• JSTS:Journal of Semiconductor Technology and Science
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• v.9 no.3
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• pp.160-165
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• 2009

A 12b 2 MS/s cyclic ADC processing 3.3 Vpp single-ended rail-to-rail input signals is presented. The proposed ADC demonstrates an offset voltage less than 1 mV without well-known calibration and trimming techniques although power supplies are directly employed as voltage references. The SHA-free input sampling scheme and the two-stage switched op-amp discussed in this work reduce power dissipation, while the comparators based on capacitor-divided voltage references show a matched full-scale performance between two flash sub ADCs. The prototype ADC in a $0.18{\mu}m$ 1P6M CMOS demonstrates the effective number of bits of 11.48 for a 100 kHz full-scale input at 2 MS/s. The ADC with an active die area of $0.12\;mm^2$ consumes 3.6 m W at 2 MS/s and 3.3 V (analog)/1.8 V (digital).

• Korean Journal of Organic Agriculture
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• v.13 no.3
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• pp.229-242
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• 2005

This study was examined to analyze of the characteristics analysis of purchasing behavior for environment-friendly agri-products on consumers in Gwangju. The 310 subjects formatted questionnaires were analyzed to frequency, percentage, crosstabulation, chi-square test and logistic regression by SPSS WIN 10.0. The main results of this study were as followings (1) It was analyzed that consumers have had the reason to purchase, purchase places, purchase number of times, purchase background, optimum price and purchase item for environment-friendly agri-products. (2) It was tended that consumer showed degree of satisfaction, point to improve and purchase intention continuously for environment-friendly agri-products. (3) It was proved that age, income, medium contact level, cognitive level, valuation basis, producer and the direct deal, the consumer organization's co-op, large-sized discount hoarded goods for purchase places and price reduction for promotion of purchase for environment-friendly agri-products was of the characteristics analysis.

• The Journal of Korean Academic Society of Nursing Education
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• v.11 no.2
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• pp.127-134
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• 2005

Purpose: The purpose of the study was to develop a cooperative clinical nursing education model in response to the challenge to provide quality clinical instruction for nursing students. Method: A hypothesized model was developed based on literature review and Cho's partnership model of preservice teacher. Final model was refined with cooperative committee meetings, workshop and post clinical education meetings. Results: A Cooperative clinical nursing education model was developed with three phases(collaboration, planning, redefinition of major roles) and ten constructs(organization of cooperative committee, goal setting, partnership contract, planning objectives, and operating manual). Conclusion: The Cooperative clinical nursing education model support the need for continued collaborative partnership between nursing college and hospitals to foster quality clinical instruction.

• Proceedings of the KIPE Conference
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• 1997.07a
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• pp.166-170
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• 1997

A Single phase induction motor is the predominant fractional horsepower power rated, extensively used in domestic and industrial application. For example, these motors provide the motive power to washing machines, fans, refrigerators, etc. In this paper, single phase induction motor input current was detected by a small current transformer and determined TRIAC gate signal by using op-amp analog circuit. The soft-start strategy is based on limited auxiliary current angle during starting period in the closed-loop control. The Simulation and experimental result show the motor's starting characteristics of the proposal starting system and are compared with centrifugal switch starting motor.

• Journal of the Korean Society for Library and Information Science
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• v.19
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• pp.151-188
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• 1990

The aims of automation efforts in libraries are the rationalization of interval work and improvement of user services. After a period of exclusive internal computer utilization, later voluntary contact with the computer (e.g., circulation control with self services), patrons of American libraries now have to go to a computer terminal if they want certain information. Online public access catalogs(OPAC) have been used in American libraries since the end of the seventies. But OP AC are accepted by patron only if they have a useful and flexible user interface. This paper briefly describes the use of online catalogs in different type of libraries, categories of user (user, non-user), aspect of catalog use in context with computer experience etc. The disscussion then focuses on the characteristics of the final report of online catalog use study of Council on Library Resources and user problems in searching, as reported in many other catalog use studies.

• Journal of Power System Engineering
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• v.7 no.2
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• pp.51-55
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• 2003

Recently the requirements for light weight and high performance of the automobile have increased. Especially, the plastic fuel tube makers have made their efforts to dove]op the various plastic fuel tube module with not only dimensional accuracy but also cost competitiveness. The experiment is performed to investigate spring backs for PA12 plastic fuel tubes in case of compound bending. In the experiment, steam bending process is adopted as bending method. In this study, the results we obtained are used to design the bending fixtures and the compound bending system.

• Vending industry
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• v.7 no.1 s.19
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• pp.54-56
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• 2007

보건복지부는 지난 1월 중순 식품위생법 및 시행규칙을 개정함에 있어 자판기 영업신고 및 위생교육에 관한 개정령안을 포함시켜 입법예고를 진행했다. 이번 입법예고에 따르면 동일 관할 구역에서 2대이상 설치하여 영업하는 식품자동판매기 영업신고시 일괄신고의 범위를 읍.면.동에서 시.군.구로 확대해 자판기를 대량 운영하는 OP업체들의 행정낭비와 불편을 최소화 할 수 있게 했다. 아울러 자판기 영업자가 매년 받도록 되어 있던 위생교육을 2년마다 받도록 완화함으로써 위생교육에 대한 교육자의 불만과 시간낭비를 줄일 수 있게 했다. 이와 같은 식품위생법 및 시행규칙의 입법예고는 그간 본 협회의 지속적인 의견 개진과 건의가 받아들여진 결과로서 자판기 관련 운영자 준수사항에 대한 규제를 점차 업계 자율적으로 완화해 줬다는 점에서 의미가 크다 하겠다. 본 협회에서는 위와 같은 입법예고 사항에 대해 찬성은 하되, 위생교육의 경우는 더욱 규제 완화를 희망하는 내용의 의견서를 보건복지부에 제출했다. 보건복지부는 일부 개정법률에 대한 의견을 취합 반영하여 최종 법률공포를 진행하게 된다.

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.508-510
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• 2005

In this paper, we have studied for the current control method with high accuracy for the high power LED driver that is necessary to the lighting system using LEDs. The control performance of LED driver can be improved with the adjustment of current control boundary by introducing D/A converters for setting high-offset and low-offset. And microprocessor (ATmega128) and D/A converter with 8 bits resolution are used in the proposed driver so that LED's illumination can be remotely controlled by serial communication on the spot or by key input. In the results of performance tests, we confirmed that the proposed control method is superior to the conventional control method using op-amps.

• Journal of computational fluids engineering
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• v.10 no.2
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• pp.21-29
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• 2005

In this paper, we present the theoretical and numerical results of scavenge characteristics in a small subchamber of an HCCI(Homogeneous Charge Compression Ignition) engine. Two theoretical models are proposed in prediction of the scavenge time and the efficiency; one is the non-mixing model in which the input gas(CH4) and the existing gas(air) do not mix at all, and the other is the fully-mixed model in which the two gases are assumed to mix completely before ejection. Focus is also given to the effect on the scavenge performance of the size of the chamber outlet.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.1
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• pp.311-316
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• 2012

In this paper, chaotic circuit of the Lorentz system for engineering applications was implemented using resistor, multipliers, capacitors and operational amplifiers. The implemented Lorentz chaotic system was analysed by PSPICE program. PSPICE simulation results show many kind of chaotic phenomena such time waveforms and phase plots. Meanwhile, according to resistor's variation, we got that Lorentz system show equilibrium state, periodic state and chaotic state.