An Irreversible Ripeness Indicator to Monitor the CO2 Concentration in the Headspace of Packaged Kimchi during Storage

Xiangpeng Meng,이규호,강태영,고상훈 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.1

An irreversible chitosan-based indicator has been developed to monitor the kimchi quality corresponding to the partial pressure of CO2 gas in the packaging headspace. For this, 0.3% (w/v) solutions of chitosan and the Coomassie Brilliant Blue dye (BB) were mixed at volume ratios of 10:1, 10:2, and 10:5 to yield BB-incorporated chitosanbased CO2 indicators. A greater CO2 accumulation was observed for kimchi samples stored at 25oC than those stored at 15oC. Acidity measurements indicated optimal consumer satisfaction at 1 and 3 days (when the transparency measurements for the developed indicators were approximately 20%) for kimchi samples stored at 15 and 25oC, respectively. A Pearson correlation analysis revealed that the indicator transparency correlated well with several parameters used to indicate the kimchi quality.

Carbon Dioxide and Oxygen Gas Sensors-Possible Application for Monitoring Quality, Freshness, and Safety of Agricultural and Food Products with Emphasis on Importance of Analytical Signals and Their Transformation

Xiangpeng Meng,김세훈,pradeep puligundla,고상훈 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.6

Intelligent packaging technologies are rapidly gaininginterest in the agriculture and food industries. Intelligent packagingfor agricultural and food products has great potential to improvethe shelf life and safety of agricultural and food products apartfrom its basic functions of keeping the products clean andprotecting against unwanted physical and chemical changes. Intelligent packaging components are not limited to radiofrequency identification (RFID) sensors, time-temperature indicators,ripeness indicators, and biosensors. Carbon dioxide, oxygen gassensors and nanobiosensor can be used for real-time monitoring offreshness or quality for agricultural and food products. In thisreview, details of different sensors that are primarily used forcarbon dioxide or oxygen gas sensing and their possible potentialto be incorporated into agricultural and food packaging forproduct quality monitoring are discussed. In addition, specialemphasis is placed on detailing the importance of analyticalsignals and their transformation, because these aspects play crucialrole in monitoring the quality and freshness of agricultural andfood products via intelligent packaging systems. Signal transducerscontribute to the establishment of communication between theproduct quality sensor and the communication components suchas RFID sensors in smart packaging systems by converting asignal in one form of energy to another form.

Model-Based Drive Shaft Torque Estimation and Control of A Hybrid Electric Vehicle in Energy Regeneration Mode

Xiangpeng Yu,Tielong Shen,Gangyan Li,Kunihiko Hikiri 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

In auto motive applications, effective and affordable acquirement of drive shaft torque value could greatly ben-efit the vehicle drive line feedback control. This paper presents a model-based to rque observer to estimate the drive shaft to rqueusing transmission output shaft angular speed and driven wheel angular speed. A detailed drive line model used for characterizing the behavior of the HEV drive line and a simplified model used for observer design will be constructd. The estimated to rque will be used for carrying out brake system feedback control in a HEV. Several simulations will be presented to demonstrate the effectiveness of the proposed observer.

Design and analysis of one-degree statically indeterminate hydraulic support

Xiangpeng Hu,Xinhua Liu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.12

To enhance the bearing capacity of traditional two- and four-legged shield hydraulic support, a one-degree statically indeterminate support was designed, and a method to control the linkage of the legs and balance ram was established. Based on the plane frame system, a two-dimensional mechanical model of the statically indeterminate support was established, and the analytical expressions for the transverse distribution interval of the boundary load were derived. The effects of the friction coefficient and balance ram specifications on the boundary load and bearing area were quantitatively analyzed. The results indicated that the bearing area is divided into two regions along the transverse direction. Furthermore, this bearing area can be increased by increasing the friction coefficient, increasing the balance ram specifications, and decreasing the tip-to-face distance under the downward motion of the support. The bearing capacity of the proposed support is considerably higher than that of the traditional support.

Application of Iron Oxide as a pHdependent Indicator for Improving the Nutritional Quality

( Xiangpeng Meng ),( Jina Ryu ),( Bumsik Kim ),( Sanghoon Ko ) 한국임상영양학회 2016 Clinical Nutrition Research Vol.5 No.3

Acid food indicators can be used as pH indicators for evaluating the quality and freshness of fermented products during the full course of distribution. Iron oxide particles are hardly suspended in water, but partially or completely agglomerated. The agglomeration degree of the iron oxide particles depends on the pH. The pH-dependent particle agglomeration or dispersion can be useful for monitoring the acidity of food. The zeta potential of iron oxide showed a decreasing trend as the pH increased from 2 to 8, while the point of zero charge (PZC) was observed around at pH 6.0-7.0. These results suggested that the size of the iron oxide particles was affected by the change in pH levels. As a result, the particle sizes of iron oxide were smaller at lower pH than at neutral pH. In addition, agglomeration of the iron oxide particles increased as the pH increased from 2 to 7. In the time-dependent aggregation test, the average particle size was 730.4 nm and 1,340.3 nm at pH 2 and 7, respectively. These properties of iron oxide particles can be used to develop an ideal acid indicator for food pH and to monitor food quality, besides a colorant or nutrient for nutrition enhancement and sensory promotion in food industry.

