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송형근,이상호,계기성,유종만 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.1
The purpose of this study was to investigate the effect of electrical anesthesia induced by transcutaneous electrical nerve stimulation on inhibition of the pain response evoked by noxious electrical stimuli in teeth and gingiva. The experiment was carried out on anesthetized dogs. Left digastric muscle was exposed and wire electrodes were inserted into the muscles to record E.M.G.. Bipolar stimulating electrodes were inserted into the tooth of canine and the palatal area of gingiva. Noxious electrical stimuli were delivered to the tooth and the gingiva by electric stimulator(GrassTM, USA) under electronic anesthesia induced by transcutaneous electrical nerve stimulation device with frequency of 50㎐. The E.M.G. of jaw opening reflex at digastric muscle was measured by the osciloscope and the audiometer connected to amplifier(A-M system, 1700, USA) at different intensity of electronic anesthesia of 1 volt, 4 volt, and 10 volt. The pain threshold and the inhibitory rate of pain via E.M.G. of digastric muscle were analysed statistically with paired t-test adn χ2-test. The obtained results were as follows ; 1. Transcutaneous electrical nerve stimulation with intensity of 1 volt and 4 volt increased the pain threshold 9.4% and 18.6% in teeth and 14.3% and 32.1% in gingiva respectively, but that of 10 volt did not change or reduce the pain threshold. 2. Transcutaneous electrical nerve stimulation with intensity of 1 volt, 4 volt, and 10 volt showed the inhibitory effect of pain of 10.5%, 15.0% and 4.6% in teeth, and 18.2%, 23.4%, and 19.3% in gingiva respectively when noxious electrical stimulation was inserted 1.5 times higher than the pain threshold. Transcutaneous electrical nerve stimulation with intensity of 10 volt did not show inhibitory effect of the pain response as that of 1 volt and 4 volt. 3. The pain threshold in gingiva was increased higher by transcutaneous electrical nerve stimulation than it was in teeth, and the inhibitory effect of the pain in gingiva was also increased higher than it was in teeth. In regard to above results, inhibitory effects of pain induced by transcutaneous electrical nerve stimulation was not so high as to replace the role of drug anesthesia wholly. The technique of reducing pain induced by transcutaneous electrical nerve stimulation itself, was needed to develop to have better anesthetic or analgesic effect and less discomfort during anesthetic procedure.
GENERALIZATIONS OF CERTAIN SUMMATION FORMULA DUE TO RAMANUJAN
Song, Hyeong-Kee,Kim, Yong-Sup The Honam Mathematical Society 2012 호남수학학술지 Vol.34 No.1
Motivated by the extension of classical Dixon's summation theorem for the series $_3F_2$ given by Lavoie, Grondin, Rathie and Arora, the authors aim at deriving four generalized summation formulas, which, upon specializing their parameters, give many summation identities including, especially, the four very interesting summation formulas due to Ramanujan.
Generalizations of Certain Summation Formula Due to Ramanujan
( Hyeong Kee Song ),( Yong Sup Kim ) 호남수학회 2012 호남수학학술지 Vol.34 No.1
Motivated by the extension of classical Dixon`s summa- tion theorem for the series 3F2 given by Lavoie, Grondin, Rathie and Arora, the authors aim at deriving four generalized summa- tion formulas, which, upon specializing their parameters, give many summation identities including, especially, the four very interesting summation formulas due to Ramanujan.
Preliminary Application of the Draft Code Case for Alloy 617 for a High Temperature Component
Hyeong-Yeon Lee,Yong-Wan Kim,Kee-Nam Song 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.5
The ASME draft Code Case for Alloy 617 was developed in the late 1980s for the design of very-high-temperature gas cooled reactors. The draft Code Case was patterned after the ASME Code Section III Subsection NH and was intended to cover Ni-Cr-Co-Mo Alloy 617 to 982°C (1800°F). But the draft Code Case is still in an incomplete status, lacking necessary material properties and design data. In this study, a preliminary evaluation on the creep-fatigue damage for a high temperature hot duct pipe structure has been carried out according to the draft Code Case. The evaluation procedures and results according to the draft Code Case for Alloy 617 material were compared with those of the ASME Subsection NH and RCC-MR for Alloy 800H material. It was shown that many data including material properties, fatigue and creep data should be supplemented for the draft Code Case. However, when the evaluation results on the creep-fatigue damage according to the draft Code Case, ASME-NH and RCC-MR were compared based on the preliminary evaluation, it was shown that the Alloy 617 results from the draft Code Case tended to be more resistant to the creep damage while less resistant to the fatigue damage than those from the ASME-NH and RCC-MR.
초음파-알루미늄 기반의 수소 연료전지 자동차용 수소 누출 검지 센서
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),기성종(Seong-Jong Ki),김현일(Hyun-Il Kim),전인수(In-Su Jeon),기창두(Chang-Doo Kee) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5
We recently developed the ultrasonic-aluminum hydrogen detecting sensor to detect an explosion by hydrogen leakage of a hydrogen fuel cell vehicle. This sensor consists of a piezoelectric transducer which generates ultrasonic wave and aluminum plate coated with palladium and platinum. Ultrasonic wave generated from a piezoelectric transducer is guided and propagated through aluminum plate coated with palladium and platinum. In situation of hydrogen leakage, volume of the palladium layer is expanded because hydrogen molecules were adsorbed in palladium and inflated slightly. Futhermore pressure increase to aluminum plate by expansion of volume causes a loss of ultrasonic wave. In the result of this response, output voltage has decreased and the amplitude has gradually damped by increasing concentration of hydrogen gas. According to this study, developed ultrasonic-aluminum hydrogen detecting sensor is suitable to detect an explosion by hydrogen leakage of a hydrogen fuel cell vehicle.
