Optimal time allocation for two-way relay channel using physical-layer network coding

Park, Hyuncheol,Cho, Dae-Soon,Shim, Yeonggyu Institution of Electrical Engineers 2014 IET COMMUNICATIONS Vol.8 No.14

In Situ Monitoring of Individual Plasmonic Nanoparticles Resolves Multistep Nanoscale Sulfidation Reactions Hidden by Ensemble Average

Park, Youngchan,Oh, Hyuncheol,Park, Jiseong,Choi, Woong,Ryu, Hyein,Seo, Daeha,Song, Hyunjoon American Chemical Society 2019 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.123 No.37

<P>The generation of complex nanostructures to obtain novel characteristics and improved performance has been achieved by coupling multiple nanoscale reactions. Because reactions at the nanometer scale directly govern the morphology of nanostructures, understanding the reaction mechanism is critical to precisely control the morphology and, eventually, the physicochemical properties of the materials. However, because of the ensemble-average effect, investigating the reaction mechanism at the bulk level does not provide sufficient information. In this study, we investigated the overall sulfidation reaction mechanism that occurred on individual silver nanocubes in real time at high temperature. Using the single-particle dark-field imaging technique, three discrete steps of the sulfidation reaction were clearly resolved in the profiles of the plasmon peak shift and the intensity change of individual particles according to time progress: (I) reactant diffusion to the silver surface by passing through a ligand barrier, (II) silver sulfide formation by C-S bond cleavage of cysteine molecules, and (III) diffusion of silver atoms in the silver sulfide layer until the complete formation of silver sulfide. By a combination of simulation and control experiments, physical constants were derived for each step, which is completely hidden in the ensemble measurements. Each individual nanoparticle exhibited a large variation of physical values, such as the reaction rate constant and diffusivity, mainly resulting from the intrinsic structural heterogeneity. Dark-field microscopy image processing based on surface plasmon scattering would be helpful to analyze the reaction kinetics and understand the reaction mechanisms of the numerous multistep nanoscale reactions in real time with high spatial and temporal resolutions under actual reaction conditions.</P> [FIG OMISSION]</BR>

가치기반 접근법을 통한 테스트 케이스 우선순위기법

박현철(Hyuncheol Park),류호연(Hoyeon Ryu),백종문(Jongmoon Baik) 한국정보과학회 2009 정보과학회논문지 : 소프트웨어 및 응용 Vol.36 No.5

한번 개발된 소프트웨어는 긴 수명을 가지며, 결함이나 사용자 요구사항의 변경, 환경의 변화 등의 원인으로 인한 수많은 모듈의 수정을 통해 진화한다. 소프트웨어의 진화와 더불어, 이러한 많은 모듈의 추가와 수정에 의한 소프트웨어의 다양한 버전의 생성은 소프트웨어 품질 향상을 가로막는 주요 요인중의 하나이다. 한편 회귀테스트는 이러한 소프트웨어의 변경에 따른 초점을 둔 테스트이지만, 소프트웨어가 여러 버전을 거쳐 진화함에 따라 많은 수의 테스트 케이스의 추가 및 수정과 더불어 테스트 케이스의 전체 숫자가 급격히 증가함에 따라 비용이 많이 들기에 쉽게 수행하지 못하는 테스트이다. 이에 테스트케이스 우선순위화 기법이 등장하여 회귀테스트의 수행을 지원하였다. 그러나, 테스트 케이스 우선순위화기법에서 사용되는 우선순위의 기준이 가치중립적이거나 가치를 고려하더라도 특정한 단일 요인만을 고려하여 그 활용이 제한적이었다. 논문에서, 우리는 비용과 결함 심각도에 기반한 히스토리컬 가치 기반의 접근법을 제시하며, 이는 기존의 비용 인식 테스트 케이스 우선순위화 기법에서의 현재의 비용 및 결함 심각도를 예측하기 위하여 히스토리컬 정보를 사용하는 접근법이다. 본 논문의 공헌으로서, 제안된 접근법은 테스트의 이해관계자들이 어떻게 히스토리컬 가치가 가치의 관점에서 테스트 효과성의 향상을 위해 사용되고 있는가를 알 수 있도록 돕는다는데 있다. 결과적으로, 회귀 테스트를 수행하는 소프트웨어 테스터들은 그들의 테스트 케이스를 보다 더 효과적으로 우선순위화할 수 있기에 그들의 테스트를 통한 테스트 효과성은 향상될 수 있다. Software, once developed, has a long life and evolves through numerous additions and modifications because of the faults, the changes in user requirements, the changes in environments, and so forth. With the evolution of the software, assuring the quality of the software is getting more difficult because of numerous versions of the software. Meanwhile, regression testing has been used to support the software testing activities and assure acquiring appropriate quality through several versions of software. Regression testing, however, is too expensive because it requires lots of test cases executions and the number of test cases increases sharply as the software evolves. For this reason, several techniques are suggested to help conducting regression testing then test case prioritization technique is understood the most effective and efficient technique to support regression testing. In this paper, we propose an approach, Historical Value-Based Approach, which is based on the use of historical information to estimate the current cost and fault severity for cost-cognizant test case prioritization. As a result of the proposed approach, software testers who perform regression testing prioritize their test cases more effectively so that the test effectiveness of them can be improved in terms of APFDc.

