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Lee Keon-Joo,Shin Dong Woo,Park Hong-Kyun,Kim Beom Joon,박종무,Kang Kyusik,Park Tai Hwan,Lee Kyung Bok,Hong Keun-Sik,Cho Yong-Jin,Kim Dong-Eog,Ryu Wi-Sun,Lee Byung-Chul,Yu Kyung-Ho,오미선,Lee Soo Joo,Kim Ja 대한의학회 2022 Journal of Korean medical science Vol.37 No.33
This study aimed to present the prognosis after minor acute ischemic stroke (AIS) or transient ischemic attack (TIA), using a definition of subsequent stroke in accordance with recent clinical trials. In total, 9,506 patients with minor AIS (National Institutes of Health Stroke Scale ≤ 5) or high-risk TIA (acute lesions or ≥ 50% cerebral artery steno-occlusion) admitted between November 2010 and October 2013 were included. The primary outcome was the composite of stroke (progression of initial event or a subsequent event) and all-cause mortality. The cumulative incidence of stroke or death was 11.2% at 1 month, 13.3% at 3 months and 16.7% at 1 year. Incidence rate of stroke or death in the first month was 12.5 per 100 person-months: highest in patients with large artery atherosclerosis (17.0). The risk of subsequent events shortly after a minor AIS or high-risk TIA was substantial, particularly in patients with large artery atherosclerosis.
Jay Chol Choi,Ji Sung Lee,Tai Hwan Park,Yong-Jin Cho,Jong-Moo Park,Kyusik Kang,Kyung Bok Lee,Soo Joo Lee,Jae Guk Kim,Jun Lee,Man-Seok Park,최강호,Joon-Tae Kim,유경호,Byung-Chul Lee,Mi-Sun Oh,Jae-Kwan Cha,Da 대한뇌졸중학회 2016 Journal of stroke Vol.18 No.3
Background and Purpose About 30%-40% of stroke patients are taking antiplatelet at the time of their strokes, which might increase the risk of symptomatic intracranial hemorrhage (SICH) with intravenous tissue plasminogen activator (IV-TPA) therapy. We aimed to assess the effect of prestroke antiplatelet on the SICH risk and functional outcome in Koreans treated with IV-TPA. Methods From a prospective stroke registry, we identified patients treated with IV-TPA between October 2009 and November 2014. Prestroke antiplatelet use was defined as taking antiplatelet within 7 days before the stroke onset. The primary outcome was SICH. Secondary outcomes were discharge modified Rankin Scale (mRS) score and in-hospital mortality. Results Of 1,715 patients treated with IV-TPA, 441 (25.7%) were on prestroke antiplatelet. Prestroke antiplatelet users versus non-users were more likely to be older, to have multiple vascular risk factors. Prestroke antiplatelet use was associated with an increased risk of SICH (5.9% vs. 3.0%; adjusted odds ratio [OR] 1.79 [1.05-3.04]). However, at discharge, the two groups did not differ in mRS distribution (adjusted OR 0.90 [0.72-1.14]), mRS 0-1 outcome (34.2% vs. 33.7%; adjusted OR 1.27 [0.94-1.72), mRS 0-2 outcome (52.4% vs. 52.9%; adjusted OR 1.21 [0.90-1.63]), and in-hospital mortality (6.1% vs. 4.2%; adjusted OR 1.19 [0.71-2.01]). Conclusions Despite an increased risk of SICH, prestroke antiplatelet users compared to non-users had comparable functional outcomes and in-hospital mortality with IV-TPA therapy. Our results support the use of IV-TPA in eligible patients taking antiplatelet therapy before their stroke onset.
New Rail-to-Rail Column Driver for 8-bit Large TFT LCD Applications
Kyusik Lee,Jongbae Son,Wooram Lee,Sooyang Park,Sanghee Son,Wonsup Chung 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, a high-speed low-power column driver using a new rail-to-rail scheme is proposed, designed and evaluated for large TFT LCD applications. The proposed output driver is composed of a differential amplifier stage, second amplifier stage, driver selector, dual push-pull output driver stage for rail-to-rail output driving and feedback path selector. The output driver amplifier achieves a very large driving capability by eliminating the RON of the output switches used for polarity control. This increases the output driving speed while retaining low quiescent current consumption and can minimize the area of the output driving transistors and switches used for output polarity inversion. The quiescent current consumptions for the PMOS input driver and NMOS input driver are 10uA/channel on average.
