Infrared photoluminescence from lead sulfide quantum dots in glasses enriched in sulfur

Han, N.,Liu, C.,Zhang, J.,Zhao, X.,Heo, J.,Jiang, Y. North-Holland 2014 Journal of non-crystalline solids Vol.391 No.-

Formation of PbS QDs in the glasses containing a small amount of lead oxide was examined. Oversaturation of sulfur only was sufficient to promote the formation of PbS QDs in the glasses. Upon thermal treatment, absorption of PbS QDs was tuned from 824nm to 2213nm. Infrared photoluminescence, especially, mid-infrared photoluminescence from PbS QDs was observed in the range of 1008nm to 2182nm. Ostwald ripening of PbS QDs occurred when the heat-treatment temperature was 530<SUP>o</SUP>C or 540<SUP>o</SUP>C, and led to the decrease in the absorption coefficients and splitting of the photoluminescence bands.

Biofilm formation by Vibrio parahaemolyticus on food and food contact surfaces increases with rise in temperature

Han, N.,Mizan, Md.F.R.,Jahid, I.K.,Ha, S.D. Butterworths ; Taylor Francis ; Elsevier Science 2016 FOOD CONTROL Vol.70 No.-

<P>Vibrio parahaemolyticus is recognized as a human foodborne pathogen that is mostly associated with seafood. This pathogen can form a mature biofilm on food and food contact surfaces during food processing. The present study investigated V. parahaemolyticus biofilm formation at various temperatures on shrimp, crab, and stainless steel coupons, using the biofilm formation index (BFI) method on microtiter plates. The results were also confirmed by field emission scanning electron microscopy. Both the BFI values and cultural counts revealed that V. parahaemolyticus biofilm formation was stronger at higher temperatures than at lower temperatures. Biofilm formation differed according to the growth surface type and growth temperature. It was found that higher temperatures (15-37 degrees C) induced stronger biofilm formation whereas 4 and 10 degrees C resulted in attachment of the bacterial cells as monolayers. It could be concluded that temperatures of 25-37 degrees C result in significantly stronger biofilm formation as well as exoprotease and AI-2 production on food and food contact surfaces, indicating that these temperatures might be threatening conditions for food safety. (C) 2016 Published by Elsevier Ltd.</P>

Threading dislocation reduction in epitaxial GaN using V-groove patterned sapphire substrate with embedded silica nanospheres

Han, N.,Park, Y. J.,Han, M.,Ryu, B. D.,Ko, K. B.,Chandramohan, S.,Choi, C. J.,Cuong, T. V.,Hong, C. H. Elsevier Science B.V., Amsterdam. 2014 Materials letters Vol.123 No.-

dramatic reduction in threading dislocation density and stress-relaxation was simultaneously achieved in GaN epilayer using a silica nanosphere embedded structure on V-groove patterned sapphire substrate by metal-organic chemical vapor deposition. By depositing silica nanospheres at two different instances during a growth process, a two-step growth that included selective area growth and lateral overgrowth was initiated. This approach led to GaN template of high crystal quality, which was confirmed from x-ray diffraction rocking curve and micro-Raman measurements and further corroborated by transmission electron microscopy. GaN light-emitting diode fabricated by this strategy showed a significant enhancement in the light output power. (C) 2014 Elsevier B.V. All rights reserved.

Origin of highly efficient photoluminescence in AgIn5S8 nanoparticles

Han, N.,Yoon, H.,Jeong, S.,Oh, J.,Park, S.,Do, Y.,Song, J. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.29

The major aliphatic glucosinolate content in Korean radish during vegetative and reproductive growth

Han, N.,Su’udi, M.,Kim, J. Springer Science + Business Media 2015 Horticulture, Environment, and Biotechnology Vol.56 No.2

South Korea’s April Revolution through the Lens of West Germany

Hannes B. MOSLER 한국학중앙연구원 한국학중앙연구원 2020 Korea Journal Vol.60 No.3

This article investigates how the 1960 April Revolution in South Korea was reflected in the contemporary West German press and the diplomatic cables to Bonn. While in general the topic of the April Revolution is well documented and well researched, how events regarding the student movement were evaluated and depicted in Germany’s media and politics has not yet been subject to academic scrutiny despite the intriguing parallels between the two countries’ geopolitical dilemma that existed during the Cold War. By analyzing historical sources such as media reports, government-issued publications, and diplomatic cables retrieved from the Political Archive of the Federal Foreign Office, the present article explores the following three research questions to illuminate yet another facet of the historic student movement. First, how did the German press and diplomatic corps evaluate President Rhee Syngman’s rule of South Korea? Second, how did they assess the significance of the student movement? Third, how did they explain the reasons for the uprising and project its effects?