ARRIEL엔진 가속임무시험 설비 개발

구현철(Hyuncheol Koo),김성국(Seongkook Kim),박수열(Sooyoul Park),김정호(Jeongho Kim),박성호(Sungho Park),이광해(Kwanghae Lee) 한국항공우주학회 2019 한국항공우주학회 학술발표회 논문집 Vol.2019 No.11

A NEW I/Q IMBALANCE COMPENSATION SCHEME FOR OFDM SYSTEM

Jonghun Park,Yusung Lee,Hyuncheol Park 대한전자공학회 2006 ITC-CSCC :International Technical Conference on Ci Vol.2006 No.3

The CO gas sensing properties of direct-patternable SnO₂ films containing graphene or Ag nanoparticles

Kim, Hyuncheol,Park, Chang-Sun,Kang, Kyung-Mun,Hong, Min-Hee,Choi, Yong-June,Park, Hyung-Ho The Royal Society of Chemistry 2015 NEW JOURNAL OF CHEMISTRY Vol.39 No.3

<P>The gas sensing properties of direct-patternable SnO<SUB>2</SUB> thin films prepared by photochemical solution deposition were improved by an incorporation of graphene or Ag nanoparticles. The CO gas sensitivity of the SnO<SUB>2</SUB> thin film was 3.65, but increased to 6.84 and 18.06 by the incorporation of graphene and Ag nanoparticles, respectively. Direct-patterning of graphene or Ag nanoparticles incorporated SnO<SUB>2</SUB> thin films can be performed at the 40 μm scale pattern without a photoresist or an etching process.</P> <P>Graphic Abstract</P><P>The CO gas sensing properties of direct-patternable SnO<SUB>2</SUB> composite thin films were more effectively improved by the incorporation of Ag nanoparticles than graphene. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj01978d'> </P>

정량적 식스 시그마 프로젝트 관리를 위한 프레임워크와 도구

박현철(Hyuncheol Park),류호연(Hoyeon Ryu),백종문(Jongmoon Baik) 한국정보과학회 2008 정보과학회논문지 : 소프트웨어 및 응용 Vol.35 No.4

