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李鳳求,金相根,李晩徽,金武剛 충남대학교 수의과대학 동물의과학연구소 1995 動物醫科學硏究誌 Vol.3 No.-
The study was carried out to investigate the charges of hourly and daily components and preservation of colostrum produced 1st through 7th day after parturition of Holstein cows. The results obtained were summarized as follows : 1. The specific gravity in colostrum was 1.032-1.057 from 1 to 24 hrs after parturition and then showed slightly higher than normal milk. The pH and titerable acidity were 6.43 and 0.170% at 1 hrs after parturition respectively and thereater gradually increased. 2. The solids not-fat, fat and protein of colostrum were 16.24%, 6.60% and 14.20% at 1hrs after parturition respectively, and then showed markedly higher than normal milk. 3. The solids not-fat, fat and protein of colostrum were 9.02%, 6.66% and 3.92% at day 1 postpartum respectively and thereafter gradually decreased. But milk lactose ranged from 2.47% to 4.76% at day 1-7 postpartum and thereafter gradually increased. 4. The F, Mg and Fe of colostrum were 0.244%, 0.064% and 0.430% at day 1 postpartum respectively. The Ca and Na were 0.262% and 0.074% at day 1 postpartum and then showed markedly higher than normal milk and thereafter gradually decreased. 5. The pH from 1st through 5th days of milking was decreased from 6.4 to 5.3. The number of common bacteria reached a peak levels of 1×10^7.5/ml after 3-7 days and then slightly decreased. The number of coli from group reached a peak levels of 1×10^8/ml after 3 days and thereafter rapidly decreased to 10^3/ml after 20 days. 6. The number of common bacteria of colostrum added 0.5, 1.0 and 2.0% of propionic acid and acetic acid at 20℃ were inhibited from 1 to 20 days in addition of 0.5%-2% propionic acid and acetic acid. The number of coli form group was retarded from 3 to 7 days addition of 1.0%-2.0% propionic acid and acetic acid. The addition of propionic acid and acetic acid to colostrum were effective in retarding the growth of bacteria than acetic acid.
Sc₂O₃를 첨가한 SnO₂/Ca,Pt 가스센서의 부탄감응 특성
이윤수,성정훈,강봉휘,서무교,이덕동 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
A coprecipitation method was used for preparing Ca and Pt doped SnO_(2) powder. Components were investigated by XRD and SEM. Sc_(2)O_(3) added SnO_(2) /Ca,Pt thick film devices were fabricated by screen printing technique for butane gas detecting. By addition of Sc_(2)O_(3), the selectivity of SnO_(2) /Ca,Pt thick film for butane gas was enhanced. The sensitivity of Sc_(2)O_(3) added SnO_(2) /Ca,Pt device to 3,000 ppm butane in air was about 90% at the operating temperature. of 200℃. And the device showed good selectivity for butane gas.
채유석,송갑득,강봉휘,서무교,이덕동 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The simple solid electrolyte carbon dioxide sensor was fabricated using Li ionic conductor with a heater and Li_(2)CO_(3)+Na_(2)CO_(3)+K_(2)CO_(3) (47.6 : 25.4 : 27.0) as a metal carbonate auxiliary phase. The electromotive force(EMF) was in excellent agreement with the EMF value calculated from the Nernst' s equation for CO_(2) gas concentration from 950 to 9,950ppm at 420℃, with the response time of 15~25 sec.. Water vapor hardly affected the sensor characteristics for relative humidity from 40% to 90%, in contrast to the case of the Li_(2)CO_(3) and Na_(2)CO_(3) + BaCO_(3)(1 : 1.7). The CO_(2) sensitivity of this sensor was stable for the test period of 240 hours.
최낙진,류정호,강봉휘,이광우,이덕동 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The semiconductor gas sensors with a tin oxide as the raw material have been generally used to detect gases in the principle of electrical conductivity variation. However, it was difficult to design the gas detection system due to the non-selectivity, the non-stability and the influence of temperature, humidity etc. Therefore, it was proposed NDIR(non-dispersive infrared) method using pyroelectric infrared sensor to overcome the disadvantage of the semiconductor gas sensors. This method has been recently used to detect various gases in industrial parts. It has the advantages of selectivity, stability and responsibility. The gases used in this paper were CO_(2)(carbon dioxide) and HC(hydrocarbon) series. The system was designed with the Intel MCU i8097BH microprocessor. Main topics were to remove interference effect for other gases and to minimize influence for ambient circumstance by using the software and the hardware techniques.
