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굴패각 및 산업 부산물을 재활용한 투수 콘크리트에 관한 기초 특성 연구
이상현,이상현,하상훈,어석홍 한국산업융합학회 2025 한국산업융합학회 논문집 Vol.28 No.1
In this paper, compressive strength, bending strength, slump, internal porosity, and permeability coefficient tests were conducted to analyze the basic characteristics of pervious concrete recycled from oyster shells and blast furnace slag fine powder and ferro-nickel slag which are industrial by-products. The compressive strength, internal porosity, and permeability coefficient were tested using 81 specimens of ∅100 × 200mm size. The slump test was conducted 18 times with divided into two parts, immediately after mixing and after 1 hour. As a result of the experiment, the effect of improving long-term strength according to the replacement ratio of blast furnace slag fine powder to the cement weight was small. And the compressive strength and bending strength showed a decrease depending on the replacement ratio of the oyster shell to the weight of fine aggregate, but the internal porosity and permeability coefficient showed an increase. Test results showed that permeable concrete recycled from oyster shells and industrial by-products met the Korea Public Procurement Service’s permeable concrete standards of basic properties and the Seoul Metropolitan Government’s permeable performance standards. Therefore, industrial by-products and oyster shells in permeable concrete can be an effective way to solve environmental problems and natural aggregate collection problems, but additional research on freeze-thaw resistance and economic feasibility is considered necessary.
이상현,이상준,문경일,조성의 한국IT서비스학회 2009 한국IT서비스학회지 Vol.8 No.4
Objectifying claims filed during the warranty period, analyzing the current circumstances and improving on the problem in question is an activity worth doing that could reduce the likelihood of claims to occur, cut down on the costs, and enhance the corporate image of the manufacturer. Existing analyses of claims are confronted with two problems. First, you can’t precisely assess the risks of claims involved by means of the value of claims per 100 products alone. Second, even in a normal state, the existing approach fails to capture the probabilistic conflicts that escape the upper control limit of claims, thus leading to wrong control activities. 1 이상현·이상준·문경일·조성의 To solve the first problem, this paper proposed that a time series detection concept where the claim rate is monitored based on the date when problems are processed and a hazard function for expression of the claim rate be utilized. For the second problem, this paper designed a model whereby to define a normal state by making use of PID (Proportion, Integral, Differential) and infer by way of a fuzzy concept. This paper confirmed the validity and applicability of the proposed approach by applying methods suggested in the actual past data of warranty claims of a large-scaled automotive firm, unlike hypothetical simulation data, in order to apply them directly in industrial job sites, as well as making theoretical suggestions for analysis of claims.
사이버 위협에 대한 일본의 대응: 사이버 외교와 사이버 방위
이상현 세종연구소 2019 국가전략 Vol.25 No.2
Confrontations among states are increasingly on the rise in diplomatic and military superiority in the fields of space and cyberspace. Japan, which is an advanced IT country, is making every effort to respond to such issues as establishing basic laws and preparing strategies to adapt to the rapidly changing global cyber security environment. This paper examines the process in which the cyber security strategy of neighboring Japan is embodied in the field of diplomacy and defense, and aims to draw implications for the cyber security strategy of Korea. In promoting cyber diplomacy, Japan is focusing on spreading the norms of the Western countries, promoting confidence building, and supporting capacity building of the developing countries. In particular, Japan, with its identity as a member of advanced countries in the West, is leading the discussion on cyberspace using the G7, a