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Hong JeongHa's Tianyuanshu and Zhengcheng Kaifangfa
홍성사,홍영희,김영욱,Hong, Sung Sa,Hong, Young Hee,Kim, Young Wook The Korean Society for History of Mathematics 2014 Journal for history of mathematics Vol.27 No.3
Tianyuanshu and Zengcheng Kaifangfa introduced in the Song-Yuan dynasties and their contribution to the theory of equations are one of the most important achievements in the history of Chinese mathematics. Furthermore, they became the most fundamental subject in the history of East Asian mathematics as well. The operations, or the mathematical structure of polynomials have been overlooked by traditional mathematics books. Investigation of GuIlJib (九一集) of Joseon mathematician Hong JeongHa reveals that Hong's approach to polynomials is highly structural. For the expansion of $\prod_{k=11}^{n}(x+a_k)$, Hong invented a new method which we name Hong JeongHa's synthetic expansion. Using this, he reveals that the processes in Zhengcheng Kaifangfa is not synthetic division but synthetic expansion.
3D/2D convertible projection-type integral imaging using concave half mirror array.
Hong, Jisoo,Kim, Youngmin,Park, Soon-Gi,Hong, Jong-Ho,Min, Sung-Wook,Lee, Sin-Doo,Lee, Byoungho Optical Society of America 2010 Optics express Vol.18 No.20
<P>We propose a new method for implementing 3D/2D convertible feature in the projection-type integral imaging by using concave half mirror array. The concave half mirror array has the partially reflective characteristic to the incident light. And the reflected term is modulated by the concave mirror array structure, while the transmitted term is unaffected. With such unique characteristic, 3D/2D conversion or even the simultaneous display of 3D and 2D images is also possible. The prototype was fabricated by the aluminum coating and the polydimethylsiloxane molding process. We could experimentally verify the 3D/2D conversion and the display of 3D image on 2D background with the fabricated prototype.</P>
PARAMETRIC STUDY ON TRANSIENT HOT-WIRE METHOD TO MEASURE NANOFLUID CONDUCTIVITIES
Hong, Sung-Wook,Jung, Jung-Yeul,Kang, Yong-Tae,Koo, June-Mo The Society of Air-Conditioning and Refrigerating 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.3
Recently, nanofluid is a hot research topic among thermal engineers to enhance the heat transfer. However, there are deviations between research groups in the effective thermal conductivity measurements by the transient hot-wire method. Since there has been no report for the researchers to select a proper data range of temperature to estimate the thermal conductivities, the deviation could be partly attributed to the poor selection of the temperature data range. In this study, the impacts of the data range selection, the power supplier response delay, the thermal coefficient of resistors, the hot-wire type and test section size on the thermal conductivity measurement using the transient hot-wire method are analyzed. The proper selection of the temperature data range to be used to estimate the thermal conductivities of fluids using transient hot-wire method is suggested by investigating the impact of it on the measurement by both computationally and experimentally. The thermal coefficient of resistor is found to affect the measurement seriously whereas the type of hot-wire does not. The test section size of the measuring device is compared with the thermal penetration depth.
Current Status of Mammal Fauna on Jindo Island, Korea
Hong Shik Oh,Seon Mi Park,Yoo Kyung Kim,Sang Hyun Han,Hwa Jin Lee,Jeong Wook Ha 한국동물분류학회 2016 Animal Systematics, Evolution and Diversity Vol.- No.s9
In the present study, to explore the current status of mammals that inhabit Jindo Island, Jeollanam-do, South Korea, a survey was conducted from July 6 to July 9, 2016. Using several survey methods, such as Sherman’s live trap, footprint, caves, excretions, and road-kill investigations, the mammals observed on Jindo Island were found to be from 5 orders and 9 families, including 12 species in total. Among them, three species of small mammals were Mogera wogura, Crocidura shantungensis, and Apodemus agrarius. Additionally, two legally protected species were found through excretion observations. Lutra lutra and Prionailurus bengalensis, which were designated to endangered wild animal classes I and II, respectively. The survey results can be used as a valuable resource for identifying the distribution and habitat status of mammals in the Jindo-gun area, as well as for building a database for ecosystem preservation.
( Sang Ho Park ),( Sun Hyo Lee ),( Ji Sung Lee ),( Won Yong Shin ),( Hyo Wook Gil ),( Jong Oh Yang ),( Eun Young Lee ),( Sae Yong Hong ) 대한신장학회 2015 Kidney Research and Clinical Practice Vol.34 No.2
Background: Although cross-sectional studies have suggested a relationship between proton pump inhibitor (PPI) use and hypomagnesemia, no large-scale cohort study has been conducted to date. Here, we examined the changes in serum magnesium levels in response to PPI use. We hypothesized that PPI use might change the serum magnesium concentration. Methods: Of the 2,892 patients hospitalized for percutaneous coronary intervention between January 2007 and May 2012, 1,076 patients with normal baseline (1.6- 2.5 mg/dL) and follow-up serum magnesium concentrations were enrolled. These patients were divided into two groups: the PPI group and the control group. Results: The mean follow-up period was 9.5172.94 months. The incidence of hypomagnesemia (o1.6 mg/dL) was 0.4% (3/834) in the PPI group and 0.4% (1/242) in the control group (P ¼0.904). The change in magnesium levels did not differ between the two groups, and this result was maintained in the analysis of covariance after adjusting for confounding factors (P ¼ 0.381). Moreover, magnesium levels did not significantly differ between the long-term (duration of use Z12 months, n ¼ 71) and short-term PPI groups (duration of use o12 months, n ¼ 763), and the control group (n ¼ 242; P ¼ 0.620). The effect of PPI use on change in serum magnesium concentration was affected by the use of multiple diuretics ( 0.0170.25 mg/dL; P ¼ 0.025), although a single diuretic use with PPI did not alter the change in magnesium level (0.1270.27 mg/dL). Conclusion: Changes in magnesium levels might be subtle after PPI use in patients with normal baseline magnesium values.
Sung-wook Lee,Young-hun Kim,Bo-young Lee,Byung-seop Hong,Kwang-salk Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
The behaviors of diffusion and out-diffusion of Cu in silicon wafers through the gate oxide during post-gate-oxidation heat treatment were investigated. In order to obtain an accurate understanding, We employed the 65Cu isotope to decrease the experimental error. Also, the 65Cu on the surface was measured using vapor phase decomposition inductively coupled plasma mass spectrometry (VPD-ICP-MS), and the 65Cu in the bulk that out-diffused to the surface was analyzed by IR-heating the silicon wafers. From this newly designed methodology, the different behaviors of Cu between intrinsic and non-intrinsic gettering during the post-gate-oxidation process could be successfully explained.