Epitaxial Growth-Induced Junction Welding for Silver Nanowire Network Electrodes

강형석,송솔지,김정구,조정호 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.1

고려 전기 공신당(功臣堂)의 설치와 운영 -벽상공신(壁上功臣) 제도와 관련하여-

강형석 한국중세사학회 2021 한국중세사연구 Vol.- No.67

This paper reviewed the operation of Gongshindang (Meritorious Retainers Shrine) and Byeoksang (Wall-portrait) Gongshin (Meritorious Retainers) system during the early Goryeo Dynasty. ‘Byeoksang’ was an especial and respectful treatment granted only to those vassals who had made a great contribution for the royal family and the national survival. King Taejo established Gongshindang, a shrine for meritorious retainers in the 23rd year of his reign (A.D. 940) and posted portraits of Samhan Gongshin (meritorious retainers around the country) on the wall, and then, implemented Mucha (no discrimination) Convention each year. Here, the Samhan Gongshin figures whose portraits were posted on the wall of Gongshindang were called Samhan Byeoksang Gongshin. Their qualification depended whether being granted a Gongshin name related to the ‘Byeoksang’. As such, those who are found of the title of ‘Byeoksang’ are presumed to be the object of Byeoksang as in ‘Samhan Byeoksang Gongshin’ or ‘Byeoksang Gongshin’. King Hyeonjong reintroduced the Byeoksang Gongshin system of King Taejo era conferring Samhan Hu (‘later’) Byeoksang Gongshin on the meritorious retainers of the War against Georan. King Hyeonjong granted the Gongshin titles of Samhan and Byeoksang which so far had been allowed to meritorious retainers of Taejo’s only to those of his own. And then, the Samhan Hu Gongshin system continued until the end of Goryeo Dynasty. The location of Gongshindang had changed as well after King Hyeonjong. It was moved to Mireuk-sa from Shinheung-sa at the era of King Taejo. Byeoksang Gongshin System of Goryeo has two aspects of Goryeo’s own. Firstly, it was established at a temple, which utilized the attributes of a temple – its public function, its traditional role as the space for ancestral rites and its aspect as an open space. Secondly, they performed a Mucha Convention each year at Gongshindang. This was intending to parade the majesty as King of Jeonryunseonwang (Chakravartin) as well as to visualize the reward for loyalty. The aspects and meaning of Goryeo’s own that were established in the era of King Taejo continued to the era of King Hyeonjong. King Hyeonjong intended to weigh his accomplishments against King Taejo’s by conferring Samhan Hu Byeoksang Gongshin to those meritorious retainers of his when he won a victory at the War against Georan. These endeavors seemed to be successful considering that King Hyeonjong was evaluated as ‘Jungheungjiju’ (King of Revitalization) and ‘Samhanjaejo’ (Re-established Samhan).

Optimization of a 3-D Thermally Asymmetric Rectangular Fin

강형석,Gang, Hyeong-Seok 대한기계학회 2001 KSME International Journal Vol.15 No.11

The non-dimensional fin length for optimum heat loss from a thermally asymmetric rectangular fin is represented as a function of the ratio of the bottom surface Biot number to the top surface Biot number, fin tip surface Biot number and the non-dimensional fin width. Optimum heat loss is taken as 98% of the maximum heat loss. For this analysis, three dimensional separation of variables method is used. Also, the relation between the ratio of the bottom surface Biot number to the top surface Biot number and the ratio of the right surface Biot number to the left surface Biot number is presented.

Smart Manufacturing: Past Research, Present Findings, and Future Directions

강형석,노상도,이주연,최상수,김현,박준희,선지연,김보현 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.3 No.1

Today, the manufacturing industry is aiming to improve competitiveness through the convergence with cutting-edge ICT technologies in order to secure a new growth engine. Smart Manufacturing, which is the fourth revolution in the manufacturing industry and is also considered as a new paradigm, is the collection of cutting-edge technologies that support effective and accurate engineering decision-making in real time through the introduction of various ICT technologies and the convergence with the existing manufacturing technologies. This paper surveyed and analyzed various articles related to Smart Manufacturing, identified the past and present levels, and predicted the future. For these purposes, 1) the major key technologies related to Smart Manufacturing were identified through the analysis of the policies and technology roadmaps of Germany, the U.S., and Korea that have government-driven leading movements for Smart Manufacturing, 2) the related articles on the overall Smart Manufacturing concept, the key system structure, or each key technology were investigated, and, finally, 3) the Smart Manufacturing-related trends were identified and the future was predicted by conducting various analyses on the application areas and technology development levels that have been addressed in each article.

