• Journal of the Korean Society of Industry Convergence
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• v.26 no.6_2
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• pp.1127-1134
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• 2023

In this paper, we proposes a study on air gap control for magnetic levitation of transverse flux permanent magnet electromagnets. In general, mechanical systems have a high failure rate of bearings. Bearings in particular are problematic because they have high surface wear rate and degradations. To solve this problem, replacing the bearing with a magnetic levitation electromagnet system can provide lightweight and efficiency improvements. However, precise air gap control is essential to control the magnetic levitation electromagnet system. Therefore, in this paper, we identify the instable cause of gap control through a mathematical modeling and verify through experiment a control algorithm that can use compensation.

• The Korean Society of Law and Medicine
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• v.12 no.2
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• pp.219-263
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• 2011

"Wrongful conception" is a medical malpractice claim in which the plaintiff is the parent of a normal, healthy infant whose conception was unplanned and unwanted. Medical malpractice in wrongful conception can be the result of a failure to provide informed consent to a patient, failure to properly perform a surgery, or a physician's negligent handling of a patient's problems. In the concrete, wrongful conception cases fall into two categories; those involving pre-conception negligence, such as a failed contraceptive, sterilization or failing of the controlling of embryo-number on the IVF, and those involving post-conception negligence, such as a failure to diagnose a pregnancy or to perform an abortion procedure. In addition, Medical malpractice can be the result of a failure to provide informed consent to a patient. When bad results occur by medical malpractice or failure to provide informed consent to a patient, the range of recovery of damages is decided by a traditional civil liability law. However the calculation of damages for wrongful conception is not easy because the high value of life is included in that case. So many courts opinions in foreign country and Seoul High Court decision in 1996 allow damages for the pregnancy, birthing process and sterilization costs, but refuses to allow damages for child rearing expenses. As to the range of recovery of damages for wrongful conception, one approach says that to allow damages in a suit such as this would mean that the physician would have to pay for the fun, joy and affection which plaintiff will have in the rearing and educating of the plaintiff's baby. To allow such damages would be against the dignity of the baby based on article 10 of the Constitution. However another approach says that damages are recoverable for all expenses related to child birth as well as for child rearing costs. Because the damages that the parents should bear a burden to the tort damage done is not a baby itself but child rearing costs. In other words, although the baby is healthy or not, economic burden of the parents can not be disregard. And denial of compensation for costs of child rearing may invalidate the role of liability law, grant the physician with a exemption certificate of liability. As a result, the medical field of procreation can be easily isolated from a liability of reparation. Therefore, on the liability law like the other medical malpractice action, parents who became pregnant or gave a birth by physician, wrongfully performed sterilization operation, etc. should be compensated for all damages relevant to unplanned and unwanted conception or birth as well as costs of child rearing.

• Journal of the Korea Safety Management & Science
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• v.10 no.3
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• pp.29-33
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• 2008

According to statistics released by the Ministry of Labor for the past 6 years, work-related accidents in the construction industry have been on the continued increase, resulting in social and economic losses that are difficult to determine at an exact amount. However, the number will likely get much bigger if unreported cases are included, considering the fact that the aforementioned statistics are based soley on the applications filed with Korea Workers' Compensation and Welfare Service. The practice of businesses choosing not to report and dealing with industrial accidents in an unauthorized manner is defined as "concealment of industrial accident". The reason the employers tend to engage in the concealment practice even at their huge cost is a "pre-qualification" scheme for the applicants in the government procurement process. Under the pre-qualification scheme, the applicants with a high rate of industrial accidents receive a low grade and become less attractive candidates in the procurement process, thus losing an opportunity to win a contract. Such failure relates directly to the fate of business organizations, to survive or not. That is why they are making all-out efforts to obtain a high grade in the pre-qualification evaluation. With regard to the accident-concealment problem, the following can be mentioned as preventive measures: (1) To exclude a rate of industrial accidents from the pre-qualification scheme; (2) To strengthen the institution of imposing penalties on the occurrence of industrial accidents; (3) To introduce private insurance system to the current industrial accident compensation insurance; and (4) To give non-recognition treatment to industrial accidents that were not reported upon occurrence. In conclusion, the concealment problem can be resolved if the aforementioned measures are to be taken continuously along with corrective measures against institutional deficiencies.

