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Exceptional Lithium Storage in a Co(OH)<sub>2</sub> Anode: Hydride Formation
Kim, Hyunchul,Choi, Woon Ih,Jang, Yoonjung,Balasubramanian, Mahalingam,Lee, Wontae,Park, Gwi Ok,Park, Su Bin,Yoo, Jaeseung,Hong, Jin Seok,Choi, Youn-Suk,Lee, Hyo Sug,Bae, In Tae,Kim, Ji Man,Yoon, Won- American Chemical Society 2018 ACS NANO Vol.12 No.3
<P>Current lithium ion battery technology is tied in with conventional reaction mechanisms such as insertion, conversion, and alloying reactions even though most future applications like EVs demand much higher energy densities than current ones. Exploring the exceptional reaction mechanism and related electrode materials can be critical for pushing current battery technology to a next level. Here, we introduce an exceptional reaction with a Co(OH)<SUB>2</SUB> material which exhibits an initial charge capacity of 1112 mAh g<SUP>-1</SUP>, about twice its theoretical value based on known conventional conversion reaction, and retains its first cycle capacity after 30 cycles. The combined results of synchrotron X-ray diffraction and X-ray absorption spectroscopy indicate that nanosized Co metal particles and LiOH are generated by conversion reaction at high voltages, and Co<SUB><I>x</I></SUB>H<SUB><I>y</I></SUB>, Li<SUB>2</SUB>O, and LiH are subsequently formed by hydride reaction between Co metal, LiOH, and other lithium species at low voltages, resulting in a anomalously high capacity beyond the theoretical capacity of Co(OH)<SUB>2</SUB>. This is further corroborated by AIMD simulations, localized STEM, and XPS. These findings will provide not only further understanding of exceptional lithium storage of recent nanostructured materials but also valuable guidance to develop advanced electrode materials with high energy density for next-generation batteries.</P> [FIG OMISSION]</BR>
Action of <i>Dracocephalum argunense</i> on Mast Cell-Mediated Allergy Model
Kim, Sang-Hyun,Kim, Sug-Hyun,Kim, Sung-Hwa,Moon, Jin-Young,Park, Won-Hwan,Kim, Cheorl-Ho,Shin, Tae-Yong Pharmaceutical Society of Japan 2006 BIOLOGICAL & PHARMACEUTICAL BULLETIN Vol.29 No.3
<P>The discovery of drugs for the treatment of allergic disease is an important subject in human health. Stimulation of mast cells starts the process of degranulation resulting in releasing of mediators, such as histamine. In this report, we investigated the effect of aqueous extract of <I>Dracocephalum argunense</I> F<SMALL>ISCH</SMALL>. (Labiatae) (DAAE) on the mast cell-mediated allergic response and studied its possible mechanisms of action, focusing on the histamine release and pro-inflammatory cytokine secretion in mast cells. DAAE inhibited compound 48/80-induced systemic reactions and serum histamine release in mice. In addition, DAAE attenuated IgE-mediated skin allergic reaction. DAAE dose-dependently reduced IgE-induced histamine release from mast cells. The level of cAMP was transiently increased by treatment of DAAE. DAAE specifically blocked the phorbol 12-myristate 13-acetate (PMA) plus calcium ionophore A23187-induced p38 mitogen-activated protein kinase (MAPK) activation. DAAE decreased the secretion of pro-inflammatory cytokines, such as tumor necrosis factor-α and interleukin-6 in mast cells. Our findings provide evidence that DAAE inhibits mast cell derived allergic reactions, and involvement of cAMP for histamine release and p38 MAPK for pro-inflammatory cytokine secretion in these effects.</P>
Interdimensional universality of dynamic interfaces
Kim, Kab-Jin,Lee, Jae-Chul,Ahn, Sung-Min,Lee, Kang-Soo,Lee, Chang-Won,Cho, Young Jin,Seo, Sunae,Shin, Kyung-Ho,Choe, Sug-Bong,Lee, Hyun-Woo Macmillan Publishers Limited. All rights reserved 2009 Nature Vol.458 No.7239
Despite the complexity and diversity of nature, there exists universality in the form of critical scaling laws among various dissimilar systems and processes such as stock markets, earthquakes, crackling noise, lung inflation and vortices in superconductors. This universality is mainly independent of the microscopic details, depending only on the symmetry and dimension of the system. Exploring how universality is affected by the system dimensions is an important unresolved problem. Here we demonstrate experimentally that universality persists even at a dimensionality crossover in ferromagnetic nanowires. As the wire width decreases, the magnetic domain wall dynamics changes from elastic creep in two dimensions to a particle-like stochastic behaviour in one dimension. Applying finite-size scaling, we find that all our experimental data in one and two dimensions (including the crossover regime) collapse onto a single curve, signalling universality at the criticality transition. The crossover to the one-dimensional regime occurs at a few hundred nanometres, corresponding to the integration scale for modern nanodevices.
Parametric modeling of edge effects for polishing tool influence functions.
