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Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19
<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>
산업단지 및 일반생활 지역의 공기 중 톨루엔에 대한 개인노출 및 생체시료의 상관성 분석
이병준(Byoungjun Lee),허 정(Jung Heo),정다영(Dayoung Jung),김순신(Sunshin Kim),류현수(Hyeon-Su Ryu),최민지(Min-Ji Choi),솨이지엔페이(Jian-Fei Shuai),임성국(Sung-Guk Im),양원호(Wonho Yang) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.4
Objectives: The purpose of this study was to assess the correlation relationship between personal exposure and urinary hippuric acid in biological monitoring for airborne toluene in an industrial complex and in general environments. Methods: Personal exposure to toluene and its metabolite, hippuric acid, in urine were simultaneously measured in occupational environments area near an industrial complex and in general environments. The study subjects were divided into three types: 137 workers who use organic solvents in the workplace, 210 residents living near a dyeing industrial complex, and 379 residents living in general environments. The toluene exposures of workers and residents were measured by a passive sampler for four days. The urine of participants was sampled when the passive samplers of personal exposure were collected. Results: The toluene and hippuric acid concentrations of workers were the highest, followed by the concentrations of residents living near a dyeing industrial complex and residents living in general environments. The coefficient of correlation between the concentrations of toluene and hippuric acid among workers was 0.749 (p<0.01) in the workplace. On the contrary, correlations between the concentrations of toluene and hippuric acid among residents living near a dyeing industrial complex and residents living in general environments were all not significant. The relationship between the concentrations of hippuric acid and toluene in three types could be described by the exponential growth model. Conclusions: This study analyzed the relationships between toluene exposure and the concentrations of hippuric acid in urine in high, middle, and low exposure environments, and could be described by the exponential growth model.
( Sang Eun Lee ),( Yi Ok Kim ),( Woo Yong Choi ),( Do Hyung Kang ),( Hyeon Yong Lee ),( Kyung Hwan Jung ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.10
We established a two-step production process using immobilized S. cerevisiae and P. stipitis yeast to produce ethanol from seaweed (U. pertusa Kjellman) hydrolysate. The process was designed to completely consume both glucose and xylose. In particular, the yeasts were immobilized using DEAE-corncob and DEAE-cotton, respectively. The first step of the process included a continuous column reactor using immobilized S. cerevisiae, and the second step included a repeated-batch reactor using immobilized P. stipitis. It was verified that the glucose and xylose in 20 L of medium containing the U. pertusa Kjellman hydrolysate was converted completely to about 5.0 g/l ethanol through the two-step process, in which the overall ethanol yield from total reducing sugar was 0.37 and the volumetric ethanol productivity was 0.126 g/ l/h. The volumetric ethanol productivity of the two-step process was about 2.7 times greater than that when P. stipitis was used alone for ethanol production from U. pertusa Kjellman hydrolysate. In addition, the overall ethanol yield from glucose and xylose was superior to that when P. stipitis was used alone for ethanol production. This two-step process will not only contribute to the development of an integrated process for ethanol production from glucoseand xylose-containing biomass hydrolysates, but could also be used as an alternative method for ethanol production.
An IMM-Based Method for Reentry-Phase Tracking of Unknown Ballistic Missiles
Sang-Hyeon Kim,Han-Lim Choi 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper, the tracking system which is related to the ballistic missile defense (BMD) is considered. In BMD system, it is necessary to track the fast and unknown objects. Furthermore, priori information about the hostile missile is not provided. Without the priori information like aerodynamic parameters, it is hard to make the filter dynamic model of the hostile missile. To solve this problem, in many researches, IMM filter is selected as a tracking filter of BMD system. But IMM filter itself is not a perfect tool for tracking the unknown target. If the IMM filter mode set does not subsume the true dynamic model, the tracking filter may have large error. So, the mode revision method is suggested. With this method, the IMM mode set is adaptively changed and then subsumes the true dynamic model.
