• Korean Journal of Social Issues
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• v.18 no.1
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• pp.33-56
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• 2017

이 연구에서는 서구와 한국에서의 신자유주의화에 대한 기존의 연구성과들에 기반하여 한국적 신자유주의의 특징을 규명하고, 이명박 정부 이후의 구체적인 정책 변화를 검토하여 국가의 정책이 사회적 불평등에 어떠한 영향을 미쳐 왔는지를 확인하고자 한다. 전체적으로 이 연구가 던지는 질문은 다음과 같다: "국민경제는 계속 성장하고 있다는데, 나는 왜 먹고살기가 더욱 어려워지는가?"라는 질문에 대해 어떻게 대답할 것인가? 이 연구는 이론적인 차원에서 이에 대한 대답은 '신자유주의적 금융화의 진전'이라는 현상과 관련하여 설명되어야 한다는 관점에서 출발한다. 이러한 방식의 설명을 위해 이 글에서 파악하고자 하는 내용은 다음과 같다: 한국에서 신자유주의화 또는 금융화가 전개되는 독특한 양식은 무엇인가? '보수정부' 9년간의 사회경제정책은 이전 시기에 비해 어떤 특징을 나타내는가? 그리고, 이 시기에 한국사회의 사회적 불평등의 정도는 실제로 어떻게 변화하였는가? 글은 신자유주의에 대한 새로운 이론이나 금융화 및 불평등에 대한 새로운 경험적 자료를 제시하기 보다는, 금융화와 불평등에 대한 기존의 논의들을 살펴보고 한국의 신자유주의 및 금융화가 진화해 온 방식과 그 지형도를 그리는 것을 목표로 한다. 그리고 이러한 작업을 통해 향후 기대되는 연구의 방향을 제시하고자 한다. 연구는 첫째로 지난 9년간 전개된 금융정책은 금융이 산업을 지배한다기보다는 오히려 정 반대의 과정으로 진행되도록 했다는 점을 제시할 것이다. 또한, '일하는 복지'라는 사회복지정책 의제와 금융장치의 결합을 통해 개개인의 금융활동에 대한 의존을 심화시켰다는 점을 제시할 것이다. 이러한 정책적 변화들은 곧 물질적인 평등뿐만 아니라, '사회적 권리'로서의 평등을 악화시켰다고 관찰된다.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.6
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• pp.514-524
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• 2001

Conventional average power theory has been used to design and control active power filters But compensating reference currents of active power filters calculated by conventional average power theory are definitively influenced by three phase source voltage conditions such as unbalance or distortion. This paper presents a new average power algorithm for active power filters which can detect symmetrically equally active or fundamental reactive currents in each phase based on decomposition of fundamental reactive component and harmonics under unbalanced power conditions. The effectiveness of the proposed algorithm is demonstrated by MATLAB/SIMULINK simulation and experimental results for a three wire distribution system with 15% unbalanced source voltages.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.3
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• pp.101-108
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• 2004

AC electric railroad system receives its power from 3-phase transmission system, Since, trainloads are changing continuously, the voltages for the single-phase load fluctuate in the train garage, and moreover, the fluctuating voltages generate high-order harmonics. This means that there is the difficulty in maintaining power quality in the power system. Therefore, a Static Var Compensator(SVC), which in general compensates the reactive power, is used in order to balance the trainload. In this paper, PSCAD/EMTDC is used for the analysis of harmonic generation in the train garage using SVC. The Total Harmonic Distortion(THD) of voltages is calculated using PSCAD/EMTDC dynamic simulation. As a result, the train garage using SVC improves power quality.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.4
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• pp.429-435
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• 2012

An abrasion due to continuous friction between a work roll and strip causes the mass of the work roll to be unbalanced in the rolling process. We developed a mathematical model for the rolling mill considering the unbalanced mass and verified the model experimentally. The work roll was approximated as a rigid rotor with eccentricity, and the effect of the unbalanced mass on chatter vibration was investigated. The joint forces computed by quasistatic analysis were applied to the work roll in the rolling mill. Transient responses were obtained, and frequency analysis was performed by solving equations of motion using a direct integration method. Horizontal vibrations were more strongly affected by eccentricity than vertical vibrations. In the horizontal direction, a small eccentricity of 1% of the work roll radius considerably increased the amplitude of the chatter frequency.

• Journal of Korea Society of Industrial Information Systems
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• v.21 no.3
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• pp.29-33
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• 2016

Development of the distributed energy resources such as photovoltaic, wind, and fuel cell has increased rapidly due to the rising demand for clean energy utilization. On the other hand, the distribution system became complex and has problems such as degradation of power factor and current unbalance caused by power converters, reactive power and unbalanced loads. To solve these problems, this paper proposes a 3-phase 4-leg type power conditioning system with compensation control algorithm for the reactive power and unbalance current in distribution system using photovoltaic resource. It is simulated in PSCAD/EMTDC and the effectiveness is confirmed.

