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Kim, Agnus M.,Park, Jong Heon,Kang, Sungchan,Hwang, Kyosang,Lee, Taesik,Kim, Yoon The Korean Society for Preventive Medicine 2016 예방의학회지 Vol.49 No.4
Objectives: We aimed to evaluate the effect of geographic units of analysis on measuring geographic variation in medical services utilization. For this purpose, we compared geographic variations in the rates of eight major procedures in administrative units (districts) and new areal units organized based on the actual health care use of the population in Korea. Methods: To compare geographic variation in geographic units of analysis, we calculated the age-sex standardized rates of eight major procedures (coronary artery bypass graft surgery, percutaneous transluminal coronary angioplasty, surgery after hip fracture, knee-replacement surgery, caesarean section, hysterectomy, computed tomography scan, and magnetic resonance imaging scan) from the National Health Insurance database in Korea for the 2013 period. Using the coefficient of variation, the extremal quotient, and the systematic component of variation, we measured geographic variation for these eight procedures in districts and new areal units. Results: Compared with districts, new areal units showed a reduction in geographic variation. Extremal quotients and inter-decile ratios for the eight procedures were lower in new areal units. While the coefficient of variation was lower for most procedures in new areal units, the pattern of change of the systematic component of variation between districts and new areal units differed among procedures. Conclusions: Geographic variation in medical service utilization could vary according to the geographic unit of analysis. To determine how geographic characteristics such as population size and number of geographic units affect geographic variation, further studies are needed.
Vehicular datacenter modeling for cloud computing: Considering capacity and leave rate of vehicles
Kim, Taesik,Min, Hong,Jung, Jinman North-Holland 2018 Future generations computer systems Vol.88 No.-
<P><B>Abstract</B></P> <P>In this paper, we propose a vehicular datacenter model in a parking lot, where vehicles can be considered as a resource for cloud computing. One of the crucial issues facing the vehicular datacenter is failures caused by arrival and departure of dynamic resources. These failures result in performance degradation of the execution time because the task must be restarted. In order to reduce execution time and mitigate the effects of uncertainty, we propose a vehicular datacenter model that makes use of a checkpoint mechanism. We first characterize the dynamic vehicles in parking lots considering each vehicle’s capacity and leave rate. We derive the expected execution time to analyze the characteristics of vehicles and propose a resource selection strategy based on that time. We also derive the optimal number of checkpoints for each vehicle that maximizes the efficiency of the checkpoint. We demonstrate the results of our analysis through various evaluations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We propose a vehicular datacenter model that makes use of a checkpoint mechanism. </LI> <LI> We characterize the vehicles in parking lots considering its capacity and leave rate. </LI> <LI> We propose a resource selection strategy based on the expected execution time. </LI> <LI> We optimize the number of checkpoints that maximizes the efficiency of the checkpoint. </LI> </UL> </P>
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>
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.
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.
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.