장경훈,임준우,강봉휘,이덕동 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Low power consuming butane gas sensors were fabricated using mica substrate which is a thin and elastic insulator. To increase the sensitivity and the stability, various catalyst layers were formed on SnO_(2) thin layer. Among them, SnO_(2) /Pt(17Å)/Pd(30Å) and SnO_(2) /Pt(8Å )/Pd(30Å) thin layer showed good characteristics in stability and dependance of temperature and humidity. The size of fabricated sensors was 1 x 3 mm^(2) and the consumed power was lower than 100 mW at operating temperature(250℃). For 2000 ppm butane concentration, the response time and the recovery time were about 5 seconds and 15 seconds respectively. The sensitivity of the sensors was about 80 % for 5000 ppm butane concentration.
실리콘의 TMAH 식각을 사용한 Suspended-type 마이크로 가스센서의 제조
김현호,이상문,임준우,강봉휘,정완영,이덕동 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
In recent years, different types of microfabricated 'suspended-type' structure have been used as freestanding membranes for a variety of micro gas sensors. We examined the silicon etching characteristics of tetramethyl ammonium hydroxide(TMAH). A suspended type micro gas sensor with platinum heater, sensing electrode and temperature sensor using TMAH etching of silicon was fabricated on silicon nitride(1,500Å)/ silicon dioxide (3,000Å)/ silicon nitride(1,500Å) dielectric membrane. It has low thermal conductivity and balanced stress with silicon substrate for the purpose of improving the thermal isolation between heater and silicon substrate. To avoid any chemical or physical damages to gas sensing material during the photolithography or shadow mask process, the tin dioxide film was deposited onto whole surface of device by using maskless electron beam(e-beam) evaporation technology. The power consumption of the fabricated device was about 40mW at the operating temperature of 250°C. In case of adding Pt(2wt.%) or Pd(2wt.%) catalyst, the sensitivity to CO was higher and the sensitivity to C_(4)H_(10) was higher than those to other gases, respectively.
화학 및 생물센서 : SnO2 열산화감지막의 제작 및 특성
강봉휘 ( Bong Hwi Kang ),이덕동 ( Duk Dong Lee ) 한국센서학회 2002 센서학회지 Vol.11 No.6
New formation technique of metal of oxide sensing film was proposed in this paper. Silicon wafer with Pt electrodes was used as a substrate for depositing metal Sn film. Metal Sn was deposited in the state of not continuous film but only island state. The samples were prepared to obtain the optimal condition of metal Sn deposition. The resistances of deposited Sn onto Pt electrodes amounted to 1 kΩ, 5 kΩ, 10 kΩ and 50 kΩ, respectively. Also The sample with 1,500 Å thickness of Sn was prepared in order to compare sensing properties between conventional type and proposing type. After deposition of metal Sn, SnO_2 was formed by thermal oxidation method for 3 hrs. in O_2 ambient at 700℃. Surface morphology, crystal structure and surface roughness of oxidized-sensing film were examined by SEM, XRD, and AFM, respectively. From the results of these analyses, the optimal deposition condition of Sn was that the Pt electrode resistance became 10 kΩ (300 Å). Also, the sensing characteristics of fabricated sensing film for various concentrations of butane, propane and carbon monoxide gases were measured at the operating temperatures of 250 ℃, 300 ℃ and 350 ℃, respectively. Although catalyst was not added to the sensing film, it has exhibited the high sensitivity to all the test gases.
강봉휘,이덕동,임준우,장경훈 경북대학교 전자기술연구소 1996 電子技術硏究誌 Vol.17 No.1
Low power consuming butane gas sensors were fabricated using mica substrate which is a thin and elastic insulator. To increase the sensitivity and the stability, various catalyst layers were formed on SnO₂ thin layer. Among them, SnO₂/Pt(17Å)/Pd(30Å) and SnO₂/Pt(8Å)/Pd(30Å) thin layer showed good characteristics in stability and dependence of temperature and humidity. The size of fabricated sensors was 1×3 ㎟ and the consumed power was lower than 100 ㎽ at operating temperature(250℃). For 2,000 ppm butane concentration, the response time and the recovery time was about 5 seconds and 15 seconds respectively. The sensitivity of the sensors was about 80% for 5,000 ppm butane concentration.