• Electronics and Telecommunications Trends
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• v.17 no.3 s.75
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• pp.87-94
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• 2002

1990년대 중반 이후, 우리나라 뿐만 아니라 세계적으로 이동통신시장이 급격히 성장하고 있다. 이에 따라 고정전화에서 이동전화로 통화할 때 내는(LM 통화요금)의 적정성을 둘러싸고 사업자간의 의견 대립이 증가하면서, 이 요금의 인하 문제가 전 세계적으로 정보통신 산업계의 중요한 이슈로 등장하고 있다. 최근 영국의 규제 기관인 OFTEL은 이동통신 사업자들에게 LM 착신 접속요금을 인하하기 위한 권고 안을 발표하였다. 본 논문에서는 영국의 현행 LM 요금제도의 현황과 OFTEL이 제안한 권고 안의 주요 내용 및 이 안에 대한 이동통신 사업자들의 반응을 살펴보고, 이어서 우리나라 LM 요금정책에의 시사점을 제시하고자 한다.

• The Journal of the Korea Contents Association
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• v.21 no.6
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• pp.306-317
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• 2021

With a global shift from carbon economy towards hydrogen economy, leading countries such as the U.S., Europe, China, and Japan are focusing their research capabilities on hydrogen research and development(R&D) by announcing various hydrogen economy policies. South Korea also has been following this global trend by announcing hydrogen economy roadmap in January 2019 and legislating hydrogen economy related law. In this paper, we tried to figure out the national R&D trend of Fuel Cell Electric Vehicle(FCEV) and its knowledge structure by using recent 10-year project data of National Technology and Information Service(NTIS). We collected 1,479 FCEV-related projects and conducted text mining and network analysis. According to the analysis, FCEV-related R&D has been actively carried out over the entire process of hydrogen production, transport, storage, and utilization. Furthermore, the paper provides insights into the government's policy agenda building and market strategy on the hydrogen economy.

• Korean Journal of Cognitive Science
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• v.15 no.3
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• pp.1-14
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• 2004

This research examined the effects of individual differences on visual discrimination skill teaming and its transfer to novel stimuli. Individual participants were categorized as having an analytic or holistic cognitive style, high or low working memory capacity, and high or low levels of rationality, experientiality, and adaptive decision-making styles. Participants received easy or difficult training for the serially presented discrimination task, and then transferred to novel discriminations. Training content interacted with cognitive style and working memory capacity to affect transfer accuracy performance, but individual differences in decision-making styles did not affect transfer performance. Results suggest individual differences should be taken into account when designing an interface for visual discrimination.

• Journal of the Korean Society of Radiology
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• v.83 no.3
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• pp.620-631
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• 2022

Purpose This study aimed to investigate the diagnostic performance of features suggestive of nodal metastasis on preoperative MRI in patients with invasive breast cancer. Materials and Methods We retrospectively reviewed the preoperative breast MRI of 192 consecutive patients with surgically proven invasive breast cancer. We analyzed MRI findings of axillary lymph nodes with regard to the size, long/short ratio, cortical thickness, shape and margin of the cortex, loss of hilum, asymmetry, signal intensity (SI) on T2-weighted images (T2WI), degree of enhancement in the early phase, and enhancement kinetics. Receiver operating characteristic (ROC) analysis, chi-square test, t test, and McNemar's test were used for statistical analysis. Results Increased shorter diameter, uneven cortical shape, increased cortical thickness, loss of hilum, asymmetry, irregular cortical margin, and low SI on T2WI were significantly suggestive of metastasis. ROC analysis revealed the cutoff value for the shorter diameter and cortical thickness as 8.05 mm and 2.75 mm, respectively. Increased cortical thickness (> 2.75 mm) and uneven cortical shape showed significantly higher sensitivity than other findings in McNemar's test. Irregular cortical margins showed the highest specificity (100%). Conclusion Cortical thickness > 2.75 mm and uneven cortical shape are more sensitive parameters than other findings, and an irregular cortical margin is the most specific parameter for predicting axillary metastasis in patients with invasive breast cancer.

