• 대한안전경영과학회지
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• 제14권3호
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• pp.111-117
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• 2012

In this paper to prevent human errors analyzed the causes of railway accidents and human error in last 5 years(2007~2011). The 2nd Railway Comprehensive Safety Plan currently being implemented in the safety business for prevention of human error. The accidents are often resulted from multiple causes with hardware failure and human errors. And prevention of human error associated with the implementation details of the priority projects, 14 projects were selected by draw. Then Analytic Hierarchy Process(AHP) methodology was used to select what projects were effective to human error.

• Management Science and Financial Engineering
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• 제19권1호
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• pp.1-10
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• 2013

Hierarchical forecasting strategy does not always outperform direct forecasting strategy. The performance generally depends on demand features. This research guides the use of the alternative forecasting strategies according to demand features. This paper developed and evaluated various classification models such as logistic regression (LR), artificial neural networks (ANN), decision trees (DT), boosted trees (BT), and random forests (RF) for predicting the relative performance of the alternative forecasting strategies for the South Korean navy's spare parts demand which has non-normal characteristics. ANN minimized classification errors and inventory costs, whereas LR minimized the Brier scores and the sum of forecasting errors.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2006년도 춘계학술대회
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• pp.334-337
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• 2006

This paper considers the problem of selecting the most profitable process mean for production processes where measurement errors exist in inspection systems. For such situations, a sequential inspection procedure is proposed to reduce measurement errors. The decision to accept, reject, or take an additional inspection of an item is made at every measurement point until the number of repeated measurements reaches its upper bound. An expected profit model is constructed and the optimal process mean, the cut-off values, and the upper bound of the number of repeated measurements are obtained when accepted(rejected) items are sold at regular(reduced) price. A numerical study is performed to investigate the performance of the proposed procedure.

• 식물병연구
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• 제21권3호
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• pp.180-185
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• 2015

In the present work, a pair of primers specific to Tomato yellow leaf curl virus (TYLCV) was designed to allow specific amplification of DNA fragments from any TYLCV isolates using an extensive alignment of the complete genome sequences of TYLCV isolates deposited in the GenBank database. A pair of primers which allows the specific amplification of tomato ${\beta}$-tubulin gene was also analyzed as an internal PCR control. A duplex PCR method with the developed primer sets showed that TYLCV could be directly detected from the leaf crude sap of infected tomato plants. In addition, our developed duplex PCR method could determine PCR errors for TYLCV diagnosis, suggesting that this duplex PCR method with the primer sets is a good tool for specific and sensitive TYLCV diagnosis. The developed duplex PCR method was further verified from tomato samples collected from some farms in Korea, suggesting that this developed PCR method is a simple and reliable tool for rapid and large-scale TYLCV detections in tomato plants.

• Journal of Biosystems Engineering
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• 제36권6호
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• pp.444-452
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• 2011

In this study the characteristics of natural ventilation of Venlo-type greenhouse with continuous roof vents were analyzed using commercial computational fluid dynamics (CFD) code. Developed CFD simulation model was verified by comparison with experimental data. Simulation errors were 1.9-46.0% for air velocity and 1.7-11.2% for air temperature at each measurement point. CFD simulations were conducted to estimate the effect of roof vents opening direction, opening angle, outside wind velocity and wind directions on ventilation rate and climate condition in greenhouse. The results of this study showed that ventilation rate of the present greenhouse was increased linearly in proportion to the increase of roof vent opening angle and outside wind velocity over 2.0 m/s. According to the analysis on the effects of different roof vent opening direction, simultaneous opening of wind and leeward vents showed the highest ventilation rate and lowest mean temperature in greenhouse.

• 대한원격탐사학회지
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• 제32권4호
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• pp.365-382
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• 2016

The results from the Global Positioning System (GPS) measurements of the Mobile Observation Vehicle (MOVE) on the eastern coast of Korea have been compared with REFerence (REF) values from the fixed GPS sites to assess the performance of Precipitable Water Vapor (PWV) retrievals in a kinematic environment. MOVE-PWV retrievals had comparatively similar trends and fairly good agreements with REF-PWV with a Root-Mean-Square Error (RMSE) of 7.4 mm and $R^2$ of 0.61, indicating statistical significance with a p-value of 0.01. PWV retrievals from the June cases showed better agreement than those of the other month cases, with a mean bias of 2.1 mm and RMSE of 3.8 mm. We further investigated the relationships of the determinant factors of GPS signals with the PWV retrievals for detailed error analysis. As a result, both MultiPath (MP) errors of L1 and L2 pseudo-range had the best indices for the June cases, 0.75-0.99 m. We also found that both Position Dilution Of Precision (PDOP) and Signal to Noise Ratio (SNR) values in the June cases were better than those in other cases. That is, the analytical results of the key factors such as MP errors, PDOP, and SNR that can affect GPS signals should be considered for obtaining more stable performance. The data of MOVE can be used to provide water vapor information with high spatial and temporal resolutions in the case of dramatic changes of severe weather such as those frequently occurring in the Korean Peninsula.

