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Tin Trung Tran,Trung Xuan Pham,김종욱 대한임베디드공학회 2017 대한임베디드공학회논문지 Vol.12 No.2
One of the important applications of activity sensing in the home is energy monitoring. Many previous methodologies for detecting and recognizing household appliances have been proposed. This paper presents an approach that uses an energy metering circuit (EMC) to classify and identify the various electrical devices in home based on root-mean-square (RMS) consumed current value. EMC gathers the RMS current values created by appliance state transition (e.g., on to off) and apparatus operating process. In this paper, an identification algorithm is proposed to detect a change in current levels using the standard deviation of current signals and their average values. In addition, characteristic of the appliance is extracted concerning four feature parameters concerning the number of current levels, the minimum level, the maximum level, and signal-to-noise ratio (SNR) of them. Experiment results validate the reliable performance of the proposed identification method for 11 representative appliances.
Measurement of Current Magnitude for Home Appliances using Smart E-Meter
Tran Trung-Tin(트란 트렁 틴),Pham Xuan-Trung(팜 수안 트렁),Ngo Minh-Tri(능오 밍 트리),Jong-Wook Kim(김종욱) 한국정보기술학회 2015 Proceedings of KIIT Conference Vol.2015 No.6
본 논문은 Smart E-Meter를 이용해서 방안에 있는 가전제품의 전류 값을 관찰하고 측정하는 것이 가능한 데이터측정(DAQ) 시스템을 제안한다. 제안된 DAQ 시스템은 Smart E-Meter 장치를 사용하고 소프트웨어는 LabVIEW의 VISA 함수를 사용해서 설계되었다. 그리고 제안된 시스템으로 각 전자제품의 전류 변화를 데이터 파일로 만들 수 있으며, 최신 전류 데이터에 창을 씌워 전류의 이동평균과 이동표준편차를 계산함으로써 현재 연결되어 있는 가전제품이 가동 시작, 정상 운용, 모드 변화 중 어느 단계인지를 판단하게 할 수 있다. 제안된 시스템은 Smart E-Meter 시제품을 이용해서 실현 가능성을 검증받는다. This paper proposes a data acquisition (DAQ) system to observe and monitor the magnitude value of current signal for in-home appliances in a room based on Smart E-Meter. The DAQ system included DAQ device with Smart E-Meter and DAQ software designed by LabVIEW with the VISA function. In addition, this analysis tool produces the current profile of each electric appliances. Based on the profile, the moving average and moving standard deviation values are utilized to evaluate the current magnitude by sliding a window for most recent data. Specifically, consideration of the difference in current magnitude allows to determine the status of the connected appliances which are starting-up, working or adjusting operation mode. The proposed approach is validated through operating experiment with the prototype of Smart E-Meter.
Micropropagation from root segments to improve seedling quality in Chinese foxglove crops
Thanh Loan Pham,Van Huy Nguyen,Thi Le Thu Hoang,Thi Tam Tien Ha,Trung Kien Tran,Xuan Duong Vu,Phi Bang Cao,Quang Trung Nguyen 한국식물생명공학회 2020 JOURNAL OF PLANT BIOTECHNOLOGY Vol.47 No.3
This is the first study to establish a complete protocol for micropropagation of Rehmannia glutinosa from root segments. The study involved investigating the effect of plant growth regulators on in vitro shoot regeneration and rooting and identifying substrates supporting survival and growth performance of ex vitro seedlings. A Murashige and Skoog (MS) medium containing 30 g/L sucrose for shoot induction and 0.2 mg/L indole-3-acetic acid (IAA), 1 mg/L 6-benzylaminopurine (BAP), and 1 g/L polyvinylpyrrolidone (PVP) for shoot multiplication resulted in the highest number of shoots per explant and shoot height. Applying a medium containing 0.5 mg/L IAA and 1 g/L PVP yielded optimal rooting of the shoots grown in vitro. Compost enriched with microbial inoculants and perlite enhanced seedling growth better than that with organic biofertilizer-free substrates (soil and sand). We recommend the continuous production of micropropagated R. glutinosa seedlings from root segments under the aforementioned conditions as a possible propagation technique for crops of this species.
Tran, Tin Trung,Pham, Trung Xuan,Kim, Jong-Wook Institute of Embedded Engineering of Korea 2017 대한임베디드공학회논문지 Vol.12 No.2
One of the important applications of activity sensing in the home is energy monitoring. Many previous methodologies for detecting and recognizing household appliances have been proposed. This paper presents an approach that uses an energy metering circuit (EMC) to classify and identify the various electrical devices in home based on root-mean-square (RMS) consumed current value. EMC gathers the RMS current values created by appliance state transition (e.g., on to off) and apparatus operating process. In this paper, an identification algorithm is proposed to detect a change in current levels using the standard deviation of current signals and their average values. In addition, characteristic of the appliance is extracted concerning four feature parameters concerning the number of current levels, the minimum level, the maximum level, and signal-to-noise ratio (SNR) of them. Experiment results validate the reliable performance of the proposed identification method for 11 representative appliances.
