• Journal of Computing Science and Engineering
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• v.3 no.4
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• pp.195-215
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• 2009

Worst-case execution time (WCET) analysis is critical for hard real-time systems to ensure that different tasks can meet their respective deadlines. While significant progress has been made for WCET analysis of instruction caches, the data cache timing analysis, especially for set-associative data caches, is rather limited. This paper proposes an approach to safely and tightly bounding data cache performance by computing the worst-case stack distance of data cache accesses. Our approach can not only be applied to direct-mapped caches, but also be used for set-associative or even fully-associative caches without increasing the complexity of analysis. Moreover, the proposed approach can statically categorize worst-case data cache misses into cold, conflict, and capacity misses, which can provide useful insights for designers to enhance the worst-case data cache performance. Our evaluation shows that the proposed data cache timing analysis technique can safely and accurately estimate the worst-case data cache performance, and the overestimation as compared to the observed worst-case data cache misses is within 1% on average.

• The Journal of Korean Academic Society of Nursing Education
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• v.15 no.2
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• pp.159-165
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• 2009

Purpose: The purpose of this study was to identify clinical competence and to analyze influencing factors on clinical competence for second year college nursing students. Methods: The data were collected from 183 students by means of self reported questionnaires with clinical competence, satisfaction of clinical practice experience, critical thinking disposition, and self-directed learning, on June 18th 2007 and June 25th 2008. Results: The influencing factors on clinical competence of nursing students were satisfaction of clinical practice experience and critical thinking disposition. The more adaptable a student's major was, the higher the clinical competence and satisfaction of clinical practice experience. The score of self-directed learning was the highest in the well adapted group of a major. For clinical competence categories, the level of basic nursing was the highest followed by psychosocial nursing, patient education, nursing process, monitoring and patient physical assessment. The level of direct nursing care was the lowest among nursing students. Conclusion: In conclusion, results of this study suggest that constructing a cooperative system between colleges and educational hospitals, intensifying preceptors' and professors' clinical instruction, and developing a multimedia learning module and practice using simulators or standardized patient care is necessary to promote clinical competence of nursing students.

• Speech Sciences
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• v.15 no.2
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• pp.33-51
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• 2008

Difference of learner speech and loanword phonology is investigated in terms of Korean learners' speech and their loanword adaptation of English words with a post-vocalic word-final stop. When we compared the speech of 12 Korean learners in mid-intermediate level with that of eight English speakers, the learner speech did not reflect loanword phonology of the vowel insertion after a voiced word-final stop (e.g., rib$[\dotplus]$, bad$[\dotplus]$, gag$[\dotplus]$ vs. tip[=], cat[=], book[=]), but, instead, the target phonology of vowel lengthening before a voiced word-final stop (e.g., rib[r.I:b], CAD$[k{\ae}:d]$, bag$[b{\ae}:g]$ vs. rip[rI.p], cat$[k{\ae}t]$, back$[b{\ae}k])$. A longitudinal study of learner speech before and after instruction showed some development toward the acquisition of target phonology. The results indicate that learner speech departs from loanword phonology, and approaches to target speech in a faster rate than direct ratio. Thus, native phonology predicts loanword phonology, but lends little support to learner speech. Our results also indicate that loanword phonology is constant, while learner speech changes toward the acquisition of target phonology.

• Journal of Technologic Dentistry
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• v.29 no.2
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• pp.141-150
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• 2007

The purpose of this study was to ascertain the bonding durability of self-etching dentin bonding agents to dentin by means of shear bonding strength. Several acid-etching dentin bonding system (ESPE Z100) and self-etching dentin bonding systems (DEN-FIL, GRADIA DIRET) were used. The occlusion surface of human molars were ground flat to expose dentin and treated with the etch bonding system according to manufactures instruction and followed by composite resin application. After 24hours of storage at 37$^{\circ}C$, the shear bonding strength of the specimens was measured in a universal testing machine with a 1mm/min crosshead speed. An one-way analysis of variance and the scheffe test were performed to identify significant differences (p<0.05). The bonded interfacial surfaces and treated dentin surfaces were examined using a SEM. Through the analysis of shear bond strength data and micro-structures of dentin-resin interfaces, following results are obtained. In dentin group, the shear bond strength of DEN-FIL showed statistical superiority in comparison to the other groups and followed by ESPE Z100 and GRADIA DIRECT (p<0.05).

• Journal of Korean society of Dental Hygiene
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• v.10 no.5
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• pp.797-805
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• 2010

Objectives : This study was application problem-based learning(PBL) of performance oral health manage in dental hygiene education. and evaluate on learning effect - learning attitude, student assessment(good or bed). Methods : For this study, we sampled 31 dental hygiene students composed of PBL group, Dept of Dental Hygiene, A college. The period of this study was 1 semester(from september, 2008 to December, 2008). To identify the effect of PBL on learning attitudes, student assessment, we used a t-test and compared pre & post effects of PBL using a paired t-test and General Linear Model(GLM), McNemar test. Results : The results of this study that problem based learning(PBL) for dental hygiene students education was more effective in learning process and effect of PBL rather than direct instruction. students assessment results that problem based learning improves their medicine knowledge and communication. Conclusions : This study suggest that PBL contribute to enhancing learning attitudes, learning effect and solve the real problems through self-directed learning.