• 보건행정학회지
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• 제16권3호
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• pp.70-85
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• 2006

The purposes of this study were (1) to describe patients' behaviors to protect themselves from medical errors and their involvement in decision making on the diagnostic and treatment procedures (2) to examine whether patients' characteristics, such as age, sex, education, experience of hospitalization and/or surgery influence their self protect behaviors and involvement in decision making on the diagnostic and treatment procedures. A survey was conducted with 99 patients visited one university hospital in Seoul, Korea. A 20-item questionnaire, a 4-point Likert scale, was used to measure the degree of patients' active involvement in decision making; patients' self protect behaviors regarding medication, hospitalization, and surgery; and communication (Cronbach's alpha=0.801). SPSS 12.0 was used for the descriptive and correlation analysis. Only 6.1% of the participants were involved in the decision making process for the diagnostic tests and treatment. More patients did self-protect behaviors associated with the medication than other areas but widely varied from 18.2 to 94.3 % among various items. More people with age of 60 or older compared to people in younger age groups reported more protect behaviors particularly associated with medication. Patient education is needed to improve their active role in preventing medical errors and to promote patients' safety.

• 경영과정보연구
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• 제35권4호
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• pp.213-227
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• 2016

본 연구는 경영자의 능력이 자본시장에서의 정보비대칭 현상에 미치는 영향을 살펴보았다. 이를 위해, 2000년부터 2013년까지 유가증권 시장에 상장된 2,246개 기업-연도 표본을 대상으로 경영자의 능력이 정보비대칭 변수의 대용치인 재무분석가의 이익예측 정보에 어떠한 영향을 미치는지를 분석하였다. 분석을 위해, Demerjian et al. (2012)의 방법에 따라 DEA(Data Envelopment Analysis)를 이용하여 경영자의 능력을 측정하였고, 이렇게 측정된 경영자의 능력 변수와 재무분석가의 이익예측 오차(error) 및 편의(bias) 변수와의 관계를 분석하였다. 분석결과, 경영자의 능력이 뛰어날수록 재무분석가의 이익예측오차가 감소하였고, 재무분석가의 낙관적인 이익예측편의 또한 감소하는 것으로 나타났다. 본 연구는 경영자의 높은 능력으로 인한 회계정보의 질적 향상이 자본시장에서 정보비대칭 현상을 감소시켰음을 보여주었다는 점에서 공헌점을 가진다.

• 한국기록관리학회지
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• 제20권3호
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• pp.1-21
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• 2020

국가기록원은 2015년부터 보존기간 30년 이상의 표준 전자문서를 중앙행정기관으로부터 이관 받고 있다. 이 과정에서 다양한 종류의 오류와 비효율이 발견되었으나, 그 오류원인을 분석하고 문제해결을 위한 연구는 없었다. 본 연구를 통하여 이관 시 발견되는 대부분의 오류가 생산단계에서 발생하는 것을 확인하고, 이를 해결하기 위한 4가지 방안을 제안한다. 첫째, 전자문서를 결재하기 전에 본문 및 첨부 파일의 결함을 체크하여 오류를 사전에 방지한다. 둘째, 결재와 동시에 전자파일 단위로 전자지문을 생성 및 관리하여 무결성을 보장한다. 셋째, 이관 및 보존 과정에 전자지문 비교·확인 및 결함체크 절차를 적용하여 자동으로 무결성 검증 및 이관 검수를 수행한다. 넷째, 기록화 대상 기준 및 무결성 보장 기술 등이 생산단계에 제대로 적용되는지 관리 및 감독한다.

• Communications for Statistical Applications and Methods
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• 제17권5호
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• pp.625-637
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• 2010

In this paper we propose generalized multi-phase multivariate ratio estimators in the presence of multiauxiliary variables for estimating population mean vector of variables of interest. Some special cases have been deduced from the suggested estimator in the form of remarks. The expressions for mean square errors of proposed estimators have also been derived. The suggested estimators are theoretically compared and an empirical study has also been conducted.