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Vinyl monomer에 의한 SIS block copolymer의 改質과 그 特性
왕은진,윤정식,유종선,백남철 慶熙大學校 材料科學技術硏究所 1991 材料科學技術硏究論集 Vol.4 No.-
The graft polymerization of 2-Hydroxyethylmethacrylate (HEMA) and Vinyltriethoxysilane (VTES) onto Styrene-isoprene-styrene block copolymer (SIS) was carried out in toluene, with radical initiators such as benzoyl peroxide(BPO) and α, α`-Azobisisobutyronitrile(AIBN) under nitrogen atmosphere. The degree of grafting was increased with the increases of the reaction temperature and reaction time. The efficiency of BPO was superior to that of AIBN. The mechanical properties and molecular weight of graft products were measured and the applicability as a adhesive of plasticized PVC leather was examined. The hardness and the molecular weight of graft products was increased with the increases of the degree of grafting, but elongation at break was decreased with the increases of one. And the tensile strength was maximum at the degree of grafting of about 6.5%. It was found that a toluene solution of graft products was confirmed to be an effective hot melt adhesive for the bond of plasticized PVC leather.
정종헌,원휘준,최왕규,김계남,이성호,오원진 한국공업화학회 2003 응용화학 Vol.7 No.1
Liquid wastes containing uranium ions in high concentration of chemical salts havebeen treated by electrosorption on a activated carbon fibers(ACFs) electrode. Effectiveuranium (VI) removal is accomplished when the potential is -0.5V(vs. Ag/AgCl) ormore negative. For a feed concentration of 100mg/1, the concentration of U(VI) in thecell effluent is reduced to less than 1mg/1, and electrosorption capacity over 500mg/uranium/gACF is reached. The adsorbed uranium can be desorbed up to 99%for 20h by passing a 1.9N NaCl solution at pH 3 through the cell and applying a potential of +1.2V. The amount of desorbed uranium increased as the solution pHwas lowered and the applied potential increased.
전력선모뎀 및 조광제어 안정기를 이용한 400W Metal Halide Lamp의 조광제어 시스템 개발
박종연,최왕섭 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.B
In this paper, we developed remote dimming control system of electronic ballast for 400W metal halide lamp. This ballast could limit ignition current and soft start-up technique by the inverter with LCsCp resonance tank. The dimming circuit can dim from 400W to 200W by varying of the inverter switching frequency. The PLM consists of coupling circuit, BPF(Band-Pass Filter), FSK(Frequency Shift Keying) Modem and μ-controller(Micro Controller). By coupling electronic ballast with PLM, the system that able to dimming the lamp through PLM is demonstrated by experimental results.
박종연,최왕섭 江原大學校 産業技術硏究所 2010 産業技術硏究 Vol.30 No.A
We described the operating principles of two different type of igniters for lightning of Ceramic Metal Halide Lamp(CMHL) and also provide some useful comparisons. One is for magnetic ballast, the other one is for electronic ballast which operates lamp by low-frequency square-waveform. Ignition voltage of lamp depends on the structure of igniter, such as the length and electrical characteristics of cable, which make troubles for ignition in real sites. Therefore, we measured and analyzed ignition voltages from igniters which are used in magnetic and electronic ballast in cables at a distance of 5 meters between a lamp and a igniter to suggests an applicable solution in real sites.
표재성 방광암에서 Bacillus Calmette-Guerin 방광 내 주입요법 : 장기적 추적결과 Long-term Follow up Results
김용웅,왕세환,육승모,한동석,노안식,나용길,설종구 충남대학교 의학연구소 2003 충남의대잡지 Vol.30 No.2
To evaluated the results of long-term follow up of superficial bladder cancer patients who were treated with transurethral resection and intravesical BCG therapy. Between April 1989 and December 1997, 65 patients with superficial bladder cancer were treated with TUR-B(Transurethral resection of bladder tumor) and intravesical BCG instillation, and follow-up was performed for 5 years longer, and the mean follow-up duration was 82 months. Of 65 patients, pathologic stage were Ta in 17 cases and T1 in 48 cases and grade were G Ⅰ in 22 cases, G Ⅱ in 35 cases and G Ⅲ in 8 cases. The tumor recurred in 22(33.8%) at the median of 21.8 months and the tumor progressed in 9(13.8%) at the median of 20.8 months. Most of the recurrences and progression were within 3 year(838 and 77%). Progression is more likely in higher grade(G Ⅱ, G Ⅲ) and higher stage(T1). The complete response rate after first and second courses of BCG therapy were 53% and 73% and the 5 and 10 year disease specific survival rates were 89.5 and 78% respectively. The complete response rate after first and second courses of BCG therapywere 53% and 73%. Most of recurrences and progressions were within 3 years of the BCG therapy, but some cases occured after 5 years. Therefore, close long-term follow up is needed.