Quoc Tuan Hoang,Xuan Hien Pham,Anh Vu Le,Trung Thanh Bui 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.3
Diagnosing breast diseases using ultrasound (US) images remains challenging because it is time-consuming and requires expert radiologist knowledge. As a result, the diagnostic performance is significantly biased. To assist radiologists in this process, computer-aided diagnosis (CAD) systems have been developed and used in practice. This type of system is used not only to assist radiologists in examining breast ultrasound images (BUS) but also to ensure the effectiveness of the diagnostic process. In this study, we propose a new approach for breast lesion localization and segmentation using a multi-scale pyramid of the ultrasound image of a breast organ and a convolutional semantic segmentation network. Unlike previous studies that used only a deep detection/segmentation neural network on a single breast ultrasound image, we propose to use multiple images generated from an input image at different scales for the localization and segmentation process. By combining the localization/segmentation results obtained from the input image at different scales, the system performance was enhanced compared with that of the previous studies. The experimental results with two public datasets confirmed the effectiveness of the proposed approach by producing superior localization/segmentation results compared with those obtained in previous studies.
Tae-Yong Lee,Pham Xuan Trung,Jong-Wook Kim,Yong-Jae Kim,Sang-Yong Jung IEEE 2016 IEEE transactions on magnetics Vol.52 No.3
<P>The optimal design of electric machines requires a significant amount of computation time, since the design is usually performed based on finite-element analysis (FEA) for better accuracy. For this reason, the development of an optimization algorithm is regarded as a prerequisite to reduce the number of objective function call, which is directly related to computation time. The local search algorithm does not guarantee that the global optimum solution can be searched effectively. Therefore, in this paper, we introduce the novel optimization method, search region management (SRM), to improve the efficiency of the local search algorithm. SRM uses a guided random bit generation based on Gray code for the region selection when the local search iterates the optimum search process for a multi-start. In addition, the SRM saves and manages the information of previous searched points to prevent overlapping calculation and to increase the effectiveness of the local search during every iteration process. To clarify the effectiveness of the proposed method for electric machine design, it is applied to the optimal design of brushless dc motor coupled with FEA minimizing torque ripple.</P>
A Design of Magnetic Resonant Wireless Power Transfer System using Flexible Resonator Coils
Manh Kha Hoang,Xuan Thuc Kieu,Xuan Thanh Pham,Trung Kien Vu,Thanh Son Pham 한국자기학회 2023 Journal of Magnetics Vol.28 No.3
This paper presents a design of magnetic resonant wireless power transfer (MR-WPT) system operating at 6.78 MHz with flexible resonator coils. The resonator coils are fabricated on an FR-4 substrate with a very thin thickness of 0.2 mm; therefore, they can be bent at various angles. With the bendable resonator coils, the configuration of the MR-WPT system will be more flexible, thereby increasing the applicability. However, the inductance, resistance, quality factor, and mutual inductance of the coils will be changed with the bending angle, thereby affecting the performance of the MR-WPT system. Detailed investigations of these changes were conducted by both simulation and experiment. Thus MR-WPT systems with flexible resonators can be designed for optimum performance. This proposed MR-WPT system can be applied in situations where system configuration requires high flexibility. Moreover, a bent resonator system can perform better than a flat resonator system in the inward bending configuration.
ĐÁNH GIÁ KHẢ NĂNG LÀM LÀNH VẾT BỎNG TRÊN CHUỘT CỦA HYDROGEL TỪ AgNP-CHITOSAN-CURCUMIN
Hoang Ngoc Anh Nhan,Nguyen Ba Trung,Giang Thi Kim Lien,Truong Thi My Phuong,Ho Kha Vinh Nhan,Pham Xuan Anh 한국베트남학회 2023 베트남연구 Vol.21 No.1
Skin burn is one of the major causes of morbidity and mortality in burn patients due to its susceptibility to infection. The disruption of the epidermal barrier, combined with the denaturation of proteins and lipids, provides a fertile environment that is rich in bacterial nutrients for microbial growth, making it significantly prone to infection. This study aimed to formulate a thermoresponsive hydrogel containing silver nanoparticles (300 ppm), oligo chitosan 2%, and curcumin (0.1%) in the polymer pluronic F127 matrix with a final concentration of 13% to effectively promote the healing of skin wounds. The prepared thermoresponsive hydrogel was investigated for its physical and chemical stability, gelation temperature, and chemical composition. In addition to in vitro antibacterial activity against Staphylococcus aureus found in burn infections, in vivo burn healing and antibacterial activities were also investigated and compared with those of a commercial product using burn-induced infected wounds in mice. The formulation showed antibacterial activity with effective values for wound healing properties, as shown in vivo and by histopathological studies. This study also demonstrates that the thermoresponsive hydrogel was successful as an antibacterial and burned wound-healing transdermal drug delivery system.