• 대한간호학회지
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• 제45권1호
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• pp.139-146
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• 2015

Purpose: This study aimed to develop a "Palliative Care Professional" education program and evaluate its effects on the recognition of good death, palliative care, and the meaning of life for nurses. Methods: It was developed based on the hospice care program for volunteers being used in the Hospice Palliative Care Research Center of S University in Seoul. It was also based on the studies which investigated the educational needs of nurses in palliative care. This program consisted of 5 sessions and 16 content items for 2 weeks. A non-equivalent control group non-synchronized design was utilized and participants were assigned to the experimental group (n=42) or the control group (n=44). Results: The recognition of a good death (F=11.44, p=.001), palliative care (F=4.15, p=.045), and the meaning of life (F=5.12, p=.026) increased more significantly for participants in the experimental group than in the control group. Participants felt that they gained further knowledge in palliative patient management and refined their clinical practice. Conclusion: The results of the study indicate that this program could serve as a practical program for palliative care nursing in the nursing field and suggests that more attention should be directed to the diverse educational needs of nurses.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2000년도 추계학술대회 학술발표 논문집
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• pp.281-286
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• 2000

This paper describes a lateral guidance system of an unmanned vehicle, using a neural network model of magneto-resistive sensor and magnetic fields. The model equation was compared with experimental sensing data. We found that the experimental result has a negligible difference from the modeling equation result. We verified that the modeling equation can be used in the unmanned vehicle simulations. As the neural network controller acquires magnetic field values(B$\_$x/, B$\_$y/, B$\_$z/) from the three-axis, the controller outputs a steering angle. The controller uses the back-propagation algorithms of neural network. The learning pattern acquisition was obtained using computer simulation, which is more exact than human driving. The simulation program was developed in order to verify the acquisition of the learning pattern, learning itself, and the adequacy of the design controller. A computer simulation of the vehicle (including vehicle dynamics and steering) was used to verify the steering performance of the vehicle controller using the neural network. Good results were obtained. Also, the real unmanned electrical vehicle using neural network controller verified good results.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 추계학술대회 논문집
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• pp.190-195
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• 2001

Flow patterns are very complex and interactive between cylinders. The patterns are turbulent and non-linear caused by various factors. In this paper, flow patterns and pressure gradient around vertical cylinders were investigated by experiment. Changing gaps between cylinders the flow patterns are measured at a fixed coming velocity. Flow patterns showed very complex and closely related to the coming velocity and cylinder space. The pressure gradient around the flow field is observed by twelve hole pitot tubes and manometer. The experiment has been conducted in circulating water channel with PIV system. That can visualize flow patterns. The laser beam was used to reflect the image from particles and recorded by CCD camera. The cylinders were spaced from ID to 5D with 0.5m/sec of incoming flow velocity. The experimental results using pitot tube showed in good agreement with results of precious by others study. The results can be applied in the understanding and design of multiple pile array structures.

• 한국초전도ㆍ저온공학회논문지
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• 제5권1호
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• pp.52-55
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• 2003

For the dielectric insulation design of any high temperature superconducting (HTS) apparatus in the electrical power systems, the breakdown properties of cryogenic coolants such as $LN_2$ are an important factor of the insulating engineering. Therefore, this paper presented an experimental investigation of breakdown phenomena in $LN_2$ under AC voltage. And we studied the breakdown properties of LN2 with decreasing temperature. Also, the Weibull plots of the breakdown voltage of subcooled $LN_2$ at 65 K for the needle-plane electrode with electrode distance d= 10 mm are studied. The dependence of breakdown voltage for needle-plane and pancake coil-pancake coil electrode on temperature is illustrated. The experimental data suggested that the breakdown voltage of L$N_2$ depend strongly on the temperature of $LN_2$. The breakdown characteristics of $LN_2$ under quasi-uniform and non-uniform electrical field for temperature ranging from 77 K to 65 K were clarified.

• 콘크리트학회지
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• 제6권5호
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• pp.123-130
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• 1994

본 논문은 주변에서 손쉽게 구할수 있는 빈깡통과 플라스틱재등의 폐기물을 토목 및 건축구조물의 시공재료로서의 재활용과 부착성이 뛰어난 발포경질유레탄을 복합하여 중$\cdot$소 span의 교량에 대한 경량화를 꾀하기 위한 하나의 실험적 연구이다. 또한 기존의 현장 시공 단순화를 위해 강 콘크리트 합성 상판의 이미지와는 별도로 새로운 구조적 합리성과 재활용이라는 관점에서 연구된 것이다. 연구결과, 경질우탄 층내에 깡통을 봉입한 경우 저탄성계수인 우레탄이 변형을 흡수하기 때문에 소요의 구조특성을 확보하는 것이 가능하였고, 또한 경질우레탄의 존재로 강판 및 내부의 깡통에 방청효과와 응력전달에 유효하다는 것이 판명되었다.

