평면 레이저유도 형광법을 이용한 부상화염의 특성 연구

이병준,정석호,한재원,Lee, Byeong-Jun,Jeong, Seok-Ho,Han, Jae-Won 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.11

Characteristics of the lifted flame which is generated by issuing of the fuel through the miniature nozzle, d = 0.164 mm, are studied using the planar laser induced fluorescence technique. OH radical is excited on the $Q_{1}$(8) line of the $A^{2}$.SIGMA.$^{+.leq.X2}$ .PI.(1, 0) band transition (283.55 nm) and LIF signals are captured at the bands of (0, 0) and (1, 1) transition (306 ~ 326 nm) using the filters and ICCD camera. Hydroxyl radical (OH) profile for nozzle attached flame shows that OH radical populations at the flame sides and flame tip are larger than those at the base. But for the lifted flame (tribrachial flame) case, those are larger at the flame base than at the flame tip and flame sides. The OH radical is more dense near the center line of flame base at the blowing out. This fact proves the Chung and Lee's blowout theory-blowout occurs when the flame is anchored at the flame axis. axis.

국내·외 누설률에 관한 기준 분석을 통한 국내 연기제어 기준 개선에 관한 연구

김혜원 ( Kim Hye-won ),한지우 ( Han Ji-woo ),이병흔 ( Lee Byeong-heun ),진승현 ( Jin Seung-hyeon ),권영진 ( Kwon Young-jin ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2

On this Study, it conducts the Standards investigation about air leakage of Buildings for performance improvement of Smoke control in Fire. In domestic standards, it is incomplete the Criteria standards of air leakage. Therefore it is considered that won’t limit the smoke spread due to stack effect. But in the case of the United States, it conducts the Hot smoke air-Leakage test and it consider that can prevent the Smoke Spread in Compartment.

일부 농촌지역 재가 장애인의 요구도 분석

정병옥,이규리,김근조,박흥기,김본원,Jung, Byeong-Ok,Lee, Cu-Rie,Kim, Keun-Jo,Park, Heung-Ki,Kim, Bonn-Won 대한물리치료과학회 2006 대한물리치료과학회지 Vol.13 No.4

The survey was conducted with participation of the 289 handicapped persons residing at the rural area OOeup-gun in Kyungbook for the period of March 2 - May 31, 2006, to study the nature in general of the handicapped and the boundaries of their need. For the nature in general of the handicapped, the study was done by gender iscrimination, age, marital status, religion, educational level, occupation, monthly income, disability cause, disabled duration, disability type, disability level. For the boundaries of their need, the study was done by demand of financial support, educational demand, demand of voluntary workers, need of rehabilitation and medical treatment, job training, improvement of living conditions, or so. Using the Win.SPSS program, we made a frequency analysis and conclusions on the nature in general of the handicapped and the boundaries of their need on a 2-test. Conclusions are : 1. Nature in general of the handicapped The existence of the handicapped shows high at the age over 51 (71.6%), male-handicapped (65.1%), primary school graduates (62.9%), farming engaging (65.2%), monthly income less than one million Won (80.5%), cause by disease (53.8%), duration more than 10 years (61.6%), disability at level 3 (39.8%), extremity disability (66.4%). 2. Correlation of nature in general with demand of the handicapped a. In demanding the financial support, support for helper’s compensation shows high (p<0.05). In demanding the necessity of voluntary workers, the male-handicapped appears high during the absence of family assistance and the female-handicapped appears differently per week and also appears high during the absence of family assistance (p<0.05). b. In educational demand of the handicapped by their age, the age below 30 demands technical-job training and the age over 31 demands medical education for health care (p<0.01). c. In demanding the financial support by educational level, support for living cost shows high (p<0.05). d. In demanding improvement of living conditions by postnatal cause of disability, improvement of house structure shows high (p<0.05). e. In demanding assistance of voluntary workers by disabled duration, "No Need" shows high in the disabled duration more than 4 years (p<0.05). f. In demanding rehabilitation and medical treatment by disability type, home-visiting treatment, oriental medical treatment and physical therapy show high (p<0.001). g. In educational demand by disability level, medical education for health care shows high (p<0.01).

조선후기 천문학자 이덕성의 생애와 천문활동

안영숙,민병희,서윤경,이기원,AHN, YOUNG SOOK,MIHN, BYEONG-HEE,SEO, YOON KYEONG,LEE, KI-WON 한국천문학회 2017 天文學論叢 Vol.32 No.2

