Article
Engineering, Manufacturing
Joaquim Manoel Justino Netto, Amir Ilkiu Sarout, Andre Luiz Grando Santos, Alessandra de Almeida Lucas, Marcelo Aparecido Chinelatto, Jorge Lino Alves, Antonio Gaspar-Cunha, Jose Antonio Covas, Zilda de Castro Silveira
Summary: This paper presents the design and validation of an innovative 3D printer with a co-rotating twin screw extrusion unit, which offers improved mixing capacity and process flexibility. The feasibility of the design was verified through numerical calculations and extrusion tests, and successful printing of various samples was achieved.
ADDITIVE MANUFACTURING
(2022)
Article
Automation & Control Systems
Thomas May, Babak Eslami, Kamran Fouladi
Summary: Additive manufacturing is widely used across various industries, and this study focused on improving print quality by optimizing humidity distribution using computational fluid dynamics and experimental testing. The optimized enclosure designed in the study significantly increased humidity uniformity in the print volume and showed positive effects on the mechanical properties of printed parts.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Polymer Science
Tomas Tichy, Ondrej Sefl, Petr Vesely, Karel Dusek, David Busek
Summary: The study presents a mathematical model based on the finite element method to describe the temperature distribution in different parts of a 3D printer during operation. The model provides users with the material's thermal history and estimates property changes during the printing process. Results include static and dynamic model variants, as well as simulations of PLA filament printing at different speeds.
Article
Engineering, Manufacturing
Julian Kattinger, Mike Kornely, Julian Ehrler, Christian Bonten, Marc Kreutzbruck
Summary: This paper presents in-situ X-ray computed tomography experiments to study the flow behavior within a conventional hot-end of a fused filament fabrication printer. The experiments provide insights into the melt and flow behavior, offering potential for improving nozzle design. The presented experimental method can also serve as a valuable tool for validating more complex numerical simulations.
ADDITIVE MANUFACTURING
(2023)
Article
Instruments & Instrumentation
Qing Zhou, He Huang, Chuan Wu, Guojun Wen, Bin Liu
Summary: The research introduces a self-powered drill pipe sensor based on triboelectric nanogenerators for real-time measurement of rotation speed and direction, showing high measurement accuracy and reliability.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Engineering, Manufacturing
J. Jamari, D. F. Fitriyana, P. S. Ramadhan, S. Nugroho, R. Ismail, A. P. Bayuseno
Summary: This research aimed to construct interference screws using 3D printing filaments (HA, PLA, and PCL) at different nozzle temperatures. Various tests were conducted to characterize the screws, including density tests, torsion tests, fracture analysis, and biodegradable tests. A finite element model was also established and compared with a commercial screw. The study found that the interference screw prepared in this study had the best fit for implants in terms of density within the range of cortical bone density. However, the commercial screw outperformed the interference screw in terms of torque efficiency in the clamping failure area and showed faster deterioration.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Instruments & Instrumentation
E. Persembe, C. Parra-Cabrera, C. Clasen, R. Ameloot
Summary: The limited control over the printing process in commercial powder bed 3D printers hampers the exploration of novel materials and applications. A custom binder-jetting 3D printer was developed in this study to enable fine-grained control over the printing process. An optimized protocol was developed for new build materials and binders, with resolution tests used as a guideline for improving dimensional accuracy. The demonstration of printing a functionally graded object showcased the voxel-based control over the printing process.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Materials Science, Composites
Behnam Akhoundi, Mojtaba Nabipour, Omid Kordi, Faramarz Hajami
Summary: This research examines the innovative task of printing speed optimization for continuous fiber composites. Based on experimental analysis, the optimal printing speed is computed and proven effective in producing high-quality printed composites with different geometric shapes.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Business
Rebecca Downes, Urs Daellenbach, Noelle Donnelly
Summary: Remote work offers an opportunity to examine organizational control theory, and findings suggest that managers in distributed teams rely heavily on monitoring attitudes, leading to propositions for further development of theories on informal control.
JOURNAL OF BUSINESS RESEARCH
(2023)
Article
Engineering, Mechanical
Kaivan Mohammadi, Mohammad R. Movahhedy, Saeed Khodaygan
Summary: EHD 3D printing technology utilizes metallic ink to form Taylor jets for manufacturing submicron-size structures, with a focus on studying particles reaction and aggregate formation in ink during printing. Experimentally validated Finite Element model revealed vortex flow in ink jet and the impact of key parameters on aggregate formation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Elif Yurttas, Nadir Ayrilmis
Summary: This study investigates the effects of thermal treatment and silver nanoparticles on the mechanical and thermal properties of additively manufactured wood/PLA specimens. The results show that thermal treatment improves the interfacial adhesion between wood and polymer matrix, leading to enhanced mechanical properties. Additionally, the addition of silver nanoparticles contributes to improved mechanical performance and is more compatible with thermally treated wood.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Polymer Science
Lorenzo Paleari, Mario Bragaglia, Francesco Fabbrocino, Raimondo Luciano, Francesca Nanni
Summary: In this study, PEEK carbon-nanotube (CNT) self-monitoring composites with different levels of filler loading were extruded as 3D-printable filaments. The resulting composites showed varying gauge factor values depending on the filler loading. 3D-printed PEEK 3CNT and PEEK 5CNT composites exhibited piezo-resistive behavior and had average gauge factors of 4.46 and 2.03, respectively.
