• Title, Summary, Keyword: Demand Performance

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The Impact of Demand Features on the Performance of Hierarchical Forecasting : Case Study for Spare parts in the Navy (수요 특성이 계층적 수요예측법의 퍼포먼스에 미치는 영향 : 해군 수리부속 사례 연구)

  • Moon, Seong-Min
    • Korean Management Science Review
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    • v.29 no.1
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    • pp.101-114
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    • 2012
  • The demand for naval spare parts is intermittent and erratic. This feature, referred to as non-normal demand, makes forecasting difficult. Hierarchical forecasting using an aggregated time series can be more reliable to predict non-normal demand than direct forecasting. In practice the performance of hierarchical forecasting is not always superior to direct forecasting. The relative performance of the alternative forecasting methods depends on the demand features. This paper analyses the influence of the demand features on the performance of the alternative forecasting methods that use hierarchical and direct forecasting. Among various demand features variability, kurtosis, skewness and equipment groups are shown to significantly influence on the performance of the alternative forecasting methods.

Demand Performance and Preference of UV Protective Hat with Demographic Characteristics (인구통계적 특성에 따른 자외선차단모자의 요구성능과 선호도)

  • Kang, Mi-Jeong;Kwon, Young-Ah
    • Fashion & Textile Research Journal
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    • v.12 no.3
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    • pp.372-380
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    • 2010
  • The purpose of this study were to investigate a preference and demand performance of UV protective hat for outdoor sports activities. Data collected from 259 adults from survey were analyzed by frequence analysis, crosstabs, t-test, and ANOVA using SPSS 17.0. The results are as follows. A demand performanc of UV protective hats were a demand performance for designs, colors, fabrics, lightness, UV protection, and easy care. It showed that the respondents worn the hats for skin health and didn't wear for sun block. The demand performance of UV protective hat showed difference according to gender and age. The favorite type of UV protective hat was cap, and there was no difference between young and old age. Male preferred the cap styles, while female preferred the wide brim styles for UV protection. The preferred fiber contents of the respondents were cotton and functional fiber.

A Study on the Preference and Requirement Performance for Clothing Materials of the Patients having Atopic Dermatitis (아토피 피부염 환자들의 의복 소재 선호도 및 요구 성능)

  • Park, Young-Hee
    • The Research Journal of the Costume Culture
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    • v.16 no.4
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    • pp.681-695
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    • 2008
  • This study was accomplished to investigate the preference of clothing materials and the clothing demand performance for underwear and everyday dress of atopic patients. As this study was the research study by a use of a questionnaire, the finally total 987 copies of the collected questionnaires were used to analyze the data. SPSS was used for the statistical analysis of data. To analyze the data, frequency analysis, percentage, $X^2$-test, reliability analysis, factor analysis, t-test, ANOVA and Duncan's multiple comparisons were used. The results obtained are as follows. In factor analysis for clothing materials and the demand performance which atopic patients favor, the preference factors for underwear materials were classified as pliability/a sense of weight, a sense of cold and warmth, tactility, and elasticity. Those for everyday wear were classified as pliability/surface roughness, a sense of cold and warmth, a sense of weight, and elasticity. And the demand performance factors for underwears were classified as thermophysiology, care convenience, and skin contact. Those for everyday wear were classified as comfortableness and care convenience. In the difference analysis for the preference and the demand performance, Both everyday wear and underwear showed a significant difference for the preference and the demand performance according to gender, age, income, education level, and occupation.

