• 정보화정책
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• 제23권4호
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• pp.59-75
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• 2016

융복합 시대에 정보통신기술(ICT)을 통해 금융거래 패러다임의 혁신을 꾀하고자 하는 핀테크의 발달이 주목받고 있다. 금융관련 서비스를 모바일 및 정보통신기술과 접목하려는 핀테크의 확산은 단순한 결제 및 송금서비스 외에 대출, 투자, 자산관리 등 보다 다양한 영역으로 확대되고 있으나 소비자들의 인식이 낮은 편이다. 따라서 다양한 핀테크 비즈니스에 관한 연구의 필요성이 요구되어지는 시점이다. 본 논문은 핀테크 사용자들의 지속사용의도에 어떠한 요인들이 영향을 미치는지를 소비자 관점의 실증연구를 수행하였다. 사용자특성 측면에서 보면, 혁신성은 만족도에 통계적으로 유의한 영향을 미치지 않는 것으로 나타났다. 또한 제품특성 측면에서는 지각된 위험은 만족도에 통계적으로 유의하지 않게 나타났다.

• 한국연소학회지
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• 제8권1호
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• pp.1-8
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• 2003

The behavior and characteristics of heavy metals at different streams in a MSWI(Municipal Solid Waste Incinerator) with a capacity of 100tonnes/day were investigated by measuring the concentration of heavy metals and gases and analyzing their leaching data from ashes. Metal components of Cr, Cu, Cd and Pb were in higher concentrations in the fly ashes collected after the water spray tower than in the bottom ashes. It was due to condensation by a lower temperature with water spray cooling. Metal contents in the bottom ash became higher for finer particles as expected. The mass balance of heavy metals in different stream was estimated from the analyzed data in bottom ash and collected dusts at different locations. For the lower volatility of metals such as Pb, Cu, Cr, 88-97% of them remained in the bottom ash, while Cd and Hg escaped from the combustor with remaining in bottom ash of 18.4 and 0.8%, respectively. In most cases the leaching rate of fly ash showed higher values than that of bottom ash, with the their average acidities of 9.8 and 11.9 respectively.

• 한국안전학회지
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• 제27권5호
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• pp.9-15
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• 2012

The ignition characteristics in a confined axisymmetric coflow $CH_4$ jet were investigated numerically with the Fire Dynamics Simulator(FDS). The $CH_4$ fuel stream was diluted with main combustion product gases, such as $O_2$, $N_2$, CO, $CO_2$, and $H_2O$, and the mixed fuel stream was heated up to the sufficient temperature where a supplying fuel stream can be ignited. For the calculation of chemical reaction in the simulation, a 2-step global finite chemistry model was considered. Boundary condition for confined wall was optimized by investigating the effects of wall temperature on the ignition characteristics of fuel stream. In addition, the effects of composition of diluents in the fuel stream and fuel stream temperature on the ignition of fuel steam were investigated. The ignition characteristics of $CH_4$ stream with diluents were very sensitive to the wall temperature, composition of diluents in the fuel stream and fuel stream temperature.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1691-1693
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• 2001

펄스형 Nd:YAG 레이저는 연속형에 비해 효율이 높고 높은 첨두 출력(peak power)이 가능하므로 가공에 있어서 여러 가지 장점이 있다. 더구나 레이저 펄스 모양을 가변시키는 기능은 펄스형 Nd:YAG 레이저로 가공하기 힘든 특수분야에까지 가공을 가능하게 하였다. 본 연구에서는 3개의 플래쉬램프를 순차 점등시키는 MD(multi-discharge)방식의 레이저 시스템을 설계 및 제작하여, 램프 점등 시간의 변화에 따른 레이저 빔의 펄스폭과 펄스 세기(펄스 크기)를 조사하였다. 즉, PIC One-Chip microprocessor를 이용하여 실시간으로 3개의 플래쉬램프를 순차적으로 점등시켜 보다 다양한 펄스 모양을 만드는 기술을 개발하였다. 위 방식의 장점은 램프의 점등 지연시간을 0 $\sim$ 10ms 까지 다양하게 변화시킬 수 있고, 외부의 키보드로 실시간 제어가 가능하므로 보다 편리하게 펄스 모양을 변화시킬 수 있다. 또한 긴 펄스를 만들 수 있어 산업용 가공이나 의료용으로 널리 사용될 수 있을 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1703-1705
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• 2001

The pulsed Nd:YAG laser is used widely for materials processing and medical instrument etc. It is important to control the laser energy in those fields using a pulsed Nd:YAG laser. In this paper, constant-frequency current resonant half-bridge inverter and Cockcroft-Walton circuit are used to charge the energy storage capacitor variably. This laser power supply is designed and fabricated which has no high-voltage transformer, less switching losses, compact size and capability in varying the laser output power. Also, the output characteristics of this Nd:YAG laser system are investigated. The tested results are described.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
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• pp.1121-1124
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• 2003

