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Controlling chaos for automotive disc brake squeal suppression
Bao-Chau Lin,Shun-Chang Chang,Jui-Feng Hu,Yeou-Feng Lue 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
Disc brake squeal is a manifestation of friction-induced, self-excited instability in disc brake systems. This paper investigates the nonsmoothbifurcations and chaotic dynamics associated with braking systems. In most situations, decreasing squealing is a means to suppresschaotic disturbances, which would otherwise compromise the comfort of passengers. The proposed method begins with an estimationof the largest Lyapunov exponent using synchronization to differentiate between periodic and chaotic motions. We then observecomplex nonlinear behaviors associated with a range of parameters and plot them in a bifurcation diagram. Rich dynamics of disc brakesystems are examined using the bifurcation diagram, phase portraits, Poincaré maps, frequency spectra, and Lyapunov exponents. Finally,state feedback control is used to overcome chaotic behaviors and prevent squealing from occurring during braking. Finally, the effectivenessof the proposed control method is examined through numerical simulations.
History and present state of Vietnamese traditional medicine
Chau, Hoang-Bao 경희대학교 동서의학연구소 1989 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1989 No.3
Vietnam has a millienial traditional medicine. Under the reign of the HUNG kings(2879-257 BC) and of AN DUONG VUONG(257-179 BC) our ancestors found meals utilized as materia medica and medicinal plants. During the period of struggle for independence and liberty under the Chinese domination(179 BC-938 AB) the Chinese mandarins brought Chinese medicine with them in Vietnam. There was also exchange of midicines between Vietnam and China. Under the indenpendent reigns of Vietnam(938-1884) Vietnamese traditional medicine developed with the integration of Vietnamese and Chinese medicines. TUE TINH was a famous physician of the 14the century and HAITHUONG LAN ONG, that of the 18th century. During the period of struggle against French colonization Vietnamese traditional medicine has lost its official status and there was importaion of Westem medicine which has taken the official place in the health services of the country. Since 1945 until now, under the new regimes(Democratic Republic and Socialist Republic) thraditional medicine recovers its official place in the health system. From 1955, efforts were made to inherit and develop traditional medicine, to integrate it with Western modern medicine in order to enlarge the abilities of prevention and treatment and to edify a Vietnamese medicine. At present time we have established a system of traditional medicine in the national health network. We have also put into practice the three different methods of medicine and pharmacy : traditional, modern and integrated.
Ngoc Bao Chau Nguyen,Quynh Phuong Anh Nguyen,Thuy To Nhu Le,Thi Phung Kieu Nguyen,Bao Quoc Nguyen 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.2
We investigated the influence of convenient diets on big-eyed bug Geocoris ochropterus. Development and reproduction of G. ochropterus fed on convenient diets of ant pupae Oecophylla smaragdina and silkworm pupae Bombyx mori were examined using aphids Aphis gossypii as the control diet. Results showed that Geocoris ochropterus nymphs completed development to adults on all diets. Total average development period was 35.1 days fed on ant pupae, 35.9 days fed on silkworm pupae, and 36.0 days fed on aphids. Head width, body length, forewing length, and fresh body weight of adults were not affected by diets, except for females reared on ant pupae that were significantly heavier than those fed on aphids. There was no significant difference in offspring sex ratio. Total number of eggs deposited per female fed on ant pupae was significantly larger than when fed on aphids, while eggs laid by females fed on silkworm pupae were significantly longer than eggs laid by females fed on aphids. Results suggest that ant pupae and silkworm pupae could be effectively used for mass rearing of G. ochropterus.