• Journal of the Korean Society for Nondestructive Testing
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• v.26 no.5
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• pp.329-335
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• 2006

It is necessary to study on the stress concentration experimentally, which is the main reason to avoid mechanical dilapidation and failure, when designing a mechanical structure. Stress concentration factor of a specimen of cantilever beam with a circular hole in the center was measured using both strain gage and photoelastic methods in this paper. In strain-gage measurement, three strain gages along the line near a hole of the specimen were installed and maximum strain was extrapolated from three measurements. In photoelastic measurement, two methods were employed. First, the Babinet-Soleil compensation method was used to measure the maximum strain. Secondly, photoelastic 4-step phase shilling method was applied to observe the strain distribution around the hole. Measurements obtained by different experiments were comparable within the range of experimental error.

• The Korean Journal of Air & Space Law and Policy
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• v.20 no.1
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• pp.211-253
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• 2005

Recently, the Korean Supreme Court released two important decisions concerning damages for the pain and suffering from Aircraft noise. The local people who are living near the Air Force practice site at Maehyang-ri and the Kimpo International Airport brought lawsuits against the Korean government requesting damages for their financial loss from the severe noise and the damages for their pain and suffering. Plaintiffs alleged that they suffered physical malfunctions, extreme disturbances and the reduction of property values from the extreme noises which were daily repeated. District Court of Seoul Province did not allow plaintiffs all but the damages for pain and suffering. Plaintiffs could not prove the causation between their financial loss and the noise. The Supreme Court confirmed the lower court's decision. Article V of the National Compensation Act (analogous to the Federal Tort Claims Act of the USA) reads, "the government shall be liable for any loss caused by the defect on establishment or maintenance of public facilities." In the two cases, the major issue was whether the government's establishment or maintenance of Air Force practice site and the airport was defective because they caused serious noise to surrounding neighbors. Previously, the Supreme Court interpreted the clause "defect on establishment or maintenance of public facilities" as failure of duty to provide safety measures to the degree generally required to ordinary manager. However the Court at this time interpreted differently that the defect could be found if the facility caused to any person loss to the degree intolerable. In the two cases the Court confirmed the lower court's finding that noise level at the site was severe enough to be intolerable. This standard is based on the severity of the loss rather than the failure of duty. It became easier for plaintiffs to prove the cause of action under this interpretation. The consequence of the ruling of these two cases is 'rush to the courtroom' by the local people at similar situations. The ruling of these two cases was not appropriate both in theory and in consequence. The Korean tort system is basically based on the theory of negligence. Strict liability is exceptional only when there is special legislation. The Court created strict liability rule by interpreting the Art. V of the National Compensation Act. This is against the proper role of the court. The result of the cases is also dismal. The government was already sued by a number of local people for damages. Especially the Department of Defense which is operating many airports nationwide has financial hardship, which will cause downsizing military practice by the Air Force in the long run, This is no good to anyone. Tens of millions of dollars which might be used for compensation might be better used to prevent further noise problem surrounding airports.

• Proceedings of the Korean DIstribution Association Conference
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• 2006.02a
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• pp.187-227
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• 2006

To attain competitiveness in the severe competition of retailing, retailing firm like Aekyung department store composites multiplex entertainment shopping mall with other firms as key tenants like LG supermarket, Books Libro, and CGV. But in multiplex entertainment shopping mall customers who have experienced a service failure in key tenant's shops usually ask a compensation of service failure to the lessor like department store. Even though customers of multiplex entertainment shopping mall know that key tenants use different service strategy, personnel management system and operation system and so on, they do not rare of it. Why they do that? How can we explain this situation? This study explains customer's complaining behaviors in multiplex entertainment shopping mall using attribution theory and justice theory. The study presents a comprehensive model about the effects of the perceived attribution and fairness on customer satisfaction and suggests practical implications for retailing firms composing multiplex entertainment shopping mall.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.24 no.5
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• pp.135-140
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• 2024

