• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.5
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• pp.592-597
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• 2012

In this paper, a new small chip antenna for Wi-Fi application of the mobile handset is proposed. To miniaturize the chip antenna, the proposed antenna is designed to have the backside ground. The proposed antenna has S-shaped structure, which is designed on the LCP(Liquid Crystal Polymer) with ${\varepsilon}_r$=3.5. The size of the proposed antenna is $6.0mm{\times}2.5mm{\times}1.2mm$. The measured impedance bandwidth under a voltage standing wave ratio (VSWR) of 2 was 300 MHz(fractional bandwidth: 12.2 % 2.3~2.6 GHz), and peak gain is 1.42 dBi. The proposed antenna was designed using CST Microwave Studio commercial software tool. And the fabricated antenna is measured using a network analyzer and in anechoic chamber.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10a
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• pp.28-32
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• 2006

최근 연구결과에 의하면 심장질환을 포함한 심혈관질환은 성별에 관계없이 미국 및 전 세계적으로 질병사망의 주요 원인으로 조사되었다. 본 연구에서는 보다 효율적으로 진단하기 위해 진단의사 결정 보조시스템에 대해서 다룬다. 개발된 시스템은 혈청 내의 특정 단백질의 상대적 양을 측정할 수 있는 바이오칩인 압타머칩을 이용해 생성한 환자들의 칩 데이터를 Support Vector Machine, Neural Network, Decision Tree, Bayesian Network 등의 총 4가지 기계학습 알고리즘으로 분석하여 질환단계를 예측하고 진단을 위한 보조정보를 제공한다. 논문에서는 총 135개 샘플로 구성된 3K 압타머칩 데이터에 대해 측정된 초기 시스템의 질환단계 분류성능을 제시하고 보다 유용한 진단의사결정 보조 시스템을 구성하기 위한 요소들에 대해서 논의한다.

• KIPS Transactions on Computer and Communication Systems
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• v.8 no.11
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• pp.251-262
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• 2019

In this paper, we propose a simulator that provides various algorithms of RBF networks on neuromorphic chips. To develop algorithms based on neuromorphic chips, the disadvantages of using simulators are that it is difficult to test various types of algorithms, although time is fast. This proposed simulator can simulate four times more types of network architecture than existing simulators, and it provides an additional a two-layer structure algorithm in particular, unlike RBF networks provided by existing simulators. This two-layer architecture algorithm is configured to be utilized for multiple input data and compared to the existing RBF for performance analysis and validation of utilization. The analysis showed that the two-layer structure algorithm was more accurate than the existing RBF networks.

• Journal of the Korean Wood Science and Technology
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• v.38 no.3
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• pp.165-169
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• 2010

The cityward tendency of the population caused the building crowd and the skyscrapers, and destroyed the cityscape and ecosystem of the city. For this reason, many researchers studied to make more green spaces in the city. The roof greening is one of the methods to get the green spaces in the city. There are some problems in this method such as the safety load, growth of the plants on the artificial foundation, and so on. In this study, we evaluated the waste woodchips and the waste papers as a new materials for the artificial foundation. The new artificial foundation was made of the waste woodchips and the waste papers with the different ratio of mixture (woodchips, paper slurry, and fertilizer). The artificial foundation was applied to the planting of three different plants (creeping bentgrass, barley, and wheat). It was found that the growth of the plants with 1% of fertilizer was higher than other conditions. The best making condition of foundation was 40% pulp and 60% woodchips in the germination of all plants.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.307-310
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• 2001

In this paper we describe the design and implementation of uplink receiver for BWLL base station modem. The demodulator consists of digital down converter, matched filter and synchronization circuits. For symbol timing recovery we use Gardner algorithm. And we use forth power method and decision directed method for carrier frequency recovery and phase recovery, respectively. For the sake of performance analysis, we compare simulation results with the board implemented by FPGA which is APEX20KE series chip for Alter. The performance results show it works quite well up to the condition that a frequency offset equal to 4.7% of symbol rate.1

