• International Journal of Computer Science & Network Security
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• 제23권3호
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• pp.161-168
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• 2023

It is a common practice to use a password in order to restrict access to information, or in a general sense, to assets. Right selection of the password is necessary for protecting the assets more effectively. Password finding/cracking try outs are performed for deciding which level of protection do used or prospective passwords offer, and password cracking algorithms are generated. These algorithms are becoming more intelligent and succeed in finding more number of passwords in less tries and in a shorter duration. In this study, the performances of possible password finding algorithms are measured, and a hybrid algorithm based on the performances of different password cracking algorithms is generated, and it is demonstrated that the performance of the hybrid algorithm is superior to the base algorithms.

• 정보관리학회지
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• 제13권1호
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• pp.173-185
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• 1996

본 논문에서는 부울검색시스템에서 사용자로부터 입력되는 부울 질의를 효율적으로 연산하기 위한 부울 질의 최적화 방법 4가지를 기술한다. 첫째, 프로그래밍 언어에서 논리식의 계산에 사용되는 단거리계산 방법을 적용한다. 둘째, AND, NOT과 같은 특정 연산자를 효율적으로 연산하기 위하여 색인어 출현 빈도의 차이를 이용한다. 세째, 분배법칙이 적용된 질의를 원래의 식으로 변환하여 연산의 수를 감소시킨다. 마지막으로 반복되는 식을 포함하는 질의에 대하여 중복 연산을 회피한다. 또한 위의 4가지 방법들을 UNIX환경에서 개발된 KRISTAL-II 시스템에 구현하여, 제시된 방법들이 특정 경우에 검색 속도를 향상시킬 수 있음을 검증하였다.

• 스마트미디어저널
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• 제9권1호
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• pp.51-59
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• 2020

인터넷의 발달과 스마트폰의 보급으로 인하여 그에 따른 소셜 미디어 문화가 형성됨에 따라 PC통신부터 지금까지 소셜 미디어 신조어가 그 문화로 자리 잡아가고 있다. 소셜 미디어의 등장과 사람들의 가교역할을 해주는 스마트폰의 보급화로 신조어가 생기고 빈번하게 사용되고 있는 추세이다. 신조어의 사용은 다양한 문자 제한 메신저의 문제점을 해결하고 짧은 문장을 사용하여 데이터를 줄이는 등 많은 장점을 가지고 있다. 그러나 신조어에는 사전적인 의미가 없으므로 데이터 마이닝 기술이나 빅데이터와 같은 연구에서 사용되는 알고리즘의 성능 저하와 연구에 제약사항이 발생한다. 따라서 본 논문에서는 웹 크롤링을 통해 텍스트 데이터를 추출하고, 텍스트 마이닝과 오피니언 마이닝을 통해 의미부여 및 단어들에 대한 감정적 분류를 통한 문장의 오피니언 파악을 진행하고자 한다. 실험은 다음과 같이 3단계로 진행하였다. 첫째, 소셜 미디어에서 새로운 단어를 수집하여 수집된 단어는 긍정적이고 부정적인 학습을 받게 하였다. 둘째, 표준 문서를 사용하여 감정적 가치를 도출하고 검증하기 위해 TF-IDF를 사용하여 데이터의 감정적 가치를 측정하기 위해 명사 빈도수를 측정한다. 신조어와 마찬가지로 분류된 감정적 가치가 적용되어 감정이 표준 언어 문서로 분류되는지 확인하였다. 마지막으로, 새로 합성된 단어와 표준 감정적 가치의 조합을 사용하여 장비 기술의 비교분석을 수행하였다.

