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Kwon, Yo Han,Woo, Sang‐,Wook,Jung, Hye‐,Ran,Yu, Hyung Kyun,Kim, Kitae,Oh, Byung Hun,Ahn, Soonho,Lee, Sang‐,Young,Song, Seung‐,Wan,Cho, Jaephil,Shin, Heon‐,Cheol,Kim, Je Y WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.38
<P>The first ever demonstration of a cable‐type lithium ion battery architecture with outstanding omni‐directional flexibility is described by Je Young Kim, Heon‐Cheol Shin, and co‐workers on page 5192. The Front Cover image illustrates the unique battery architecture comprising a skeleton frame surrounding an empty space, that is, a hollow‐spiral anode with a multi‐helical structure. This design enables the battery to reliably power an LED screen or an MP3 player even under severe mechanical twisting and bending. </P>
Han, Man Yop,Kim, Sung Bo,Kang, Tae Heon Techno-Press 2015 Advances in concrete construction Vol.3 No.2
Holed-Incrementally Prestressed Concrete (H-IPC) girders are designed using the following new design concepts. At first, web openings reduce the self-weight of the girder, and also diffuse prestressing tendon anchorages. The reduced end anchoring forces decrease the web thickness of the end sections. Additionally, precast technology help to improve the quality of concrete and to reduce the construction period at the site. For experimentally verification, two 50 m full-scale H-IPC girders are manufactured with different concrete strength of 55 MPa and 80 MPa. The safety, stiffness, ductility, serviceability and crack development of H-IPC girder are measured and compared with each other for different strengths. Both girders show enough strength to carry live load and good stiffness to satisfy the design criteria. The experimental result shows the advantages of using high strength concrete and adopting precast girder. The test data can be used as a criterion for safety control and maintenance of the H-IPC girder.
A Simple Method for Identifying Mechanical Parameters Based on Integral Calculation
Sang-Heon Han,Anno Yoo,Sang Won Yoon,Young-Doo Yoon 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4
A method for the identification of mechanical parameters based on integral calculation is presented. Both the moment of inertia and the friction constant are identified by the method developed here, which is based on well-known mechanical differential equations. The mechanical system under test is excited according to a pre-determined low-frequency sinusoidal motion, minimizing the distortion, and increasing the accuracy of the results. The parameters are identified using integral calculation, increasing the robustness of the results against measurement noise. Experimental data are supported by simulation, confirming the effectiveness of the proposed technique. The performance improvements shown here are of use in the design of speed and position controllers and observers. Owing to its simplicity, this method can be readily applied to commercial inverter products.
Totally Laparoscopic Pancreaticoduodenectomy Using 3D Flexible Laparoscopic System
( Heon Tak Ha ),( Ja Ryung Han ),( Hyung Jun Kwon ),( Jae Min Chun ),( Sang-geol Kim ),( Yoon Jin Hwang ),( Young Seok Han ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Robotic PD has not yet been expanded due to the needs of the dedicated teams and the excessive costs. 3D flexible laparoscopic system (3D) with depth perception and spatial orientation allows the precise dissection of the dangerous site and facilitate the comfortable reconstruction. We present experiences regarding the efficacy of L-PD using 3D. Methods: Totally L-PD was attempted in 15 patients from June 2016 to June 2017. However, conversion to open PD was required in one patient with tumor invasion to the superior mesenteric vein. Pancreaticojejunostomy was completed with the dunking procedure in 1 patient and with duct-to-mucosa technique in 13 patients. Results: Mean operation time was 500 min. The replaced right hepatic artery originated from superior mesenteric artery of hepatic artery was identified in one patient and preserved well because of the precise dissection under the excellent visual field. The mean size of pancreatic duct and hepatic duct were 3 mm and 10 mm. There was no major intra-operative complications and post-operative mortality. Postoperative complications were detected in 7 patients, including pancreatic fistula (n=5), and delayed gastric emptying (n=2). All pancreatic fistula was grade A and were recovered with conservative treatment. Conclusions: In selected patients, L-PD is a safe and effective procedure with comparable surgical outcomes to open surgery. Especially, we believe that 3D will play an important role in the expansion of complicated PD surgery and will provide a bridge role for future robot systems.
Sung Chul Cha,Heon Joon Park,Jin Han Lee,Kwang Yool Ko,Chang Hyun Shin 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.3
The objective is to develop the complex coating technique with high quality and homogeneity of coating for spherical parts with diameter of 2 ~ 4 mm and stable mass production shall be secured with consideration of coating material, process and jig design. Silicon oxide-diamond like carbon (SiO-DLC) complex coating chemistry is expected to enhance the high temperature stability as opposed to DLC. Currently, the spherical part is first welded and then assembled with other parts, finally they are coated with DLC. However in this manner, the maximum charging in one coating batch is limited due to the very big size of the whole component which increases cost. Therefore the spherical part is to be coated before welding. Overall, reactive sputtering with high precision fixturing and masking technique resulted in the best overall properties for modern powertrain fuel system. The jig design was optimized with consideration of coating properties (height, width, thickness, inserting distance) and spherical parts were fixed at the jig with magnet plate. Coating material and process were determined with several trials. In conclusion the PVD+PACVD coated parts is developed and coatings with high quality, homogeneity and 30,000 inserting amount are secured. Coated parts are minimum 100 % more durable than non-coated parts.
