• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.375-381
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• 2017

This study examined whether a correlation exists between the oral health indices assessed by experts and the self-perceived oral health status to develop practical oral health improvement programs for adults. In addition, this study provides basic data for carrying out oral health projects that can enhance the quality of life of adults. The raw data for the 2nd year (2014) of the 6th national health and nutrition survey were analyzed. Among those surveyed, adults over the age of 19 were designated as research subjects. In all age groups, correspondents with a higher DMFT Index assessed their self-perceived oral health status to be 'poor'. The oral health index evaluated by experts showed a correlation with the self-perceived oral health status. Therefore, as a higher self-perceived oral health status might help improve the objective oral health indices, oral health improvement programs should be strengthened to instill self-perceived oral health behavior.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.526-528
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• 2003

지문 영상의 품질은 지문 인식의 성능에 큰 영향을 미친다. 그러므로 지문 영상의 품질을 명가하고 정의하는 과정이 선행되면 안정된 지문 인식 성능을 보장 받을 수 있다. 본 연구의 목적은 지문 영상 품질을 측정하는 알고리즘을 이용하여 정합 후 인증성공률을 높이는 것이다. 본 연구는 지문 영상의 품질을 측정하는 세가지 알고리즘을 구현하고 정량적으로 표현한 후 품질 정도에 따라 분류한 영상들을 이용하여 본인 대 본인 정합을 수행하였다. 그리고 알고리즘간의 특성을 비교하였으며 품질에 따른 정합 성능을 평가하였다. 실험 결과, 품질 평가 후의 정합 성능이 그렇지 않았을 때의 성능에 비해 5% 이상의 성능 향상을 보였다. 또한 좀 더 나은 성능 향상을 위해서는 융선의 지속성과 일관성을 판단할 수 있는 알고리즘 및 여러 품질 측정값들의 효율적인 조합의 연구가 필요하다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.499-501
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• 2004

교육의 새로운 방향은 가상 학교나 WBI와 같은 교육적 활용분야로 확대되고 있으나, e-Learning 상에서 이뤄지는 평가의 응시자에 대한 신뢰 확보는 어려운 상황이다. 기존의 인증이란 사용자가 E와 Password를 타인에게 공개하지 않는 한 본인임을 인증하였다. 하지만 온라인상에서 시험 응시자는 본인의 ID와 Password를 타인에게 알려주어 대리시험이 가능하게 함은 물론 시험문제의 공유 또는 다수의 응시자가 한 곳에 모여 문제를 풀어 감으로서 평가에 대한 신뢰도에 의문을 갖지 않을 수 없게 되었다. 이에 인터넷으로 원격조정이 가능한 PC카메라와 얼굴인식 프로그램 그리고 원격제어프로그램을 이용하여 응시자를 인증함으로써 부정행위를 원천적으로 봉쇄하고, 감독자가 언제 어디서나 웹을 통하여 쉽게 감독할 수 있도록 LMS 기능의 보완이 요구된다. 본 논문을 통해서는 채팅기능을 통한 상호 대화가 가능하고 응시 장면을 동영상으로 압축 저장하여 사후 감독이 가능토록 함으로서 e-Learning상에서의 평가 및 학사관리의 공정성 및 신뢰도를 높일 수 있는 방안을 제시하였다.

• Computational Structural Engineering
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• v.12 no.1
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• pp.115-117
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• 1999

최근 구조물의 유지관리에 있어서 사용기간이 경과하고 노후회됨에 따라 구조물을 효율적으로 유지관리하여 보다 장기간 안전하게 구조물을 사용하기 위하여 구조물 수명연장을 위한 연구 및 구조물 상태를 정량적으로 평가하는 기술이 연구된다. 본인은 이에 대한 연구를 위해 1998년 9월 한국건설기술연구원에서 NIST에 객원 연구원으로 파견되어 근무하고 있다. 이 글에서는 본인이 근무하고 있는 NIST에 대해 회원들에게 간략히 소개하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06c
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• pp.195-197
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• 2012

현재 우리나라 대학생의 수는 전문 대학생 수를 포함하여 약 300만명이다. 그만큼 우리나라는 대학교 진학률이 높고 대학생 수가 많다. 하지만 많은 학생들은 수강신청을 할 때 강의에 대한 충분한 사전 지식없이 수강신청을 하여 본인이 생각했던 강의와 다른 강의를 수강 하는 학생들이 적지 않다. 이에 본 논문은 수강을 한 학생들의 수강평가를 대상으로 텍스트마이닝과 오피니언 마이닝을 적용하여, 키워드를 추출하고, 그것의 분석을 통해 본인에게 맞는 강의를 파악할 수 있는 시스템을 제안하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.3
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• pp.1246-1254
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• 2012

The South Korea has the highest overall smoking rates of male among the thirty member-countries in the Organization for Economic Cooperation and Development. This study was performed to determine the association between amount of smoking and self-reported voice problem in Korean adult population using national survey data. Data were drawn from the Korea National Health and Nutritional Examination Survey 2008. Subjects were 3,600 persons (1,501 male, 2,099 female) aged 19 years and older living in the community. Adjusting for covariates (age, sex, education, income, longest occupation, alcohol drinking, pain and discomfort during the last 2 weeks), Severe smoke (>40.5-55.5 pack year), more than 20 cigarettes per day were independent risk factors for self-reported voice problem. It was found that the number of cigarettes smoked per day (CPD) the proportional increased in risk of voice disorders. These findings suggest that the investigation of CPD are required for effective screening of voice disorder.