초음파를 이용한 수소 연료 자동차용 알루미늄 박판 기반 수소 검출 센서
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),전인수(In-Su Jeon),양성모(Sung-Mo Yang),기창두(Chang-Doo Kee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
We have developed an aluminum thin plate based hydrogen sensor to detect hydrogen leakage of a hydrogen fuel cell vehicle using ultrasonic wave. This sensor consists of a piezoelectric sensor which generates and receive ultrasonic wave, and an aluminum plate coated with palladium and platinum. Ultrasonic wave is guided and propagated through aluminum plate coated with palladium and platinum. In situation of hydrogen leakage, the density of the palladium layer is changed because hydrogen molecules were adsorbed and inflated in palladium. Futhermore, the changed density of the palladium layer causes the change of the propagation behavior of the ultrasonic wave. As a result, the amplitute of output voltage corresponding to that of wave has gradually damped by increased concentration of hydrogen gas. According to this study, it is confirmed the aluminum thin plate based hydrogen sensor is suitable to detect the hydrogen leakage of a hydrogen fuel cell vehicle.
원자력 수소 생산용 공정열교환기 모델의 고온설계 및 손상 평가
이형연(Hyeong-Yeon Lee),송기남(Kee-Nam Song),홍성덕(Sung-Deok Hong),김용완(Yong-Wan Kim),박홍윤(Hong-Yune Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The generation of hydrogen using nuclear energy has become a viable means in producing an emission-free energy. A process heat exchanger (PHE) transfers the heat generated from a nuclear hydrogen reactor to a sulfur-iodine hydrogen production system in the NHDD (Nuclear Hydrogen Development and Demonstration). The inlet temperature in the primary side of the PHE mockup in this study is 950℃ with an internal pressure of 7MPa while the inlet temperature in the secondary side of the PHE is 500℃ with internal pressure of 4MPa. An evaluation of creep-fatigue damage on the PHE mockup has been carried out from finite element analysis with the full three dimensional model of the PHE. The candidate materials of the PHE are Alloy 617 and Hastelloy X. In this study, Alloy 617 was considered as PHE material because a very high temperature design guideline is currently available only for Alloy 617 as ASME draft code case. Based on the 3D finite element analysis on the PHE model, creep-fatigue damage evaluation at very high temperature was carried out according to the ASME Draft Code Case for Alloy 617.
수소 연료전지 자동차용 초음파-광섬유 수소감지센서 및 모니터링 시스템 개발
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),기창두(Chang-Doo Kee),전인수(In-Su Jeon),양성모(Sung-Mo Yang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
We recently developed a hydrogen detecting sensor based on ultrasonic wave using optical-fiber detecting the hydrogen and monitoring system. This sensor is composed of an optical-fiber and an piezoelectric. Piezoelectric generates and receives ultrasonic wave. And an optical-fiber coated with palladium and platinum. In hydrogen environment, the volume of palladium is expanded because hydrogen were adsorbed in palladium. And the volume of palladium changes the propagation behavior of the ultrasonic wave. And now, we find the changed output signal in comparison with input signal. Furthermore we develop the monitoring system of hydrogen detecting sensor. The hydrogen monitoring system is composed of three part that is ultrasonic optical hydrogen sensor part, data acquisition server part and client part. The monitoring program is provide the concentration of hydrogen gas monitoring and database management, the remote monitoring by the ethernet(TCP/IP) network. As a result of this study, it is confirmed a hydrogen monitoring system based on utrasonic-optical fber is suitable for monitoring the hydrogen gas.
송형두(Hyeong-Doo Song),김시습(Si-Seup Kim),기성종(Seong-Jong Ki),김현일(Hyun-Il Kim),전인수(In-Su Jeon),기창두(Chang-Doo Kee) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.9
We recently developed a Hydrogen Detecting Sensor based on ultrasonic wave using optical-fiber to detect the hydrogen leakage. This sensor consists of simple structure by piezoelectric and optical-fiber. A piezoelectric generates and receives ultrasonic wave because this sensor is fabricated by pulse-echo system. And an optical-fiber coated with palladium and platinum. Ultrasonic wave is transmitted through optical-fiber. In hydrogen environment, the volume of palladium is expanded now that hydrogen molecules were adsorbed and inflated in palladium. and the expanded volume of palladium changes the propagation behavior of the ultrasonic wave. So, we can find the changed output signal in comparison with input signal. Moreover the amplitude of output signal gradually decreased according to increasement of hydrogen concentration. As a result of this study, it is confirmed a Hydrogen Detecting Sensor based on Ultrasonic-Optical Fiber is suitable as a sensor of detecting hydrogen gas.