Kim, Dae Wook,Park, Won Hyun,Kim, Sug-Whan,Burge, James H Optical Society of America 2009 Optics express Vol.17 No.7
<P>Computer controlled polishing requires accurate knowledge of the tool influence function (TIF) for the polishing tool (i.e. lap). While a linear Preston's model for material removal allows the TIF to be determined for most cases, nonlinear removal behavior as the tool runs over the edge of the part introduces a difficulty in modeling the edge TIF. We provide a new parametric model that fits 5 parameters to measured data to accurately predict the edge TIF for cases of a polishing tool that is either spinning or orbiting over the edge of the workpiece.</P>
Mitochondrial microsatellite instability of colorectal cancer stroma
Kim, Hong Sug,Lim, Hee Sun,Lee, Sug Hyung,Lee, Jong Woo,Nam, Suk Woo,Park, Won Sang,Lee, Youn Soo,Lee, Jung Young,Yoo, Nam Jin Wiley Subscription Services, Inc., A Wiley Company 2006 International journal of cancer: Journal internati Vol.119 No.11
<P>Mitochondrial microsatellite instability (mtMSI) and mutations of mitochondrial DNA has been reported in cancer epithelia of carcinomas. However, mtMSI in cancer stroma has not yet been identified in human cancers. In this study, we attempted to determine if mtMSI occurs in the cancer stroma of sporadic colorectal cancers, and if the stromal mtMSI has any correlations with stromal nuclear MSI (nMSI) and cancer epithelial mtMSI. Nine microsatellite sequences within the D-loop and 5 coding genes for mtMSI, and 9 microsatellites for nMSI were analyzed in the microdissected cancer epithelia and adjacent stromas of 48 sporadic colorectal cancers. Overall, 23 somatic mitochondrial DNA alterations were detected in 15 cancer epithelia (31.2%) and 5 stromas (10.4%). The mutations consisted of 19 D-loop mtMSI alterations, and 1 missense and 3 framshift mutations of repeat sequences within the coding genes. All of the 5 stromal genetic alterations showed D-loop mtMSI. In regards to other MSI status, the stromal mtMSI had no association with stromal nMSI or epithelial mtMSI, either. These findings indicate that in addition to the cancer epithelia the cancer stroma harbor mtMSI, and suggest a possible role of stromal mtMSI in the pathogenesis of colorectal cancers. Furthermore, the data suggest that stromal mtMSI may occur independently of stromal nMSI and epithelial mtMSI in sporadic colorectal cancers. © 2006 Wiley-Liss, Inc.</P>
Correction of a nasal soft triangle deficiency as a complication of augmentation rhinoplasty
Kim, Eon Su,Heo, Jae Won,Yang, Chae Eun,Kim, Jiye,Kim, Sug Won Korean Cleft Palate-Craniofacial Association 2021 Archives of Craniofacial Surgery Vol.22 No.3
The soft tissue triangle is an easily recognizable subunit of the nose. Therefore, deformities in this region resulting from trauma or complications after cosmetic surgery can have serious cosmetic impacts. Various reconstruction choices exist for deformities such as depression of the soft triangle but choosing the most appropriate treatment in each case remains a challenge. In the case described herein, a patient underwent augmentation rhinoplasty with a silastic implant and experienced implant exposure in the soft triangle area. After implant removal, the patient complained of depression in this area. The authors effectively solved this problem through a de-epithelialized composite tissue graft. In this report, we present this case and review similar cases of reconstruction of the soft triangle.
Epidemiologic study of hand and upper extremity injuries by power tools
Kim, Yong Hun,Choi, Jin-hee,Chung, Yoon Kyu,Kim, Sug Won,Kim, Jiye Korean Society of Plastic and Reconstructive Surge 2019 Archives of Plastic Surgery Vol.46 No.1
Background Hand injuries caused by chain saws, electric saws, and hand grinders range from simple lacerations to tendon injuries, fractures, and even amputations. This study aimed to understand the distribution of various types of hand and upper extremity injuries caused by power tools, in order to help prevent them, by investigating the incidence and cause of power tool injuries treated over a 4-year period at a single institution in Korea. Methods We reviewed the medical records of patients who visited a single institution for power tool-induced injuries from 2011 to 2014. The distribution of sex, age, injured body part, type of injury, and mechanism of injury sustained by patients who received hand and upper extremity injuries from using an engine saw, electric saw, or hand grinder was evaluated. Results Among 594 subjects who were injured by power tools, 261 cases were hand and upper extremity injuries. The average age was 53.2 years. Tendon injury was the most common type of injury. An electric saw was the most common type of power tool used. More injuries occurred in non-occupational settings than in occupational settings. Conclusions In this study, power tool-induced hand and upper extremity injuries were mostly caused by direct contact with electric saw blades. More injuries occurred due to non-occupational use of these tools, but the ratios of amputations and structural injuries were similar in the non-occupational and occupational groups.
Ectopic pleomorphic adenoma on subcutaneous plane of the cheek
Kim, Yong Hun,Yoon, Hyung Woo,Kim, Jiye,Kim, Sug Won Korean Cleft Palate-Craniofacial Association 2019 Archives of Craniofacial Surgery Vol.20 No.1
Pleomorphic adenoma is the most common benign tumor of the salivary gland. Pleomorphic adenoma occurs most commonly in the parotid gland but it may involve other salivary gland such as submandible or lingual. We report an ectopic pleomorphic adenoma in the subcutaneous layer of the face. A woman presented with a mass of the nasolabial fold. After excision of the mass, it was revealed as an pleomorphic adenoma pathologically. An ectopic pleomorphic adenoma which was located in the subcutaneous layer of the face is very rare in medical literature.