PZT(30/70) thick film was fabricated by using 1,3 propanediol-based sol-gel method. Prepared film of pyroelectric property was investigated by Dynamic method of modulation frequency dependence. Pyroelectric coefficient was obtained about 5.0$\times$10$^{-8}$ C/$\textrm{cm}^2$.K. The figure of merits for voltage responsivity and specific detectivity were 3.4$\times$10$^{-11}$ C.cm/J and 5.9$\times$10$^{-9}$ C.cm/J, respectively, because of relative high-dielectric constant and high-pyroelectric coefficient. Voltage responsivity was increased at low modulation frequency and it was decreased at high modulation frequency. Voltage responsivity was maximum 1.84 V/W at 10 Hz. As Johnson noise is dominant, Noise voltage was increased nearly proportional to f$^{-1}$ 2/. Noise equivalent power and specific detectivity were 2.83$\times$10$^{-7}$ W/Hz$^{1}$2/ and 3.13$\times$10$^{5}$ cm.Hz$^{1}$2//W the same frequency at 80 Hz, respectively.

• Archives of Reconstructive Microsurgery
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• 제7권2호
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• pp.95-101
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• 1998

From march 1993 to march 1998, twenty consecutive transmetacarpal replantations and revascularizations were reviewed retrospectively. Nine patients sustained severe and diffuse crush injuries, four patients had local crush injuries, and seven suffered guillotine type amputation. Six replantations and fourteen revascularizations were performed. 76 of 81 replantable digits(93%) were salvaged. 15 patients required secondary surgery, 10 patients for tendon and joint scarring and 5 for nonunions or malunions. Intrinsic muscle function and pinch and grip strengths were weak or absent. According to Chen's grading system of functional return, 2(10%) were grade I, 6(30%) were grade II, 10(50%) were grade III, and 2(10%) grade IV. The follow-up period ranged from 6months to 46 months. Only 3 patients resumed his prior occupation(one as a supervisor); 2 were permanently disabled, 4 pursued new occupations as a manual worker, 1 were still in therapy. Only two of the manual laborers were able to return to their preinjury occupation. Despite these unacceptable functional results, all patients were satisfied with the surgery.

• 융합보안논문지
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• 제20권3호
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• pp.71-78
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• 2020

비트코인에 기반한 블록체인 기술은 익명성이 있는 스마트 계약, 저렴한 송금, 온라인 거래 등을 가능하게 하는 하부구조를 제시하고 있다. 하지만, 비트코인을 구현하는 블록체인 기술은 처리량과 지연시간 간의 트레이드오프 관계에 있는 확장가능성 제한을 갖고 있다. 이러한 문제를 해결하기 위한 비잔틴 고장 감내 기반 블록체인 기술이 제안되었다. 이 기법은 리더를 선출하고 리더에 의해 기존 블록 내에 작업증명을 포함하지 않는 많은 마이크로 블록을 구성하여 지연시간 증가 없이 처리량을 향상시켰다. 하지만 이 기법은 리더를 선출하는 부분에서 기존 기법보다 보안성이 떨어질 수 있다. 본 논문에서는 마이크로 블록기술과 병행수행 기법을 통해 블록체인 기술의 확장가능성을 위한 기법을 제안한다. 하나의 마이크로 블록 내에는 여러 개의 거래에 대한 정보가 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2289-2291
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• 2002

In maned airport, crews may have risks as they manage passenger control system in IPMS in damage situations such as fire in a airport. So the application of unmanned autonomous system can reduce the number of boarding crews and attribute to safe airplane transportation. PBBC model can be used to obtain control strategy, and airplane and enhance operators' skill by simulating the airport. The paper suggests an intelligent system of the pbbc control using microprocessor in integrated platform management system which can take measures against passenger situation of a airplane excluding unnecessary warnings with undamaged situations. The system here detected the passenger more accurately and adopted more appriate measures according to airplane status compared with conventional systems.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2353-2356
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• 2002

The increase of vehicles stagnations leads to the increasing attention to the way customers pay and a large number of projects on electronic cash system. Tranport system is comprised of a number of advanced technologies, including information processing, communications, control, and electronics. Recently many research on a system which provides contact in order to protect driver's vehicle passage have been carried out. And some potential problems from that system are being reviewed by electronic cash system. In this papers, we suggest RF protocol developing technology using the concept of electronic cash. ATM electronic cash developing is consist of component of pre-developed coin throw, integration of component using its, and production of more requirement-satisfactory ITS solution. Result increase 15$\sim$40% pre-type vehicles stagnations. Especially, we expect this proposed concept would be well adapted to our national environments.