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Choi, Taesoo,Yoo, Koo Han,Choi, Seung-Kwon,Kim, Dong Soo,Lee, Dong-Gi,Min, Gyeong Eun,Jeon, Seung Hyun,Lee, Hyung-Lae,Jeong, In-Kyung The Korean Urological Association 2015 Korean Journal of Urology Vol.56 No.6
<P><B>Purpose</B></P><P>The aim of our study was to evaluate the association of several factors with spontaneous stone expulsion, including ureteral stone characteristics (size, location, hydronephrosis, perinephric stranding), types of medications prescribed (α-blocker, low-dose steroid), and other possible demographic and health-history factors (gender, age, serum creatinine, underlying diabetes mellitus [DM], and hypertension).</P><P><B>Materials and Methods</B></P><P>A total of 366 patients with ureteral stones were enrolled. All patients underwent watchful waiting without any invasive procedures. Initial diagnoses of ureteral stones were confirmed by computed tomography scans, which were taken at approximately 1-month intervals to check for stone expulsion. Univariate and multivariate analyses were conducted to identify significant factors that contributed to stone expulsion.</P><P><B>Results</B></P><P>Among 366 patients, 335 patients (91.5%) experienced spontaneous stone passage during a mean follow-up period of 2.95±2.62 weeks. The patients were divided into two groups depending on the success of spontaneous stone passage. Univariate analyses revealed that stone location (p=0.003), stone size (p=0.021), and underlying DM (p<0.001) were significant predictors of stone passage. Multivariate analyses confirmed that stone size (p=0.010), stone location (p=0.008), and underlying DM (p=0.003) were independent predictive factors affecting stone passage.</P><P><B>Conclusions</B></P><P>Stone size, location, and underlying DM were confirmed to be significant predictive factors for spontaneous passage of ureteral stones. Urologists should consider active procedures, such as shock wave lithotripsy or ureteroscopy, rather than conservative management in patients presenting with proximally located stones, large ureteral stones, or underlying DM.</P>
Jeonghyouk Choi,Taesoo Choi,이동기,민경은,이형래,유구한 대한요로생식기감염학회 2019 Urogenital Tract Infection Vol.14 No.3
Purpose: This study compared the clinical benefits of double J (DJ) ureteral stenting with percutaneous nephrostomy (PCN) for the management of acute pyelone-phritis (APN) with complicated ureteral stones.Materials and Methods: The records of 85 patients with complicated APN between December 2006 and July 2017 were reviewed retrospectively. Sixty one patients who underwent DJ or PCN for the management of acute urinary obstruction were enrolled in this study. Some of the participants were excluded for concurrent renal stones, multiple ureteral stones, ureteral stricture, malignancy, and anatomical anomalies. The patient and stone characteristics and peri-procedural laboratory test results of the groups were compared. The success rate, depending on the type of urinary diversion and the presence of immediate complications, were also anal-yzed.Results: In this study, 19 patients underwent DJ stenting, and 42 patients underwent PCN as a transient urinary diversion. No failed procedures or immediate com-plications requiring subsequent intervention were encountered (Clavien–Dindo grade II-V). Urologists preferred PCN to DJ stenting in cases with an elevated serum creatinine level (p=0.001) and higher C-reactive protein (CRP) level (p<0.001). The indicative parameters for renal injury and septic conditions (white blood cell count, segment neutrophil, and creatinine levels) tended to show immediate improvement, whereas CRP did not; however, the differences in markers were not significant (p=0.701, 0.962, 0.288, and 0.360, respectively).Conclusions: Both DJ stenting and PCN were safe and feasible methods for the management of complicated APN. With experienced urologists or radiologists, there may be little danger of prolonged renal failure or other procedure-related complications.
