• Communications for Statistical Applications and Methods
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• v.4 no.1
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• pp.75-90
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• 1997

본 연구는 범주형자료의 오분류에 관한 연구로, 2$\times$2분할표의 자료에 오분류가 있다고 생각되는 조사와 반복조사를 통해 정확하게 분류한 새로운 범주형자료를 시간이라는 새변수의 결합을 통해 오분류 여부를 탐색하는 방법에 대한 연구이다.

• The Korean Journal of Applied Statistics
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• v.32 no.4
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• pp.643-652
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• 2019

We propose a method for sample size determination using design effect formulas when a sample is resigned for a repeated survey. The proposed method enables the determination of the sample size by incorporating the impact of various design components to the sampling error through design effect formulas that are applicable under multistage sampling design and stratified multistage sampling designs.

• Journal of Food Hygiene and Safety
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• v.30 no.1
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• pp.92-97
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• 2015

The aim of this study is to examine the removal efficiency of pathogen (Escherichia coli O157:H7 and Salmonella typhimurium) on meat and fish products (packing condition: vacuum or not and storage temperature: $4^{\circ}C$ or $-20^{\circ}C$) repeatedly exposed at low-dose gamma irradiation. In case of meat products (beef and chicken), E. coli O157:H7 was not observed at the level of 2 kGy single gamma irradiation and 0.5 kGy repeated gamma irradiation and S. Typhimurium was not observed at the level of 2 kGy single gamma irradiation and 1 kGy repeated gamma irradiation. In case of fish products, E. coli O157:H7 and S. Typhimurium were not detected at the level of 0.5 kGy single and repeated gamma irradiation. These results showed that microorganisms on fish products were more efficiently removed than those of meat products with low-dose gamma irradiation. Generally, each packing condition made no difference. However, the products (fish and meat) stored at $-20^{\circ}C$ needed more higher dose gamma irradiation than products at $4^{\circ}C$.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.236-243
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• 2003

본 연구의 목적은 수작업 반복성 평가의 체계적인 연구를 위해 최근 5년간의 반복성에 관한 기존 연구 30여 편을 중심으로 반복성 평가 방법들을 조사하여 비교 분석하는 것이다 기존연구들의 비교 분석 결과, 평가하고자 타는 반복성의 근본적인 이해가 부족하여 반복성 정의에 대만 일관성이 없을 뿐만 아니라 반복 수준의 구분 기준에 대한 척도간 비교가 어렵고 결과의 일관성도 없었다. 본 연구에서는 기존 연구들의 무분별만 평가로 인한 문제점을 해결하기 위하여 시간(time)과 빈도수(frequence)를 기준으로 타는 평가 적도의 새로운 분류 체계를 제안하였다. 마지막으로 평가 적도의 측정과 분서에 사용되는 방법들을 조사하여 정리하였다. 본 연구의 결과는 수작업의 반복성 평가를 위한 척도의 사용지침을 제공할 뿐 아니라 추후 반복성 평가의 체계적인 방법론을 구축하는데 근간이 될 수 있을 것이다.

• Proceedings of the KSCN Conference
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• 2003.05a
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• pp.128-128
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• 2003

서울지역의 건강한 중년 자원자 91명(남 42명, 여 49명)을 대상으로 24시간 회상법을 이용한 3일간의 식품 및 영양소 섭취실태조사와 1년간의 식품섭취빈도조사를 6개월 간격으로 조사하였다. 1차 조사는 대상자가 작성해 온 조사지를 훈련된 영양사와의 면담을 통하여 수정, 보충하였으며, 2차 조사는 6개월 후 대상자가 직접 기록하여 우편을 통하여 접수하였다. (중략)

• The Korean Journal of Applied Statistics
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• v.15 no.1
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• pp.119-128
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• 2002

In this paper, we consider the HB estimators of small area means with repeated survey. mao and Yu(1994) considered small area model with repeated survey data and proposed empirical best linear unbiased estimators. We propose a hierachical Bayes version of Rao and Yu by assigning prior distributions for unknown hyperparameters. We illustrate our HB estimator using very popular data in small area problem and then compare the results with the estimator of Census Bureau and other estimators previously proposed.

