• 전기학회논문지
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• 제67권3호
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• pp.433-439
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• 2018

In this paper, a SDINS(strapdown inertial navigation system) rapid initial alignment technique with adaptive time delay compensation is proposed. The proposed method consists of two steps. In first step, misalignment and data latency are estimated by conducting pre-transfer alignment. Then, hybrid alignment is designed to rapidly find the misalignment changes induced by pyro-shock. To improve the performance of hybrid alignment, adaptive time delay compensation method is suggested. We verify the performance improvement of the proposed alignment scheme comparing with the conventional transfer alignment method by van test. The test result shows that the proposed alignment technique improves alignment performance.

• 대한음성학회지:말소리
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• 제68권
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• pp.95-114
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• 2008

The recent growing popularity of statistical methods in machine translation requires much more large parallel corpora. A Korean-English parallel corpus, however, is not yet enoughly available, little research on this subject is being conducted. In this paper we present a hybrid method of aligning sentences for Korean-English parallel corpora. We use bilingual news wire web pages, reading comprehension materials for English learners, computer-related technical documents and help files of localized software for building a Korean-English parallel corpus. Our hybrid method combines sentence-length based and word-correspondence based methods. We show the results of experimentation and evaluate them. Alignment results from using a full translation model are very encouraging, especially when we apply alignment results to an SMT system: 0.66% for BLEU score and 9.94% for NIST score improvement compared to the previous method.

• 반도체디스플레이기술학회지
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• 제20권4호
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• pp.119-124
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• 2021

In a situation where Moore's law, which states that the performance of semiconductor integrated circuits doubles every two years, is showing a limit from a certain point, and it is difficult to increase the performance due to the limitations of exposure technology.In this study, a wafer hybrid method that can increase the degree of integration Various research on bonding technology is currently in progress. In this study, in order to achieve rotational precision between wafers in wafer hybrid bonding technology, modeling of θ_z alignment stage and VCM actuator modeling used for rotational alignment, magnetic field analysis and desgin, control, and evaluation are performed. The system of this study was controlled by VCM actuator, capactive sensor, and dspace, and the working range was ±7200 arcsec, and the in-position and resoultion were ±0.01 arcsec. The results of this study confirmed that safety and precise control are possible, and it is expected to be applied to the process to increase the integration.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.241-245
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• 2003

In this paper, a microassembly system based on hybrid manipulation schemes is proposed and applied to the assembly of a photonic component. In order to achieve both high precision and dexterity in microassembly, we propose a hybrid microassembly system with sensory feedbacks of vision and force. This system consists of the distributed 6-DOF micromanipulation units, the stereo microscope, and haptic interface for the force feedback-based microassembly. A hybrid assembly method, which combines the vision-based microassembly and the scaled teleoperated microassembly with force feedback, is proposed. The feasibility of the proposed method is investigated via experimental studies for assembling micro opto-electrical components. Experimental results show that the hybrid microassembly system is feasible for applications to the assembly of photonic components in the commercial market with better flexibility and efficiency.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 추계학술대회 논문집 Vol.17
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• pp.575-578
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• 2004

In this study, we designed HAN(hybrid-aligned nematic) cell using novel tilt angle control method. It was possible to make novel HAN cell using a single polyimide by hot plate baking method. This new HAN cells showed slower response time as compared with conventional HAN cell. However, the alignment state and V-T curve of HAN cell using novel method were acceptable. Also, it showed better C-V characteristic than that of conventional HAN cell.

• 한국산학기술학회논문지
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• 제22권2호
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• pp.11-19
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• 2021

본 논문에서는 주파수 효율적으로 다중 유니캐스트와 멀티캐스트 스트림을 동시에 전송하기 위한 채널정렬 기반 비직교 다중접속 방법을 제안한다. 이 방법에서 멀티캐스트 클러스터 내 수신기들은 자신의 채널을 정렬하는 수신 빔포밍 벡터를 채용하고 기지국은 정렬된 채널 정보를 이용하여 멀티캐스트 클러스터 간 간섭을 제거하는 송신 빔포밍 벡터를 설계한다. 유니캐스트 수신기들은 송신 빔포밍 벡터와 결합된 유효수신채널 정보를 이용하여 유니캐스트 수신기 간 간섭을 제거하는 수신 빔포밍 벡터를 설계한다. 제안한 방법은 간섭을 효과적으로 제거하여 높은 SNR 영역에서 기존의 직교 다중접속 방법보다 높은 총합 데이터 율을 달성한다. 또한 제안한 비직교 다중접속 방법과 기존의 직교 다중접속 방법의 장점을 결합하는 하이브리드 방법을 제안한다. 이 방법은 채널상태에 따라 적응적으로 낮은 SNR 영역에서는 수신신호전력을 향상하는 기존의 직교 다중접속 방법을 적용하고 높은 SNR 영역에서는 효과적으로 간섭을 제거하는 제안한 비직교 다중접속 방법을 적용한다. 이를 통해 제안한 하이브리드 방법은 전체 SNR 영역에서 우수한 총합 데이터율을 달성한다.

