• Ocean and Polar Research
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• v.25 no.spc3
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• pp.385-392
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• 2003

A new type of soft ground breakwater was recently developed, which does not need ground improvement because of light weight and structural characteristics. The various studies about consolidation settlements and lateral behavior of proposed soft ground breakwater have been conducted. But, the systematic investigations on the construction performance and long-term settlements of new type breakwater has not been accomplished. In this study, construction simulation of soft ground breakwater with soil box model test and experiments of the long-term wave loaded breakwater were performed. The results of test shows that it is possible to compensate differential settlements by dead loading and/or suction pressure, and to reduce the consolidation settlements by preloading method. It was also found that the vertical and lateral displacements of long-term wave loaded breakwater were negligible.

• Korea Journal of Hospital Management
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• v.18 no.1
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• pp.42-58
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• 2013

The purpose of this study was to investigate the awareness of long-term care hospitals on pay for performance(P4P) program in Korea. We conducted a cross-sectional, self-administered, the internet based survey from September to October in 2010. The questionnaire was consisted of the levels of awareness and agreement about the program, their preferred design and its possible effects and unintended consequences etc. Among 837 eligible long-term care hospitals in Korea, 114 hospitals(13.6%) were participated in the survey. About one-thirds of long-term care hospitals were not aware of P4P, namely it is important to heighten an awareness of P4P. There were pros and cons on introduction of P4P in Korea. The two major reasons of objections of P4P were the concerns of unintended consequences and the possibility of strengthening government control by implementing P4P. In conclusion, to successfully implement P4P to long-term care hospitals, the Health Insurance Review & Assessment Service(HIRA) in Korea should obtain the long-term care hospitals'opinion as to implementation of P4P.

• English Language & Literature Teaching
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• v.18 no.2
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• pp.67-84
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• 2012

The present study investigated the effect of sentence translation as a production task on short-term and long-term retention of foreign vocabulary. 87 EFL university students at a beginning level, enrolled in reading class participated in the study. The study compared the performance of three groups on vocabulary recall: (1) Control group, (2) Translation group, and (3) Copy group. During the treatment sessions, translation group translated L1 sentences into English, while copy group simply copied given English sentences with each target word. Results of the immediate test were collected each week from week 2 to week 5 and analyzed by one-way ANOVA. Results revealed that regarding short-term vocabulary retention, participants in rote-copy condition outperformed those in translation group. Four weeks later a delayed test was administered to measure long-term vocabulary retention. In contrast, the results of two-way repeated measures ANOVA showed that long-term vocabulary retention of translation group was significantly greater than copy group. The findings suggest that although sentence translation is rather challenging to low-level learners, it may facilitate long-term retention of new vocabulary given the more elaborate and deeper processing the task entails.

• Korean Journal of Community Nutrition
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• v.16 no.5
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• pp.602-612
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• 2011

The purpose of this study was to evaluate importance and performance of dietitian's task at long term care hospitals foodservices in the Busan Kyongnam area. The research was performed through using questionnaires and conducted from June 11 to July 16, 2010 for 186 dietitians at 141 long-term care hospitals. Seventy-two percent of hospitals had two dietitians and 69% of them had a dietitian's office. Fifty-two percent of dietitians has worked for less than 2 years at long term care hospital, and 37.1% of them worked additional tasks. Seventy-three percent of hospitals conducted a therapeutic diet program and the therapeutic diets frequently provided were diabetic diet > tube feeding diet > dysphasia diet > sodium controlled diet. Mean score for the importance (4.36/5.00) and performance (3.91/5.00) of dietitian's tasks were significantly different (p < 0.001). The importance and performance grid showed that the purchase-inspection management and sanitation-safety management were high scores to the importance and performance (doing great area), menu-foodservice management and cooking-working management were low scores to the importance and high scores to the importance (overdone area), and nutrition management was low scores to the importance and performance (low priority). Forty-three percent of dietitians agreed with the needs for role separation between foodservice dietitian and clinical dietitian.

• Nuclear Engineering and Technology
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• v.52 no.11
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• pp.2652-2659
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• 2020

The methyl iodide (CH₃I) removal performance of tri-ethylene-di-amine impregnated activated carbon (TEDA-AC) used in the air cleaning unit of nuclear power plants (NPPs) should be maintained at least 99% between 24 month-performance test period. In order for evaluating the effectiveness of TEDA-AC on the removal performance of CH₃I in nuclear power plant during the operation of NPPs, the long-term test for up to 15 months was carried out under the simulated operating conditions (e.g., 25 ℃, RH 50%, ppb level poisoning gases injection) at nuclear power plants (NPPs). The TEDA-AC samples were analyzed with the Brunauer-Emmett-Teller (BET) specific surface area and TEDA content as well as CH₃I penetration test. It is clearly evident that more than 99% of CH₃I removal performance of TEDA-AC was observed in the TEDA-AC samples during 15 months of long-term operation under the simulated NPP operating conditions including the ppb level of organic and oxide form of poisoning gases. BET specific surface area and TEDA content that can affect the CH₃I removal performance of TEDA-AC were also maintained as those in new TEDA-AC during 15 months of long-term operation.

