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- 저자 : 김진목 (검색결과 109 건)
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X-선 미소열량계 신호 검출을 위한 광대역 SQUID 전류증폭기와 조절 회로
김진목,이용호,권혁찬,김기웅,박용기 한국초전도학회 2003 Progress in superconductivity Vol.5 No.1
Wide-bandwidth SQUID current amplifier and its control electronics have been constructed for detecting pulse outputs of a superconducting microcalorimeter. The current amplifier made of a double relaxation oscillation SQUID (DROS) has a bandwidth of 1.2 MHz and typical white noise level of about 6 pA/(equation omitted) Hz. To increase the dynamic range of the current amplifier, the flux-locked loop (FLL) has additional circuits to reset the integrator and to count reset numbers which present the number of passed flux quanta. In this system, dynamic range covers from -65 mA to +65 mA. SQUID electronics are controlled by software to get the optimum FLL condition, and to control the current to bias the transition edge sensor (TES). The electronics are shielded from the outside electromagnetic noises by using an aluminum case of 66 mm ${\times}$ 25 mm ${\times}$ 100 mm, and consist of 2 separate printed-circuit-boards for the current amplifier and the control electronics, respectively. The SQUID current amplifier and its control electronics will be used in TESs for detecting photons such as UV and X-ray with high energy resolution.
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The study on the Quantitative analysis of Aflatoxin B<sub>1</sub> from Pear
김진목,진주희,장향동,백광균,김태현,류성렬 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-
Aflatoxin B<sub>1</sub> was known to have the strongest poisonous character among aflatoxin compounds. To search the production of aflatoxin B<sub>1</sub> according to the change of temperature and relative humidity, pear incubated with aspergillus flavus KCCM 35078 was incubated at 25°C, 30°C, 35°C, 40°C and at relative humidity 50%, 60%, 70% and for incubation time 3, 4, 5, 6, 7, 8, 9days. Production of aflatoxin B<sub>1</sub> shows that the highest production appeared at 30°C and its relative humidity 70%. The result that was quantitatively analyzed by using HPLC was 41.11 ppm, and by using fluoroscence detector was 42.82ppm Production of aflatoxin B<sub>1</sub> shows that the lowest production appeared at 40 °C and its relative humidity 70%. The result that was quantitatively analyzed by using HPLC was 3.1 ppm, and by using fluorescence detector was 3.02ppm The structure of aflatoxin B<sub>1</sub> was identify with authentic sample by using instrumental analysis methods of FT-IR, MS and <sup>1</sup>H-NMR, respectively.
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저성능 자기차폐실에서 64채널 DROS 2차 미분계 시스템의 잡음 특성
김진목,이용호,유권규,김기웅,권혁찬,박용기,Kim, J.M.,Lee, Y.H.,Yu, K.K.,Kim, K.,Kwon, H.,Park, Y.K.,Sasada, Ichiro 한국초전도학회 2006 Progress in superconductivity Vol.8 No.1
We have developed a second-order double relaxation oscillation SQUID(DROS) gradiometer with a baseline of 35 mm, and constructed a poorly magnetically-shielded room(MSR) with an aluminum layer and permalloy layers for magnetocardiography(MCG). The 2nd-order DROS gradiometer has a noise level of 20 $fT/{\surd}Hz$ at 1 Hz and 8 $fT/{\surd}Hz$ at 200 Hz inside the heavily-shielded MSR with a shielding factor of $10^3$ at 1 Hz and $10^4-10^5$ at 100 Hz. The poorly-shielded MSR, built of a 12-mm-thick aluminum layer and 4-6 permalloy layers of 0.35 mm thickness, is 2.4mx2.4mx2.4m in size, and has a shielding factor of 40 at 1 Hz, $10^4$ at 100 Hz. Our 64-channel second-order gradiometer MCG system consists of 64 2nd-order DROS gradiometers, flux-locked loop electronics, and analog signal processors. With the 2nd-order DROS gradiometers and flux-locked loop electronics installed inside the poorly-shielded MSR, and with the analog signal processor installed outside it, the noise level was measured to be 20 $fT/{\surd}Hz$ at 1 Hz and 8 $fT/{\surd}Hz$ at 200 Hz on the average even though the MSR door is open. This result leads to a low noise level, low enough to obtain a human MCG at the same level as that measured in the heavily-shielded MSR. However, filters or active shielding is needed fur clear MCG when there is large low-frequency noise from heavy air conditioning or large ac power consumption near the poorly-shielded MSR.
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김진목,이용호,권혁찬,유권규,김기웅,박용기,Kim, J.M.,Lee, Y.H.,Kwon, H.,Yu, K.K.,Kim, K.,Park, Y.K.,Sasada, Ichiro 한국초전도학회 2007 Progress in superconductivity Vol.9 No.1
We have installed a 61-channel magnetocardiography (MCG) system inside a magnetically shielded room (MSR) with a size of $2.4\;m\;{\times}2.4\;m\;{\times}2.4\;m$. The MCG system consists of 1st-order axial gradiometers containing double relaxation oscillation SQUIDs (DROSs) with pick-up coils of a base line of 70 mm. The MSR holds a shielding factor of 50 at 0.1 Hz and 10000 at 100 Hz, when its door in the middle on a front wall is closed. On opening the MSR door, we have obtained the characteristics of the MCG system with a 2.9 Hz noise generated from an air conditioning unit at 13 m distance off the MSR. In an open-door MSR ($140^{\circ}$ opening), a noise at the center channel increases up to $700\;fT/Hz^{l/2}$ at 2.9 Hz and $1.7\;pT/Hz^{1/2}$ at 60 Hz. MCG signals for a healthy human do not show distortion until the door opens to $45^{\circ}$, but show the effect of noise when the door opens further at $90^{\circ}$ and $140^{\circ}$. With the door opens to $45^{\circ}$, MCG measurement can be performed with ease of door operation and without creating claustrophobia for the patient.
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