Lee, Eunmi,Kim, Kyusik,Choi, Moonjae,Lee, Youngmoo,Park, Jin-Won,Kim, Bumsang Informa Healthcare 2010 Drug delivery Vol.17 No.8
<P>pH-Responsive P(MAA-co-EGMA) hydrogel microparticles were prepared and their feasibility as intelligent delivery carriers was evaluated. P(MAA-co-EGMA) hydrogel microparticles were synthesized via dispersion photopolymerization. There was a drastic change in the swelling ratio of P(MAA-co-EGMA) microparticles at a pH of ~ 5 and, as the amount of MAA in the hydrogel increased, the swelling ratio increased at a pH above 5. The loading efficiency of the ascorbic acid into the hydrogel was affected more by the degree of swelling of the hydrogel than the electrostatic interaction between the hydrogel and the loaded ascorbic acid. The P(MAA-co-EGMA) hydrogel microparticles showed a pH-sensitive release behavior. Thus, at pH 4 almost none of the ascorbic acid permeated through the skin while at pH 6 relatively high skin permeability was obtained. The ascorbic acid loaded in the hydrogel particles was hardly degraded and its stability was maintained at high temperature.</P>
Predictive Value of Pulse Pressure in Acute Ischemic Stroke for Future Major Vascular Events
Lee, Keon-Joo,Kim, Beom Joon,Han, Moon-Ku,Kim, Joon-Tae,Cho, Ki-Hyun,Shin, Dong-Ick,Yeo, Min-Ju,Cha, Jae-Kwan,Kim, Dae-Hyun,Nah, Hyun-Wook,Kim, Dong-Eog,Ryu, Wi-Sun,Park, Jong-Moo,Kang, Kyusik,Lee, So Ovid Technologies Wolters Kluwer -American Heart A 2018 Stroke Vol.49 No.1
<P>Conclusions-Our study shows that PP when measured in the acute period of ischemic stroke has nonlinear J-shaped relationships with major vascular events and stroke recurrence, and may have a stronger predictive power than other commonly used BP parameters.</P>
Lee, Jiho,Lee, Jaehan,Ahn, Jaewuk,Jo, Kyusik,Hong, Sung Pil,Kim, Choonsoo,Lee, Changha,Yoon, Jeyong American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.40
<P>Desalination technologies have heavily been investigated to utilize the abundant salt water on Earth due to the global freshwater shortage. During recent years, the desalination battery (DB) has attracted attention for its low-cost, eco-friendly, and energy-efficient characteristics. However, the current DB system is subject to inevitable performance degradation because of the mass-transfer limitation at the electrode-electrolyte interface, particularly when the system is used to treat brackish water. Here, we present a novel strategy to overcome the intrinsic mass-transfer limitation of DB in brackish water using an effective cell design based on a multichannel flow system. Compared to the conventional DB that consists of one feed channel, the multichannel desalination battery (MC-DB) is configured using two side channels introducing a highly concentrated solution to the electrodes and one middle feed channel for water desalination. The MC-DB showed a desalination capacity of 52.9 mg g<SUP>-1</SUP> and a maximum salt removal rate of 0.0576 mg g<SUP>-1</SUP> s<SUP>-1</SUP> (production rate of 42.3 g m<SUP>-2</SUP> h<SUP>-1</SUP>) when a salinity gradient between the feed streams in the middle (10 mM NaCl) and side (1000 mM NaCl) channels was present, which were 3-fold higher than those in the case with no salinity gradient. In addition, the high concentration solution in the side channel significantly enhanced the rate capability of MC-DB, allowing the system to operate under a high current density of 40 A m<SUP>-2</SUP> with a desalination capacity of 34.1 mg g<SUP>-1</SUP>. Considering the effect of electrolyte concentration on the battery electrode performance through electrochemical characterization, the highly saline medium at the side channel in the MC-DB creates an optimal environment for the battery electrode to fully capitalize the high desalination capacity, salt removal rate, and capacity retention of the battery electrodes.</P> [FIG OMISSION]</BR>
이규식(Kyusik Lee) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.2
Purpose: In recent years, weight reduction for improving fuel efficiency of the vehicle and cost reduction have been developed. The structure of suspension link is widely used as a single plate press structure which can reduce process and weight compared to existing pipe welding method. However, it was found that the lifetime of a single plate press structure is determined by initial defects that occurred during initial manufacturing rather than fatigue damage caused by driving. Methods: I research the mechanism of failure phenomenon of the single plate press assist arm of rear wheel. In addition, I investigate durability effect parameters to determine the link lifetime in inserting bush into single plate press process through durability test. Conclusion: I discover significant durability effect parameter in inserting bush into single plate press process. It is expected that the durability can be improved by suggesting a bush inserting process inspection guide for similar suspension link like single plate press structure.