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Song, Gyeong Ju,Kim, Kyung-Bum,Cho, Jae Yong,Woo, Min Sik,Ahn, Jung Hwan,Eom, Jong Hyuk,Ko, Sung Min,Yang, Chan Ho,Hong, Seong Do,Jeong, Se Yeong,Hwang, Won Seop,Woo, Sang Bum,Jhun, Jeong Pil,Jeon, De Elsevier 2019 APPLIED ENERGY Vol.247 No.-
<P><B>Abstract</B></P> <P>We propose a piezoelectric energy harvesting technology installed in a roadway speed bump. We have installed a module that can charge mobile phones utilizing a speed bump piezoelectric harvester (SBPH), which is easy to apply to roads. A highly integrated module with 40 piezo-generators was fixed and installed at the center of the speed bump. When a medium-sized vehicle passed the module at a speed of 30 km/h, an output voltage of 144 V<SUB>max</SUB>, output current of 45.2 mA<SUB>max</SUB>, and output power of 4086.08 mW<SUB>max</SUB> (6.81 W/m<SUP>2</SUP>) were measured at a load resistance of 2 kΩ. When the vehicle passed over the SBPH nine times, it charged a capacitor (10,000 μF) to provide 6 V for about 200 s, and the charged electrical energy was enough to operate a cellphone. The self-controlled battery charging system via electricity generated by the piezoelectric module could be applied to a speed bump installed on an actual road.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The harvester was installed in common speed bump on an actual road. </LI> <LI> The harvesting module produces 4086.08 mW<SUB>max</SUB> and 6.81 W/m<SUP>2</SUP>. </LI> <LI> The harvester successfully charged a mobile phone without external energy source. </LI> <LI> These technologies can improve self-controlled charging system on actual road. </LI> </UL> </P>
Development of a pavement block piezoelectric energy harvester for self-powered walkway applications
Song, Gyeong Ju,Cho, Jae Yong,Kim, Kyung-Bum,Ahn, Jung Hwan,Song, Yewon,Hwang, Wonseop,Hong, Seong Do,Sung, Tae Hyun Elsevier 2019 APPLIED ENERGY Vol.256 No.-
<P><B>Abstract</B></P> <P>We propose a pavement block piezoelectric energy harvester (PBPEH) that can be installed in an actual walkway. We developed an Internet of Things (IoT) system that can power the walkway signal indicator (delineator) and also collect environmental data (such as humidity and temperature) near the walkway utilizing the PBPEH, without a battery. A highly integrated module with 24 piezoelectric devices were fixed inside the PBPEH. Under maximum weight condition, that is, in case of a person weighing 100 kg passing over the module, an output voltage of 38.52 V<SUB>max</SUB>, current of 3.85 mA<SUB>max</SUB>, and power of 148.3 mW<SUB>max</SUB> (3.7 W/m<SUP>2</SUP>) were generated at a load resistance of 10 kΩ. Energy storage test as applied to realistic conditions, that is, when a 60 kg person (average weight condition) passes over the module 10 times it charged a capacitor (1000 μF) to 55.6 mJ. As a result, it successfully turned on a delineator installed on an actual walkway after 4.8 s and powered the IoT sensor system without an external energy source.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The harvester was installed in common pavement block on an actual walkway. </LI> <LI> The harvesting module produces 148.3 mW<SUB>max</SUB> and 3.7 W/m<SUP>2</SUP>. </LI> <LI> The harvester successfully powered a wireless sensor network and a walkway indicator. </LI> <LI> This technology can improve an Internet of Things (IoT) infrastructure on actual walkway. </LI> </UL> </P>
송주경(Song Ju-gyeong) 한국어문교육학회 2005 어문학교육 Vol.30 No.-
Jeong Chae-bong is remembered as a fairy tale writer that contributed to the establishment of the high status of the Korean children's literature through his marvelous works of great artistic values. Until he passed on due to his chronic disease in 2001, he continued writing stories for children battling cancer ferociously, which proves how passionate he was about children's stories body and soul. His works too prove that he poured a great amount endeavor to express the world of innocent and beautiful children's mind in his stories. He offered the chance for the modern people to realize the importance of life and nature in the worldly and material society through a harmony between his lyrical and succinct sentences and fantasy. The purpose of this study was to investigate the internal characteristics of his fairy tales by analyzing his works in terms of theme. The scope was limited to 100 short fairy tales that were judged to fit elementary school students. The basic beginning stage, Chapter II reviewed his birth, growing, activities, and consciousness as a writer. The data revealed that his literature started from 'children's mind,' The major discussions and findings of Chapter III were as follows: the themes of his fairy tales included virtues of love and mercy, realization of children's mind, reorganization of legends and historical mind, interest in the separation and unification of two Koreas, and critical depiction of absurd situations. The theme of virtue of love and mercy was presented by the characters that overcame given situations with love for mankind or realized love through sacrifices. The children's mind was suggested as a practical means to lead a truthful and sincere life.
