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산업체(産業體) 부설(附設) 특별학급(特?學級)(학교(學校))의 과학교육운영실태(科學?育運營實態)와 개선방안(改善方案)
려수동 ( Soo Dong Yoh ),정원우 ( Won Woo Chuang ),박종환 ( Jong Hwan Park ),김은중 ( Un Kyung Kim ) 경북대학교 과학교육연구소 1991 科學敎育硏究誌 Vol.15 No.-
In order to understand the current situation and management of science education in the spe-cial classroom(school) managed by the firms, a census on administrative functions, instruction system, experimental facilities was taken on workers attending 17 Special Classes and 9 Special Schools located in Taegu City and Kyungpook Provincial. As a result, most students chose the subject “Science” as an option within their limited 8 units credits. About 88.5% of the students were female. About 78.3% of the classes/schools were conducted in the evening only. About 59. 4% of teaching staffs were prevailed with female in these classes, and most of them were young, naive, and unexperianced with their major in chemistry and physics. Insufficient facilities and equipments, crowded classes, understaffed instructors, and inappropriated text materials, etc., were reasons for the students not receiving maximum benefit from these classes and schools. Having inadequate time to perform and complete the scientific knowledge. This census data for the current situation established a need for bettering administrative and management functions for future development in the science class instructions, and should serve as a refer-ence for the future foundation of these kinds of special classes and schools.
TEM Investigation of Nitrided Inconel 690 Prepared by Low Temperature Plasma Assisted Processes
Xiaona Li,Chuang Dong,Henry Michelh,Huan He,Shengzhi Hao,Thierry Czerwiec 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Low-temperature plasma assisted nitriding (PAN) treatment was used to produce a highly nitrogen-enriched N layer on the nickel-based superalloy Inconel 690. Such a layer showed greatly improved wear and corrosion performance. In this paper, we investigate the microstructure of the N layers thoroughly by using transmission-electron microscopy and XRD. As a comparison, nitriding layers were also prepared by the reactive magnetron sputtering technique. It was found that the nitrogen-enriched ¯lm deposited at 400 ±C by RMS consists of mainly CrN-type nitride and fcc ° phase and a small amount of °N phase, while the PAN treatments at 400 ±C on bulk samples produce only N single-phase layer with gradually changing lattice parameters from the outermost surface to the underlying substrate in the range of 0.393 to 0.355 nm.
Sun, Jian-Da,Chen, Chuang-Zhen,Chen, Jian-Zhou,Li, Dong-Sheng,Chen, Zhi-Jian,Zhou, Ming-Zhen,Li, De-Rui Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
Treatment responses of $N_0$ stage nasopharyngeal carcinoma were firstly analyzed comprehensively to evaluate long term outcomes of patients and identify prognostic factors. A total of 610 patients with $N_0$ NPC, undergoing definitive radiotherapy to their primary lesion and prophylactic radiation to upper neck, were reviewed retrospectively. Concomitant chemotherapy was administrated to 65 out of the 610. Survival rates of the patients were calculated using the Kaplan-Meier method and compared by log-rank test. Prognostic factors were identified by the Cox regression model. The study revealed the 5-year and 10-year overall, disease-free, disease-specific, local failure-free, regional failure-free, locoregional failure-free and distant metastasis-free survival rates to be 78.7% and 66.8%, 68.8% and 55.8%, 79.9% and 70.4%, 81.2% and 72.5%, 95.8% and 91.8%, 78.3% and 68.5%, 88.5% and 85.5%, respectively. There were 192 patients experiencing failure (31.5%) after radiotherapy or chemoradiotherapy. Of these, local recurrence, regional relapse and distant metastases as the first event of failure occurred in 100 (100/610, 16.4%), 15(15/610, 2.5%) and 52 (52/610, 8.5%), respectively. Multivariate analysis showed that T stage was the only independent prognostic factor for patients with $N_0$ NPC (P=0.000). Late T stage (P=0.000), male (P=0.039) and anemia (P=0.007) were independently unfavorable factors predicting disease-free survival. After treatment, satisfactory outcome wasgenerally achieved in patients with $N_0$ NPC. Local recurrence represented the predominant mode of treatment failure, while T stage was the only independent prognostic factor for overall survival. Late T stage, male gender, and anemia independently predicted lower possibility of the disease-free survival.
