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Kim, Taehoon,Kim, Juyong,Cho, Jintae,Jung, Jae-Seung The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.3
Voltage stabilization is an essential component of power quality in low voltage DC (LVDC) microgrid. The microgrid demands the interconnection of a number of small distributed power resources, including variable renewable generators. Therefore, the voltage can be maintained in a stable manner through the control of these distributed generators. In this study, we did research on the new advanced operating method for a photovoltaic (PV) simulator in order to achieve interconnection to a bipolar LVDC microgrid. The validity of this voltage stabilization method, using the distributed generators, is experimentally verified. The test LVDC microgrid is configured by connecting the developed PV simulator and DC load, DC line, and AC/DC rectifier for connecting the main AC grid. The new advanced control method is applied to the developed PV simulator for the bipolar LVDC grid in order to stabilize the gird voltage. Using simulation results, the stabilization of the grid voltage by PV simulator using the proposed control method is confirmed the through the simulation results in various operation scenarios.
Power Flow Calculation Method of DC Distribution Network for Actual Power System
Kim, Juyong,Cho, Jintae,Kim, Hongjoo,Cho, Youngpyo,Lee, Hansang Korea Electric Power Corporation 2020 KEPCO Journal on electric power and energy Vol.6 No.4
DC distribution system has been evaluated as an excellent one in comparison with existing AC distribution network because it needs fewer power conversion stages and the full capacity of the equipment can be used without consideration for power factor. Recently, research and development on the implementation of DC distribution networks have been progressed globally based on the rapid advancement in power-electronics technology, and the technological developments from the viewpoint of infrastructure are also in progress. However, to configure a distribution network which is a distribution line for DC, more accurate and rapid introduction of analysis technology is needed for the monitoring, control and operation of the system, which ensure the system run flexible and efficiently. However, in case of a bipolar DC distribution network, there are two buses acting as slack buses, so the Jacobian matrix cannot be configured. Without solving this problem, DC distribution network cannot be operated when the network is unbalanced. Therefore, this paper presented a comprehensive method of analysis with consideration of operating elements which are directly connected between neutral electric potential caused by the unbalanced of load in DC distribution network with bipolar structure.
김형두,김종진,김윤화,홍은경,안승혜,박용구,박영희,이주희,원남희,서진태,지현숙,양문호,이중달 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 1983 東西醫學硏究所 論文集 Vol.2 No.1
Twelve consecutive cases of chondrosarcoma and its histologic variants are analyzed histopathologically and include seven cases of ordinary(classic) type, two cases of mesenchymal type, one case of clear cell type and two cases of peripheral secondary type arising from one of multiple osteochondromas. One of seven classic chondrosarcomas is classified as dedifferentiated chondrosarcoma, which recurred locally five years after initial surgical removal. Histologic features of the variants are described in details, and differential points on histologic findings and clinical manifestation as well are discussed.
Jintae Park,Sora Baek,Gowun Kim,Seung-Joo Nam,Ji Hyun Kim 대한재활의학회 2022 Annals of Rehabilitation Medicine Vol.46 No.5
Objective To investigate esophageal motility disorders in patients with esophageal residual barium on chest x-rays after videofluoroscopic swallowing studies (VFSS) through high-resolution esophageal manometry (HREM).Methods We reviewed the records of 432 patients who underwent VFSS from September 2019 to May 2021, and 85 patients (19.7%) with large residual barium (diameter ≥1 cm) were included. As a result of HREM, motility disorders were classified as major or minor motility disorders according. Esophagogastroduodenoscopy and chest computed tomography results available were also reviewed.Results Among 85 patients with large residual barium in the esophagus, 16 patients (18.8%) underwent HREM. Abnormal esophageal motilities were identified in 68.8% patient: three patients (18.8%) had major motility disorders—achalasia (n=1), esophagogastric junction (EGJ) outflow obstruction (n=2)—and eight patients (50%) had minor motility disorders—ineffective esophageal motility (n=7), fragmented peristalsis (n=1). In those with normal esophageal motility, three patients of esophageal structure disorders (18.8%)—esophageal cancer (n=1), cardiogenic dysphagia (n=1), slight narrowing without obstruction of EGJ (n=1)—and two patients (12.5%) with chronic atrophic gastritis (n=2) were confirmed.Conclusion Esophageal motility disorders were identified in 68.8% of 16 patients with large esophageal residual barium with three patients in the major and eight patients in the minor categories. Residual barium in the esophagus was not rare and can be a sign of significant esophageal motility disorders.