Choi Miyoung,Lee Hyeon-Jeong,Yu Su-Yeon,Kim Jimin,Park Jungeun,Ryoo Seungeun,Kim Inho,Park Dong Ah,Yoon Young Kyung,Joh Joon-Sung,Park Sunghoon,Yun Ki Wook,Choi Chi-Hoon,Kim Jae-Seok,Shin Sue,Kim Hyun 대한의학회 2023 Journal of Korean medical science Vol.38 No.23
Background: In Korea, during the early phase of the coronavirus disease 2019 (COVID-19) pandemic, we responded to the uncertainty of treatments under various conditions, consistently playing catch up with the speed of evidence updates. Therefore, there was high demand for national-level evidence-based clinical practice guidelines for clinicians in a timely manner. We developed evidence-based and updated living recommendations for clinicians through a transparent development process and multidisciplinary expert collaboration. Methods: The National Evidence-based Healthcare Collaborating Agency (NECA) and the Korean Academy of Medical Sciences (KAMS) collaborated to develop trustworthy Korean living guidelines. The NECA-supported methodological sections and 8 professional medical societies of the KAMS worked with clinical experts, and 31 clinicians were involved annually. We developed a total of 35 clinical questions, including medications, respiratory/critical care, pediatric care, emergency care, diagnostic tests, and radiological examinations. Results: An evidence-based search for treatments began in March 2021 and monthly updates were performed. It was expanded to other areas, and the search interval was organized by a steering committee owing to priority changes. Evidence synthesis and recommendation review was performed by researchers, and living recommendations were updated within 3–4 months. Conclusion: We provided timely recommendations on living schemes and disseminated them to the public, policymakers and various stakeholders using webpages and social media. Although the output was successful, there were some limitations. The rigor of development issues, urgent timelines for public dissemination, education for new developers, and spread of several new COVID-19 variants have worked as barriers. Therefore, we must prepare systematic processes and funding for future pandemics.
Sang Un Park,Deok-Jong Ahn,Hyeon-Jeong Jeon,Tae Ryong Kwon,Hyoun-Sub Lim,Bo-Seong Choi,Kwang-Hyun Baek,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.2
An light-emitting diode (LED)-based light source was used as a monochromatic light source to determine the responses of raw ginseng roots (Panax ginseng Meyer) to specifi c emission spectra with respect to the production of ginsenosides. The ginsenoside content in the ginseng roots changed in response to the LED light treatments at 25℃ relative to the levels in the control roots that were treated in the dark or at 4℃ for 7 d. Ginseng roots were exposed to LEDs with four different peak emission wavelengths, 380, 450, 470, and 660 ㎚, in closed compartments. Compared with the control 4℃-treated roots, roots that were treated with 450 and 470 ㎚ light showed a signifi cantly increased production of ginsenosides (p<0.05), with increases of 64.9% and 74.1%, respectively. The contents of the ginsenosides Rb2, Rc, and Rg₁ were signifi cantly higher (p<0.05) in the 450 and 470 ㎚-treated root samples. The ratio of protopanaxadiol ginsenosides (Rb₁, Rb₂, Rc, and Rd) to protopanaxatriol ginsenosides (Rg₁, Rg₂, Re, and Rf) was signifi cantly higher (p<0.05) in the 450 and 470 ㎚-treated root samples than in the control 4℃-treated roots. This is the fi rst report that demonstrates the increase and conversion of ginsenosides in raw ginseng roots in response to exposure to LED light.
Choi Hyeon Gyeom,Park So Yeon,Bae Sung Hun,Chang Sun-Young,Kim So Hee 한국응용약물학회 2024 Biomolecules & Therapeutics(구 응용약물학회지) Vol.32 No.5
Tofacitinib, a Janus kinase (JAK) inhibitor used to treat rheumatoid arthritis, is metabolized through hepatic cytochrome P450 (CYP), specifically CYP3A1/2 and CYP2C11. Prolonged administration of rheumatoid arthritis medications is generally associated with an increased risk of renal toxicity. Loganin (LGN), an iridoid glycoside, has hepatorenal regenerative properties. This study investigates the potential of LGN to mitigate acute kidney injury (AKI) and its effects on the pharmacokinetics of tofacitinib in rats with cisplatin-induced AKI. Both intravenous and oral administration of tofacitinib to AKI rats significantly increased the area under the plasma concentration-time curve from time 0 to infinity (AUC) compared with control (CON) rats, an increase attributed to the decelerated non-renal clearance (CLNR) and renal clearance (CLR) of tofacitinib. Administration of LGN to AKI rats, however, protected kidneys from severe impairment, restoring the pharmacokinetic parameters (AUC, CLNR, and CLR) of tofacitinib to those observed in untreated CON rats, with partial recovery of kidney function, as evidenced by an increase in creatinine clearance. Possible interactions between drugs and natural components should be considered, especially when co-administering both a drug and a natural extract containing LGN or iridoid glycosides to patients with kidney injury.