• Journal of Power Electronics
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• 제10권5호
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• pp.505-517
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• 2010

In this paper, an intelligent sliding-mode speed controller for achieving favorable decoupling control and high precision speed tracking performance of permanent-magnet synchronous motor (PMSM) drives is proposed. The intelligent controller consists of a sliding-mode controller (SMC) in the speed feed-back loop in addition to an on-line trained wavelet-neural-network controller (WNNC) connected in parallel with the SMC to construct a robust wavelet-neural-network controller (RWNNC). The RWNNC combines the merits of a SMC with the robust characteristics and a WNNC, which combines artificial neural networks for their online learning ability and wavelet decomposition for its identification ability. Theoretical analyses of both SMC and WNNC speed controllers are developed. The WNN is utilized to predict the uncertain system dynamics to relax the requirement of uncertainty bound in the design of a SMC. A computer simulation is developed to demonstrate the effectiveness of the proposed intelligent sliding mode speed controller. An experimental system is established to verify the effectiveness of the proposed control system. All of the control algorithms are implemented on a TMS320C31 DSP-based control computer. The simulated and experimental results confirm that the proposed RWNNC grants robust performance and precise response regardless of load disturbances and PMSM parameter uncertainties.

• 조명전기설비학회논문지
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• 제25권7호
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• pp.83-91
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• 2011

Even if smoke, fumes, mist or dust particles are removed by electrostatic precipitators (ESPs), the occurrence of ozone, which is harmful to human body, has to be severely restricted in the indoor environments of hospitals, offices, and workshops. Therefore, the two-stage ESP generating positive corona at the ionizer is typically used because it creates less ozone than the two-stage ESP generating negative corona at the ionizer. In order to predict the collection performance and the optimal design of the two-stage ESP applied to positive high-voltage, particle concentration is experimentally investigated in this paper. In addition, particle motion within the collector section is also numerically analyzed. The positive corona discharge current of the ionizer is found to be affected by the applied voltage in the collector section but less so by the particle concentration. Particle concentration shows a minimum near the high voltage electrode of the collector section. The minimum value of the collection efficiency is almost proportional to gas velocity. When the collector length decreases, the minimum value of the collection efficiency increases. Charged particles entering the collector region are linearly deflected towards the grounded plate by an electric field. From the above experimental and numerical results, two empirical equations on the concentration ratio and the collection efficiency are derived, and are in good agreement with the experimental data.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권4호
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• pp.502-512
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• 2013

Simulations of cavitation flow and hull pressure fluctuation for a marine propeller operating behind a hull using the unsteady Reynolds-Averaged Navier-Stokes equations (RANS) are presented. A full hull body submerged under the free surface is modeled in the computational domain to simulate directly the wake field of the ship at the propeller plane. Simulations are performed in design and ballast draught conditions to study the effect of cavitation number. And two propellers with slightly different geometry are simulated to validate the detectability of the numerical simulation. All simulations are performed using a commercial CFD software FLUENT. Cavitation patterns of the simulations show good agreement with the experimental results carried out in Samsung CAvitation Tunnel (SCAT). The simulation results for the hull pressure fluctuation induced by a propeller are also compared with the experimental results showing good agreement in the tendency and amplitude, especially, for the first blade frequency.

• 한국지반공학회지:지반
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• 제9권3호
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• pp.35-48
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• 1993

본 논문은 견고한 지층위에 존재하는 불량한 연약점토와 느슨한 실트질 모래지반에 대한 기초 안정화의 보강방안으로서 석재기등 기초의 설계 시공법을 고찰하고, 광명하안현장에서 석재기둥을 설치 전, 후의 지반에 대한 현장시험을 각각 실시하여 이 공법의 개량효과를 규명한 것이다. 실험 연구 분석한 결과, 석재기등 기초 위에서의 허용지지력과 표준관입시험치는 원지반 보다 각각 3.33배 및 3.9배 증가되어 지지력이 크게 강화됨을 확인하였다. 석재기등과 기성콘크리트 말뚝 기초의 경제성을 비교 검토하여보면 석재기등이 약 35%의 공사비 절감 효과가 있는 것으로 나타난다.

• 지역사회간호학회지
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• 제31권3호
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• pp.337-347
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• 2020

Purpose: The purpose of this study was to construct the education applying Havruta's method for nursing students and to examine its effect on the communication competency, critical thinking competency, and self-leadership. Methods: A non-equivalent control group pretest-posttest design was used. The participants were 138 nursing students at two universities. The experimental group (n=70) received the education applying Havruta's method for six weeks. The study was carried out from September 23 to November 8, 2019. Data were analyzed using IBM SPSS/WIN 22.0 for the 𝑥² test, Fisher's exact test, and independent t-test. Results: The experimental group had a significant increase in communication competency (t=2.44, p=.016). However, there was no significant difference in critical thinking competency (t=1.85, p=.067), and self-leadership (t=1.78, p=.077) between the two groups. Conclusion: The education applying Havruta's method is an effective nursing education for communication competency. The result of this study could be a guide for nursing professors at the nursing education field when developing education programs that apply Habruta's method. Based on these results, future studies should be conducted to apply Habruta's teaching method to various nursing majors.