8 results on '"Feng, Chan"'
Search Results
2. Fermented Broth in Tyrosinase- and Melanogenesis Inhibition
- Author
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Chin-Feng Chan, Ching-Cheng Huang, Ming-Yuan Lee, and Yung-Sheng Lin
- Subjects
microorganisms ,fermented broth ,melanogenesis ,Organic chemistry ,QD241-441 - Abstract
Fermented broth has a long history of applications in the food, pharmaceutical and cosmetic industries. Recently, the use of fermented broth in skin care products is in ascendance. This review investigates the efficacy of fermented broth in inhibiting tyrosinase and melanogenesis. Possible active ingredients and hypopigmentation mechanisms of fermented broth are discussed, and potential applications of fermented broth in the cosmetic industry are also addressed.
- Published
- 2014
- Full Text
- View/download PDF
3. Interfacial Stress Analysis of Adhesively Bonded Lap Joint
- Author
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Shiuh-Chuan Her and Cheng-Feng Chan
- Subjects
double lap joint ,elasticity theory ,shear stress ,peel stress ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
The use of adhesively bonded joints in place of traditional joining techniques such as bolted or rivet joints is becoming greatly popular in recent years. Interfacial stress in the adhesive is critical to the strength of adhesively bonded joints. It is necessary to predict the interfacial stresses accurately to ensure the safety of joints. In this work, an analytical model is explicitly presented to evaluate the stresses in a double lap joint. The equilibrium equations in the adhesive overlap region are derived on the basis of elasticity theory. The governing equations are presented in terms of shear and peel stresses in the adhesive. Analytical solutions are derived for the shear and peel stresses, which are considered to be the main reason for the failure of the double lap joint. To verify the analytical solutions, the finite element method is conducted using the commercial package ANSYS. Results from the analytical solution agree well with finite element results and numerical investigations available in the literature. The effect of the adhesive thickness, shear modulus, adherend Young’s modulus and bonding length on the shear and peel stresses in the adhesive of the double lap joint are studied. Numerical results demonstrate that both the maximum shear and peel stress occur at both ends of the bonding region. The maximum values of the shear and peel stresses increase as the adhesive thickness decreases and as the adhesive shear modulus increases provided that the adhesive thickness is sufficiently small. The simplicity and capability to obtain analytical expressions of the shear and peel stresses for double lap adhesive bonded joints makes the proposed analytical model applicable for the stress analysis and preliminary structural design.
- Published
- 2019
- Full Text
- View/download PDF
4. Applications of Lactobacillus rhamnosus Spent Culture Supernatant in Cosmetic Antioxidation, Whitening and Moisture Retention Applications
- Author
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Cheng-Chih Tsai, Chin-Feng Chan, Wen-Ying Huang, Jin-Seng Lin, Patty Chan, Ho-Yen Liu, and Yung-Sheng Lin
- Subjects
Lactobacillus rhamnosus ,antioxidation ,whitening ,moisture retention ,tyrosinase ,Organic chemistry ,QD241-441 - Abstract
This study was aimed at investigating the antioxidant, whitening, and moisture-retention properties of Lactobacillus rhamnosus spent culture supernatant (Lr-SCS) in cosmetic applications. Results reveal that Lr-SCS effectively and gradually scavenges 1,1-diphenyl-2-picrylhydrazyl as well as 2,2-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) radical cations, and increases reducing power in a dose-dependent manner. Additionally, Lr-SCS can also suppress tyrosinase activity in vitro and effectively promote moisture retention. Heat treatment at 100 °C for 30 min does not influence the functions of Lr-SCS. We conclude that Lr-SCS can be used effectively in skin care cosmetics.
- Published
- 2013
- Full Text
- View/download PDF
5. Antioxidation and Melanogenesis Inhibition of Various Dendrobium tosaense Extracts
- Author
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Chin-Feng Chan, Chin-Tung Wu, Wen-Ying Huang, Wen-Shin Lin, Han-Wei Wu, Teng-Kuan Huang, Min-Yun Chang, and Yung-Sheng Lin
- Subjects
Dendrobium tosaense ,polyphenol ,antioxidation ,mushroom tyrosinase ,B16F10 ,melanogenesis ,Organic chemistry ,QD241-441 - Abstract
This study investigated the polyphenol content, antioxidant activity, and inhibition ability of mushroom tyrosinase and melanogenesis of Dendrobium tosaense (DT) extract. Ground DT was extracted using deionized water (W) or 50% ethanol (50E) at room temperature (RT) or 50 °C (50T) for 20 min. The 50T + 50E extract exhibited the highest total phenol content 47.0 ± 4.0 mg gallic acid equivalent/g DT extract, the highest level of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) free-radical scavenging 66.0 ± 3.0 mg Trolox equivalent/g DT extract, and the highest reducing power 12.00 ± 0.50 mg vitamin C equivalent/g DT extract. The RT + W extract had the highest total flavonoid content 110.0 ± 3.0 mg quercetin equivalent/g DT extract. The RT + 50E extract had the lowest half maximal inhibitory concentration 1.30 ± 0.00 mg/mL for 2,2-diphenyl-1-picrylhydrazyl free-radical scavenging, and the lowest half maximal inhibitory concentration 6.40 ± 0.30 mg/mL for mushroom tyrosinase inhibition activity. DT extracts, especially RT + W and 50T + W, exhibited potent inhibitory effects on melanogenesis of B16/F10 cells. These results demonstrated the application potential of DT extract for skincare.
