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Experimental deployment and validation of a distributed SHM system using wireless sensor networks
Castaneda, Nestor E.,Dyke, Shirley,Lu, Chenyang,Sun, Fei,Hackmann, Greg Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.6
Recent interest in the use of wireless sensor networks for structural health monitoring (SHM) is mainly due to their low implementation costs and potential to measure the responses of a structure at unprecedented spatial resolution. Approaches capable of detecting damage using distributed processing must be developed in parallel with this technology to significantly reduce the power consumption and communication bandwidth requirements of the sensor platforms. In this investigation, a damage detection system based on a distributed processing approach is proposed and experimentally validated using a wireless sensor network deployed on two laboratory structures. In this distributed approach, on-board processing capabilities of the wireless sensor are exploited to significantly reduce the communication load and power consumption. The Damage Location Assurance Criterion (DLAC) is used for localizing damage. Processing of the raw data is conducted at the sensor level, and a reduced data set is transmitted to the base station for decision-making. The results indicate that this distributed implementation can be used to successfully detect and localize regions of damage in a structure. To further support the experimental results obtained, the capabilities of the proposed system were tested through a series of numerical simulations with an expanded set of damage scenarios.
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Cations Modulate Actin Bundle Mechanics, Assembly Dynamics, and Structure
Castaneda, Nicholas,Zheng, Tianyu,Rivera-Jacquez, Hector J.,Lee, Hyun-Ju,Hyun, Jaekyung,Balaeff, Alexander,Huo, Qun,Kang, Hyeran American Chemical Society 2018 The Journal of physical chemistry B Vol.122 No.14
<P>Actin bundles are key factors in the mechanical support and dynamic reorganization of the cytoskeleton. High concentrations of multivalent counterions promote bundle formation through electrostatic attraction between actin filaments that are negatively charged polyelectrolytes. In this study, we evaluate how physiologically relevant divalent cations affect the mechanical, dynamic, and structural properties of actin bundles. Using a combination of total internal reflection fluorescence microscopy, transmission electron microscopy, and dynamic light scattering, we demonstrate that divalent cations modulate bundle stiffness, length distribution, and lateral growth. Molecular dynamics simulations of an all-atom model of the actin bundle reveal specific actin residues coordinate cation-binding sites that promote the bundle formation. Our work suggests that specific cation interactions may play a fundamental role in the assembly, structure, and mechanical properties of actin bundles.</P> [FIG OMISSION]</BR>
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A STUDY OF USING CKKS HOMOMORPHIC ENCRYPTION OVER THE LAYERS OF A CONVOLUTIONAL NEURAL NETWORK MODEL
( Sebastian Soler Castaneda ),( Kevin Nam ),( Youyeon Joo ),( Yunheung Paek ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.1
Homomorphic Encryption (HE) schemes have been recently growing as a reliable solution to preserve users’ information owe to maintaining and operating the user data in the encrypted state. In addition to that, several Neural Networks models merged with HE schemes have been developed as a prospective tool for privacypreserving machine learning. Those mentioned works demonstrated that it is possible to match the accuracy of non-encrypted models but there is always a trade-off in the computation time. In this work, we evaluate the implementation of CKKS HE scheme operations over the layers of a LeNet5 convolutional inference model, however, owing to the limitations of the evaluation environment, the scope of this work is not to develop a complete LeNet5 encrypted model. The evaluation was performed using the MNIST dataset with Microsoft SEAL (MSEAL) open-source homomorphic encryption library ported version on Python (PyFhel). The behavior of the encrypted model, the limitations faced and a small description of related and future work is also provided.
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Diego L. Castaneda?Saldarriaga,Joham Alvarez?Montoya,Vladimir Martinez?Tejada,Julian Sierra?Perez 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.1
Self-sensing concrete materials, also known as smart concretes, are emerging as a promising technological development for the construction industry, where novel materials with the capability of providing information about thestructural integrity while operating as a structural material are required. Despite progress in the field, there are issues related to the integration of these composites in full-scale structural members that need to be addressed before broad practical implementations. This article reports the manufacturing and multipurpose experimental characterization of a cement-based matrix (CBM) composite with carbon nanotube (CNT) inclusions and its integration inside a representative structural member. Methodologies based on current–voltage (I–V) curves, direct current (DC), and biphasic direct current (BDC) were used to study and characterize the electric resistance of the CNT/CBM composite. Their self-sensing behavior was studied using a compression test, while electric resistance measures were taken. To evaluate the damage detection capability, a CNT/CBM parallelepiped was embedded into a reinforced-concrete beam (RC beam) and tested under three-point bending. Principal finding includes the validation of the material’s piezoresistivity behavior and its suitability to be used as strain sensor. Also, test results showed that manufactured composites exhibit an Ohmic response. The embedded CNT/CBM material exhibited a dominant linear proportionality between electrical resistance values, load magnitude, and strain changes into the RC beam. Finally, a change in the global stiffness (associated with a damage occurrence on the beam) was successfully self-sensed using the manufactured sensor by means of the variation in the electrical resistance. These results demonstrate the potential of CNT/CBM composites to be used in real-world structural health monitoring (SHM) applications for damage detection by identifying changes in stiffness of the monitored structural member.