A study on reliability assessment of a decay heat removal system for a sodium-cooled fast reactor
Kim, Jintae,Jae, Moosung Elsevier 2018 Annals of nuclear energy Vol.120 No.-
<P><B>Abstract</B></P> <P>Probabilistic risk assessment is expected to play a major role in the design and regulation framework for future reactors. Since the safety of a sodium-cooled fast reactor largely depends on the reliability of a decay heat removal system, which adopts a passive safety feature, it is necessary to assess the reliability of this system in order to conduct probabilistic risk assessment. Currently existing reliability assessment methodology is based on the probability of component failures and human errors. However, this design does not work as a passive safety system consisting of active components that do not need any external input to operate. In this study, a methodology for evaluating the reliability of a passive safety system that includes functional failure is proposed. The Prototype Gen-IV Sodium-cooled Fast Reactor that is currently under development in Korea was selected as the reference reactor, and the functional reliability of the decay heat removal system in the reactor was calculated by uncertainty propagation of the system parameters that can affect system failure. Sensitivity analysis was also performed to determine which parameters have crucial effects on system failure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The reliability of a decay heat removal system which is the passive system of a sodium-cooled fast reactor has been assessed using the functional failure concept. </LI> <LI> Latin hypercube sampling in conjunction with partial rank correlation coefficient method has been utilized for sensitivity analysis. </LI> <LI> Control rod drive line and reactor vessel expansion reactivity coefficient is/has been identified to have the greatest influence on the functional reliability of the decay heat removal system in the unprotected loss of heat sink accident. </LI> </UL> </P>
A New Filter-Bank Multicarrier System: The Linearly Processed FBMC System
Kim, Jintae,Park, Yosub,Weon, Sungwoo,Jeong, Jinkyo,Choi, Sooyong,Hong, Daesik IEEE 2018 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.17 No.7
<P>In this paper, we propose a linearly processed filter-bank multicarrier (LP-FBMC) system which employs faster than Nyquist signaling to remove residual intrinsic interferences. We represent the FBMC transceiver in a matrix form and then apply singular value decomposition-based linear transformation in order to convert the overlapped FBMC data into parallel independent interference-free data. This interference-free characteristic of the proposed LP-FBMC system enables the use of conventional multiple antenna configurations. Performance evaluations show that out-of-band emission performance of the proposed LP-FBMC system is superior to those of conventional quadrature amplitude-based FBMC (FBMC-QAM) and orthogonal frequency division multiplexing systems. Furthermore, the proposed LP-FBMC system outperforms the conventional FBMC-QAM in terms of bit error rate performance when high order modulation is employed under time-varying channel and multiuser uplink environment.</P>
Flow-enhanced electrochemical immunosensors on centrifugal microfluidic platforms.
Kim, Tae-Hyeong,Abi-Samra, Kameel,Sunkara, Vijaya,Park, Dong-Kyu,Amasia, Mary,Kim, Nahui,Kim, Jintae,Kim, Hanshin,Madou, Marc,Cho, Yoon-Kyoung Royal Society of Chemistry 2013 Lab on a chip Vol.13 No.18
<P>We present a novel fully integrated centrifugal microfluidic device with features for target antigen capture from biological samples, via a bead-based enzyme-linked immune-sorbent assay, and flow-enhanced electrochemical detection. The limit of detection (LOD) of our device for the C-reactive protein (CRP) was determined to be 4.9 pg mL(-1), a 17-fold improvement over quantification by optical density. The complete sample-to-answer protocol of our device is fully automated and takes less than 20 min. Overall, the presented microfluidic disc adds to the comparatively small number of fully integrated microfluidic-based platforms that utilize electrochemical detection and exemplifies how electrochemical detection can be enhanced by flow to successfully detect very low levels of biomarkers (e.g. pg mL(-1)).</P>