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4-N,N-Dimethylamino-4'-N'- Mothy1-stilbazolium tosylate의 수화물
홍형기,윤춘섭,서일환,이진호,최성산,오미란,Hong Hyung-Ki,Yoon Choon Sup,Suh Il-Hwan,Lee Jin-Ho,Choi Sung-San,Oh Mi-Ran,Marder Seth R. Korea Crystallographic Association 1997 韓國結晶學會誌 Vol.8 No.1
표제화합물의 결정구조는 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium, $C_{16}H_{19}N_2$와 tosylate, $C_7H_7SO_3$의 불연속한 이분자체로 구성되어 있다. 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium 분자는 중간에 있는 C=C double bond에서 trans conformation을 가지고 있으며 phenyl 및 pyridyl ring들간의 이면각은 $5.7(2)^{\circ}$을 이루어 전분자는 $0.138(8){\AA}$ 내에서 평면을 이루고 있다. Tosylate 분자들은 거리가 각각 2.855(9) and $2.899(8){\AA}$인 O-H...O 수소결합으로 연결된 이분자체를 나타내고 있다. 이 두 분자간의 가장 가까운 거리는 O(3)와 C(16) 원자간의 $3.10(1){\AA}$이다. The crystal structure of the title compound consists of discrete 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium, $C_{16}H_{19}N_2$, and tosylate, $C_7H_7SO_3$, dimer. The 4-N,N-dimethylamino-4'-N'-methyl-stilbazolium molecule has a trans conformation at the central C=C double bond: the dihedral angle between the phenyl and the pyridyl rings is $5.7(2)^{\circ}$ and the whole molecule is planar within $0.138(8){\AA}$. Tosylate molecules display hydrogen-bonded dimers with the O-H...O distances of 2.855(9) and $2.899(8){\AA}$, respectively. The shortest intermolecular contact is the distance $3.10(1){\AA}$ between O(3) and C(16).
CO/HC 가스 인식을 위한 소형 전자코 시스템의 제작 및 특성
홍형기,권철한,윤동현,김승렬,이규정,김인수,성영권 ( Hyung Ki Hong,Chul Han Kwon,Dong Hyun Yun,Seung Ryeol Kim,Kyu Chung Lee,In Soo Kim,Yung Kwon Sung ) 한국센서학회 1997 센서학회지 Vol.6 No.6
system has been fabricated and characterized using an oxide semiconductor gas sensor array and pattern recognition techniques such as principal component analysis and back-propagation artificial neural network. The sensor array consists of six thick-film gas sensors whose sensing layers are Pd-doped WO₃, Pt-doped SnO₂, TiO₂-Sb₂O_5$gt;-Pd-doped SnO₂, TiO₂-Sb₂O_5-Pd-doped SnO₂ Pd coated layer, Al₂O₃-doped ZnO and PdCl₂-doped SnO₂. The portable electronic nose system consists of an l6bit Intel 80c196kc as CPU, an EPROM for storing system main program, an EEPROM for containing optimized connection weights of artificial neural network, an LCD for displaying gas concentrations. As an application the system has been used to identify 26 carbon monoxide/hydrocarbon (CO/HC) car exhausting gases in the concentration range of CO 0%/HC 0 ppm to CO 7.6%/HC 400 ppm and the identification has been successfully demonstrated.
윤동현,권철한,홍형기,김승렬,이규정 ( Dong Hyun Yun,Chul Han Kwon,Hyung Ki Hong,Seung Ryeol Kim,Kyu Chung Lee ) 한국센서학회 1997 센서학회지 Vol.6 No.6
An ammonia gas sensor with high sensitivity using thick-film technology were fabricated and examined. The material for sensing the ammonia gas was the mixture of oxide semiconductor, FeO_x-WO₃-SnO₂. The sensor exhibits resistance increase upon exposure to low concentration of ammonia gas. The resistance of the sensor is decreased, on the other hand, for exposure to reducing gases such as ethyl alcohol, methane, propane and carbon monoxide. A novel method for detecting ammonia gas quite selectively utilizing a sensor array consisting of an ammonia gas sensor and a compensation element were proposed and developed. The compensation element is a Pt-doped WO₃-SnO₂ gas sensor which shows opposite direction of resistance change in comparison with that of the ammonia gas sensor upon exposure to ammonia gas. Excellent selectivity has been achieved using the sensor array having two sensing elements.
