• Journal of the Korean Society for Library and Information Science
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• v.38 no.1
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• pp.143-172
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• 2004

The purpose of this article is to evaluate the quality of digital libraries which Korean society has built with. To the end, first discussed is the operational definition of digital library, which has a variety of meanings and definitions. For the quality evaluation, 10 criteria were developed on the basis of both literature review and user survey. Followed was a thorough investigation to identify the present status of digital library construction. Then, we selected the most representative digital libraries in Korea, and conducted the quality verification on the basis of previously developed 10 criteria. The conclusion includes both major causes of low quality and some strategies for improving the low quality of digital libraries at the national level.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.155-158
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• 2012

$CO_2$ 소화설비는 방호구역 내 적절한 설계농도를 확보하고 또한 일정 시간 유지해 주어야 충분한 소화성능을 발휘할 수가 있다. 따라서 시공 후에도 $CO_2$ 소화설비의 성능을 주기적으로 확인이 필요하다. 석유화학플랜트나 원자력발전소와 같은 국가 중요위험시설은 화재 발생시 대형피해가 발생할 수 있으므로 직접방사시험을 통해 소화성능을 검증할 필요가 있다. 본 연구는 국가 중요위험시설에 설치된 전역방출방식의 $CO_2$ 소화설비 중에서 표면화재 방호구역과 심부화재 방호구역을 각각 선정하여 $CO_2$ 소화설비의 소화성능을 검증해 보았다. 시험결과 표면화재와 심부화재 방호구역 모두 $CO_2$ 설계농도를 확보하고 있음을 확인하였으며, 심부화재의 경우 20분 이상 설계농도가 유지되었다. 본 연구를 통해 직접 방사시험 방법 및 판정방법을 소개하였으며, 국가 중요위험시설에는 직접 방사시험을 통한 소화설비 신뢰성 검증의 필요성을 제기하였다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.4
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• pp.387-394
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• 2000

The biggest factor of errors which is constructed to the database of aerial photo image is happen to process of scanning with aerial photogrammetric scanner. For the quality assurance of aerial phto image database, we are need to the verification process of aerial photogrammetric scanner. This study is purposed to exhibit quality assurance method of aerial photo image database which is established to verification method of accuracy for aerial photogrammetric scanner. As the results of this study, we are established to verification method of accuracy for aerial photogrammetric scanner. And, the proposed methods according to this study are known to contributequality assurance of aerial photo image database.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.537-537
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• 2012

천수방정식의 수치모형은 하천의 유량예측, 홍수범람해석, 해일 모의 등에 널리 사용되고 있고, 그 결과는 수자원 관리, 재난 대책 등 정책적인 의사결정에 있어 유용한 자료로 활용되고 있다. 이처럼 천수방정식의 수치모형은 연구목적뿐만 아니라 실생활에 있어서도 큰 영향을 미치고 있으며, 이에 보다 정확하고 효율적인 수치모형의 구축이 수리/수자원/방재분야에서 중요한 영역이 되고 있다. 본 연구는 정확하고 안정적인 수치모의를 위해 천수방정식의 수치모형에 MLP(Multi dimensional Limiting Process)기법을 적용한 후 다차원 모의 시 MLP의 수치 진동 제어 성능을 검증하고자 하였다. MLP기법은 다차원에서 수치진동을 억제할 수 있도록 개발된 기법으로, 기존 TVD 제어자(limiter)과 MLP의 차이점은 기존 제어자들이 흐름이 발생하는 셀 경계면에서 재구성된 값이 Maximum Principle을 만족시키도록 제어자를 유도하는데 반해, MLP는 셀 절점에서 Maximum Principle을 만족시키도록 제어자를 유도한다는데 있다. MLP기법은 압축성 유체를 표현하는 2, 3차원 오일러 방정식에 적용되어 기존의 제어자들에 비해 안정적이며 정확한 수치모의를 가능하게 하는 것이 검증되었다. 하지만 천수방정식에 적용된 예는 없으며, 이에 본 연구는 천수방정식에 MLP를 적용하고 천수방정식 수치모형 검증에 주로 사용되는 수치모의를 통해 MLP의 수치 진동 제어 성능을 검증하였다. 모의 결과, MLP는 2차원 천수방정식에 있어서도 기존의 제어자들과 비교하여 수치진동을 보다 잘 제어하는 것으로 판단된다. MLP의 사용으로 인해 불연속면 근처에서 정확도가 향상되었고 수치진동이 발생하지 않아 보다 안정적인 모의가 가능하였다.

