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Park, Minwoo,Im, Jungkyun,Shin, Minkwan,Min, Yuho,Park, Jaeyoon,Cho, Heesook,Park, Soojin,Shim, Mun-Bo,Jeon, Sanghun,Chung, Dae-Young,Bae, Jihyun,Park, Jongjin,Jeong, Unyong,Kim, Kinam Nature Pub. Group 2012 Nature nanotechnology Vol.7 No.12
<P>Conductive electrodes and electric circuits that can remain active and electrically stable under large mechanical deformations are highly desirable for applications such as flexible displays, field-effect transistors, energy-related devices, smart clothing and actuators. However, high conductivity and stretchability seem to be mutually exclusive parameters. The most promising solution to this problem has been to use one-dimensional nanostructures such as carbon nanotubes and metal nanowires coated on a stretchable fabric, metal stripes with a wavy geometry, composite elastomers embedding conductive fillers and interpenetrating networks of a liquid metal and rubber. At present, the conductivity values at large strains remain too low to satisfy requirements for practical applications. Moreover, the ability to make arbitrary patterns over large areas is also desirable. Here, we introduce a conductive composite mat of silver nanoparticles and rubber fibres that allows the formation of highly stretchable circuits through a fabrication process that is compatible with any substrate and scalable for large-area applications. A silver nanoparticle precursor is absorbed in electrospun poly (styrene-block-butadiene-block-styrene) (SBS) rubber fibres and then converted into silver nanoparticles directly in the fibre mat. Percolation of the silver nanoparticles inside the fibres leads to a high bulk conductivity, which is preserved at large deformations (σ???2,200?S?cm(-1) at 100% strain for a 150-?m-thick mat). We design electric circuits directly on the electrospun fibre mat by nozzle printing, inkjet printing and spray printing of the precursor solution and fabricate a highly stretchable antenna, a strain sensor and a highly stretchable light-emitting diode as examples of applications.</P>
Jungkyun Park,Geunyoung Yeom,JongHyeuk Lim,Kyongnam Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
The characteristics of a large-size internal-type inductively coupled plasma (ICP) source having a ``double-comb-type" antenna have been investigated for the processing of a large-area flat-panel display substrate having a size of 2,300 mm × 2,000 mm, and its characteristics were compared with those for an ICP source having a ``serpentine-type" antenna. The ICP source with the ``double-comb-type" antenna showed a lower impedance, a higher plasma uniformity, and a higher plasma density compared to the ICP source with the ``serpentine-type" antenna. The measured plasma density and uniformity of the ICP source with the ``double-comb-type" antenna were higher than 8.5 × 10 10/㎤ and lower than 14%, respectively, at a 10 kW rf power and 15 mTorr of Ar. The etch uniformity of the photoresist within the substrate was about 12.5% at a 8 kW rf power and 15 mTorr Ar/O₂ (7 : 3). The characteristics of a large-size internal-type inductively coupled plasma (ICP) source having a ``double-comb-type" antenna have been investigated for the processing of a large-area flat-panel display substrate having a size of 2,300 mm × 2,000 mm, and its characteristics were compared with those for an ICP source having a ``serpentine-type" antenna. The ICP source with the ``double-comb-type" antenna showed a lower impedance, a higher plasma uniformity, and a higher plasma density compared to the ICP source with the ``serpentine-type" antenna. The measured plasma density and uniformity of the ICP source with the ``double-comb-type" antenna were higher than 8.5 × 10 10/㎤ and lower than 14%, respectively, at a 10 kW rf power and 15 mTorr of Ar. The etch uniformity of the photoresist within the substrate was about 12.5% at a 8 kW rf power and 15 mTorr Ar/O₂ (7 : 3).
