• 한국도서관정보학회지
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• 제51권1호
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• pp.255-279
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• 2020

최근 공공데이터를 활용하는 이용자의 범위가 전문가부터 학생, 정부 관계자, 일반 시민까지 확대됨에 따라, 공공데이터포털의 역할도 변화하고 있다. 과거의 포털은 단순한 데이터 저장소(Data Repository)로서의 역할에 치우쳐 시민의 참여를 통한 데이터 활용을 높이는 데에는 다소 소홀하였다면, 현재는 이용자가 적극적으로 데이터를 활용할 수 있도록 이해·협업·공유 가치에 방점을 두는 추세이다. 이러한 사회적 흐름에 부응하기 위해 공공데이터 포털은 시민의 참여를 장려할 수 있는 이용자 중심의 서비스 개선 방안을 모색할 필요가 있다. 이에 본 연구는 공공데이터포털에 시민참여를 위한 주요 기능을 규명하고 현재 운영 중인 공공데이터포털 이용자 서비스의 현황을 분석하여 그에 따른 개선방안 제시를 최종 목적으로 한다. 이를 위해 먼저, 문헌 조사를 통해 시민참여를 위해 포털 서비스에서 제공되고 있는 기능들을 조사하고 분류하여 이용자 서비스 유형을 도출한 후, 이를 기준으로 국내외 공공데이터포털 이용자 서비스 현황을 분석하였다. 이를 통해 공공데이터포털이 제공하는 이용자 서비스의 문제점과 방향성에 대한 시사점을 도출한 후 시민참여를 위한 이용자 중심의 공공데이터 포털 서비스 개선방안을 제안하였다.

• 한국의학물리학회지:의학물리
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• 제30권4호
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• pp.128-138
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• 2019

Purpose: Segmental analysis of volumetric modulated arc therapy (VMAT) is not clinically used for compositional error source evaluation. Instead, dose verification is routinely used for plan-specific quality assurance (QA). While this approach identifies the resultant error, it does not specify which machine parameter was responsible for the error. In this research study, we adopted an approach for the segmental analysis of VMAT as a part of machine QA of linear accelerator (LINAC). Methods: Two portal dose QA plans were generated for VMAT QA: a) for full arc and b) for the arc, which was segmented in 12 subsegments. We investigated the multileaf collimator (MLC) position and dosimetric accuracy in the full and segmented arc delivery schemes. A MATLAB program was used to calculate the MLC position error from the data in the dynalog file. The Gamma passing rate (GPR) and the measured to planned dose difference (DD) in each pixel of the electronic portal imaging device was the measurement for dosimetric accuracy. The eclipse treatment planning system and a MATLAB program were used to calculate the dosimetric accuracy. Results: The maximum root-mean-square error of the MLC positions were <1 mm. The GPR was within the range of 98%-99.7% and was similar in both types of VMAT delivery. In general, the DD was <5 calibration units in both full arcs. A similar DD distribution was found for continuous arc and segmented arcs sums. Exceedingly high DD were not observed in any of the arc segment delivery schemes. The LINAC performance was acceptable regarding the execution of the VMAT QA plan. Conclusions: The segmental analysis proposed in this study is expected to be useful for the prediction of the delivery of the VMAT in relation to the gantry angle. We thus recommend the use of segmental analysis of VMAT as part of the regular QA.

• Asian Pacific Journal of Cancer Prevention
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• 제15권4호
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• pp.1649-1654
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• 2014

Background: Clinically significant portal hypertension (PHT) is considered as a contraindication for hepatectomy according to the guidelines of the European Association for Study of Liver and the American Association for Study of Liver Diseases. However, this issue remains controversial. Here we performed a metaanalysis to evaluate the impact of PHT on the results of hepatectomy for hepatocellular carcinoma (HCC). Methods: Cohort studies evaluating the impact of clinically significant PHT, defined as oesophageal varices and/or splenomegaly associated with thrombocytopenia, on the results of hepatectomy for HCC were identified using a predefined search strategy. Summary risk ratios (RRs) and 95% confidence intervals (95% CIs) for PHT and outcomes after hepatectomy for HCC were calculated. Results: Seven cohort studies which including 574 cases with PHT and 1,354 cases without PHT were considered eligible for inclusion. The meta-analysis showed that, in all patients, pooled RRs of post-operative liver failure, post-operative ascites, peri-operative blood transfusion, operative mortality, 3- and 5-year overall survival associated with PHT were 2.23 (95% CI: 1.48-3.34, P=0.0001), 1.77 (95% CI: 1.19-2.64, P=0.005), 1.23 (95% CI: 1.03-1.49, P=0.03), 2.58 (95% CI: 1.12-5.96, P=0.03), 0.82 (95% CI: 0.75-0.88, P<0.00001) and 0.76 (95% CI: 0.69-0.85, P<0.00001), respectively. In subgroup analysis, similar results were found in Child-Pugh class A patients. Conclusion: This meta-analysis suggests that presence of oesophageal varices and/or splenomegaly associated with thrombocytopenia is associated with higher rates of post-operative complications and poor long-term survival after hepatectomy for HCC.

