• Transactions on Control, Automation and Systems Engineering
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• v.1 no.1
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• pp.75-86
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• 1999

An air-data estimator for generic air-breathing hypersonic vehicles (AHSVs) is developed and demonstrated with an example vehicle configuration. The AHSV air-data estimation strategy emphasized improvement of the angle of attack estimate accuracy to a degree necessitated by the stringent operational requirements of the air-breathing propulsion. the resulting estimation problem involves highly nonlinear diffusion process (propagation); consequently, significant distortion of a posteriori conditional density is suspected. A simulation based statistical analysis tool is developed to characterize the nonlinear diffusion process. The statistical analysis results indicate that the diffusion process preserves the symmetry and unimodality of initial probability density shape state variables, and provide the basis for applicability of an Extended Kalman Filter (EKF). An EKF is designed for the AHSV air-data system and the air data estimation capabilities are demonstrated.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.2
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• pp.67-73
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• 2008

Reconfigurable radio technology is needed to reconstruct frequency and modem functionality, which can be different within various regions. In addition, it makes it possible for a single mobile handset to support various standards of wireless communication, and thus plays a key role inmobile convergence. A MMIC VCO(Monolithic Microwave Integrated Circuit Voltage Controlled Oscillator) has been developed to produce high power and wide bandwidth that adapts the Clapp-Gouriet type oscillator for series feedback. We were fabricated based on the 0.15um pHEMT from TRW. The MMIC VCO was connected to an alumina substrate on the carrier for testing. This MMIC VCO module shows good performance when compared with existing VCOs. Futhermore, it has potential as a reconfigurable MMIC VCO for ubiquitous communications such as LMDS (Local Multipoint Distribution Service), VSAT, Point to Point Radio and SATCOM.

• Journal of Electrical Engineering and Technology
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• v.5 no.1
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• pp.151-155
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• 2010

Reconfigurable radio technology is needed to reconstruct frequency and modem functionality, which can be different in various regions. In addition, it makes a single mobile handset capable of supporting various standards of wireless communication and thus plays a key role in mobile convergence. An MMIC VCO (voltage controlled oscillator) has been developed for high power and wide bandwidth where Clapp-Gouriet type oscillators are adapted for series feedback, and was fabricated based on 0.15um pHEMT of TRW. The MMIC VCO was connected to an aluminar substrate on the carrier for testing. This MMIC VCO module showed good performance in comparison to existing works. Furthermore, it can be potentially extended to reconfigure an MMIC VCO for wireless systems such as military applications and satellite communications.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.36-37
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• 2000

정밀 지상관측 위성인 다목적실용위성 1호기에는 해상도 6.6 m인 전자광학카메라(EOC)가 탑재되어 현재 우수한 영상을 보내오고 있으며 2003년 발사예정인 2호기를 위하여 해상도 1 m의 Multispectral Camera(MSC)가 개발중이다. 미 TRW 사가 제작한 EOC 개발에 항우연의 연구진은 그 설계 및 시험의 각 단계별 검토와, 탑재, 위성전체 시험과 보정을 포함한 궤도운용 등의 수행과 함께, 개발기간 동안 현지에서 수행된 별도의 현장교육을 통하여 동급의 위성카메라를 실제 개발할 수 있는 설계기술을 이전받았다. 수차례 대구경 비구면 광학계 제작 경험을 더한 항우연은 MSC 공동개발선인 이스라엘 ELOP 사와 현재 그 설계를 진행하고 있다. (중략)

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.499-502
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• 2012

문양이나 패턴이 없는 민 무늬의 물체에는 동일점 정합에 의해 3 차원 계측을 하는 스테레오 정합방식을 적용할 수 없다. 본 논문에서는 난수 발생 함수로 제작한 랜덤 칼라 패턴을 대상물체에 투영하여, 대상 물체 표면에 특징적인 문양을 인위적으로 생성시키는 것에 의해 민 무늬의 물체를 스테레오 정합법으로 측정하는 방식을 제안한다. 투사된 패턴으로 자체 문양을 지니게 된 물체를 스테레오 카메라로 촬영하였고, 동일점 정합은 전역 스테레오 정합 방식의 일종인 TRW 방식에 의한 컬러 매칭 방식을 사용하였다. 제안된 방식은 원형의 흰색 석고상 3 차원 계측에 적용되었고, 안정적이고 정확한 스테레오 정합 계측 결과를 보였다.

• Proceedings of the KSRS Conference
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• 1999.11a
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• pp.198-203
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• 1999

Korea Multi-Purpose Satellite-1 (KOMPSAT-1) is developed by the Korea Aerospace Research Institute (KARI) with the aid of TRW and will be launched on the Nov. 24, 1999 at the Vandenberg Air Base in CA, U.S, Now, the satellite application group in KARI is preparing for the service with the KOMPSAT-1 satellite data. For the purpose of supplying good service to the users, data application planning has to be established before launching satellite. To use satellite data effectively, KARI makes a plan for data policy, data price, mission planning, and commercializing strategy. This study was carried out with the purpose of effective use of satellite data. For this purpose, KARI makes a user group first. There are 58 user groups to use KOMPSAT-1 data for public welfare and research sectors. These user groups include government, public corporations, institutes, and universities. KARI will offer the service to users through online using Internet. Secondly, KARI makes a policy for the priority of KOMPSAT-1 missions. These are classified by the mission priority, payloads, and operational states etc. Thirdly, KARI will make data policy and data price of KOMPSAT- 1 based on the basic master 1)tan. Especially, data price will be determined at trte KOMPSAT-1 committee including Ministry of Science and Technology (MOST). KARI is also trying to commercialize the data with the domestic and foreign companies to expand the use of KOMPSAT-1 data in the industries sector. Afterward in this study, KARI will continue the improvement for the effective distribution of KOMPSAT-1 data for all users.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.2
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• pp.227-231
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• 2004

