• Journal of Electrical Engineering and Technology
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• v.13 no.6
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• pp.2187-2195
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• 2018

In order to realize the multi-objective control of single-input multi-output nonlinear differential algebraic system (NDAS) and to improve the dynamic characteristics and static accuracy, a design method of nonlinear control with multi-objective feedback (NCMOF) is proposed, the principium of this method to arrange system poles, as well as its nature to coordinate dynamic characteristics and static accuracy of the system are analyzed in detail. Through NCMOF design method, the multi-objective control of the system is transformed into linear space, and then it is effectively controlled under the nonlinear feedback control law, the problem to balance all control objectives caused by less input and more output of the system thus is solved. Applying NCMOF design method to generator excitation system, the nonlinear excitation control law with terminal voltage, active power and rotor speed as objective outputs is designed. Simulation results show that NCMOF can not only improve the dynamic characteristics of generator, but also damp the mechanical oscillation of a generator in transient process. Moreover, NCMOF can control the terminal voltage of the generator to the setting value with no static error under typical disturbances.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.4
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• pp.65-70
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• 2020

While the demand for robots in the manufacturing industry has dramatically increased, the industrial robots' functionality is mainly determined by the effector attached to the end of their arms. They need a flexible gripping system that can act as a human hand and easily grasp a variety of objects, which requires resilient sensors. This study clarifies the electrical output characteristics of elastic tactile sensors according to contact terminals because the output characteristics of the tactile sensors vary greatly, depending on the contact material and the method of contact with the conductive wire. Our research considers the Three Roll Mill and Paste Mixer as the dispersion medium, and a nickel- and gold-plated brass electrode as the contact terminal.

• BMB Reports
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• v.39 no.6
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• pp.782-787
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• 2006

A new protein was cloned and identified as the sixth subunit of Choristoneura fumiferana origin recognition complex (CfORC6). The newly identified 43 kDa protein CfORC6 is much bigger than DmORC6 (25.7 kDa) and HsORC6 (28.1 kDa), though it's 23.85% identical to DmORC6 and 23.81% identical to HsORC6. Although the molecular weight of CfORC6 is close to ScORc6 (50 kDa), CfORC6 is only 14.03% identical to ScORC6. By alignment, it was found that the N-terminal of CfORC6 has about 30% identities with other ORC6s, but about 100aa of C-terminal of CfORC6 has no identity with other ORC6s. Like ScORC6, CfORC6 has many potential phosphorylation sites, (S/T)PXK. Like DmORC6, CfORC6 has leucine-rich region in the relevant site. Northern Blot showed that CfORC6 mRNA is about 2,000nt. Southern Blot confirmed that there is one copy of CfORC6 gene in spruce budworm genome. Western blot showed that infection of Cf124T cells with CfMNPV didn't affect the expression levels of CfORC6, at least up to 26 hr post infection.

• Proceedings of the KSME Conference
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• 2008.11b
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• pp.2489-2494
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• 2008

The two-dimensional circular cylinder freely falling in a channel has been simulated by using Immersed boundary - lattice Boltzmann method in order to analyze the characteristics of motion originated by the interaction between the fluid and the solid. The wide range of the solid/fluid density ratio has been considered to identify the effect of the solid/fluid density ratio on the motion characteristics such as the falling time, the terminal velocity and the trajectory in the vertical and horizontal directions. In addition, the effect of the gap between the cylinder and the wall on the motion of two-dimensional circular cylinder freely falling has been revealed by taking into account a various range of the gap size. The Reynolds number in terms of the terminal velocity is diminished as the cylinder becomes close to the wall at the initial dropping position, since the repulsive force induced between the cylinder and wall constrains the vertical motion. Quantitative information about the flow variables such as the pressure coefficient and vorticity on the cylinders is highlighted.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.10a
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• pp.215-216
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• 2009

By growing the capacity of container in the world, main container terminal in countries introduces the automated container equipments and try to improve the productivity for handling the container. ARMC(Automated Rail Mounted Crane) is installed in automated container terminal and expected the high efficiency of productivity by using minimum-time control method. However recently by the GREEN Port policy, high energy efficiency method for container equipments is importance issue in ports. In this paper, the 3-dimensional modelling of AMRC is discussed and the acceleration characteristics for ARMC is analyzed By using the results of this paper, the advanced controller for the crane will be developed in future.

