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Kim, Taesik,Woo, Sang Inn,Choi, Eunsoo,Jung, Young-Hoon Elsevier 2018 Computers and geotechnics Vol.94 No.-
<P><B>Abstract</B></P> <P>This paper introduces a new method for quantifying the morphological evolution of the strain response envelope (SRE). The Fourier series approximation was used to trace the morphological characteristics of SREs. Two SREs computed via numerical simulations using the Modified Cam Clay (MCC) model and three SREs obtained from stress-probing experiments on Chicago clay were used to validate the proposed method of Fourier series approximation. The results show that using a harmonic number of 1 or 2, the target shape of the SRE can be approximated within a 10% error.</P>
The Optimized Partial Insulator Isolation MOSFET (PiFET)
Kim, Young Kwon,Lee, Jin Sung,Kim, Geon,Park, Taesik,Kim, Hui Jung,Cho, Young Pyo,Park, Young June,Lee, Myoung Jin The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.5
The proposed partial insulator isolation MOSFET (PiFET) structure, shows the characteristics of improved DIBL and high threshold voltage, using the optimized buried partial insulator shape with a small dielectric constant, compared with the conventional planar MOSFET and silicon on insulator (SOI) structures, even though it has the same doping profile.
Diagnosis of split fractures of the mandible in adults
Taesik Kim,Sung Gyun Jung,In Pyo Hong,Young Joong Hwang Korean Cleft Palate-Craniofacial Association 2023 Archives of Craniofacial Surgery Vol.24 No.4
Background: Mandibular split fractures, in which the fracture occurs exclusively in the posterior wall, are uncommon. This study aimed to enhance clinicians' understanding of mandibular split fractures and offer insights for future research. Methods: This study included six patients who visited our hospital between January 2020 and June 2023 and were diagnosed with mandibular split fractures. We retrospectively collected data from patients' medical records on their age, sex, symptoms, mechanism, impact site, associated injuries, and treatment method, as well as the location, pattern, and number of fractures observed on computed tomography (CT) and panoramic images. The frequency of split fractures among all mandibular fractures was calculated. Results: The six patients included three men (50%) and three women (50%), ranging in age from 20 to 71 years (mean age, 49.8 years). The split fractures were located in the symphysis in one patient (16.7%), symphysis to parasymphysis in two patients (33.3%), parasymphysis in one patient (16.7%), and parasymphysis to the body in two patients (33.3%). Four patients (66.7%) had condylar head fractures, while two patients (33.3%) had single split fractures. The mechanism of trauma was a slip-down incident in four cases (66.7%), while two cases (33.3%) were caused by motorcycle traffic accidents. Four patients (67%) underwent intermaxillary fixation, while two patients (33%) improved with conservative treatment. Split fractures were diagnosed in all six patients on CT, whereas the fracture line was not clearly visible on panoramic images. Mandibular split fractures accounted for 5.6% of all mandibular fractures. Conclusion: This study provides insights into the clinical characteristics of rare mandibular split fractures and the diagnostic imaging findings. Furthermore, CT scans and three-dimensional image synthesis-instead of panoramic images-may be essential for accurately diagnosing mandibular fractures, including mandibular split fractures, in the future.
A Retrospective CT Analysis for Prelacrimal Window Access to Maxillary Sinus
Kim Hansol,Jung Taesik,Park Joon Yong,Lee Jiyeon,Cho Jae Hoon,Kim Jin Kook 대한비과학회 2022 Journal of rhinology Vol.29 No.1
Background and Objectives: The prelacrimal window approach (PLWA) is useful for treating anterior maxillary sinus lesions. A previous study reported that the feasibility of PLWA in Chinese patients was 93.0%, which is higher than that in the European population (68.5%). This study aimed to compare the ease of PLWA between a patient group and healthy controls and to analyze the results for Koreans compared to those of previous studies. Differences between the patient and control groups and the distribution of types in the Korean population were evaluated.Methods: We analyzed 89 paranasal computed tomography (CT) scans from 51 controls and 38 patients (178 sides). We measured the distance distribution between the anterior wall of the maxillary sinus and the anterior wall of the lacrimal duct (D1) and its thickness (T). We compared the values in the control and patient groups.Results: D1 and D2 were similar between the patient and control groups (p=0.395, p=0.344), though T was greater in the patient group (p<0.001). In the patient group, sinus with inverted papilloma (IP) and normal sinus were not significantly different for any of these measures. The D1 distribution in Koreans did not differ significantly from that of Chinese but did differ from that of Europeans.Conclusion: The ease of PLWA was 92.2% in Koreans, which is more similar to that of Chinese (93.0%) than to that of Europeans (68.5%). D1 and D2 of the patient group did not differ from those of the control group, but T was greater in the patient group. In the patient group, D1 and D2 were not significantly different between sinus with IP and normal sinus. The frequency of type 2+3 in patients was similar to that of the control group.
Underwater Walking Mechanism of Underwater Amphibious Robot Using Hinged Multi-modal Paddle
Taesik Kim,Young-woon Song,Seokyong Song,Son-Cheol Yu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.4
This study proposes an underwater walking mechanism for an underwater amphibious robot that is propelled by a degree of freedom flapping foil system. To implement stable walking in water, we proposed a distinctive hinged multi-modal paddle and developed an underwater amphibious robot. For the proposed paddle, forward walking model is proposed regarding both the ground contact and hydrodynamic forces in each walking phase: the stanceand swing phases. Then, we generalized dynamic equations of motion for the amphibious robot based on the forward walking model. The proposed mechanism and robot were evaluated through thrust and forward walking tests in an indoor water tank. The results of the forward walking test exhibited a highly accurate trajectory of leggedlocomotion compared to the model-based simulation results. Moreover, field tests on gravel and soft terrains of aseabed, revealed that the proposed system allowed the amphibious robot to walk qualitatively.
FN-tunneling-current Modeling in a Recessed-channel Structure
Kim, Young Kwon,Park, Taesik,Lee, Jin Sung,Kim, Geon,Kim, Hui Jung,Cho, Young Pyo,Park, Young June,Lee, Myoung Jin The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.5
The FN-tunneling gate-current model for the three-dimensional recessed-channel structure including a geometrical effect is obtained. Further, the measurement results in the fabricated 60-nm DRAM chip are well fitted using our modeled simulation results in consideration of the cylindrical coordinate and the poly-depletion effect. As the recessed structure was scaled down to sub-50-nm technology with a very thin oxide thickness and a small radius, for which the reliability issues were considered, the geometrical effect seriously affected the memory-sensing margin. Our model presents a sound solution for the attainment of a fast and accurate FN-tunneling gate current to resolve the reliability issues of memory-cell transistors.
Utterance Transition Approach for Speaker Recognition Using Artificial Neural Networks
Kim,Taesik 계명대학교 산업기술연구소 1993 産業技術硏究所 論文報告集 Vol.16 No.1
A new approach utilizing artificial neural network for speaker recognition is presented. Formulation of the segmental framework and new methods to extract transition of utterance are described. A set of internal parameters obtained from the segments can be chosen as the component of a feature vector of the utterance signal, then is used as input data for the multi-layer perceptron (MLP). The MLP is trained by 100 utterances which are collected from 10 speakers. The recognition rates are about 97%.