식스 시그마는 80년대 중반에 처음 등장한 이래 각종 제조업, 금융이나 공공기관 같은 서비스업 등의 다양한 산업 분야에서 활용되어 오면서 무수한 성공사례를 통해 그 능력과 가치를 입증해 온 품질 혁신 활동이다. 최근에는 소프트웨어 개발 및 품질 보증에서도 식스 시그마를 활용하기 위한 연구가 활발히 이루어지고 있다. 그러나 식스 시그마의 활발한 도입 및 활용에도 불구하고 식스 시그마 프로젝트의 수행을 지원하는 소프트웨어 도구는 많지 않다. 이러한 이유로 정량적인 식스 시그마 프로젝트 관리에 대한 필요성이 제기되게 되었고, 식스 시그마 프로젝트의 전체 프로세스에 걸친 통합적인 식스 시그마 프로젝트에 대한 측정 및 분석, 측정 및 분석결과에 대한 저장 및 리포팅 기능을 지원하는 프레임워크나 도구가 필요하다. 본 논문에서는 이러한 기능들을 지원하는 정량적인 식스 시그마 프로젝트 관리 프레임워크를 제안하고, 이 프레임워크에 기반하여 개발이 진행 중인 식스 시그마 프로젝트 지원도구에 대해 소개한다. 이를 통해 식스 시그마 프로젝트를 수행하는 조직이나 사용자는 정량적인 프레임워크와 도구의 사용에 바탕을 둔 식스 시그마 프로젝트의 관리를 통해 식스 시그마 프로젝트의 정량화, 체계화, 통합화라는 이득을 얻을 수 있을 것이다. Since the advent of Six Sigma in 1980’s, Six Sigma is widely used in various industry areas, such as manufacturing, financial, government, and service, and proves its innovation ability and value by providing lots of success stories. Several researches have been conducted to adopt Six Sigma for Software Development and Software Quality Assurance-Software Six Sigma. Although the wide use of Six Sigma, there is no software tool to support the execution of Six Sigma Project. For this reason, the Quantitative Six Sigma Project Management is required to support for measuring and analyzing Six Sigma Projects, storing and reporting the results from Six Sigma Projects, and managing Six Sigma Projects through the whole process of , DMAIC or DMADV. In this paper, we introduce the design and implementation of a Quantitative Six Sigma Project Management Framework and Tool. The execution of Six Sigma Project based on Six Sigma Project Management Tool benefits the quantification, the systematization, and the integration.

사상체질에 따른 성격강점 차이연구

박현철 ( Hyuncheol Park ),유경 ( Gyung Yu ),김락형 ( Lakhyung Kim ) 대한한방신경정신과학회 2017 동의신경정신과학회지 Vol.28 No.1

Objectives: The purpose of this study is to investigate the Sasang Constitution character strength of university students. Methods: One hundred fifty students of Woosuk University participated in this study. Their majors were Korean medicine, nursing science, and pharmacy. Their Sasang Constitutional types were determined using the results of a Two Step Questionnaire for Sasang Constitution Diagnosis (TS-QSCD). The subjects were also tested by a Characteristic Strength Test (CST). The Character Strength test scores were compared to the different Sasang Constitutions using analysis of variances (ANOVA). Also, the five Signature Strengths presented to the subjects were measured as a percentage within Sasang Constitution Groups, and compared to the different Sasang Constitutions. Results and Conclusions: 1. In CST score: Soyangin were significantly higher than Taeeumin in creativity, curiosity, love, social intelligence, vitality, leadership, appreciation of beauty and excellence, and humor. Also, Soyangin was significantly higher than Soeumin in wisdom, kindness, bravery, and authenticity. 2. In CST score: Taeeumin were significantly higher than Soyangin in modesty. Taeeumin and Soeumin were significantly higher than Soyangin in prudence. 3. In the five signature strength analysis: Extrovert character strengths such as curiosity, vitality, social intelligence, bravery, and leadership, were higher in Soyangin. On the other hand, Introvert character strengths such as modesty, prudence, and self-regulation, were higher in Taeeumin and Soeumin. 4. In the five signature strength analysis: The signature strengths of Soyangin and Soeumin indicated a biased distribution. The signature strengths of Taeeumin indicated an even distribution.

Development of an Ophtalmic Formulation for the Treatment of Glaucoma using the Acrylated Chitosan Coating Nanoparticle

DaeIn PARK,Suhyeon PARK,Hyuncheol KIM 한국생물공학회 2018 한국생물공학회 학술대회 Vol.2018 No.4

정량적 식스 시그마 프로젝트 관리를 위한 프레임워크 및 도구 개발

박현철(Hyuncheol Park),류호연(Hoyeon Ryu),백종문(Jongmoon Baik) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.1A