• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.12 no.2
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• pp.173-180
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• 1994

One can see more and more photograrmmetric applications dealing with the extraction of information from images obtained with CCD (Charge Coupled Device) camera scanners. In order for this information to be useful, the scanning errors of scanners must be known through a calibration. Investigation of this study is given to the detailed procedure of the correction for scanning errors created during the scanning of photographs with CCD camera scanner using the three kinds of high resolution reseal plates prepared. The geometric corrected digital images for scanning errors were generated and the accuracy of the resulting new images for each types of plates were checked comparing its image coordinates with there corresponding ground coordinates for the check points.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.4
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• pp.468-478
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• 2002

In this paper, we designed a B-WLL MAC(Media Access Control) protocol and validated its operation for implementation of high-speed subscriber networks. Our MAC protocol was designed by SDL using the DAVIC specifications based upon the variable contention/reserved time slot allocation algorithm. For validation of our MAC protocol, Syntax and semantic error check were performed by the Simulation Builder of ObjectGeode and the MAC(Message Sequence Chart) respectively. The validation results showed that our B-WLL MAC protocol is working correctly and may successfully support B-WLL services.

• Journal of the korean academy of Pediatric Dentistry
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• v.49 no.1
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• pp.65-75
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• 2022

The aim of this study was to evaluate QLF (quantitative light-induced fluorescence) technology for the caries detection in primary teeth and validate the relationships between the cavity volume of carious lesions and QLF analysis results. Total 125 tooth surfaces include 53 occlusal surfaces, and 72 proximal surfaces were investigated with the portable QLF device for detection of dental caries in primary molars. Micro-CT radiograph was also performed to classify carious lesions and calculate the cavity volume. QLF showed good accuracy and reliability (sensitivity 0.75 - 0.94, specificity 0.82 - 0.95, and AUROC 0.88 - 0.98) for the caries detection in primary teeth except 𝚫R average results of proximal caries which showed relatively low values. Statistically significant relationships were found between 𝚫F average, QS-Index and the cavity volume according to Spearman rank-order correlation coefficients (r = 0.805 - 0.832, p < 0.001). QLF detection method would be a harmless and reliable way for children to diagnose dental caries without the concern about radiation exposure.

• Journal of Intelligence and Information Systems
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• v.17 no.3
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• pp.79-98
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• 2011

This paper proposes a semantic recommendation technique for a personalized e-commerce portal. Semantic recommendation is achieved by utilizing the attributes of products. The semantic similarity of the products is merged with the rating information of the products to provide an accurate recommendation. The recommendation technique also analyzes various attitudes of the customer to evaluate the implicit rating of products. Attitudes are classifies into three types such as "purchasing product", "adding product to shopping cart", and "viewing the product information." We implicitly track customer attitude to estimate the rating of products for recommending products. Also we implement a session validation process to identify the valid sessions that are highly important for giving an accurate recommendation. Our recommendation technique shows a high degree of accuracy as we use age groupings of customers with similar preferences. The experimental section shows that our proposed recommendation method outperforms well known collaborative filtering methods not only for the existing customer, but also for the new user with no previous purchase record.

• Journal of Korea Society of Industrial Information Systems
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• v.6 no.1
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• pp.61-69
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• 2001

This study concerns designing effective fuzzy inference rules, which can be used to evaluate other experiment sets for sensory tests. The number of fuzzy inference rules might be determined by the fuzzy division of variables. For the more the number of fuzzy division does not mean the more effectiveness, the number of inference rules should be reduced to improve efficiency of inference engine of expert system. This study verified that its suggested method and inference rules are effective in comparison with the existing studies.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.589-592
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• 2009

u-헬스케어 서비스는 언제, 어디서, 어떠한 상황에서도 사용자에게 적절한 서비스를 제공할 수 있어야 한다. 그러한 u-헬스케어 서비스를 제공하기 위해서는 센서로부터 수집되는 데이터들에서 사용자의 상황에 적절한 정보인지, 그리고 데이터들의 유효성과 중복성을 검사해야 한다. 또한 이렇게 수집된 정보들을 u-헬스케어 서비스를 제공하는 시스템에서 적절하고 효과적인 관리 및 분석이 되어야만 사용자에게 적절한 헬스케어 서비스를 제공할 수 있게 된다. 따라서 본 논문에서는 사용자에게 적절한 의료서비스를 제공하는 u-헬스케어 시스템을 위하여 각종 상황정보를 검사하여 데이터를 추출하고, 이러한 데이터를 정형화하기 위한 모델링 기법을 제안한다.

• Journal of Radiation Protection and Research
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• v.38 no.4
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• pp.214-227
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• 2013

