• Journal of Korean Academy of Fundamentals of Nursing
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• v.19 no.1
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• pp.122-133
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• 2012

Purpose: The purpose of this study was to develop a web-based education program on control vancomycin-resistant enterococci (VRE) infections and to identify the effects of the program on knowledge and performance of nursing students. Methods: The web-based VRE infection control education program was developed by using the network-based instructional systems design model. The nursing students in the experimental group could access this web-based education program at any time, and as many times as they wanted, during the clinical training period. Effects were evaluated by assessing knowledge and performance of VRE infection control measures during the clinical training period. Results: The contents of the education program included diagnosis, transmission, and treatment of VRE, contact precautions, hand washing, personal protective equipment, environment management, and quizzes. The lecture portion was filmed in a virtual screen studio using flash animation, video, and sound effects, and it was uploaded on an internet site. The knowledge and performance scores of the experimental group after using the education program were significantly higher than those of the control group. Conclusion: The results suggest that the web-based VRE infection control education program is an effective educational method to enhance knowledge and performance of VRE infection control measures.

• The Journal of Society for e-Business Studies
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• v.8 no.3
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• pp.165-176
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• 2003

Instead of existing cell phones, PDAs are observed as leading wireless Internet devices recently Numerous applications are developed by extended usage of PDAs and it should be installed appropriately according to devices. Furthermore, when battery is discharged, all data stored in RAM(Random Access Memory) becomes obsolete. So it should be recovered or reinstalled from flash memory, backup media or something. In this paper, we present an automatic application installation system(PAIS : PDA Automatic Installation System) to solve problems that users have to install applications by themselves whenever it is necessary. With this system, users feel comfortable by saving time and effort to install each applications and application development companies save cost needed to make materials illustrating installation process. Consequently PAIS may flourish wireless Internet business.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.5
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• pp.367-373
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• 2001

A programmable A/D converter is designed with 8 N and P channel MOSFETs, respectively. In order to observe linear programmability of the EEPROM device during programming mode, a cell is developed with a 1.2 ${\mu}{\textrm}{m}$ double poly CMOS fabrication process in MOSIS. It is observed that the high resolution, of say 10m Volt, is valid in the range 1.25volts to 2volts. The experimental result is used for simulating the programmable 8 bit A/D converter with Hspice. The A/D converter is demonstrated to consume low power, 37㎽ by utilizing a programming operation. In addition, the converter is attained at the conversion frequency of 333 MHz.

• 한국정보교육학회:학술대회논문집
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• 2010.08a
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• pp.179-184
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• 2010

In current knowledge-based society, various information and communication tools are used in educational fields. Especially web becomes the most popular tool. However, for the disabled, web accessibility is a still main problem to overcome. The purpose of this paper is to improve web accessibility of color blindness by analyzing the educational web sites. The three suggestions for this study are as follows. First, use accent colors other then red or orange. Second, add the black and white conversion feature function on the screen. Third, construct colors of video clips and flash files that are appropriate for people with color blindness.

• Journal of the Korean Society for Precision Engineering
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• v.28 no.7
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• pp.827-833
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• 2011

Precision forging of gears has a lot of advantages when compared to conventional gear shaping, because it allows the manufacture of gear parts without flash and consequently without the need for subsequent machining operations. In this study, the cold forging process is determined to manufacture the cold forged product for the precision clutch gear used of a commercial automobile, To do this, shape ratio of initial shape having influence the forgeability of forged product is analyzed. The optimal initial shape of clutch gear is designed using the results of DEFORM-3D and the artificial neural network (ANN). The initial shape through the detail analysis results, such as metal flow, distributions of strain can be obtained.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.140-145
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• 2007

최근에 에너지의 효율성이 좋고 대용량화가 쉬운 낸드 플래시가 센서 노드를 위한 차세대 저장소로 각광을 받고 있다. 현재 대부분의 센서 노드용 파일 시스템은 노어 플래시 기반으로 개발되어 있으며 낸드 플래시에 적용할 수 있는 파일 시스템은 거의 존재하지 않는다. 대용량 낸드 플래시 메모리의 특성을 고려한 새로운 파월 시스템의 구축이 요구되지만, 센서 노드는 오직 4-10 KByte의 매우 작은 크기의 메모리를 지원하므로 효율성이 뛰어난 파일 시스템을 구축하는 것은 매우 어렵다. 본 논문은 1 Kbit의 매우 작은 크기의 EEPROM을 부착하여 이러한 메모리 한계를 극복하였으며 자원의 효율성, 대용량의 지원 및 신뢰성을 고려한 새로운 파일 시스템의 설계에 대하여 논한다. 위치를 유지해야 하는 데이터의 위치저장을 위하여 EEPROM을 사용하며 장기간 데이터를 수집할 때 페이지의 갱신을 최소화 할 수 있는 로그 리스트 기반의 페이지 처리 방법에 대해 제안한다. 이는 획기적으로 페이지 갱신 횟수를 줄임으로써 에너지를 절약하고 보다 긴 시간동안 데이터의 수집을 용이하게 만들며 센서 노드의 수명을 증가시킨다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.885-888
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• 2007

