• Proceedings of the KIEE Conference
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• 2005.05a
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• pp.275-277
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• 2005

In a lithium-ion battery which is being used in many portable electronic goods, electrolyte is disaggregated and then the gas is happened when electric charging volt is over the 4.5V. So, the pressure on the safety valve is increased and electrolyte is leaked out in the cell. It leads to the risk of explosion. On the other hand, in the case which the battery is discharged excessively, the negative pole is damaged and the performance of the battery is deteriorated. The protection module of a lithium-ion battery is used for preventing such risk and the inspection system is needed to check the performance of such protection module. In this research, a PC-based auto inspection system is developed for the inspection of a battery protection module using Dallas chipset. In the inspection system, AVRl28 chip is used as a controller and the communication protocol is developed for the data communication between the protection module and the AVR128 chip. And GPIB interface is used for the control of measuring devices. Also, MMI environment is developed using LabView for convenient monitoring by the tester.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1772-1773
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• 2011

현대기술의 발전에 따라 계측기술 또한 다양하고 복잡하게 변모하였으며, 정밀측정기기의 교정 업무에서는 복잡하고 정확한, 반복적이며 계속적인 데이터 취득을 요구한다. 또한 여러 장비를 사용할 경우, 장시간 소요되는 데이터 취득과 정확한 계측기 사용법 및 고도의 관련기술을 필요로 한다. 그러므로 컴퓨터를 이용 한 계측장비 제어로 측정에 필요한 시간을 최대한 단축하고, 개인오차를 제거할 수 있는 동일한 결과와 쉽게 데이터를 취득할 수 있도록 측정자동화가 필요하다.

• Journal of Energy Engineering
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• v.24 no.3
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• pp.20-26
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• 2015

For the reliability of the combustible properties of arylic acid, this study was investigated the explosion limits of acrylic acid in the reference data. The flash points and AITs(auto-ignition temperatures) by ignition delay time were experimented. The lower flash points of acrylic acid by using Setaflash and Pensky-Martens closed-cup testers were experimented in $48^{\circ}C$ and $51^{\circ}C$, respectively. The lower flash points of arylic acid by using Tag and Cleveland open cup testers were experimented in $56^{\circ}C$. This study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for acrylic acid. The AIT of acrylic acid was experimented as $417^{\circ}C$. The lower explosion limit(LEL) and the upper explosion limit(UEL) by the measured the lower flash point and the upper flash point of acrylic acid were calculated as 2.2 Vol% and 7.9 Vol%, respectively.

• Fire Science and Engineering
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• v.23 no.1
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• pp.21-32
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• 2009

In order to inspect the danger of forest fires, the thermal characteristics and the ignitability of the dead leaves and the living leaves for the main species of trees in Youngdong areas have been studied by the TG/DTA and the group flammability tester. From this work, the thermal delay has been increased with the increase of the heating rate. The fractions of the thermal weight loss for the dead leaves and the living leaves of the coniferous trees were higher than those of the broadleaf trees. Also, it was confirmed that the ignitable dangers of the dead leaves and the coniferous trees were higher than those of the living leaves and the broadleaf trees, due to the low auto ignition temperature and thermal resistance.

• Journal of the Korean Institute of Gas
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• v.18 no.3
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• pp.75-81
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• 2014

For the safe handling of isobutylalcohol(IBA), this study was investigated the explosion limits of isobutylalcohol in the reference data. And the lower flash points, upper flash points and AITs(auto-ignition temperatures) by ignition delay time were experimented. By using the literatures data, the lower and upper explosion limits of isobutylalcohol recommended 1.7 Vol% and 10.9 Vol.%, respectively. The lower flash point of isobutylalcohol by using Setaflash and Penski-Martens closed-cup testers were experimented $25^{\circ}C$ and $30^{\circ}C$, respectively. The lower flash point isobutylalcohol by using Tag and Cleveland open cup testers were experimented $36^{\circ}C$ and $39^{\circ}C$, respectively. Also, this study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for isobutylalcohol. The experimental AIT of isobutylalcohol was $400^{\circ}C$.

• Journal of Energy Engineering
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• v.23 no.4
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• pp.169-175
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• 2014

For the safe handling of ethylbenzene, this study was investigated the explosion limits of ethylbenzene in the reference data. And the lower flash points, upper flash points and AITs(auto-ignition temperatures) by ignition delay time were experimented. The lower flash points of ethylbenzene by using Setaflash closed-cup and Pensky-Martens closed-cup testers were experimented $20^{\circ}C$ and $22^{\circ}C$, respectively. The lower flash points ethylbenzene by using Tag and Cleveland open cup testers were experimented $25^{\circ}C$ and $28^{\circ}C$, respectively. Also, this study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for ethylbnezene. The experimental AIT of ethylbenzene was $430^{\circ}C$. The calculated LEL and UEL by using the measured lower flash point and upper flash point were 0.93 Vol.% and 7.96 Vol.%, respectively.