Detection of antibodies to human melanoma cell in vitiligo by western blot analysis

Hann, Seung-Kyung,Kim, Jung-Bin Yonsei University, College of Medicine 1995 Yonsei medical journal Vol.36 No.5

Symmetry, ratio and proportion in Scottish clan tartans - Templates for modern designers -

Hann, Michael,Wang, Chaoran The Costume Culture Association 2016 服飾文化硏究 Vol.24 No.6

It is common knowledge that a conventionally woven textile consists of two assemblies of parallel threads (warp and weft), one interlaced with the other at ninety degrees. Where each of the two assemblies is arranged in a particular colour sequence, a check design, known as a 'tartan', may be created. Although similar check-type cloths have been produced worldwide, it is the tartans of Scotland which have received most attention and it is here that a complex set of rules evolved and tartans of different types became associated traditionally with different regions, family groups or 'clans'. There is an impressive array of publications focused on the identification of tartans and their clan associations. This paper explains the nature of tartans, analyses typical surface structures, ratios and proportions, and suggests possible avenues of use for modern designers. The principal sources of data were a collection of tartans held at ULITA - An Archive of International Textiles (University of Leeds, UK) and Stewart's 1974 publication The Setts of Scottish Tartans. Based on the observation that divisions into halfs and thirds were dominant, a series of templates is presented with the intention of developing an awareness among designers that ratios and proportions used in familiar or traditional frameworks can be employed in a modern context.

Recent Investigations of Urinary Nerve Growth Factor as a Biomarker for Overactive Bladder Syndrome

Hann-Chorng Kuo 대한비뇨의학회 2009 Investigative and Clinical Urology Vol.50 No.9

Purpose: Overactive bladder (OAB) is a symptom syndrome and is usually diagnosed by subjective symptoms of urgency with or without urgency incontinence. However, because urgency symptoms are so subjective, it is difficult to objectively grade symptoms of urgency. Although urodynamic study can detect detrusor overactivity (DO) objectively, not all patients with OAB are found to have DO. Therefore, recent research interests have focused on urinary and image biomarkers in the assessment of OAB. Materials and Methods: Investigating articles from the literature and recent published works were reviewed. Results: The urinary nerve growth factor (NGF) level is found to increase in patients with OAB-wet, bladder outlet obstruction, mixed urinary incontinence, and urodynamic DO. NGF levels are correlated with OAB symptoms and return to normal after treatment. However, urinary NGF is not increased only in patients with OAB and DO. It also increases in patients with interstitial cystitis/painful bladder syndrome (IC/PBS) and other lower urinary tract diseases such as urinary tract stones, bacterial infection, and urothelial tumor. Thirty percent of OAB patients have a low urinary NGF level. Nevertheless, antimuscarinic or botulinum toxin treatment can decrease the urinary NGF level, and changes in the NGF level are correlated with the urgency severity scale. Conclusions: It is therefore possible to use urinary NGF levels as a biomarker for assessment of therapeutic outcome in patients with OAB. Further research on combined multiple biomarkers to differentiate OAB and IC/PBS is necessary. Purpose: Overactive bladder (OAB) is a symptom syndrome and is usually diagnosed by subjective symptoms of urgency with or without urgency incontinence. However, because urgency symptoms are so subjective, it is difficult to objectively grade symptoms of urgency. Although urodynamic study can detect detrusor overactivity (DO) objectively, not all patients with OAB are found to have DO. Therefore, recent research interests have focused on urinary and image biomarkers in the assessment of OAB. Materials and Methods: Investigating articles from the literature and recent published works were reviewed. Results: The urinary nerve growth factor (NGF) level is found to increase in patients with OAB-wet, bladder outlet obstruction, mixed urinary incontinence, and urodynamic DO. NGF levels are correlated with OAB symptoms and return to normal after treatment. However, urinary NGF is not increased only in patients with OAB and DO. It also increases in patients with interstitial cystitis/painful bladder syndrome (IC/PBS) and other lower urinary tract diseases such as urinary tract stones, bacterial infection, and urothelial tumor. Thirty percent of OAB patients have a low urinary NGF level. Nevertheless, antimuscarinic or botulinum toxin treatment can decrease the urinary NGF level, and changes in the NGF level are correlated with the urgency severity scale. Conclusions: It is therefore possible to use urinary NGF levels as a biomarker for assessment of therapeutic outcome in patients with OAB. Further research on combined multiple biomarkers to differentiate OAB and IC/PBS is necessary.

HEPATOTOXICITY OF PHOTOTOXIC DRUGS USED IN SYSTEMIC PHOTOCHEMOTHERAPY

Hann, Seung-Kyung,Choi, Gwang-Seong,Park, Yoon-Kee Korean Society of Photoscience 1996 Journal of Photosciences Vol.3 No.1

Psoralens are metabolized in the liver and thus can produce liver damage in laboratory animals when given in excessive doses. However, in humans, reports of the effects of psoralens on liver functions during photochemotherapy have been contradictory. We studied 311 patients t o observe the effects of various phototoxic drugs: 8-methoxypsoralen (8-MOP), 5-methoxypsoralen (5-MOP), 4,5,8-trimethylpsoralen (TMP)-on liver function during photochemotherapy. Of the 311 patients, only seven had transient elevations of transaminases. Incidence of hepatotoxicity of 8-MOP, TMP and 5-MOP showed 0.6%, 6% and 3%, respectively. Although the effects of psoralens on liver functions during photochemotherapy have been contradictory in humans and there have been few cases showing transient elevated values of liver transaminases during photochemotherapy, it is advisable to obtain serial liver function tests before and during photochemotherapy.