X-ray 이미지 센서용 싱글 픽셀 포톤 카운터 설계

백승면,김태호,강형근,전성채,진승오,허영,하판봉,박무훈,김영희,Baek, Seung-Myun,Kim, Tae-Ho,Kang, Hyung-Geun,Jeon, Sung-Chae,Jin, Seung-Oh,Huh, Young,Ha, Pan-Bong,Park, Mu-Hun,Kim, Young-Hee 한국정보통신학회 2007 한국정보통신학회논문지 Vol.11 No.2

본 논문에서는 디지털 의료 영상 및 진단 분야 그리고 산업용으로도 활용 가능한 싱글 포톤 계수형 영상센서를 $0.18{\mu}m$ triple-well CMOS(Complementary Metal Oxide Semiconductor) 공정을 사용하여 설계하였다. 설계된 Readout 칩용 싱글 픽셀은 디지털 X-ray 이미지 센서모듈을 간단화 하기 위해 단일 전원전압을 사용하였으며, Preamplifier의 출력 전압인 signal voltage(${\Delta}Vs$)를 크게 하기 위해 Folded Cascode CMOS OP amp를 이용한 Preamplifier를 설계하였으며, 기존의 Readout 칩 외부에서 인가하던 threshold voltage를 Readout 칩 내부에서 생성해 줄 수 있도록 Externally Tunable Threshold Voltage Generator 회로를 새롭게 제안하였다. 그리고, Photo Diode에서 발생하는 Dark Current Noise를 제거하기 위한 Dark Current Compensation 회로를 제안하였으며, 고속 counting이 가능하고, layout 면적이 작은 15bit LFSR(Linear Feedback Shift Resister) Counter를 설계하였다. A single pixel photon counting type image sensor which is applicable for medical diagnosis with digitally obtained image and industrial purpose has been designed with $0.18{\mu}m$ triple-well CMOS process. The designed single pixel for readout chip is able to be operated by single supply voltage to simplify digital X-ray image sensor module and a preamplifier which is consist of folded cascode CMOS operational amplifier has been designed to enlarge signal voltage(${\Delta}Vs$), the output voltage of preamplifier. And an externally tunable threshold voltage generator circuit which generates threshold voltage in the readout chip has been newly proposed against the conventional external threshold voltage supply. In addition, A dark current compensation circuit for reducing dark current noise from photo diode is proposed and 15bit LFSR(Linear Feedback Shift Resister) Counter which is able to have high counting frequency and small layout area is designed.

UHF RFID 태그 칩용 저전력 EEPROM설계

이원재,이재형,박경환,이정환,임규호,강형근,고봉진,박무훈,하판봉,김영희,Yi, Won-Jae,Lee, Jae-Hyung,Park, Kyung-Hwan,Lee, Jung-Hwan,Lim, Gyu-Ho,Kang, Hyung-Geun,Ko, Bong-Jin,Park, Mu-Hun,Ha, Pan-Bong,Kim, Young-Hee 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.3

본 논문에서 는 플래쉬 셀을 사용하여 수동형 UHF RFID 태그 칩에 사용되는 저전력 1Kb 동기식 EEPROM을 설계하였다. 저전력 EEPROM을 구현하기 위한 방법으로 다음과 같은 4가지 방법을 제안하였다. 첫째, VDD(=1.5V)와 VDDP(=2.5V)의 이중 전원 공급전압 방식을 사용하였고, 둘째, 동기식 회로 설계에서 클럭(clock) 신호가 계속 클럭킹(clocking)으로 인한 스위칭 전류(switching current)가 흐르는 것을 막기 위해 CKE(Clock Enable) 신호를 사용하였다. 셋째, 읽기 사이클에서 전류 센싱(current sensing) 방식 대신 저전력 소모를 갖는 clocked inverter를 사용한 센싱 방식을 사용하였으며, 넷째, 쓰기 모드시 Voltage-up 변환기(converter) 회로를 사용하여 기준전압 발생기(Reference Voltage Generator)에는 저전압인 VDD를 사용할 수 있도록 하여 전력 소모를 줄일 수가 있었다. $0.25{\mu}m$ EEPROM 공정을 이용하여 칩을 제작하였으며, 1Kb EEPROM을 설계한 결과 읽기 모드와 쓰기 모드 시에 소모되는 전력은 각각 $4.25{\mu}W$와 $25{\mu}W$이고, 레이아웃 면적(layout area)은 $646.3\times657.68{\mu}m^2$이다. In this paper, a low-power 1Kb synchronous EEPROM is designed with flash cells for passive UHF RFID tag chips. To make a low-power EEPROM, four techniques are newly proposed. Firstly, dual power supply voltages VDD(1.5V) and VDDP(2.5V), are used. Secondly, CKE signal is used to remove switching current due to clocking of synchronous circuits. Thirdly, a low-speed but low-power sensing scheme using clocked inverters is used instead of the conventional current sensing method. Lastly, the low-voltage, VDD for the reference voltage generator is supplied by using the Voltage-up converter in write cycle. An EEPROM is fabricated with the $0.25{\mu}m$ EEPROM process. Simulation results show that power dissipations are $4.25{\mu}W$ in the read cycle and $25{\mu}W$ in the write cycle, respectively. The layout area is $646.3\times657.68{\mu}m^2$.

