• Title/Summary/Keyword: Re-sampling

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중금속 및 유류로 오염된 토질의 성토재료로서의 안정성에 관한 연구 (The Research on The Stability as Fill Material of Soil Defiled by Oil Element and Heavy Metals)

  • 이충숙;엄태규;최용규;이민희
    • 한국지반환경공학회 논문집
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    • 제5권2호
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    • pp.5-13
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    • 2004
  • 아파트 건설용 부지내에서 중금속 및 유류로 오염된 토사가 발견되었다. 7개 위치에서 대표적인 시료를 채취하였으며 이 오염된 토사의 지반공학적 안정성을 확인하기 위하여 중금속 및 유류에 대한 환경공학적 검토가 이루어졌다. 2개 위치의 토사는 유류로 심하게 오염되어 있어 현장의 특정지역으로 반출하여 폐기해야 하는 것으로 판단하였다. 토양오염우려수준인 1개 위치의 토사에 대하여 성토재로서의 활용가능성을 확인하기 위하여 성토 안정성에 대한 해석을 수행하였으며 성토재로 사용할 수 있는 것으로 판단하였다.

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프로스포츠 관람만족 및 관람몰입이 재관람의사에 미치는 영향 (Effect of Satisfaction and Absorption of Spectating on Desire of Re-Spectating at the Professional Sporting Events)

  • 김홍설
    • 한국콘텐츠학회논문지
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    • 제8권7호
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    • pp.216-223
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    • 2008
  • 본 연구는 프로스포츠 관람만족 및 관람몰입이 재관람의사에 미치는 영향을 규명하는데 주된 목적이 있었다. 이와 같은 연구 목적을 달성하기 위하여 본 연구는 2007년 대전광역시에서 개최된 프로 축구 및 프로야구 경기 직접 관람자를 모집단으로 설정한 다음 유층집락무선표집법(stratified cluster random sampling method)을 이용하여 표본을 추출하였으며, 최종 605명의 자료가 분석에 이용되었다. 본 연구에서 사용된 조사도구는 설문지였으며, 설문문항에 대한 신뢰도 검증결과 관람만족의 경우 .889, 관람몰입의 경우 .901, 재관람의사의 경우 .870로 나타남으로써 비교적 양호한 것으로 나타났다. 본 연구에서 사용된 통계기법은 상관분석(correlation), 회귀분석(regression)이었다. 이와 같은 연구방법을 통해 얻어진 결과를 종합하여 도출시킨 결론은 다음과 같다. 첫째, 관람만족은 재관람의사에 영향을 미친다. 둘째, 관람몰입은 재관람의사에 영향을 미친다.

남해 연안 멸치 난자치어 채집방법간 비교 (Comparison of Sampling Methods for Anchovy Eggs and Larvae in Coastal Waters of the South Sea of Korea)

  • 황선도;최일수;추은경
    • 한국어류학회지
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    • 제20권3호
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    • pp.228-232
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    • 2008
  • To investigate a proper sampling method for anchovy eggs and larvae in coastal waters of the South Sea, replicated samplings were made by different towing methods with different sampling gears and compared in terms of abundance and length composition. There was no significant difference in abundance in samples from vertical and oblique tows with a ring net. The abundance by replicated vertical tows with a ring net was not significantly different, but significant difference in abundance among sampling stations were found. The ring net sampled anchovy eggs in significantly greater numbers than collected by a NORPAC net, but both gears were not effective in obtaining quantitative samples of anchovy larvae larger than 3 mm. Therefore, samples by vertical tows with a ring net during the day at various stations is more efficient at estimating the density of anchovy eggs in an area compared to replicated sampling at a single station.

한국 대학생의 편의식품에 대한 가치 구조 평가에 대한 요인 분석 (A Factor Analysis on the Value System of Convenience Foods by Korean College Students)

