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Choi, Jaewon,Yang, MinHo,Kim, Sung-Kon Elsevier BV * North-Holland 2017 Applied Surface Science Vol.422 No.-
<P><B>Abstract</B></P> <P>Bio-inspired and environmentally friendly chemical functionalization is a successful way to a new class of hybrid electrode materials for applications in energy storage. Quinone (Q)-hydroquinone (QH<SUB>2</SUB>) couples, a prototypical example of organic redox systems, provide fast and reversible proton-coupled electron-transfer reactions which lead to increased capacity. To achieve high capacitance and rate performance, constructing three-dimensional (3D) continuous porous structure is highly desirable. Here we report the hybrid electrodes (GA-C) consisting of 3D graphene aerogel (GA) functionalized with organic redox-active material, catechol derivative, for application to high-performance supercapacitors. The catechol derivative is adsorbed on the surface of GA through non-covalent interactions and promotes fast and reversible Q/QH<SUB>2</SUB> faradaic reactions, providing large specific capacitance of 188Fg<SUP>−1</SUP> at a current of 1Ag<SUP>−1</SUP> and a specific energy of ∼25 Wh kg<SUP>−1</SUP> at a specific power of ∼18,000Wkg<SUP>−1</SUP>. 3D continuous porous structure of GA electrode facilitates ion and electron transports, resulting in high rate performance (∼140Fg<SUP>−1</SUP> at a current of 10Ag<SUP>−1</SUP>).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Organic pseudocapacitive hybrid electrodes are prepared by using catechol derivative templated from graphene aerogel. </LI> <LI> The incorporated catechol derivative induces highly reversible faradaic reaction during charge/discharge. </LI> <LI> The pseudocapacitive behavior of catechol derivative is important to improve the specific capacitance of graphene aerogel. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
The Impact of Multi‐dimensional Trust for Customer Satisfaction
Jaewon Choi,Changsoo Sohn,Hong Joo Lee 한국경영과학회 2010 Management Science and Financial Engineering Vol.16 No.2
Trust is one of the most important aspects of the relationship between retailers and consumers in ecommerce. Users may have concerns about transaction security or personal information leakage when they engage in transactions over the Internet. It can be difficult to attract customers if the retailers or service providers cannot establish trust with their customers. There have been many studies of trust?building mechanisms between customers and e?storefronts. However, little work has been done on identifying the relationships between customer satisfaction, purchase intention, and trust. In addition, trust building occurs in the pre? and post?purchase phases of an e?commerce transaction, as well as gradually over repeated transactions. Thus we distinguish between cue?based trust and experience?based trust. The objective of this study was to explain the impact of trust on customer satisfaction and purchase intention in relation to e?commerce sites from the perspective of a multi?dimensional concept of trust. We surveyed 350 undergraduate students and obtained 331 responses for analysis. The result of our analysis showed that cue?based trust has a positive relationship with trust based on experience. Although the two concepts of trust have positive relationships with satisfaction, the path coefficient of trust based on experience was higher than that of cue?based trust. In addition, the purchase intention mediates the relationship between cue?based trust and experience?based trust.
Choi, Jaewon,Hwang, Yu Kyeong,Choi, Young Jin,Yoo, Ki Eun,Kim, Jeong Han,Nam, Seok Jin,Yang, Jung Hyun,Lee, Sang Jin,Yoo, Keon Hee,Sung, Ki Woong,Koo, Hong Hoe,Im, Young-Hyuck The Korean Academy of Medical Sciences 2007 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.22//SUP No.-
<P>Neuronal apoptosis inhibitory protein (NAIP) is a recently identified inhibitor of apoptosis protein. However, the clinical relevance of NAIP expression is not completely understood. In an attempt to determine the clinical relevance of NAIP expression in breast cancer, the levels of NAIP and survivin expression were measured in 117 breast cancer samples and 10 normal breast tissues using quantitative reverse-transcriptase-polymerase chain reaction. While there was no evidence of NAIP expression in the normal breast tissue, NAIP was expressed in all breast cancer samples. The level of NAIP expression in breast cancer was significantly higher (257 times) than in the universal tumor control. There was a strong correlation between the level of NAIP expression and the level of survivin expression (<I>p</I>=0.001). The level of NAIP expression in patients with a large tumor (≥T2) and patients with an unfavorable histology (nuclear grade III) was significantly higher than in those patients with a small tumor (T1) and patients with a favorable histology (nuclear grade I, II) (<I>p</I>=0.026 and <I>p</I>=0.050, respectively). Although the level of NAIP expression was higher in patients with other unfavorable prognostic factors, it was not significant. The three-year relapse-free survival rate was not significantly the patients showing high NAIP expression and patients showing low NAIP expression (86.47±4.79% vs. 78.74±6.57%). Further studies should include the expressions of NAIP in a larger number of patients and for a longer period of follow-up to evaluate correlation with metastasis and treatment outcome. In conclusion, NAIP is overexpressed in breast cancer patients with unfavorable clinical features such as stage and tumor size, suggesting that NAIP would play a role in the disease manifestation.</P>
Choi, Jaewon,Hwang, Yu Kyeong,Sung, Ki Woong,Lee, Soo Hyun,Yoo, Keon Hee,Jung, Hye Lim,Koo, Hong Hoe,Kim, Hee-Jin,Kang, Hyong Jin,Shin, Hee Young,Ahn, Hyo Seop American Society of Hematology 2007 Blood Vol.109 No.2
<B>Abstract</B><P>Livin, a member of the inhibitor of apoptosis proteins, has been considered to be a poor prognostic marker in malignancies. However, little is known about the clinical relevance of Livin expression in childhood acute lymphoblastic leukemia (ALL). In this study, the expression of Livin was analyzed in 222 patients with childhood ALL using quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) to investigate a possible association with the clinical features at diagnosis and treatment outcomes. Both Livin expression rates and expression levels were higher in patients with favorable prognostic factors. The expression rate was also higher in patients with a favorable day 7 bone marrow response to induction chemotherapy (P < .001). The Livin expression was related to the absence of relapse (P < .001). Similarly, the relapse-free survival rate (± 95% CI) was higher in patients with Livin expression than in patients without Livin expression (97.9% ± 4.0% versus 64.9% ± 11.8%, P < .001). Multivariate analysis for relapse-free survival demonstrated that Livin expression was an independent favorable prognostic factor in childhood ALL (P = .049). This study suggests that Livin expression is a novel prognostic marker in childhood ALL and thus needs to be incorporated into the patient stratification and treatment protocols.</P>
Functional Protein-Based Hydrogels: Understanding of Structure-Process-Property Relationships
Jaewon Choi(최재원) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Silk is one of the oldest natural biopolymers, used in the textile and biomedical worlds, yet more recently recognizing as an attractive material for emerging fields, such as flexible and wearable electronics, energy conversion and storage devices, environmentally adaptive materials, filtration, photonics, and sensing systems. These newer utilities derive from: (1) the ability of silk to be formed into unique nanoarchitectures through hierarchical self-assembly for processing into various material formats, with high fidelity feature resolution down to the nanoscale, and (2) the availability of silk as an abundant natural resource with eco-friendly properties that can help meet the growing demand for sustainable materials. This talk will highlight our understanding of structure-process-property relationships of silk-based materials, with emphasis on how dityrosine crosslinking can be used to design silk protein-based hydrogels for biomedical applications.