The production of LiCoO2 cathode thick films for an all-solid-state microbattery
Sung-Man Lee,Seung-Tae Lee,Hyeon-Ju Kim,Seung-Don Choi 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.2
Crack-free LiCoO2 films with a thickness more than 10 μm have been prepared by a sol-gel derived screen-printing process, using two different-sized LiCoO2 powders (mean particle sizes: 6 μm and 0.8 μm). The slurry as a coating medium consists of LiCoO2 powders and a LiCoO2 sol-gel precursor solution, which gives a well-dispersed slurry with high powder content. The slurry is screen-printed onto a Pt-coated alumina and annealed at relatively low temperatures as in a conventional solgel process. The feasibility of applying the fabricated films as cathodes for lithium rechargeable batteries is demonstrated. No obvious cracking after cycling was observed. Excellent cyclability was obtained. The films prepared using fine grain powders are less porous than those made from large grain powders, which lead to a better Coulombic efficiency for electrodes using the former. It is suggested that the novel process is promising for fabricating LiCoO2 thick films for potential applications in all-solid-state rechargeable lithium batteries. Crack-free LiCoO2 films with a thickness more than 10 μm have been prepared by a sol-gel derived screen-printing process, using two different-sized LiCoO2 powders (mean particle sizes: 6 μm and 0.8 μm). The slurry as a coating medium consists of LiCoO2 powders and a LiCoO2 sol-gel precursor solution, which gives a well-dispersed slurry with high powder content. The slurry is screen-printed onto a Pt-coated alumina and annealed at relatively low temperatures as in a conventional solgel process. The feasibility of applying the fabricated films as cathodes for lithium rechargeable batteries is demonstrated. No obvious cracking after cycling was observed. Excellent cyclability was obtained. The films prepared using fine grain powders are less porous than those made from large grain powders, which lead to a better Coulombic efficiency for electrodes using the former. It is suggested that the novel process is promising for fabricating LiCoO2 thick films for potential applications in all-solid-state rechargeable lithium batteries.
( Sung Chul Choi ),( Beom Jin Kim ),( Poong Lyul Rhee ),( Dong Kyung Chang ),( Hee Jung Son ),( Jae J. Kim ),( Jong Chul Rhee ),( Soon Im Kim ),( Young Sil Han ),( Ki Hyeon Sim ),( Seok Nam Park ) 대한소화기기능성질환·운동학회 2011 Gut and Liver Vol.5 No.1
Background/Aims: Although controversial, probiotics and dietary fiber are commonly used for patients with irritable bowel syndrome (IBS). We evaluated the effects of multistrain probiotics on the symptoms of IBS to determine whether the addition of dietary fi ber had an additive effect on constipation-predominant IBS. Methods: A total of 142 participants who met the Rome III criteria were recruited and randomized into a control group or a test group. Participants in the control group received multistrain probiotic fermented milk with Streptococcus thermophilus, Lactobacillus acidophilus and Bifi dobacterium infantis; the participants in the test group received the same probiotic fermented milk mixed with dietary fi ber such as sea tangle extracts, radish extracts and glasswort extracts. The patients were treated for four weeks. Results: Most of the symptoms of IBS, with the exception of fl atulence, stool consistency, and frequency of defecation, signifi cantly improved in both groups. In the analysis of IBS subtypes, especially constipation-predominant IBS, the frequency and duration of defecation and straining at stool were improved more in the test group than in the control group. Conclusions: Dietary fiber had additive benefits for the symptoms of constipation, especially in constipationpredominant IBS. (Gut Liver 2011;5:22-28)