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Difference Between Nursing Demand and Perceived Nursing Performance in Hemodialysis Patients (혈액투석 환자의 간호요구도와 지각된 간호수행도 차이)

  • Kim, Son-Jung;Kim, Hee-Seung
    • Journal of Korean Academy of Fundamentals of Nursing
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    • v.18 no.3
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    • pp.310-316
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    • 2011
  • Purpose: In the present study, the difference in patients' nursing demands and nursing performance as perceived by the patients was examined. Methods: The participants were 272 patients on maintenance hemodialysis at five university hospitals. Nursing need and nursing performance were measured using the tool developed by Lee for this study. Results: The mean score for nursing demand was 3.35 points out of 4. The scores were higher for participants with middle school graduation or less, those not professing religion, and those whose medical insurance was of the medicaid type. The mean score for perceived nursing performance was 3.22 points out of 4. Nursing performance as perceived by hemodialysis patients was lower than nursing demand for 22 of 28 items. The item with the largest difference between nursing performance and nursing demand was 'Give a pain-free injection', followed by 'Explain about insurance benefits and supports' and 'Maintain quiet environment in the hemodialysis unit enabling rest during hemodialysis'. Conclusion: The results show that nursing performance as perceived by hemodialysis patients was lower than nursing demand. This result indicates a need to develop appropriate strategies to enhance nursing performance, especially for items that showed low nursing performance.

Effect of Information Quality Level and Customer Demand on Performance Measures in a Supply Chain (정보의 품질 수준과 고객 수요가 공급 사슬의 수행도에 미치는 영향)

  • Park, Kyoung-Jong
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.35 no.2
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    • pp.138-146
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    • 2012
  • This paper studies the effect of information quality level and customer demand on performance measures in a supply chain. The information quality level compares 2 types, the information levels of a customer demand and a lead time. The customer demand process follows a general auto-correlated AR(1) process without seasonality. In the AR(1) process, ${\sigma}$ indicates the degree of demand fluctuation and ${\rho}$ means the trend of customer demand. ANOVA tests using a 5% significance level are performed in SPSS to examine significant performance changes among various cases.

Demand Paging Method Using Improved Algorithms on Non-OS Embedded System (Non-OS 임베디드 시스템에서 개선된 알고리즘을 적용한 요구 페이징 기법)

  • Lew, Kyeung Seek;Jeon, Chang Kyu;Kim, Yong Deak
    • IEMEK Journal of Embedded Systems and Applications
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    • v.5 no.4
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    • pp.225-233
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    • 2010
  • In this paper, we try to improve the performance of the demand paging loader suggested to use the demand paging way that is not based on operating system. The demand paging switching strategy used in the existing operating system can know the recently used pages by running multi-processing. Then, based on it, some page switching strategies have been made for the recently used pages or the frequently demanded pages. However, the strategies based on operating system cannot be applied in single processing that is not based on operating system because any context switching never occur on the single processing. So, this paper is trying to suggest the demand paging switching strategies that can be applied in paging loader running in single process. In the Return-Prediction-Algorithm, we saw the improved performance in the program that the function call occurred frequently in a long distance. And then, in the Most-Frequently-Used-Page-Remain-Algorithm, we saw the improved performance in the program that the references frequently occurred for the particular pages. Likewise, it had an enormous effect on keeping the memory reduction performance by the demand paging and reducing the running time delay at the same time.

Parametric study on probabilistic local seismic demand of IBBC connection using finite element reliability method

  • Taherinasab, Mohammad;Aghakouchak, Ali A.
    • Steel and Composite Structures
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    • v.37 no.2
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    • pp.151-173
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    • 2020
  • This paper aims to probabilistically evaluate performance of two types of I beam to box column (IBBC) connection. With the objective of considering the variability of seismic loading demand, statistical features of the inter-story drift ratio corresponding to the second, fifth and eleventh story of a 12-story steel special moment resisting frames are extracted through incremental dynamic analysis at global collapse state. Variability of geometrical variables and material strength are also taken into account. All of these random variables are exported as inputs to a probabilistic finite element model which simulates the connection. At the end, cumulative distribution functions of local seismic demand for each component of each connection are provided using histogram sampling. Through a parametric study on probabilistic local seismic demand, the influence of some geometrical random variables on the performance of IBBC connections is demonstrated. Furthermore, the probabilistic study revealed that IBBC connection with widened flange has a better performance than the un-widened flange. Also, a design procedure is proposed for WF connections to achieve a same connection performance in different stories.

