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Integration of SPDT Antenna Switch With CMOS Power Amplifier and LNA for FMICW Radar Front End
Kim, Baekhyun,Jang, Jingyu,Kim, Choul-Young,Hong, Songcheol Professional Technical Group on Microwace Theory a 2018 IEEE transactions on microwave theory and techniqu Vol.66 No.11
<P>A single-pole double-throw antenna switch integrated with a CMOS power amplifier (PA) and a low-noise amplifier (LNA) by using a three-piece transmission line transformer (TLT) for a frequency-modulated interrupted continuous-wave (FMICW) radar front end is presented. The three-piece TLT consists of a PA output TL, an LNA input TL, and a TL connected to an antenna. Parallel switches and <TEX>$\lambda$</TEX>/4 effective impedance transformers are used to provide high isolation. Due to the effective integration, the chip size and overall insertion loss are reduced significantly. The measured results demonstrate that the proposed switch achieves an insertion loss of 2.2 (2.6) dB with an isolation of 33 (33.4) dB in the antenna-to-LNA input (PA output to antenna) direction. The chip, including the PA, LNA, and switch, for a 79-GHz FMICW radar front end is fabricated in 65-nm CMOS technology, and its size is 0.394 mm<SUP>2</SUP>. The PA output power is 10.2 dBm at 79 GHz, and the LNA gain is 15 dB at 79 GHz. FMICW radar waveforms are successfully generated with the switch in this chip. The measured results verify that the proposed device generates an FMICW radar waveform at the switching frequency at 6 kHz.</P>
金白鉉(Kim, Baekhyun) 한국도교문화학회 2017 道敎文化硏究 Vol.47 No.-
There are some kinship between Chinese Daoist notion and Korean Sun-gyo notion, i.e., korean traditional Daoist notion. In this paper, I will examine the kinship between the ancient Dong-yi’s cultural tradition and Korean cultural tradition on the basis of Shen-xian thought, i.e., Daoist immortal thought. But, on the birthplace of Shen-xian notion, there are various assertions and until be under controversy among scholars. So called Dong-yi, we can distinguish it by broad and narrow sense. In the broad sense, it covers ancient Dong-yi bribes who live in the northeastern Manchuria, Heilong liver’s area and the Korean peninsula. In the narrow sense, it includes Dong-yi tribes who reside in Shan-dong area, eastern He-nan area, Yangzi and Huai rivers area, and the Han liver area. I claim that the birthplace of Shen-xian notion was originated from Dong-yi’s of the broad sense basically. The core notions of Shen-xian is notions for soaring sky and immortal body. The notions of Xian-ren who does Sleeve dancing and soar in the sky certainly originated from ancient Dong-yi cultures. So in the Warring states period, it is a reasonable assertion that thoughts of Shen-xian’ schools was rooted in the state Yan and state Qi areas. Shaman in the ancient Dong-yi tribes was expert on soaring sky and their notion of flying in the sky has to do with Bird totem. Therefore, I can draw a conclusion that thought of Shen-xian surely originated from Bird totem of ancient Dong-yi trabes. Korean culture is inherently shamanic culture and faith of Shen-xian, i.e., daoistic immortal man. Many centuries later, Choe Chi-Weon(A.D.857 ~unknown), who was a famous scholar in Silla period (about the late 9th century in three kingdom era of ancient Korea), also specified the Dao of ‘Hyun-Myo (Xuan-Miao)’, ‘Pung-Lyu do’(Dao of Feng-liu), spirit of ‘Hwa-Rang do’, which is that Silla’s chivalry members was trained the discipline. Choe’s Xian-Jiao concepts also was originated from this ancient Dong-yi’s Xian-Jiao culture, i.e., ancient Korean shamanism. We also could know the notion of ‘Sam-Shin San (a mountain that three immortal beings live in) from this notion. At that time, a number of Shin-Sun (Daoist immortal man) live in and many kind of elixir plants grow in the Korean peninsula. From this facts, we come to know that Silla area was just Sun-Hyang (Xian-Xiang, 仙鄉) that Shin-Suns live in and elixir plants grow in. From this conclusion, I also can say that the first Korean wave affected on the ancient chinese Yan and Qi’s culture.
Cho, Baekhyun,Choi, Geunwon,Uruno, Yumi,Kim, Hyunseo,Chung, Jaewon,Kim, Hyojun,Lee, Kihyun Elsevier 2017 Applied Thermal Engineering Vol.113 No.-
<P><B>Abstract</B></P> <P>An attemperator is a device that is used to spray water into the superheated steam between the primary, platen, and final superheaters and the reheat lines. The goal of the attemperator is to control the temperature of the superheated steam in accordance with desired turbine-inlet temperature during both steady-state and transient operation. Because the thermowell installed at the attemperator outlet is tied back to the feedback control of the spray water, the spray water should evaporate ahead of the thermowell for accurate control of the steam temperature. In this work, the completion of the evaporation ahead of the thermowell was analyzed using the enthalpy balance from the start-up commissioning data of an 800-MW coal-fired steam power plant. In addition, the phenomena of the spray atomization and its concurrent evaporation in an attemperator were physically modeled, and a simple one-dimensional simulation was conducted to verify the analysis of the commissioning data.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An attemperator is a device to spray water into the superheated steam. </LI> <LI> The evaporation was analyzed using the enthalpy balance from the commissioning data. </LI> <LI> The spray atomization and its concurrent evaporation in an attemperator were physically modeled. </LI> <LI> A simple one-dimensional simulation was conducted to verify the commissioning results. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
김도훈(Dohoon Kim),김백현(Baekhyun Kim),전홍규(Hong-Kyu Jeon),원종운(Jong-Un Won) 한국정보기술학회 2021 한국정보기술학회논문지 Vol.19 No.12
In the current railway trade, the customs clearance process and the composition of related consultative bodies are limited to the form of agreements between countries. This is a very important process from a regulatory/institutional point of view to improve the rail trade process according to multilateral interests. However, a non-stop customs clearance system with guaranteed reliability between countries is required to quickly deliver numerous railroad logistics. Therefore, this paper intends to propose a method of interoperating and interlocking with the existing customs clearance system while applying blockchain technology to this purpose. In addition, based on the existing customs clearance system, the blockchain network is configured in an overlay form, and various non-stop scenarios and response procedures are presented. In the end, this non-stop customs clearance system between countries based on highly reliable distributed networking is a very necessary element technology to reduce time and cost in rail trade.
79-GHz Digital Attenuator-Based Variable-Gain Vector-Sum Phase Shifter With High Linearity
Jang, Jingyu,Kim, Baekhyun,Kim, Choul-Young,Hong, Songcheol THE INSTITUTE OF ELECTRICAL ENGINEERS 2018 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS Vol.28 No.8
<P>A 79-GHz variable-gain vector-sum phase shifter is presented, which consists of 5-bit digital attenuators in respective I and Q paths. It is designed to represent any vectors in the entire IQ plane by controlling the digital attenuators with low phase variations. Variable-gain function can be achieved intrinsically without additional variable-gain circuits. The proposed phase shifter can maintain low phase error at high input powers. The phase shifter provides a root mean square (RMS) phase error of 6.74° with a phase resolution of 11.25°. The gain dynamic range and resolution are 21 and 3 dB, respectively, with an RMS gain error of 1.89 dB.</P>