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.12
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• pp.2199-2204
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• 2007

The objective of this study is to get an implication through the application of Technology Acceptance Model (TAM) focused on Mobile Banking Service based on IC Chip. Thus firstly, this study reviewed the related literatures and materials. After this, this parer analyzed this TAM model with covariance structural method to search the factors influencing technology acceptance of Mobile banking service. In conclusion, the proposed model showed that 'innovation factor' influenced 'perceived usefulness' and 'user's acquaintance' influenced 'perceived ease of use'. And this 'perceived usefulness' influenced 'perceived ease of use' and this 'perceived ease of use' influence 'attitude toward use'.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.586-588
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• 2004

최근 DNA 관련 기술의 개발이 활발하게 이루어지고 있고, 그에 따라 DNA를 개인인식에 사용마고자 하는 시도가 실시간 이용가능성이 높은 DNA 칩 기술과 합쳐져 매우 중요한 이슈로 떠오르고 있다. DNA를 분석하기 위해서는 생물학적 실험이 필수적으로 따르게 되는데 이러한 실험 결과를 인식에 적용하기 위해서는 적절한 전처리가 필요하다. 본 논문에서는 여러 장점들로 인해 최근 DNA분석 기술로 주목받고 있는 모세관 전기영동법을 사용하여 DNA를 분석하고, 그 분석물을 개인인식을 위해 genotyping하는 과정에서 전처리가 요구되는 각 경우들에 대해 논하고 적절한 필터링 기법들을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.1167-1168
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• 2023

차량용 반도체 수요의 증가로 자율 주행 및 전장제품에 시스템 반도체 수요가 증가하고 있다. 차량용 반도체는 기존 AP 같은 칩보다 더 높은 내구성과 신뢰성이 요구되기 때문에 불량 분석이 중요하다. 이러한 환경에서 반도체의 안정적인 생산과 품질 보장을 위해서는 불량 검출과 불량 원인 분석이 중요하다. 본 논문은 기본적인 비파괴 불량 분석 방법에 대하여 조사하고 장단점을 탐구한다. 이를 통해 반도체의 안정적인 양산을 위한 기반 지식을 제공한다.

• Analytical Science and Technology
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• v.15 no.4
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• pp.381-387
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• 2002

In this study, we introduced experience participated in ELPAT (Environmental Lead for Proficiency Analytical Testing) program that is administered by the American Industrial Hygiene Association and EPA. The 126 sample results of total 128 samples met reference value, as a result accepted 'proficient'. The concentration of Pb in air, paint chips, soils and dust wipes are $0.0089{\sim}0.3956mg/m^3$, 0.0500~8.9149%, 29.0${\sim}$1697 mg/kg and $18.00{\sim}900.3{\mu}g/sample$, respectively. The lead in environmental matrix prepared adequate techniques and analysed by flame atomic absorption spectrometry. The lead in air was extracted hydrochloric acid, in paint chips and soils were digested with microwave and hotplate and in dust wipes were prepared microwave digestion. No differences of each preparation techniques was found and all methods were to be proper.

• Journal of KIISE:Computer Systems and Theory
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• v.35 no.11
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• pp.527-539
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• 2008

This paper presents a performance estimation technique based on queuing analysis for on-chip bus matrix architectures of Multi-Processor System-on-Chips(MPSoCs). Previous works relying on time-consuming simulation are not able to explore the vast design space to cope with increasing time-to-market pressure. The proposed technique gives accurate estimation results while achieving faster estimation time than cycle -accurate simulation by order of magnitude. We consider the followings for the modeling of practical memory subsystem: (1) the service time with the general distribution instead of the exponential distribution and (2) multiple-outstanding transactions to achieve high performance. The experimental results show that the proposed analysis technique has the accuracy of 94% on average and much shorter runtime ($10^5$ times faster at least) compared to simulation for the various examples: the synthetic traces and real-time application, 4-channel DVR.