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Inseok Jang,Jun-Ho La,Gyu-Tae Kim,Jeong-Soon Lee,Eun-Jin Kim,Eun-Shin Lee,Su-Jeong Kim,Jeong-Min Seo,Sang-Ho Ahn,Jae-Yong Park,Seong-Geun Hong,Dawon Kang,Jaehee Han 대한생리학회-대한약리학회 2008 The Korean Journal of Physiology & Pharmacology Vol.12 No.5
Single-channel recordings of TASK-1 and TASK-3, members of two-pore domain K<sup>+</sup> channel family, have not yet been reported in dorsal root ganglion (DRG) neurons, even though their mRNA and activity in whole-cell currents have been detected in these neurons. Here, we report single-channel kinetics of the TASK-3-like K<sup>+</sup> channel in DRG neurons and up-regulation of TASK-3 mRNA expression in tissues isolated from animals with spinal cord injury (SCI). In DRG neurons, the single-channel conductance of TASK-3-like K<sup>+</sup> channel was 33.0±0.1 pS at −60 mV, and TASK-3 activity fell by 65±5% when the extracellular pH was changed from 7.3 to 6.3, indicating that the DRG K<sup>+</sup> channel is similar to cloned TASK-3 channel. TASK-3 mRNA and protein levels in brain, spinal cord, and DRG were significantly higher in injured animals than in sham-operated ones. These results indicate that TASK-3 channels are expressed and functional in DRG neurons and the expression level is up-regulated following SCI, and suggest that TASK-3 channel could act as a potential background K<sup>+</sup> channel under SCI-induced acidic condition.
Jang, Inseok,Song, Kyungho,Oh, Seong-Geun Chemical Society of Japan 2012 Chemistry letters Vol.41 No.2
<P>Echinoid-like TiO<SUB>2</SUB> particles were prepared via modified sol–gel process using PVA as a surface-directing agent in acetic acid solution. The surface of echinoid-like TiO<SUB>2</SUB> particle is significantly rough, and the size of the particles is 800–1100 nm. The specific surface area and average pore size of echinoid-like TiO<SUB>2</SUB> particles are 82.81 m<SUP>2</SUP> g<SUP>−1</SUP> and 11.79 nm, respectively. The photocatalytic activity of echinoid-like TiO<SUB>2</SUB> particles was very high compared with P25 due to larger surface area.</P>
Jang, Inseok,Song, Kyungho,Park, Jun-Hwan,Oh, Seong-Geun Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
To enhance the power conversion efficiency of dye-sensitized solar cell (DSSC), the surface of titanium dioxide ($TiO_2$) photoelectrode was modified by hydroxylation treatment with $NH_4OH$ solution at $70^{\circ}C$ for 6 h. The $NH_4OH$ solutions of various concentrations were used to introduce the hydroxyl groups on $TiO_2$ surface. As the concentration of $NH_4OH$ was increased, the short-circuit current density ($J_{SC}$) value and conversion efficiency of solar cells were increased because the amount of adsorbed dye molecules on $TiO_2$ surface was increased. As a result of the surface modification to introduce hydroxyl groups, the concentration of adsorbed dye on the $TiO_2$ surface could be improved up to 32.61% without the changes of morphology, surface area and pore volume of particles. The morphology, the specific surface area, the pore volume and the chemical states of $TiO_2$ surface were characterized by using FE-SEM, $N_2$ adsorption-desorption isotherms and XPS measurements. The amount of adsorbed dye and the performance of fabricated cells were analyzed by using UV-Vis absorption spectroscopy and solar simulator.
Jang, Inseok,Shin, Kyung-Ho,Yang, Il,Kim, Hyeon,Kim, Juseong,Kim, Wan-Ho,Jeon, Sie-Wook,Kim, Jae-Pil Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.518 No.-
<P><B>Abstract</B></P> <P>The thermal conductivity of boron nitride/epoxy composite was increased by up to 45.4% through surface modification of BN. The silane coupling agents with different main carbon chain (C3 and C16) were introduced on the BN surface through sol-gel reaction to improve the affinity of BN with epoxy resin. The surface-modified BN exhibits the higher dispersibility in epoxy than as-prepared BN. In the case of the modified BN samples, the dispersion was more stable as increasing the length of carbon main chain of silane. It means that the higher interfacial adhesion of BN/epoxy composite could be obtained by introducing the longer carbon chain on BN surface. Using the surface modification, the thermal conductivity of the treated BN with HDTMS reached to 3.49W/mK through decrease of the thermal contact resistance at the BN/epoxy interface. As a result, the enhancement of thermal conductivity could be controlled by varying the surface property of BN.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The surface of Boron nitride (BN) was modified with different silanes in order to control the BN surface property. </LI> <LI> The affinity of BN with epoxy resin was effectively improved as increasing the carbon chain length of silane, resulting in the increment of adhesion BN/epoxy. </LI> <LI> The enhancement of thermal conductivity of BN/epoxy composite could be successfully achieved by decreasing the thermal contact resistance at the BN/epoxy interface. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic illustration for the mechanism of surface modification of BN with silane.</P> <P>[DISPLAY OMISSION]</P>
Jang, Inseok,Kim, Juseong,Kim, Hyeon,Kim, Wan-Ho,Jeon, Sie-Wook,Kim, Jae-Pil Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.520 No.-