• Journal of Preventive Medicine and Public Health
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• v.31 no.1 s.60
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• pp.49-58
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• 1998

The study was done to determine the reliability and validity of a life style questionnaire for the elderly. The questionnaires were sent to 16,524 elderly people who were beneficiaries of Korean Medical Insurance Corporation in Pusan. Among the completed 9,139 questionnaires, 200 were randomly sampled and retested. finally, 110 duplicates were collected. Weighted kappa-value and Pearson correlation coefficients were estimated to measure the reliability. Validity coefficient was estimated by using reliability coefficient. In self-self responses, reliability coefficients of the most of items were over 0.6 except some physical activity related item. Relatively high reliability was observed in smoking, alcohol related items and anthropometric items. In self-proxy responses, most of the physical activity related items were found to be less reliable than self-self responses. Smoking and alcohol related items were consistently reliable. Male showed higher validity in food related item than female. On the other hand, some of the physical activity related items and smoking and alcohol related items were less valid in male than female. With regard to bias of proxy respondents, offsprings tended to underestimate the frequency of house cleaning' and 'kitchen work' and overestimate the height of them. In conclusion, the life style questionnaire was found to be reliable in the most of items. But, some items related with physical activity were found to be somewhat less reliable. Sexual difference on the validity was identified in some items. With regard to bias of proxy respondents, offsprings tended to have bias in part of items of housework and anthropometry.

• Weed & Turfgrass Science
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• v.4 no.1
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• pp.35-43
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• 2015

To assess the dormancy associated weedy risk of the F1 hybrid generated by hybridization between Brassica juncea (maternal) and Brassica napus (paternal), seed germination, dormancy and longevity were examined sequentially after seed harvest. The F1 hybrids exhibited the intermediate characteristics of their parents in seed germination and dormancy with relatively high dormancy rate of 41.1%. In summer, F1 hybrid seeds buried in the 3 cm soil exhibited greater viability (52.4%) than those in the soil surface with greater seed longevity (74.6%) than its maternal (63.3%) and paternal (33.7%) parents at 100 days of over-summering in soil. In winter, F1 seeds buried in the soil surface were more viable than those in the 3 cm soil with greater seed longevity (83.5%) than its maternal (39.0%) and paternal (71.7%) parents at 100 days of over-wintering in soil. Therefore, it is concluded that F1 hybrid resulted from gene flow from OSR to mustard has high seed dormancy and longevity during summer and winter, suggesting its weedy risk potential. Further studies are required to examine the reproductivity and fitness cost of F1 hybrid to make a clearer conclusion of its weedy risk.

• Journal of the Korea Society of Computer and Information
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• v.17 no.7
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• pp.117-128
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• 2012

Recently IT infrastructure plays a central role in the base of the society. However, use of personal registration number on internet sites has become a major factor increasing danger of leaking of personal information. Currently, the government is recommending various information protection services in order to prevent the collection of personal registration numbers and leaking of personal information on the internet. Among them, i-PIN service is the one recommended for minimal use of personal registration numbers on the internet. Although i-PIN can be used as a way to substitute personal registration numbers on the internet, there are certain limitations in using i-PIN as the only key to recognize individuals. This study proposes organization of web system in which self certification can be conducted using i-PIN as a tool for personal certification. Also its usability and stability have been verified through performance test when i-PIN service is linked with web service and used as personal certificate. But i-PIN service is unavailable if obstacles occur in providers of i-PIN self certification. To settle this inconvenience, the study also proposes how to cope with such obstacles.

• Journal of The Korean Association of Information Education
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• v.16 no.3
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• pp.283-289
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• 2012

A distance learning is diffusing rapidly in society. It is more difficult to confirm a learner's identity and learning processing in a distance learning. Distance learning has a checking attendance system because a teacher and student do not meet face to face. There are some checking attendance systems such as login check, SMS authenticating system, unexpected quiz, and so on. However, existing checking attendance system has some problems to check learner's attendance in a whole lesson. Therefore, this study designed and developed learner's attendance system based on PC camera's shot of certification in a whole lesson. This attendance checking system can judge real attendance of learners in a distance learning and distance evaluation. The system is expected to make trust of a distance learning higher.