• 디지털융복합연구
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• 제15권8호
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• pp.213-224
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• 2017

본 연구는 간호학생의 간호전문직 자아개념, 비판적 사고성향, 임상실습 만족도, 임상 수행능력, 임상실습 스트레스의 관계에 대한 구조모형을 검증하고자 시도되었다. 간호대학생 227명을 대상으로 구조화된 설문지를 이용하여 자료수집 하였다. 연구결과, 간호전문직 자아개념에 비판적 사고성향, 임상실습 만족도, 임상 수행능력, 임상실습 스트레스의 직접 효과는 유의하였으며, 수행능력과 임상실습 스트레스의 간접효과도 유의하였다. 비판적 사고성향에 수행능력과 임상실습 스트레스의 직접효과는 유의하였으며, 임상실습 만족도에 임상 수행능력과 임상실습 스트레스의 직접효과도 유의하였다. 이에 따라 간호학생의 간호전문직 자아개념의 영향 요인을 고려하여 근거중심의 비판적 사고성향과 조직적이고 체계적인 결론에 도달하는 능력을 갖추기 위해 다양한 교수법 적용과 교육환경 등 다각적인 변화와 임상 수행능력과 만족도를 향상시키고 임상실습 스트레스 줄일 수 있는 중재 프로그램 개발과 적용이 필요하다고 사료된다.

• Journal of Computing Science and Engineering
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• 제5권2호
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• pp.121-130
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• 2011

Recent research indicates that transient errors will increasingly become a critical concern in microprocessor design. As embedded processors are widely used in reliability-critical or noisy environments, it is necessary to develop cost-effective fault-tolerant techniques to protect processors against transient errors. The register file is one of the critical components that can significantly affect microprocessor system reliability, since registers are typically accessed very frequently, and transient errors in registers can be easily propagated to functional units or the memory system, leading to silent data error (SDC) or system crash. This paper focuses on investigating the impact of register file soft errors on system reliability and developing cost-effective techniques to improve the register file immunity to soft errors. This paper proposes the register vulnerability factor (RVF) concept to characterize the probability that register transient errors can escape the register file and thus potentially affect system reliability. We propose an approach to compute the RVF based on register access patterns. In this paper, we also propose two compiler-directed techniques and a hybrid approach to improve register file reliability cost-effectively by lowering the RVF value. Our experiments indicate that on average, RVF can be reduced to 9.1% and 9.5% by the hyperblock-based instruction re-scheduling and the reliability-oriented register assignment respectively, which can potentially lower the reliability cost significantly, without sacrificing the register value integrity.

• Smart Structures and Systems
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• 제1권1호
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• pp.63-82
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• 2005

This paper introduces a technology for robust and low maintenance cost sensor network capable to detect accelerations below a micro-g in a wide frequency bandwidth (above 1,000 Hz). Sensor networks with such performance are critical for navigation, seismology, acoustic sensing, and for the health monitoring of civil structures. The approach is based on the fabrication of an array of high sensitivity accelerometers, each utilizing Fabry-Perot cavity with wavelength-dependent reflectivity to allow embedded optical detection and serialization. The unique feature of the approach is that no local power source is required for each individual sensor. Instead one global light source is used, providing an input optical signal which propagates through an optical fiber network from sensor-to-sensor. The information from each sensor is embedded onto the transmitted light as an intrinsic wavelength division multiplexed signal. This optical "rainbow" of data is then assessed providing real-time sensing information from each sensor node in the network. This paper introduces the Fabry-Perot based accelerometer and examines its critical features, including the effects of imperfections and resolution estimates. It then presents serialization techniques for the creation of systems of arrayed sensors and examines the effects of serialization on sensor response. Finally, a fabrication process is proposed to create test structures for the critical components of the device, which are dynamically characterized.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.87-89
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• 2002

This paper presents a new approach using an Improved branch exchange (IBE) technique to maximize the voltage stability as well as loss minimization in radial power systems. A suitable voltage stability index (VSI) for optimal routing algorithm is developed using novel methods both a critical transmission path based on a voltage phasor approach and an equivalent impedance method. Furthermore, the proposed algorithm can automatically detect the critical transmission path to be reached to a critical load faced with voltage collapse due to additional real or reactive leading. To develop an effective optimization technique, we also have applied a branch exchange algorithm based on a newly derived index of loss change. The proposed IBE algorithm for VSI maximization can effectively search the optimal topological structures of distribution feeders by changing the open/closed states of the sectionalizing and tie switches. The proposed algorithm has been tested with the various radial power systems to show its favorable performance.

• 한국간호교육학회지
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• 제14권1호
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• pp.55-62
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• 2008

Purpose: The purpose of this study was to compare and analyze learning satisfaction, critical thinking disposition, learning attitude and motivation between Problem Based Learning and Subjective Based Learning. Method: The research was performed between September and December, 2005 and 2006, including the development of PBL packages and their application. Statistical analysis was performed using SPSS 13.0. An independent t-test, $X^2$-test, and Pearson Correlation Coefficient were performed to compare the two groups on each of the measures. Result: There were no statistically significant differences among participants in the two groups according to general characteristics. However, The PBL group scored significantly higher on learning satisfaction, critical thinking disposition, learning attitude and motivation. Conclusion: This study contributes to our understanding of student outcomes of the PBL approach compared to the SBL approach. PBL needs to be extended over individual nursing courses for the unification of related courses and a curriculum.