2종의 Ferrite가 혼합된 페라이트/ 고무 복합형 전파흡수체의 전파흡수특성

김한근,이수호,손무헌,박정학,사공 건 東亞大學校 1997 東亞論叢 Vol.34 No.-

In this study, the ferrite/rubber composite microwave absorbers mixed Ni-Zn ferrite and Ni₂Y ferroxplanna were prepared in order to control matching condition. The variation of the material constants(ε*, μ*) and microwave absorbing characteristics were investigated with various ferrite mixing ratio. The material constants of ferrite/rubber composite microwave absorber could be controlled by variation ferrite mixing ratio.

이단하소에 의해 제조된 PNN-PZ-PN 세라믹의 압전 및 유전특성

이수호,손무헌,조현철,김한근,사공 건 東亞大學校 1997 東亞論叢 Vol.34 No.-

In the fields of the optics, precise machine, semiconductors, the micro-positioning actuators are required for the control of position in submicron range. PNN-PZN-PZT cermics were fabricated with various mole ratio of the PZT[Pb(Zr½ Ti½)O₃] PNN[Pb(Ni⅓Nb⅔)O₃]and PZN[Pb(Zn⅓Nb⅔)O₃]powders prepared by double calcination and PZT powders prepared by molten-salt synthesis method. The formation rate of perovskite phase in PNN-PZN-PZT ceramics could be obtained about 92% at PZT 0.3 mole ratio. The relative permittivity of specimen with PZT 0.3 mole ratio was shown 5,320 and appeared the relaxor ferroelectric feature. The maximum piezoelectric coefficient d₃₁to be used for evaluation the displacement of piezoceramics in PNN-PZN-PZT ceramics was 324×10¹²(C/V) at the vicinity of morphotropic phase boundary and was larger than that of solid PZT ceramics(120×10-¹²C/V).

TFT -LCD 구동 IC용 커패시터 내장형 DC-DC 변환기 설계

임규호,강형근,이재형,손기성,조기석,백승면,성관영,이용진,박무훈,하판봉,김영희,Lim Gyu-Ho,Kang Hyung-Geun,Lee Jae-Hyung,Sohn Ki-Sung,Cho Ki-Seok,Baek Seung-Myun,Sung Kwan-Young,Li Long-Zhen,Park Mu-Hun,Ha Pan-Bong,Kim Young-Hee 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.7