  • 문수재;윤혜준;김정현;이양자
    • 한국식품조리과학회지
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    • 제15권4호
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    • pp.327-337
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    • 1999
  • This study was conducted on a sampling of 700 mixed college students from seven different schools nationwide by written questionnaire to evaluate the value system of convenience foods among Korean college students. Korean students put value on the following categories of convenience foods in order; convenience, taste, price, appearance, appliance to daily life, variety, locality, nutritional value, originality, improvement required, cleanliness and tradition. Significant differences between the sexes occurred in categories as cleanliness and convenience, since females considered convenience foods as convenient but not so clean (safe to eat). This study also conducted factor analysis on 24 individual convenient foods. Noodles laid emphasis on nutritional value; where refrigerated foods, ready to eat (RE) side dishes, on-the-spot kimbab, and sandwiches focused on cleanliness. Noodles. cereal, and instant soup focused on price. Frozen pizza, noodles, retort, RE meat, ham, fish cakes were dependent on locality and traditionality. Noodles, instant food, and packed kimchi scored highly on convenience. Frozen fried rice, retort, instant porridge, instant rice, RE meat, cereal, instant soup, and RE side dishes on consumption on a regular basis. Cereal, refrigerated foods, and RE side dishes laid emphasis on taste. Noodles, instant rice, cereal, ham, and RE side dishes focused on variety. Retort, RE meat, ramen, cereal, ham, and on the spot sandwiches looked to originality, while canned foods was recognized as ‘needing improvement’.

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The Influence of Customer Trust and Loyalty on Repurchase Intention of Domestic Tourism: A Case Study in Thailand During COVID-19 Crisis

  • LAPAROJKIT, Sumana;SUTTIPUN, Muttanachai
    • The Journal of Asian Finance, Economics and Business
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    • 제8권5호
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    • pp.961-969
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    • 2021
  • The study aimed to investigate the level of customer trust, loyalty, and re-purchase intention of coastal tourism in Thailand during the COVID-19 crisis; to test the different levels of customer trust, loyalty, and re-purchase intention by local tourists between East-side and West-side coasts of Thailand; and to examine the influence of customer trust and loyalty on re-purchase intention in coastal tourism. Using multistage sampling, this study sampled 487 Thai local tourists who had experienced coastal tourism in Thailand during the COVID-19 crisis. A questionnaire, descriptive analysis, independent sample t-test, correlation matrix, and multiple regression analysis were used to collect and analyze the data. All customer trust, loyalty, and re-purchase intentions in coastal tourism by local tourists were at a high level. There were significantly different levels of customer trust, loyalty, and re-purchase intentions by local Thai tourists between the East-side and West-side coasts of Thailand. Moreover, the study found that there was a significant positive influence of customer trust and loyalty on re-purchase intentions in coastal tourism by local tourists in Thailand during the COVID-19 crisis. This study indicates that Thai tourism industry still must develop and improve its local customer loyalty and trust because these positively influence customer re-purchase intentions.

공정평균 이동을 탐지하기 위한 적응 합성 관리도 (An Adaptive Synthetic Control Chart for Detecting Shifts in the Process Mean)

  • 임태진
    • 품질경영학회지
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    • 제32권4호
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    • pp.169-183
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    • 2004
  • The synthetic control chart (SCC) proposed by Wu and Spedding (2000) is to detect shifts in the process mean. The performance was re-evaluated by Davis and Woodall (2002), and the steady-state average run length (ARL) performance was shown to be inferior to cumulative sum (CUSUM) or exponentially weighted moving average (EWMA) chart This paper proposes a simple adaptive scheme to improve the performance of the synthetic control chart. That is, once a non-conforming (NC) sample occurs, we investigate the next L-consecutive samples with larger sample sizes and shorter sampling intervals. We employ a Markov chain model to derive the ARL and the average time to s19na1 (ATS). We also propose a statistical design procedure for determining decision variables. Comprehensive comparative study shows that the proposed control chart is uniformly superior to the original SCC or double sampling (DS) Χ chart and comparable to the EWMA chart in ATS performance.

CRS 기술수용과 재이용의도의 구조적 관계분석 (An Analysis on Structural Relationship between CRS Technology Acceptance and Reuse Intention - Targeting Employees for Domestic Airlines -)

  • 이선미;황희중
    • 한국항공운항학회지
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    • 제19권2호
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    • pp.29-30
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    • 2011
  • The purpose of this study is to closely examine relationship of the system re-use intention depending on CRS technology acceptance. Accordingly, questionnaire was widely distributed to 160 CRS users by convenient sampling targeting people in charge of task among employees for airlines and travel agencies, who are working-level staffs for CRS. Among these things, totally 142 valid materials were used in analysis. The analytical data processing was utilized SPSSWIN VER 18.0 and AMOS 18.0. The findings can be summarized as follows. Influential variables in CRS technology acceptance had significant influence upon the perceived ease use, the perceived usability, and the re-use intention. Also, the significant positive(+) influence was revealed to be had upon the perceived usability by the perceived ease use and upon the re-use intention by the perceived usability and ease use.

