Fuzzy Controller를 이용한 지능형 정속주행 시뮬레이션

김현덕,추연규 진주산업대학교 1999 論文集 Vol.38 No.-

This paper proposes a design of fuzzy controller for cruise control of vehicle in the straight road. Actually, a vehicle's velocity is described by kinematic of a special invitation and non-linearity. The proposed method of efficient control is based on the primary fuzzy controller for linear acceleration (main controller) and on the secondary fuzzy controller for convenient riding. The simulation was carried out using Matlab by this method.

2자유도 PID 제어기의 파라미터 α 추종을 이용한 2관성 시스템의 진동억제

추연규,김현덕 진주산업대학교 2004 論文集 Vol.43 No.-

A torque transmission system composed of several gears and couplings is flexible. In order to get an exact response of motor, the torsional vibration due to an unexpected change of motor speed must be suppressed. Therefore, it is very important that motor control suppress vibration. Various methods to control it including dual inertia system are proposed. Specially, the method of vibration suppression is that vibration can be suppressed to feedback the estimated torsion torque via the disturbance observer filter being of normal filter. The suitable Proportional controller and coefficient parameter can be designed using CDM and the torsional vibration also be suppressed, but it has a low degree of adaptability to disturbance. The PID controller can be designed easily, but makes the excessive overshoot and oscillation for system response in the early period. To resolve these problems, simple and practical PID controller with two degree of freedom is proposed recently that it can improve performance of obeying the reference unconcerned in any disturbance by changing the proportional gain by two degree of freedom parameter. But it has also the defect that parameter α must be changed to obtain the ideal Proportional parameter. On this paper, we design the controller which automatically adjusts parameter α using Fuzzy Algorithm to overcome such defects.Also, we compare the proposed method with established one and evaluate them to confirm performance of the designed controller.

카오스 퍼지 보상 알고리즘을 이용한 전력수요 단기예측에 관한 연구

김현덕,추연규 진주산업대학교 2004 論文集 Vol.43 No.-

The estimation of electrical power consumption is becoming more important to supply stabilized electrical power recently. In this paper, we propose a supplied forecasting system of electrical power using Fuzzy Compensative Algorithm to estimate electrical load accurately than the previous. We evaluate a time series of supplied electrical power have the chaotic character using quantitative and qualitative analysis, compose a forecasting system by the maximum change rate(α) of Fuzzy Algorithm and compensative parameter. Simulating it for obtained time series, we can take more accurate results than the previous proposed system.

PET의 절연파괴와 공간전하효과

金永煜,신추연,김인수,윤성도 군산대학교 1993 群山水産專門大學 硏究報告 Vol.28 No.1

This paper examined the existance behavior of charged particles by measuring polarity inversion current Thermally Stimulate Current (TSC) and analyed appearance mechanism of polarity inversion current peak and also investigated relation between ionic space charge formation and dielectric breakdown by measuring D.C breakdown impulse breakdown D.C-impulse superposition as a sample of PET. As a result, we found that dielectric breakdown is likely to happen due to ionic space charge at the transient state when applied polarity inversion voltage and that charged partion of TSC peak at the high temperature was the same as that of polarity inversion current. Also there was no effect on ionic space charge about the dielectric breakdown in stationary state when applied D.C voltage.

비행 자세제어를 위한 퍼지제어기 설계

추연규,김현덕,박종오 진주산업대학교 산업과학기술연구소 2003 산업과학기술연구소보 Vol.- No.10

The forces and moments at the aircraft c.g. have components due to aerodynamic sffects and to engine thrust. For the flight stability and autopilot systems we present a attitude control method using an intelligent control algorithm Which is based on the control rules from experts knowledge concerning the motion equations and other experiences. Then a robust fuzzy cintroller is developed to control the flight attitude. The controller can deal with multiple inputs and outputs. We have made an aircraft model and the orientation sensor for experimental fights. The control rules based on the flight expert's experience and knowledge can be programmed by fuzzy rules, and determined control rules by experimental flight. We can be stable attiude control by fuzzy controller.

PID 제어기의 퍼지 이득 조정

탁한호,추연규,김현덕 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

The purpose of this paper is to find PID parameters. The model of controller is designed by Matlab-Simulink program and each parameter of PID is estimated automatically by the Fuzzy controller. The simulation is carried out on FGS(Fuzzy Gain Scheduling), and then this is compared and analyzed with the simple PID controller.