Relaxed Fuzzy Observer Design of Discrete-Time Nonlinear Systems via Two Effective Technical Measures

Xie, Xiangpeng,Yue, Dong,Park, Ju H.,Li, Hongyi IEEE 2018 IEEE transactions on fuzzy systems Vol.26 No.5

<P>This paper deals with more relaxed designs of discrete-time Takagi–Sugeno fuzzy-model-based observers via two effective technical measures. Different from previous methods of this field, two effective technical measures are developed for obtaining more relaxed results, i.e., 1) A novel ranking-based switching mechanism is proposed by introducing a set of weighted variables so as to make use of the size differences information among normalized fuzzy weighting functions more freely. 2) A new slack variable method is proposed via the introduction of some extended representations for homogenous polynomials, and those major and minor relationships among all normalized fuzzy weighting functions are mapped to sole augmented multiindexed matrix for each homogeneous polynomial. Therefore, two positive results are provided in this paper, i.e., less conservative fuzzy observers can be given as a result of the above effective measures whilst a part of the online computational cost can be transferred to the offline implementation. Finally, two numerical examples are applied to illustrate the effectiveness of our approach.</P>

Enhanced Li storage performance of ordered mesoporous MoO2 via tungsten doping.

Fang, Xiangpeng,Guo, Bingkun,Shi, Yifeng,Li, Bin,Hua, Chunxiu,Yao, Chaohua,Zhang, Yichi,Hu, Yong-Sheng,Wang, Zhaoxiang,Stucky, Galen D,Chen, Liquan RSC Pub 2012 Nanoscale Vol.4 No.5

<P>Ordered mesoporous tungsten-doped MoO(2) was synthesized by a nanocasting method. The Li storage performance of mesoporous MoO(2) is significantly improved by tungsten doping, which exhibits a reversible capacity of 700 mA h g(-1), better cycling and rate performance. This material combines the advantages of the high theoretical capacity of MoO(2) and the better electroactivity of WO(2).</P>

Mechanism of lithium storage in MoS2 and the feasibility of using Li2S/Mo nanocomposites as cathode materials for lithium-sulfur batteries.

Fang, Xiangpeng,Guo, Xianwei,Mao, Ya,Hua, Chunxiu,Shen, Lanyao,Hu, Yongsheng,Wang, Zhaoxiang,Wu, Feng,Chen, Liquan Wiley-VCH 2012 Chemistry, an Asian journal Vol.7 No.5

<P>The most-popular strategy to improve the cycling stability and rate performance of the sulfur electrode in lithium-sulfur (Li-S) batteries is to astrict the sulfur in a conducting medium by using complicated chemical/physical processing. Lithium sulfide (Li(2)S) has been proposed as an alternative electrode material to sulfur. However, for its application, it must meet challenges such as high instability in air together with all of the drawbacks of a sulfur-containing electrode. Herein, we report the feasibility of using Li(2)S, which was obtained by electrochemical conversion of commercial molybdenum disulfide (MoS(2)) into Li(2)S and metallic molybdenium (Mo) at low voltages, as a high-performance active material in Li-S batteries. Metallic Mo prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. Therefore, the in situ electrochemically prepared Li(2)S/Mo composite exhibited both high cycling stability and high sulfur utilization.</P>

Carbon Dioxide and Oxygen Gas Sensors-Possible Application for Monitoring Quality, Freshness, and Safety of Agricultural and Food Products with Emphasis on Importance of Analytical Signals and Their Transformation

Meng, Xiangpeng,Kim, Saehoon,Puligundla, Pradeep,Ko, Sanghoon 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.6

Intelligent packaging technologies are rapidly gaining interest in the agriculture and food industries. Intelligent packaging for agricultural and food products has great potential to improve the shelf life and safety of agricultural and food products apart from its basic functions of keeping the products clean and protecting against unwanted physical and chemical changes. Intelligent packaging components are not limited to radio frequency identification (RFID) sensors, time-temperature indicators, ripeness indicators, and biosensors. Carbon dioxide, oxygen gas sensors and nanobiosensor can be used for real-time monitoring of freshness or quality for agricultural and food products. In this review, details of different sensors that are primarily used for carbon dioxide or oxygen gas sensing and their possible potential to be incorporated into agricultural and food packaging for product quality monitoring are discussed. In addition, special emphasis is placed on detailing the importance of analytical signals and their transformation, because these aspects play crucial role in monitoring the quality and freshness of agricultural and food products via intelligent packaging systems. Signal transducers contribute to the establishment of communication between the product quality sensor and the communication components such as RFID sensors in smart packaging systems by converting a signal in one form of energy to another form.

포장식품의 이산화탄소 농도 검출을 위한 키토산 현탁액의 지시능 향상

맹상붕 ( Xiangpeng Meng ),정준호 ( Junho Jung ),고상훈 ( Sanghoon Ko ) 한국산업식품공학회 2016 산업 식품공학 Vol.20 No.3

The purposes of this study are to develop a chitosan suspension for the carbon dioxide (CO₂) concentration indication of packaged food and to investigate the changes in the CO₂ indication corresponding to 2-amino-2-methylpropan- 1-ol (AMP) or 2-aminoethanol (monoethanolamine, MEA) addition. Chitosan suspension was prepared by adding chitosan (0.1, 0.2, and 0.4%) to distilled water and subsequently the pH of the suspension was adjusted to 7.0 after the addition of AMP or MEA. Changes in the pH and the turbidity of the chitosan suspension were measured over time under exposure in a normal atmosphere or 100% carbon dioxide environment. The pH of the chitosan suspension exposed at 100% carbon dioxide environment decreased rapidly up to approximately 6.3 in the initial CO₂ exposure. The transmittance values of 0.1 and 0.2% chitosan suspensions with 5% AMP increased from 32 to 99% and from 19 to 86%, respectively. The addition of 5% AMP improved the visual indication performance of the chitosan suspension since it increased significantly the width of the transmittance value before and after CO₂ exposure. The chitosan suspension with AMP has a potential to be used as a quality indicator of the packaged foods which produce carbon dioxide during storage and distribution.