group of Western developed countries, and has been carrying out various programs to strengthen capacity building around ASEAN countries. The new National Defense Program Guidelines announced in 2018 puts the defense capability of advanced military areas such as space and cyber in front. In addition, in April 2019, the Foreign and Defense Ministers of the two countries showed that the US-Japan alliance is being expanded into the advanced military area by clarifying that the US-Japan Security Treaty Article 5 can be applied to cyber attacks against Japan. Japan's leading response to the cyber threat suggests a lot to Korea. In the future, Korea should positively examine the use of MIKTA, the strengthening of capacity for ASEAN, the establishment of a department dedicated to cyber diplomacy, the resumption of the Korea-Japan Cyber dialogue, and the strengthening of the ROK-US alliance in cyberspace. 우주와 사이버로 대표되는 첨단 기술 분야에서 외교적 군사적 우위를 점하기 위한 국가간 대결 양상은 갈수록 치열해 지고 있다. IT선진국인 일본 또한 급변하는 글로벌 사이버 안보환경에 적응하기 위해 기본법을 제정하고 전략을 마련하는 등 대응에 총력을 기울이고 있다. 이 글에서는 이웃나라 일본의 사이버 안보 전략이 외교와 국방의 영역에서 구체화되어 가는 과정을 검토하고 이것이 한국의 사이버안보 전략에 주는 함의를 도출하고자 하였다. 일본은 사이버 외교를 추진함에 있어 서방진영의 규범인식 확산, 신뢰구축 추진, 역량강화 지원 등의 분야에 집중하고 있다. 특히 서방선진국의 일원이라는 정체성을 가진 일본은 서방선진국 그룹인 G7을 활용하여 사이버공간에 대한 규범논의를 주도해 나가고 있으며, ASEAN 국가들을 중심으로 한 역량강화지원 사업을 다방면에 걸쳐 실시하고 있다. 2018년에 발표된 新방위대강은 우주, 사이버 등 첨단 군사영역의 방위력 강화를 전면에 내세웠으며, 2019년 4월 미일양국의 외교·국방장관은 일본에 대한 사이버 공격에 대해서도 미일안보조약 5조가 적용될 수 있음을 분명히 함으로써 미일동맹이 첨단 군사영역으로 확대 강화되고 있음을 보여주었다. 사이버위협에 대한 일본의 선도적 대응은 우리에게 많은 점을 시사해 준다. 향후 한국은 중견국 협의체인 믹타(MIKTA)의 적극적 활용, ASEAN에 대한 역량강화지원, 사이버외교 전담 부서 설치, 한일 사이버대화의 조속한 재개, 사이버 안보영역에서의 한미동맹 강화 등을 적극적으로 검토해 나가야 한다.
박테리오신 leucocin A를 생산하는 Saccharomyces serevisiae 세포의 제작
이상현 한국생명과학회 2003 생명과학회지 Vol.13 No.5
In order to establish yeast cells that produce leucocin A, a bacteriocin, the 117 bp leucocin A gene with start and stop codons was synthesized and cloned in pAUR123, a yeast vector. Transformed yeast cells showed antibacterial activity against Bacillus subtilis. The leucocin A gene was confirmed by means of PCR methods with plasmid prepared from transformed yeast cells as template and two leucocin A-specific primers. In this results, yeast cells that produce mass amounts of bacteriocin to use as food preservative or antibiotics were established.
온라인 학습 환경에서의 블록형 교육용 프로그래밍 도구 학습에 대한 학생 인식 분석
이상현,안성훈 한국정보교육학회 2020 정보교육학회논문지 Vol.24 No.6
코로나 19로 인하여 대부분 학교에서 온라인 학습을 실시하고 있다. 본 연구에서는 초등학교 6학년 학생을 대 상으로 총 12차시의 블록형 교육용 프로그래밍 도구 수업을 온라인 학습 형태로 실시한 후 엔트리 학습에 대한 학생의 학습 경험에 대한 인식을 양적, 질적으로 분석하였다. 분석한 결과 학습자는 엔트리 프로그램 사용과 학 습 내용의 난이도에 대해 쉽게 인식하고 있는 것으로 나타났으며, 학습 만족도는 높게 나타났다. 학생들은 어려 움을 겪을 경우 사이트 자체에서 제공하는 힌트 기능에서 가장 많은 도움을 받은 것으로 나타났고, 엔트리를 학 습할 때 선생님의 필요성에 대해 낮게 인식한 것으로 나타났다. 질적 분석 결과 학습자는 쉽고 간편한 조작을 통해 신기함과 재미를 크게 느낀 것으로 나타났다. 한편, 학습 내용과 힌트 등이 이해되지 않아 어려움을 겪었으 며, 힌트 내용이 부족하다고 느낀 것으로 나타났다. 학생들은 자신이 원하는 대로 프로그램을 만들고 조작하면서 성취감을 느낀 것으로 나타났다. Due to COVID-19, most schools are conducting online learning. In this study, a total of 12 block-type educational programming tool classes were conducted in the form of online learning for 6th grade elementary school students, and then quantitatively and qualitatively analyzed students' perceptions of their learning experience on entry learning. As a result of the analysis, it was found that the learner easily recognized the use of the entry program and the difficulty of learning contents, and the learning satisfaction was high. When students face difficulties, it was found that they received the most help from the hint function provided by the site itself, and they were found to be less aware of the necessity of teachers when learning entry. As a result of the qualitative analysis, it was found that the learner felt a lot of novelty and fun through easy and simple operation. On the other hand, it was found that the learning contents and hints were not understood, which made them difficult and felt that the hint contents were insufficient. It was found that students felt a sense of accomplishment by creating and manipulating programs as they wish.