• Convergence Security Journal
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• v.19 no.2
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• pp.3-9
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• 2019

Most of security countermeasures have been implemented to cope with continuous increase leakage of technology, but almost security countermeasures are focused on securing the boundary between inside and outside. This is effective for detecting and responding to attacks from the outside, but it is vulnerable to internal security incidents. In order to prevent internal leakage effectively, this study identifies activities corresponding to technology leakage activities and designes technology leakage activity detection items. As a design method, we analyzed the existing technology leakage detection methods based on the previous research and analyzed the technology leakage cases from the viewpoint of technology leakage activities. Through the statistical analysis, the items of detection of the technology leakage outcomes were verified to be appropriate, valid and reliable. Based on the results of this study, it is expected that it will be a basis for designing the technology leaking scenarios based on future research and leaking experiences.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.531-532
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• 2015

마이크로그리드 내에서 기존의 중앙 제어 방식은 중앙 제어기가 방대한 데이터의 수집 및 처리를 포함해 제어 결정까지 대부분을 부담하여 확장성과 유연성이 좋지 않다. 따라서 이를 위한 해결책으로 부담을 나눌 수 있는 분산 제어가 필요하다. 본 논문에서는 Multi Agent System(MAS)를 기반으로 일치 알고리즘을 이용한 정보 공유를 통해 유닛들의 분산 제어를 제시하였고 캠퍼스 마이크로그리드에 대한 적용가능성을 분석했다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.439-441
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• 2000

통신 기술의 발달은 컴퓨터를 활용한 정보 교환을 수월하게 만들었지만, 더불어 정보 유출의 가능성 또한 증가하였다. 특히 전자상거래와 같이 정보의 보호가 필요한 응용들도 급격히 활성화됨을 따라, 정보의 보안은 반드시 필요하며, 보안 서비스 중에서도 공정한 부인 봉쇄 서비스는 필수적이다. 기존에 제안된 부인 봉쇄 기법들은 보통 공정성을 위해 송.수신자는 중개자인 Trusted Third Party(TIP)를 두어 서로 통신한다. 하지만, 클라이언트수가 증가하면 중앙의 TTP에 네트웍 트래픽이 집중되어 효율적이지 못한다. 본 논문에서는 중앙 TTP에 집중되는 네트웍 트래픽량을 줄이기 위해 TTP를 분석시키는 새로운 부인봉쇄 프로토콜을 제시한다.

• Journal of the Korean Society of Radiology
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• v.85 no.2
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• pp.394-408
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• 2024

Purpose To develop models to predict programmed death ligand 1 (PD-L1) expression in pulmonary squamous cell carcinoma (SCC) using CT. Materials and Methods A total of 97 patients diagnosed with SCC who underwent PD-L1 expression assay were included in this study. We performed a CT analysis of the tumors using pretreatment CT images. Multiple logistic regression models were constructed to predict PD-L1 positivity in the total patient group and in the 40 advanced-stage (≥ stage IIIB) patients. The area under the receiver operating characteristic curve (AUC) was calculated for each model. Results For the total patient group, the AUC of the 'total significant features model' (tumor stage, tumor size, pleural nodularity, and lung metastasis) was 0.652, and that of the 'selected feature model' (pleural nodularity) was 0.556. For advanced-stage patients, the AUC of the 'selected feature model' (tumor size, pleural nodularity, pulmonary oligometastases, and absence of interstitial lung disease) was 0.897. Among these factors, pleural nodularity and pulmonary oligometastases had the highest odds ratios (8.78 and 16.35, respectively). Conclusion Our model could predict PD-L1 expression in patients with lung SCC, and pleural nodularity and pulmonary oligometastases were notable predictive CT features of PD-L1.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.154-154
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• 2022

2019년 9월 8일 자동차운반선 골든레이호가 미국 브런즈윅항(Brunswick)항에서 출항 도중 전도되는 사고를 입었다. 도선사와 선원 23명은 모두 구조되었으나, 사고선박은 복구 불가로 전손(해체)처리 되었다. 미연방교통안전위원회(NTSB)는 담당사관이 선박 복원성 계산 프로그램에 평형수 양을 잘못 입력하였고, 충분한 GM 부족으로 선회 중 발생한 경사모멘트에 대응하지 못해 전도된 것으로 추정하였다. 우리나라 중앙해양안전심판원의 특별조사부에서도 미국과 동일한 원인에 의해 전도된 것으로 판단하였다. 본 연구에서는 골든레이호와 유사한 선박을 대상으로 상황별 GM를 계산하였고, 상황별/속력별 최대 횡경사각을 계산하였다. 선속 10노트 이하에서는 GM값이 작은 상황에서도 전도 위험은 높지 않았다. 다만, 13노트 이상이 되면 20도 이상의 횡경사각이 발생하여 전도 위험이 높아짐을 알 수 있었다. 이번 골든레이호 전도사고와 같은 사고를 방지하기 위해서는 담당사관이 복원성 계산능력을 충분히 갖출 수 있도록 복원성에 대한 교육 및 훈련을 강화할 필요가 있으며, 복원성 계산과정에서 발생할 수 있는 오류를 확인하기 위한 검증 절차를 선박과 회사에서 마련할 필요가 있다.