A Study on Economic Demand Response NBT and Performance (우리나라 전력시장에서 경제성 DR의 NBT 및 낙찰 관계 분석)

  • Yang, Min Seung;Lee, Sung Moo
    • Current Photovoltaic Research
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    • v.5 no.3
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    • pp.100-104
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    • 2017
  • This paper analyzes the correlation between Net Benefit Test (NBT) and System marginal price (SMP), which has a significant impact on the allocation of demand response (DR) resources in resource scheduling and commitment (RSC) process, based on the performance data of the demand resource market which has been established in 2014. Demand resources compete with generation resources in the RSC process, and it is prescribed to use demand resources only when net benefit occurs. Analysis result shows that the larger the SMP than the Net Benefit Threshold Price (NBTP), the more the winning bid of demand response resource was. It is interpreted that the introduction of NBT in DR market is justified. The demand resource market has been steadily growing. It is required to expand the scope of resources up to the small-sized DR, and to expand the functionalities of demand resources not only in the current energy market but also in the reserve market in the future. In order for that, institutional improvements are required.

Beyond Accuracy and Speed: Task Demands and Mathematical Performance

  • Sun, Xuhua Susanna
    • Research in Mathematical Education
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    • v.16 no.3
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    • pp.155-176
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    • 2012
  • It is an important issue to explore classroom environments which are conducive to developing students' mathematical performance. This study explores the effects of different classroom environments (solution-demand and corresponding-time setting) on mathematical performances. Fourteen and eighteen prospective teachers were required to prove a task under different conditions respectively: a) Cognitive demand of multiple-solution corresponding time of three hours, and b) Cognitive demand of a right solution corresponding time of 20 minutes. We used SOLO as the assessment tool for mathematical performance from quality perspective. Significant differences were found in the quantity and quality of mathematical performance. The regular environment focusing on speed and accuracy were found to be directly linked to low levels of performance. The findings above provide implications to the cognitive benefits of multiple-solution demand and corresponding time setting.

A Study on the Knowledge about Pediatric Asthma and the Educational demand on Mothers of children with Asthma (천식 아동 어머니의 지식정도 및 교육요구도 조사)

  • Kwon, Mi-Kyung;Lee, Kyung-Min
    • Korean Parent-Child Health Journal
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    • v.5 no.2
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    • pp.191-205
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    • 2002
  • This study was conducted to provide the baseline data for preparing an educational program for mothers of pediatric asthma patients by identifying the knowledge about asthma, mother's educational demand and the perceived educational performance. This study used survey design. The subjects were chosen from the mothers whose children have received pediatric asthma treatment or who have admitted in the pediatric unit of major hospitals using selection criteria. The total number of subjects were 63 mothers. The data collection period was from May 1st, 2001 to April 17th, 2001. Instruments used for this study were knowledge examination, educational demand evaluation, and educational performance. The data were analysed using t-test, ANOVA with SPSS PC(Version 10.0). The results of this study were as follows. 1. Mean score of knowledge about pediatric asthma was 17.95, which suggests the mothers of children with asthma have a medium knowledge level. The highest grade was knowledge about treatment and follow management and the lowest grade was knowledge about diet. 2. Demand for education showed 4.23, which suggests the mothers of children with asthma have high educational demand. The highest score was about exercise and activity in daily life and the lowest score was medication. 3. Perceived educational performance score of themselves showed 2.40, which suggests the mothers of children with asthma thought that health team do not give enough education to them. The highest score was knowledge about pediatric asthma itself and the lowest score was exercise and activity in daily life. 4. Demand for education and perceived educational performance about pediatric asthma showed significant difference in all areas. 5. There were no statistically significant difference noted between general characteristics and degree of knowledge, educational demand and perceived educational performance about pediatric asthma. In conclusion, there needed a systematic educational program development for the mothers of children with asthma. Especially, an education program for mothers in the beginning period of pediatric asthma should be emphasized.

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