• Journal of Plant Biology
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• v.39 no.1
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• pp.49-55
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• 1996

We have studied the DNA of Allium sativum L. with respect to highly repetitive sequences. Fast reassociated DNA fragments expected to be highly repetitive sequences based on $C_{o}t$ curve were isolated and characterized. Their copy numbers were approximately $10^{5}~10^{7}$ per haploid genome. Nucleotide sequences analysis of six candidates reveals that their G/C content were low, 25-40% and typical patterns of repeating sequences exist. Repeat sequences were used as probes to access restriction fragment length polymorphism (RFLP) of genomic DNAs of four local clones, Tanyang, Mungyong, So san, and Uisong. The hybridization pattern were very similar among these four local clones.clones.

• Journal of the Korean Geotechnical Society
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• v.27 no.3
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• pp.63-73
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• 2011

The behavior of laterally cyclic loaded piles is affected by the magnitude and number of cycles of cyclic lateral loads as well as loading method (1-way or 2-way loading). In this study, calibration chamber tests were carried out to investigate the effects of loading method of cyclic lateral loads on the behavior of piles driven into sand. Results of the chamber tests show that the permanent lateral displacement of 1-way cyclic loaded piles is developed in the same direction as the first loading, whereas that of 2-way cyclic loaded piles is developed in the reverse direction of the first loading. 1-way cyclic lateral loads cause a decrease of the ultimate lateral load capacity of piles, and 2-way cyclic lateral loads cause an increase of the ultimate lateral load capacity of piles. The change of ultimate lateral load capacity with loading method of cyclic lateral loads increases with increasing number of cycles. It is also observed that the 1-way cyclic loads generate greater maximum bending moment than 2-way cyclic loads for piles in cyclic loading step and generates smaller maximum bending moment for piles in the ultimate state. It can be attributed to the difference in compaction degree of the soil around the piles with loading method of cyclic lateral loads. In addition, it is founded that 1-way and 2-way cyclic lateral loads cause a decrease in the maximum bending moment of piles in the ultimate state compared with that of piles subjected to only monotonic loads.

• The Korean Journal of Applied Statistics
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• v.11 no.2
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• pp.205-219
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• 1998

Statistical analyses have been perf7rm7d to find factors affecting chronic renal allograft dysfunction for 114 renal transplanted patients. Renal function was evaluated using serum creatinine values every three months during 1 year to 5 years after transplantation. Statistical models for the repeated measures were considered to evaluate factors affecting the reciprocal of serum creatinine values. This paper focuses on some common problems on the choice of correlation matrices occurred in the analysis of repeated measures.

• Polymer(Korea)
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• v.25 no.2
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• pp.270-278
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• 2001

Hydrogels for wound dressing were manufactured using poly(vinylalcohol)(PVA) and poly(N-vinylpyrrolidone)(PVP). The hydrogels were obtained by exposing to $^{60}$ Co${\gamma}$-rays after freezing and thawing of aqueous solutions of PVA and PVP to improve mechanical strength. Mechanical properties such as gelation, water absorptivity and gel strength were examined after repeating the \"freezing and thawing\" of PVA/PVP hydrogels, and then irradiating them at 40 kGy. The PVA/PVP ratio was in the range of 30:70 ~ 100:0, and the solid concentration of PVA/PVP was 20 wt%. The gelation and strength of hydrogels were much higher when \"freezing and thawing\" and the irradiation process were used than when only the irradiation process was utilized. In addition, the mechanical properties of PVA/PVP hydrogels after repetition of \"freezing and thawing\" are discussed. thawing\" are discussed.ssed.