• Korean Journal of Remote Sensing
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• v.37 no.3
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• pp.649-655
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• 2021

This study purposes to cross-validate its performance by applying the optimal seismic vulnerability assessment model based on previous studies conducted in Gyeongju to other regions. The test area was Pohang City, the occurrence site for the 2017 Pohang Earthquake, and the dataset was built the same influencing factors and earthquake-damaged buildings as in the previous studies. The validation dataset was built via random sampling, and the prediction accuracy was derived by applying it to a model based on a random forest (RF) of Gyeongju. The accuracy of the model success and prediction in Gyeongju was 100% and 94.9%, respectively, and as a result of confirming the prediction accuracy by applying the Pohang validation dataset, it appeared as 70.4%.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.1
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• pp.99-113
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• 2003

As a research on PKI(Public Key Infrastructure) is being very popular, the study relating to certificate status and path validation is being grown with aim to reduce an overhead of the protocol and to provide an efficient operation. But in spite of a lot of related research there is still almost no protocol that we can use for real-time based client-server environment with large scale like internet banking. In this paper, we shows that the existing standards or protocols are not suitable to be used for such a real-time based client-server environment with large scale, and then proposes an efficient certificate status and path validation system.

• Korean Journal of Social Welfare Studies
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• v.40 no.2
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• pp.123-143
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• 2009

To investigate the reliability, validity of posttraumatic growth among Korean cancer caregiver, 295 participants were asked to complete a Korean posttraumatic growth inventory, translated from the Posttraumatic Growth Inventory (PTGI; J Trauma Stress 1996; 9: 455.471), together with the Caregiver burden scale, life style interruption scale, economic burden scale and positive adaptation scale, social support scale and questions about religious and demographic factors. Cronbach's alpha was 0.95 for the K-PTGI, indicating sufficient internal consistencies. Construct and Criterion validity were also supported. K-PTGI appeared to be a sound measure for the experience of posttraumatic growth in cancer caregivers and this study result will be able to contribute to facilitate future research.

• Journal of the Society of Disaster Information
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• v.13 no.1
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• pp.89-95
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• 2017

The cases of animals unusual behavior have been reported occasionally before a major disaster occurs. Could animals unusual behavior associated with a major disaster occurrence, if so, could we foreknow a disaster occurrence? The purpose of study is to quest an answer through literature reviews on the relation between animals unusual behavior and premonitory symptoms of an earthquake. These empirical studies are classified three parts according as methodological framework; statistical analysis, experimental analysis, observation analysis. The results are simply divided as two, 'animals unusual behavior may be seen as a precursor of pre-disaster phenomena' and 'difficult to see.' A number of studies have been performed abroad, however there is no one in Korea. Most of the studies point out common limitations-difficult to verify the reliability of data, accidentally get and fewer samples of data, difficulty of ensuring appropriate data, etc. That is why more related research with animals unusual behavior and disaster occurrence is needed to validate cause-and-effect relation of animal unusual behavior and pre-disaster phenomena.

• Education of Primary School Mathematics
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• v.21 no.4
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• pp.431-444
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• 2018

The purpose of this study was to develop and validate a mathematics anxiety scale for elementary students in South Korea. Based on the literature review, I developed two types of survey items measuring elementary students' mathematics anxiety. Teachers or students may use survey measurements selectively according to the students' participants in mathematics private institutions. In order to assess the reliability and validity of survey items, I conducted surveys with elementary students. The sample consisted of 300 elementary students in public elementary schools in Seoul. A total of 28 items were developed and examined for the internal consistence. The results showed that the proposed scale was appropriate to represent the mathematics anxiety of elementary students. The survey items of this study could be applied for assessing elementary students' mathematics anxiety regardless of their gender and age factors.

• KIPS Transactions on Software and Data Engineering
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• v.4 no.6
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• pp.247-252
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• 2015

As software has gotten bigger in magnitude and the complexity of software has been increased, the maintenance has gained in-creasing attention for its significant impact on the cost. Identifiers have an impact on more than 90 percent of the readability which accounts for a majority portion of the maintenance activities. For this reason, the existing works focus on domain-specific features based on identifiers. However, their approaches have a limitation when either a class name does not reflect the intention of its context or a class naming is incorrect. Therefore, this paper suggests a series of class name validation process by extracting properties of classes, building learning model by applying a decision tree technique of machine learning, and generating a validation report containing the list of recommendable postfixes of classes to be validated. To evaluate this, four open source projects are selected and indicators such as precision, recall, and ROC curve present the value of this work when it comes to five specific postfixes including functional information on class names.