• Analyses & Alternatives
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• v.7 no.3
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• pp.61-84
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• 2023

In this paper, I tried to clarify the background of the strengthening of centralization in the central-local relations during the Xi Jinping period in terms of the institutional structure of elite politics through a comparative study of the composition of the provincial sector of the Politburo, the highest power body, during the time of Hu Jintao and Xi Jinping. Compared to the Hu Jintao period, it is judged that the strengthening of centralization in the Xi Jinping era is being implemented not through the neutralization of institutionalized formal construction norms, but through the expansion of control within the norms. In other words, the institutionalized frame itself was not broken in the composition of the provincial sector of the Politburo, and local compliance with the central government centered on the general secretary was increased by exercising the right to control personnel more strongly.

• Pediatric Infection and Vaccine
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• v.29 no.2
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• pp.84-95
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• 2022

Purpose: Urinary tract infections (UTIs) are the most common serious bacterial infections in young infants. Lumbar puncture (LP) has been used to diagnose coexisting meningitis in infants under 90 days of age with suspected UTI in many hospitals. However, the incidence of bacterial meningitis associated with UTIs is low. We aimed to describe the prevalence of concomitant bacterial meningitis in young infants with UTIs. Methods: The medical records of infants with the first episode of UTI admitted to the Chung-Ang University Hospital from January 2010 to December 2019 were retrospectively reviewed. Infants aged < 90 days who underwent LP with initial evaluation were included. Demographic and clinical features, laboratory findings, and imaging findings were collected and analyzed. Results: Eighty-six infants with UTIs were enrolled in the study. The median age was 61.5 days (interquartile range, 42.3-73.8 days) and boys (90.7%) were predominant. Escherichia coli was the most common pathogen (n=80, 93.0%) and followed by Klebsiella species (n=5, 5.8%). Fifteen (18.1%) specimens produced extended spectrum β-lactamase (ESBL). Five (5.8%) infants had positive blood culture results. Seven (8.1%) infants showed pleocytosis in the cerebrospinal fluid, but none had coexisting bacterial meningitis. Twenty-four (30.8%) infants showed renal dilatation or hydronephrosis on ultrasonography. Dimercaptosuccinic acid (DMSA) scans revealed cortical defects in 17 (21.3%) infants while voiding cystourethrography revealed vesicoureteral reflux in 6 (46.2%) infants. Conclusion: Co-existing bacterial meningitis was not observed in young infants with UTIs. LP could not be routinely performed considering the clinical condition of <90 days old UTI patients.

• Journal of Digital Convergence
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• v.19 no.10
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• pp.265-274
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• 2021

This study empirically analyzed the users' experiences with the Netflix thumbnail curation based on the Technology Acceptance Model(TAM). According to the correlation analysis results, the higher the dependence on the thumbnails, the higher the satisfaction with the thumbnail curation. Both Perceived Informational Usefulness(PIU) and Perceived Ease of Use(PEOU) had correlations with the degree of satisfaction with the thumbnail curation. In particular, the factors of relevance in PEOU had the greatest impact on the degree of satisfaction and this result proved that the suitability factors of the thumbnails had significant correlations with the degree of satisfaction. The degree of satisfaction with the thumbnail curation also positively correlated with Netflix's overall degree of satisfaction and behavioral intention to use the Netflix. This study demonstrated the suitability of the TAM as a UX evaluation tool for the Netflix thumbnail curation.

• Journal of the Korean Society for Library and Information Science
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• v.57 no.1
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• pp.69-92
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• 2023

The purpose of the present study is to investigate the quality attributes of archival information service affecting user satisfaction. The independent variables in this study were equality, tangibles(appearance), convenience, responsiveness, empathy. And the dependent variable was a user satisfaction. The survey was conducted by online and offline for 78 people that used the archival information service. To solve the research question, we used the descriptive statistics, correlation analysis, multiple regression analysis. As a correlation analysis result, the quality attributes of archival information service had positive correlation with a user satisfaction. And as a multiple regression analysis result, tangibles(appearance) had a significant effect, followed by empathy and convenience. For improving on quality of archival information service, it is required that improving facilities, keeping environment clean, enhancing empathy ability, updating the information of archive, reforming search tools.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.18 no.6
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• pp.137-154
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• 2019

This study analysed the center control emergency vehicle preemption[EVP] test result on the 1.782 km section around Gangbuk Fire Station. The pros and cons between center control and site control EVP was compared through the review of existing research. The test site was selected based on the higher link speed for choosing low congested area and 4 to 6 lane road. EVP operates green extension under the estimated arrival time to each intersection. This study is about EVP system field application and its evaluation by analyzing EVP operation result with the emergency vehicle's trace, GPS data. The impact on the surrounding traffic was analysed in delay from the queue length survey. Analysis showed the decrease in averge travel time 41.81%, but the increase in delay of surrounding traffic slightly. It is expected that EVP can be applied to the expanded area by researching EVP compensation scheme.