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60 μm의 전극 간극을 갖는 FET식 MWCNT 가스센서에서 열 유동 현상
장경욱,Jang, Kyung-Uk 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.6
Generally, MWCNT, with thermal, chemical and electrical superiority, is manufactured with CVD (chemical vapor deposition). Using MWCNT, it is comonly used as gas sensor of MOS-FET structure. In this study, in order to repeatedly detect gases, the author had to effectively eliminate gases absorbed in a MWCNT sensor. So as to eliminate gases absorbed in a MWCNT sensor, the sensor was applied heat of 423[K], and in order to observe how the applied heat was diffused within the sensor, the author interpreted the diffusion process of heat, using COMSOL interpretation program. In order to interpret the diffusion process of heat, the author progressed modeling with the structure of MWCNT gas sensor in 2-dimension, and defining heat transfer velocity($u={\Delta}T/{\Delta}x$), accorded to governing equation within the sensor, the author proposed heat transfer mechanism.
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장경욱,김윤태 韓國外國語大學校 外國學綜合硏究센터 中國硏究所 2005 中國硏究 Vol.36 No.-
Ever since 1978, when China adopted opening policy, Foreign Direct Investment(FDI) has played an important role in the process of economic development. The sustained development of Taiwan's investment in China is the necessary requirement for the Taiwan to develop its economy of modern handicraft industry and the certain trend toward economic integration. The location, size, industry and management in which Taiwan invests in China have a series of characteristics. meanwhile, the investors are confronting various difficulties and challenges. Understanding these characteristics are bound to promote the further economic integration between China and Taiwan and the formation of Chinese economic circle.
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장경욱 동양대학교 1999 동양대학교 논문집 Vol.5 No.1
This thesis aims to clarify the integrity of Whitman's consciousness, chasing after the various journey images in his poems. Whitman, one of the best American Renaissance poets, has been praised as the advocator of American democracy. But the democracy he tried to achieve did not have political significance only. It was a name for a new way of life. The democracy Whitman searched for was a state where human beings could live without inequality, torment, and persecution. So he needed a vision to include all races of men, heal all kinds of illness, and bridge all ruptures between man and man. The poetic self in Whitman's poems is the researcher for this new vision. And his poems are the records of the journey where the 'self' tries to get a new vision. On the road to this new vision, he calls upon all things his self could rely on. Those include death, nature, time and memory. At last he could achieve his own vision named as a democracy. But the problem was that he could not assure whether his vision was only an illusion or not. That constitutes a peculiar symmetry in his poems. This symmetry is broken when he shows too much confidence in his vision or when he lose that confidence. His later poems result from his skepticism about his poetic vision. Nevertheless, the brave journey Whitman went on was the genuine achievement in the modern history.
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웨어러블용 Nylon-Yarn NO<sub>x</sub> 가스 센서의 검출 온도 변화에 따른 열 특성 시뮬레이션
장경욱,Jang, Kyung-Uk 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.4
Atmospheric environmental problems have a major impact on human health and lifestyle. In humans, inhalation of nitrogen oxides causes respiratory diseases, such as bronchitis. In this paper, thermal analysis of a gas sensor was carried out to design and fabricate a wearable nylon-yarn gas sensor for the detection of NO<sub>x</sub> gas. In the thermal analysis method, the thermal diffusion process was analyzed while operating the sensors at 40 and 60℃ to secure a temperature range that does not cause thermal runaway due to temperature in the operating environment. Thermal diffusion analysis was performed using the COMSOL software. The thermal analysis results could be useful for analyzing gas adsorption and desorption, as well as the design of gas sensors. The thermal energy diffusion rate increased slightly from 10.05 to 10.1 K/mm as the sensor temperature increased from 40 to 60℃. It was concluded that the sensor could be operated in this temperature range without thermal breakdown.
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장경욱 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.3
In this study, the diffusion process and the thermal energy distribution gradient of the sensor were confirmed by usingthe finite element analysis program (COMSOL) of the mesh method to analyze the thermal diffusion in the wearablefabric (Nylon) + MWCNT gas sensor. To analyze the diffusion process of thermal energy, the structure of the gas sensor was modeled in a two dimensionplane. The proposed modeling was presented with the characteristic value for the component of the sensor, and the gassensor designed using the mesh finite element method (FEM) was proposed and analyzed by suggesting the one-waypartial differential equation in the governing equation to know the degree of thermal energy diffusion and the thermalenergy gradient. In addition, the temperature gradient 10[K/mm] of the anode-cathode electrode layer and the gas detection unit wasinvestigated by suggesting the heat velocity transfer equation. 요 약 본 연구에서는 웨어러블 Fabric (Nylon) + MWCNT 가스센서 내부에서 열확산을 해석하기 위해서 요소해석 프로그램(comsol)을 이용하여 센서 내부에서의 열용량의 확산 과정과 열용량 분포 경도를 확인하였다. 열용량의 확산과정을 해석하기 위해서 가스센서의 구조체에 대하여 이차원으로 모델링을 진행하였으며, 제시된 모델링에대해서 센서 구성 부분에 대한 특성값을 제시하여 메시 요소법(FEM)을 이용하여 설계된 웨어러블 가스센서에 대해서 열용량이 확산되는 정도와 열용량 경도를 구하기 위해서 지배방정식으로 1계 편미분방정식을 제안하여 해석하였으며, 열속도 전달식을 제안하여 전극층과 가스 검출부의 10[K/mm] 온도 경도를 구하였다.
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반응성 액상 소결법으로 제조한 다공성 Mg<sub>3</sub>Sb<sub>2</sub>계 화합물의 열전물성
장경욱,김인기,김일호,Jang, Kyung-Wook,Kim, In-Ki,Kim, Il-Ho 한국재료학회 2015 한국재료학회지 Vol.25 No.2
The porous $Mg_3Sb_2$ based compounds with 60~70% of relative density were prepared by powder compaction at room temperature and reactive liquid phase sintering at 1023 K for 4hrs. The stoichiometric $Mg_3Sb_2$ compounds were synthesized from elemental Sb and Mg powder in the mixing range of 61~63 at% Mg. The increased scattering effect due to the micro-pores reduced the mobility of the charge carrier and the phonon, which caused the electrical conductivity and the thermal conductivity to decrease, respectively. But the scattering effect was greater for the electrical conductivity than for the thermal conductivity. Excess Mg alloyed in the $Mg_3Sb_2$ compounds decreased the electrical conductivity, but had no effect on the thermal conductivity. On the other hand, the large increase of the Seebeck coefficient was the result of a decrease in the charge carrier density due to the excess Mg. Dimensionless figure of merit of the porous $Mg_3Sb_2$ compound reached a maximum value of 0.28 at 61 at% Mg. The obtained value was similar to that of $Mg_3Sb_2$ compounds having little pores.
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