• Journal of Computing Science and Engineering
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• v.7 no.1
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• pp.67-80
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• 2013

The worst-case execution time (WCET) of each real-time task in multicore processors with shared caches can be significantly affected by inter-thread cache interferences. The worst-case inter-thread cache interferences are dependent on how tasks are scheduled to run on different cores. Therefore, there is a circular dependence between real-time task scheduling, the worst-case inter-thread cache interferences, and WCET in multicore processors, which is not the case for single-core processors. To address this challenging problem, we present an offline real-time scheduling approach for multicore processors by considering the worst-case inter-thread interferences on shared L2 caches. Our scheduling approach uses a greedy heuristic to generate safe schedules while minimizing the worst-case inter-thread shared L2 cache interferences and WCET. The experimental results demonstrate that the proposed approach can reduce the utilization of the resulting schedule by about 12% on average compared to the cyclic multicore scheduling approaches in our theoretical model. Our evaluation indicates that the enhanced scheduling approach is more likely to generate feasible and safe schedules with stricter timing constraints in multicore real-time systems.

• Journal of Information Display
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• v.3 no.2
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• pp.1-5
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• 2002

A CMOS driving circuit for active matrix type polymer electroluminescent displays was designed to develop an on-chip microdisplay on the single crystal silicon wafer substrate. The driving circuit is a conventional structure that is composed of the row, column and pixel driving parts. 256 gray scales were implemented using pulse amplitude modulation method. The 2-transistor driving scheme was adopted for the pixel driving part. The layout was carried out considering the compatibility with the standard CMOS process. Judging from the layout of the driving circuit, it turns that it is possible to implement a high-resolution display about 400 ppi resolution. Through the HSPICE simulation, it was verified that this circuit is capable of driving a VGA signal mode display and implementing 256 gray levels.

• Journal of KIISE
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• v.42 no.5
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• pp.551-557
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• 2015

The technology using ARM TrustZone draws attention as a new embedded virtualization approach. The ARM TrustZone defines two virtual execution environment, the secure world and the normal world. In such an environment, the inter-world communication is important to extend function of software. However, the current monitor software does not sufficiently support the inter-world communication. This paper presents a new inter guestOS communication scheme, for each world, for the ARM TrustZone virtualization. The proposed communication scheme supports bidirectional inter-world communication for single core and multicore environment. In this paper, It is implemented on a NVIDIA Tegra3 processor based on the ARM Cortex-A9 MPCore and it showed a bandwidth of 30MB/s.

• Nuclear Engineering and Technology
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• v.52 no.1
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• pp.87-100
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• 2020

Performance shaping factors (PSFs) in a human reliability analysis (HRA) are one that may influence human performance in a task. Most currently applicable HRA methods for nuclear power plants (NPPs) use PSFs to highlight human error contributors and to adjust basic human error probabilities (HEPs) that assume nominal conditions of NPPs. Thus far, the effects of PSFs have been treated independently. However, many studies in the fields of psychology and human factors revealed that there may be relationships between PSFs. Therefore, the inter-relationships between PSFs need to be studied to better reflect their effects on operator errors. This study investigates these inter-relationships using two data sources and also suggests a context-based approach to treat the inter-relationships between PSFs. Correlation and factor analyses are performed to investigate the relationship between PSFs. The data sources are event reports of unexpected reactor trips in Korea and an experiment conducted in a simulator featuring a digital control room. Thereafter, context-based approaches based on the result of factor analysis are suggested and the feasibility of the grouped PSFs being treated as a new factor to estimate HEPs is examined using the experimental data.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2020.06a
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• pp.208-209
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• 2020

There is no disagreement that the construction sector will play an important role in inter-Korean economic development cooperation. However, very few studies have been made at North Korea's construction technology. North Korea shows a lot of differences from South Korea, from the quality standards of building materials to construction technology. It is clear that these differences will be a stumbling block to the promotion of construction projects in the inter-Korean cooperation stage. Therefore, the start of inter-Korean economic development cooperation should be preceded by work to clearly recognize each other's differences and lay the foundation for integration or compatibility. The purpose of this study is to compare the construction technology of rebar concrete construction. We compared the differences with Korea's construction method based on the construction books recently published in North Korea, and derived the characteristics of North and South Korea for each detailed process of reinforced concrete construction.

• The Journal of Korean Society for Radiation Therapy
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• v.26 no.2
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• pp.247-256
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• 2014

Purpose : To assess target motion during radiotherapy by quantifying daily setup errors and inter-fractional and intra-fractional movements of pancreatic fiducials. Materials and Methods : Eleven patients were treated via stereotactic body radiotherapy (SBRT) with volumetric modulated arc therapy. Bony setup errors were calculated using cone beam computed tomography (CBCT). Inter-fractional and intrafractional fiducial (seed) motion was determined via cone beam computed tomography (CBCT) projections and orthogonal fluoroscopy. Results : Using an off-line correction protocol, setup errors were 0.0 (-1.7-4.0), 0.3 (-0.5-3.0), and 0.0 (-4.1-6.6) mm for the left-right, anterior-posterior, and superior-inferior directions respectively. Random inter-fractional setup errors in the mean fiducial positions were -0.1, -1.1, and -2.3 mm respectively. Intra-fractional fiducial margins were 9.9, 7.8, and 12.5 mm, respectively. Conclusion : Online inter-fractional and intra-fractional corrections based on daily kV images and CBCT expedites SBRT of pancreatic cancer. Importantly, inter-fractional and intra-fractional motion needs to be measured regularly during treatment of pancreatic cancer to account for variations in patient respiration.

