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Park, Minjoon,Do, Kyungsik,Kim, Jaemin,Son, Donghee,Koo, Ja Hoon,Park, Jinkyung,Song, Jun-Kyul,Kim, Ji Hoon,Lee, Minbaek,Hyeon, Taeghwan,Kim, Dae-Hyeong Wiley (John WileySons) 2015 Advanced healthcare materials Vol.4 No.7
<P>Oxide nanomembrane hybrids with enhanced mechano- and thermo-sensitivity for semitransparent epidermal electronics are developed. The use of nanomaterials (single wall nanotubes and silver nanoparticles) embedded in the oxide nanomembranes significantly enhances mechanical and thermal sensitivities. These mechanical and thermal sensors are utilized in wheelchair control and hypothermia detection, which are useful for patients with strokes.</P>
Kyul Jo,Hee-Jung Cho,Hee Yi,Soo-Min Cho,Jin-A Park,Chan-Hyeok Kwon,Hee-Ra Park,Ki-Sung Kwon,Ho-Chul Shin 한국실험동물학회 2011 Laboratory Animal Research Vol.27 No.1
This study was developed and validated for the determination of oxyclozanide residue concentrations in beef and commercial milk, using high-performance liquid chromatography system. Oxyclozanide was successfully separated on a reverse phase column (Xbridge-C18, 4.6×250 ㎜, 5 ㎛) with a mobile phase composed of acetonitrile and 0.1% phosphoric acid (60:40, v/v%). This analytical procedure involved a deproteinization process using acetonitrile for beef and 2% formic acid in acetonitrile for commercial milk, dehydration by adding sodium sulfate to the liquid analytical sample, and a defatting process using n-hexane; after these steps, the extract was exposed to a stream of nitrogen dryness. The final extracted sample was dissolved in the mobile phase and filtered using a 0.45 ㎛ syringe filter. This method had good selectivity and recovery (70.70±7.90-110.79±14.95%) from the matrices. The LOQs ranged from 9.7 to 9.8 ㎍/㎏ for beef and commercial milk. The recoveries met the standards set by the CODEX guideline.
Variations in pedestrian mean radiant temperature based on the spacing and size of street trees
Park, Chae Yeon,Lee, Dong Kun,Krayenhoff, E. Scott,Heo, Han Kyul,Hyun, Jung Hee,Oh, Kyushik,Park, Tae Yoon Elsevier 2019 Sustainable cities and society Vol.48 No.-
<P><B>Abstract</B></P> <P>There has been no study on the impacts of street tree interval on the street-level radiant environment, although it has been a key factor in the design of thermally comfortable streets. In this study, the variation in pedestrian mean radiant temperature (MRT) is investigated as a function of the tree interval using a newly developed multilayer MRT model. Tree size and street size are considered in the model experiments. The results show that MRT was most effectively reduced by large trees, indicating that they may be planted at wider intervals compared to smaller trees to achieve comparable MRT reductions. Furthermore, as the tree interval decreases, MRT reduction was increased exponentially by small trees, while MRT reduction was increased linearly by large trees. Therefore, urban planners can reduce pedestrian exposure to radiation by planting either larger trees or closely spaced smaller trees. These results provide insight into optimal configurations of street trees for maximum reduction of MRT in a variety of urban canyon configurations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Street trees reduce pedestrian MRT by intercepting and reflecting radiation fluxes. </LI> <LI> Large trees reduced MRT by 23.5 K more than small trees. </LI> <LI> The MRT reduction effect of small trees increases exponentially with reduced spacing. </LI> </UL> </P>
-Kyul Park,Tae-Seop Kim,Dong-Ho Geum,Sang-Yong Yoon,Jae-Min Song,Dae-Seok Hwang,Yeong-Cheol Cho,Uk-Kyu Kim 대한구강악안면외과학회 2015 대한구강악안면외과학회지 Vol.41 No.2
Squamous cell carcinoma (SCC) is the most common malignant tumor in the oral cavity, and it accounts for about 90% of all oral cancers. Several risk factors for oral SCC have been identified; however, SCC associated with odontogenic keratocysts have rarely been reported. The present study describes the case of a 36-year-old man with SCC of the right ramus of the mandible, which was initially diagnosed as a benign odontogenic cyst. He underwent enucleation at another hospital followed by segmental mandibulectomy and fibular free flap reconstruction at our institution. In this case, we introduce a patient with oral cancer associated with odontogenic cyst on the mandible and report a satisfactory outcome with wide resection and imme- diate free flap reconstruction.
The Retrospective Study of Closed Reduction of Nasal Bone Fracture
Park, Han-Kyul,Lee, Jae-Yeol,Song, Jae-Min,Kim, Tae-Seup,Shin, Sang-Hun Korean Association of Maxillofacial Plastic and Re 2014 Maxillofacial Plastic Reconstructive Surgery Vol.36 No.6
Purpose: This study was conducted in order to investigate the therapeutic effect of closed reduction according to a classification in patients with nasal bone fracture. Methods: The study was conducted retrospectively on 186 patients with a mean age of 38 years (range: 7 to 80 years). All patients were diagnosed by clinical and radiologic examination, and then classified according to Hwang's classification by computed tomography. The patients were further classified by their age, gender, causes of fracture, operation timing after fracture, concurrent facial bone fracture, and complications. All patients underwent the same reduction and treatment protocol and were then followed up regularly for at least three months. Results: The cause of the fracture was slip down, and the highest prevalence was shown in the 20s. The mean operation timing after fracture was 4.1 days (range: 1 to 14 days), and it tended to be longer in the case of defected septal bone or more severe fracture. The most common concurrent facial bone fracture was orbital blow-out fracture, and zygomaticomaxillary complex and maxillary fracture occured frequently. The largest number of complications occurred in class III and IIBs patients, and the main complication was postoperative pain. Conclusion: Results of nasal bone closed reduction on the 186 patients showed that serious complications rarely occurred. Closed reduction is generally an effective treatment for nasal bone fracture. However, in the case of severe concurrent septal bone fracture or comminuted fracture with depression, open reduction should be considered. Further study with a larger number of patients and further classification is required.