• Communications for Statistical Applications and Methods
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• v.5 no.2
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• pp.391-401
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• 1998

유한모집단에서 표본을 추출할 때 표본으로 추출되는 경우의 수를 줄이거나 바람직하지 않은 표본들이 추출될 확률을 줄이기 위해서 관리적 선정 방법을 사용한다. 본 연구에서는 여러 가지 표본추출방법들을 관리적 선정에 적용하고 예를 통해서 그 효율성을 비교하였다.

• The Korean Journal of Applied Statistics
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• v.13 no.1
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• pp.145-161
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• 2000

조사비용을 증대시키거나 조사실시에 어려움을 주는 바람직하지 않은 표본들의 추출확률을 줄여주기 위해서 Goodman과 Kish(1950)는 관리적 선정 방법을 제시하였다. 충화추출에서 표본의 수가 셀의 수보다 작은 경우 표본 배분에 문제가 발생한다. 이러한 문제를 해결하기 위해서 관리적 선정을 적용할 수 있는데 Causey 등 (1985)은 수송이론을 이용한 알고리즘을 제안하였고 Sitter와 Skinner(1994), Tiwaridh Nigam(1998)은 선형계획법을 이용하였다. 본 연구에서는 기존 방법들의 문제점들을 다루었으며 추출방법의 이론적 측면을 보완하기 위하여 표본들의 적합성을 고려한 관리적 선정을 제안한다. 아울러 분산을 최소화시키는 관리적 선정방법과 통합관리적 선정 방법도 제시하였다.

• Communications for Statistical Applications and Methods
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• v.3 no.3
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• pp.135-144
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• 1996

표본조사에서는 실사의 비용의 줄어주고 추정치의 정도를 높여 주는 바람직한 표본이 추출되기를 기대한다. Goodman과, Kish(1950)는 기존의 추출방법의 성질을 변화하지 않으면서 바람직한 표본의 추출확률의 놓게 해주고 반면에 바람직하지 않은 표본의 추출확률을 작게 해주는 관리적 선정(controlled selection) 방법을 제시하였다. 본 논문에서는 지금까지 관리적 선정방법이 갖고 있는 한계점과 실제조사에 이 방법을 적용할 때 발생하는 문제점을 파악하여, 향후 관리적 선정방법을 효율적으로 사용하기 위한 연구 방향과 관제를 제시하였다.

• Proceedings of the Korean Association for Survey Research Conference
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• 2001.04a
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• pp.153-165
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• 2001

In this paper we point out another advantage of systematic sampling over simple random sampling, which have not yet been spelled out in the literature. After a single sample is drawn by a sampling scheme, it is important to check whether the achieved sample represents the pupulation well or out. Therefore, a sampling scheme which avoids the possibility of selecting non-preferred samples is desirable. The simulation results are given to illustrate that, in the ordered population, the possibility of selecting non-preferred sample by systematic sampling is lower than that by simple random sampling.

• Survey Research
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• v.2 no.2
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• pp.153-165
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• 2001

In this paper we point out another advantage of systematic sampling over simple random sampling, which have not yet been spelled out in the literature. After a single sample is drawn by a sampling scheme, it is important to check whether the achived sample represents the population well or not. Therefore. a sampling scheme which avoids the possibility of selecting non-preferred samples is desirable. The simulation results are given to illustrate that, in the ordered population, the possibility of selecting non-preferred sample by systematic sampling is lower than that by simple random sampling.

• Proceedings of the Korean Association for Survey Research Conference
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• 2000.11a
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• pp.157-168
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• 2000

In this paper we point out another advantage of systematic sampling over simple random sampling, which have not yet been spelled out in the literature. After a single sample is drawn by a sampling scheme, it is important to check whether the achived sample represents the population well or not. Therefore, a sampling scheme which avoids the possibility of selecting non-preferred samples is desirable. The simulation results are given to illustrate that, in the ordered population, the possibility of selecting non-preferred sample by systematic sampling is lower than that by simple random sampling.

