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양자 키 분배 프로토콜 BB84 와 B92 에서 도청률과 기저의 수에 따른 error rate 비교
이선아 ( Sun-ah Lee ),문봉교 ( Bong-kyo Moon ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
양자 암호통신에서는 키를 실시간으로 안전하게 분배하는 양자 키 분배방식이 핵심이다. 본 논문에서는 양자 키 분배 방식인 BB84 protocol 과 B92 protocol 을 python 으로 구현(이를 Lee’s code 라 명명)한다. 기존에 존재하는 양자 simulator 와 LEE’s code 를 이용해 error rate 의 차이를 두 가지 관점(기저에 따른 차이, 도청률에 따른 차이)에서 비교한다. 이를 바탕으로 어떤 protocol 이 도청자로부터 더 취약한지 알아본 결과, B92 protocol 의 QBER 이 항상 높으므로 도청자를 잡아내기는 쉽지만, 기저가 두 가지 밖에 없으므로 도청자의 공격에는 취약함을 알 수 있다.
진공포장한 한우와 홀스타인 도체 B₂및 D등급 냉장육의 품질특성
이교연,문윤희 慶星大學校 1998 論文集 Vol.19 No.2
This study was conducted to investigate the quality characteristics of vacuum-packaged and chilled beef. Four kinds of beef prepared from carcass grade B2, D of Korean native cow and Holstein. The physicochemical characteristics and palatability of beef loins were compared on the 30th day chilled with vacuum-package. The pH of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 5.74 and 5.92, Hostein beef B2, D grade were 5.71 and 5.83 by Korean native beef. D grade was highest. the lactic acid contents of Korean native beef B2, D grade were 295.30 and 290.63, Holstein beef B2, D grade were 307.33 and 369.02㎎/100g by Holstein beef D grade was highest. The hardness of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 109.12 and 165.42, Holstein beef B2, D grade were 105.27 and 167.15㎏/㎠ by Holstein beef B2 grade was lowest, and chewiness of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 187.11 and 213.62, Holstein beef B2, D grade were 111.38 and 207.62g by Holstein beef B2 grade was lowest, and myofibilar fragmentation index(MFI) were 68.27 and 65.27, Holstein beef B2, D grade were 77.47 and 69.40 by Hosstein beef B2 grade was highest. The inosine(Hx) of Korean native beef B2 D grade on the 30th day chilled with vacuum-package were 58.37% and 55.47%, Holstein beef B2, D grade 54.75% and 52.26% by Korean native beef B2 grade was highest, and those were increased compared on the 2nd day after slaughtering. the monounsaturated fatty acid(MUFA)/saturated fatty acid(SFA) ratios of Korean native beef were 1.48 and 1.32, Holstein beef 1.44 and 1.41 by Korean native beef B2 grade was highest, and B2 carcass grade were higher than D carcass grade. The cooking loss and cooking shortening ratios of Korean native beef B2, D grade on the 30th day chilled with vacuum-package were 15.41%, 14.70% and 19.51%, 26.61%, Holstein beef B2, D grade were 15.63%, 15.27% and 18.59%, 33.20% by Korean native beef B2 grade was lowest. The texture and palatability of cooked meat of on the 30th day chilled with vacuum-package were good in order Korean native beef B2 grade, Holstein beef B2 grade, Korean native beef D grade, and Hostein beef D grade.
李門浩,김종교 全北大學校 1981 論文集 Vol.23 No.-
The field radiated by any small linear antenna (=nondirectional antenna) is distributed uniformly. This type of radiated pattern is desirable for many broadcasting applications, but it is undesirable for point-to point and preferred coverage applications. The field strength can be increased in selected directions by appropriately exciting several antennas simultaneously. That is applications in which it is desired to radiate most of the energy in one direction, for example toward population city.
컴퓨터 시뮬레이션에 의한 밀링머시인의 精密度解析에 關한 硏究
李起卨,金敎亨,文鍾石 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.1
Relationship between geometric errors which are due to X,Y,Z axis motion in milling machine and workpiece error is analyzed and the Simulation program that can forecast volumetric error in the working space of machine tool is developed. If the simulation program in this study is utilized, the volumetric error can be compensated in working space of machine tool because volumetric error can be forecasted in advance of machining by this simulation program. It is considered that the simulation program developed in this study can be applied to numerical control to improve workpiece accuracy.
심교문,이정택,윤성호,황규홍 한국농림기상학회 2000 한국농림기상학회지 Vol.2 No.3
The northward shift of the cultivation region of winter barley has been considered because of consecutive warm winters from the middle of 1980's. There was 1.02℃ rise in mean air temperature during winter barley cropping season from 1975 to 1998. During this period, the maximum air temperature affected the mean air temperature rise rather than the minimum air temperature. The amount of mean precipitation was 513.3mm during winter barley cropping season from 1975 to 1998 and was least in 1992. Sunshine hours has increased little by little in the all regions except rural regions. The air temperature during winter barley cropping season from 1987 to 1999 in which the winter was warm was higher than the normal air temperature(1961∼1990). On the other hand, the air temperature during winter barley cropping season from 1974 through 1986 was similar to the normal air temperature. The amount of mean precipitation during winter barley cropping season from 1987 through 1999 was similar to the normal precipitation except April. During this period, the amount of mean precipitation of April was lower by 26mm than the normal year(1961∼1990). Sunshine hours during winter barley cropping season from 1987 to 1999 decreased generally in comparison with a normal year. Considering the air temperature rise during wintering from 1987 to 1998, it might be possible to extend the cropping area of winter barley northward.
심교문,이정택,이양수,김건엽 한국농림기상학회 2003 한국농림기상학회지 Vol.5 No.4
Recently, both climate change and unusual meteorological disasters are becoming a more frequent and serious threat to agricultural production. Destruction of the stabilizing base of agricultural productivity in Korea is a concern. This study provides basic information for stabilizing agricultural production by clarifying and analyzing the features of agro-meteorological disasters which have occurred recently in Korea. The occurrence of meteorological disasters has increased rapidly since the 1940s. A 19-fold increase in occurrence is noted over the past 60 years from 1941 to 2000. Meteorological disasters occurred mostly in August, then in July, and least often in October. In terms of regional occurrences, the frequency of meteorological disasters was the highest in Gangwon (751 times) and in Jeonnam (703 times) provinces, and the lowest in Jeju (459 times) province for the 97 years from 1904 to 2000. Agro-meteorological disasters which caused the most serious damage to cropland were rain storms and typhoons for the 10 years from 1991 to 2000, and they occurred 52 and 18 times during this period, respectively. Agro-meteorological disasters occurred mainly during the summer season (from June to September) when major crops are cultivated in Korea.