Computed tomographic scan as a screening procedures in asymptomatic individuals has seen a steady increase with the introduction of multiple-raw detector CT scanners. This report provides a brief review of the current controversy surrounding CT cancer screening, with a focus on the radiation induced cancer risks and clinical efficacy. 1. A large study of patients at high risk of lung cancer(the National Lung Screening Trial[NLST]) showed that CT screening reduced cancer deaths by 20%(1.33% in those screened compared with 1.67% in those not screened). The rate of positive screening tests was 24.2% and 96.4% of the positive screening results in the low-dose CT group were false-positive. Radiation induced lung cancer risk was estimated the most important in screening population because ERR of radiation induced lung cancer does not show the decrease with increasing age and synergistic connection between smoking and radiation risk. Therefore, the radiation risk may be on the same order of magnitude as the benefit observed in the NLST. Optimal screening strategy remain uncertain, CT lung cancer screening is not yet ready for implementation. 2. Computed tomographic colonography is as good as colonoscopy for detecting colon cancer and is almost as good as colonoscopy for detecting advanced adenomas, but significantly less sensitive and specific for smaller lesions and disadvantageous for subsequent therapeutic optical colonoscopy if polyps are detected. The average effective dose from CT colonography was estimated 8-10 $mS{\nu}$, which could be a significant dose if administered routinely within the population over many years. CT colonography should a) achieve at least 90% sensitivity and specificity in the size category from 6 and 10 mm, b) offer non-cathartic bowl preparation and c) be optimized and standardized CT parameters if it is to be used for mass screening. 3. There is little evidence that demonstrates, for whole-body scanning, the benefit outweighs the detriment. This test found large portion of patient(86~90.8%) had at least one abnormal finding, whereas only 2% were estimated to have clinically significant disease. Annual scans from ages 45 to 75 years would accrue an estimated lifetime cancer mortality risk of 1.9%. There is no group within the medical community that recommends whole-body CT. No good studies indicate the accuracy of screening CT, at this time. The benefit/risk balance for any of the commonly suggested CT screening techniques has yet to be established. These areas need further research. Therefore wild screening should be avoided.

• The Journal of the Convergence on Culture Technology
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• v.5 no.4
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• pp.355-359
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• 2019

Schirmer test is one of the most used methods for the diagnosis of dry eye. We attempted to develop a tear level measurement tool to replace unreliable Schirmer test with inaccurate results. Absorbency tests for various absorbents were carried out. As a result, ${\alpha}$ cellulose pulp was selected as the absorbent. Prototypes were produced and evaluated twice. Finally a tear level measurement tool in the form of a strip of ${\alpha}$ cellulose pulp adhered to a polyurethane was prepared. Usability evaluation of prepared tear level measurement tool was performed. As a result, it was confirmed that it has a significant correlation with SM tube developed oversea recently. In addition, it was judged to be useful as an alternative to the Schirmer test in terms of measurement time and accuracy.

• Journal of Korean Library and Information Science Society
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• v.49 no.2
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• pp.79-104
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• 2018

This study was to present a model of cooperative reading practice and verify reading effectiveness on youth. For this purpose, 68 reading clubs were established in 61 districts and 8 high schools. The research groups were classified as the poor reading group, the good reading group, and the mixed-skill reading group. The cooperative reading groups were carried out for four months. We developed a questionnaire on Reading effectiveness conducted it pre- and post-test, and analyzed the results through the SPSS statistical program. We found that there was a positive change in the reading effectiveness of youth and overall-the highest effectiveness was found in the poor reading group. In addition, there was a positive change in the reading behavior of youth. The change of reading effectiveness was found to affect reading behavior.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.1739-1743
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• 2009

현재 국내에는 하천시설물의 인증과 관련한 제도와 법령이 마련되어 있지 않다. 하천시설물과 관련된 인증 제도는 효율적인 하천시설물의 유지관리를 가능하게 하고, 치수 안전성 증대에 기여할 수 있다. 본 연구는 미국의 제방 인증(levee accreditation) 제도를 분석하여 국내에 적용하는 방안에 관한 것이다. 미국의 연방 재난 관리국(Federal Emergency Management Agency; FEMA)은 국가 홍수 보험 프로그램(National Flood Insurance Program; NFIP)을 관리하고 있는데, 그의 일환으로 제방 인증 제도를 시행하고 있다. 제방의 인증은 제내지를 보호하는 제방 시스템이 100년 빈도의 홍수에 대한 방어 능력이 있는지를 기술적으로 검토하는 것이다. 여기서 제방 시스템이란, 제방, 홍수벽, 수문 장치, 펌프시설, 암거, 내수 배제 시설 등 홍수로부터 제내지를 보호하기 위한 모든 시설을 포함한다. 미국은 제방 인증을 위한 제도로서 연방 규정 조례(code of federal regulation; CFR)를 두어 제방 시스템의 설계, 운영, 유지관리의 기준을 마련하였다. 제방 인증을 신청하는 기관은 연방 규정 조례에서 정의된 제방 시스템의 운영 및 유지관리에 관한 문서를 갖추어야하고, 공학적인 설계 기준에 대하여 면밀히 검토되어야 한다. 운영 및 유지관리에 관한 사항은 수문과 내수배제 시스템을 포함한 제방 시스템의 홍수 시 운영 지침과 운영실적, 유지보수 지침과 점검 보고서 등이다. 공학적인 설계 기준에 대한 검토사항은 제방의 여유고, 수문, 호안, 제방과 기초의 안정성, 침하, 내수배제에 관한 분석 결과이다. 이러한 제방의 인증에 필요한 기술적인 검토 자료와 관련 문서는 등록된 전문 기술자나 제방의 설계와 시공능력을 갖춘 연방 기관을 통해 보증(certification) 되어야 한다. 현재, 미국에서 제방의 보증을 결정하는 대표적인 기관은 미 공병단(U.S. Army Corps of Engineers; USACE)이다. 제방 보증의 유효기간은 최대 10년이지만 검사와 평가가 지속되고, 유효 기간 만료 전이라도 언제든지 재검토될 수도 있다. 또한, 제방 시스템 전체에 대하여 보증 여부를 결정하고, 개별 시설에 대한 보증이나 조건부 보증은 수행하지 않는다. 국내에 제방 인증 제도를 도입하기 위해서는 제방 인증에 관한 절차, 수행 기관, 수행 방법 등에 대한 규정과 제도가 마련되어야 하고, 현재 국내에서 수행되고 있는 하천시설물의 안전도 검사 방법을 포함한 평가 지표와 평가 기술에 대한 인증 표준화가 요구된다.