• Journal of Korean Society for Geospatial Information Science
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• v.21 no.2
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• pp.45-51
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• 2013

Today, people who live in sea of information are strongly appearing desire about quicker and more accurate information. For a long time people wanted to know information about place that I am and where I must go out, and there are various methods to have a keen desire for position information. Equipment that is using most among the method is digital camera. In this study, the accuracy of external orientation, GCP and check point depending on array of GCP and regional feature are analyzed after AT(aerial triangulation) with UltraCamX in three selected study area with specific feature. As analysis result, we could get to know that area with a mountainous district rapidly decreased accuracy of external orientation according as number of GCP decreases, and area with high buildings became low in vertical accuracy of checkpoint. This study has performed the analysis of regional factors in aerial triangulation accuracy.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.1
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• pp.145-153
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• 2018

SSL (Secure Socket Layer) and TLS (Transport Layer Security) are widely used protocols for secure and encrypted communication over a computer network. However, there have been reported several security vulnerabilities of SSL/TLS over the years. The vulnerabilities can let an adversary carry out critical attacks on SSL/TLS enabled servers. In this paper, we have developed a system which can periodically scan SSL/TLS vulnerabilities on internal network servers and quickly detects, reports and visualizes the vulnerabilities. We have evaluated the system on working servers of Naver services and analyzed detected vulnerabilities. 816 vulnerabilities are found on 213 internal server domains (4.2 vulnerabilities on average) and most vulnerable servers are not opened to public. However, 46 server domains have old vulnerabilites which were found 2016. We could patch and response to SSL/TLS vulnerabilites of servers by leveraging the proposed system.

• Journal of the Korean Society for Nondestructive Testing
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• v.33 no.4
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• pp.349-354
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• 2013

The non-destructive testing using infrared thermography is extended to a variety of industries and non-destructive testing of welds using infrared thermography is also in progress in various ways. Currently, a non-destructive testing of electrical resistance spot welds which is mainly used is Radiography Testing. This study detected area of spot welds nugget using optical-infrared thermography. In the results, it is possible for detecting defects of nugget in a short period of time using pulse-infrared thermography.

• 한국지형공간정보학회:학술대회논문집
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• 2004.10a
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• pp.33-37
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• 2004

고해상 입체 위성영상 엄밀 모델링(Rigorous Modeling)을 구현하고, 이를 기반으로 각 입체시 영상을 제작하여 3차원 정확도 평가를 수행하였다. 본 연구 지역으로 진주지역의 SPOTS 입체영상을 이용하였으며, 각 영상별 기준점 자료는 1/5000 수치지도를 이용하여 입체영상의 중복영역 내에 균등하게 지상기준점 40점을 추출하였다. 추출된 점을 각각 기준점과 검사점으로 구분하여 엄밀 모델링의 정확도를 분석하였다. 또한, 입체시 제작시에 기준점으로 사용된 지상좌표와 이에 대응하는 영상점을 이용하여 입체시 영상을 제작하였다. 제작된 입체시 영상에서 동일점을 획득하기 위해 영상 매칭 및 수치해석도화기(Helava System)를 이용하여 정확한 영상점을 획득하여 3차원 좌표를 계산하여 정확도 평가를 수행하였다.

• Journal of the Korean Institute of Gas
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• v.26 no.4
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• pp.18-26
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• 2022

The Korean government is conducting heat-using equipment(industrial boiler) inspection in accordance with the Energy Use Rationalization Act because of the heat-using equipment(industrial boiler)'s risks such as explosion and fire, and safe use and management. This paper aimed to setup the safe and performance vulnerabilities from database based on the inspection results for heat-using equipment(industrial boiler). This study surveyed the inspection results of 1,249 heat-using equipment(industrial boiler) which were failed inspection of heat-using equipment(industrial boiler) from january 2016 to december 2020. And the analysis method is to inform safety and performance vulnerability categories of heat-using equipment(industrial boiler) by statistically analyzing the failure reasons of boiler type and inspection type which are high variance in failure rate. The safety and performance vulnerability categories was abbreviated into 18 cases. And each catagory's main reason for failure was suggested by additional analyzing the opinions of inspectors. This paper would be the basic source and the comprehensive information dealing with the safety and performance vulnerability of heat-using equipment(industrial boiler).

