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송민종,김만기,김수현,장태규,김승범 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
최근 예측이 힘든 위험기상에 의해 기상예측 중요성이 한층 강조되고 있으며, 기상예보의 정확성도 나날이 중요해지고 있다. 그러나, 우수한 수치예보모델일지라도 계통적 오차가 존재하며, 이러한 계통적 오차는 예보 부정확성을 야기시킨다. 따라서, 계통오차를 최소화하고 보다 정확한 기상정보를 제공하고자 통계모델인 MOS(Model Output Statisitcs)등을 비롯하여 여러모델이 개발되어 예보의 성능을 향상시켜왔다. 하지만, 통계모델 개발시, 과거의 수많은 자료가 필요하다는 점과 시간비용이 크다는 한계를 가지고 있다. 본 연구에서는 2008년 10월을 시작으로 동네예보 서비스를 통해 제공되는 예보요소 중 지상습도에 대해 편차를 보정하여 습도의 예측성능을 개선하고자 한다. 예보지점 중 서울지점에 대해 편차보정모델을 개발하였고, 과학과 공학분야에서 많이 활용되고 있는 인공지능을 적용하여 개발하였다. 인공지능 모델은 시계열자료 해석이 가능하고, 특징추출이 뛰어난 Temporal Convolution Network (TCNs) 모델을 활용하였고, 모델개발에 사용하는 자료는 1시간 예보간격, 136시간 예측에 대한 5개년의 통합모델자료와 Automatic Weather station (AWS) 지상관측자료를 사용하였다. 인공지능 모델의 학습과 검증에는 전체 자료 중 약 80%의 자료를 이용하였고, 20% 자료는 평가에 사용하였다. 학습과 검증자료 분할 시, 학습과 검증자료의 특성을 유사하게 하여, 검증의 신뢰도를 향상시키고자 하였다. 모델개발에 사용하는 예보요소는 지상습도, 850 hPa 평균상대습도 및 불안정 지수를 비롯하여 총 13개의 예보 요소를 사용하였다. 인공지능 학습 및 검증 결과, 손실함수는 미소값으로 수렴하였고, 평가 결과는 인공지능모델이 통합모델에 비해 RMSE 및 BIAS에서 약 2%의 개선을 보였다.
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Teaching Reading by Using Out of Africa, Reading Activities, and an Eclectic Instructional Mode
송민종 영상영어교육학회 2014 영상영어교육 (STEM journal) Vol.15 No.2
This study investigates the benefits of using the movie Out of Africa (Pollack, 1985) to improve Korean college students’ motivation and achievement in reading English. It suggests practical reading activities to utilize the movie in the classroom. Together with the movie material and reading activities, the present study also discusses the adoption of an eclectic teaching method to enhance student learning. Until recently, reading classes have been taught with commercially-produced textbooks of standard English written materials, comprehension questions of display- or test type, incorporating the Grammar-Translation Method. While the limitations of the current reading lesson and the proprieties of the proposed lesson are discussed in depth, this study focuses on three points. First, the requirements for reading materials and the beneficial manner in which Out of Africa satisfies them are debated. Second, the procedures of reading activities for Out of Africa and their usefulness are discussed. On this point, the study proposes an interactive approach to reading and specifies pre-, during-, and post-reading activities. Third, an eclectic method is advocated within the framework of the Whole Language Approach. Further research topics are also suggested to strengthen the proposed alternative lesson.