비터비 복호기를 이용한 OFDM-WLAN의 채널등화 및 샘플링 클럭추적 (Viterbi Decoder-Aided Equalization and Sampling Clock Recovery for OFDM WLAN)

  • 김형우;임채현;한동석
    • 대한전자공학회논문지TC
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    • 제42권5호
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    • pp.13-22
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    • 2005
  • OFDM(orthogonal frequency division multiplexing) 변조를 이용한 WLAN(wireless local area network) 시스템은 고속 무선 데이터 통신을 위한 대표적 수단으로 전송률의 향상을 위해 활발히 연구되고 있다. 본 논문에서는 WLAN의 정확한 채널 등화와 샘플링 클럭 추적을 위하여 비터비 복호기 출력을 이용한 등화 및 샘플링 클럭 추적 알고리듬을 제안한다. 이 알고리듬은 파일럿 신호를 이용하여 대략의 클럭 주파수 복원과 채널등화를 수행한 후 비터비 복호기의 출력을 다시 부호화하여 등화 및 샘플링 클럭의 추적에 이용하는 알고리듬이다. 제안한 알고리듬의 우수성을 ETSI WLAN 채널 환경에서 컴퓨터 모의실험을 통하여 보였다.

Monitoring Benthic AIgal Communides:A Comparison of Targeted and Coefficient Sampling Methods

  • Edwards, Matthew S.;Tinker, Martin T.
    • ALGAE
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    • 제24권2호
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    • pp.111-120
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    • 2009
  • Choosing an appropriate sample unit is a fundamental decision in the design of ecological studies. While numer-ous methods have been developed to estimate organism abundance, they differ in cost, accuracy and precision.Using both field data and computer simulation modeling, we evaluated the costs and benefits associated with twomethods commonly used to sample benthic organisms in temperatc kelp forests. One of these methods, theTargeted Sampling method, relies on different sample units, each "targeted" for a specific species or group ofspecies while the other method relies on coefficients that represent ranges of bottom cover obtained from visual esti-mates within standardized sample units. Both the field data and the computer simulations suggest that both meth-ods yield remarkably similar estimates of organisnm abundance and among-site variability, although the Coefficientmethod slightly underestimates variability armong sample units when abundances are low. In contrast, the twomethods differ considerably in the effort needed to sample these communities; the Targeted Sampling requiresmore time and twice the persormel to complete. We conclude that the Coeffident Sampling metliod may be bettcrfor environmental monitoring programs where changes in mean abundance are of central conccm and resources arelimiting, but that the Targeted sampling methods may be better for ecological studies where quantitative reIation-ships among species and small-scale variability in abundance are of central concern.

우리나라 당뇨병의 역학적 규모와 당뇨병 관리현황 파악을 위한 표본설계의 평가 (An Evaluation of Sampling Design for Estimating an Epidemiologic Volume of Diabetes and for Assessing Present Status of Its Control in Korea)

  • 이지성;김재용;백세현;박이병;이준영
    • Journal of Preventive Medicine and Public Health
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    • 제42권2호
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    • pp.135-142
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    • 2009
  • Objectives : An appropriate sampling strategy for estimating an epidemiologic volume of diabetes has been evaluated through a simulation. Methods : We analyzed about 250 million medical insurance claims data submitted to the Health Insurance Review & Assessment Service with diabetes as principal or subsequent diagnoses, more than or equal to once per year, in 2003. The database was re-constructed to a 'patient-hospital profile' that had 3,676,164 cases, and then to a 'patient profile' that consisted of 2,412,082 observations. The patient profile data was then used to test the validity of a proposed sampling frame and methods of sampling to develop diabetic-related epidemiologic indices. Results : Simulation study showed that a use of a stratified two-stage cluster sampling design with a total sample size of 4,000 will provide an estimate of 57.04%(95% prediction range, 49.83 - 64.24%) for a treatment prescription rate of diabetes. The proposed sampling design consists, at first, stratifying the area of the nation into "metropolitan/city/county" and the types of hospital into "tertiary/secondary/primary/clinic" with a proportion of 5:10:10:75. Hospitals were then randomly selected within the strata as a primary sampling unit, followed by a random selection of patients within the hospitals as a secondly sampling unit. The difference between the estimate and the parameter value was projected to be less than 0.3%. Conclusions : The sampling scheme proposed will be applied to a subsequent nationwide field survey not only for estimating the epidemiologic volume of diabetes but also for assessing the present status of nationwide diabetes control.