• Spatial Information Research
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• v.20 no.6
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• pp.139-144
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• 2012

The R*-tree manages hierarchical nodes for efficient access of spatial data. We propose a method that maintains partial nodes of R*-tree in the GPU memory to improve efficiency using parallel processing. The proposed method attempts to load as many nodes as possible to the GPU memory. The new nodes are inserted to manage the rest of R*-tree nodes in the main memory. The experimental result shows that the proposed method is more efficient than the main memory based R*-tree.

• Journal of Korean Society for Quality Management
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• v.48 no.3
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• pp.409-420
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• 2020

Purpose: The purpose of this study is to develop a measurement scale for evaluating the auditory affect of automobile engine sounds. Methods: In order to collect affective vocabulary, literature review, user tests, and expert interviews were conducted. Affective vocabulary related to automobile engine sounds was selected through three methods. To develop the evaluation scale, open/close card-sorting and expert interview-based survey method was used. Results: The results of this study are as follows; In order to select the main affective vocabulary from the collected vocabulary, 39 vocabularies with a frequency of 5 or higher were selected as vocabulary expressing the main auditory affect of automobile engine sounds. Each affective vocabulary is divided into three di- mensions, it was confirmed that the conceptual model for the auditory affect of automobile engine sounds is composed of three levels: intuitive, descriptive, and evaluative of hierarchical structure. As a result of the study, four indices of intuitive dimension, seven indices of descriptive dimension, and one index of evaluative dimension were derived from the evaluation scale of the auditory affect in an automobile engine sound. Conclusion: The auditory evaluation scale developed in this study can be used to systematically measure and evaluate the auditory affect of automobile engine sounds.

• Journal of Korean Public Health Nursing
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• v.31 no.3
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• pp.492-504
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• 2017

Purpose: This study aims to investigate the effect of employment of elderly over 65 years on elderly depression using the "Nation Elderly Survey 2014". Methods: The subjects were 10,451 elderly aged 65 or older who were selected from 16 cities and provinces via multilevel stratified sampling method. In an effort to represent well the nation's elderly population, composite sample analysis method was used for the study, and a hierarchical logistic regression analysis was performed to identify those factors affecting the depression among the elderly population. Results: The factors affecting the depression were education level, household income, Perceived health status, smoking, drinking, physical activity, body mass index and employment status. It was found that the unemployed persons were 1.68 times more likely to be depressed than those who remain employed. Conclusion: Where the average life expectancy is getting longer and the poverty rate of elderly is high, employment activities of the elderly are of great significance in terms of ensuring economic stability as well as in lowering medical expenses through reduction of depression. Therefore, it is necessary to increase the employment rates of the elderly for economic, social and healthcare perspectives.

• Korean Journal of Occupational Health Nursing
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• v.29 no.4
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• pp.306-315
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• 2020

Purpose: This study was conducted to identify the effects of caffeine intake by shift workers on sleep, considering various variable related to the sleep health of shift workers. Methods: A descriptive survey study was conducted with 128 employees who worked shifts. Respondents were surveyed on their of caffeine intake behavior, schedule type, quality of sleep, health promotion behavior, and occupational stress. Differences in their quality of sleep were assessed using the t-test and analysis of variance, while factors influencing the effect of caffeine intake on the quality of sleep were analyzed using hierarchical logistic regression. Results: The average Pittsburgh Sleep Index, Korean Version score of those surveyed was 7.3±3.25, indicating that their quality of sleep was low. On the other hand, their aveage daily intake of caffeine was 1.6±0.99 cups (1 cup =150 mL) and 116.4±77.58 mg/dL of caffeine. When the various variables that could have affected the quality of sleep were corrected, an increase in the amount of caffeine consumed was found to lead to a decrease in the quality of sleep (p=.015). Conclusion: Caffeine intake by shift workers has a significant bearing on their quality of sleep; therefore, such intake should be adjusted to improve their sleep health.

• Journal of the Korean Operations Research and Management Science Society
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• v.37 no.3
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• pp.23-37
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• 2012

As Customer Relationship Management (CRM) strategy is becoming a core competence more recently, many companies want a reliable CRM assessment system which enables measuring and diagnosing corporate customer strategies for building an optimized CRM strategy. However, there has been short of researches on developing the CRM diagnosis methodology that is directly applicable to real practices. Drawing upon the theoretical framework of CRM scorecard, we developed and suggested a corporate CRM diagnosis methodology that can systematically understand and assess the corporate CRM capability and performance, guiding their future directions. Companies can search the important but weak areas among various CRM strategy subjects through the proposed diagnostic procedures. This framework has a hierarchical structure that has four evaluative domains each of which has several evaluative subjects consisting of many evaluative themes: the score of upper factor is the weighted average of its subordinate factor scores. And the score of each evaluative theme is the weighted average of quantitative and qualitative evaluative indexes. Quantitative indexes are calculated by analyzing customer and sales data and qualitative ones are derived from survey data. Each evaluative index has more than one measure and its score can be derived from its own formula consisting of the measures. To prove the concept, we applied this framework to a real company and concluded that it might be appropriate to understand the corporate CRM strategy situation, find the pain points, and resolve them for better CRM implementation.

