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강승민(SeungMin Kang),박병규(ByungGyu Park),이성우(SungWoo Lee),안익현(IkHyeon Ahn),조민규(MinGyu Jo),최명현(MyeongHeon Choe),강태원(TaeWon Kang) 한국정보기술학회 2020 Proceedings of KIIT Conference Vol.2020 No.10
코로나(Covid-19)로 의심되는 증상에 대한 서술을 수집하여 양성 서술과 음성 서술로 구분한다. 이렇게 구분한 데이터에 대해 각 서술에 단어가 출현하는 빈도를 계산하여 베이즈 분류기를 만든다. 이렇게 생성한 분류기로 새로운 증상에 대한 서술을 분류하여 환자의 감염 여부를 판단한다. 실험 결과 학습 데이터의 89%, 검증데이터의 52%를 분류할 수 있었다. Descriptions of symptoms suspected of coronavirus (Covid-19) are collected and classified into positive and negative statements. For the separated data, the Bayesian classifier is created by calculating the frequency of occurrence of words in each description. With the classifier created in this way, the description of the new symptom is classified to determine whether the patient is infected. As a result of the experiment, 89% of the learning data and 52% of the verification data could be classified.
선체구조용 EH36 TMCP 후판의 FCAW 및 EGW 조합 용접부 기계적 성질에 미치는 개선조건의 영향
김기혁(Kihyuk Kim),김기원(Kiwon Kim),심호섭(Hoseop Sim),배강호(Kangho Bae),홍현욱(Hyunuk Hong),박병규(Byunggyu Park) 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.5
Characterization of microstructures and mechanical properties of 83mm thickness EH36-TM welds produced by the combined flux cored arc (FCA) and electro gas (EG) welding processes has been studied with the two different groove conditions, single-V (SV) and double-V (DV) bevels. The welding consumables used for FCA and EG welding processes were ASME/AWS A5.29 (E81T1-K2) and A5.26 (EG72T), respectively. Experimental results showed that all the mechanical properties of welds such as tensile property, CVN toughness and Vickers hardness met IACS requirements. The tensile strength of EG welded plates were reduced by approximately 4% (DV: 3.8%, SV: 4.2%) compared to the base metal. The hardness value of SV-beveled weld metal was slightly lower than that of DV-beveled one. There were no significant differences as per welding groove conditions except for the weld metal. In addition, at the fusion line, the toughness of SV condition was 20J lower and the weld metal was 40J lower than DV condition, respectively. On the basis of microstructural analysis, grain boundary ferrite (GBF) structures for SV condition were 2 times higher volume fraction than for DV condition and their packet sizes were coarsened to almost double. It was thus suggested that the GBF volume fractions and packet sizes in the weld metal of EH36-TM steel plates are the most important factors affecting the mechanical properties of the combined FCA and EG welded joint. Nevertheless, all the results of welds with both DV and SV conditions were found to be excellent.
Preparation and Structure of [Re(=0)Cl_4(PPh_3)][HNEt_3]
Kim, Youngwoong,Park, Byunggyu,ParK, Heesook,Lee, Soonwon 성균관대학교 기초과학연구소 1994 論文集 Vol.45 No.2
mer, trans-Re(=O)(PPh_3)_2Cl_3, I, 과 2,3,4,5,6-pentafluoroaniline (C_6F_5NH_2)을 triethylamine 및 trimethylsilyl chloride 존재하에서 반응시켰을때 염 형태의 [Re(=O)Cl_4(PPh_3)] [NHEt_3], II, 화합물을 얻었다. 이 화합물의 결정구조를 X-선회절법으로 규명하였다. 화합물은 단사정계로 결정화되었고, 공간군 P2_1/n, 단위세포 상수값들은 a=9.592(2)Å, b=31.380(4)Å, c=9.219(3)Å β=95.59(2)°이고, 그리고 한 단위세포 안에는 4 개의 분자들이 있었다. 2951개의 측정된 회절점들을 갖고 최소자승법으로 구조를 정밀화한 결과 R (wR_2) 값들은 0.0489(0.1111)이다. The reaction between mer, trans-Re(=O)(PPh_3)_2Cl_3, I, and 2,3,4,5,6-pentafluoroaniline (C_6F_5NH_2), in the presence of triethylamine (NEt_3) and trimethylsilyl chloride (TMSCl) at 75℃ produced [Re(=O)Cl_r(PPh_3)][HNEt_3], II, in a salt form. The crystal structure of II was determined through X-ray diffraction. II crystallized in the monoclinic system, space group P2_1/n with cell parameters a=9.592(2)Å, b=31.380(4)Å, c=9.219(3) Å, β=95.59(2)°, and Z=4. Least-squares refinement of the structure led to a R(wR_2) factor of 0.0489 (0.1111) for 2951 unique reflections of I>2 σ(I) and for 218 variables.