• Journal of IKEEE
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• v.25 no.1
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• pp.201-205
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• 2021

In this paper present Low Drop-Out (LDO) regulator that improved load transient characteristics due to the push-pull detection structure. The response characteristic of the voltage delta value is improved due to the proposed push-pull sensing circuit structure between the input terminal of the LDO regulator pass transistor and the output terminal of the internal error amplifier. Voltage value has improved load transient characteristics than conventional LDO regulator. Compared to the conventional LDO regulator, it has an improved response speed of approximately 244 ns at rising time and approximately 90 ns at falling time. The proposed circuit was simulated by the samsung 0.13um process using Cadence's Specter and Virtuoso simulator.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.30A no.3
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• pp.88-94
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• 1993

In this paper, a simple Ebers-Moll Model for the heterojunction bipolar transistor is presented. Using the model structure for the npn type HBT, the current-voltage characteristics was analyzed. And from the obtained terminal currents, the Ebers-Moll equations were derived. Then substituting the physical parameters for heterojunction to those for homojunction, this model would be used to analyze the characteristics of single and/or duble heterojunction HBT's. And directly relating model parameters to device parameters, it would be also used to optimize the characteristics of HBT's. The simulated results using this model were in good agreement with experimental data.

• Journal of Hospice and Palliative Care
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• v.17 no.3
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• pp.122-133
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• 2014

Purpose: We conducted a descriptive correlational study to determine a relationship between nurses' awareness of good death and attitudes toward terminal care, which in turn could be used as basic data for improvement of the quality of terminal care at geriatric hospitals. Methods: From April 3, 2013 through April 22, 2013, data were collected from 230 nurses working at geriatric hospitals. Results: Nurses' attitudes toward terminal care showed no significant correlation with awareness of good death, but it was positively correlated with a sense of closeness, a subfactor of awareness of good death. There was negative correlation between emotions regarding a deathbed, a subfactor of attitudes of nurses in charge of terminal patients, and awareness of good death. We found positive correlation between terminal care performance and awareness of good death. Conclusion: This study warrants the need for nursing education catered to characteristics of geriatric hospitals and development of diverse intervention strategies to help them to attain a positive attitude toward death by familiarizing themselves with the concept of good death and enhancing job satisfaction.

• Journal of Hospice and Palliative Care
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• v.16 no.1
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• pp.1-9
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• 2013

Purpose: The aim of this study was to investigate nursing students' awareness of biomedical ethics and attitudes toward death of terminal patients. Methods: A structured questionnaire was developed to examine nursing students' biomedical ethics. Their attitudes toward terminal patients' death were measured by using the Collett-Lester Fear of Death Scale. Surveys were conducted with 660 nursing students enrolled at a three-year college located in Daejeon, Korea. Data were analyzed using descriptive statistics, Wilcoxon rank sum test and Kruskall Waills test. Results: Students who have experienced biomedical ethics conflicts, agreed to prohibition of cardiopulmonary resuscitation (CPR) and have no religion exhibited more negative attitudes toward death compared to students without the above characteristics. Of the participants, 81.2% answered that life sustaining treatment for terminal patients should be discontinued and 76.4% replied that CPR on terminal patients should be prohibited. The majority of the correspondents stated that the two measures above are necessary "for patients' peaceful and dignified death". Conclusion: Study results indicate the need to establish a firm biomedical ethics value to help nursing students form a positive attitude toward death. It also seems necessary to offer students related training before going into clinical practice, if possible. The training program should be developed by considering students' religion, school year, experience with biomedical ethics conflicts and opinion about CPR on terminal patients. The program should also include an opportunity for students to experience terminal patient care in advance via simulation practice on standardized patients.

• Journal of the Korean Society of Safety
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• v.22 no.4
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• pp.20-25
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• 2007

Instrument transformers are a safe measurement device designed to measure high voltage and large current. A current transformer(CT) is a type of instrument transformer designed to provide a current in its secondary winding proportional to the current flowing in its primary. It is commonly used in metering and protective relaying in the electrical power industry where it facilitates the safe measurement of large current. But, care must be taken that the secondary of a current transformer is not disconnected from its load while current is flowing in the primary, as this will produce a dangerously high voltage across the open secondary, and may permanently affect the accuracy of the transformer. Especially, industrial disaster such as an electric shock and/or a burn accident occurs occasionally by disregard of warning or attention. In this paper, we developed the detector for open of current transformer secondary terminal, and which was tested by the Korea Electrotechnology Research Institute. Test results show that Current Transformer secondary Open Detector(CTOD) interrupted within one second electronically when the 2nd terminal of current transformer opened.