<P><B>Abstract</B></P> <P>The water resistance and photo-efficiency of K<SUB>2</SUB>SiF<SUB>6</SUB>:Mn<SUP>4+</SUP> phosphor (KSF) was improved without sacrificing the optical properties through plasma treatment. Hexadecyltrimethocysilane, having a main carbon chain (C<SUB>16</SUB>), was introduced on the surface of KSF for the hydrophobic modification. After the treatment, the water contact angle dramatically raised from 6.6 to 122.5°, indicating the reinforcement of waterproof property. Moreover, the optical properties of phosphor were improved due to the increment of light absorption and reduction of hydroxyl quenching effect. The high photometric flux could be achieved in LED device fabricated with modified KSF, which is about 12.8% higher than reference device. It is contributed to the improvement of dispersibility of phosphor by enhancing the affinity between phosphor and encapsulant.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The dry-type surface modification was performed on water-vulnerable phosphor (K<SUB>2</SUB>SiF<SUB>6</SUB>:Mn<SUP>4+</SUP>). </LI> <LI> After the treatment, the water contact angle dramatically raised from 6.6 to 122.5°, indicating the reinforcement of waterproof property. </LI> <LI> The optical nature of phosphor was increased due to enhancement of light absorption and suppression of quenching effect. </LI> <LI> The enhancement of photo-performance of LED device could be successfully achieved by improving the dispersibility of phosphor in encapsulant. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>K<SUB>2</SUB>SiF<SUB>6</SUB>:Mn<SUP>4+</SUP> phosphor with a high water-resistance property.</P> <P>[DISPLAY OMISSION]</P>
동축선로를 이용한 휴대 지상파 UHF TV 수신용 슬리브 안테나 설계
장인석(Jang Inseok),손태호(Son Taeho),박영태(Park Youngtae) 한국산학기술학회 2005 한국산학기술학회 학술대회 Vol.- No.-
본 논문에서는 지상파 UHF 휴대용 슬리브 안테나를 설계 제작하였다. 이 안테나는 차량 네비게이션장치에 들어가는 지상파 UHF TV 수신을 위한 안테나이다. 기존 모노폴 형태가 갖는 단점을 제거하고 성능 향상을 위해 세트 external 안테나로, 필요시에 목걸이형으로 부착이 가능한 구조를 가지고 있다. 동축선을 이용하여 슬리브 다이폴 안테나로 설계함으로써 안테나 입장에서 볼 때 접지가 부족한 문제를 해결하였다. 제작 측정한 결과 UHF 대역에서 VSWR 2:1 이하의 특성을 만족하였다.
5.8GHz ISM밴드용 평행 결합선로 대역통과 여파기의 설계
장인석(Jang Inseok),손태호(Son Taeho) 한국산학기술학회 2006 한국산학기술학회 학술대회 Vol.- No.-
본 논문에서는 5.8Ghz ISM대역 평행 결합선로 대역통과 여파기를 설계 제작하였다. 긴본적인 설계는 저역통과 여파기에서 대역통과 여파기로 변환한 후, 직·병렬 공진기를 이용한 설계와 J-인버터를 이용해 평행 결합선로 대역통과 여파기를 구현하였다. 2개의 공진 주파수를 실제로 구현하기 어렵기 때문에 하나의 공진기만을 사용하기 위해 인버터를 사용하였다. 또한 실제적인 마이크로스트립 라인의 layout크기를 결정하기 위해 우수·기수 모드 임피던스를 해석하고 근사식을 통해 스트립라인의 치수를 결정하였다. 이런 과정을 토대로 5.8GHz ISM밴드용 평행 결합선로 대역통과 여파기를 설계, 제작하였다.
Construction and calibration of a large-area heat flow meter apparatus
Yang, Inseok,Kim, Daeho,Lee, Sanghyun,Jang, Hyunmin Elsevier Sequoia S.A 2019 Energy and buildings Vol.203 No.-
<P><B>Abstract</B></P> <P>A large-area heat flow meter apparatus that can measure the thermal conductivity of a 900 mm × 900 mm insulating specimen was constructed in this work with a relative expanded uncertainty of 1.4%. By the use of a reference material certified with an assigned value of thermal conductivity, the heat flux transducers in the apparatus were calibrated in the mean temperature range of −10 °C to +50 °C. The following three tests on the robustness of measurement results were conducted: (1) assessment of the reproducibility upon reloading the specimen a few times into the apparatus, (2) use of various temperature differences on the two surfaces of the specimen, and (3) configuration of the vertical temperature profile around the specimen differently while maintaining the temperatures on the specimen surface and their difference the same. The results of the three robustness tests supported that the measurements were consistent and the uncertainty assessment for the thermal conductivity measurement using the constructed heat flow meter apparatus was valid.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A heat flow meter apparatus for a 900 mm × 900 mm insulation specimen was constructed. </LI> <LI> The apparatus was calibrated using a certified material from −10 °C to +50 °C. </LI> <LI> The thermal conductivity measurement was tested to be reproducible and robust. </LI> <LI> The expanded uncertainty of the thermal conductivity measurement was 1.4%. </LI> </UL> </P>
A Design Framework of FlexRay Network Parameter Optimization
Kwanghyun Jang,Inseok Park,Jaehyun Han,Myoungho Sunwoo,Eunjin Lee 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In designing a FlexRay network, more than 70 configuration parameters are involved. Since these parameters are numerous and correlated to each other, FlexRay network design is complex and difficult work. Unfortunately, there are few systematic processes that help determining the FlexRay network parameters optimally. In this study, we propose a design framework that optimizes the FlexRay network parameters. We consider two main parameters that are highly relevant to the application algorithm: static (ST) slot length and communication cycle (CC) length. The design process is composed of two steps. In the first step, the ST slot length is optimized considering the frame packing algorithm. This frame packing algorithm binds network signals into ST frames in consideration of the periods and signal groups. In the second step, the CC length is optimized with regard to the worst case response times (WCRT) of ST and dynamic (DYN) frames. The WCRTs are analyzed based on the frame scheduling algorithm. The proposed design framework is applied in a case study.