- Published
- 2018
- Full Text
- View/download PDF
6. A Comprehensive Real-Time Traffic Map for Geographic Routing in VANETs
- Author
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Chi-Fu Huang, Yuan-Feng Chan, and Ren-Hung Hwang
- Subjects
VANETs ,geographic routing protocol ,real-time traffic information ,crowdsensing ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Vehicular Ad Hoc Networks (VANETs) have attracted a lot of attention during the last decade. VANETs can not only improve driving safety, but also convenience, and support most future Intelligent Transportation System (ITS). Due to the highly dynamic network topology of VANETs, many geographic routing protocols have been proposed and use real-time traffic information as an important metric to select a reliable forwarding path. However, most of the existing works do not describe how to gather real-time traffic. They either assume this information is already available, or can query an existing traffic center. Few studies have noticed this issue but the proposed solutions only consider a small region. In this paper, we propose a Comprehensive Real-Time Traffic Map (CRT Map) to collect wide-ranging real-time traffic information with low overhead. In the design of a CRT Map, the concept of Crowdsensing is adopted. Vehicles cooperatively gather traffic information and share it with each other to construct an overview of the whole road network traffic. In addition, we design a CRT Map Based Routing (CBR), which takes into account the connectivity of consecutive roads in routing decisions. Simulation results show that the CBR can achieve a lower end-to-end delay and a higher packet delivery ratio.
- Published
- 2017
- Full Text
- View/download PDF
7. A Comprehensive Real-Time Traffic Map for Geographic Routing in VANETs
- Author
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Ren-Hung Hwang, Chi-Fu Huang, and Yuan-Feng Chan
- Subjects
Computer science ,Wireless ad hoc network ,Geographic routing ,02 engineering and technology ,lcsh:Technology ,geographic routing protocol ,lcsh:Chemistry ,0203 mechanical engineering ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,VANETs ,Instrumentation ,Intelligent transportation system ,lcsh:QH301-705.5 ,Fluid Flow and Transfer Processes ,crowdsensing ,business.industry ,Network packet ,lcsh:T ,Process Chemistry and Technology ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,General Engineering ,020206 networking & telecommunications ,020302 automobile design & engineering ,Construct (python library) ,lcsh:QC1-999 ,Computer Science Applications ,lcsh:Biology (General) ,lcsh:QD1-999 ,lcsh:TA1-2040 ,Path (graph theory) ,Metric (mathematics) ,real-time traffic information ,Routing (electronic design automation) ,business ,lcsh:Engineering (General). Civil engineering (General) ,lcsh:Physics ,Computer network - Abstract
Vehicular Ad Hoc Networks (VANETs) have attracted a lot of attention during the last decade. VANETs can not only improve driving safety, but also convenience, and support most future Intelligent Transportation System (ITS). Due to the highly dynamic network topology of VANETs, many geographic routing protocols have been proposed and use real-time traffic information as an important metric to select a reliable forwarding path. However, most of the existing works do not describe how to gather real-time traffic. They either assume this information is already available, or can query an existing traffic center. Few studies have noticed this issue but the proposed solutions only consider a small region. In this paper, we propose a Comprehensive Real-Time Traffic Map (CRT Map) to collect wide-ranging real-time traffic information with low overhead. In the design of a CRT Map, the concept of Crowdsensing is adopted. Vehicles cooperatively gather traffic information and share it with each other to construct an overview of the whole road network traffic. In addition, we design a CRT Map Based Routing (CBR), which takes into account the connectivity of consecutive roads in routing decisions. Simulation results show that the CBR can achieve a lower end-to-end delay and a higher packet delivery ratio.
- Published
- 2017
8. Applications of Lactobacillus rhamnosus Spent Culture Supernatant in Cosmetic Antioxidation, Whitening and Moisture Retention Applications
- Author
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Ho-Yen Liu, Wen-Ying Huang, Cheng-Chih Tsai, Jin-Seng Lin, Patty Chan, Chin-Feng Chan, and Yung-Sheng Lin
- Subjects
Antioxidant ,Lactobacillus rhamnosus ,antioxidation ,whitening ,moisture retention ,tyrosinase ,Tyrosinase ,media_common.quotation_subject ,medicine.medical_treatment ,Pharmaceutical Science ,Cosmetics ,Article ,Antioxidants ,Analytical Chemistry ,lcsh:QD241-441 ,Bleaching Agents ,Picrates ,lcsh:Organic chemistry ,Drug Discovery ,medicine ,Tyrosinase activity ,Food science ,Physical and Theoretical Chemistry ,media_common ,Skin care ,biology ,integumentary system ,Chemistry ,Lacticaseibacillus rhamnosus ,Monophenol Monooxygenase ,Organic Chemistry ,Biphenyl Compounds ,food and beverages ,biology.organism_classification ,Enzyme Activation ,Biochemistry ,nervous system ,Chemistry (miscellaneous) ,Culture Media, Conditioned ,Molecular Medicine ,Moisture retention ,Oxidation-Reduction ,tissues - Abstract
This study was aimed at investigating the antioxidant, whitening, and moisture-retention properties of Lactobacillus rhamnosus spent culture supernatant (Lr-SCS) in cosmetic applications. Results reveal that Lr-SCS effectively and gradually scavenges 1,1-diphenyl-2-picrylhydrazyl as well as 2,2-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) radical cations, and increases reducing power in a dose-dependent manner. Additionally, Lr-SCS can also suppress tyrosinase activity in vitro and effectively promote moisture retention. Heat treatment at 100 °C for 30 min does not influence the functions of Lr-SCS. We conclude that Lr-SCS can be used effectively in skin care cosmetics.
- Published
- 2013
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