Rapid HPLC determination of gastrodin in Gastrodiae Rhizoma
Lee, Ju-Gyeong,Moon, Sung-Ok,Kim, Se-Yong,Yang, Eun-Ju,Min, Ju-Sik,An, Ju-Hee,Choi, Eun-A,Liu, Kwang-Hyeon,Park, Eun Ji,Lee, Hwa-Dong,Song, Kyung-Sik 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.3
Gastrodin is a major biologically active ingredient in members of the genus Gastrodia. For this reason, there are many reports on the quantification of gastrodin in Gastrodiae Rhizoma (GR) and in GR-containing herbal preparations. HPLC, HPLC-MS, and TLC are the major approaches for gastrodin quantification; however, they usually require complicated pre-treatment, lengthy analysis, and expensive instruments. Therefore, a rapid and reliable method for determining gastrodin in GR is necessary. Optimal HPLC separation was achieved using a Chromolith Performance RP-18e ($4.8{\times}100mm$, $5{\mu}m$) stationary phase. The optimal mobile phase was a mixture of water (A) and acetonitrile (B) with a gradient of 1 % B at 0-8 min, 20 % B at 8-10 min, 80-100 % B at 10-12 min, and 100 % B at 12-13 min, followed by equilibration with 1 % B for 2 min at a flow rate of 1.5 mL/min. The detection wavelength was UV220 nm. Gastrodin appeared within 4 min under the above conditions. The calibration curve of gastrodin showed good linearity in the 0.25-10.0 range ($r^2=0.9998$). The limit of detection ($0.13{\mu}g$), limit of quantification ($0.25{\mu}g$), and reproducibilities of area and retention time (0.04 and 3.24 %, respectively) were within acceptable ranges. In addition, the intra-day precision and accuracy of gastrodin were 0.74 and $100.63{\pm}0.04%$, respectively, while the inter-day precision and accuracy were 0.06 and $99.25{\pm}0.05%$, respectively. The range of mean gastrodin content in six GR samples, which were cultivated at different sites, was 0.37-0.79 %. This result may be a guideline for the quality control of GR and GR-containing medicinal preparations.
송경주 ( Gyeong-ju Song ),강예준 ( Ye-june Kang ),장경배 ( Kyung-bae Jang ),서화정 ( Hwa-jeong Seo ) 한국정보처리학회 2021 한국정보처리학회 학술대회논문집 Vol.28 No.1
현재, 주요 선진국들을 포함하여 Google과 IBM과 같은 국제 대기업들을 필두로 양자 컴퓨터 개발에 전폭적인 투자들을 하고 있다. 양자 컴퓨터는 특정 분야에 있어 월등한 계산 능력을 보여주며, 기존 컴퓨터에서는 해결할 수 없던 몇몇 문제들을 빠른 시간 내에 해결한다. 이러한 양자 컴퓨터의 등장은 기존 컴퓨터에서는 사실상 풀 수 없는 암호 알고리즘들을 빠른 시간 내에 해결하여 암호학계에 큰 위협이 되고 있다. 현재 사용하고 있는 대부분의 공개키 암호 알고리즘인 RSA와 ECC(Elliptic Curve Cryptography) 또한 공격 대상이다. NIST에서는 다가오는 양자 컴퓨터 시대에 대비하여 양자내성암호 공모전을 주최하였으며 현재 라운드 3에 도입하였다. 본 논문에서는 라운드 3의 후보 알고리즘인 코드기반암호를 공격하는 ISD(Information Set Decoding) 알고리즘에 관한 동향을 조사하였다.
송경주 ( Gyeong-ju Song ),장경배 ( Kyung-bae Jang ),심민주 ( Min-joo Sim ),서화정 ( Hwa-jeong Seo ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2
대규모 양자컴퓨터가 등장하면 기존 암호체계가 더 이상 안전하지 않을 것이라 예상한다. 양자 알고리즘인 Grover‘s 알고리즘은 대칭키 암호에 대한 brute-force attack을 가속화 시켜 보안강도를 감소시킨다. 따라서 양자컴퓨터의 가용 자원이 암호공격에 필요한 자원에 도달했을 때, 공격 대상 암호가 깨지는 시점으로 보고 있다. 많은 선행 연구들은 암호를 양자회로로 구현하여 공격에 필요한 자원을 추정하고 암호에 대한 양자 강도를 확인하였다. 본 논문에서는 이러한 연구동기로 ARX 구조의 SIMECK 경량암호에 대한 양자회로를 처음으로 제안한다. 우리는 SIMECK 양자회로에 대한 최적의 양자회로 구현을 제시하고 각 함수의 동작을 설명한다. 마지막으로 SIMECK 양자회로에 대한 양자자원을 추정하고 SIMON 양자회로와 비교하여 평가한다.