• Journal of the Korean Society of Tobacco Science
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• v.30 no.2
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• pp.117-124
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• 2008

A solid phase microextraction (SPME) method in combination with gas chromatography/mass spectrometric techniques was used for the extraction and quantification of 12 selected agrochemical residues in tobacco. The parameters such as the type of SPME fiber, adsorption/desorption time and the extraction temperature affecting the precision and accuracy of the SPME method were investigated and optimized. Among three types of fibers investigated, polyacrylate (PA), polydimethylsiloxane (PDMS) and polydimethylsiloxane-divinylbenzene (PDMS-DVB), PDMS fiber was selected for the extractions of the agrochemicals. The SPME device was automated and on-line coupled to a gas chromatograph with a mass spectrometer. Mass spectrometry (MS) was used and two different instruments, a quadrupole MS and triple quadrupole MS-MS mode, were compared. The performances of the two GC-MS instruments were comparable in terms of linearity (in the range of 0.01$\sim$0.5 $\mu$g/mL) and sensitivity (limits of detection were in the low ng/mL range). The triple quadrupole MS-MS instrument gave better precision than that of quadrupole MS system, but generally the relative standard deviations for replicates were acceptable for both instruments (< 15%). The LODs was fully satisfied the requirements of the CORESTA GRL. Recoveries of 12 selected agrochemicals in tobacco yielded more than 80% and reproducibility was found to be better than 10% RSD so that SPME procedure could be applied to the quantitative analysis of agrochemical residues in tobacco.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.341-344
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• 1999

본 논문에서는 DSP 기능을 내장한 32비트 RISC 마이크로프로세서를 위한 버스 제어기를 설계하였다. 연구의 초점은 버스 타이밍, 주소 멀티플렉싱, 리프레쉬, 버스 중재 등을 제어하는 버스제어기를 온칩화 하여 CPU로 하여금 외부 램과 추가적인 장치없이 직접 연결될 수 있도록 한 것이다. 버스 제어기가 관리하는 메모리의 종류는 SRAM, ROM, DRAM, EDO DRAM이며 고속 모드(Fast page mode, EDO page mode 및 RAS-down mode)기능을 지원하며 다양한 Wait를 넣을 수 있다. 주소 영역은 4가지(EMAO-EMA3)이며 내부적으로 7개 의 레지스터가 있고 이들을 이용하여 서로 연결된 세 개의 상태 머신으로 모든 램과의 타이밍을 제어함으로써 공유블록을 활용할 수 있었다. Verilog HDL의 기술하고 Synopsys로 합성한 후 타이밍 검증을 수행한 결과 최악조건에서 53.1㎒로 동작할 수 있었다. 그 후 0.6㎛ single poly triple metal process 공정으로 레이아웃 되었고 면적은 44㎜ × 1.21㎜ 이다.

• Journal of Contemporary Eastern Asia
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• v.17 no.1
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• pp.68-93
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• 2018

With the emergence of partnerships with private actors in public and cultural diplomacies, complexity in the relations among the various stakeholders involved has arisen, and yet the relevant research is insufficient to shed any beneficial light on such issues. By looking at public-private partnerships, the present study determined that resource dependence, trust, and risk are the main factors affecting the feasibility of partnerships, and inductively developed propositions on their effects. In an explorative case study, Germany (decentralized mode of governance) and South Korea (centralized mode of governance) were compared as exemplary contrasting system designs. The results revealed that risk and trust are likely to affect the feasibility of partnerships, whereas resource dependence is not. The following additional findings also were made: (1) there are cultural actors in a 'for profit, but with non-profit purposes' sector; (2) an interpersonal level of trust positively affects partnerships; (3) 'taking risks' brings about 'innovation'; (4) the existence of international commonalities between any two cases depending on the actors' shared role, whether public or private; (5) public actors' emphasis on mutual trust, program budget and execution, innovations coming from taking risks, commitment and ownership, and unexpected situations; (6) private actors' consideration of 'publicness' and grant-seeking or financial support as important incentives, and their desire that public actors to show more trust, professionalism, and ownership with less control over budget execution. With its qualitative approach and in-depth analysis, the present study yielded new insights, notwithstanding the relatively small sample data.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.07a
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• pp.751-754
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• 2000

When charge-trap SONOS cells are used flash memory, the tunneling program/erase condition to minimize the generation of interface traps was investigated. SONOSFET NVSM cells were fabricated using 0.35$\mu\textrm{m}$ standard memory cell embedded logic process including the ONO cell process. based on retrograde twin-well, single-poly, single metal CMOS process. The thickness of ONO triple-dielectric for memory cell is tunnel oxide of 24${\AA}$, nitride of 74 ${\AA}$, blocking oxide of 25 ${\AA}$, respectively. The program mode(Vg: 7,8,9 V, Vs/Vd: -3 V, Vb: floating) and the erase mode(Vg: -4,-5,-6 V, Vs/Vd: floating, Vb: 3V) by modified Fowler-Nordheim(MFN) tunneling were used. The proposed programming condition for the flash memory of SONOSFET NVSM cells showed less degradation($\Delta$Vth, S, Gm) characteristics than channel MFN tunneling operation. Also the program inhibit conditions of unselected cell for separated source lines NOR-tyupe flash memory application were investigated. we demonstrated that the program disturb phenomenon did not occur at source/drain voltage of 1 V∼4 V and gate voltage of 0 V∼4.