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Experimental deployment and validation of a distributed SHM system using wireless sensor networks
Nestor E. Castaneda,Shirley Dyke,Chenyang Lu,Fei Sun,Greg Hackmann 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.32 No.6
Recent interest in the use of wireless sensor networks for structural health monitoring (SHM) is mainly due to their low implementation costs and potential to measure the responses of a structure at unprecedented spatial resolution. Approaches capable of detecting damage using distributed processing must be developed in parallel with this technology to significantly reduce the power consumption and communication bandwidth requirements of the sensor platforms. In this investigation, a damage detection system based on a distributed processing approach is proposed and experimentally validated using a wireless sensor network deployed on two laboratory structures. In this distributed approach, on-board processing capabilities of the wireless sensor are exploited to significantly reduce the communication load and power consumption. The Damage Location Assurance Criterion (DLAC) is used for localizing damage. Processing of the raw data is conducted at the sensor level, and a reduced data set is transmitted to the base station for decision-making. The results indicate that this distributed implementation can be used to successfully detect and localize regions of damage in a structure. To further support the experimental results obtained, the capabilities of the proposed system were tested through a series of numerical simulations with an expanded set of damage scenarios.
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고정환,Rodrigo Castaneda,주선우,김형근,이영근,이윤형,강동호,백남인 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.4
A preliminary study revealed that a 10 lg/mL n- BuOH fraction of Malva verticillata aerial parts significantly enhanced splenocyte proliferation and induced significant enhancement of natural-killer (NK) cell activity against tumor cells (YAC-1). This study was initiated to identify the principal components that exhibited these activities, and four glycerides were isolated through repeated SiO2 and ODS column chromatography. Structures of compounds 1–4 were determined to be (2S)-1-O-palmitoyl glyceride, (2S)-1-O-stearoyl glyceride, (2S)-1-O-linolenoyl glyceride, and (2S)-1,2-di-O-linoleoyl glyceride, respectively. Compounds 1–3 showed potential immune-enhancing activity in murine splenocyte and natural-killer (NK) cells at 10 lM. In contrast, compound 4 showed weak activity, indicating the monoacyl glycerides (1–3) are more effective than diacyl glyceride (4). Also, the longer the carbon number of the fatty acid in monoacyl glyceride, the better the activity, and the monoacyl glyceride including an unsaturated fatty acid (3) is more effective than the glycerides including the saturated fatty acids (1– 2).
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Deposition-Temperature Dependence of ZnO/Si Grown by Pulsed Laser Deposition
손창식,김영환,Homero Castaneda LOPEZ,최인훈,Ki Hyun YOON,Sang-Mun KIM,김성일,Yong Tae KIM 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
We have investigated structural and optical properties of ZnO lms deposited on (100) Si substrates at various deposition temperatures by pulsed laser deposition. All the ZnO lms show columnar structure due to the growth behavior of ZnO; the (0001) plane has the fastest growth rate, but on increasing the deposition temperature the lm texture varies from c-axis orientation normal to substrate surface to random orientation. This tendency can be explained by the negative activation energy evaluated from growth rate as a function of inverse deposition temperature, which implies that ZnO lms are grown in a surface-kinetics-limited regime. FWHM of the UV-emission peak does not change at various deposition temperatures, and its mean value is about 115 meV. In contrast to FWHM, the intensity of UV emission drastically increases with increasing deposition temperature, due to the reduction of grain-boundary recombination effect.
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Julie Bornhoeft,Debra Castaneda,Tricia Nemoseck,Piwen Wang,Susanne M. Henning,Mee Young Hong 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.8
Acute and chronic inflammation and dyslipidemia play a critical role in the development of various diseases,including cardiovascular disease. Green tea polyphenols possess potent antioxidative and anti-inflammatory properties that contribute to the beneficial effects on heart health. The present study was carried out to determine if administration of a green tea extract (Polyphenon E [PPE]; Mitsui Norin Co., Ltd., Tokyo, Japan) at 0.2% in the diet reduces cardiovascular risk factors, including dyslipidemia, inflammation, adiposity, and oxidative stress, in rats fed an atherogenic (high fat, cholesterol,and sugar) diet with dextran sodium sulfate (DSS) in drinking water. DSS treatment increased serum total cholesterol, lowdensity lipoprotein (LDL)-cholesterol, C-reactive proteins (CRP), and markers of liver toxicity and decreased high-density lipoprotein (HDL)-cholesterol significantly. Adding PPE to the atherogenic diet (PPE-diet) was associated with lower total cholesterol and LDL-cholesterol (P < .001) and increased HDL-cholesterol (P = .001). In addition, the PPE-diet was associated with decreased serum CRP concentration (P = .023) and increased total antioxidant capacity (P = .016) and catalase (P = .001)and glutathione peroxidase (P = .050) activities. The PPE-diet significantly lowered epididymal fat pad weight (P = .009). Feeding the PPE-diet also ameliorated some of the DSS-induced lipid, inflammatory, and oxidative symptoms. In summary,green tea supplementation decreased several cardiovascular risk factors, including body composition, dyslipidemia, inflammatory status, and antioxidant capacity, in rats fed an atherogenic diet. This study supports green tea as an effective dietary component for sustaining cardiovascular health.
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