DC capacitors used in PV inverters have a relatively short lifespan compared to other power semiconductor devices and have a failure rate of 60%, making them the most vulnerable among the elements that make up a power conversion system (PCS). In addition, the lifespan of the capacitor varies depending on environmental factors, greatly affecting the lifespan and operating conditions of PV inverters and PV power generation systems. Therefore, research is needed on the development of inverter deterioration diagnostic sensor technology optimized for building-integrated and general PV power generation systems and the development of bypass compensation capacitor modules that can maintain the efficiency of the inverter in the event of a failure. Based on this research, the DC capacitor deterioration diagnosis module inside the PV inverter measures the capacity of the actual internal components and can check the trend information of the deterioration state in the long term, enabling rapid response to fires. In addition, it seeks to improve the efficiency of power generation facilities and reduce carbon emissions, and prevents electrical fires, allowing the PV power generation system to be maintained in optimal condition.

• Journal of the Korean Applied Science and Technology
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• v.35 no.4
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• pp.1120-1133
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• 2018

The purpose of this study is to validate the failure attribution factors affecting emotional changes after a failed service by local restaurant users, and the relapse effects of the perceived failure of a customer's brand relationship. In this study, the implications of this study can be divided into the null theory and the homogenous theory, in which the study of the relationship between individual belief that influences the null theory and the post-gender emotional response is minimal. The independence of the crash response (angerous VS compassion) has been equally validated as building a belief-gathering-emotion three-step model. First, emotional BRQ (intimate and love) has a reduction effect on controllable geeks, and behavioral BRQ (relative existence) has an extended effect on controllable geeks. From a management perspective, restaurant managers should be less aware of the repeatability of a customer's service failure and call for customer sympathy. Integratedly, restaurant managers must control the customer's perception of service failure and restore the impact of the customer's BRQ on emotional reactions. A variety of service recovery measures should be established and the cerumen should be controlled. In addition, since BRQs have different effects on anger and sympathy (extended VS), different service failure recovery plans should be presented depending on the characteristics of the customer BRQ. For example, measures such as monetary compensation or fair dealing, emotional distribution to close and loving customers, and persuasion of reciprocal benefits to interdependent customers should be developed according to circumstances. This study explored the effectiveness of the geeks after a service failure and has limitations that do not take into account the various regulatory factors in the BRQ-return-Empression process. Thus, in further studies, the effects of adjusting service failure strength should be considered and a more complete model should be built.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.11
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• pp.1092-1098
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• 2007

A mobile robot localization problem can be classified into following three sub-problems as an observation likelihood model, a motion model and a filtering technique. So far, we have developed the range sensor based, integrated localization scheme, which can be used in human-coexisting real environment such as a science museum and office buildings. From those experiences, we found out that there are several significant issues to be solved. In this paper, we focus on three key issues, and then illustrate our solutions to the presented problems. Three issues are listed as follows: (1) Investigation of design requirements of a desirable observation likelihood model, and performance analysis of our design (2) Performance evaluation of the localization result by computing the matching error (3) The semi-global localization scheme to deal with localization failure due to abrupt wheel slippage In this paper, we show the significance of each concept, developed solutions and the experimental results. Experiments were carried out in a typical modern building environment, and the results clearly show that the proposed solutions are useful to develop practical and integrated localization schemes.

• Nuclear Engineering and Technology
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• v.49 no.2
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• pp.442-449
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• 2017

Risk management of the Fukushima Daiichi Nuclear Power Station decommissioning is a great challenge. In the present study, a risk management framework has been developed for the decommissioning work. It is applied to fuel assembly retrieval from Unit 3 spent fuel pool. Whole retrieval work is divided into three phases: preparation, retrieval, and transportation and storage. First of all, the end point has been established and the success path has been developed. Then, possible threats, which are internal/external and technical/societal/management, are identified and selected. "What can go wrong?" is a question about the failure scenario. The likelihoods and consequences for each scenario are roughly estimated. The whole decommissioning project will continue for several decades, i.e., long-term perspective is important. What should be emphasized is that we do not always have enough knowledge and experience of this kind. It is expected that the decommissioning can make steady and good progress in support of the proposed risk management framework. Thus, risk assessment and management are required, and the process needs to be updated in accordance with the most recent information and knowledge on the decommissioning works.