• Korean Journal of Cognitive Science
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• v.13 no.4
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• pp.91-98
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• 2002

The aim of this study is to make the recall-based reading span test(Daneman & Carpenter, 1980) into the recognition-based test for on-line measuring the capacity of the participant. In order to measure the concurrent validity, a series of experiments is performed with varying features of distractors consisting of the reading span test. In experiment 1, which included irrelevant words as distractor, low correlation was observed. And in experiment 2, including several types of distractors which interfere with the selection of target words, low correlation was observed too. But in experiment 3, including distractors no more relevant in the Present trial but relevant in previous trial, high correlation was observed. The results of this study have theoretical implications on the validity of the reading span test and practical implication in that this study provides the tool for the studies on individual differences in working memory capacity.

• Journal of Welding and Joining
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• v.8 no.2
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• pp.1-12
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• 1990

본 고에서는 알루미늄 점용접시의 용접품질 및 용접봉 수명에 미치는 요소와 점용접부 설계방법에 대하여 간략히 설명하였다. 점 용접방법은 알루미늄 뿐만 아니라 steel의 박판용접에도 많이 사용되고 있으며, 특히 최근 공정자동화에 맞추어 가장 쉽게 자동화할 수 있는 용접 방법 중의 하나이다. 그러나 아직까지는 용접품질을 보증할 수 있는 비파괴 검사방법이 없기 때문에 새로운 비파괴 검사방법 개발 혹은 컴퓨터를 이용한 용접품질 추적방법에 대한 많은 연구가 요청된다. 한편 용접부 설계 관점에서는 조그만 단순 시편이 아닌 설계구조물을 이용한 용접강도 해석방법에 대한 연구가 미약하므로 이에 대한 많은 연구도 요청되고 있다.

• Proceedings of the KWS Conference
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• 2010.05a
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• pp.50-50
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• 2010

최근 토요타 자동차의 대량 리콜 사태로 안전과 관련된 자동차 품질에 대한 관심과 중요성이 크게 부각되었다. 본 연구에서는 나날이 높아지고 있는 자동차 품질 기준과 생산 비용 절감, 공정 자동화 요구에 부응하기 위한 차체 저항 점 용접부 품질 검사 자동화 기술 개발을 위해 적용 가능한 센서들을 비교, 검토하였다. 알려진 비파괴 검사 방법은 초음파, 와전류, 방사선 검사법 등 다양한 방법들이 존재하지만, 이 연구에서는 생산 라인 현장 적용이 가능한 소형 센서들을 중심으로 검토 영역을 제한하였다. 검토된 비파괴 검사 방법은 총 5가지 종류로 종래의 수동 초음파 검사법, 집적된 탐촉자를 이용한 3차원 초음파 검사법, NAUT(Non-contact Air-coupled Ultrasonic Test), EMAT(EletroMagnetic Acoustic Test), 그리고 너겟 프로파일러$^{TM}$이다. 이 연구에서는 각 검사법의 원리와 장단점을 설명하고 생산 라인 적용에 필요한 필수 항목들에 대해 고찰하였다.

• The Journal of the Korea Contents Association
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• v.21 no.7
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• pp.510-518
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• 2021

This study analyzed (1) the utility of telepractice in language assessment and (2) parental satisfaction for telepractice. Young children with language disabilities conducted REVT through both face-to-face and telepractice system. The correlation and paired t-test were analyzed. The results showed (1) the strong correlations between telepractice and face-to-face assessment scores. However, the telepractice score was significantly lower than face-to-face in the receptive vocabulary test and (2) the overall average of parental satisfaction for telepractice was 3.6 out of 5 points. The parents showed the highest satisfaction in terms of time and convenience of telepractice while the equivalence between telepractice and face-to-face item was the lowest. This study suggested the possibility and considerations in applying telepractice of language assessment in Korea.

• 건강소식
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• v.13 no.7 s.128
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• pp.2-7
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• 1989

건협 충북지부는 지역단위사업장 건강검사 사업을 실시해 각 사업장으로부터 좋은 반응을 얻고 있다. 근로자 건강검진이 관계법에 따라 다원화되어 있어 매년 3회 이상의 건강검사를 받아야 한다는 점에 착안, 1회로 필요한 모든 검사를 함으로써 근로자들의 불편함을 덜어주고, 그 만큼 낭비되는 시간이나 비용을 절약해 주는 결과를 가져온 이 사업은, 1차로 200여개소 사업장을 선정하여 검사를 실시했다. 앞으로 모든 사업장 건강검사를 맡아 국민건강 증진에 기여하겠다고 건협 충북지부의 굳은 의지를 보여주었다.