• Nuclear Engineering and Technology
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• 제53권3호
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• pp.1013-1019
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• 2021

This paper reviewed the temporal changes in the public opinions on nuclear energy in Korea with a big data analysis of nuclear energy-related articles and their comments posted on the portal site NAVER. All articles that included at least one of "nuclear energy," "nuclear power plant (NPP)," "nuclear power phase-out," or "anti-nuclear" in their titles or main text were extracted from those posted on NAVER in January 2010-December 2019. First, we performed annual word frequency analysis to identify what words had appeared most frequently in the articles. For that period, the most frequent words were "NPP," "nuclear energy," and "energy." In addition, "safety" has remained in the upper ranks since the Fukushima NPP accident. Then, we performed sentiment analysis of the pre-processed articles. The sentiment analysis showed that positive-tone articles have been reported more frequently than negativetone over the entire analysis period. Last, we performed sentiment analysis of the comments on the articles to examine the public's intention regarding nuclear issues. The analysis showed that the number of negative comments to articles each month-irrespective of positive or negative tone-was always larger than that of positive comments over the entire analysis period.

• Radiation Oncology Journal
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• 제14권1호
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• pp.69-76
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• 1996

목적 : electronic portal imaging device(EPID)를 이용하여 폐암 환자에서 시행한 검증 영상을 분석하여 3차원 입체 조형치료계획 시 자세 오차(set-up error)와 종양의 이동 거리를 고려한 적절한 차폐 여유를 평가해 보고자 한다. 대상 및 방법 : 1995년 연세암센터 치료방사선과에 내원하여 EPID가 장착된 Clinac 2100C/D를 이용하여 치료받은 폐암 환자 10명을 대상으로 하였다. 환자 1인 당 1 port에 대한 검증 영상을 매일 얻어 random 오차와 systematic 오차를 구했고, 치료 1회 당 중복 영상을 얻어 종양의 움직임을 구했다. 매일 얻은 검증 영상은 103개이었고, 중복 영상은 10개이었다. 결과 : 전체 10 명의 환자의 x 축, y 축으로의 평균 이동은 각각 1.41 mm, 1.78 mm 이었고 systematic 이동은 표준편차가 x 축, y 축으로 각각 4.63 mm, 4.11 mm이었다. random 이동은 각 환자의 평균 이동으로부터 x 축, y 축으로 표준편차가 각각 4.17 mm, 3.31 mm 이었다. 호흡에 의한 y 축으로의 이동은 평균 12.2 mm이었고, 표준편차는 4.03 mm 이었다. 결론 : 폐암 환자에서 3차원 방사선치료를 시행하려고 할 경우 치료 계획 시 clinical target volume에서 x, y 축으로 각각 10 mm, 25 mm 정도의 여유가 필요하다고 보이며, 치료 초기에 각 환자별로 매일 EPID를 이용하여 얻은 검증 영상과, 중복 영상으로 차폐 여유를 적절히 조절해 주어야 할 것이다.

• 디지털산업정보학회논문지
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• 제6권2호
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• pp.71-80
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• 2010

This thesis is purposed on developing security product co-evaluation statistics administrate program which is can administrate or analysis CC accreditation product using by DEVS modeling via portal site of member of CCRA. Via developing security product evaluation statistics administrate program, it can analysis the trend of all countries of the world in many ways, and noticed the ways of evaluation and accreditation of most countries via scheme analysis. Except this, it can analysis the situation of accreditation trend of any countries via data analysis of ICCC 2009. Also, For trend analysis to evaluation technique of CCRA member, it analyzed up to date technology and policy of the evaluation organization and the Certification Authority of most countries. And it peformed analysis the most trend of information security of evaluation authorization in CCRA member countries. In this program, It provide the function of trend statistics analysis which can statically analyzed the evaluation accreditation trends of most countries and automatical statistics by categorization ( by Product, Class and statistics in national) and report creation functions which can easily extraction and use the needed data. It has been updated the related informations until latest accredited product using by CC(Common Criteria) portal home page's data.

