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가시적 격자점 문제를 이용한 안드로이드 잠금 패턴 가짓수의 상계와 하계 범위 개선
김현호,정성재,송상헌 한국과학영재교육학회 2019 과학영재교육 Vol.11 No.3
In larger than grid, the number of Android locking pattern to solve using full search is hard. In this study, the Visible Grid point Problem is applied to obtain a possible number of patterns. This problem will be expanded. In original, Visible Grid Point Problem have been studied with infinite grid, while in this study, it extends to finite grid. With reference to the process of solving ratio of visible points of arbitrary point in infinite grid, , we solved the ratio of visible points to arbitrary point in the finite plane. However, it is difficult to obtain the accurate ratio of visible points to arbitrary point in the finite plane. Thus, by calculating the upper bound and lower bound of this ratio, we obtained the upper bound and lower bound of the numbers of the Android locking patterns’ possible parameters to see the approximate range of the possible parameters. So, all of upper bounds are improved. 격자 평면 위 임의의 점에서 다른 점을 볼 수 있는 비율은 이라는 가시적 격자점 문제는 무한 격자 평면에 기반을 둔 것이다. 하지만 이상 의 유한 격자 평면에서는 경우의 수(전체탐색법)만으로 그 가짓수를 모두 구하는 것은 어렵다. 본 연구는 선행연구들을 바탕으로 유한 격자 평면으로 국한할 때의 안드로이드 잠금 패턴의 가짓수 범위(상계와 하계)를 구하는 알고리즘을 개발하였다. 특히 좌표평면 위 점의 위치에 따른 가시적 격자점 비율의 상계와 하계를 미지수화하여 경우의 수에 따라 세분화하면서 공식화하였다. 이 공식을 바탕으로 Python Coding으로는 오버플로가 발생하지 않는 범위(13×13 격자판) 내에서 일부의 하계 값과 대부분의 상계 값을 개선시켰다. 이 연구는 Lee(2017)가 제시하였던 가시성에 기반하지 않은 연구에서의 알고리즘을 발전시켰고 최승훈 (2017)이 제안한 가시성에 기반한 연구와 Goodrich, et, al. (2018)과는 Visible Grid Point Problem에 공통점이 있다. 그러나 이들의 연구 결과값을 일부 개선했던 정성재, 김현호, 송상헌(2018)과도 상계와 하계를 구하려는 목적은 같으나 이를 구하는 과정과 방법에 차이가 있다.
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김현호 한국전략문제연구소 1996 전략연구 Vol.3 No.2
Since the 1990's, North Korean refugees have been under great international interest due to their growing number. Also the escape movement is seen as closely related to the overall crisis that North Korea is currently facing. Some even compare it to that of the East Germans shortly before the downfall of the Berlin Wall. The escape of North Koreans should be observed with Korean Government's reunification policy. It is clearly not the simple matter of human rights. About 1,500 North Korean refugees are wandering in China and Russia. The Korean goverment sees that about 700 of them wish to move to South Korea. However, the exact number is unknown. The size has been suddenly increased during 1990~1993. The North Korean government has strengthened the boarder line watch since. The number has been decreased because the refugees were unsure about their safety. Currently, the annual number of refugees is not over some hundreds. The refugees are not active in anti-North Korean movement since it is impossible for them to act out in the open. The reform of Russia and China was in its height in the late 80's and early 90's. Naturally, it worked as an incentive to the massive escape. At the same time, as Korea expanded its diplomatical realtionship with China as well as Russia, Many North Koreans became aware of the South and they began to consider Korea as a place of refuge. North Korean economy has suffered a great deal in the 90's. Ecomomic difficulty is the main fundamantal factor of the refuge. The growing number of refugees especially in the 3rd countries has begun to act as a great burden in North Korean foreign policies. Therefore, the government become coersive which resulted in the increase of the refugees. North Korea may turn to economical reform. However, with the current size of refugees, it is yet hardly a threat to the regime. The size as well as the character of North Korean escapees are quite different from that of East German. From 1949 to the early half of the 90's about 5.2 million East Germans moved to the West. It was not difficult for East Germans to move out Some even moved out legally. The present North Korean refugees are risking their lives to cross the border. Korean Government's policy toward the refugees has always been impromtu. Or it has been just a talk without any principle. There has been a total of 80 submissions to the South since 1993 which takes up 10% of the overall number. Now is clearly the time for the government to come up with fundamental and comprehensive measures.
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김현호,윤덕상,박영춘,백승우,손승완,인민식 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.10
Background : Boxthorn (Lycium chinense M. 2 n = 24) is a self-incompatibility crop of solanales. It can not be fertilized in the cultivation of single cultivars. Therefore it is necessary to select proper pollinizer. We selsected good line, Cheongyang 26, with Anthracnose-resistant and high yield. This experiment was carried out to select proper pollinizer through researching self-incompatible and Cross-compatibility. Methods and Results : The self-incompatibility test of Cheongyang 26 was investigated fertilization rate and fruit Characteristics by artificial selfing fertilization. Investigation of fertilization rate and fruit characteristics by artificial fertilization was carried out to test cross-compatibility of Cheongyang 26 with Cheongwoon, Hokwang, Cheongdang, Cheonghong, Cheongkwang and Cheonggeum. Self-fertilization rate of Cheongyang 26 was 19.3%, self-incompatibility. In flowering period, Cheongkwang, Cheonghong, Hokwang, Cheongyang 26 and Cheongdang were early. The fertilization rate of Cheongkwang, Cheonggeum, Cheongwoon, Hokwang and Cheongdang in order was high when Cheongyang 26 was bred as seed parent. The fertilization rate of Cheonggeum, Hokwang, Cheongwoon and Cheongdang in order was high when Cheongyang 26 was bred as pollen parent. Cross-compatibility of Cheongyang 26 and Cheonghong was very low because of inbreeding. Anthracnose on fruits in open field was strong in Cheongyang 26, Cheonghong and Cheonggeum. The infection rates on leaves to Eriophys macrodonis Keifer was high in Cheongyang 26 and Cheongwoon. Conclusion : The proper pollinizer of Cheongyang 26 in open field was Cheonggeum when considering flowering period, cross-compatibility, Anthracnose and Eriophys macrodonis Keifer. In rain-shelter plastic greenhouse, the proper pollinizer of Cheongyang 26 was Cheongwoon because it’s able to prevent Anthracnose in rain-shelter plastic greenhouse.
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