본 논문은 무선 센서노드에서 측정되는 데이터들에 대한 저장 및 검색을 효율적으로 하기 위한 플래시 메모리 공간 관리 기법을 제안한다. 플래시 메모리는 외부 충격에 강하고, 비휘발성이며 접근이 빠른 장점이 있지만, 덮어쓰기 및 쓰기 횟수가 제한되는 단점이 있다. 이러한 특성으로 플래시 메모리는 기존의 저장매체와는 다른 관리 방법이 요구되었고 지금까지의 센서노드에서는 플래시 메모리를 사용 하지 않았다. 본 논문에서는 센서노드안의 플래시 메모리에서 순차적으로 측정되는 데이터를 관리하기 위해 LFS(Log-Structured File System)방식을 제안한다. 그리고 순차적으로 정렬된 데이터에 효율적인 검색방법을 제시하고, 이를 ZigbeX Mote의 TinyOS안에서 NesC로 구현하였다.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.51 no.1
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• pp.32-38
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• 2002

This paper describes a development of a portable physical activity monitoring system using two accelerometers to quantify physical activity. The system hardware consists of two piezoresistive accelerometers, amplifiers with gain of 30, lowpass filters with cut-off frequency of 15Hz, offset control circuits, one-chip microcontroller and flash memory card. In order to evaluate the performance of the system we acquired 3 channel data at 32 sample/sec from body-fixed accelerometers in chest and right upper leg. And then the acquired data were processed by MatLab on personal computer. We tried to distinguish not only fundamental actions which are steady-state activities such as standing, sitting, and lying but also dynamic activities with walking, up a stairway, down a stairway, and running. Five subjects participated the evaluation process which compare the video data with the measured data. As a result, the activity classification rate of 90.6% on average was obtained. Overall results showed that the steady-state activities could be classified from the low component of 3-axis acceleration signal and dynamic activities could be distinguished from frequency analysis using wavelet transform and FFT. Finally, we could find that this system can be applied to acquire and analyze the static and dynamic physical activity data.

• Journal of IKEEE
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• v.19 no.1
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• pp.52-57
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• 2015

The disease diagnosis system has been developed using the thin nitride(Si3N4) cantilever arrays which can measure the difference of capacitances between sensor and reference. The system consists of 32-bits RISC(Reduced Instruction Set Computer), RAM/Flash, bus, communication IP's, ADC(Analog Digital Converter) board, and LCD display. The marker selection method, which give us the good accuracy from reasonal numbers of markers, is suggested. The developed system has the resolution under 1fF and can detect 10nM concentration of Thrombin.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.193-197
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• 2002

In this study, the casting/forging process was applied to the Shift-Fork, a manual transmission part of automobiles. In the casting experiments, the effects of additives, Sr, Ti＋B and Mg, on the mechanical properties and the microstructure of a cast preform were investigated. When 0.03% Sr were added into the molten aluminum alloy, the finest silicon-structure was observed in the cast preform and the highest tensile strength and elongation accomplished. And when 0.2% Ti＋B were added into the molten Al-Si alloy, the highest values of tensile strength were obtained. The maximum hardness was in case of 0.2% Mg. In the forging experiment, it was confirmed that the optimal configuration of the cast preform could be predicted by FE analysis. To minimize the cost as the press size, the compact shape of preform was proposed to reduce the volume of flash. The modification of shape in designing preform was performed to attain a satisfactory performance in the areas where the mechanical strength were more required. By using FVM(Finite Volume Method) software, it was verified that a proposed casting design was available. To identify the relationship between effective strain and mechanical properties of the final forged product, the compression test was performed. As the result, the tensile strength and elongation of a cast preform were much higher than before forging. The minimum forging temperature was found 40$0^{\circ}C$ to save heating time.