http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유정근,전재범,강기석,정연식 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.2
Recently, investigation of Si-based anode materials forrechargeable battery applications garnered much interest dueto its exceptionally high capacity. High-capacity Si anode(~4,200 mAhg−1) is highly desirable for the replacement ofconventional graphite anode (< 400 mAhg−1) for large-scaleenergy-storage applications such as in electric vehicles (EVs)and energy storage systems (ESSs) for renewable energysources. However, Si-based anodes suffer from poor cyclingstability due to their large volumetric changes during repeatedLi insertion. Therefore, development of highly efficient bindermaterials that can suppress the volume change of Si is one ofthe most essential parts of improving the performance of batteries. We herein demonstrate highly cross-linked polymeric binder(glyoxalated polyacrylamide) with an enhanced mechanical property by applying wet-strengthening chemistry used in paperindustry. We found that the degree of cross-linking can be systematically adjusted by controlling the acidity of the slurry and hasa profound effect on the cell performance using Si anode. The enhanced cycle performance of Si nanoparticles obtained bytreating the binder at pH 4 can be explained by its strong interaction between the binder and Si surface and current collector, andalso rigidity of binder by cross-linking.
유정근,최승훈,김학수,박해경,이철태 ( Jeong Kun Yoo,Seung Hoon Choi,Hak Soo Kim,Hea Kyung Park,Chul Tae Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.3
본 연구는 섬아연광에 대한 NH₄Cl을 염소화제로 사용하는 염소화 반응에 의해 아연을 생산할 수 있는 새로운 공정의 가능성을 타진하기 위해 진행되었다. 이 염소화 반응은 질소 기류 중에서 여러 반응변수를 달리하며 batch system에서 진행되었다. 그 결과 적절한 염소화 조건은 반응온도 375℃, 반응시간 1.5시간, 염화암모늄의 무게비 8.0 그리고 섬아연광의 입도는 -200mesh였다. 이 조건에서 얻어진 염소화 생성물을 물로서 침출한 결과 섬아연광 중의 아연 성분의 97.5%가 추출되었다. This study was carried out to investigate a feasibility of Zn production by the chlorination of sphalerite ore with ammonium chloride as a chlorination agent. This chlorination was proceeded in a batch system of N₂ atmosphere changing the various reaction parameters. The results suggested that the reaction temperature of 375℃, the reaction time of 1.5hr, the ammonium chloride-sphalerite weight ratio of 8, and the sphalerite particle size of -200mesh were the appropriate chlorination conditions. Water leaching of the chlorinated product obtained under this condition, yield 97.5% recovery of zinc.
유정근,최승훈,김학수,박해경,이철태 ( Jeong Kun Yoo,Seung Hoon Choi,Hak Soo Kim,Hea Kyung Park,Chul Tae Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.2
Zn함유 황화광으로부터 Zn제련을 위한 새로운 공정개발의 기초자료를 얻고자 ZnS와 NH₄Cl의 반응을 조사하였다. 이 반응에서 ZnS는 물에 쉽게 녹을 수 있는 염의 형태인 ZnCl2 또는 (NH₄)_nZnCl_(n+2)의 형태로 염소화되었다. 이 염소화의 적절한 반응조건은 반응온도 375℃, 반응시간 2시간, NH₄Cl의 몰비는 16이었다. 위 조건하에서 ZnS의 염소화 전환율이 98.3%이었고, NH₄Cl은 좋은 염소원으로 작용하였다. The reaction between ZnS and NH₄Cl was investiganted in order to get a fundamental data for developing a new Zn-production process from a Zn-bearing sulfide ore. Through this reaction ZnS was chlorinated and converted to the water-soluble-salt form of (NH₄)_nZnCl_(n+2) or ZnCl₂. The results suggested that under N₂ gas atmosphere the reaction temperature of 375℃, the reaction time of 2hrs and the NH₃Cl-to-ZnS mole ratio of 16 were the proper conditions of ZnS. Under the above conditions 98.3% of ZnS was chlorinated and converted, and NH₄Cl was found to act as a good chlorinating agent in this chlorination.
유정근 대한영상의학회 1985 대한영상의학회지 Vol.21 No.5
Bronchiectasis means a permanent abnormal dilatiation of one or more large bronchi owing to destruction of the elastic and muscular components of the bronchial wall. Radiological study is the most important and mandatory procedure. Especially bronchography is essential for the definitive diagnosis of bronchiectasis and for the precise delineation of the type and extent of the disease. The radiological and clinical findings of 48 cases of bronchiectasis diagnosed by bronchography and treated at Chosun University Hospital during the 5 years from January 1980 to December 1984 were analyzed retrospectively. The results were as follows; 1. Among the 48 cases, 34 cases(70.8%) were male and 14 cases(29.2%) were female. Peak incidence was in second decade. 2. Chronic cough, productive squtum and hemoptysis are main symptoms and others are chest pain, dyspnea and recurrent bout of pneumonia. The most common physical sign is persistent moist rales over the involved area in 23 cases(47.9 ). Others are no sign in 17 cases(35.4%), wheezing in 11 cases(22.9%) and digit clubbing in 3 cases(6.3%). 3. The presumed causes were composed of not known in 30 cases(62.5%) and complications of measles in 7 cases(14.6%), pertussis in 5 cases(10.4%) and pneumonia in 4 cases(8.3%). Two cases were Kartagener's syndrome and unilateral hyperlucent lung. 4. Plain chest roentgenographic findings were abnormal in 42 cases(87.5%) but normal in 6 cases(12.5%). The most comon radiological finding was accentuation of lung marking in 36 cases(85.7%), the others are include in order of frequency, pneumonic infiltration, linear radiolucencies, cystic radiolucencies, decreased affected lung volume, air-fluid level and pleural thickening. 5. Bilateral bronchiectasis was demonstrated in 11 cases(22.9%) and the disease was much more often involved left lung than right. The most commonly involved lobe is left lower lobe, and the most common site of involvement was the posterior basal segment of the l wer lobe. The type of bronchiectasis is cylindrical in 22 cases(45.8%), varicose in 11 cases(22.9%), saccular in 9 cases(18.8%) and mixed type in 6 cases(12.5%).
Silica Aerogel과 펄프 복합체의 기계적 특성에 관한 연구
유정근,김학희,김학수,최창하 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.3
본 연구는 실리카 에어로겔-펄프 복합체의 특성을 조사하였다. Paste 형태의 실리카 에어로겔과 펄프를 혼합하여 복합체를 제조하였으며, SEM 분석을 실시하였다. 또한 임피던스 튜브를 사용하여 흡음률을 측정하였다. 흡음계수의 피크치는 900 Hz 범위에서 얻어졌다. 실리카 에어로겔-펄프 혼합체는 우수한 흡음성능과 복합체의 표면이 소수성을 띠기 때문에 기인하는 내구성 때문에 새로운 흡음제의 가능성이 있다고 사료된다. The studies on the characteristics of composite of silica aerogel and pulps were carried out. The compositewas manufactured by mixing the paste of silica aerogel and pulps and analyzed by SEM. Using the impedence tube, thesound absorption measurement was investigated. The maximum value of sound absorption coefficient of this compositewas obtained in the range of 900 Hz. It was found that the composite of silica aerogel and pulps could be a new soundabsorbent because of high absorption capacity and durability which was due to hydrophobic effect on the surface of thecomposite.