영상의 클러스터 수 결정과 변형된 퍼지 c - Means 클러스터링을 이용한 영역분할
윤후병(Hoo-Byong Yun),정성종(Seong-Jong Chuang),안동언(Dong-Un An) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1B
영상에 존재하는 객체들을 인식하기 우해서는 먼저 영상의 영역분할이 필요하다. 통계적 모델을 이용한 영상의 영역분할은 미리서 분할하고자 하는 클러스터의 수를 결정한 후 이를 토대로 영상을 분할하게 된다. 그러나 영상마다 특성상 분할하고자 하는 클러스터 수가 다를 경우 이를 수동적으로 해주는 것은 비능률적이다. 따라서 본 논문은 영상의 영역분할에 통계적 모델에서 미리 결정해줘야 하는 클러스터의 수 문제를 자동으로 검출하고 퍼지 c-Means 클러스터링 알고리즘을 통한 영상의 영역분할 시 노이즈 문제를 이웃한 픽셀들의 멤버쉽 값을 평균화함으로써 해결하는 방법을 제안하였다.
Mechanical and optical properties of composite TiOxNy films prepared by pulsed bias arc ion plating
Min Zhang,Guoqiang Lin,김광호,Chuang Dong 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Composite TiOxNy films were synthesized with pulsed bias arc ion plating from two Ti target evaporators in a gaseous mixture of Ar, N2 and O2. With the substrate bias varying from 0 to -700 V, the structural, compositional, mechanical and optical properties of the films were characterized with X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), wear tests and UV–VIS absorption spectra. XRD and XPS results show that deposited at a substrate bias of -100 V, the film crystallized in a mixture of Anatase and Rutile TiO2 phases with O locations partly substituted by N atoms. The threshold wavelength of optical absorption shifts from 367 to 400 nm after N doped, which is related with band gap narrowing cased by N doping. The wear tests indicate that friction efficient first decreases, then increases as the substrate bias goes up. The films deposited at a bias of -300 V exhibit the lowest friction efficient, less than 0.15. For the films on steel substrates, the TiOxNy films deposited at -300 and -500 V exhibit the highest adhesion strength and nano-hardness, respectively.
WeiMing Wang,Shuai Peng,XinTian Chen,YingMing Chen,Chuang Peng,Dong Zeng,Jun Xiong,Hao Liu,XiXian Yang,Ming Li 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
In view of the important industrial application value of alumina supports in the field of oil refining andreforming, it is of great significance to develop a simple and economical synthesis method for the hierarchicalporous alumina. Herein, the hollow microsphere alumina was hydrothermally synthesized withouttemplate. The surface of the hollow microsphere alumina supports has a raised fluffy structure, themicrosphere diameter is about 5 8 lm, and the thickness of the shell is about 1 lm. The morphologyevolution process from solid microspheres to core–shell microspheres with spindle-shaped nanoclusters,and then to hollow fluffy microspheres with protruding surface was observed by investigating the effectof hydrothermal synthesis temperature on the morphology of microspheres. Because of its specific morphologyand surface characteristics, the microsphere can better disperse the active component KW toprepare KW/Al2O3 catalyst and used in the thiolation to methyl mercaptan. Compared with our previouslyused catalysts prepared from commercial alumina, this KW/Al2O3 catalyst was not only able togreatly reduce the amount of active component, but also exhibited higher CH3SH selectivity. On the10KW/Al catalyst, the CH3SH selectivity reached 66.2 % at 340 C, which was about 10 % higher than thatof the previous commercial alumina catalyst. This work can provide theoretical basis and practical guidancefor the reasonable design of new alumina support and high efficiency methyl mercaptan catalyst.
( Zhi-ke Liu ),( Qiu-yu Zhang ),( Ning-ning Yang ),( Ming-guo Xu ),( Jin-feng Xu ),( Ming-long Jing ),( Wen-xing Wu ),( Ya-dong Lu ),( Feng Shi ),( Chuang-fu Chen ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.3
Salmonellosis is a highly contagious bacterial disease that threatens both human and poultry health. Tests that can detect Salmonella in the field are urgently required to facilitate disease control and for epidemiological investigations. Here, we combined loop-mediated isothermal amplification (LAMP) with a chromatographic lateral flow dipstick (LFD) to rapidly and accurately detect Salmonella. LAMP primers were designed to target the Salmonella invA gene. LAMP conditions were optimized by adjusting the ratio of inner to outer primers, MgSO<sub>4</sub> concentration, dNTP mix concentration, amplification temperature, and amplification time. We evaluated the specificity of our novel LAMP-LFD method using six Salmonella species and six related non-Salmonella strains. All six of the Salmonella strains, but none of the non-Salmonella strains, were amplified. LAMP-LFD was sensitive enough to detect concentrations of Salmonella enterica subsp. enterica serovar Pullorum genomic DNA as low as 89 fg/μl, which is 1,000 times more sensitive than conventional PCR. When artificially contaminated feed samples were analyzed, LAMP-LFD was also more sensitive than PCR. Finally, LAMP-LFD gave no false positives across 350 chicken anal swabs. Therefore, our novel LAMP-LFD assay was highly sensitive, specific, convenient, and fast, making it a valuable tool for the early diagnosis and monitoring of Salmonella infection in chickens.