• The Korean Journal of Applied Statistics
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• v.12 no.1
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• pp.261-274
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• 1999

층화임의추출에서 표본크기가 층의 수보다 작은 경우 또는 조사단위들이 넓게 펴져있어 조사비용이 증가하거나 조사의 관리가 어려운 경우에 관리적 선정을 사용한다. 그러나 관리적 선정을 실제조사에 적용할 때 많은 어려움이 있다. 이에 본 논문에서는 관리적 선정을 실제조사를 적용하기 위한 체계적 절차를 제시하였고, 바람직하지 않은 표본들을 순차적으로 제외하고 관리적 선정계획을 세우기 위해서 다양한 측도를 사용하였다. 그러나 예제를 통하여 본 논문에서 제시한 절차의 사용 적합성을 검토하고 측도들을 비교하였다.

• Journal of the Society of Disaster Information
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• v.17 no.1
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• pp.97-111
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• 2021

Purpose: It is expected that various infrastructures diagnosis equipment will be needed as infrastructures management is strengthened to implement the Framework Act on Sustainable Infrastructure Management. It is necessary for a certification system to supply certified products of a reasonable level in accordance with market requirements for various convergence equipment. This paper deals with the introduction of certification system of inspection and diagnosis equipment for infrastructure using advanced technologies. Method: The basic elements, systems and procedures of certification system were reviewed through analyzing and comparing the existing similar certification system in Korea. In addition, a survey was conducted on a catalog method and the minimum performance criterion (sampling survey and complete enumeration survey) to equipment developers (manufacturers), clients and equipment users. Result: This survey showed that clients preferred complete enumeration method on the basis of minimum performance, and equipment users also preferred complete enumeration survey and sample survey, for minimum performance, at a similar rate. On the other hand, equipment developers preferred the catalog method. Conclusion: Clients and users who are the users of the diagnostic equipment preferred the minimum performance criterion because their trust in quality is important. On the other hand, developers(manufacturers) preferred the catalog method which adopts self certification because it is regulated in developing various products. There is no specific plan for the minimum performance standards required for the introduction of the method which users demand, at present. In addition, it is not desirable to force to introduce a certification system because it requires a considerable period of study to prepare the specific standards. Therefore, it is appropriate to operate the system for a certain period of time centering around the catalog method for the stable and continuous development of the infrastructure diagnosis and test equipment market in Korea. Also, it is effective to expand and develop the certification system to the extent that it minimizes the impact on the market when specific plans for the standards are prepared in the future.

• Journal of the Korean Society of Food Science and Nutrition
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• v.45 no.11
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• pp.1649-1657
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• 2016

The purpose of this study was to investigate the body mass index (BMI), dietary intake attitudes, and nutrient intake status according to sugar-containing food intake frequency of 409 college students in Gyeonggi-do. Subjects were categorized into three groups according to sugar-containing food intake frequency: rare intake group (n=113), average intake group (n=195), and frequent intake group (n=101). The average height and weight (P<0.001) of each group were $163.8{\pm}0.11cm$ and $52.9{\pm}8.6kg$, $164.4{\pm}0.1cm$ and $56.2{\pm}6.4kg$, and $167.9{\pm}0.1cm$ and $68.0{\pm}15.7kg$, respectively. The average BMIs of the groups were $19.6{\pm}2.3$, $20.7{\pm}0.8$, and $24.0{\pm}2.7$, respectively (P<0.001). Dietary intake attitude scores of the groups were $30.73{\pm}5.68$, $30.11{\pm}5.51$, and $28.00{\pm}5.31$, respectively (P<0.001). As a result of nutrient intake status, daily averages of energy and carbohydrate intake of the frequent intake group were significantly higher than those of the rare intake group (P<0.05). On the other hand, vitamin A, vitamin $B_1$, and vitamin C intakes of the rare intake group were significantly higher than those of the frequent intake group (P<0.05). Using multiple regression analysis, we found that BMI was the most significant variable affecting sugar-containing food intake. Therefore, nutrition education is necessary to improve nutrient intake while considering sugar intake for maintenance of healthy weight.