• 한국의류산업학회지
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• 제22권6호
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• pp.789-802
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• 2020

This study analyzes the experiences of a color therapy program that uses color and fashion directing to influence the psychological characteristics of adolescents, such as emotional intelligence, self-efficacy, and color expression. The subjects of this study were 15 adolescents who participated in B-City Winter School (January 6-15, 2020). Pre- and post-tests for emotional intelligence and self-efficacy were conducted to confirm the effect of the color therapy program that indicated a significant difference at the p<.05 level. Statistical significance was confirmed through the GEE model for formal characteristics used in pre/post and fashion-directed color expression. Peter pre- and post-changes in vocabulary emergence were investigated with a Word Cloud analysis using R program 4.0.2 that extracted the lower and upper categories. The significance of this study is that by expressing both color expression and fashion direction together, a program was provided for adolescents to have richer emotional experiences and career-related experiences. This study examined changes within a short period of time in 15 subjects; consequently, a follow-up in-depth qualitative analysis of the program effect and a post-testing study on maintaining the long-term effect is expected to secure further validity and usefulness of the study results. In addition, new studies are expected to contribute to the development of differentiated fashion-related education programs.

• 한국전자파학회지:전자파기술
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• 제19권6호
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• pp.60-71
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• 2008

RFID 기술은 ISO/IEC 18000 표준문서에서 정의한 규격에 기반하여 기술 개발이 진행되고 있으며, USN 기술은 IEEE 802.15.4에 기반한 Zigbee 표준문서를 따르는 센서 노드를 중심으로 기술이 발전하고 있다. 이러한 기본적인 통신 기능과 더불어 RFID/USN 정보 보호를 위한 보안 기술 논의도 활발하게 전개되고 있으며, 그 결과로서 RFID/USN 보안 취약점, 보안 필요성 및 보안 요구사항 등에 대한 분석 자료들은 지속적으로 발표되고 있다. 그러나 요구사항 분석 자료와 달리 기술적인 해결 방안을 제시하는 자료들은 단편적인 기능에 중점을 둔 학술적인 이론 분석에 머무르고 있을 뿐 실제 상용화 수준의 개발 내용들을 제공하는 발표는 미흡한 실정이다. 따라서 본 고에서는 기본적인 보안 요구사항 정리 수준을 넘어보다 구체적인 RFID/USN 보안 기술의 개발 결과를 제시하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1406-1407
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• 2008

In this paper, a micro balanced filter in magnetically coupled LC resonators is proposed, designed, simulated by using FR-4 PCB substrate for low cost, small volume IEEE 802. 11a wireless LAN application. Two pair of coupled LC resonators using magnetic coupling of embedded inductors are applied to obtain bandpass transmission response and improve their phase and magnitude imbalance characteristics. In addition, high dielectric composite film is applied to fabricate the high Q MIM capacitors with small size and high capacitance density. It has an insertion loss of 1.4 dB, a return loss of 10 dB, a phase imbalance of 0.25 degree, and magnitude imbalance of 0.17 dB at frequency bandwidth of 200 MHz ranged from 5.15 GHz to 5.35 GHz, respectively. The proposed balanced filter has a small volume of $1.1mm{\times}1.3mm{\times}0.6mm$ (height).

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2012년도 하계학술대회
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• pp.333-336
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• 2012

본 논문은 2.4GHz 대역을 사용하는 WBAN(Wireless Body Area Network)환경에서 동일 채널을 사용하는 경우에 발생하는 간섭을 제거하기 위해 MMSE(Minimum Mean Square Error), OC(Optimal Combining), ML(Maximum Likelihood)을 비교 분석하였으며, IEEE 802.15.6에서 정의된 시나리오 및 채널 모델에 대해서 분석하였다. 모의실험 결과 ML 알고리즘이 가장 우수한 성능을 나타내는 것을 알 수 있었다. 하지만 ML과 OC의 경우 원하는 신호의 채널 정보뿐만 아니라 간섭채널의 정보를 알아야 하기 때문에 채널을 추정하기 위한 훈련 심볼의 자리를 수신노드에서 알고 있어야 하므로 WBAN환경에 적용하는데 어려움이 있다. 따라서 복잡도와 성능사이에 적당한 trade-off를 만족하는 간섭 제거 알고리즘을 연구해야 할 것이다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.429-431
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• 2013

In this paper, we propose a low-power hibernation technique (LHT) for WUSB over IEEE 802.15.6 hierarchical MAC to improve its energy efficiency. Simulation results show that the LHT also integrate WUSB transactions and WBAN traffic efficiently while it achieves high energy efficiency.