The life and astronomical activity of Lee Deok-Seong (李德星, 1720-1794) was studied using various historical sources, including the astronomical almanac, Seungjeongwon-Ilgi (Daily records of Royal Secretariat of Joseon dynasty), and the Gwansang-Gam's logbooks during Joseon dynasty (A.D. 1392-1910). We present the results of the study including the following main findings. First, from the investigation of Lee's family tree, we find that a number of his relatives were also astronomers, notably Samryeok-Gwan (三曆官, the post of calendrical calculation). Second, we find that he took part in the compilation of an annual astronomical almanac over a period of at least 16 years. His major achievements in the astronomy of the Joseon dynasty were to establish a new method of calendar-making calculation and to bring astronomical materials to the Joseon court through a visit to China. The Joseon dynasty enforced the Shixianli (時憲曆, a Chinese calendar made by Adam Shall) in 1654 without fully understanding the calendar. So an astronomer and an envoy were dispatched to China in order to master the intricacies of the calendar and to learn as much of Western science as was available in that time and place. Lee Deok-Seong worked at the Gwansang-Gam (觀象監, Royal Astronomical Bureau) during the reigns of King Yeongjo (英祖) and Jeongjo (正祖). As best as we can ascertain in relation with the calculations in the Shixian calendar, Lee visited China four times. During his trips and interactions, he learned a new method for calendar-making calculations, and introduced many Western-Chinese astronomical books to Joseon academia. Lee greatly improved the accuracy of calendrical calculations, even while simplifying the calculation process. With these achievements, he finally was promoted to the title of Sungrok-Daebu (崇祿大夫), the third highest grade of royal official. In conclusion, history demonstrates that Lee Deok-Seong was one of the most outstanding astronomers in the late-Joseon dynasty.

Tonicity-responsive enhancer-binding protein promotes hepatocellular carcinogenesis, recurrence and metastasis

Lee, Jun Ho,Suh, Jae Hee,Choi, Soo Youn,Kang, Hyun Je,Lee, Hwan Hee,Ye, Byeong Jin,Lee, Gap Ryol,Jung, Seok Won,Kim, Chang Jae,Lee-Kwon, Whaseon,Park, Jiyoung,Myung, Kyungjae,Park, Neung Hwa,Kwon, Hyu BMJ Publishing Group 2019 Gut: journal of the British Society of Gastroenter Vol.68 No.2

<P><B>Objectives</B></P><P>Hepatocellular carcinoma (HCC) is a common cancer with high rate of recurrence and mortality. Diverse aetiological agents and wide heterogeneity in individual tumours impede effective and personalised treatment. Tonicity-responsive enhancer-binding protein (TonEBP) is a transcriptional cofactor for the expression of proinflammatory genes. Although inflammation is intimately associated with the pathogenesis of HCC, the role of TonEBP is unknown. We aimed to identify function of TonEBP in HCC.</P><P><B>Design</B></P><P>Tumours with surrounding hepatic tissues were obtained from 296 patients with HCC who received completion resection. TonEBP expression was analysed by quantitative reverse transcription–quantitative real-time PCR (RT-PCR) and immunohfistochemical analyses of tissue microarrays. Mice with TonEBP haplodeficiency, and hepatocyte-specific and myeloid-specific TonEBP deletion were used along with HCC and hepatocyte cell lines.</P><P><B>Results</B></P><P>TonEBP expression is higher in tumours than in adjacent non-tumour tissues in 92.6% of patients with HCC regardless of aetiology associated. The TonEBP expression in tumours and adjacent non-tumour tissues predicts recurrence, metastasis and death in multivariate analyses. TonEBP drives the expression of cyclo-oxygenase-2 (COX-2) by stimulating the promoter. In mouse models of HCC, three common sites of TonEBP action in response to diverse aetiological agents leading to tumourigenesis and tumour growth were found: cell injury and inflammation, induction by oxidative stress and stimulation of the COX-2 promoter.</P><P><B>Conclusions</B></P><P>TonEBP is a key component of the common pathway in tumourigenesis and tumour progression of HCC in response to diverse aetiological insults. TonEBP is involved in multiple steps along the pathway, rendering it an attractive therapeutic target as well as a prognostic biomarker.</P>

A case of patent ductus arteriosus in a holstein calf

Byeong-Han Lee,Won-Gon Kim 대한수의학회 2004 Journal of Veterinary Science Vol.5 No.1

This report describes a case of patent ductus arteriosus (PDA) which was found in a calf during an experiment on an implantable ventricular assist device. This is the first case report of PDA confirmed in the calf in Korea.

Modification of PLGA Nanofibrous Mats by Electron Beam Irradiation for Soft Tissue Regeneration

Lee, Jae Baek,Ko, Young-Gwang,Cho, Donghwan,Park, Won Ho,Kim, Byeong Nam,Lee, Byeong Cheol,Kang, Inn-Kyu,Kwon, Oh Hyeong Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-

<P>Biodegradable poly(lactide-co-glycolide) (PLGA) has found widespread use in modern medical practice. However, the degradation rate of PLGA should be adjusted for specific biomedical applications such as tissue engineering, drug delivery, and surgical implantation. This study focused on the effect of electron beam radiation on nanofibrous PLGA mats in terms of physical properties and degradation behavior with cell proliferation. PLGA nanofiber mats were prepared by electrospinning, and electron beam was irradiated at doses of 50, 100, 150, 200, 250, and 300 kGy. PLGA mats showed dimensional integrity after electron beam irradiation without change of fiber diameter. The degradation behavior of a control PLGA nanofiber (0 kGy) and electron beam-irradiated PLGA nanofibers was analyzed by measuring the molecular weight, weight loss, change of chemical structure, and fibrous morphology. The molecular weight of the PLGA nanofibers decreased with increasing electron beam radiation dose. The mechanical properties of the PLGA nanofibrous mats were decreased with increasing electron beam irradiation dose. Cell proliferation behavior on all electron beam irradiated PLGA mats was similar to the control PLGA mats. Electron beam irradiation of PLGA nanofibrous mats is a potentially useful approach for modulating the biodegradation rate of tissue-specific nonwoven nanofibrous scaffolds, specifically for soft tissue engineering applications.</P>