• Journal of the Korean Society for Library and Information Science
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• v.40 no.4
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• pp.165-181
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• 2006

This study analyzed the gap between users' perception and staff expectations on users' perceptions about dimensions of library service quality(library staff, service supports. materials and resources, and facilities and equipments), service value, user satisfaction, royalty. using newly developed model. Six hundred-fourteen users and one hundred staff members or the National Libra of Korea were participated in the survey using questionnaires. Users evaluated service quality lower but evaluated service value, satisfaction. and loyalty higher In terms of showing complaining behaviors, users were less than staffs expected. Model analysis for users and staff3 showed that service value and general satisfaction influenced on complaining behavior and loyalty. For users. only the dimension of library staff influenced significantly on the service value, satisfaction, complaining behavior, and loyalty. None of the other dimensions of the service qualify showed significant relationship to them in the case of staff expectation.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.5
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• pp.386-393
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• 2001

A series active power filter compensating current harmonics and unbalanced source voltages in a 3phase-3wire power system is presented. The system is composed of series active power filter and shunt passive filters that are tuned at 5th and 7th harmonics. The proposed series active power filter improves harmonic compensation characteristics of the shunt passive filters, reduces source side harmonic currents and compensates the unbalanced source voltages. In the proposed algorithm, compensation voltage for harmonic reduction is calculated by a performance function, and compensation voltage for the unbalanced source voltage is calculated based on the synchronous reference frame. Some results obtained from the experimental model using the proposed method are Presented to demonstrate and confirm its validity.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.3
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• pp.275-284
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• 1999

Unbalanced source voltage in the 3-phase power system is decomposed into positive, negative and zero sequence c components. Also, assuming there is no neutral path in the system, the zero sequence component is not shown on the l load side. Therefore, in the unbalanced power system without neutral path. it is possible to provide balanced voltage to t the load side by compensating negative sequence component and also to regulate the voltage amplitude by controlling t the positive sequence component. In addition, the symmetrical components due to voltage unbalance can be effectively d detected on the synchronous reference frame by using dlongleftarrowq transformation. In this paper, an algorithm not only c compensating unbalanced source voltage by canceling the negative sequence component on the synchronous reference f frame but also maintaining load voltages constantly is proposed. Also a novel method for phase angle detection s synchronized by positive sequence component under unbalanced source voltage is suggested and this detected phase a angle is used for d-q transformation. The performances and characteristics of the proposed compensating system are a analyzed by simulation and verified through experimental results.

• The Journal of the Korea Contents Association
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• v.21 no.5
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• pp.182-199
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• 2021

This study was designed by paying attention to the negative aspects of the performing arts service. As interest in performing arts increases, various studies on services are being conducted in the performing arts field as well. However, although research on the positive side of performing arts services is steadily increasing, research on the negative side is insufficient. In this study, the limitations of existing studies were supplemented and the study was conducted by applying the Stimulus-Organism-Response (S-O-R) model for empirical research. The effect of failure of performing arts service as a stimulus variable on the response to complaint behavior through negative emotion as an organism was verified. As a result of the analysis, it was found that among the factors of failure in performing arts services, performance works and personal services had a significant influence on negative emotions. In addition, the influence of negative emotions on public and private complaints was confirmed. Lastly, this study will have academic significance in that it analyzed consumers by converting the factors of service failure of performing arts into variables.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.235-236
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• 2016

본 논문에서는 400Hz 항공기용 3상 4선식 인버터의 전압 제어에 대해 연구하였다. 시스템에서 불평형이 발생하면 중성선 전류가 증가하며 이에 따라 출력전압 불균형 및 왜곡 증가 등 시스템에 심각한 문제를 발생시킨다. 전압의 크기를 제어해주는 RMS 제어의 경우 불평형 발생 시 전압의 크기는 정상적으로 제어가 가능하지만, THD가 상승하여 전력의 품질이 저하될 수 있다. 다른 제어 방식인 비례 공진(PR) 제어는 순시적으로 제어를 함으로써 전압의 크기뿐만 아니라 위상차 및 THD 감소 등의 향상된 전력 품질을 기대할 수 있다. 두 제어방법의 비교는 시뮬레이션 및 실험을 통해 수행하였으며, 두 제어방법 불평형 발생 시 모두 전압의 크기 오차가 3% 이하로 정상적으로 제어하는 것을 확인하였고, THD는 RMS 제어에 비하여 PR 제어의 결과가 2% 감소하는 것을 확인하였다.