• Journal of muscle and joint health
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• v.26 no.3
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• pp.270-280
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• 2019

Purpose: The purpose of this study was to identify the levels of knowledge and performance confidence of, and educational needs on ostomy care among nurses in long-term care hospitals. Methods: The participants were 97 nurses from D and C cities. Data were collected from September 6~26, 2019, with self-reported questionnaires including general characteristics, knowledge and performance confidence of, and educational needs on ostomy care. Data were analyzed by using descriptive statistics, t-tests, ANOVAs, Pearson correlation coefficients, and multiple regression analysis. Results: The correct rate of knowledge of ostomy care was 60.1%. In addition, performance confidence of ostomy care was low, while educational needs on ostomy care were high. The knowledge of ostomy care was identified as a factor influencing in educational needs on ostomy care (β=-0.69, p<.001). It explained 42.0% of the variation in educational needs on ostomy care. Conclusion: There are nursing needs about ostomy care for older cancer patients in long-term care hospitals. Thus educational programs of ostomy care that are suitable to apply to the long-term care hospitals are necessary to develop for enhancing nursing capacity.

• Journal of Radiation Protection and Research
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• v.34 no.2
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• pp.77-81
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• 2009

An Area Radiation Monitoring System (ARMS) ionization chamber, which had an 11.8 L active volume, was fabricated and performance-tested at KAERI. Low leakage currents, linearities at low and high dose rates were achieved from performance tests. The correlation coefficients between the ionization currents and the dose rates are 1 at high dose rate and 0.99 at low dose rate. In this study, an integration-type ARMS ionization chamber was tested over a year for an evaluation of its long-term stability at a radioisotope (RI) repository of the Young-gwang nuclear power plant. The standard deviation of dose rate of 1 day data and over a 100-days mean value were 6.2 $\mu$R/h and 2.9 $\mu$R/h, respectively. The fabricated ARMS ionization chamber showed stable performance from the results of the long-term tests. Design and performance characteristics of the fabricated ionization chamber for the ARMS from performance-tests are also addressed.

• Korea Trade Review
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• v.46 no.6
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• pp.191-209
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• 2021

In this paper, various time series analysis models and machine learning models are presented for long-term prediction of export growth rate, and the prediction performance is compared and reviewed by RMSE and MAE. Export growth rate is one of the major economic indicators to evaluate the economic status. And It is also used to predict economic forecast. The export growth rate may have a negative (-) value as well as a positive (+) value. Therefore, Instead of using the ReLU function, which is often used for time series prediction of deep learning models, the PReLU function, which can have a negative (-) value as an output value, was used as the activation function of deep learning models. The time series prediction performance of each model for three types of data was compared and reviewed. The forecast data of long-term prediction of export growth rate was deduced by three forecast methods such as a fixed forecast method, a recursive forecast method and a rolling forecast method. As a result of the forecast, the traditional time series analysis model, ARDL, showed excellent performance, but as the time period of learning data increases, the performance of machine learning models including LSTM was relatively improved.

• Steel and Composite Structures
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• v.20 no.2
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• pp.379-397
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• 2016

Due to creep and shrinkage of the concrete core, concrete-filled steel tubular (CFST) arches continue to deform in the long-term under sustained loads. This paper presents analytical investigations of the effects of geometric nonlinearity on the long-term in-plane structural performance and stability of three-pinned CFST circular arches under a sustained uniform radial load. Non-linear long-term analysis is conducted and compared with its linear counterpart. It is found that the linear analysis predicts long-term increases of deformations of the CFST arches, but does not predict any long-term changes of the internal actions. However, non-linear analysis predicts not only more significant long-term increases of deformations, but also significant long-term increases of internal actions under the same sustained load. As a result, a three-pinned CFST arch satisfying the serviceability limit state predicted by the linear analysis may violate the serviceability requirement when its geometric nonlinearity is considered. It is also shown that the geometric nonlinearity greatly reduces the long-term in-plane stability of three-pinned CFST arches under the sustained load. A three-pinned CFST arch satisfying the stability limit state predicted by linear analysis in the long-term may lose its stability because of its geometric nonlinearity. Hence, non-linear analysis is needed for correctly predicting the long-term structural behaviour and stability of three-pinned CFST arches under the sustained load. The non-linear long-term behaviour and stability of three-pinned CFST arches are compared with those of two-pinned counterparts. The linear and non-linear analyses for the long-term behaviour and stability are validated by the finite element method.

• Communications for Statistical Applications and Methods
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• v.24 no.4
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• pp.325-337
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• 2017

In this paper, we proposed a new long-term lifetime distribution with four parameters inserted in a risk competitive scenario with decreasing, increasing and unimodal hazard rate functions, namely the Weibull-Poisson long-term distribution. This new distribution arises from a scenario of competitive latent risk, in which the lifetime associated to the particular risk is not observable, and where only the minimum lifetime value among all risks is noticed in a long-term context. However, it can also be used in any other situation as long as it fits the data well. The Weibull-Poisson long-term distribution is presented as a particular case for the new exponential-Poisson long-term distribution and Weibull long-term distribution. The properties of the proposed distribution were discussed, including its probability density, survival and hazard functions and explicit algebraic formulas for its order statistics. Assuming censored data, we considered the maximum likelihood approach for parameter estimation. For different parameter settings, sample sizes, and censoring percentages various simulation studies were performed to study the mean square error of the maximum likelihood estimative, and compare the performance of the model proposed with the particular cases. The selection criteria Akaike information criterion, Bayesian information criterion, and likelihood ratio test were used for the model selection. The relevance of the approach was illustrated on two real datasets of where the new model was compared with its particular cases observing its potential and competitiveness.