• Korean Journal of Adult Nursing
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• v.28 no.6
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• pp.669-679
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• 2016

Purpose: The purpose of this study was to explore the reported good service experiences from the perspective of elderly residents of long-term care facilities. Methods: Of those residents who are 65 years old or older, 14 residents whose length of stay were one month or longer and scores of the K-Mini Mental State Examination were 15 or higher were interviewed. The interview data formed the basis for the empirical statements about the reported nature of patients' experiences as residents of long-term care facilities. These data were used in concept mapping. Results: Through multidimensional scaling analysis and hierarchical cluster analysis, 62 core statements, two dimensions, and six clusters of good service experiences were derived. The two dimensions were classified as 'care centered-participation centered services' and as 'physical-emotional services.' Six cluster themes emerged as good service experiences: 'safety of care and treatment', 'responsible and supportive staff', 'comfort of living environment', 'mental well-being', and 'respect and communication'. Conclusion: The result of the study provides information about what experiences are important to older adults with cognitive impairment. The concept map can be used to develop a patient experience index for the elderly residents of long-term care facilities.

• Journal of Korean Academy of Nursing Administration
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• v.18 no.2
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• pp.234-243
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• 2012

Purpose: This study was done to: (a) examine relationships between creative nursing practice and job satisfaction, and organizational commitment that nurses perceive in a hospital, and (b) identify creative nursing practice factors affecting job satisfaction and organizational commitment. Method: Using self-report questionnaires including 25 items of the Creative Nursing Practice Index, a descriptive study was conducted with a sample of 387 nurses working in the nursing care units of a general hospital in Seoul, Korea. Data were analyzed, using independent t-test, ANOVA, Pearson correlation, and hierarchical multiple regression analysis. Result: The mean score for nurses performance of creative practice was $2.29{\pm}0.46$ (range 1 to 4). Creative nursing practice had positive correlation with nurses' job satisfaction (r=.427, p<.001) and organizational commitment (r=.433, p<.001). Creative nursing practice factors influencing job satisfaction were implementing customized care (${\beta}$=.158, p=.010), making new knowledge (${\beta}$=.257, p<.001), and searching ideas (${\beta}$=.209, p<.001). Nurses' organizational commitment was influenced by implementing customized care (${\beta}$=.192, p=.002), making new knowledge (${\beta}$=.158, p=.028), searching ideas (${\beta}$=.254, p<.001), sharing ideas (${\beta}$=.250, p=.003), and validating ideas (${\beta}$=.189, p=.036). Conclusions: The results indicate a need to develop nurses' creative competency to pursue quality care as well as increase nurses' job satisfaction and organizational commitment.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.232-234
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• 2006

인터넷 기술의 발달과 디지털 카메라와 같은 디지털 미디어 생산 장비의 발달로 WWW에 이미지 데이터의 양이 급격하게 늘어나면서 웹 이미지에 대한 효율적인 검색에 대한 요구가 증가하고 있다. 본 논문에서는 사용자의 다양한 검색 요구를 만족시킬 수 있도록 기존의 텍스트 기반의 검색과 시각 정보 기반의 검색을 병합하여 수행할 수 있는 웹 이미지 검색 시스템을 설계하고 구현한다. 제안한 웹 이미지 검색 시스템은 웹 이미지 수집 및 검색정보 추출 도구. 검색 서버. 그리고 검색 클라이언트로 구성된다. 웹 이미지 수집 및 검색 정보 추출 도구는 웹에서 이미지를 수집하여 이미지가 속해있는 웹 문서 구조를 이용하여 적절한 키워드를 선택하며 시각 정보 기반의 검색을 지원하기 위해 MPEG-7 시각 정보 기술자(1)를 추출한다. 빠른 검색을 위해 추출된 텍스트 정보는 상용 데이터베이스에 저장되며 MPEG-7 시각 정보 기술자는 고차원 데이터 색인 방법인 HBI (Hierarchical Bitmap Index)(2)를 사용하여 색인 정보를 만들어 사용한다. 검색 클라이언트는 사용자가 각 검색 요소에 가중치를 부여하여 검색 할 수 있도록 하며 원하는 검색 결과를 얻을 때까지 반복하여 검색할 수 있는 연관 피드백 과정도 포함한다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1998.10a
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• pp.3-8
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• 1998

The present work proposes the potential fuzzy framework, based on fuzzy set theory, for supporting decision-making problems, especially, selection problems of a best design in the area of nuclear energy system. The framework proposed is composed of the hierarchical structure module, the assignment module, the fuzzification module, and the defuzzification module. In the structure module, the relationship among decision objectives, decision criteria, decision sub-criteria, and decision alternatives is hierarchically structured. In the assignment module, linguistic or rank scoring approach can be used to assign subjective and/or vague values to the decision analyst's judgment on decision variables. In the fuzzification module, fuzzy numbers are assigned to these values of decision variables. Using fuzzy arithmetic operations, for each alternative, fuzzy preference index as a fuzzy synthesis measure is obtained. In the defuzzification module, using one of methods ranking fuzzy numbers, these indices are defuzzified to overall utility values as a cardinality measure determining final scores. According these values, alternatives of interest are ranked and an optimal alternative is chosen. To illustrate the applicability of the framework proposed to selection problem, as a case example, the best option choice of four design options under five decision criteria for primary containment wall thickening around large penetrations in an advanced nuclear energy system is studied.

• Journal of Korean Society of Transportation
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• v.25 no.4
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• pp.33-42
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• 2007

This study analyzes presentation methods of traffic guide maps to guide drivers easily and correctly to their destinations on complex road networks. The problems of Korea's guidance systems were analyzed and domestic and international road guide maps were compared. This study includes the problems of road number discernment, such as the sizes, colors and marking intervals on the map. The widths and colors of different hierarchical roads were evaluated. The indices, enlarged downtown maps and uncertainty of grade separation on the map were analyzed and the solutions were also provided.