• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.11C
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• pp.963-969
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• 2008

This paper presents 6bit 100MHz Interpolation Flash Analog-to-Digital Converter, which can be applied to the Receiver of Wireless Tele-communication System. The 6bit 100MHz Flash Analog-to-Digital Converter simplifies and integrates S-R latch which multiplies as the resolution increases. Whereas the conventional NAND based S-R latch needed eight MOS transistors, this Converter was designed with only six, which makes the Dynamic Power Dissipation of the A/D Converter reduced up to 12.5%. The designed A/D Converter went through $0.18{\mu}m$ CMOS n-well 1-poly 6-metal process to be a final product, and the final product has shown 282mW of power dissipation with 1.8V of Supply Voltage, 100MHz of conversion rate. And 35.027dBc, 31.253dB SFDR and 4.8bits, 4.2bits ENOB with 12.5MHz, 50MHz of each input frequency.

• Journal of Satellite, Information and Communications
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• v.8 no.2
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• pp.12-16
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• 2013

In this paper, we proceeded a study about the mobile software applications using smartphone technology. Firstly, we proposed a communication which a position data transmission technique using LED flashlight with built-in smartphone and we develop the application to perform a remote controller for beam-forming communication based on visible light associated with the position of Smartphone user. OOK modulation was applied for transmitting location data via LED backlight flash of smartphone and PD is used for detecting receiving light. In case of remote controller application which was controlled by WiFi IP-networking and it controls LED direction for beam-forming communication. These suggestion can be a good example for ubiquitous position recognition system using smart phone and software.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.1
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• pp.81-87
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• 2021

In this study the skin care system was designed and tested by introducing V-IPL(Variable-Intense Pulse Light) methods that allow various skin treatments. The discharge method, a new method of switching on the flash lamp sequentially according to the lesions, was used. Pulse shape control is implemented in the system using the conventional LC variable method and the switching method control method of the switching element. As a result, the pulse width could be varied up to 1[㎛] by using a microprocessor, and by turning on the flash lamp sequentially along the lesions the depth and width, the pulse shape and pulse shape could be more diverse. We could also make long pulses of up to 1~100[ms] in various pulse width. And the special differences between the existing system and the proposed system in this study are as follow. Existing system is one pulse(pulse width : 1~40ms) and proposed system is three pulse(pulse width : 1~100ms).

• Transactions of the Korean Society of Mechanical Engineers B
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• v.36 no.1
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• pp.17-24
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• 2012

There has been little study on the performance characteristics of the effective heat pump systems in the cooling mode using the two-stage compression cycles have hardly performed. In this study, the performance of the two-stage compression $CO_2$ cycle with an FI (flash intercooler) and the FGB (flash gas bypass) was investigated by using a theoretical method. The performance analysis was carried out with aby varyingiation (the indoor temperature, outdoor temperature, and 1st- and 2nd-stage EEV openings. As of a result, the coefficients of performance (COPs) of the Bbasic, FI, and FGB cycles were decreased by 28.5%, 22.1%, and 24.5%, respectively, for various outdoor temperature conditions. In addition to, the performance variation of the two-stage compression cycle was smaller than that of the single-stage compression cycle. The performance of the FI and FGB cycles was improved by 13.5%, and 6.9%, respectively, when the 1st-stage EEV opening was increased from 32% to 48%, and by 0.9%, and 2.6%, respectively, when the 1st- andthe 2nd-stage EEV opening was increased from 32% to 48%, andwas increased from 42% to 58%, respectively. The FI cycle showed anthe most improved performance for any given operating conditions.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.20 no.5
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• pp.1679-1688
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• 1996

Laser flash technique was applied to measure thermal properties of FGM made by a CVD method. System stability and reproducibility of this measuring system were proved and calibrated with glassy carbon used as reference material. Specimens was prepared by cutting FGM diagonally. Measurements were performed for a wide range of temperatures up to 1500K. Relative heat capacity of the FGM specimen was scattered with in $\pm$13% at room temperature and at high temperature above 1200K, and $\pm$3% at medium temperature range. On the other hand, thermal diffusivity data showed excellent reproducibility and stability through the whole temperature range. In conclusion, the multi-target radiometer can be applied to measure the thermal properties of non homogeneous materials like FGM.

• The Science & Technology
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• no.10 s.413
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• pp.112-113
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• 2003

고온 초전도 송전선 개발/ 세계 첫 2대 2 '교환 간이식'/ "대장암 · 위암 DNA진단칩 개발"/ 울릉도 '섬쑥부쟁이' 세계적 특산식물 확인/ 대학ITRC(IT연구센터) 11곳 지정/ 대구과학축제 개최/ 제1회 전국대학생 물사랑 플래쉬 애니메이션 공모

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.389-390
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• 2009

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.678-681
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• 2003

In this paper, we aims to develop a microcontroll er-based portable pulse oximeter using Compact Flash Interface. First, portable pulse oxineter system is designed to record 2 channel of biosignals simultaneously, including 1 channel of SpO$_2$ and 1 channel of pulse rate. It is very small and portable. Besides, the system makes it possible to measure a patients condition without an additional medical equipment. We tried to solve the problems generated by a patient's motion. That is, we added an analog circuit to a traditional pulse oximeter in order to eliminate the change of the base line. And we used 2D sector algorithm. As present, SpO$_2$ modules are completed. But there are still many further development needed in order to enhance the function. Especially, compact flash interface remains the most to complete. Second, ECG monitoring system uses almost same as present 3-lead ECG system. But we focus on the analog part, especially in filter. The proposed filter is composed of two parts. One is a filter to remove the power-line interface. The other is a filter to remove the baseline drift. A filter to remove the power-line and the baseline drift is necessarily used in the ECG system. The implemented filter have three features; minimizing the distortion in DC component, removing the harmonic component of power-line frequency. Using compact flash interface, we can easily transfer a patient's personal information and the measured signal data to a network based server environment. That means, it is possible to implement a patient's monitoring system with low cost.

• Journal of Engineering Education Research
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• v.6 no.2
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• pp.30-37
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• 2003

This paper presents web-based contents for studying electrical machines using Java Bean and Flash. The component-based software development techniques have been used to develop Java Bean and Flash components which are simple and convenient for learners. The components have been used to make 61 contents for the electrical machines. The contents have highly interactive capability, which gives much interest to learners. The learners can easily understand the electro-mechanical concept by changing the parameters interactively. The class load of the lecture can be reduced because the basic explanation of the subject is replaced by the web contents. The better quality of the class is expected by dealing with the higher concept in the classroom lecture because the basic concepts are explained through the contents.

• KIPS Transactions on Computer and Communication Systems
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• v.5 no.1
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• pp.1-6
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• 2016

This paper focuses on algorithm innovation of NAND Flash Memory for enhancing cell lifetime. During flash memory read/write/erase, the voltage of a specific cell should be a valid voltage level. If not, we cannot read the data correctly. This type of interference/disturbance tends to be serious when program and erase operation will go on. This is because FN tunneling results in tunnel oxide damage due to increased trap site on repetitive high biased state. In order to resolve this problem, we make the cell degradation by reducing the amount of stress in terms of erase cell, resulting in minimizing the cell disturbance on erase verify.