고립성 폐결절의 조직학적 진단에 있어서 경기관지폐생검의 진단적 가치
김치훈,김정주,왕준호,연규민,김형수,리원연,용석중,신계철 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-
Transbronchial lung biopsy(TBLB) is a relatively simple and convenient diagnostic tool in solitary pulmonary nodule(SPN) on chest radiograph, which is cannot be diagnosed through routine tests. To investigate the diagnostic value and diagnostic rate of TBLB according to the variable factor, we analyzed 69 patients with radiologically SPN lesion on chest radiograph which was confirmed histologically. A histologic diagnosis of TBLB was made in 47 of 69 patients(68.1%), in which 26 of 37(70.3%) with malignancy and 21 of 32(65.6%) with benign lesion. There were no significant differences in diagnostic yield according to age, sex and location of the lesion. The diagnostic rate tended to increase with the more than 5 pieces to acquired by TBLB. When the size of SPN was less than 3 ㎝, it cannot be diagnosed. In conclusion, TBLB is a diagnostic procedure with good yield and safety, but percutaneous needle aspiration, transbronchial needle aspiration, and bronchial washing fluid cytology may be a complementary procedure to overcome the limitation of TBLB and get higher diagnostic yield for SPN.
전압제어 GIC를 이용한 대역 및 고역통과 필터의 특성 비교
송명석,노경호,김왕식,박종연 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-
In this paper, we have presented comparative characteristics of band-pass filter and high-pass filter using VCGIC(Voltage Controlled Genenalized Impedance Converter), which are the non-linearized VCR(Voltage Controlled Resistance) and the linearized VCR. We concluded that the linearized VCGIC circuit has the wide dynamic range and the improved linearity.
Effects of Ohmic Area Etching on Buffer Breakdown Voltage of AlGaN/GaN HEMT
Chong Wang,Xiao-Xiao Wel,Meng-Di Zhao,Yun-Long He,Xue-Feng Zheng,Wei Mao,Xiao-Hua Ma,Jin-Cheng Zhang,Yue Hao 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
This study is on how ohmic area etching affects the buffer breakdown voltage of AlGaN/GaN HEMT. The surfacemorphology of the ohmic metal can be improved by whole etching on the ohmic area. The buffer breakdown voltagesof the samples with whole etching on the ohmic area were improved by the suppression of the metal spikes formedunder the ohmic contact regions during high-temperature annealing. The samples with selective etching on theohmic area were investigated for comparison. In addition, the buffer leakage currents were measured on the differentradii of the wafer, and the uniformity of the buffer leakage currents on the wafer were investigated by PL mappingmeasurement.
Chong Wang,Wendi Qu,Chi Yeol Kim 한국항해항만학회 2021 한국항해항만학회지 Vol.45 No.5
Given the cyclicality, seasonality, and capital-intensiveness, the development of the shipping industry has long been contingent on corporate financing activities. As such, there have been a growing number of cities in East Asia pursuing a global maritime financial center in order to support their domestic shipping industry. However, it is widely accepted that financial services relevant to shipping in East Asia are quite under-developed compared to those of other leading maritime financial centers in Europe and North America. In this regard, this paper aimed to construct an evaluation index of maritime financial centers in terms of financial ecological environment for the purpose of highlighting the current status of development and suggesting future directions. Furthermore, this paper examined the development of shipping finance in Qingdao as a numerical example using the fuzzy comprehensive evaluation and compared results with those of Shanghai.