Article
Automation & Control Systems
Yunsong Xu, Han Yu, Zhengen Zhao
Summary: This article addresses the problem of monitoring performance variations in a smart automatic feedback control system and proposes a method to quantify the performance variations using symmetric positive-definite kernel matrices on a Riemannian manifold.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2023)
Article
Cardiac & Cardiovascular Systems
Fabrizio Guarracini, Massimiliano Maines, Felice Nappi, Gennaro Vitulano, Massimiliano Marini, Francesco Urraro, Fabio Franculli, Paola Napoli, Daniele Giacopelli, Maurizio Del Greco, Massimo Giammaria
Summary: This study retrospectively analyzed arrhythmic episodes transmitted by a remote monitoring system in patients with implantable cardiac monitors. The study found a high number of arrhythmic episodes and a high false positive rate, suggesting the need for algorithm improvements to enhance the accuracy of transmissions.
INTERNATIONAL JOURNAL OF CARDIOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Gabriel Avelino R. Sampedro, Danielle Jaye S. Agron, Gabriel Chukwunonso Amaizu, Dong-Seong Kim, Jae-Min Lee
Summary: This paper proposes a real-time process monitoring system that accurately predicts abnormal behaviors in additive manufacturing, such as nozzle clogging. By using collaborative sensors to collect data and machine learning algorithms for processing and classification, the system achieves accurate prediction of future behavior of 3D printers, reducing printing failures and resource waste.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Sivalingam Ramesh, Young-Jun Lee, Kyeongho Shin, Lama Sanjeeb, K. Karuppasamy, Dhanasekaran Vikraman, Adaikalam Kathalingam, Hyun-Seok Kim, Heung Soo Kim, Joo-Hyung Kim
Summary: In this study, Co3O4/RuO2@nitrogen-doped graphene oxide (NGO) composite materials were successfully synthesized for supercapacitor and gas sensor applications. The synthesized composites showed nanostructured grains anchored on the NGO surface, exhibiting good electrochemical performance and potential applications in supercapacitors and gas sensors.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Sivalingam Ramesh, K. Karuppasamy, Dhanasekaran Vikraman, Eunhyun Kim, Lama Sanjeeb, Young-Jun Lee, Hyun-Seok Kim, Joo-Hyung Kim, Heung Soo Kim
Summary: A nano-sized cobalt oxide decorated nitrogen-doped graphene oxide (Co3O4@NGO) composite was synthesized for electrochemical supercapacitors and gas sensor applications, showing excellent specific capacitance and stability.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Environmental Sciences
Seohyun Jang, Joo-Hyung Kim, Jihyun Kim
Summary: This study analyzed the spectral properties of plastic particles using mathematical methods, achieving the detection of plastic particles in water or ice. The identification precision of each plastic can reach up to 81% by compensating based on the spectral properties.
Article
Chemistry, Analytical
Sanjeeb Lama, Jinuk Kim, Sivalingam Ramesh, Young-Jun Lee, Jihyun Kim, Joo-Hyung Kim
Summary: Nanostructured materials synthesized by hydrothermal and thermal reduction processes were used to detect the simulant for chemical warfare agents, DMMP. MnO2@NGO/PPy showed high sensitivity and selectivity, while N-MWCNT demonstrated good linearity. A comparison between a surface acoustic wave sensor and quartz crystal microbalance sensor revealed that the SAW sensor had over 100-times higher sensitivity.
