• Journal of Korean Academy of Nursing
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• v.11 no.1
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• pp.29-44
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• 1981

Nursing role tends to be more complex then before because of the increased number of health professionals and of the health needs of patient. Accordingly, nursing role expectations are various and sometimes conflict by its role set. There are various literatures on role conflict of nurses and discussed how to eliminate the conflict in order to improve nursing service particularly in the hospital organization. This study was designed to determine if role conflict exist among nurses who work in a hospital and if so what resolution were most frequently selected by the nurses to the role conflict. The study population was fifty six registered nurses of K university hospital. The fifty six was defined and selected by nonproportional stratified sampling method to obtain subjects who are from uniform role set. A questionnaire, a list of role connect, stimulated by the literature review, knowledge based on several years' experience in nursing was formulated by the author and administered to the study population. The questionnaire included twenty nine closed question items of role conflict and classified according to the intra sender conflict, intersender conflict, person conflict and interperson conflict. The response choices to the questions range on a scale continuum with degrees of conflict from one to five: never - 0, seldom - 1, occasionally - 2, frequently - 3, and mostly -4. Per cent, means, standard deviation, and x² -test were used to analyze data. The findings of the study could be summarized as follows. 1. General characterstics of the study population: Most of the population were between the age of 22-27 and are not married. 2. Analysis of Role conflict Existence of Role conflict of nurses was found by the total mean conflict score, 2.06. Inter Sender Role conflict revealed the most high mean conflict score and the lowest one was inter person role conflict. Among the five role senders of nurses: Physician, patient and hi9 family, peer and superior, nursing students and hospital administrator, nurses showed the highest conflict mean score for physicians and the lowest score for Nursing student. 3. Analysis of role conflict resolution. Compromise through discussion with the role sender was the most frequently selected method by the respondents. The result also showed that the respondents tend to resolve the conflicting situation created by patient or his family by persuation. On the o thor hand, Avoidance and ignorance was frequently chosen for the conflicting role expectations from the hospital administrator.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.1A
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• pp.104-112
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• 2005

Some design techniques for high speed and low power pipelined 8-bit ADC are described. To perform high-speed operation with relatively low power consumption, open loop architecture is adopted, while closed loop architecture (with MDAC) is used in conventional pipeline ADC. A distributed track and hold amplifier and a cascading structure are also adopted to increase the sampling rate. To reduce the power consumption and the die area, the number of amplifiers in each stage are optimized and reduced with proposed zero-crossing point generation method. At 500-MHz sampling rate, simulation results show that the power consumption is 210mW including digital logic with 1.8V power supply. And the targeted ADC achieves ENOB of about 8-bit with input frequency up to 200-MHz and input range of 1.2Vpp (Differential). The ADC is designed using a $0.18{\mu}m$ 6-Metal 1-Poly CMOS process and occupies an area of $900{\mu}m{\times}500{\mu}m$

• International Journal of High-Rise Buildings
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• v.3 no.4
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• pp.255-271
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• 2014

A method of smart system identification of super high-rise buildings is proposed in which super high-rise buildings are modeled by a shear-bending system. The method is aimed at finding the story shear and bending stiffnesses of a specific story only from the horizontal floor accelerations. The proposed method uses a set of closed-form expressions for the story shear and bending stiffnesses in terms of the limited floor accelerations and utilizes a reduced shear-bending system with the same number of elements as the observation points. A difficulty of prediction of an unstable specific function in a low frequency range can be overcome by introducing an ARX model and discussing its relation with the Taylor series expansion coefficients of a transfer function. It is demonstrated that the shear-bending system can simulate the vibration records with a reasonable accuracy. It is also shown that the vibration records at two super high-rise buildings during the 2011 Tohoku (Japan) earthquake can be simulated with the proposed method including a technique of inserting degrees of freedom between the vibration recording points. Finally it is discussed further that the time-varying identification of fundamental natural period and stiffnesses can be conducted by setting an appropriate duration of evaluation in the batch least-squares method.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.32 no.12
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• pp.924-930
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• 2008

Immersed boundary method (IBM) is the most effective method to overcome the disadvantage of LBM (Lattice Boltzmann Method) related to the limitation of the grid shape. IBM also make LBM possible to simulate flow over complex shape of obstacle without any treatment on the curved boundary. In the research, IBLBM was used to perform LBM simulation of a flow over a moving circular cylinder to determine the flow feature and aerodynamics characteristic of the cylinder. To ascertain the applicability of IBLBM on the moving obstacle near the wall, it was first simulated for the case of the flow over a fixed circular cylinder in a channel and the results were compared against the solution of moving cylinder in the channel using IBLBM. The simulations were performed in a moderate range of Reynolds number at each moving cylinder to identify the flow feature and aerodynamic characteristics of circular cylinder in a channel. The drag and lift coefficients of the cylinder were calculated from the simulation results. We have numerically confirmed that the critical Reynolds number for vortex shedding is Re=50 and the result is the same as the case of fixed cylinder. As the cylinder approaching to a wall (${\gamma}<2.5$), the 2nd vortex is developed by interacting with the wall boundary-layer vorticity. When the cylinder is very closed to the wall, ${\gamma}<0.6$, the cylinder acts like blockage to block the flow between the cylinder and wall so that the vortex developed on the upper cylinder elongated and time averaged lifting and drag coefficients abruptly increase.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.10 s.89
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• pp.944-951
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• 2004

In this paper, we proposed the method of the characteristic impedance and effective dielectric constant calculations of the shielded microstrip line with ground aperture using conformal mapping method. This method has advantages that can calculate the transmission parameters without using any other numerical method because present the closed form equations. First of all, we supposed the signal propagate with the microstrip mode(Quasi-TEM) and calculated the capacitance divide by three sections and calculated the characteristic impedance and effective dielectric constant using calculated capacitances. From the HFSS simulation result, calculated result was very similar to the simulation result within the five percent error range.