전신경화증에서 관상동맥 경화증에 대한 예비 연구

박영은,백승훈,정연주,추기석,김성일 부산대학교 병원 암연구소 2009 부산대병원학술지 Vol.- No.25

NaOH 첨가에 따른 음식물찌꺼기 고온 혐기성 산발효

안철우,이철승,서종환,박진식,문추연,장성호,김수생 한국환경농학회 2004 한국환경농학회지 Vol.23 No.4

본 연구는 음식물찌꺼기의 혐기성 산발효에 있어 여러 조건들 중 온도가 효율적인 가수분해와 산발효에 미치는 영향을 검토하기 위해 고온(55℃)과 중온(35℃)에서 각각 실험을 수행하여 다음과 같은 결론을 얻을 수 있었다. 음식물찌꺼기의 혐기성 산발효시 산생성 효율을 높이기 위한 전처리 과정으로 음식물찌꺼기에 NaOH를 투입한 결과 가수분해효율을 표현한 가용화 정도(Solubilization)가 0.01 g NaOH/g TS이하로 투입된 경우 0.01 mgSCOD_(prod)/mgICOD_(inf)이하를 나타내었으나, 0.05 g NaOH/g TS이상을 투입했을 때는 0.07~0.09 mgSCOD_(prod)/mgICOD_(inf)로 나타났다. 따라서 음식물찌꺼기에 NaOH를 투입하여 효율적인 가수분해가 이루어지기 위해서는 g TS당 0.05 g이상의 NaOH가 투입되어야 할 것으로 판단된다. 음식물찌꺼기를 NaOH로 전처리한 후 고온(55℃) 산발효를 실시했을 때 0.05 g NaOH/g TS 투입시 SCOD의 증가치 3,800 mg/L로 최대의 가용화와 산생성에 효과적인 pH 5.95를 얻을 수 있었다. 0.05 g NaOH/g TS를 투입하여 중온(35℃)에서 산발효를 실시한 경우와 비교하여 SCOD 증가치가 약 5배 정도 높았고, 최대 가용화에 이르는 시간도 중온의 2/3 정도로 짧아 음식물찌꺼기의 가용화에는 고온이 효과적인 것으로 나타났다. NaOH 0.05 g NaOH/g TS로 전처리된 음식물찌꺼기의 산발효 결과 고온(55℃) 및 중온(35℃)에서 각각 반응시작 후 72시간에 12,600 mg/L, 120tlrksdp 9,800 mg/L의 VFA농도를 나타내어 동일기질을 이용하여 산발효를 실시했을 때 중온보다는 고온에서 미생물의 활성증대와 유기물의 가수분해가 촉진되어 VFA생성이 효율적인 것으로 판단되었다. 고온에서 NaOH에 전처리된 음식물찌꺼기를 산발효 시켰을 때 VFA가 가장 높았던 시점을 기준으로 VFA의 조성을 조사한 결과 acetic acid가 45.9%, butyric acid가 26.7%, propionic acid가 13.9% 등으로 총 유기산 발생량의 86.5%를 차지하였다. This study showed that thermophilic anaerobic acid fermentation of food wastes had an enhanced hydrolysis capability and improvement of acidification efficiency. Influence of pH on the anaerobic hydrolysis and acidogenesis was investigated to determine the proper alkalinity in the thermophilic fermentation of food wastes. The results of putting NaOH as alkali to evaluate hydrolysis and acid fermentation efficiency in acid fermentation process of food wastes showed that the food wastes pretreated with 0.05 g NaOH/g TS had the maximum 12,600 mg/L of VFAs concentration during HRT 3 days in 55℃ hermophilic condition and the maximum 9,700 mg/L of VFAs concentration during HRT 5 days in 35℃ mesophilic condition. The accomplishment of high VFAs concentration resulted from that the main component of food wastes such as cellulose, lignin and etc. is performed active chemical decomposition by alkali in thermophilic condition. The major components of VFAs produced from the thermophilic acid fermentation process of food wastes were the short chain fatty acids such as acetic acid, butyric acid, and propionic acid.

Effect of Importance of Selection Attributes on Satisfaction and Repurchase of Nostalgic Desserts among 20’s

Choo Yeon KIM(Choo Yeon KIM),Seunghyeon LEE(Seunghyeon LEE),Seong Soo CHA(Seong Soo CHA) 한국유통과학회 2024 The Journal of Industrial Distribution & Business( Vol.15 No.3

Purpose: This research aimed at understanding the dynamics of consumer behavior in the context of nostalgic desserts. The primary objective is to scrutinize how different attributes like quality, health, convenience, and trend influence customer satisfaction and their subsequent decision to repurchase nostalgic desserts. Research Method: The study leverages structural equation modeling, incorporating statistical tools such as SPSS and AMOS for a thorough analysis. It involves collecting data over a specified period, followed by correlation and trend analyses to deduce patterns and relationships. Results: The findings reveal that attributes such as quality, health, convenience, and trend significantly impact customer satisfaction and repurchase intentions. Interestingly, economic factors appeared to have a negligible effect on these decisions. The study offers a comprehensive understanding of the factors that influence consumer decisions in the context of nostalgic desserts, providing valuable implications for both academic research and practical marketing strategies. Conclusions: The insights garnered from this research are pivotal for formulating marketing strategies for nostalgic dessert brands. It underscores the importance of accentuating quality, health, and trend in product offerings to boost customer satisfaction and encourage repurchases. The study also sheds light on the evolving nature of consumer preferences and the integral role of nostalgia in shaping purchasing behaviors.

Effects of ESG Management of Retail Companies on Consumer Values and Attitudes

Choo Yeon KIM(Choo Yeon KIM),Ji Min PYO(Ji Min PYO),Seong Soo CHA(Seong Soo CHA) 한국유통과학회 2023 유통과학연구 Vol.21 No.4

Purpose: This study aims to investigate the effect of retailer’s ESG performance on consumption value. The research analyzed the effect of consumption value that can be obtained through ESG management of retail companies on consumer attitude and repurchase intention. Research design, data, and methodology: A research model and hypothesis were established, and statistical analysis was performed on a total of 278 samples of all age groups. To secure the reliability and validity of the data, confirmatory factor analysis and discriminant validity analysis were performed, and the causal relationship of latent variables was verified through path analysis. Results: As a result of the analysis, it was found that among the characteristics of consumption value according to ESG management, social value, economic value, accessible value, and eco-friendly value had an effect on social contribution attitude. Also, the economic value was found to have an effect on the self-actualization attitude, and both the social contribution attitude and the self-actualization attitude have an effect on the purchase intention. Conclusions: This study empirically analyzed the value of ESG management in the retail industry that consumers are paying attention to recently. This will serve as a basis for revising and supplementing the retail companies’ strategy in the near future.