Earticle

As the 4G and 5G Internet technologies become more common and developed, an environment for uploading and watching videos is created and spread, in addition to simply uploading posts. Watching and sharing daily life among media contents called Vlog, are very common more than ever. This means that individual users could access Vlog easily and the situation could be new trend. Additionally, academic research about Volg is increasing. We analyzed three independent variables affecting a perceived enjoyment we set up the dependent variable. Information search, self-expression, and social need are set as independent variables and social interaction is set as the control variable. Information search and self-expression are significant effect to perceived enjoyment except social need. In particular, social interaction as a control variable has effect to all relationships.

본 연구는 청소년들의 인터넷 게임동기에 있어서 사교성과 공격성이 그들의 대인관계에 어떠한 영향을 미치는가를 알아보고자 하는 것이다. 연구결과, 인터넷게임 동기(사교성, 공격성)에 따라 가상적 대인관계는 차이가 있는 것으로 나타났다. 따라서 청소년들의 인터넷게임 동기는 그들의 가상적 대인관계에 영향을 끼치기 때문에, 공격성보다는 사교성의 동기로 인터넷게임을 하도록 장려하고, 올바른 가상적 대인관계를 형성할 수 있도록 유도하는 것이 필요하다.

The purpose of this study attempts to see the influence of sociality and aggressiveness in the Internet game motives on the interpersonal relations of youths. The results of this study shows that there is a difference in on-line interpersonal relations based on the Internet game motives(sociality, aggressiveness). Therefore, we need to encourage the youths to play an Internet game with a social motive and lead them to make a right interpersonal relation because the Internet game motives of youths can affect their on-line interpersonal relations.

The author introduces a test platform system that has been developed for variable-speed controlmoment gyroscopes(VCMGs). VCMGs are important actuators for spacecraft attitude control. The testplatform consists of two VCMGs driven by servo motors and sensor modules. The control program hasbeen coded by the NI LabVIEW. Accelerometers and gyros have been used to measure the attitude angleand angular speed of the platform. The 2nd order low pass filters have effectively filtered out noisesfrom measurements. Wheel speeds and gimbal angles have been controlled satisfactory by PI control. Through some tests, moment generation has been verified. The moment has been generated ascommanded. However, friction effect by a ball bearing, that supports the platform’s rotation, has beennot negligible. As further studies, friction reduction will be studied. In conclusion, this test platform willbe used for engineering education and research.

현재 현대인들의 소득수준 향상과 여가시간 증대, 가치관의 변화 등으로 인해 문화산업의 중요성이 부각됨과 동시에 예술, 전시, 공연에 대한 수요가 점차 커지고 있다. 그러나 국내 기술력이 저조하여 무대연출 장비를 수입품에 의존하고 있는 경우가 많다. 특히 조명연출 분야에서는 배우의 동선을 파악하고, 조명을 제어해야 할 필요가 있는데 IT기술을 이용할 수 있음에도 불구하고 육안으로 배우를 인식하여 수기적으로 제어하는 경우가 일반적이다. 센서 응용하더라도 배우인지를 위해 단순한 형태의 단일 센서만 응용하 기 때문에 무대 전체조명의 온-오프에 따라 배우감지 및 추적이 불가능한 경우도 생긴다. 따라서 본 논문에서는 무대배우를 보다 효과적으로 추적할 수 있는 멀티센서 기반 알고리즘과 무대 조명연출을 유연하게 할 수 있는 LED(light emitting diode)조명 FOV(field of view) 및 가변형 제어 시스템을 제안하였다. 또한 제안한 시스템과 알고리즘을 바탕으로 핵심적인 하드웨어 및 소프트 웨어를 구현하고 전체 시스템 연동실험을 통해 실용성과 구현가능성을 입증하였다. 추가적으로 구현된 센서모듈의 출력을 실측하고 제안한 FOV가변형 LED조명 시스템의 성능을 시뮬레이션함으로써 제안한 시스템의 유용성을 입증하였다.

Recently, an importance of culture industry has been emphasized through an increased income level, spare time and changed values of modern people. And demands of the performance, arts, exhibit are steadily being increased. However the stage equipment depends on foreign manufactures on account of the inactive domestic technical skills. Especially in the lighting direction part, it is essential to control the lighting source and detect the moving line of actors but it generally uses the manual control type and realization of actor's moving line regardless of existing IT-based technologies. Also the system operation of existing sensor-based tracking and detecting technologies depends on the main lighting source of the stage. Therefore, this paper proposed LED lighting control system using the variable FOV and multi sensor-based tracking algorithm, which are possible to efficiently track the stage actors and direct the stage lights. Also we demonstrated the practicality and possibility of realization through the integrated experiment of the proposed system and implementation of the salient hardware, software. Additionally, the usefulness of proposed system was demonstrated using performance simulations and actual measurements of implemented sensor output.

Even though the ad hoc Shewhart methods remain controversial due to various mathematical flaws, there is little disagreement among researchers and practitioners when a set of process data has a skewness distribution. In the context and language of process control, the error related to the process data shows that time to signal increases when a control parameter shifts to a skewness direction. In real-world industrial settings, however, quality practitioners often need to consider a skewness distribution. To address this situation, we developed an enhanced design method to utilize advantages of the traditional attribute control chart and to overcome its associated shortcomings. The proposed design method minimizes bias, i.e., an average time to signal for the shift of process from the target value (ATS) curve, as well as it applies a variable sampling interval (VSI) method to an attribute control chart for detecting a process shift efficiently. The results of the factorial experiment obtained by various parameter circumstances show that the VSI c control chart using nearly unbiased ATS design provides the smallest decreasing rate in ATS among other charts for all experimental cases.