• Journal of Industrial Convergence
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• v.18 no.1
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• pp.17-23
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• 2020

This study developed augmented reality contents for assembly of automobile engine parts for blended learning and confirmed the usefulness of educational effects through questionnaire.The curriculum for automobile engine assembly was designed and the shape, location, and assembly order of parts to be assembled according to each curriculum were developed as augmented reality contents. The AR simulations are combined with learner-centered collaborative activities so that students are actively involved in knowledge acquisition. The teachers' role, therefore, shifts. Rather than delivering direct instruction, they take on the role of facilitator, allowing them to personalize learning according to student performance, learning preferences and learning goals. As the responsibility of knowledge acquisition shifts to the students, higher level skills such as complex problem solving, social skills, process skills, systems skills and cognitive abilities are deepened and reinforced.

• Korean Journal of Child Studies
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• v.18 no.2
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• pp.283-297
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• 1997

This study examined the development of verbatim and gist memory, and the effects of the relevance and inferential direction of the task on the development of the verbatim and gist memory. The subjects were second, fourth and sixth grade children in elementary schools. Each age group consisted of forty children. Eight sets of inference tasks were administered to each subject. In the task, the relevent and the extraneous sentences were mixed for inferential direction. The sentences that described 'which term is more' were inserted in half of the task and the sentences that indicated the direct numbers were included in the other half of the task. The task was presented by the audio tape in which instruction was recorded by one speaker. Results showed that (1) age differences in verbatim memory were significant but age differences in gist memory were not significant. These results indicate that the processes of verbatim and gist memory are separate and independent. (2) The relevance and inferential direction of the task affect gist memory but no verbatim memory. This result also supported independence between verbatim and gist memory. It was suggested that these results can be interpreted in terms of fuzzy trace theory.

• Journal of the Korea Institute of Building Construction
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• v.8 no.5
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• pp.75-83
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• 2008

Larger and more sophisticated building construction requires more input resources such as worker, materials and devices. Growing resource volume brings risks at a construction site. The industry makes an effort to protect probable incidents at the site by organizing a safety management team. conducting a safety instruction and etc, but losses especially in the construction are higher than other industries. Major reason is that the safety management program is conducted only at the step of construction work and a root cause is not eliminated. Conventionally a concerned party shifts the blame to other parties such as constructor and site workers who are direct participants in the construction site. However, the whole causes of incidents go to the all subject of the construction not only the constructor but the client, designer and others related in the construction, and especially the clients are heavily involved in general concerns of the project. Therefore, this study is defined the role of the clients in nations and domestic condition of construction safety management is investigated. And it is analyzed surveys to prevent incidents at construction sites, and suggested the role of the clients which is classified pre and post construction, and in the middle of construction, and also categorized planning and design & construction schedule especially for the pre-construction level.

• Journal of the Korean Home Economics Association
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• v.34 no.3
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• pp.305-325
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• 1996

This study was designed to compare mothers' beliefs of literacy development and home literacy environment and to explore how the children interacted with their mother during literacy activities and how they used the strategies to develop knowledge of literacy. The qualitative data was collected from multiple sources of naturalistic information and analyzed through triangulation of diverse methods including participant observations in the home, parental during literacy events, written logs kept by the mothers, the children's writing products, three emergent assessment forms, and photographs. The three preschoolers and their mothers provided different literacy experiences to support their children's emerging conventional literacy development. Child 1's mother highly valued the rich home literacy environment and the child 1's initiative interactions during literacy events. Child 3's home literacy context was very similar to her Montessori classroom's phonic approach and writing skills. Child 2 was provided with an inappropriate literacy environment at home through direct instruction and an emphasis on correct writing. All of the children were interested and attended to story. Child 1 interacted with her mother in expanded cycles as child's initiation, mother's clarification, and child's evaluation, compared with the child 2's simple cycle and the child 3's classroom-like cycle as mother's initiation, child's response, and mother's evaluation. The children and their mothers employed a number of diverse strategies to understand knowledge of literacy. Importantly parent education needs to emphasize the importance of playful one to one mother-child interaction, a functional holistic literacy environment., and strategies for expanding child's knowledge with parent as mediator.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.11
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• pp.2658-2663
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• 2014

To minimize low latency and improve the processing speed of the stock trading system, various technologies have been introduced. However, expensive network equipment has limitation for improving speed of trading system. Also, it is true that there is not much advantage by introducing those kind of systems. In this paper, we propose a low-Latency SPT(Safe Proper Time) scheme for overcoming the stock trading system in a cloud. The proposed method minimizes the CPI in order to reduce the CPU overhead that is based on the understanding of the kernel. and this approach satisfies the data timeliness.