• 한국안전학회지
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• 제18권4호
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• pp.130-135
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• 2003

This study is planned to investigate the compliance of small sized enterprises of under 5 employees directed by Industrial Safety and Health Act. Occupational safety regulation can be required for employer and employee to comply because that all members of workplace should be involved to protect worker's health. When all members of workplace comply with safety regulation, effectiveness of regulation will be realized as expectation. The study subject is composed of three groups as 501 employers, 501 employees of small sized enterprises of under 5 employees and 107 safety inspectors sampled by stratified random sampling for comparison. Data for analysis is collected from each sample using interview with structured questionnaires. Compliance is measured by 5 point scale composed by 8 sub items such as general perception, understanding, clearness, necessity, relevancy, implementation, penalty, and general compliance of the regulation. Among sub items of employer's compliance, the level of perception of regulation, necessity of regulation, relevancy of penalty are differentiated among three groups. The level of all 8 items of employee's compliance also differentiated among three groups. These results show that strategies for ensuring the same level of compliance among three groups will be needed through education, training and evaluation of regulation and feedback.

• 한국융합학회논문지
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• 제12권6호
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• pp.119-125
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• 2021

초등학생 시기는 정서조절을 영역에서 발달 단계상 미성숙하기 때문에 정서조절능력 배양이 필요하다. 미술수업에 정서조절을 접목해 진행하면 학생들의 인성 변화에 긍정적인 영향을 기대할 수 있기에 본 연구는 정서조절 증진을 위해 우뇌의 기능을 활용한 정서조절 미술수업을 진행하고 정서조절 증진의 효과성을 사전·사후 질문지와 사후 인터뷰를 통해 분석하여 결과를 도출하였다. 사전 사후 분석 결과 수업 이후 정서조절 하위 요소 중 '자기 정서 인식 및 표현', '타인 정서 인식 및 배려' 그리고 '대인관계'에서 통계적으로 높게 나왔다. 인터뷰 분석 결과 모든 학생이 정서조절 하위항목에서 긍정적인 효과가 있었음을 알 수 있었다. 결과적으로 수업 전보다 수업 후에 자신의 정서를 인식하고 이해하였으며, 부정적인 정서를 긍정적인 정서로 정화함으로 정서를 표현할 수 있는 효과가 있었다. 앞으로 정서조절 미술수업을 위한 다양한 교수 학습 방법을 적용한 프로그램 개발이 필요함을 제언한다.

• 사회복지연구
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• 제45권2호
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• pp.203-232
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• 2014

본 연구는 급속히 확대되고 있는 사회서비스 분야에서 서비스 품질관리 제도는 어떤 요소로 구성되며, 이들 구성요소들을 기준으로 연구대상 국가들에서는 어떤 특징들이 포착되는지를 분석하였다. 이를 위하여 먼저, 선행연구를 토대로 국가 간 비교의 기준이 되는 핵심 구성요소들을 설정하고, 이 기준을 중심으로 서구에서는 영국과 미국을, 아시아에서는 싱가포르와 일본을 분석대상국가로 하여 비교하였다. 선행연구를 중심으로 품질과 품질관리의 개념과 동향을 검토한 결과 이용자 중심성, 제도 실효성, 운영 안정성을 품질관리제도의 핵심 구성요소로 설정할 수 있었다. 이용자 중심성은 품질관리 과정에서 이용자에게 품질정보가 공개되는 정도와 품질측정기준에서 이용자의 참여를 강조하는 정도를 나타내는 것으로 설정되었다. 제도 실효성은 품질평가 결과가 기관의 재정에 미치는 영향의 정도와 기관을 퇴출시킬 수 있는 있는가에 대한 영향력의 정도로 개념화 되었다. 운영 안정성은 품질관리 기구의 전담성과 품질지표가 전국적인 공통의 기준을 갖고 있는가의 정도로 설정되었다. 분석대상 국가들에서는 공통적으로 품질관리 제도에서 이용자 중심성을 강조하면서, 품질정보를 이용자에게 적극적으로 제공하고 있으며, 품질지표에서도 이용자 참여 부분을 강화하고 있는 것으로 나타났다. 제도 실효성의 측면에서는 매우 강력한 권한을 가지고 있는 나라도 있지만, 자율적으로 품질향상을 유도하는 방식으로 운영하는 경우도 있었다. 운영 안정성에서는 연구대상 국가들은 공통적으로 전국공통의 품질기준을 마련하고 있으며, 이에 대한 구체적인 가이드라인을 가지고 있는 것으로 나타났지만, 품질관리 전담기구를 독립적으로 운영하는 경우와 민간에 위탁하여 운영하는 경우 등으로 편차가 큰 것으로 나타났다. 이런 연구결과가 어떤 의미를 가지는지, 그리고 우리나라 품질관리제도에 어떤 시사점을 주는지를 설명하였다.

