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이희범,Lee, Hui-Beom 한국광산업진흥회 2001 광산업정보 Vol.6 No.-
정부는 광산업을 국가전략산업으로 광프로젝트를 추진하고 있다. 21세기 대표산업으로 광산업이 꽃 피우기 위해서는 중앙부처와 지방자치단체가 합심하여 광주에서 축을 형성, 광산업을 한층 발전시켜나가야 한다. 앞으로 정부는 국내시장을 비롯한 세계시장을 겨냥한 사업선정과 광산업 선진국인 미국,일본 등과의 네트워크 구축, 우수인력 유치와 양성을 통한 첨단기술 확보에 최선을 다할 계획...
기침에 대한 비내시경을 이용한 한열변증(寒熱辨證)의 임상적 가치평가
이희범,박의근,백현정,이범준,정승기,정희재,Lee, Hee-Beom,Park, Eui-Keun,Baek, Hyun-Jung,Lee, Beom-Joon,Jung, Sung-Ki,Jung, Hee-Jae 대한한방내과학회 2014 大韓韓方內科學會誌 Vol.35 No.3
Objectives: This study was aimed to figure out an agreement between the diagnosis of nasal endoscopy and a preexisting questionnaire focusing on Cold-Heat pattern. Methods: 52 patients with cough who met the criteria filled out a pattern questionnaire and the examiner looked at their nasal cavities through nasal endoscopy. According to the checked questionnaire results, the subjects were identified by 6 patterns. After examining subject's mucous membrane of oropharynx and nasal cavity through nasal endoscopy, we classified each to the Cold or Heat group. Correlation between questionnaire and nasal endoscopy results was analyzed. Results: In diagnosing Cold-Heat, there was no significant difference by McNemar test (p=0.227) between nasal endoscopy and the questionnaire, and the two methods agreed moderately (${\kappa}=0.428$). The color of mucous membrane of oropharynx and the Cold-Heat pattern on questionnaire agreed slightly (${\kappa}=0.133$). The color of mucous membrane of nasal cavity and the Cold-Heat pattern on questionnaire agreed fairly (${\kappa}=0.384$). In the patients with cough related to upper respiratory tract, they got higher diagnosis accuracy than the patients with cough related to lower respiratory tract did. Similarly, external cough patients got higher diagnosis accuracy than internal cough patients did. Conclusions: To identify Cold or Heat, examining oropharynx and nasal cavity using nasal endoscopy is a meaningful method in patients with cough, showing that two diagnosis methods which use nasal endoscopy and questionnaire agreed moderately. Especially, it is more useful diagnosing patients with cough related to the upper respiratory tract than diagnosing the patients with cough related to the lower respiratory tract.
Ag 도금 Cu 입자의 제조에서 암모늄 기반 혼합 용매를 사용한 Cu 입자의 전처리 조건과 이의 영향
이희범,이종현,Lee, Hee Bum,Lee, Jong-Hyun 한국재료학회 2016 한국재료학회지 Vol.26 No.3
To achieve the fabrication of high-quality Ag-coated Cu particles through a wet chemical process, we reported herein pretreatment conditions using an ammonium-based mixed solvent for the removal of a $Cu_2O$ layer on Cu particles that were oxidized in air for 1 hr at $200^{\circ}C$ or for 3 days at room temperature. Furthermore, we discussed the results of post-Ag plating with respect to removal level of the oxide layer. X-ray diffraction results revealed that the removal rate of the oxide layer is directly proportional to the concentration of the pretreatment solvent. With the results of Auger electron spectroscopy using oxidized Cu plates, the concentrations required to completely remove 50-nm-thick and 2-nm-thick oxides within 5 min were determined to be X2.5 and X0.13. However, the optimal concentrations in an actual Ag plating process using Cu powder increased to X0.4 and X0.5, respectively, because the oxidation in powder may be accelerated and the complete removal of oxide should be tuned to the thickest oxide layer among all the particles. Back-scattered electron images showed the formation of pure fine Ag particles instead of a uniform and smooth Ag coating in the Ag plating performed after incomplete removal of the oxide layer, indicating that the remaining oxide layer obstructs heterogeneous nucleation and plating by reduced Ag atoms.