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BaTiO₃계 세라믹의 미세구조와 유전 특성에 관한 연구
박춘배,송민종 圓光大學校 1995 論文集 Vol.29 No.2
BaTiO₃계 세라믹은 페로브스카이트 구조, 높은 유전상수, 그리고 낮은 전이 온도에서 저항에 대한 낮은 온도계수를 갖는 물질이다. 이 세라믹은 소결에 의해 제조된 다결정체로서 내부 구조적으로는 결정립, 입계, 입계내에 존재하는 절연층 및 기공등으로 구성되어 있다. BaCO₃와 TiO₂를 적당한 몰 비율로 조성하여 소결온도의 변화에 따른 시편의 미세구조 변화와 주파수 변화에 따른 유전특성을 고찰하였다. 주파수 변화에 대한 복소 유전율 특성 곡선에서 쌍극자 분극이 나타났으며, 유전분산이 10[MHz]부근에서 크게 일어났다. BaTiO₃has the Perovskite Structure, high dielectric constant and a small temperature coefficient of resistance due to it's low transition temperature(T =120℃). This ceramic system was composed with insulation layer and pore within the grain and grain boundary. It was fabrication in palycrystalline at sintering temperature. BaCO₃and TiO₃was composied mol percent, was showed microstructure in variable sintering temperature and Elecronic, dielectric properties in variable frequency. Polarization in complex dieletric loss factor for the variable frequency was showed bipole polarization, dielectric dispersion is large increase above 10 mega frequency.
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BaTiO₃계 세라믹의 원적외선 방사 및 전기적 특성에 관한 연구
송민종 광주보건대학 1998 論文集 Vol.23 No.-
There are several ways of trial to satisfy a demand of industry such as light and small devices. After the fact was known that controlled doping of rare earth oxides in barium titanate system represented semiconductivity showing high resistivity at currie temperature. The studies on the positive temperature coefficient of resistor(PTCR) thermistor have been continuously progressed. In this paper, radiation properties of a far-infrared using a PTCR thermistor were investigated for concentration of dopants. The preparation of specimen were accomplished by the mixed oxide method, and their composition consisted of the BaTiO3 + 1.67mol% Al₂O₃ + 3.75mol% TiO₂(1/3A1₂O₃ + xSi0₂ + (1-x) TiO₂ ; total x : 6.67mol%). The microstructure, crystal phase and thickness depended on the kinds of Sb₂O₃s additives. The average particle size of BaTiO3 system ceramics increased as in increasing the amount of Sb₂O₃ additives and reached the maximum grain boundary when the amount of Sb₂O₃ is 0.15mol%. A resistivity at room temperature was amount 10₂∼10₃ Ω-㎝ which was highly semiconductive, and it was about 10^(7)Ω-㎝ above critical temperature which was insulating.
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송민종,송재호,장일영 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
Box girders are adopted quite often for superstructures of highway bridges because its high torsional stiffness can lead to a transversely uniform distribution of flange stresses. AASHTO and AASHTO LRFD Specification are including provisions for wheel load distribution factors of steel box girder bridges, equations for distribution factors which are constituted only variables of lane number and girder number lead to quite approximate values. When dimensions of box girder bridge vary, even if number of traffic lane and number of girder are same, wheel load distribution factors vary significantly. It has been found out the calculated values equations of both American specifications may lead to unsafe or excess design. This study is performed regression analysis in order to propose wheel load distribution factor formulas which include many parameters, and to confirm the validity of the proposed formulas, its results are compared with established formulas.
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송민종,김진사 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.2
For the purpose of treating health checkups and recovery of patients in a super-aged society, hospitals use devices designed with a reduction circuit of electromagnetic waves associated with the specific absorption rate of electromagnetic waves absorbed by the human body. In this paper, we proposed a filter improvement design method capable of reducing electromagnetic waves. As a result of confirming the validity of the proposed technique through simulation and experimental results, the following result values were obtained. Applying the common-mode (CM) inductor 4 mH to a calibration circuit, noise decreased in a multiband spectrum. Using the differential mode(DM) inductor 40 μH element in the primary calibration circuit, the noise decreased by 15 dB or more in the 3 MHz band spectrum. Also, applying the Admittance Capacitance (Y-Cap) 10 nF element in the secondary calibration circuit resulted in the decrease by more than 30 dB in the band spectrum before 2 MHz. After using a common-mode inductor 4 mH element in the tertiary calibration circuit, it decreased by more than 15 dB in the band spectrum after 2 MHz.
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