APR1400 IRWST Pool 온도분포 해석 ( A Numerical Study on the IRWST Pool Temperature Distributionin in APR1400 )

강형석,배윤영,박종균 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.1 No.4

Junction Welding Techniques for Metal Nanowire Network Electrodes

강형석,이기라,김영준,조정호 한국고분자학회 2018 Macromolecular Research Vol.26 No.12

Transparent conductive electrodes (TCEs), which offer advantages of high electrical conductivity and optical transparency, are essential components of practical high-tech optoelectronics such as touch panels, e-papers, organic light-emitting diodes, and solar cells. Solution-processed Ag nanowires (AgNWs) have been considered as a practical alternative TCE material suitable for industrial-scale mass production. However, the contact resistance at AgNW junctions strongly affects the total sheet resistance of AgNW electrodes. In recent years, various welding techniques for AgNW network electrodes have been developed with the aim of decreasing their sheet resistance while maintaining their optical transmittance. In this paper, we present a review of various welding methods such as thermal-mechanical welding, light welding, chemical welding, and metal-plating welding.

Optimization of geometrically asymmetric straight trapezoidal fins

강형석 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12

Geometrically asymmetric trapezoidal fins with variable slope of fin’s top surface are optimized for fixed fin volumes. Convectionfrom the inside fluid to the inside wall, conduction from the inside wall to the fin base and conduction through the fin base are consideredsimultaneously for the fin base boundary condition. For fixed fin volumes, the optimum heat loss, the corresponding optimum fin length,and fin base height are presented as functions of the fin base thickness, inside fluid convection characteristic number, fin volume, finshape factor, and ambient convection characteristic number. The optimum values between 1-D and 2-D analyses are compared. One ofthe results shows that both the optimum fin length and fin base height decrease with the increase of the fin shape factor.

합성가스로부터 수소 및 이산화탄소 추출(PSA) 기술

강형석 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.-

Embedded silver nanowires transparent conductive electrode for organic light-emitting diodes

강형석,강일중,조정호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

Embedded silver nanowires (AgNWs) transparent conductive electrode (TCE) has been demonstrated for various applications such as organic field-effect transistors (OFETs), solar cells, organic light-emitting diodes (OLEDs), etc. Here we present fabrication of AgNWs embedded TCE which also is possible to pattern simultaneously with photolithography system. AgNWs embedded in SU-8, epoxy polymer, which is photo curable. RMS roughness of AgNWs-TCE is below than 1.6nm. Mechanical stability is excellent for bending. Embedded TCE has strong adhesion in a test of 3M scotch tape detachment test. We also fabricated patterned OLED with our AgNWs TCE. Performance of AgNWs OLED is similar with Indium tin oxide (ITO) electrode based OLED. Mechanical stability is promising for long term cycle test. This work present simp licity of AgNWs TCE process of high quality of TCEs and is available for future transparent and wearable device in the industries.

속이 빈 원관에서 1차원적인 열전달 해석의 오차

강형석,Gang, Hyeong-Seok 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2

A comparison is made of the heat loss from a hollow cylinder, computed using an one-dimensional analytic method and a two-dimensional separation of variables scheme. For a two-dimensional analysis, the temperature of the inner surface as a boundary condition can be varied along the length of the cylinder by varing the temperature variation factor, b. Comparisons of the heat loss from the hollow cylinder using these two methods are given as a function of non-dimensional cylinder length, the ratio of the outer radius to the inner radius, temperature variation factor and Biot number. The result shows that the value of the heat loss from the hollow cylinder obtained using the one-dimensional analytic method becomes close to the value given by the two-dimensional separation of variables scheme as the value of Biot number and the non-dimensional hollow cylinder length increase and as the ratio of the outer radius to the inner radius decreases.