베트남 로컬 커피전문점의 서비스스케이프와 서비스 품질이 만족도와 충성도에 미치는 영향에 관한 실증연구
( Nguyen Thi Bao Chau ),현인규 ( In-gyou Hyun ),노태우 ( Taewoo Roh ) 한국유통경영학회(구 한국유통정보학회) 2021 유통경영학회지 Vol.24 No.2
Purpose: Recently, as the qualified life of people improves according to the trend, various demands are created. The coffee shop was originally a shop that sold coffee. It has been developed in modern society in various forms and can satisfy the diversified demand of people. In the same way, as in the Vietnamese market, there are many new types of coffee stores in the era of globalization. However, Vietnamese local coffee shops could hold the top positions in the competition even though global franchise coffee shops had actively entered. Thus, this study investigated how the servicescape and the Vietnamese local coffee shop's service quality impact customer satisfaction and loyalty. Research design, data, and methodology: This study verifies the hypothesis using the PLS-SEM (partial least square structural equation method) to confirm the effects of influence relationship between Vietnam's local coffee shop's servicescape and service quality onand customer attitude, satisfaction, and customer loyalty. We conducted a survey distributing to people who have visited Vietnam and collected valid 531 responses. Results: Among the servicescape factors of local coffee shops in Vietnam, comfort littledoes not affects the attitude of customers;, and accessibility hads a significant impact on customer attitudes. We found that bothThe factor of service quality responsiveness and empathy of local coffee shops in Vietnam all influence customers' attitudes and that. The attitude of the Vietnamese local coffee shop to the servicescape affects the satisfaction and attitude towardfor the service quality and significant. Implications: The implications of this study are as follows. ForIn order to provide better services to obtain consumer empathy, the role of employees is enormous. As shown in the analysis results, localization strategies are needed when entering the Vietnamese coffee market because responsiveness and empathy in service quality play an important role. It wouldwill be effective to create a system to educate employees appropriately in the local area and recruit talented personnel in hiring coffee shops.
THE EFFECT OF SCRIPT CHANGE ON CONSUMERS’ ACCEPTANCE OF AUTOMATED FRONTLINE SERVICE ENCOUNTERS
Nguyen Phuong Bao Chau 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
Automation of frontline service encounters, or the replacement of frontline employees by technologies, is increasingly more common. This new service style, often called self- service, has attracted the attention of service providers who are looking to cut costs (Lin & Hsieh, 2007; Walker et al., 2002) and increase efficiency (Bitner et al., 2002; Curran et al., 2003; Dabholkar, 1996). On the other hand, a major disadvantage of self-service is that it puts the burden of service delivery on consumers (Lu et al., 2019). In other words, the introduction of self-service means a shift from consumers being served by frontline employees to their serving themselves by interacting with technologies. This means that consumers’ acceptance is key for self-service to be implemented successfully.
Bao, Le Quoc,Phuong, Ho,Thuy, Chau Thi Thanh,Lee, Ji Won,Kim, Jae Hong,Thogiti, Suresh Informa UK (TaylorFrancis) 2017 Molecular Crystals and Liquid Crystals Vol.653 No.1
<P>Two double branched organic dyes (T1I and T2I) were synthesized, characterized, and employed as photosensitizers in p-type dye-sensitized solar cells (p-DSSC); we have compared with corresponding single branched dye (TC1) and reference dye P1. The absorbance of the dyes in solution was red shifted and the oxidation potential gradually decreased with increasing the donating ability. It was found that modification from single branched (TC1) to double branched (T1I and T2I) system resulted in increased photocurrent density leading to the higher photovoltaic performances. The charge transporting ability is increased with the introduction of double branching, as evidenced from electrochemical impedance analysis.</P>
Factors Affecting Training Quality and Student Satisfaction: An Empirical Study in Vietnam
Duong Thi Hai LE,Long Duc Bao NGUYEN,Chau Le Ngoc PHAN,Tuan Minh VU,Hien Thu PHAN 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.4
The purpose of this study was to determine the factors that influence the training quality of Van Lang University’s Finance Banking faculty (VLU). Another goal was to discover a way to increase training quality and give students the greatest experience possible. To achieve the following goals, qualitative research was used in combination with questionnaires and document reviews. A total of 700 surveys were sent out, with 624 responses. In-depth interviews with 12 graduates were conducted during the qualitative stage to obtain their perspectives on their time at VLU. The impact of five factors (instructor qualification, facility, education program, accessibility, and student interaction) was investigated in this study, and the findings revealed that all of them significantly mediated the relationship with the training quality of VLU’s Finance Banking faculty. The findings show that it is vital to improve the training quality to increase student satisfaction and boost their academic abilities. With the framework from this study, policymakers, researchers, and institutes can cooperate in developing and upgrading the general training quality at higher education institutions in Vietnam. Improving the training quality of a faculty will continue to be a challenge. Therefore, this is a topic that requires continuous research.