• International journal of advanced smart convergence
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• 제10권2호
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• pp.175-186
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• 2021

We have studied the speed regulation of the permanent magnet synchronous motor (PMSM) servo system in this paper. To optimize the PMSM servo system's speed-control performance with disturbances, a non-linear speed-control technique using a back-propagation neural network (BP-NN) algorithm forthe controller design of the PMSM speed loop is introduced. To solve the slow convergence speed and easy to fall into the local minimum problem of BP-NN, we develope an improved BP-NN control algorithm by limiting the range of neural network outputs of the proportional coefficient Kp, integral coefficient Ki of the controller, and add adaptive gain factor β, that is the internal gain correction ratio. Compared with the conventional PI control method, our improved BP-NN control algorithm makes the settling time faster without static error, overshoot or oscillation. Simulation comparisons have been made for our improved BP-NN control method and the conventional PI control method to verify the proposed method's effectiveness.

• 전기학회논문지
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• 제63권4호
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• pp.519-525
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• 2014

In this paper, an alternative variable structure controller is designed for the point-to-point regulation control of uncertain general linear plants so that the output of plants can be controlled from an arbitrarily given initial point to an arbitrarily given reference point in the state space. By using the error between the steady state value of the output and an arbitrarily given reference point and those integral, a transformed integral sliding surface is defined, in advance, as the surface from an initial state to an arbitrarily given reference point without the reaching phase problems. A corresponding control input is suggested to satisfy the existence condition of the sliding mode on the preselected transformed integral sliding surface against matched uncertainties and disturbances. Therefore, the output controlled by the proposed controller is completely robust and identical to that of the preselected transformed integral sliding surface. Through an example, the effectiveness of the suggested controller is verified.

• International Journal of Naval Architecture and Ocean Engineering
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• 제10권3호
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• pp.282-293
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• 2018

This paper attempts to address the motion parameter skip problem associated with three-dimensional trajectory tracking of an underactuated Autonomous Underwater Vehicle (AUV) using backstepping-based control, due to the unsmoothness of tracking trajectory. Through kinematics concepts, a three-dimensional dynamic velocity regulation controller is derived. This controller makes use of the surge and angular velocity errors with bio-inspired models and backstepping techniques. It overcomes the frequently occurring problem of parameter skip at inflection point existing in backstepping tracking control method and increases system robustness. Moreover, the proposed method can effectively avoid the singularity problem in backstepping control of virtual velocity error. The control system is proved to be uniformly ultimately bounded using Lyapunov stability theory. Simulation results illustrate the effectiveness and efficiency of the developed controller, which can realize accurate three-dimensional trajectory tracking for an underactuated AUV with constant external disturbances.

• Journal of Power Electronics
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• 제4권2호
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• pp.65-76
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• 2004

In this paper, the steady-state analysis of the three-phase self-excited induction generator (SEIG) driven by a variable-speed prime mover (VSPM) such as a wind turbine is presented. The steady-state torque-speed characteristics of the VSPM are considered with the three-phase SEIG equivalent circuit for evaluating the operating performances due to the inductive load variations. Furthermore, a PI closed-loop feedback voltage regulation scheme based on the static VAR compensator (SVC) for the three-phase SEIG driven by the VSPM is designed and considered for the wind power generation conditioner. The simulation and experimental results prove the practical effectiveness of the additional SVC with the PI controller-based feedback loop in terms of fast response and high performances.

• 제어로봇시스템학회논문지
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• 제22권7호
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• pp.491-495
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• 2016

We deal with the regulation problem of nonlinear systems with time-varying delays in both the states and input. A new state feedback controller with dynamic gains is developed based on matrix inequality and non-predictor methods. The proposed control scheme is analyzed using the Razumikhin theorem, and its effectiveness is demonstrated with simulation results.

• 아동학회지
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• 제28권4호
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• pp.229-244
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• 2007

A comprehensive program for children's leadership improvement by enhancing their self-esteem, empathy, communication competence and emotion regulation utilized core concepts and techniques or the Solution-Focused Model of Chung et al. (2005), Satir's Experiential Model(Chung, 2003), Cognitive-Behavioral Model (Kim, 2002) and problem-solving games (Chung & Kim, 2005). Twenty-six $3^{rd}$, $4^{th}$, and $5^{th}$ graders from public schools in Seoul participated in six 2.5 hour sessions and their mothers participated in two 2.5 hour sessions. All subjects received pre-, post- and follow-up tests. The results showed that children's self-esteem, empathy, communication competence, and emotion regulation increased as a result of this program and the effects lasted for at least three months after the termination of the program.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.21-23
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• 1999

The alternative precise method for voltage balancing and load compensation using the susceptances control of a STATCOM is discussed. With the control of STATCOM's output current, it is confirmed that the compensation susceptances can be variable. And then the STATCOM's control method about compensation susceptances for load compensation and voltage balancing/regulation is derived. Finally, the effectiveness of load compensation and voltage balancing/regulation is confirmed through computer simulation.