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- 저자 : 허정호(Jung-Ho Huh) (검색결과 135 건)
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적응형 패리티 그룹 구성을 이용한 RAID 5 제어기에서의 캐시 운영
허정호,송자영,장태무,Huh, Jung-Ho,Song, Ja-Young,Chang, Tae-Mu 한국정보처리학회 2003 정보처리학회논문지 A Vol.10 No.2
RAID 5는 고 신뢰도 및 고성능 디스크 시스템을 구성하는 널리 사용되는 기법이다. 본 논문은 특히 OLTP(On-Line Transaction Processing System) 작업환경에서 RAID 5의 소규모 쓰기("small write") 문제를 해결하기 위해 캐시 상에서 적응형 패리티 그룹(APGOC : Adaptive Parity Group On Cache) 구성을 제안한다 이 방법에서는 사용자 프로세스가 한 파일에 대한 접근을 커널에 요청할 때 파일 시스템의 파일 데이터 구조에 읽기/쓰기에 관련된 정보를 추가한다. 이 정보를 이용한 패리티 읽기를 통하여 데이터와 패리티 캐시를 연관 운영한다. 그리하여 캐시의 활용도를 높이고 디스크 요청에 대한 응답시간을 개선할 수 있다. 제안된 방법을 분석하고 시뮬레이션을 통하여 실험한 결과 기존의 방법에 비하여 6~l3% 정도의 성능 향상을 관찰할 수 있었다.관찰할 수 있었다. RAID 5 is a widely-used technique used to construct disk systems of high reliability and performance. This paper proposes APGOC (Adaptive Parity Group On Cache) organization on cache to solve "small write" problem of RAID 5 especially in OLTP (On-Line Transaction Processing System) environments. In our approach, when user process makes a request for a file to kernel, the information on the read/write characteristics is added to the file data structure of the file system. With this information, data and parity cache can be managed interchangeably through parity fetching. Therefore we can enhance the cache utilization and improve the disk request response time. Our method is analyzed and evaluated with a simulation method. Comparing with previous works, we observed about 6~l3% of performance enhancement.hancement.
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허정호(Jung-ho Huh),장태무(Tae-Mu Chang) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1A
RAID 시스템에서 디스크 캐시는 시스템 성능 향상에 중요한 요소 중 하나이다. 2단계 캐시는 1단계 캐시에 비해 우수한 성능을 보이고 시간적, 공간적 지역성에도 효율적이다. 제안된 캐시 시스템은 2 단계로 구성되어 1단계 캐시는 작은 블록 크기로 구성되어 세트 연관 사상 방식을 이용하고 2단계 캐시는 큰 블록 크기로 구성되어 전 연관 사상 방식을 사용한다. 본 논문에서는 특히 대용량 디스크 캐시에서 디스크 입출력 시간을 향상시키고 효율적으로 일관성을 유지할 수 있는 디스크 제어기 상에 위치하는 RAID5 디스크 캐시의 모델을 제시하여 적중률을 향상시켜 수행속도를 개선시키고자 한다.
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브랜드 인지도, 지각된 서비스 품질, 물리적 환경이 구매의도에 미치는 영향
허정호(Huh, Jung-Ho),우종필(Yu, Jong Pil) 한국소비문화학회 2013 소비문화연구 Vol.16 No.2
This study is to examine the effect of brand awareness and perceived service quality and physical environment on congruity and purchase intention in Korean coffee shop. This study also investigates how brand awareness and perceived service quality and physical environment play mediating roles between congruity and purchase intention on focusing on coffee shop. For these purposes, the author developed a structural model which consists of several constructs. In the model, brand awareness and perceived service quality and physical environment was proposed to affect the congruity and purchase intention focusing on coffee shop. The data were collected from 384 coffee shop customer in order to test convergent validity and discriminant validity of the measures of each construct. The results of factor analyses with reliability test with Cronbach's α warranted unidimensionality of the measures for each construct. In addition, nomological validity of the measures of each construct was warranted from the result of correlation analysis. The data were analyzed with reliablity analysis, path analysis and structural equation modeling with AMOS 18.0 and SPSS Win/PC 18.0. The result of the overall model analysis appeared as follow: χ²=130.591(df=18), p=.000, GFI=.946, AGFI=.802, CFI=.949, NFI=.942, IFI=.950, TLI=.844, RMSEA=.128. Since the result of the overall model analysis demonstrated a good fit, we could further analyze our data. The findings can be summarized as follows: Firstly, brand awareness had a positive effect on congruity. Secondly, perceived service quality had a positively effect on self-congruity, but had not a direct effect on functional congruity. Thirdly, physical environmental(attractiveness, environment, interior cleanliness, spatiality)had a positive effect on self-congruity, but physical environment on interior cleanliness factor had not a direct effect on functional congruity. Fourthly, self-congruity and functional congruity had not a direct effect on purchase intention. At the end of this paper, theoretical and managerial implications, limitations, and further research directions were suggested.
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공동주택의 표준건물 설정에 따른 에너지소비량 산정 및 특성분석
정해권(Jung, Hae-Kwon),정영선(Jeong, Young-Sun),허정호(Huh, Jung-Ho) 대한건축학회 2017 대한건축학회논문집 Vol.33 No.9
The purpose of the study was to set up reference buildings based on the apartments design status and the National Statistical data, and to calculate the energy consumption of the reference building by simulation program. In addition, the energy consumption of apartments including the energy consumption by appliances consumption behavior was calculated. We surveyed the design data of 174 apartments which were granted building permission from 2010 to 2014. The energy consumption of the reference building was divided into heating, hot water, lighting and was calculated using the ECO2 simulation program. Home appliances calculated energy consumption by heating, cooling, hot water, cooking, lighting, and white & brown goods. The results show that the total annual energy consumption of reference building is 18,266.8㎾h/y. The composition percentages are 58.4%(10,659.2㎾h/y) for heating, 16.5%(3,018.1㎾h/y) for hot water, 13.1%(2,397.6㎾h/y) for cooking, 7.2%(1,318.7㎾h/y) for lighting, 3.4%(622.4㎾h/y) for home appliances and 1.4%(250.8㎾h/y) for cooling. The annual energy consumption unit of the reference building was estimated as 214.93 ㎾h/㎡·y.
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슬라이스 가속 시험법에 따른 건축용 단열재의 성능 분석
최현중(Hyun Jung Choi),허정호(Jung Ho Huh),강재식(Jae-Sik Kang),최경석(Gyeong-Seok Choi),안호상(Hosang Ahn) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.2
Thermal property degradation of building insulation materials were analyzed by accelerated laboratory methods defined in ISO 11561 to verify thermal resistance change experimentally. Selected samples varied within one to three days from production date. Primary tests were executed for more than 3,000 hrs for XPS (Extruded PolyStyrene) and Rigid poly urethane, respectively. Secondary tests were carried out for approximately 1,500 hrs for special and first grade of XPS. Measured values of thermal resistance were analyzed to estimate the thermal resistance values of 25 year-time-lapse and to compare with 25 year-average value. It was observed that thermal property of special grade XPS was estimated to decrease after 25 years by 37 to 41% from the initial value. Grade 1 XPS showed relatively better results as of 21 to 27%. In addition, Rigid poly urethane 40K revealed property degradation pattern of 21 to 27% from the production stage.
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