• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.860-863
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• 2003

In this paper high power SMU(Source Measurement Unit) having 50V/1.5A source/measure range has been designed and implemented. The SMU has two operation mode, voltage mode and current mode. The SMU can be used as variable voltage source, variable current source, voltage meter, or current meter. Combining two different unit, output power can be doubled as 100V/1.5A. The developed SMU tan be used many semiconductor testing system and electronic device inspecting system.

• Journal of Life Science
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• v.33 no.7
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• pp.538-548
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• 2023

The research has been conducted on the isolation of antimicrobial compounds from plant natural extracts and their potential application in oral health care products. This study aimed to investigate the antimicrobial mechanism by analyzing the changes in gene expression of Streptococcus mutans, a major oral pathogen, in response to complex compounds extracted from Aralia continentalis and Arctii Semen using organic solvents. Transcriptome analysis (RNA-seq) revealed that both natural extracts commonly upregulated or downregulated the expression of various genes associated with different metabolic and physiological activities. Three genes (SMU_1584c, SMU_2133c, SMU_921), particularly SMU_921 (rcrR), known as a transcription activator of two sugar phosphotransferase systems (PTS) involved in sugar transport and biofilm formation, exhibited consistent high expression levels. Additionally, component analysis of the A. continentalis extract was performed to compare its effects on gene expression changes with the A. Semen extract, and two active compounds were identified through gas chromatography-mass spectrometry (GC-MS) analysis of the active fraction. The n-hexane fraction (ACEH) from the A. continentalis extract exhibited antibacterial specificity against S. mutans, leading to a significant reduction in the viable cell counts of Streptococcus sanguinis and Streptococcus gordonii among the tested multi-species bacterial communities. These findings suggest the broad-spectrum antibacterial activity of the A. continentalis extract and provide essential foundational data for the development of customized antimicrobial materials by elucidating the antibacterial mechanism of the identified active compounds.

• Proceedings of the Korea Society of Design Studies Conference
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• 2005.05a
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• pp.98-99
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• 2005

• Proceedings of the Korea Society of Design Studies Conference
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• 2005.05a
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• pp.104-105
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• 2005

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.37 no.5
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• pp.93-102
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• 2000

This paper describes the architecture and characteristics of the satellite modem unit (SMU) developed for the DAMA-SCPC Ground System(DGS), which is a Demand Assignment Multiple Access-Single Channel per Carrier (DAMA-SCPC) satellite network. There are several requirements for the SMU from the system architecture and design concept. To meet these requirements the SMU was designed and implemented by extensively applying digital signal processing (DSP) technique and field programmable gate array (FPGA). The developed SMU met the functional and performance requirements, and has been working well. The measured BER was about 1 $\times$10E-4 in continuous mode(at Eb/No=4.7, FEC=3/4).

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2003.06a
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• pp.234-237
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• 2003

본 논문은 이동 통신 및 IEEE 802.lla WLAN에서 사용하고 있는 컨벌루셔널 부호의 복호기인 비터비 복호기의 SMU(Survivor Metric Unit)의 최적 메모리 제어에 관한 연구이다. 비터비 복호기기 구조는 크게 BMU, ACSU, SMU부로 구성된다. 이때 SMU부는 최적의 경로를 역추적 하여 최종 복호 데이터를 출력해 주는 블록으로, 역추적 길이에 따라 메모리 사용 양과 복호 성능이 좌우된다. 따라서 본 논문에서는 최적 메모리 제어 알고리즘을 제안함으로써 복호 속도의 향상과 메모리 사용 양을 줄이는 방법을 제안한다. 제안 알고리즘의 성능을 검증하기 위해 기존의 비터비 복호기와 역추적 길이에 따른 비터비 복호기의 성능을 실험을 통해 분석함으로써 제안 방법의 객관적인 성능을 분석한다.

• Journal of IKEEE
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• v.25 no.2
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• pp.315-321
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• 2021

In this paper, we have developed the multiple channel measurement system for IC Socket Test. The one can test the current-voltage measurements for pitting the several device specification, which analyze the thin current from several ㎂ to 5A with very low resistor mΩ. The increasement of the IC socket channel with lead pitch under 0.25 mm be need to perform several functions, concurrently. The system to perform these functions be designed to integrate several SMU(source measure unit) on board. So, we can reduce the 2 minutes test time per channel point to 40 sec, with daisy chain test method. Using by graphic interface, I-V curve mode and data logging technologies, we can implement the test flow methods and can make economies the time and cost.

• Proceedings of the Korea Society of Design Studies Conference
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• 2004.10a
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• pp.12-13
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• 2004

• Proceedings of the Korea Society of Design Studies Conference
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• 2005.10a
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• pp.222-223
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• 2005

• Proceedings of the Korea Society of Design Studies Conference
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• 2005.10a
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• pp.166-167
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• 2005