• Journal of the Korean School Mathematics Society
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• v.13 no.3
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• pp.381-395
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• 2010

The purpose of this paper is to examine the competence and the methods of problem solving in four operations word problems based on the informal knowledges by five-year-old children. The numbers which are contained in problems consist of the numbers bigger than 5 and smaller than 10. The subjects were 21 five-year-old children who didn't learn four operations. The interview with observation was used in this research. Researcher gave the various materials to children and permitted to use them for problem solving. And researcher read the word problems to children and children solved the problems. The results are as follows: five-year-old children have the competence of problem solving in four operations word problems. They used mental computation or counting all materials strategy in addition problem. The methods of problem solving were similar to that of addition in subtraction, multiplication and division, but the rate of success was different. Children performed poor1y in division word problems. According to this research, we know that kindergarten educators should be interested in children's informal knowledges of four operations including shapes, patterns, statistics and probability. For this, it is needed to developed the curriculum and programs for informal mathematical experiences.

• Korean Journal of Food Science and Technology
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• v.45 no.4
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• pp.478-487
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• 2013

Onions were treated with different amounts of sulfur (S) during cultivation and examined for their physicochemical properties and flavor. Onions cultivated without S application were the control group; the treatment groups were grown in soil that had been pretreated with S and received additional S applications or four times before harvest. As the number of S applications increased, the levels of crude protein, quantified with total nitrogen; ash, approximating total amounts of minerals; and dietary fiber of the onions tended to increase. The mineral compositions also improved, with noticeable increases in the levels of Mg, K, Fe, and Zn. In particular, the reducing capacity of the onions increased appreciably (p<0.05), without increases in the levels of S-containing compounds such as thiosulfinate or S-containing amino acids. Nevertheless, the spicy hot taste and flavor, which is generated mainly from S-containing compounds, were perceived more strongly in the onions that had received more S applications.

• 식품문화 한맛한얼
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• v.3 no.2
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• pp.126-142
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• 2010

소련에서 이산에 의한 고려 사람들의 음식문화의 확산에 대한 논의는 현재 추진하고 있는 '한식의 세계화'에 시사하는 점이 많을 것이다. 따라서 본 내용은 1991년 소련이 해체되기 전후 두 차례에 걸쳐서 약 1년간 소련의 여러 지역을 여행하고, 또 소련이 해체된 후 1999년에 다시 이 지역에서 잠시 거주했던 필자의 경험과 이 지역 사람들과의 인터뷰를 통해 얻은 자료, 문헌연구 등을 바탕으로 고려 음식이 어떻게 구소련 전 지역으로 퍼지게 되었는지 그 요인을 살펴보고자 한다.

• Cement
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• s.195
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• pp.42-45
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• 2012

소프트웨어와의 융합을 통한 새로운 가치 창출이 모든 산업에서 핵심 경쟁요소로 부각되고 있다. 이러한 가운데 최근 건설산업도 BIM(Building Information Modeling)과 스마트 하우스 스마트 빌딩 등을 중심으로 소프트웨어와의 융합 급진전되고 있다. 건설사업 추진 과정에서 소프트웨어 업체들과의 전략적 제휴도 확산 추세를 보이고 있다. 건설과 소프트웨어와의 융합은 세계적 트렌드로 경쟁력 확보를 위해 이러한 추세에 적극 대응해 나가야 할 것이다. 여기서는 여기서는 포스코경영연구소 한강수 패밀리경영연구센터 책임연구원의 '건설산업의 신트렌드 HW와 SW의 결합' 보고서를 통해 건설산업과 소프트웨어와 융합화 동향과 시사점에 대해 살펴본다.

• Electronics and Telecommunications Trends
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• v.13 no.2 s.50
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• pp.90-102
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• 1998

본 고는 국내 통신사업자의 대외개방에 적극적으로 대응하기 위해서는 해외사업을 통한 적극적인 국제화 노력이 필요하다는 인식 하에 전략전 관점에서 다국적화 단계에 있는 Singapore Telecom, Telstra, Telefonica 및 글로벌 단계에 있는 British Telecom 등 외국 통신사업자들의 해외사업진출 현황과 전략을 분석하여 국내 통신사업자의 해외사업진출에 대한 시사점을 제시하였다.

• 방재와보험
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• s.36
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• pp.70-73
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• 1988

인구의 도시 집중화 현상에 따라 도시는 고층화.조밀화 되고 또한 지하시대가 개막되어 많은 판매시설과 교통시설이 지하로 들어가게 된다. 이러한 현상이 선진국에서는 이미 1세기 전부터 이루어져서 많은 편리함과 함꼐 많은 위험성도 내포하고 있다. 30여명이 순식간에 사망한 King's Cross 지하철역 화재사례는 이유용 방재시험소 소장이 구미 출장시 현지에서 긴급 입수한 자료를 요약 정리한 것으로 지하시대가 개막되는 우리나라에 많은 내용을 시사하고 있어 게재하고자 한다.