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서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
MgCl₂溶液內에서 STS 304 HP Stainless Steel 熔接部의 破壞擧動에 對한 硏究
金永奭,丁太權,朴昌彦,洪錫柱,梁仁榮,金基玉,朴煥奎,李茂錫,曺圭宰,鄭在康 조선대학교 생산기술연구소 1983 生産技術硏究 Vol.1983 No.-
This paper is based on an experiment analysing the stress corrosion cracking behaviour of welding specimens compared to that of non-welding specimens of STS 304 HP stainless steel in corrosion solution. As a corrosion condition, stainless steel has been known to be the most fragile in a solution of 42% MgCl₂heated to the boiling point, therefore the experiment was carried out in this condition. The experiment was carried out with argon gas TIG welding specimens and non-welding ones made of stainless steel plates, thickness 2mm, by tensile force. At this time, the tensile force was taken to be the value of the yield strength of the tensile test specimens divided by the safety factor of 3.0 to 3.5, 4.0, 4.5, and 5.0. In this paper, the relations between Time of Initial Crack, Time of Failure, Time of Final Fracture and Crack Propagation Length were investigated and then plotted. Furthermore, the relations between Stress Intensity Factor K proposed by Irwin and the Time of Initial Crack, the Time of Failure, the Time of Final Fracture were calculated and plotted. At the last, all the relations plotted were expressed to normal equations by computer, and the equations were used to analyse the data obtained in the experiment. The conclusions obtained in this study are as follows: 1. Welding materials, compared with non-welding ones, as the Time of Initial Crack, the Time of Failure, and the Time of Final Fracture were generally very fast, appeared to be a phenomenon of unstable brittleness fracture. 2. Non-welding materials, compared with welding ones, as the safety factor was larger or the working stress was smaller, appeared to be a phenomenon that the longer had had greater durability. Therefor, welding materials must be considered enough to be used in heate affected and stress corrosion atmosphere. 3. The normal equations of the Time of Initial Crack and the variation rate to the same Stress Intensity Factor K are as follows: (A) Non-welding T =259702.4-5451.2 K+28.386 K² T = -5451.2+28.386 K (B) Welding T= -332.693+28.043 K-0.211 K² T' =28.043-0.211 K here, T; Time of Initial Crack, T'; Variation Rate of Time of Initial Crack to Stress Intensity Factor K, K ; Stress Intensity Factor.
Study on Aging Effect of Adhesion Strength Between Polyimide Film and Copper Layer
Seok‑Bon Koo,Chang‑Myeon Lee,Sang‑Jun Kwon,Jun‑Mi Jeon,Jin‑young Hur,Hong‑Kee Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1
This paper experimentally confirmed that the adhesion strength of the copper layer formed on the surface of the polyimidefilm by wet plating greatly changes with the aging time. The adhesion strength of the copper layer showed a rapid increasefrom 4 to 10 h after aging had begun and then converged to a value without a significant change. The adhesion enhancementbetween polyimide film and copper layer by aging is due to the interlocking effect caused by the volume expansion of copperoxide (CuO) formed in the polyimide, the increased mobility of copper particles enlarged by the decrease of impuritiesin the copper layer grain boundaries, and the consequent change of the crystal structure of the copper layer leading to theinternal stress reduction. Such adhesion improvement can be confirmed by the progress of the cohesive failure indicatingthe breakdown of the polyimide film.
디지털 영상의 SNR을 고려한 템플리트 매칭 방법의 신뢰성 향상에 관한 연구
홍종원,오영석 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-
In the template matching, correlation coefficient has been frequently used to measure the similarity of gray-scale images. It is one of an important matching procedure to select a template of good quality which has influence on matching result. A template of good quality, which is generally distinguished by the naked eye, is not always successful in template matching experiment. To solve this problem, we introduce a SNR(signal-to-noise ratio) of template to compare templates each other and relates a SNR of template with correlation coefficient. From this compare templates each other and relates a SNR of tem plate with correlation coefficient. From this relation, we explain how to determine a threshold correlation coefficient that is to know whether a object exists or not and introduce method to measure a SNR of template. Subsequently, we show the fact that confidence of template matching method considering a SNR of template is improved.
홍영기,이재신,김순석,김성권 중앙대학교 정보통신연구소 1999 정보통신연구소논문집 Vol.1 No.1
정보화 시대에 세계적으로 컴퓨터의 보급 및 네트워크의 발달로 컴퓨터 응용분야에서 많은 발전이 이루어지고 있다. 그 중에서도 암호학을 이용한 전자투표는 전자화 되어 가는 민주 사회에서 필요한 요소로 부각되고 있다. 그러나 지금까지의 전자 투표는 중요성에도 불구하고 많은 문제점이 지적되었다. 본 논문에서는 추적할 수 없는 통신망[1]과 신뢰할 수 있는 선거관리센터를 가정함으로써 전자 투표의 요구사항인 안전성, 공정성, 투표자의 비밀성, 선거 집계의 정확성 등을 만족하는 대규모적이고 실용적인 전자투표 프로토콜을 제안한다. 블라인딩기법(Blinding Technique)을 이용하여 투표자의 투표내용을 노출시키지 않고 투표권을 획득하며, 부정할 수 없는 도전 및 응답프로토콜(Challenge and Responsible Protocol)을 사용하여 투표자와 집계자 사이의 부정을 확인할 수 있으며, 투표자나 집계자의 부정으로 인한 전자 투표의 무결성과 투표자의 프라이버시를 보호하기 위해 투표자의 익명을 기반으로 안전한 전자투표를 방식을 제안한다. We have seen a lot of developments on computer application areas with the wide spread use of computers and the rapid growth of communication network. It is necessary to use a cryptographic technique for electronic voting, but, at present, despite of its importance electronic voting protocols so far have many shortcomings. In this paper, with the assumption of untraceable communication channels and trustable voting centers we propose a large-scale and practical electronic voting protocol satisfying protocol requirements, such as secureness, fairness, privacy of voter and correctness. Voters are able to get a vote without revealing their voted information by using the blinding technique. We can find the injustice between a voter and the tallier by using undeniable challenge and responsible protocol. Also, we proposes a secure protocol that compensates a integrity of electronic voting and protects a privacy of voter from outer attacks as using a anonymity of voter.
홍성규,어영준,서대석 건국대학교 1995 學術誌 Vol.39 No.1
This study is aimed to identify effects of import liberalization of chicken products not only on agriculture but also on national economy overall. The extending influences on production and income are generally measured using input-output analysis tool. But the reaction induced by import liberalization of chicken products would not be considered in the open static input-output-model, far example multiplicator effects between income and consumption. In order to overcome the defect of the open static input-output-model, the open static Leontief-model is extended to the income-consumption relation in measuring the extended effects of the import liberalization of chicken products. This study is undertaken using the results of KREI(Jan. 1994) which concluded that the direct losses in agriculture from 1995 to 2001 could be 113 billion won at the constant price of 1990. It was calculated that the indirect production losses of the other related industries could be 165 billion won, and 246 billion won in the view of income-consumption relation. It was also predicted that the indirect income losses of the other related industries would be 89 billion won, and 126 billion won in the view of income-consumption relation. As a result import liberalization of chicken products could possibly bring about larger losses to the other industries than to agriculture. Especially, in the "Other flood preparations" sector, the indirectly largest loses could predict to be occured.