longus muscle (EDL) of the CS were enhanced significantly compared to the HS (p < 0.05). From these results, it was suggested that CLA supplementation under the endurance exercise condition may improve the oxidative status by decreasing the MDA content via potential scavenging of Cu,Zn-SOD, and Mn-SOD protein in red muscle, respectively. Therefore, our study demonstrated long-term endurance exercise with CLA supplementation plays a crucial role for maintenance of antioxidative properties in the skeletal muscle of rat.