• 비교문화연구
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• 제25권
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• pp.627-648
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• 2011

The study analyzed a diachronic distribution, social meanings and social evaluations of ROOJIN. 'Headline Database of Newspaper Articles' and 'Balanced Corpus of Contemporary Written Japanese' by KOKKEN were used as research data. There were 305 newspaper articles (About 0.2%) which contained the word ROOJIN at 'Headline Database of Newspaper Articles'. The number of newspaper articles related to ROOJIN started to increase in a rapid rate in 1972 and 1973. They were also increased in 1976, from 1981 to 1987, 1992 and 1993. The reasons of increasing of newspaper articles related to ROOJIN on those 4 periods of time could be summarized as follows. Firstly, there was a increasement of ROOJIN who are lonely, are not able to move about freely or live alone. Secondly, the understanding of a symptom of aging called BOKE was necessary. Thirdly, there were negative evaluations in a society towards ROOJIN. There were 453 cases which contained the word ROOJIN at 'Balanced Corpus of Contemporary Written Japanese' on the data since 2000. The most frequently used words were ones that are related to senior care facilities. There were 109 cases (24%) which contain those words. '~SISETSU', '~SENTA-', '~HO-MU' were presented as words related to senior care facilities. Among them, 78 cases contained the word '~HO-MU' which was similar to a home with family members. The second most frequently used words were ones that are related to 'welfare for the aged' and they are led by 'medical care for the aged'. They occupied about 8%. Institutionalization of medical care for the aged, medical expenses, nursing were presented as words related to 'medical care for the aged'. Words that were related to 'welfare for the aged' led by 'senior care facilities' and 'medical care for the aged' occupied about 32% of research data. As mentioned above, problems of the aged in Modern Japan such as negative evaluations in a society towards ROOJIN, ROOJIN who are lonely, are not able to move about freely or live alone, BOKE could be identified by analyzing the data. Also, The frequent usage of words such as 'Home for the aged', 'medical care for the aged' and 'nursing' could be identified. The outcome of analysis suggested that a family traditionally had a function of solving problems of the aged but that function was reduced in modern Japan. It also suggested that there was a tendency to outsource problems of the aged as much as possible.

• 한국수학교육학회지시리즈A:수학교육
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• 제26권1호
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• pp.11-19
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• 1987

The purpose of this research is to investigate the strategies for problem solving used by teachers and students and obtain some information which would be useful to enhance the ability of problem solving of the students. For this purpose we apply the thinking aloud method to study 6 graders and 6 teachers who were asked to solve 5 word problems. And we create a coding system to analyze those strategies. Using this coding system, we code the examinees and problems. we come up with the following facts from our study. (1) The number of strategies used by teachers is less than that used by students. (2) The characteristic of the strategies used by students is to set up an equation. (3) There is deep relationship between understanding the question and choosing the successful strategies for problem solving. (4) The students use the inductive argument more often than the teachers in the case of nonroutine mathematical problem. (5) The student of high success rate have fewer strategies than the others. From the above facts. it proposes the following conclusion for the enhancement of the ability of problem solving: So far the teachers usually use a few typical strategies for problem solving. But they need to create various strategies for pqoblem solving. It makes it possible for the students to choose proper strategies according to their ability. The students need to be given nicely constructed problem with enough time.

• 한국도서관정보학회지
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• 제15권
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• pp.207-243
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• 1988

This study is an attempt to furnish some helpful data for the maximum use of online information retrieval systems based on the comparative analysis of commands and operating terms employed by DIALOG, ORBIT and BRS which are three largest information retrieval systems in the world. To begin with, the historical development, service contents and retrieval functions of three systems were overviewed in the second chapter, on the basis of which the concrete functions and contents of the commands and the operating terms of the three systems were compared and analyzed one another. Commands were explained divided into basic and special ones. The basic commands subdivided into 44 items were put into the form of a diagram(Table 1). The special commands were first subdivided into search commnad, output-related commands and su n.0, pplementary commands, and then 14 items of which were comparatively analyzed and were represented as a chart(Table 2). In addition, any stand-alone commands employed by each system were also analyzed as a chart(Table 3). The Operating terms other than commands were subdivided into 16 items and were represented as a chart(Table 4). Password, inverted file, search step number in search session, etc were explained to the very detailed extent. A self-evident, single word is that the through understanding of commands is essential to the maximm use of all the functions of each of three systems.