Simultaneous Enhancement of Upconversion and Downshifting Luminescence via Plasmonic Structure

Lee, Kyu-Tae,Park, Jong-Hyun,Kwon, S. Joon,Kwon, Hyun-Keun,Kyhm, Jihoon,Kwak, Kyung-Won,Jang, Ho Seong,Kim, Su Yeon,Han, Joon Soo,Lee, Sung-Hwan,Shin, Dong-Hun,Ko, Hyungduk,Han, Il-Ki,Ju, Byeong-Kwon American Chemical Society 2015 NANO LETTERS Vol.15 No.4

<P>We describe a metal nanodisk–insulator–metal (MIM) structure that enhances lanthanide-based upconversion (UC) and downshifting (DS) simultaneously. The structure was fabricated using a nanotransfer printing method that facilitates large-area applications of nanostructures for optoelectronic devices. The proposed MIM structure is a promising way to harness the entire solar spectrum by converting both ultraviolet and near-infrared to visible light concurrently through resonant-mode excitation. The overall photoluminescence enhancements of the UC and DS were 174- and 29-fold, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-4/nl5049803/production/images/medium/nl-2014-049803_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5049803'>ACS Electronic Supporting Info</A></P>

Highly-sensitive and highly-correlative flexible motion sensors based on asymmetric piezotronic effect

Lee, Jae Won,Ye, Byeong Uk,Wang, Zhong Lin,Lee, Jong-Lam,Baik, Jeong Min Elsevier 2018 Nano energy Vol.51 No.-

<P><B>Abstract</B></P> <P>This paper describes two highly-sensitive flexible motion sensors (piezoelectric nanogenerators and ultraviolet light emitting diodes based flexible GaN) based on asymmetric polarization created across flexible GaN film and very high correlations of the sensors for precise motion measurement. The operation mechanism is based on piezotronic effect using polarization charges at the interface for tuning the electronic and optoelectronic processes. The nanogenerator showed very high sensitivity (<I>S</I> = 93 at 0.45% under concave bending) and the convex bending led to the decrease of the sensitivity to 24. The electroluminescence intensity also almost linearly decreased with the change of the bending direction, clearly shown in the confocal scanning electroluminescence microscopy images with the bending motion. The two sets of measures showed very high correlations (<I>R</I> <SUP>2</SUP> = 0.98 and 0.96 under concave and convex bending, respectively) with very sensitive directional information. This approach makes to recognize the direction of bending as well as to measure the magnitude of the strain for realizing multi-functional, motion detection sensing devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two highly-sensitive flexible motion sensors (piezoelectric nanogenerators and UV-LEDs based on GaN) has been demonstrated. </LI> <LI> The operation mechanism is based on piezotronic effect using asymmetric polarization charges at the interface. </LI> <LI> The nanogenerator shows very high sensitivity (<I>S</I> = 93 at 0.45%) under concave bending. </LI> <LI> The electroluminescence intensity of Flexible LEDs linearly increased as it was bent from convex to concave bending motion. </LI> <LI> The two sets of measures show very high correlations with very sensitive directional information. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The table of contents entry: Here, for the first time, we describe a strategy to recognize the direction of bending as well as to measure the magnitude of the strain for realizing multi-functional, motion detection sensing devices. The operation mechanism is based on piezotronic effect using asymmetric polarization charges at the interface, which makes it possible to fabricate highly-sensitive two motion sensors. The two sets of measures show very high correlations (<I>R</I> <SUP>2</SUP> = 0.98 and 0.96 under concave and convex bending, respectively) with very sensitive directional information.</P> <P>[DISPLAY OMISSION]</P>

Thermoelectric properties of I-doped Bi2Te2.85Se0.15 solid solutions

Lee, Go-Eun,Kim, Il-Ho,Lim, Young Soo,Seo, Won-Seon,Choi, Byeong-Jun,Hwang, Chang-Won 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.

I-doped Bi2Te2.85Se0.15 solid solutions were prepared by encapsulated melting and hot pressing. The electrical conductivity and the electronic thermal conductivity were increased due to an increase in the carrier concentration with increasing I content, but the lattice thermal conductivity was reduced because I atoms affected the lattice disorder, with I atoms acting as phonon scattering centers. The undoped solid solution showed a carrier concentration of 7.37 x 10(19) cm(-3), a power factor of 2.1 mWm(-1)K(-2) and a dimensionless figure of merit (ZT) of 0.56 at 323 K. The ZT value was improved due to an increase in the power factor by I doping, and the maximum ZT was obtained as 0.90 at 423 K for Bi2Te2.85Se0.15:I-0.005.