Choi, Sinho,Bok, Taesoo,Ryu, Jaegeon,Lee, Jung-In,Cho, Jaephil,Park, Soojin Elsevier 2015 Nano energy Vol.12 No.-
<P><B>Abstract</B></P> <P>We revisit the metallothermic reduction process to synthesize shape-preserving macro-/nanoporous Si particles via aluminothermic and subsequent magnesiotheric reaction of porous silica particles. This process enables us to control the specific capacity and volume expansion of shape-preserving porous Si-based anodes. Two step metallothermic reactions have several advantages including a successful synthesis of shape-preserving Si particles, tunable specific capacity of as-synthesized Si anode, accommodation of a large volume change of Si by porous nature and alumina layers, and a scalable synthesis (hundreds of gram per batch). An optimized macroporous Si/Al<SUB>2</SUB>O<SUB>3</SUB> composite anode exhibits a reversible capacity of ~1500mAhg<SUP>−1</SUP> after 100 cycles at C/5 and a volume expansion of ~34% even after 100 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We revisited the metallothermic reduction to synthesize shape-preserving macro/nanoporous Si particles. </LI> <LI> Two-step reduction reaction enabled us to control the specific capacity and volume expansion of porous Si-based anodes. </LI> <LI> Macro/nanoporous Si anode showed a reversible capacity of 1500mAhg<SUP>−1</SUP> after 100 cycles and a volume expansion of 34% even after 100 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Shape-reserving macroporous Si/Al<SUB>2</SUB>O<SUB>3</SUB> composite can be synthesized by two-step metallothermic reaction. This process enables us to control a reversible capacity of a volume expansion of Si-base anode materials for practical lithium-ion battery applications. Optimized Si-based composite electrodes show a reversible capacity of 1500mAhg<SUP>−1</SUP> at C/5 with minimized volume expansion (<35%) after 100 cycles.</P> <P>[DISPLAY OMISSION]</P>
Spatial Performance Analysis and Design Principles for Wireless Peer Discovery
Taesoo Kwon,Ji-Woong Choi IEEE 2014 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.13 No.8
<P>In wireless peer-to-peer networks that serve various proximity-based applications, peer discovery is the key to identifying other peers with which a peer can communicate and an understanding of its performance is fundamental to the design of an efficient discovery operation. This paper analyzes the performance of wireless peer discovery through comprehensively considering the wireless channel, spatial distribution of peers, and discovery operation parameters. The average numbers of successfully discovered peers are expressed in closed forms for two widely used channel models, i.e, the interference limited Nakagami-m fading model and the Rayleigh fading model with nonzero noise, when peers are spatially distributed according to a homogeneous Poisson point process. These insightful expressions lead to the design principles for the key operation parameters including the transmission probability, required amount of wireless resources, level of modulation and coding scheme (MCS), and transmit power. Furthermore, the impact of shadowing on the spatial performance and suggested design principles is evaluated using mathematical analysis and simulations.</P>
Optimal White Point of Television Under Varying Illuminants
Taesoo Kim,Kyungah Choi,Yeonhui Ji,Hyeon-Jeong Suk 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
This study investigates the optimal white point of QLED TV under varying illuminants, and the effect of the color temperature and the illuminance of ambient lighting on user preferences were observed. For a visual examination, a total of 8 nuanced whites were examined under 13 illuminants. A total of 8 display stimuli with different correlated color temperatures (4,000 K ~ 15,000 K) were presented on a QLED TV. The ambient illuminants ranged in correlated color temperature from 3,500 K to 8,000 K and from 0 lx to 1,000 lx in illuminance. Based on assessments by 104 subjects, an optimal color temperature of QLED TV is around 6,000 K to 7,000 K. However, the optimal display color temperatures lower than the default white point of Asian broadcasts. It is expected that the findings of this study can be used as the theoretical basis when designing a color strategy for TV display manufacturing or Asian broadcast white point.
Multi-Group Random Access Resource Allocation for M2M Devices in Multicell Systems
Taesoo Kwon,Ji-Woong Choi IEEE 2012 IEEE communications letters Vol.16 No.6
<P>The efficient service of a tremendous number of machine-type devices with heterogeneous traffic types may consider simple random access as a solution. For more rigorous analysis of system performance in multicell environments, it is required to consider not only the packet collisions within the same cell but also the interference from other cells. This letter analyzes signal-to-interference-ratio distributions and derives efficient resource allocation schemes for spatial multi-group random access in multicell systems, using the Poisson point process model.</P>