Today, conventional CVT equipped vehicle controls engine torque and gear ratio by using engine torque map and shifting map. But this control process is difficult to optimize the fuel economy when the driving mode is changed arbitrary. In this study, I propose the real-time CVT control with considering the power loss of transmission system to improve vehicle fuel economy and drivability. The driving performance and fuel economy of the proposed control logic is analyzed by backward simulation and the validity of new control logic is verified.

고정밀 교류전원 제어시스템은 교통관제등과 같은 가변 부하를 운영하는데 중요하다. 이러한 시스템은 가변부하에 대응하기 위하여 제어의 정밀성이 요구되며, 이를 위하여 AC/DC/AC 변환이 가능한 인버터를 주로 사용하게 된다. 따라서 본 논문에서는 고정밀 전류제어를 수행하기 위하여 개선된 전류계측 기법을 이용한 제어시스템을 제안하였다. 제안된 계측기법은 전류의 궤환된 계측을 순시적 실효치의 이동평균법을 사용하여 응답 및 정밀성을 개선한 방식이다. 컴퓨터 시뮬레이션 및 실험의 결과는 제안된 시스템의 타당성을 입증할 수 있었으며, 이는 항공관제 유도시스템의 조명제어 장치에도 폭넓게 적용되리라 사료된다.

The control system of high-precision AC power is important in traffic management lighting and beaconing of aerodromes, etc. To control AC power supply in these load characteristics, inverter systems of AC/DC/AC conversion are widely used in high-precision current control. Therefore, in this paper, a inverter system of constant current regulation using improved measuring technique of feedback current is proposed. Proposed measuring techniques improve response and precision in that it use moving average method of instantaneous RMS for measuring current sensing. Results of the computer simulation and experiment prove the effects of proposed system.

This paper is to present design principle and operation strategy of acceptance control chart by the use of OC-Based sampling inspection for continuous data. The unified control limits for acceptance control chart when considering both APL(Acceptable Process Level) and RPL(Rejectable Process Level) are proposed. The control limits can be also extended to the acceptance control chart with unknown process standard deviation.

The global power generation industry is becoming a key power generation industry with gas power generation and renewable energy solar power generation. This research aims to focus on solving two problems as a method to improve the solar light collection efficiency among fixed variable deformation methods. Maintaining the proper temperature of the water injection device through automatic temperature detection to solve efficiency degradation, and establishing an automatic operation system by finding the optimal angle for each season, are intended to derive a value that can represent the optimal power generation.

The purpose of this study was placed to analyze the causal relationship between deviant behavior, adaptive behavior, self-regulation ability and the involved variables of e-sports game in korean youths. The subjects were 890 middle school students of 13-15 years old male. The results are as follows. First, There was a positive relationship between the involved variables of e-sports game and self-regulating ability. Second, There was a negative relationship between the involved variables of e-sports game and deviant behavior. Third, There was a positive relationship between the involved variables of e-sports game and adaptive behavior. Fourth, there is the negative relationship between self-regulating ability and deviant behavior. Fifth, There was a positive relationship between self-regulation ability and adaptive behavior. In conclusion, raising the attitude of parents suggest that an important variable in the self-regulation and social behavior of young people to enjoy the e-sports games.

This paper proposed a novel fuzzy Variable Structure Controller (VSC) design for uncertain T-S fuzzy system, while neither assuming the control matrices of each local T-S model to be same nor knowing the priori information of the upper norm-bounds of uncertainties. The existence condition of desired sliding surfaces and the asymptotical stability of the reduced-order equivalent sliding-mode dynamics are firstly derived by solving a set of linear matrix inequalities (LMIs). After the establishment of the local T-S model, the upper norm-bounds of uncertainties and modeling errors between the original and local systems are estimated. Then, the designed VSC controller composes of a state-feedback control term and an adaptive switching-feedback control term, which are achieved based on the Lyapunov function method. Finally, a numerical example is illustrated in order to show the effectiveness of the proposed methods.

This paper examines single input single output (SISO) chattering free variable structure control (VSC) which controller coefficient is on-line tuned by fuzzy backstepping algorithm. VSC methodology is selected as a framework to construct the control law and address the stability and robustness of the close loop system based on Lyapunove formulation. The main goal is to guarantee acceptable trajectories tracking between the robot arm actual output and the desired input. The proposed approach effectively combines the design technique from variable structure controller is based on Lyapunov and fuzzy estimator to estimate the nonlinearity of undefined system dynamic in backstepping controller. The input represents the function between variable structure function, error and the rate of error. The outputs represent fuel ratio, respectively. The fuzzy backstepping methodology is on-line tune the variable structure function based on adaptive methodology. The performance of the SISO VSC which controller coefficient is on-line tuned by fuzzy backstepping algorithm (FBSAVSC) is validated through comparison with VSC and proposed method. Simulation results signify good performance of trajectory in presence of uncertainty and external disturbance.