• The Mathematical Education
• /
• v.36 no.1
• /
• pp.77-87
• /
• 1997

6차 교육과정이 추구하는 인간상의 하나가 "창의적 사람"이다(대천 교육청, 1994). 앞으로 다가올 21세기는 정보화 사회, 다원화 사회, 세계화 사회가 될 것으로 전망되며, 국가간의 무한 경쟁 시대에 대처하기 위해서는 종래의 방법과 가치관에 의한 교육의 틀에서 탈피하여, 창의력을 기르는 교수-학습 지도 방법이 있어야 할 것이다.(중략)할 것이다.(중략)

• Geophysics and Geophysical Exploration
• /
• v.13 no.3
• /
• pp.219-226
• /
• 2010

Current earthquake alert notification for immediate post-earthquake procedures for the critical facilities is exclusively dependent on the ground-motion intensity measures observed at the seismic station located within the site. This practice is prune to false notification due to a noise and problems of missing and poor quality records of the seismic station. The credibility of the earthquake alert notification can be enhanced by utilizing the multiple transformed records of the nearby seismic stations at other sites interconnected to the same earthquake monitoring system by a network. The time-domain transformation of the site-response between the seismic stations is implemented by convoluting the nearby records with a pair of forward and inverse FIR filters designed for the site response relative to a seismic basement. The transformed records from the nearby seismic stations can be used to estimate the ground-motion intensity measures missing at the site or to evaluate the data quality along with other various possible applications in the area of geoscience and earthquake engineering.

• Progress in Medical Physics
• /
• v.12 no.1
• /
• pp.9-17
• /
• 2001

The prior purpose of this study is to introduce a optical biopsy and evaluate whether the optical biopsy, real-time, non-invasive technique, is a reliable tool to assess response to radiotherapy Four healthy volunteers, and four patients with inflammatory conditions of the oral cavity participated on the study. was obtained from each person enrolled in the study. Using FastEEM(Ercited Emission Matrix) as a optical biopsy tool, normal and tumor spectra are taken from the normal and the tumor regions. And then second optical biopsy are taken from the tumor regions in 4 patients with time delay at 7days.. Using a diagnostic algorithm, made by Gillenwater based on spectra excited at 337nm The Optical Biopsy turned out to be more suited for tumor diagnostic resulting in significant difference fluorescence spectra. The fluorescence intensity of cancerous tissue showed a higher position. The second fluorescence intensity of optical biopsy of cancerous oral tissue has more smaller than the first result. I conclude that optical biopsy, which technique don't need to remove tissue sample from body, and is a real time , and non-invasive measurement is a reliable tool to access to radiotherapy because FastEEM can do measure the variation of the tissue composition chemical, biological, and morphological after radiotherapy. Based on the fluorescence spectrum are taken from the optical biopsy in normal and tumor spectra as well as tumor spectra after 7days.

• Journal of the Korean Society of Radiology
• /
• v.18 no.4
• /
• pp.383-389
• /
• 2024

In this study, we aimed to analyze the probability of secondary cancer occurring in the abdomen, a normal organ, due to photoneutron exposure during intensity-modulated radiotherapy for prostate cancer. The design of the radiation treatment plan for prostate cancer was established as a daily prescription dose of 220 cGy, a total of 35 treatments, and 7700 cGy. The experimental equipment was a True Beam STx (Varian, USA) linear accelerator from Varian. The energy used in the experiment was 15 MV, and the treatment plan was designed so that the photoneutron dose would be generated within the planning target volume (PTV). The radiation treatment plan was an Eclipse System (Varian Ver. 10.0, USA), and the number of irradiation portals was set to 5 to 9. The irradiation angle was designed so that 95% of the prescription dose area was set to 0 to 320°, and the number of beamlets per irradiation portal was set to 100. The optically stimulated luminescence dosimeter used in this study to measure the dose of photoneutrons was designed to measure photoneutron doses by coating ⁶LiCO₃ on a device containing aluminum oxide components. It was studied that there is a minimum of 7.07 to 11 cases per 1,000 people with secondary cancer due to the photoneutron dose to the abdomen during intensity-modulated radiotherapy. In this study, we studied the risk of secondary radiation dose that may occur during intensity-modulated radiotherapy, and we expect that this will be used as meaningful data related to the probabilistic effects of radiation in the future.

• Journal for History of Mathematics
• /
• v.26 no.1
• /
• pp.21-32
• /
• 2013

The outbreak of the First and the Second World Wars cast great shadow across the Europe including mathematical society. The IMU led by French mathematicians after the First World War ceased to exist because it was used politically. As Europe ran into the Second World War, all the international mathematical activities were ceased. Prominent mathematicians were put into camp by Nazi or moved to the United States of America. After the war, European mathematicians did not have capacity to represent the international mathematical society anymore. This led Stone and other American mathematicians to form the new IMU, which was independent of political ideology. This paper studies the birth process of the new IMU after the War and some major events that happened to ICM in 1950s.