• Mass Spectrometry Letters
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• v.9 no.4
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• pp.95-99
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• 2018

An innovative, simple, and rapid assay method based on liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) was developed and validated for the simultaneous determination of eight statin drugs in human urine. A simple sample clean-up procedure using the "dilute and shoot" (DAS) approach enabled a fast and reliable analysis. The influence of the dilution factor was investigated to ensure detectability and reduce the matrix effect. Chromatographic separation was performed on a Phenomenex Kinetex C18 column ($50{\times}3.0mm$ i.d., $2.6{\mu}m$) using an elution gradient of mobile phase A composed of 0.1% acetic acid, and mobile phase B composed of acetonitrile, at a flow rate of 0.35 mL/min. Quantitation was performed on a triple quadrupole mass spectrometer operated in multiple reaction monitoring (MRM) mode using electrospray ionization in positive ion mode. The total chromatographic run time was 15 min. The method was validated for selectivity, sensitivity, recovery, linearity, accuracy, precision, and stability. The present method was successfully applied to the analysis of Rosuvastatin in urine samples after oral administration to healthy human subjects.

• ETRI Journal
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• v.29 no.2
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• pp.162-168
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• 2007

A new scheme for bi-directional HDTV/Gigabit Ethernet/CATV transmission over a hybrid dense-wavelength-division-multiplexing passive optical network (DWDM-PON) is proposed and demonstrated. It is based on injection-locked vertical-cavity surface-emitting lasers and distributed-feedback laser diodes as transmitters. Services with 129 HDTV channels, a 1.25 Gbps Gigabit Ethernet connection, and 77 CATV channels are successfully demonstrated over 40 km single-mode fiber links. Good performance of bit error rate, carrier-to-noise ratio, composite second order, and composite triple beat is achieved in our proposed bidirectional DWDM-PON.

• Journal of the Korean Chemical Society
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• v.60 no.6
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• pp.410-414
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• 2016

The anharmonic frequency of a local OH stretching mode of a water monomer and dimer was calculated using various levels of density functional theory. The quantum chemical potential energy curves as a function of the OH bond distance were calculated, and they were fitted with the Morse potential function to analytically obtain the fundamental transition frequency. By comparing those values with the frequencies similarly calculated using an ab initio quantum chemical method, the coupled cluster theory including both single and double excitations with the perturbative inclusion of triple excitation in the complete basis limit, the accuracy of various density functional methods in the calculation of anharmonic vibration frequency of water molecules was assessed. For a water monomer, X3LYP and B3LYP methods give the best accuracy, whereas for a water dimer, B972, LCBLYP, ${\omega}B97X$, ${\omega}B97$ methods show the best performance.

• Proceedings of the KIPE Conference
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• 1996.06a
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• pp.43-46
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• 1996

The carborne Automatic Train Control(ATC) system keeps automatically optimum train speed code signals from wayside(track) circuit equipment. If there is no response for braking against the over speed detected, the driver will be noticed instantly by visual and audible warning signals. And then the ATC processes into braking mode for safe train operations to prevent any hazards by over speed limit. In this paper we are introduced the novel ATC system which has triple constructed structure made by 32 bit floating point DSP(ADSP21020-20) and process dealed with frequency domain and time domain for detecting signals. Owing to these reason it is no needed several band pass filters used in conventional ATC systems to detect the speed limit frequency. Also system's reliability and tolerance are incremented by adopt to 2 out of 3 logic to the outputs decision.

• ETRI Journal
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• v.36 no.1
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• pp.163-166
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• 2014

A microstrip dual-wideband bandpass filter using a multimode resonator (MMR) is proposed in this letter. The proposed MMR loaded with a T-shaped open-ended stub and a short-ended stub exhibits triple mode characteristics, and a synthesis method is developed to illustrate the wide passband with independently controllable center frequencies and bandwidths. To verify this design methodology, a dual-wideband filter with fractional bandwidths of 19.1% and 27.9% is designed and fabricated. The measured results agree with the simulations.

• Journal of Chest Surgery
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• v.21 no.6
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• pp.1030-1039
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• 1988

From 1985 through Oct. 1988, we have experienced 5 cases of Aorto-Coronary Bypass Surgery [ACBS] and 3 cases of Percutaneous Transluminal Coronary Anogioplasty [PTCA]under the diagnosis of unstable angina. There were 6 males and 2 females who ranged from 48 to 70 years old. Almost all patients had a evidence of hypertension & hyperlipidemia. Two patients showed old myocardial infarction and remaining patients showed myocardial ischemia on resting state. The patterns of involvement of coronary artery disease were single vessel disease [4 cases], double vessel disease [3 cases], Triple vessel disease [1 case]. Among 5 cases of ACBS, double bypass graft was in 3 cases and single bypass graft was in 2 cases. Mode of anastomosis were all individual anastomosis, using Saphenous vein graft. Postoperative complications were perioperative myocardial infarction [2 cases], postoperative bleeding [1 case], leg wound disruption [1 case]. Perioperative myocardial infarction cases didn*t survive. In cases of PTCA, there were no complications. Follow up periods were ranged from 1 month to 25 months. All survived cases were asymptomatic except one case, who showed Functional Class II.