• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.13 no.5
• /
• pp.70-75
• /
• 2014

Permanent magnets have recently been considered as device that can be used to control the behavior of mechanical systems. Neodymium magnets, a type of permanent magnet, have been used in numerous mechanical devices. These are permanent magnets made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. The magnetic selection, magnet core design and mechanical errors of the magnetic component can affect the performance of the magnetic force. In this study, the coercive force, residual induction, and the dimensions of the design parameters of the magnet core are optimized. The design parameters of magnet core are defined as the gap between the magnet and the core, the upper contact radius, and the lower thickness of the core. The force exercised on a permanent magnet in a non-uniform field is dependent on the magnetization orientation of the magnet. Non-uniformity of the polarization direction of the magnetic has been assumed to be caused by the angular error in the polarization direction. The variation in the magnetic performance is considered according to the center distance, the tilt of the magnetic components, and the polarization direction. The finite element method is used to analyze the magnetic force of an optimized cylindrical magnet.

• Journal of Korean Academy of Nursing
• /
• v.43 no.6
• /
• pp.714-725
• /
• 2013

Purpose: This study was done to provide fundamental data for the development of competency reinforcement programs to prevent addictive behavior in adolescents through the construction and examination of an addiction prevention core competency model. Methods: In this study core competencies for preventing addictive behavior in adolescents through competency modeling were identified, and the addiction prevention core competency model was developed. It was validated methodologically. Results: Competencies for preventing addictive behavior in adolescents as defined by the addiction prevention core competency model are as follows: positive self-worth, self-control skill, time management skill, reality perception skill, risk coping skill, and positive communication with parents and with peers or social group. After construction, concurrent cross validation of the addiction prevention core competency model showed that this model was appropriate. Conclusion: The study results indicate that the addiction prevention core competency model for the prevention of addictive behavior in adolescents through competency modeling can be used as a foundation for an integral approach to enhance adolescent is used as an adjective and prevent addictive behavior. This approach can be a school-centered, cost-efficient strategy which not only reduces addictive behavior in adolescents, but also improves the quality of their resources.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.20 no.9
• /
• pp.808-811
• /
• 2007

Aspheric glass lens have recently been used in camera phone module because they are more effective than spherical ones. In this paper, the grinding condition of the tungsten carbide molding core has been found after applying DOE to the development of the aspheric glass lens for the 3 Megapixel and 2.5x camera-phone module. Also, the ultra precision grinding process was investigated under this condition by experiment. Re-Ir coating was applied on the ground surface of the tungsten carbide molding core. The influence of Re-Ir coating on the form accuracy and surface roughness of molding core was compared and evaluated. The form accuracy and surface roughness of the molding core were improved by application of Re-Ir coating on the surface of the tungsten carbide molding core.

• Journal of Korean Academy of Nursing Administration
• /
• v.10 no.2
• /
• pp.211-218
• /
• 2004

Purpose: The purpose of this study was to examine the core competency and career commitment of the preceptors to identify utility of the preceptorship as career management program. Method: The subjects were 107 clinical nurses who were working in one university hospital composed of the head nurses(n=27), non-preceptors(n=28), new graduate nurses(n=26) and preceptors(n=26). Demographic characteristics, core competency and career commitment were measured. The core competency was evaluated by the head nurses, non-preceptors, new graduate nurses, and preceptor themselves. And the career commitment was compared between the preceptors and non-preceptors. For data analyses, percentage, mean, t-test, ANOVA were adopted with the use of SPSS WIN 10.0. Result: The results of this study showed that the core competency of the preceptors was evaluated excellently by all subjects. In three domains, there were no significant difference in role model, socialization facillitator and educator except for learning experience planning between the head nurses, non-preceptors, new graduate nurses and preceptors. The career commitment was significant difference between the preceptors and non-preceptors. Conclusions: The finding above indicated that the preceptorship utilized the improvement of the core competency and career commitment of the preceptors as career management program. therefore, continually, the effort and interest for development of the preceptorship can be a remarkable contribution for nurses' career management in nursing organization.

• Journal of Korean Academy of Nursing Administration
• /
• v.18 no.4
• /
• pp.460-473
• /
• 2012

Purpose: This study was done to provide information on issues of nursing core competencies needed in the fields of nursing practice for graduates in nursing, from the perspective of nursing managers, and to make suggestion for improving nursing education programs. Methods: Ten nursing managers participated in this study. They were in charge of clinical nursing education in the fields of nursing practice. Data were collected using focus group interviews and analyzed with the content analysis methodology of Downe - Wamboldt's. Results: Six types of nursing core competency - therapeutic nursing competency, professional nursing competency, administrative nursing competency, humanistic nursing competency, relational nursing competency, and personal nursing competency - were identified as nursing core competencies needed in the fields of nursing practice for graduates in nursing. Conclusion: Results of the study show important evidence for decision-making about nursing curriculum revision based on nursing core competency, both in the classroom and in nursing practice areas. These results should contribute to the development of evaluation indicators for nursing students or new nurses. Further research is required to measure degree of nursing core competency in graduates of nursing and to identify the effect of competency-based education for improving nursing core competency.