Sung, Jin-Ho,Roy, Debananda,Oh, Joo-Sung,Back, Seung-Ki,Jang, Ha-Na,Kim, Seong-Heon,Seo, Yong-Chil,Kim, Jeong-Hun,Lee, Chong Bum,Han, Young-Ji Elsevier 2018 Atmospheric research Vol.203 No.-
<P><B>Abstract</B></P> <P>The percentage contribution of trans-boundary mercury (Hg) from China at different locations in South Korea was estimated from Hg anthropogenic emission distributions using the Hg dispersion model, CMAQ-Hg. This investigation quantifies the trans-boundary Hg emissions as contribution ratios. In addition, the long-range transportation frequency is also calculated, to verify inflow cases from China. The seasonal distribution of the Hg contribution ratio was found to be highest in winter (40%), followed by fall (16%). Seasonal observations of Hg inflow frequencies were estimated as 40%, 25%, 21%, and 4% in winter, fall, summer, and spring, respectively, at the same location. Such results would be produced by the wind generally blowing from the west and north-west with a speed of 5.0m/s and 4.5m/s, respectively, during winter and fall, around the study area. This study made an effort to quantify the trans-boundary Hg transport and to plot Hg anthropogenic emissions distribution in the region.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The trans-boundary Hg in Northeast Asian region was predicted by the CMAQ-Hg model using anthropogenic emission data. </LI> <LI> Amount of trans-boundary Hg was quantified between the countries as first attempt. </LI> <LI> Higher levels of trans-boundary Hg contribution from China to South Korea were recorded in winter and fall. </LI> <LI> Long-range transportation frequency and inflow cases from China to Korea were estimated by using the CMAQ-Hg model </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Graphical abstract of quantification of trans-boundary Hg in the region</P> <P>[DISPLAY OMISSION]</P>
Han Suji,Shin Hyemi,Lee Jin-Ku,Liu Zhaoqi,Rabadan Raul,Lee Jeongwu,Shin Jihye,Lee Cheolju,Yang Heekyoung,Kim Donggeon,Kim Sung Heon,Kim Jooyeon,Oh Jeong-Woo,Kong Doo-Sik,Lee Jung-Il,Seol Ho Jun,Choi J 생화학분자생물학회 2020 Experimental and molecular medicine Vol.52 No.-
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Sang-Heon Han,Seok-Beom Kang,Young-Ji Moon,Byung-Woo Moon 한국원예학회 2019 원예과학기술지 Vol.37 No.1
The purpose of this study was to investigate the characteristics of fruit growth and quality, antioxidant activity, and flavonoid content with limited irrigation after full bloom of early-maturing ‘Harye’ Satsuma mandarin (C. Unshui Marc.) in a plastic greenhouse. The results indicated a higher level of total soluble solids (TSS) content and lower fruit growth in immature fruit with limited irrigation from 30 and 60 days after full bloom, compared with the limited irrigation from 90 days after full bloom. However the fruit showed higher acidity, antioxidant activity, and flavonoid contents in the peel at fruit maturation. The results suggested that limited irrigation from before 60 days after full bloom is needed to increase TSS and antioxidant activity in the mature season in greenhouse cultivation in the early- maturing ‘Harye’ Satsuma mandarin.
Han, Yo-Han,Kee, Ji-Ye,Kim, Dae-Seung,Park, Jinbong,Jeong, Mi-Young,Mun, Jung-Geon,Park, Sung-Joo,Lee, Jong-Hyun,Um, Jae-Young,Hong, Seung-Heon The Royal Society of Chemistry 2016 Food & Function Vol.7 No.12
<P>Arctii Fructus is traditionally used in oriental pharmacies as an anti-inflammatory medicine. Although several studies have shown its anti-inflammatory effects, there have been no reports on its use in obesity related studies. In this study, the anti-obesity effect of Arctii Fructus was investigated in high-fat diet (HFD)-induced obese mice, and the effect was confirmed in white and primary cultured brown adipocytes. Arctii Fructus inhibited weight gain and reduced the mass of white adipose tissue in HFD-induced obese mice. Serum levels of triglyceride and LDL-cholesterol were reduced, and HDL-cholesterol was increased in the Arctii Fructus treated group. In 3T3-L1 cells, a water extract (WAF) and 70% EtOH extract (EtAF) of Arctii Fructus significantly inhibited adipogenesis and suppressed the expression of proliferator-activated receptor gamma and CCAAT/enhancer-binding protein alpha. In particular, EtAF activated the phosphorylation of AMP-activated protein kinase. On the other hand, uncoupling protein 1 and peroxisome proliferator-activated receptor gamma coactivator 1-alpha, known as brown adipocytes specific genes, were increased in primary cultured brown adipocytes by WAF and EtAF. This study shows that Arctii Fructus prevents the development of obesity through the inhibition of white adipocyte differentiation and activation of brown adipocyte differentiation which suggests that Arctii Fructus could be an effective therapeutic for treating or preventing obesity.</P>