• Journal of the Korean Society of Safety
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• v.29 no.3
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• pp.114-120
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• 2014

The purpose of this study is to conduct the study of the combustion and thermal characteristics through transportation oil for the analysis of fire hazard. Transportation oil breaks down into fuels such as diesel for civilian demands, gasoline, DF1(diesel for military), high sulfur diesel(for marine), kerosene and JP1(for aviation), and lubricants like brake fluid, power steering oil, engine oil, and automatic and manual transmission oil. The experiments of flash point, ignition point, flame duration time, heat release rate were carried out using TAG closed cup flash point tester(AFP761), Cleveland open cup auto flash point analyzer(AFP762), KRS-RG-9000 and Dual cone calorimeter. As a result, the fuel's ignition points were lower than lubricants, especially that of gasoline was not conducted as it has below zero one. Gasoline has the highest ignition point of about $600^{\circ}C$, while the other fuels showed $400{\sim}465^{\circ}C$. For flame duration time, lubricants had over 300 seconds, but fuels had less than 300 seconds except high sulfur diesel(350 seconds). Total heat release rate ranged $287{\sim}462kW/m^2$ for lubricants and gasoline showed the highest total heat release rate, $652kW/m^2$.

• Journal of the Korean Institute of Gas
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• v.18 no.4
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• pp.44-50
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• 2014

For the safe handling of aniline, this study was investigated the explosion limits of aniline in the reference data. And the lower flash points, upper flash points and AITs(auto-ignition temperatures) by ignition delay time were experimented. The lower flash point of aniline by using Setaflash and Penski-Martens closed-cup testers were experimented $66^{\circ}C$ and $73^{\circ}C$, respectively. The lower flash point aniline by using Tag and Cleveland open cup testers were experimented $72^{\circ}C$ and $78^{\circ}C$, respectively. Also, this study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for aniline. The experimental AIT of aniline was $590^{\circ}C$. The calculated LEL and UEL by using the measured low flash point and upper flash point were 1.16 Vol.% and 8.36 Vol.%, respectively.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.41 no.6
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• pp.43-49
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• 2004

Electric pulp test is a method to examine the vitality of dental pulp using physical and chemical stimulation. During the pulp test, the current stimulates intradental nerve, and it makes patients painful. In this paper, we measured each activating response EMG in anterior belly of digastric muscle, voice, and finger movement during the pulp test by increasing stimulus intensity gradually. We also measured excessive stimulus time from the activating responses (EMG, voice, and finger movement) to the end of the stimulation. We measured and analyzed excessive stimulus time for each stimulus detecting method. As a result, we developed automatic stimulus breaker using the human responses to stimulus during electric pulp test. We reduced the excessive stimulus time by disconnecting the pulp tester stimulus output rapidly in 10 ms after activating human response.

• Journal of Korean Ophthalmic Optics Society
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• v.17 no.4
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• pp.419-424
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• 2012

Purpose: We were to obtain the basic data for studying kinetic visual acuity through the comparative analysis in kinetic visual acuity, visual acuity, refractive error, pupil size, and hand reaction time for college students. Methods: We had tested the kinetic visual acuity, visual acuity, refractive error and hand reaction time using the kinetic visual acuity tester (KOWA AS-4A), the hand reaction time program and auto-refractometer for thirty-nine male and same female optometry students with more than +0.1 LogMAR visual acuity in both eyes. And the results were examined gender differences of kinetic visual acuity and the factors correlation. Results: In the measured values of male, pupil size were 6.00 mm, hand reaction time 0.23 msec, refractive error -1.66 D, visual acuity -0.07, kinetic visual acuity 0.59 and pupil size 5.86 mm, hand reaction time 0.24 msec, refractive error -2.08 D, visual acuity -0.02, kinetic visual acuity 0.46 in female. It was significant difference for kinetic visual acuity values but other factors were not. The kinetic visual acuity and left visual acuity had the highest correlation, r=-0.406. The kinetic visual acuity indicated more excellent values in the case of increasing visual acuity and decreasing myopia amount. Conclusions: It was able to see that male college students were better than female for kinetic visual acuity and the visual acuity were related to kinetic visual acuity.