• Proceedings of the Optical Society of Korea Conference
• /
• 2002.07a
• /
• pp.104-105
• /
• 2002

Hyper-Rayleigh scattering(HRS)방법을 이용하여 쌍극자와 새로이 합성된 팔중극자들의 1차 초분극율 $\beta$를 측정하였다. External reference 법을 이용하였고, reference 물질로는 잘 알려져 있는 쌍극자인 PNA를 이용하여 Disperse Red 1과 팔중극자들의 1차 초분극율 $\beta$의 값을 구하였다. 또한 HRS 의 세기뿐만 아니라 이들 물질의 two-photon induced fluorescence 스펙트럼을 측정하였다. 1차 초분극율 $\beta$값은, 먼저 시료로부터 scattering 된 신호를 파장변화에 따른 스펙트럼으로 측정하여 two-photon induced fluorescence를 뺀 순수한 HRS 신호만을 이용하고, 실험에 사용된 물질들은 532nm에서 흡수가 있어 second harmonic generation 신호가 시료에 의해 흡수가 되므로 흡수효과를 식 $I_{2{\omega}}$(obs)= $I_{2{\omega}}$(true) $e^{-{\sigma}lN}$ ---(1)를 이용하여 흡수에 의한 신호의 감소 효과를 보정하여 값을 구했다. (중략)

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2016.06a
• /
• pp.356-358
• /
• 2016

본 논문에서는 동공 검출 기반 눈 검출 및 추적 시스템을 구현하기 위한 방법의 최적 조건을 제안한다. 이러한 시스템을 구현하려면, 구현하기 위해 사용하는 동공 명암 차 현상이 어떠한 환경과 시스템을 갖춰야 하는지에 대한 정보가 필요하다. 본 논문에서는 어떠한 조건에서 동공 명암 차 현상이 확실하게 검출이 되는지를 실험하였다. 실험결과 본 논문의 실험 환경내에서 카메라 렌즈와 눈 사이의 거리가 60cm에서 80cm사이일 때, 조명의 세기가 강할수록 동공 명암 차 현상이 강인하게 검출되는 것을 확인하였다.

• 한국전기화학회:학술대회논문집
• /
• 2004.06a
• /
• pp.141-148
• /
• 2004

지구의 환경보존과 에너지원의 효율적인 이용을 위하여 고효율의 환경친화적 청정에너지 기술개발을 활발이 진행중에 있으며, 이중 수소를 이용한 연료전지차 개발이 최근 가장 각광을 받고 있다. 연료전지차 실용화를 위해서는 여러 가지 기술적으로 해결해야 과제가 많으나, 그 중에서도 연료로 사용하고 있는 수소의 안전적인 저장 문제가 중요하다고 하겠다. 수소를 저장하는 방법은 여러 가지 있으나, 현재 기술로 이용 가능한 것은 압축저장 방식이다. 현재 소개되고 있는 연료전지차 대부분에는 350 bar 압축수소저장용기가 탑재되어 $120\~300km$까지 주행이 가능하다. 이는 소비자 입장에서 수소충전을 자주해야 하는 불편사항이다. 이를 보완하기 위해서 초고압 (700 bar) 수소저장시스템과 저압이면서 수소를 더 많이 저장할 수 있는 신 수소저장물질 개발을 각 연구기관에서 활발이 연구중에 있다. 국내에서도 최근에 연료전지차의 관심이 높아지면서 연료전지차량용 부품 개발을 정부과제로 연구중이거나 예정이다. 수소저장분야도 21세기 프론티어사업을 통하여 산.학.연 합동으로 연구를 활발이 진행중에 있다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.36 no.5C
• /
• pp.309-316
• /
• 2011

In this paper, equalization zone of two crosstalk cancellation (CC) schemes, which are the one based on only head related transfer function (HRTF) and the other one based on interaural intensity/time difference (ITD/IID) as well as HRTF is studied. To do this, the condition numbers and ITD/IID levels of two schemes are shown.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.46 no.8
• /
• pp.679-686
• /
• 2018

In previous paper[1], the authors had compared the current status of European and US rotorcraft development status. In this paper, more detailed procedures have been studied how the European rotorcraft technologies are developed preparing for 21 st century to be more competitive to US. For the systematic procedure to develop next generation aviation technologies including rotorcraft, the pan-European organization, ACARE, was established, and proposed major research agenda for next generation aviation technologies and businesses. Based on the proposed research agenda, all the R&D programs supported by EU are reorganized to be more efficient and competitive. The procedures for the rotorcraft technologies are, first, cabin noise/vibration reduction program (FRIENDCOPTER), second, core technologies to increase of rotor efficiencies and reduce rotor noise (GRC), and then finally to develop fast/long-range next generation rotorcraft (Fast Rotorcraft). As mentioned in previously, all the R&D procedure has to satisfy basic research agenda especially the environmental impact. With theses procedure, the European rotorcraft business had successful achievements not only in current and future market share, but also preparing for next generation rotorcraft platform such as compound and tilt-rotor rotorcraft satisfying market needs.