• Journal of the Korean Chemical Society
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• v.56 no.1
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• pp.115-127
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• 2012

This is a survey research which investigated perceptions of 85 elementary and secondary school science teachers on inter-disciplinary teaching in general. It is expected that the results of this survey will help to find out the necessity, the appropriate time, the proper approach and the obstacles of inter-disciplinary education. Results indicated that 49.5% of the teachers were aware of inter-disciplinary teaching and 61.2% of the teachers agreed with the necessity of implementing inter-disciplinary strategy. However, considering difficulties in objective assessment and burdens of college entrance exam preparation, they responded that inter-disciplinary teaching could be more appropriate and feasible to be implemented for lower graders at elementary schools than secondary school students. Of the answers to the integrated approaches, 57.6% of teachers chose the theme-based approach, and 16.5% chose the problem-based approach. When they chose the theme-based approach, they stated the reason of educational readiness. On the other hand, when they chose the problem-based approach, they stated the reason of educational obligation which assumes that a problem solving needs inter-disciplinary approach. The teachers also selected 'lack of knowledge on other subjects' and 'lack of time to prepare teaching materials' as major predicaments in implementing inter-disciplinary approach. This suggests that there needs a clear and specific teaching strategy along with a guidance to teaching materials for inter-disciplinary teaching.

• Journal of Korean Academy of Nursing Administration
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• v.5 no.2
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• pp.225-235
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• 1999

This study was conducted to offer a basic material for effective human resource management of nurses by studying correlations among inter-department rotation, job motivation and organizational commitment. For this study 159 nurses in a medical college hospital were surveyed. Organization Assessment Instrument(Van de Ven. 1980) and Organizational Commitment Questionnaire (Mowday, 1979) were used. SPSS was used to analyze the data. The results of this study are as follows : 1. Nurses who had been rotated to other departments showed higher motivation scores than those who had not. 2. Nurses who had been rotated also indicated higher organizational commitment scores than those who had not. 3. There was significant positive correlations among nurse's age, job motivation and organizational commitment of nurses. 4. There was significant positive correlations among nurse's experience, job motivation and organizational commitment of nurses. 5. Inter-department rotation times were significant positive correlation with job motivation. 6. "The sense of achievement perceived form performing one's duty" was the most important criteria that nurses consider in measuring their job motivation. As to the criteria for inter-department rotation, some respondents stated that it is needed when "current assignments are not suited for particular individuals" and such rotations would job motivation and elevate the morale of nurses involved." Many opposed using the rotations as a "means of reprimanding individuals." In conclusion, inter-department rotation has a positve effect on the nurse's job motivation and organizational commitment, so regular inter-department rotation have to be recommended to nurses who want rotation.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.35 no.5
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• pp.329-334
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• 2009

Objective: To evaluate the ratio between bone-contact length and inter-segmental length of the rigid fixation screw used in bilateral sagittal split ramus osteotomy (BSSRO) for mandibular setback. Material and Methods: Records of 40 patients with Class III malocclusion were selected. 20 of them had BSSRO, while the other 20 had BSSRO with maxillary LeFort I osteotomy. All of the patients had three noncompressive bicortical screws inserted at the gonial angle through transcutaneous approach. Two screws were inserted antero-posteriorly above inferior alveolar nerve and one screw was inserted below. The lengths of bone-contact and that of inter-segmental part were measured using cone-beam computed tomography. Ratio between these two measured lengths was calculated. Results: Both bone-contact and inter-segmental lengths were longer in BSSRO group than in BSSRO with maxillary LeFort I osteotomy group. Ratio of bone-contact to inter-segmental length was lower in BSSRO group than in BSSRO with Lefort I group. Both bone-contact and inter-segmental lengths were longer at the antero-superior position than at the inferior position. However, their ratio showed little difference. Conclusion: This study suggest that stability of screws in BSSRO group was greater than in BSSRO with Lefort I group. Stability of screws at the antero-superior position was greater than at the inferior position. Ratio of bone-contact to inter-segmental lengths was 0.2 in average.

• Journal of Korean Biological Nursing Science
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• v.16 no.1
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• pp.8-16
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• 2014

Purpose: This study determined the effect of inter dental brush education on the dental plaque index, and the degree of halitosis for elementary school students. Methods: The study was performed on a non-equivalent control group, with a pre-test and post-test design. The study was intended for a total of 50 students. They were divided into two groups; an experimental group of 25 students and a control group of 25 students. The experimental group participated in inter dental brush education. The education took about 20 minutes, and was provided once a week, for a total of three weeks. To quantify the effect, the two groups were compared in terms of the dental plaque index and the degree of halitosis. Results: Without inter dental brush education, or a test for homogeneity, in the sense of exact equivalence of the dental plaque index and the degree of halitosis between the experimental and the control group, was supported. (p>.799, p>.876). 1) The first hypothesis, "The experimental group, who participated in inter dental brush education, would reveal a lower dental plaque indices than the control group", was supported (t=5.78, p<.001). 2) The second hypothesis, "The experimental group, who participated in inter dental brush education, would reveal a lower degrees of halitosis than the control group", was supported (t=4.49, p<.001). Conclusion: The proposed inter dental brush education is effective in improving the dental plaque index and the degree of halitosis for elementary school students.