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WAVE 하드웨어 암호 라이브러리에 적합한 효율적인 AES-CCM 구조 설계
이연철,서화정,김호원,Lee, Yeon-Cheol,Seo, Hwa-Jeong,Kim, Ho-Won 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.12
차량에서의 무선통신의 발달과 함께 WAVE(Wireless access in vehicular environments) 상에서도 보안에 대한 위험성이 증가하였다. 이를 위해 IEEE 1609.2로 스누핑, 도청과 같은 공격으로부터 메시지를 보호하기 위한 보안 서비스를 규정하였다. 이를 보안 라이브러리를 하드웨어 형태로 구현 가능하며 본 논문에서는 이에 적합한 AES-CCM 구조를 설계하였다. 동일 FPGA에서 비교 논문의 구조와 비교하여 27 % 적은 slice를 사용하였으며 기존 라이브러리모듈에서 레지스터를 공유하였을 경우를 고려하면 약 45 % 적은 slice를 사용한다. 또한 xc5vlx110t-2ff1136 상에서 1355 Gbits/s의 처리량을 보인다. According to developing wireless communications in vehicle, various security threat in the WAVE(Wireless access in vehicular environments) is increased. To protect this, IEEE 1609.2 specify services as for prevent message from attacks such as spoofing, eavesdropping and replay. It is possible to implement a hardware library for defending these attacks. In this paper, we proposed a efficient AES-CCM architecture for the hardware library in the WAVE. We compare our architecture to the previous one in the same FPGA. And our design uses less slices than 27 % of it and less slices than 45 % of it if we share registers that were used by other modules in the library. We also achieves a throughput of 1355 Gbits/s in xc5vlx110t-2ff1136.
칼라와 움직임 정보를 이용한 움직이는 얼굴 영역 검출 방법
이연철(Yeon-Chul Lee),김은이(Eun-Yi Kim),박상용(Sang-Yong Bak),황상원(Sang-Won Hwang),김항준(Hang-Joon Kim) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅱ
본 논문은 카메라의 움직임이 있는 영상에서 움직이는 사람의 얼굴을 검출하는 방법을 제안한다. 제안된 방법에서, 얼굴 영역을 찾기 위해 피부 색깔 정보와 움직임 정보를 이용한다. 카메라의 움직임을 어파인 모션 모델(Affine Motion Model)을 이용해 제거한 후, 적응적 임계치(adaptive thresholding)를 통해 얻어진 움직임 영역 내에서만 피부 색깔 모델(skin color model)을 이용해 얼굴 영역을 검출한다. 제안된 방법은 시간에 따라 조명이 변하거나 잡음이 포함된 영상에서도 좋은 결과를 얻을 수 있다.
자기통제 결과지식이 무릎 관절의 열린 사슬 자세와 닫힌 사슬 자세의 고유수용성감각의 장·단기적 학습에 미치는 영향
이연철 ( Yoen Chul Lee ),이상열 ( Sang Yeol Lee ),박관용 ( Kwan Yong Park ) 대한물리의학회 2009 대한물리의학회지 Vol.4 No.2
Purpose:The purpose of this study was to examine the effects of self-controlled knowledge of result (KR) versus the yoked KR on learning of knee joint proprioception. Methods:Forty volunteer subjects (20 men and 20 women) were randomly assigned to each four groups: 1) self-controlled KR in open kinematic chain, 2) yoked KR in open kinematic chain, 3) self controlled KR in close kinematic chain, and 4) yoked KR in close kinematic chain. The difference between the angle of position and reproduction angle was determined as a proprioception error and measured using an angle reproduction test. The subjects in self-controlled groups were provided with feedback whenever they requested it, whereas the subjects in yoked groups were not provided with feedback. The data were analyzed using a one-way ANOVA. Results:The proprioception errors in close kinematic chain groups decreased significantly compared with those in close kinematic chain groups(p<.05). The proprioception errors in the self-controlled group decreased significantly compared with those in yoked groups during acquisition and retention test(p<.05). Conclusion:Self-controlled knowledge of result during open kinematic chain movement is considered to be a good method on motor learning.