• JSTS:Journal of Semiconductor Technology and Science
• /
• v.12 no.3
• /
• pp.297-312
• /
• 2012

For future multi-core processors, 3D integration is regarded as one of the most promising techniques since it improves performance and reduces power consumption by decreasing global wire length. However, 3D integration causes serious thermal problems since the closer proximity of heat generating dies makes existing thermal hotspots more severe. Conventional air cooling schemes are not enough for 3D multi-core processors due to the limit of the heat dissipation capability. Without more efficient cooling methods such as liquid cooling, the performance of 3D multi-core processors should be degraded by dynamic thermal management. In this paper, we examine the architectural impact of cooling methods on the 3D multi-core processor to find potential benefits of liquid cooling. We first investigate the thermal behavior and compare the performance of two different cooling schemes. We also evaluate the leakage power consumption and lifetime reliability depending on the temperature in the 3D multi-core processor.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.22 no.12
• /
• pp.1073-1077
• /
• 2009

The iron core, which comprises the superconducting fault current limiter (SFCL) using magnetic coupling of coils, can be operated in the saturation region, especially at the initial fault period. This operation of the iron core in the saturation region deteriorates the fault current limiting operation of the SFCL. To solve the saturation problem of the SFCL using magnetic coupling of coils, the iron core with two magnetic paths, which has an air-gap in one of them, was adopted. In this paper, the hysteresis characteristics of SFCL using magnetic coupling of coils, which were wound in the iron core with two magnetic paths, were analyzed. Through comparative analysis on the hysteresis characteristics of the iron core comprising SFCL, the hysteresis characteristics of the iron core with two magnetic paths were confirmed to be kept in the non-saturation region during the fault period and thus, the effective fault current limiting operation of the SFCL using the magnetic coupling of coils could be performed.

• Journal of Energy Engineering
• /
• v.22 no.1
• /
• pp.8-16
• /
• 2013

A core catcher is considered as a promising engineered system to stabilize the molten corium in the containment during a postulated severe accident in a nuclear power plant. Conceptually, the core catcher consists of a carbon steel body, sacrificial material, protection material, and engineered cooling channel. The cooling capacity of the engineered cooling channel should be guaranteed to remove the decay heat of the molten corium. The flow in ex-vessel core catcher is a combined problem of a two-phase flow in the engineered cooling channel and a single-phase natural circulation in the whole core catcher system. In this study, the analysis of the test facility for the core catcher using the CUPID code, which is a three-dimensional thermal-hydraulic code for the simulation of two-phase flows, was carried out to evaluate its cooling capacity.

• Journal of the Microelectronics and Packaging Society
• /
• v.20 no.4
• /
• pp.69-74
• /
• 2013

In this paper, the impact of integrating large number of I/O (Input-Output) and Core power Delivery Network (PDN) on a 6 layers Flip-Chip Ball Grid Array (FCBGA) package is investigated. The impact of core induced supply noise on high-speed I/O interfaces, and high-speed I/O interface's supply noise coupling to adjacent high-speed I/O interfaces' jitter impact are studied. Concurrent stress validation software is used to induce SSO noise on each individual I/O interfaces; and at the same time; periodic noise is introduced from Core PDN into the I/O PDN domain. In order to have the maximum coupling impact, a prototype package is designed to merge the I/O and Core PDN as one while impact on jitter on each I/O interfaces are investigated. In order to understand the impact of the Core to I/O and I/O to I/O noise, the on-die noise measurements were measured and results were compared with the original PDN where each I/O and Core PDN are standalone and isolated are used as a benchmark.

• Journal of Korean Critical Care Nursing
• /
• v.9 no.2
• /
• pp.36-47
• /
• 2016

Purpose: The study examined core job characteristics and job preference to explain work performance among critical care nurses. The theoretical model was constructed based on the job characteristics model with core job characteristics as exogenous variables, and work performance and job preference as endogenous variables. Methods: A total of 228 hospital nurses participated in the study from May to September, 2015. Data were collected through structured questionnaires and analyzed using structural equation modeling. Results: The model showed a good fit to the data with $x^2/df=2.90$, goodness of fit index = .91, root mean square residual = .20, comparative fit index = .93, and incremental fit index = .93. The core job characteristics explained 64% of the variance in job preference. The core job characteristics and job preference explained 52% of the variance in work performance. Conclusions: The core job characteristics can explain the work performance among critical care nurses through job preference. Effective strategies to improve the work performance among critical care nurses should focus on the application of the core job characteristic into a productive work environment. Further studies are warranted to explore the role of job preference of critical care nurses in promoting their work performance.