• 한국간호교육학회지
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• 제18권1호
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• pp.43-52
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• 2012

Purpose: The purpose of the study was to discover long-term effects of Problem-based learning (PBL) and Simulation Problem-based learning (S-PBL) on critical thinking, problem solving abilities, learning attitude, motivation, and learning satisfaction among nursing students at Cheju Halla College. These students were taking problem based learning and simulation as a problem based learning method with an integrated curriculum. Methods: This study used a pretest-posttest with repeated measure design. Data was collected using convenience sampling from the beginning of the 1st semester to the end of the 2nd year when the PBL and S-PBL were completed by those who were enrolled in the integrated nursing curriculum. One-hundred eighty-three surveys were collected and analyzed during the repeat data collection. Results: There we restatistically significant differences of critical thinking, problem solving abilities, learning attitude, motivation and satisfaction post PBL and S-PBL. Conclusion: This study contributes to our understanding of outcomes from the PBL and S-PBL approach. The students undertaking PBL and S-PBL demonstrated that they developed a more positive attitude about their educational experience. In addition, students' tendency to think critically and problem solve improved through the use of the PBL and S-PBL approach.

• 대한토목학회논문집
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• 제8권2호
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• pp.1-11
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• 1988

층상구조(層狀構造)로 이루어진 아스팔트 포장도로(鋪裝道路)의 안전성(安全性)은 교통하중(交通荷重)과 아스팔트 콘크리트의 층별강도(層別觸强度)와의 함수관계(函數關係)에 의하여 평가된다. 본(本) 논문(論文)은 아스팔트 포장도로(鋪裝道路)의 신뢰도(信賴度)를 고찰(考察)하기 위하여 확률론적(確率論的) 방법(方法)을 적용시켰는데 이에 사용(使用)된 자료(資料)들은 현장(現場) 또는 문헌(文獻)으로부터 수집하였다. 각층(各層)의 임계인장강도(臨界引張强度)를 목표신뢰도(目標信賴度)에 근거(根據)하여 시뮬레이션 방법(方法)으로 산정(算定)하였는데 이 값을 실제로 표면(表面)에 손상(損傷)이 일어난 시료강도(試料强度)와 비교(比較), 고찰(考察)하였다. 확률론적방법(確率論的方法)으로 산정(算定)한 임계강도(臨界强度)는 현행(現行)의 도로조건(道路條件)에 적합(適合)한 값임을 알 수 있었다.

• Journal of Electrical Engineering and Technology
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• 제13권3호
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• pp.1326-1336
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• 2018

This paper proposes a numerical approach to predict the critical flashover voltages of air gaps under lightning impulses. For an air gap, the impulse voltage waveform features and electric field features are defined to characterize its energy storage status before the initiation of breakdown. These features are taken as the input parameters of the predictive model established by support vector machine (SVM). Given an applied voltage range, the golden section search method is used to compute the prediction results efficiently. This method was applied to predict the critical flashover voltages of rod-rod, rod-plane and sphere-plane gaps over a wide range of gap lengths and impulse voltage waveshapes. The predicted results coincide well with the experimental data, with the same trends and acceptable errors. The mean absolute percentage errors of 6 groups of test samples are within 4.6%, which demonstrates the validity and accuracy of the predictive model. This method provides an effectual way to obtain the critical flashover voltage and might be helpful to estimate the safe clearances of air gaps for insulation design.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권12호
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• pp.3398-3415
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• 2023

Internet-of-Things (IoT) is an emerging technology that interconnects millions of small devices to enable communication between the devices. It is heavily deployed across small scale to large scale industries because of its wide range of applications. These devices are very capable of transferring data over the internet including critical data in few applications. Such data is exposed to various security threats and thereby raises privacy-related concerns. Even devices can be compromised by the attacker. Modern cryptographic algorithms running on traditional machines provide authentication, confidentiality, integrity, and non-repudiation in an easy manner. IoT devices have numerous constraints related to memory, storage, processors, operating systems and power. Researchers have proposed several hardware and software implementations for addressing security attacks in lightweight encryption mechanism. Several works have made on lightweight block ciphers for improving the confidentiality by means of providing security level against cryptanalysis techniques. With the advances in the cipher breaking techniques, it is important to increase the security level to much higher. This paper, focuses on securing the critical data that is being transmitted over the internet by PRESENT using key-based dynamic S-Box. Security analysis of the proposed algorithm against other lightweight block cipher shows a significant improvement against linear and differential attacks, biclique attack and avalanche effect. A novel key-based dynamic S-Box approach for PRESENT strongly withstands cryptanalytic attacks in the IoT Network.

• International Journal of Internet, Broadcasting and Communication
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• 제16권3호
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• pp.146-157
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• 2024

Despite numerous air mattresses marketed to prevent Pressure Ulcers (PU), none have fully succeeded due to residual pressure surpassing critical levels. We introduces an innovative medical bed system aiming at complete PU prevention. This system employs a unique 4-bar link mechanism, moving keys up and down to manage body pressure. Each of the 17 keys integrates a sensor controller, reading pressure from 10 sensors. By regulating motor input, we maintain body pressure below critical levels. Keys are equipped with a servo drive and sensor controller, linked to the main controller via two CAN series. Using fuzzy or PI/IP controllers, we adjust keys to minimize total error, dispersing body pressure and ensuring comfort. In case of controller failure, keys alternate swiftly, preventing ulcer development. Through experimental tests under varied conditions, the fuzzy controller with tailored membership functions demonstrated swift performance. PI control showed rapid convergence, while IP control exhibited slower convergence and oscillations near zero error. Our specialized medical robot bed, incorporating 4-bar links and pressure sensors, underwent testing with three controllers-fuzzy, PI, and IP-showcasing their effectiveness in keeping body pressure below critical ulcer levels. Experimental results validate the proposed approach's efficacy, indicating potential for complete PU prevention.