이연노,주남철 대한건축학회 2004 대한건축학회논문집 Vol.20 No.12
This thesis mainly deals with the Gaeksa architecture of early Joseon dynasty with the survey of documentary records The Gaeksa is a typical complex which combined with several buildings such as Jeongcheong, Ikheon and so on Each building has special purpose of their own Jeongcheong is a place for the national ceremony and Ikheon is a place for the rest of envoy All the town of Joseon had the Gaeksa in the center of their town But now most of the Gaeksa were destroyed and disappeared These conditions made no more progress in studies with the Gaeksa So this study focused on how they were made and how they were used in early Joseon dynasty As a result, the uses of the Gaeksa of early Joseon dynasty shows very diverse aspects And the impotance of the Gaeksa in early Joseon dynasty was reduced in symbolical and functional purpose compare to that of late Joseon dynasty
Upcycling of lignin waste to activated carbon for supercapacitor electrode and organic adsorbent
이연기,정상철,황상엽,이성호,엄광섭,홍승빈,박관규,김병주,이정준,조한익 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.9
We introduce a facile strategy to upcycle lignin waste to valuable activated carbon (AC). Unlike conventional preparation processes of AC, such as high-temperature carbonization above 600 oC followed by chemical or physical activation, we synthesized AC through low-carbonization (~300 oC), ball-milling, and thermal activation. Lowtemperature carbonization effectively led to the formation of the micro-pores and simultaneously high yield. Uniform activated morphology of char lignin is achieved through a ball-milling process. The as-synthesized AC exhibited a large specific surface area of 1075.18m2 g−1, high specific capacitance of 115.1 F g−1, and excellent adsorbability of 0.23 gtoluene per gactivated carbon. Therefore, we believe that the presented facile strategy could lead to the realization of upcycling of lignin waste to highly useful AC.
高麗末 朝鮮初 多包建築 공포의 結構 特性에 관한 硏究 : 공포와 보의 結構를 中心으로
李演魯,朱南哲 대한건축학회 2003 대한건축학회논문집 Vol.19 No.8
This study mainly deals with what the constructive traits of Dapo(多包:a type of buildings which have intercolumnar wooden brackets) building's Kongpoes(공포:wooden bracket) are from late Koryo(高麗) to early Chosun(朝鮮) dynasty. Comparing to the building of other periods, the methods, constructing Kongpoes(공포) makes too many diverse aspects. The numbers of Chulmok(出目) are same between inner and outer part. The heads of beams(보머리) were extruded from Kongpo, and these were shaped typical figure, Sambundu(三分頭; beam head shaped triple cut). The beams were constructed by Chumchaes(첨차; wooden bracket arm) in inner and outer part of Chulmoks. All the Jangyeoes(장여; a timber which supports pullin) and Gabanjangyeoes(가반장여; a Jangyeo didn't support pullin but constructed in the regardless of location. Others didn't, height made by inner part of Chulmok was higher than outer. As for the use of Dori(道里;pullin), they didn't use Jusimdori(柱心道里:pullin located on the column line) but Nemokdori(內目道里;pullin located on the inner part of column line). Sungbulsa(成佛寺) Ungjinjun(鷹眞殿) and Simwonsa(心源寺) Bokwaghun(普光殿) especially used Ungongs(雲工) which support Oimokdori(外目道里:pullin located on the outer part of column line) on the head of beam. And, Sukwangsa(釋王寺) Ungjinjun(鷹眞殿), Seoul Sungryemun(崇禮門), and Bongjungsa(鳳停寺) Daewungjun(大雄殿) didn't use Umgomg in the Juganpo(柱間包: wooden bracket located on the intercolumnar part). That looks like trait of this period.