• Asian Pacific Journal of Cancer Prevention
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• 제13권2호
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• pp.483-486
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• 2012

Background: The hepatocellular carcinoma is very common in China. Our aim in this report was to investigate clinical and pathological factors based on the current decade data that could influence prognosis of HCC patients after hepatectomy. Methods: Between 2002 and 2009, all patients undergoing hepatectomy for HCC were followed up and reviewed retrospectively. Prognostic factors were studied by univariate and multivariate analysis, with Kaplan-Meier and Cox multivariate survival analyses. Results: Complete clinicopathologic and follow-up data were available for 114 patients. The estimated cumulative survival rates at 1, 3, and 5 yr were 84.6%, 60.2% and 51.8%, respectively. On univariate analysis, key prognostic factors were AFP level, GGT level, tumor size, number of tumors, portal vein invasion, liver cirrhosis status and TNM stage. In the multivariate analysis, tumor size, GGT level, liver cirrhosis status and portal vein invasion were significantly associated with patients' prognosis. Conclusion: Through follow-up of a relatively large cohort of Chinese patients, tumor size, GGT level, liver cirrhosis status, portal vein invasion were revealed as important factors for long-term survival after hepatectomy. Early diagnosis for tumor and the improvement of liver function before surgery are important ways to improve the prognosis.

• 디지털융복합연구
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• 제19권2호
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• pp.231-238
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• 2021

SNS는 데이터를 통해 사용자의 생각이나 행동을 파악할 수 있고 검색포털의 트렌드는 사용자들의 관심사와 그 변화를 파악할 수 있는 대표적인 서비스이다. 본 논문에서는 SNS의 트윗과 검색포털 트렌드에 마약류관련 단어 노출정도와 마약류 사건 통계와의 비교분석을 수행하여 관계를 분석하였다. SNS와 검색 포털 트렌드의 추이가 일정한 시차를 두고 검찰청 통계에도 동일하게 나타난 것을 확인할 수 있었다. 또한 마약류관련 단어들이 언급된 트윗들에 대한 의미를 파악하기 위해 군집분석을 수행하였다. 2020년 10월에 수집된 5만건 트윗에서는 실제 마약류의 판매에 관련된 의미를 찾을 수 있었다. 이를 통해 SNS모니터링만으로도 마약류관련 사건에 대한 모니터링이 가능하고 구체적 판매 또는 구매관련한 정보를 찾을 수 있고 수사과정에 활용할 수 있다. 추후에는 텍스트뿐 아니라 이미지로 나타나는 관련 범죄사항을 파악할 수 있고 범죄모니터링 및 예측시스템을 제안할 수 있다.

• 대한가정학회지
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• 제41권4호
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• pp.21-33
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• 2003

The purpose of this study was to give early childhood educators information for differentiating internet information services related to early childhood education, and for making more positive educational effect with web information services. The main questions were there were and differences in the levels of information characteristics and the information contents according to the categories of those sites. The subjects were 47 internet sites frequently used by teachers and trained assistants rated them with rating scale. One way ANOVA and t-test were used for data analysis. The results showed that the levels of information characteristics dimensions had differences among the categories of sites. In addition to that the content quality of Portal sites were higher than those of other categories for children users, those of Portal sites and Daum Cafes were higher than corresponding quality of other sites for teachers.

• Nuclear Engineering and Technology
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• 제53권6호
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• pp.2046-2055
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• 2021

This paper analyzed the primary concerns about radiation among the Korean public with a big data analysis of questions posted at the section of "Knowledge iN" on the portal site NAVER in Korea from January 2010 to August 2020. First, we extracted questions about radiation and categorized them into the three categories with TF-IDF analysis: "Medical," "Career Counseling," and "General Interest". The "Medical" category includes questions about radiation diagnosis or treatment. The "Career Counseling" category includes questions about entering college and the prospect of finding jobs in radiation-related fields. The "General Interest" category includes questions about terminology and the basic knowledge of radiation or radioisotopes. Second, we extracted common questions for each category. Finally, we analyzed the temporal change in the numbers of questions for each category to confirm whether there is any correlation between radiation-related events and the number of questions. The analysis results demonstrate that major radiation-related events have little relevance to the number of questions except during March 2011.