• Archives of Pharmacal Research
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• 제25권1호
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• pp.25-27
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• 2002

The crystal structure of KR-21042, N-(3-Phenylpropyl )-4-hydroxy-3-methoxyphenylacetamide, was determined by single crystal X-ray diffraction analysis. The compound was recrystallized from a mixture of ethylacetate and n-hexane in monoclinic, space group $P2_1/c$, with a = 16.622(1), b = 6.215(1), c = 15.802(1) ${\AA},{\;}{\beta}=104.97(1)$, and Z = 4 The calculated density is $1.261{\;}g/cm^3$The structure was solved by the direct method and refined by full matrix least-squares procedure to the fecal R value of 0.068 for 2332 observed reflections.

• ETRI Journal
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• 제37권6호
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• pp.1096-1107
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• 2015

This paper presents a dynamic retry adaptation scheme for H.264 HD video, called DRAS.264, which dynamically adjusts the retry limits of frames at the medium access control (MAC) layer according to the impact those frames have on the streamed H.264 HD video. DRAS.264 is further improved with a bandwidth estimation technique, better prediction of packet delays, and expanded results covering multi-slice video. Our study is performed using the Open Evaluation Framework for Video Over Networks as a simulation environment for various congestion scenarios. Results show improvements in average peak signal-to-noise ratios of up to 4.45 dB for DRAS.264 in comparison to the default MAC layer operation. Furthermore, the ability of DRAS.264 to prioritize data of H.264 bitstreams reduces error propagation during video playback, leading to noticeable visual improvements.

• Journal of Communications and Networks
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• 제15권6호
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• pp.606-613
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• 2013

This paper proposes a complete solution of a contention-based medium access control in wireless local networks to provide station level quality of service guarantees in both downstream and upstream directions. The solution, based on the mature distributed coordination function protocol, includes a new fixed contention window backoff scheme, a tuning procedure to derive the optimal parameters, a super mode to mitigate the downstream bottleneck at the access point, and a simple admission control algorithm. The proposed system guarantees that the probability of the delay bound violation is below a predefined threshold. In addition, high channel utilization can be achieved at the same time. The numerical results show that the system has advantages over the traditional binary exponential backoff scheme, including efficiency and easy configuration.

• 위성통신과 우주산업
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• 제15권1호
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• pp.101-107
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• 2008

IMT-Advanced 서비스는 지난 2007년 10월 WRC-07 회의에서 IMT-Advanced를 위한 새로운 주파수가 할당되고 IMT-Advanced 기술 개발 경쟁이 본격적으로 이루어지면서 차세대 이동통신의 주도권을 잡기 위한 표준화 경쟁도 시작되었다. IMT-Advanced 서비스 및 시스템의 표준화는 ITU가 중심이 되어 2009년 10월까지 후보 기술을 제안 받고 2011년 2월까지 이루어질 예정이다. 한편 3GPP, 2GPP2, IEEE802.16 등 기준 IMT-2000 표준 기술을 제안한 표준화 단체 중심으로 IMT-Advanced 표준 기술 개발 경쟁이 치열하게 전개되고 있다. 지난 2008년 1월에 합의하기로 한 최소 기술 요구사항은 각 표준화 단체를 배경으로 한 국가 및 제조업체사이에 표준화 기술의 의견 차이가 매우 커서 2008년 6월로 미루어졌다. IMT-Advanced 기술 요구 사항은 국내 IMT-Advanced 기술 경쟁력을 확보하는 기준이 되는 문서로서 최소 기술 요구사항의 파라미터 값은 향후 IMT-Advanced 시스템의 개발 및 상용화 시기 그리고 기존 IMT-Advanced 기술 요구 사항에 대한 표준화 단체의 기술 개발 현황과 차이를 확인하고 주요 이슈 및 쟁점을 분석하였다.

• Journal of Information Processing Systems
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• 제13권6호
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• pp.1602-1612
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• 2017

Since rapidly disseminating of Internet of Things (IoT) as the new communication paradigm, a number of studies for various applications is being carried out. Especially, interest in the smart medical system is rising. In the smart medical system, a number of medical devices are distributed in popular area such as station and medical center, and this high density of medical device distribution can cause serious performance degradation of communication, referred to as the coexistence problem. When coexistence problem occurs in smart medical system, reliable transmitting of patient's biological information may not be guaranteed and patient's life can be jeopardized. Therefore, coexistence problem in smart medical system should be resolved. In this paper, we propose a distributed coexistence mitigation scheme for IoT-based smart medical system which can dynamically avoid interference in coexistence situation and can guarantee reliable communication. To evaluate the performance of the proposed scheme, we perform extensive simulations by comparing with IEEE 802.15.4 MAC protocol which is a traditional low-power communication technology.