Jungkyun Na,Semin Park,Hyun‑seok Ko,Hyung‑don Joo,Yangmo Koo 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
Recent interest in sustainable development increased demand for efficient transformer to reduce energy consumption. In orderto meet the high demand for efficient transformer, inefficient batch annealing manufacture for grain-oriented silicon steel,which is core material of transformer, should be improved. Therefore, novel process for achieving about 90% columnar Gossgrains without an inhibitor in continuous line, which differs from the conventional batch process, is herein described. Fe-2.0%Si–C alloys were cold rolled and subsequently partially decarburized in a wet hydrogen gas and these steps are repeatedseveral times. In this process, the sheet is divided into surface layer (α ferrite) and interior (pearlite-like structure + α ferrite). When two-layer sheet is cold rolled, {111} < 112 > is formed by concentrated shear strain and it is developed into Goss seed. During decarburization, Goss grains within surface layer grow inward as columnar grain, retaining the Goss texture of about90%. Concentrated shear strain on surface layer was formed by large difference of strength between the surface and interior. By this difference, large stored energy difference between Goss and {111} < 112 > , {411} < 148 > is acquired, and this leadto the growth of Goss grains. Driving force for forming the Goss grains is concentrated shear strain on the surface layer. Ithas been verified that this novel process has a vast potential for making grain-oriented silicon steel by continuous process.
Jungkyun Na,Semin Park,Hyun‑seok Ko,Hyung‑don Joo,Yangmo Koo 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Recent interest in sustainable development increased demand for efficient transformer to reduce energy consumption. In orderto meet the high demand for efficient transformer, inefficient batch annealing manufacture for grain-oriented silicon steel,which is core material of transformer, should be improved. Therefore, novel process for achieving about 90% columnar Gossgrains without an inhibitor in continuous line, which differs from the conventional batch process, is herein described. Fe-2.0%Si–C alloys were cold rolled and subsequently partially decarburized in a wet hydrogen gas and these steps are repeatedseveral times. In this process, the sheet is divided into surface layer (α ferrite) and interior (pearlite-like structure + α ferrite). When two-layer sheet is cold rolled, {111} < 112 > is formed by concentrated shear strain and it is developed into Goss seed. During decarburization, Goss grains within surface layer grow inward as columnar grain, retaining the Goss texture of about90%. Concentrated shear strain on surface layer was formed by large difference of strength between the surface and interior. By this difference, large stored energy difference between Goss and {111} < 112 > , {411} < 148 > is acquired, and this leadto the growth of Goss grains. Driving force for forming the Goss grains is concentrated shear strain on the surface layer. Ithas been verified that this novel process has a vast potential for making grain-oriented silicon steel by continuous process.
RhoA is associated with invasion and poor prognosis in colorectal cancer
JEONG, DONGJUN,PARK, SOYOUNG,KIM, HYUNGJOO,KIM, CHANG-JIN,AHN, TAE SUNG,BAE, SANG BYUNG,KIM, HAN JO,KIM, TAE HYUN,IM, JUNGKYUN,LEE, MOON SOO,KWON, HYOG YOUNG,BAEK, MOO JUN Spandidos Publications 2016 International journal of oncology Vol.48 No.2
<P>Colorectal cancer is one of the most common cancers and is the fourth leading cause of cancer death in Korea. Mortality of colorectal cancer is strongly associated with the metastatic spread of the disease. As such, it is important to find and characterize signaling pathways involved in colon cancer metastasis. We investigated the functional importance of RhoA using human cell lines as well as 150 colorectal cancer patient-derived samples as it remains unclear whether RhoA functions as either an oncogene or a tumor suppressor in colon cancer. RhoA was highly expressed in metastatic cancer cell lines. Although cancer cell proliferation was only moderately impaired after depletion of RhoA, RhoA-depleted cancer cells exhibited markedly reduced migration and invasion ability in vitro. Furthermore, we found that RhoA is associated with the invasion of lymph nodes and blood vessels in the patient colorectal cancer samples. Most notably, patients with higher RhoA expression had a significantly poorer 5-year survival rate after surgery. These results suggest that RhoA is a marker of poor prognosis in colorectal cancer and may be a promising target for cancer treatment.</P>
Imaging the Completely Buried Anomaly using a Small-ship Three-dimensional Seismic Survey System
Kim, Wonsik,Shin, Jungkyun,Kim, Hyundo,Yi, Bo-Yeon,Park, Chanho,Kim, Chansu,Seo, Gabseok,Cho, Dongwoo,Jung, Yonghwa,Lee, Ho-Young,Kang, Dong-Hyo BioOne (Coastal Education and Research Foundation) 2018 JOURNAL OF COASTAL RESEARCH Vol.85 No.special