• 복식
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• 제22권
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• pp.297-312
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• 1994

Today though the word ginyoe(gisaeng) was remained as a historic relic but they were firmly existed about 40 years ago and ginyoe's number was about three million in Chosun it's almost near 0.5% of the total population of Chosun. To think that point the ginyoe's so-ciety was considered a special one in the his-tory of Korean woman. The ginyoe as a special social class were specialize in technical art such as dancing and prostitute. Although they were low class they were luxurious slaves whoses clothing was almost equal to that of royal family. They were the leaders of fashion in woman clothing that's because their role was entertainer, This study can be summarized as follows. First ginyoe and public woman's clothing codes were nearly same in koryo but tatally separated in chosun. I could find that was came from those day's moral sprit. Second ginyoe's clothing was not only have luxuriance like royal family but also have unique clothing codes for them. Though they are low class ginyoe could use upper class's clothing codes. But upper class women could'nt use ginyoe's clothing codes are vary various and have their own clothing codes. Third I analyzed ginyoe's clothing codes and then derived 6 ginyoe's clothing messages. They were symbol of wealth symbol of power symbol of occupational function symbol of sexual attraction symbol of social position symbol of freedom.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권11호
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• pp.3913-3934
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• 2021

Real-time prediction of Web service of quality (QoS) provides more convenience for web services in cloud environment, but real-time QoS prediction faces severe challenges, especially under the cold-start situation. Existing literatures of real-time QoS predicting ignore that the QoS of a user/service is related to the QoS of other users/services. For example, users/services belonging to the same group of category will have similar QoS values. All of the methods ignore the group relationship because of the complexity of the model. Based on this, we propose a real-time Matrix Factorization based Clustering model (MFC), which uses category information as a new regularization term of the loss function. Specifically, in order to meet the real-time characteristic of the real-time prediction model, and to minimize the complexity of the model, we first map the QoS values of a large number of users/services to a lower-dimensional space by the PCA method, and then use the K-means algorithm calculates user/service category information, and use the average result to obtain a stable final clustering result. Extensive experiments on real-word datasets demonstrate that MFC outperforms other state-of-the-art prediction algorithms.

• 한국초전도ㆍ저온공학회논문지
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• 제11권3호
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• pp.46-49
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• 2009

A 3-phase 100m long, 22.9kV class HTS power transmission cable system was developed by Korea Electrotechnology Research Institute (KERI) and LS cable Ltd. those are participated in the 21st Century Frontier project R&D Program of Korea. It is important to test the DC critical current related with its power capacity before applying to the real power grid. In 1995, several international standards organizations including International Electrotechnical Commission (IEC), decided to unify the use of statistical terms related with 'accuracy' or 'precision' in their standards. It was decided to use the word 'uncertainty' for all quantitative (associated with a number) statistical expressions. In this paper, we measured DC critical current of 22.9kV/50MVA superconducting power cable with several voltage tap and analyzed the uncertainty with these results.

• 인지과학
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• 제19권4호
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• pp.459-476
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• 2008

많은 사용자들의 참여로 구축된 집단 지성을 이용한 지식 검색 서비스에서 사용자가 원하는 답변을 빨리 찾고자 하는 요구가 증가하고 있다. 기존의 연구에서 조회 수, 추천 수, 답변 수와 같은 비텍스트 정보가 답변을 평가하는데 좋은 자질임이 증명되었고, 신뢰도를 추정할 수 있는 여러 종류의 단어 사전을 이용하여 답변의 좋고 나쁨을 평가할 수 있는 연구도 진행되었다. 하지만, 조회 수, 추천 수, 답변 수와 같은 비텍스트 정보는 사용자 조작이 간단하여 지속적으로 관리를 해야 하며, 신뢰도를 추정할 수 있는 단어는 지속적으로 보강되어야 한다. 본 논문에서는 이러한 문제점을 해결하고자 동시출현 자질을 이용한 질문과 답변의 유사성을 활용하여 집단 지성에서 사용자의 활동을 분석하여 사용자의 명성을 평가하는 방법을 제안한다. 사용자의 명성을 계산할 수 있다면 조회 수와 추천 수가 많지 않은 답변의 신뢰도도 비교적 정확하게 추정할 수 있다. 이를 위해 우리는 PageRank 알고리즘을 수정하여 사용자 명성을 계산한다. 네이버 지식iN의 문서로 실험한 결과, 기존 정답 선택률을 보완할 수 있는 결과를 보였다.