• 한국통신학회논문지
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• 제31권11A호
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• pp.1053-1058
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• 2006

본 논문은 GE-PON 등 FTTH용 광액세스망 시스템에 사용되는 저가격 광모듈 제작을 위하여, 1.31/1.49um 양방향 구성의 하이브리드집적 PLC칩을 사용한 효율적인 광모듈 패키징 기술을 제안하였다. 수동 광섬유정렬기술과 nonhermetic 플라스틱 패키지 기술을 적용하여 광모듈을 제작하였으며, 광결합효율과 전기-광학적 특성을 측정하였다. 제작된 광모듈의 광결합효율은 광축정렬 허용오차 40um내에서 0.5dB이하의 광결합손실을 나타내었고, -24dBm 이하의 수신감도와 광출력 1.5mW이상, 소광비 10dB이상, tracking error 0.3dB이하의 온도특성이 GE-PON ONU용 광모듈 규격을 만족함을 확인하였다.

• 로봇학회논문지
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• 제16권3호
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• pp.250-259
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• 2021

Path planning is one of the important technologies for automated parking. It requires to plan a collision-free path considering the vehicle's kinematic constraints such as minimum turning radius or steering velocity. In a complex parking lot, Rapidly-exploring Random Tree^* (RRT^*) can be used for planning a parking path, and Reeds-Shepp or Hybrid Curvature can be applied as a tree-extension method to consider the vehicle's constraints. In this case, each of these methods may affect the computation time of planning the parking path, path-tracking error, and parking success rate. Therefore, in this study, we conduct comparative analysis of two tree-extension functions: Reeds-Shepp (RS) and Hybrid Curvature (HC), and show that HC is a more appropriate tree-extension function for parking path planning. The differences between the two functions are introduced, and their performances are compared by applying them with RRT^*. They are tested at various parking scenarios in simulation, and their advantages and disadvantages are discussed by computation time, cross-track error while tracking the path, parking success rate, and alignment error at the target parking spot. These results show that HC generates the parking path that an autonomous vehicle can track without collisions and HC allows the vehicle to park with lower alignment error than those of RS.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제4권7호
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• pp.291-296
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• 2015

본 논문에서는, 눈 검출에서의 픽셀 선택 방법을 이용한 편향 판별 분석(BDA) 기반의 신뢰 척도를 제안하고 이를 이용하여 hybrid 눈 검출기를 설계한다. 이를 위해 눈 조각 영상에서 먼저 판별 분석에 유용한 픽셀들을 선택하여 부분 영상을 만들고, 부분 영상에 BDA를 적용하여 신뢰 척도를 위한 특징 공간을 구성한다. Hybrid 눈 검출기를 구성하는 기본 검출기로는 상호 보완적인 특성을 가진 HFED와 MFED를 사용하였다. 주어진 영상에 대해, 기본 검출기들에 의해 생성된 눈 좌표를 가지고 생성한 눈 조각 영상의 부분 영상들을 BDA 특징공간에 투영하여 positive 샘플의 평균과의 거리를 측정함으로써 그 정확성을 측정하고, 기본 검출기의 결과들 중에서 신뢰도가 높은 결과를 최종 눈 검출 결과로 사용한다. 다양한 얼굴 데이터베이스들에 대한 실험 결과에서, 제안한 방법은 검출된 눈 좌표의 정확도 측면에서 뿐만 아니라 검출된 눈 좌표를 이용한 얼굴 인식 성능에서도 다른 방법들보다 우수한 결과를 나타내었다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.237-241
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• 2008

Femtocells are cellular access points that connect to a mobile operator's network using residential DSL or cable broadband connections. They have been developed to work with a range of different cellular standards including CDMA, GSM and UMTS. Like legacy base station, the frequency accuracy and phase alignment is necessary for ensuring the quality of service (QoS) for applications such as voice, real-time video, wireless hand-off, and data over a converged access medium at the femtocell. But, the GPS has some problem to be used at the femtocell, because it is difficult to set-up, depends on the satellite condition, and very expensive. So, some techniques are discussed to alternate with the legacy GPS system. NTP, PTP, Synchronous Ethernet use the ethernet to synchronize distributed clocks in packet networks. AGPS support reliable position information than the legacy GPS in poor signal conditions. But, These method also have some problems. So, hybrid timing method like A-GPS+PTP and TV+GPS was developed to make up the weak point of GPS. This paper introduces the each method and compare each other and y propose much better solution for timing synchronization at the Femtocell