A MMIC (Monolithic Microwave Integrated Circuit) mixer chip using the schottky diode of InGaAs/CaAs p-HEMT process has been developed for receiver down converter of Ka-band. A different approach of MMIC mixer structure is applied for reducing the chip size by the exchange of ports between IF and LO. This MMIC covers with RF (30.6∼31.0㎓)and IF (20.8∼21.2㎓). According to the on-wafer measurement, the MMIC mixer with miniature size of 3.0mm1.5mm demonstrates conversion loss below 7.8㏈, LO-to-RF isolation above 27㏈, LO-to-IF isolation above 19㏈ and RF-to-IF isolation above 39㏈, respectively.

• Korean Journal of Remote Sensing
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• v.15 no.4
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• pp.349-356
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• 1999

Korea Multi-Purpose Satellite-l (KOMPSAT-l) has been developed by the Korea Aerospace Research Institute (KARI) with the aid of TRW and will be launched on the December 21, 1999 at the Vandenberg Air Base in CA, U.S. Now, the satellite application group in KARI is preparing for the service with the KOMPSAT-l satellite data. For the purpose of supplying good service to the users, data application planning has to be established before launching satellite. To use satellite data effectively, KARI makes a plan for data policy, data price, mission planning, and commercializing strategy. This study was carried out with the purpose of effective use of satellite data. For this purpose, KARI, first, made 60 user groups to use KOMPSAT-l data for public welfare and research sectors. These user groups include government, public corporations, institutes, and universities. KARI will offer the service to users through online using Internet. Secondly, KARI made a policy for the priority of KOMPSAT-l missions. These are classified by the mission priority, payloads, and operational states etc. Thirdly, KARI will make data policy and data price of KOMPSAT-l based on the basic master plan. Especially, data price will be determined at the KOMPSAT-l committee including Ministry of Science and Technology (MOST). KARI is also trying to commercialize the data with the domestic and foreign companies to expand the use of KOMPSAT-l data in the industries sector. Afterward in this study, KARI will continue the improvement for the effective distribution of KOMPSAT-l data for all users.

• Proceedings of the Korean Society of Plant Pathology Conference
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• 2003.10a
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• pp.135.2-136
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• 2003

To characterize plasmids in Xanthomonu axonopodis pv. glycines, we isolated plasmids pAG1 from the strain AG1 and pXAG81 and PXAG82 from the strain Bra, respectively, and sequenced three plasmids. The size of plasmids, pAG1, pXAG81, and pXAG82 was 15,149-base pairs (bp), 26,727-bp, and 1,496-bp, respectively Fifteen and twenty six possible open reading frames (ORFs) were present in pAG1 and pXAG81, respectively. Only one ORF homologous to a rep gene of Xylella fastidiosa was present in pXAG82. pAG1 contained genes homologous to avrBs3, tnpA, tnpR, repA, htrA, three parA genes, M.XmaI, R.XmaI, and six hypothetical proteins. pXAG81 contained genes homologous to avrBs3, tnpA, tnpR, repA, htrA, two parA genes, pemI, pemK, mobA, mobB, mobC, mobD, mobE, trwB, traF, traH, ISxac2, and eleven hypothetical proteins. Based on DNA sequence analysis, we presume that pXAG81 is a conjugal plasmid. Interestingly, we found 0.5-kb truncated avirulence gene similar to aurXacE3 on the right border of avrBs3 homolgs of pAG1 and pXAG81. Two hundred twenty five isolates were analyzed to find aurBS3 or tra gene homologs by Southern hybridization. The numbers of avrBs3 homolog varied from 3 in AG1 to 8 in AG166. Two hundred seventeen isolates appeared to can conjugative plasmids (pXAG81 type), and thirty eight isolates appeared to carry non-conjugative plamids (pAGl type). This indicated that aurBs3 gene homologs might be spread by conjugation in X. axonopodis pv. glycines.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.7
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• pp.1191-1198
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• 2001

MMIC low noise amplifiers for millimeter-wave application using 0.15 $\mu$m pHEMT have been presented in this paper. The design emphasis is on active device model and EM simulation. The deficiency of conventional device models is identified. A distributed device model has been adapted to circumvent the scaling problems and, thus, to predict small signal and noise parameters accurately. Two single-ended low noise amplifier are designed using distributed active device model for Q-band(40 ∼ 44 GHz) and V-band(58 ∼65 GHz) application. The Q-band amplifier achieved a average noise figure of 2.2 dB with 18.3 dB average gain. The V-band amplifier achieved a average noise figure of 2.9 dB with 14.7 dB average gain. The design technique and model employed provides good agreement between measured and predicted results. Compared with the published data, this work also represents state-of-the-art performance in terms of gain and noise figure.