• Journal of the Korean Home Economics Association
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• v.31 no.1
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• pp.137-151
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• 1993

This study presents an appraisal of current theorizing process through the review of family studies. Also it shows the outlines of five sociological general theories and how to apply them to family studies. The field of family studies entered a new stage in the middle of the twentieth century. Especially the decade of the 1970s was a period of rapid development in family theories because middle-range theories were developed. Currently identified major conceptual frameworks of family studies are five sociological general theories. Exchange theory was utilized in several studies and the problems could have been conceptualized in a way that would have tested the general theory of rewards, costs, and profits, but in most instances the theory was developed at a limited substantive level. Symbolic interactionism is the most useful in understanding precarious human relationships, such as courtship processes, intergenerational relationships family roles, and powers. General systems theory have been provided generalizaitons useful for understanding the characteristics of the family systems and also useful in describing the interactions with the environment, and the functioning of a family along a continuum of open to closed. Conflict theorists point that the basic units of society comprise all persons who share a sense of status equality and there are continual struggles in society for various goods. This theory attemps to account for the development within the family of norms of equity, or fairness. Phenomenology becomes available when we cease to treat an object as real, and begin to treat the object as meant, as intended, as it appears. Therefore the formulation of an adequate and complete description of family is important. Family theorists must be urged to do a number of things including continuing to improve existing theory and continuing to develop metatheory and methodologies of building theory.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.4
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• pp.333-336
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• 2017

A speaker diaphragm generates a divided vibration. The influence of the break-up mode is sufficient to cause a shape change in the diaphragm. In this paper, is widely used in ultra-thin multi-media devices, including smart phones is the advance guard of the IT sector, the micro-speakers and its target. Micro-speakers are different from general speakers. The plate has structural form and space constraints. In particular, they utilize a closed-type drive space. It is difficult to provide cooling for the auxiliary suspension structure because of the heat generated in the moving coil. The present study considered the relationship between the break-up mode and the heat transfer of the diaphragm. An experiment was conducted in two stages to compare the embodiment of the break-up mode and heat transfer in a certain frequency range. The changes in the heat were determined through measurements and thermal imaging of the break-up mode. The break-up mode tendency of the diaphragm could be rapidly predicted based on the imaging results using the thermal imaging camera. This will help in the optimal design of micro-speakers.

• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.15-20
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• 2015

To examine the magnetic shielding effect for carbon-based materials at extremely low frequencies (60 Hz), two types of carbon black (Super-P and Denka Black) and a natural graphite (HC-198) were mixed into organic binder at 10 wt.% to produce a coating solution, and a powder coating with varying thickness was applied on an aluminum disk measuring 88 mm in radius. A device was developed to measure the sheielding effect at extremely low frequencies. A closed circuit was achieved by connecting a transformer and a resistor. The applied voltage was fixed at 65 V, and the magnetic field was measured to being the range of 4.95~5.10 mG. Depending on the thickness of the coating layer, the magnetic field showed a decreasing trend. The maximum decrease in the magnetic field of 38.3% was measured when natural graphite was coated with specimens averaging $455{\mu}m$. This study confirmed that carbon-based materials enable magnetic shielding at extremely low frequencies, and that the magnetic shielding effect can be enhanced by varying the coating thickness.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.12
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• pp.2518-2524
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• 2009

This paper presents the backplane effects due to a rectangular aperture size for two-wire transmission line with equal line length crossing the changeable rectangular aperture in an infinite ground backplane. It is used to determine the characteristics of the backplane insertion loss of the transmission line from the load section in accordance with the backplane aperture size. The results show that the insertion gain and insertion loss are obtained for the specific frequency range when the transmission line is closed to the backplane aperture size. The insertion loss is decreased that the aperture horizontal length and vertical length is more than a=50 mm and b=20 mm. The measurements of insertion loss are performed to verify the theoretical analysis.

• Journal of Power Electronics
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• v.14 no.3
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• pp.444-457
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• 2014

This paper presents the design and realization of a digital PV simulator with a Push-Pull Forward (PPF) circuit based on the principle of modular hardware and configurable software. A PPF circuit is chosen as the main circuit to restrain the magnetic biasing of the core for a DC-DC converter and to reduce the spike of the turn-off voltage across every switch. Control and I/O interface based on a personal computer (PC) and multifunction data acquisition card, can conveniently achieve the data acquisition and configuration of the control algorithm and interface due to the abundant software resources of computers. In addition, the control program developed in Matlab/Simulink can conveniently construct and adjust both the models and parameters. It can also run in real-time under the external mode of Simulink by loading the modules of the Real-Time Windows Target. The mathematic models of the Push-Pull Forward circuit and the digital PV simulator are established in this paper by the state-space averaging method. The pole-zero cancellation technique is employed and then its controller parameters are systematically designed based on the performance analysis of the root loci of the closed current loop with $k_i$ and $R_L$ as variables. A fuzzy PI controller based on the Takagi-Sugeno fuzzy model is applied to regulate the controller parameters self-adaptively according to the change of $R_L$ and the operating point of the PV simulator to match the controller parameters with $R_L$. The stationary and dynamic performances of the PV simulator are tested by experiments, and the experimental results show that the PV simulator has the merits of a wide effective working range, high steady-state accuracy and good dynamic performances.