김승렬,운동현,홍형기,권철한,이규정 ( Seung Ryeol Kim,Dong Hyun Yun,Hyung Ki Hong,Chul Han Kwon,Kyu Chung Lee ) 한국센서학회 1997 센서학회지 Vol.6 No.6
The thick films of oxide semiconductors such as WO₃, SnO₂ and ZnO for the NO₂ detection of sub-ppm range have been prepared and their characteristics were investigated. It is showed that the optimum operating temperatures of the sensors are 300℃ and 220∼260℃ for WO₃-based and SnO₂-based thick films, and ZnO-based thick films, respectively. Since the resistance of ZnO-based thick films are extremely high($gt;l0^6Ω), the signal to noise ratio was comparatively low. In order to determine the selectivity, the films are exposed to the interfering gases such as ozone, ammonia, methane and the mixture of carbon monoxide and propane. WO₃-ZnO(3 wt.%) and SnO₂-WO₃(3 wt.%) thick film sensors show high sensitivity, good selectivity, excellent reproducibility and the linearity of NO₂ concentration versus sensor resistance. The preliminary results clearly demonstrated that the sensor can be successfully applied for the detection of NO₂ in sub-ppm range.
강석현(Seok Hyon Kang),홍형기(Hyung Ki Hong) 한국안광학회 2014 한국안광학회지 Vol.19 No.3
This is a comparative experimental study on the amount of phoria by the removal time of binocular fusion. In this study, three tests were used for phoria test like Howell test, Thorington test and developed 3D polarizing test. Methods: In this study, it was considered the removal time of binocular fusion for measuring phoria. The three methods were used for measuring quantity of phoria: Howell test, Thorington test and developed 3D Polarizing test. The measurements progressed quickly to avoid eye-strain. So we designed the test charts for marking 3D display modules and the apparatus inserted lenses, like Maddox lens and prism, which are compatible with three phoria tests. The phoria at the moment separation was measured when the binocular fusion was broken through the apparatus and the that at the stable separation was measured when activity of the separated two images like indicated box and figure on horizontal axis stopped. Results: There were statistically significant difference between quantity of phoria at moment separation and that at stable separation. Amount of phoria at moment separation was relatively larger than amount of that at stable separation. In result in exophoria, the quantity of phoria at moment separation was higher than that at stable separation, and in phoria measured by developed 3D polarizing test, it shows the similar results at two condition. Conclusions: For exophoria, the amount of phoria at moment separation of binocular fusion was relatively larger than that at stable separation. The amount of difference between phoria values at moment separation and that at stable separation was alike among three phoria tests. Usually in working, there is no distinction between moment separation and stable separation. But there were definitely the difference between two ways to separate binocular fusion. Therefore, it is need for writing on prescription test name for measuring phoria and condition of separation of binocular fusion.
자동 굴절력계의 굴절력값과 포롭터를 이용한 처방값의 차이에 관한 연구
이주환(Ju Whan Lee),이규석(Koo Seok Lee),홍형기(Hyung Ki Hong) 한국안광학회 2014 한국안광학회지 Vol.19 No.2
Purpose: This study is research of the conditions which causes difference between the refractive power of the measurement of autorefractometer and the prescription using phoropter. Methods: Autorefractometer (SR-7000) and phoroptor (AV-9000) were used to measure 60 eyes of 30 participants who had no eye diseases and wore the corrective lens due to Ametropia. To prevent the dependence of the prescription value of the refractive power on the testers, two testers measured the refractive power of the eyes of the participants at the same measuring conditions. Results: Statistically, the prescribed values of the refractive power by two testers were not significantly different. Most of the prescribed values of the refractive power were smaller than the refractive power by autorefractometer In case of myopic eyes, the difference between refractive powers by the measurement of autorefractometer and the prescription using phoropter showed the trend of increase as the spherical refractive power became larger. The result was analyzed by the range of the different cylindrical refractive power for the myopic astigmatic eyes. In this case, the difference between refractive powers showed the trend of decrease as the cylindrical refractive power became larger. Conclusions: No difference between the prescribed value by two testers was observed. In case of myopic or myopic astigmatic eyes, the difference between refractive powers by autorefractometer and the prescription were measured to be approximately proportional to the refractive powers of ametropic eyes. As the this difference become larger for the participant who needs the lens of larger refractive power, additional caution is needed in the prescription of the refractive power of the corrective lens.