A non-overlap boosted-clock charge pump(NBCCP) with internal pumping capacitor, an advantageous circuit from a minimizing point of TFT-LCD driver IC module, is proposed in this paper. By using the non-overlap boosted-clock swinging in 2VDC voltage, the number of pumping stages is reduced to half and a back current of pumping charge from charge pumping node to input stage is also prevented compared with conventional cross-coupled charge pump with internal pumping capacitor. As a result, pumping current of the proposed NBCCP circuit is increased more than conventional cross-coupled charge pump, and a layout area is decreased. A proposed DC-DC converter for TFT-LCD driver IC is designed with $0.18{\mu}m$ triple-well CMOS process and a test chip is in the marking. 본 논문에서는 TFT-LCD 구동 IC 모듈의 소형화측면에서 유리한 DC-DC 변환기 회로인 펌핑 커패시터 내장형 비중첩 부스트-클락 전하펌프 (Non-overlap Boosted-Clock Charge Pump: NBCCP) 회로가 제안되었다 .2VDC 전압으로 스윙하는 비중첩 부스트-클럭의 사용으로 기존의 펌핑 커패시터 내장형 크로스-커플드 전하펌프에 비해 펌핑 단의 수를 반으로 줄일 수 있었고, 전하 펌핑 노드의 펌핑된 전하가 입력 단으로 역류되는 현상을 방지하였다 . 그 결과 제안된 펌핑 커패시터 내장형 비중첩 부스트-클럭 전하펌프 회로는 기존의 펌핑 커패시터 내장형 크로스-커플드 전하펌프에 비해 펌핑 전류가 증가하였고, 레이아웃 면적은 감소되었다. 제안된 TFT-LCD 구동 IC용 DC-DC 변환기 회로를 $0.18{\mu}m$ Triple-Well CMOS 공정을 사용하여 설계하고, 테스트 칩을 제작 중에 있다.

A Risk Management For Prevention of Birds Strike In Urban Parks Close to the Airport

Mu-Geun Kim,Dam-Yong Park,Joon-Jo Moon,Hyunsu Kim 한국조류학회II 2016 한국조류학회지 Vol.23 No.2

The Western Seoul Lake Park which lies in Yangcheon Sinwol-dong of Seoul was opened in October 2009. The number and species of birds are expected to continue to increase in the future around the airspace over the Western Seoul Lake Park. The Western Seoul Lake Park is, however, geographically close to the southern end of the Gimpo Airport, and it is located on the approach surface of the obstacle limitation surfaces thereof. For that reason, the probability of bird strikes around the airspace over the Western Seoul Lake Park would be significantly high in comparison with that of bird strikes around the airspace over the other parks near the Gimpo Airport. To assessment of bird strike risk in the Western Seoul Lake Park, we visited four times between 2015 and 2016. And ducks and geese were identified as the most dangerous species. In this paper, we will, through the analysis of the Western Seoul Lake Park case, propose a new approach to bird strike risk management around that Park and also present the improvements of current relevant policies.

Self-selective fine metal line coating using surface energy differences

Mun, Mu Kyeom,Kim, Doo San,Yeom, Geun Young,Kim, Dong Woo Elsevier 2018 MICROELECTRONIC ENGINEERING Vol.187 No.-

<P><B>Abstract</B></P> <P>Self-selective coating is a new coating process that utilizes surface energy differences for metal ink coating. Hydrophobic and hydrophilic areas are defined on carbon black coated Polyimide (PI) substrate surface using atmospheric plasmas. At this state, when Ag ink is sprayed on PI, metal line is self-formed on hydrophilic surface due to its surface energy differences. As a result, an Ag ink line width of less than 6μm could be formed on the PI surface after removing the carbon black. Due to the formation of the Ag line on the hydrophilic PI surface, the adhesion force of the Ag ink formed on the PI surface was ~64% higher than that of the Ag ink formed on the hydrophobic PI surface.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Metal line in flexible device was made using new direct patterning method. </LI> <LI> Surface energy differences were used for direct patterning. </LI> <LI> Line width narrower than 6um was acquired by coating Ag ink on hydrophilic surface. </LI> <LI> Adhesion forces between the substrate were enhanced by 64% compared to that of hydrophobic substrate. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

비행시험 위해요인 식별 연구

김무근 ( Mu-geun Kim ),임인규 ( In-kyu Lim ),유병선 ( Beong-seon Yoo ),강자영 ( Ja-young Kang ) 한국항행학회 2018 韓國航行學會論文誌 Vol.22 No.4