Article
Chemistry, Multidisciplinary
Sung-Yoon Jung, Seung-Gi Kim, Joo-Hyung Kim, Se-Hoon Park
Summary: This study proposes a multifunctional myoelectric hand prosthesis system that uses only two EMG sensors, allowing upper limb amputees to perform various hand gestures and grip motions, improving convenience in daily life.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Taejin Lee, Kyeong-Ho Shin, Jihyun Kim, Dongsoo Jung, Joo-Hyung Kim
Summary: This study proposes an optimization design for the external variable compressor to switch from R134a to R1234yf, and evaluates the compressor performance through simulation and drop-in tests. Results show that replacing R134a with R1234yf leads to a slight decrease in cooling capacity and coefficient of performance under different operating conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Materials Science, Ceramics
Ramasubba Reddy Palem, Sivalingam Ramesh, Chinna Bathula, Vijay Kakani, Ganesh D. Saratale, Hemraj M. Yadav, Joo-Hyung Kim, Heung Soo Kim, Soo-Hong Lee
Summary: In this study, a composite material of CMC and CuO@MnO2 was synthesized using a thermal reduction method, showing unique morphology and excellent electrochemical properties with high specific capacitance and cycling stability.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Sivalingam Ramesh, K. Karuppasamy, Dhanasekaran Vikraman, P. Santhoshkumar, Chinna Bathula, Ramasubba Reddy Palem, A. Kathalingam, Hyun-Seok Kim, Joo-Hyung Kim, Heung Soo Kim
Summary: Sheet-like morphology of copper cobaltite/N-doped graphene oxide materials composite was synthesized by a thermal reduction process improved by sonication. These composite materials were fabricated as electrode for supercapacitor applications and showed excellent capacitance and cyclic stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Sanjeeb Lama, Sumita Subedi, Sivalingam Ramesh, Kyeongho Shin, Young-Jun Lee, Joo-Hyung Kim
Summary: A hybrid nanostructured composite was synthesized to detect simulant of nerve agents. The MnO2@CE/PPy composite showed high sensitivity, excellent linearity, and reversible adsorption and desorption phenomenon.
Article
Chemistry, Multidisciplinary
Sanjeeb Lama, Bong-Gyu Bae, Sivalingam Ramesh, Young-Jun Lee, Namjin Kim, Joo-Hyung Kim
Summary: This study synthesized hybrid composite materials for the detection of chemical warfare agents (CWAs) and evaluated their performance using quartz crystal microbalance (QCM) and surface acoustic wave (SAW) sensors. The findings showed that NGO@MnO2 and NGO@MnO2/PPy demonstrated high sensitivities and repeatability, making them potential candidates for CWA detection.
Article
Engineering, Electrical & Electronic
Jihyun Kim, Joo-Hyung Kim
Summary: This article introduces a continuous operating pre-concentrator for trace gas analysis, which can achieve a significant increase in trace gas concentrations using relatively simple mass diffusion separation stages, without interrupting the gas flows. The pre-concentrator is useful in detecting the real-time variations in trace gas concentration and requires less operational time.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Chemistry, Multidisciplinary
Sivalingam Ramesh, C. Karthikeyan, A. S. Hajahameed, N. Afsar, Arumugam Sivasamy, Young-Jun Lee, Joo-Hyung Kim, Heung Soo Kim
Summary: Zinc oxide nanoparticles were synthesized using a simple chemical route and characterized by XRD, SEM, and EDS analysis. The addition of 4-dimethylaminobenzaldehyde (4DB) increased the band gap energy of the nanoparticles. HOMO-LUMO analysis was conducted on the synthesized clusters, providing information about their ionization energy, electron affinity, and other thermodynamic properties. The antimicrobial properties of the nanoparticles were studied against different bacteria.
Article
Materials Science, Multidisciplinary
Miae Kang, Jin Hyun Park, Ayeong Kim, Seongwoo Lee, Chang Young Lee, Joo-Hyung Kim, Changsik Song, Han Yong Bae, Jihyun Kim
Summary: Early detection of chemical warfare agents is crucial. This study introduces a fast response-recovery chemicapacitor for a nerve agent simulant with high selectivity and sensitivity. The chemicapacitor outperforms chemiresistive sensors in terms of response-recovery dynamics and exhibits superior sensitivity. It also demonstrates excellent selectivity for the nerve agent simulant and shows potential in reducing casualties by early identification of chemical threats.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Sivalingam Ramesh, K. Karuppasamy, H. M. Yadav, Young-Jun Lee, Arumugam Sivasamy, A. Kathalingam, Hyun-Seok Kim, Joo-Hyung Kim, Heung Soo Kim
Summary: This article thoroughly examines the electrochemical properties of ternary CuCo2S4 sulfides as electrode materials due to their low cost, high conductivity, and synergistic impact. By utilizing a hydrothermal reaction process aided by nanostructured CuCo2S4 secured on multiwalled carbon nanotubes/polypyrrole composite, the produced composite electrode displays increased specific capacitances and cyclic stability. The increased surface and morphological features of the CuCo2S4 on NMWCNT/PPy composite boost the electrochemical properties of the ternary composite electrode.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Multidisciplinary
Siheon Jeong, Min-Gwan Kim, Joo-Hyung Kim, Ki-Yong Oh
Summary: This study proposes a thermal monitoring method using an infrared camera mounted on a UAV to inspect the health state of overhung transmission lines in outdoor environments. The method includes converting the thermal energy of the transmission lines into accurate temperature, eliminating thermal energy from other heat sources, and automatically tracking the lines for reliable thermal imaging. Field tests show that the proposed method overcomes current limitations and provides important insights for thermally monitoring overhung TLs in outdoor environments.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