항공기 개발 및 인증 등을 위한 비행시험은 타 항공우주산업 분야 보다 높은 항공 사고 발생 리스크를 가지고 있다. 따라서 안전관리시스템 중 리스크 관리를 위해 필요한 위해요인 식별은 비행시험 중 유사한 항공 사고를 예방할 수 있는 매우 중요한 요소이다. 그러나 국제적으로 발행되는 사고 통계자료는 통상적으로 상업 운송용 항공기에 국한된 것으로 비행시험의 특성을 반영하지 못하고 있으며, 국내 여건 또한 비행시험 중 위해요인을 식별할 수 있는 각종 데이터베이스가 구축되어 있지 않거나 가용하지 않은 실정이다. 따라서 본 연구에서는 항공기의 개발 및 인증을 위한 비행시험 특성을 알아보고, 리스크 관리에 필요한 국제기구 및 항공선진국 등에서 구축한 항공 사고 통계 및 예방 자료 등을 기초로 항공 사고의 주요 원인을 추적해 보았다. 미국교통안전위원회가 보유하고 있는 항공 사고/준사고 데이터베이스 중 비행시험 시 발생한 총 312건의 최종 보고서가 조사되었으며, 약 200여개의 비행시험 위해 요인이 식별되었다. 본 연구의 결과는 향후 국가종합 비행성능시험장의 안전관리시스템 구축을 위한 기초 자료로 활용될 예정이다. Flight tests for aircraft development and certification have higher air accidents risk than other aerospace industries. Accordingly risk identification necessary for risk management in the safety management system is a very important factor in preventing similar air accidents during flight tests. But internationally issued accident statistics are usually confined to commercial transport aircraft and they do not reflect characteristics of flight tests, also databases to hazards identification during flight tests are not established or available in Republic of Korea. Therefore, we identified flight test procedures and traced the major causes of aviation accidents based on the statistics and preventive materials for risk management which were issued by international organizations and advanced countries of aviation. A total of 312 final reports classified as flight test among air accident/incident database held by U.S. NTSB were researched and about 200 flight test hazard were identified. The results of this study will be used as basic data for establishing the safety management system of the national comprehensive flight performance test site.

상용드론 시범운용 사례를 통한 신기술적용 체계 획득절차 개선안 수립

김무근(Mu-Geun Kim),김영훈(Young-Hoon Kim),이근호(Geun-Ho Lee),조정권(Jeong-Kwon Cho) 한국해군과학기술학회 2022 Journal of the KNST Vol.5 No.2

The Korean government is implementing various policies for the development of the commercial drone industry, and the military is also supporting industrialization through rapid acquisition procedures and commercial product demonstration procedures in order to quickly apply a civilian high-tech system into the military field. Recognizing that the need-based acquisition procedure is not suitable for the military field of rapidly developing civilian technology, a system with new technology can be tested after pre-purchase even if the requirements are not established. In this paper, various acquisition procedures applied by the military were investigated, and the current acquisition procedures were analyzed through the operation of commercial products. Through this, the revised acquisition procedure that can be applied to the technology-based military field was shown.

돼지 관상동맥 스텐트 재협착 모델에서 Carvedilol 부착 Biodiv Ysio(TM) 스텐트의 신생내막 증식 억제 효과

김원 ( Kim Won ),정명호 ( Jeong Myeong Ho ),차광수 ( Cha Gwang Su ),이승현 ( Lee Seung Hyeon ),홍영준 ( Hong Yeong Jun ),김주한 ( Kim Ju Han ),안영근 ( An Yeong Geun ),박옥영 ( Park Og Yeong ),김무현 ( Kim Mu Hyeon ),조정관 ( Jo 대한내과학회 2004 대한내과학회지 Vol.66 No.1

목적 : Carvedilol은 알파 및 베타수용체 차단제로서 혈관 평활근 세포의 이동과 증식을 억제하며, 동물실험에서 신생내막의 증식을 효과적으로 억제하였다. 저자 등은 돼지 관상동맥 스텐트 재협착 모형을 이용하여 carvedilol 부착 스텐트의 스텐트 내 신생내막 증식 억제와 스텐트 재협착의 예방에 대한 효과를 알아보고자 하였다. 방법 : 실험용 동물은 25~35 kg의 암돼지를 aspirin과 ticlopidine으로 전처치하고, 확립된 방법을 이 Background : Carvedilol is a beta- and alpha-receptor blocker, a direct inhibitor of smooth muscle cell proliferation and migration, and produces a significant suppression of neointimal hyperplasia in rat carotid injury model. We tested whether carvedilol