• 대한후두음성언어의학회지
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• 제18권1호
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• pp.16-21
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• 2007

Many kinds of materials have been used up to now for vocal fold paralysis. Although silastic block has been the most popular material, some difficulties in carving, positioning, and placing have been the causes to find more easily applicable materials. Hy-droxylapatite, gelfoam, hyaluronic acid and fat have been suggested and used for this purposes with some limitations. During last decade, Gore-Tex was introduced and replacing old materials and showed good surgical results with less difficulties. This material is biocompatible and familiar to surgeons because it had been invented in 1960's. In addition it is easy to shape and place Gore-Tex into the window with many clinical experiences. In some problem cases, it is easy to remove from the body with less damage to surrounding tissue. The basic surgical techniques are as follows. 1) Creating window. 2) Positioning and placing the material. 3) Immobilizing the material and closing the window. The modified methods ae introduced in details with figures.

• 한국가금학회지
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• 제23권1호
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• pp.9-17
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• 1996

이 연구의 목적은 주입구의 위치에 따른 병아리 배아의 생존율을 서로 비교하고 가장 적합한 주입구 위치를 찾기 위하여 실시되었다. 멸균처리된 핀셋을 사용하여 난각의 첨단부와 둔단부 그리고 옆부분에 주입구를 각각 만들었다. 연구 결과, 둔단부에 주입구 (BE1)를 만든 수정란의 발생율이 가장 높았으나 내부난각막이 불투명하여 혈관내 미세주입이 어렵다. 따라서 본 연구에서는 첨단부에 주입구를 만든 다음 이 주입구를 통하여 약 2 $\mu$L의 DMEM 용액을 2.5일령된 배자의 혈관에 주입하였고, 주입부위의 출혈을 막기 위해 DMEM 용액을 주입한 후 공기방울을 넣은 결과 생존율이 약 17.0% 이었다. 따라서 이러한 주입구에 의한 방법은 생식세포가 조작된 germline chimera 또는 형질전환닭을 생산하는데 매우 유용한 시스템으로 이용될 수 있을 것이다.

• 반도체디스플레이기술학회지
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• 제22권2호
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• pp.112-119
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• 2023

In urban environments, signals of Global Positioning System (GPS) can be blocked and reflected by tall buildings, large vehicles, and complex components of road network. Therefore, the performance of the positioning system using the GPS module in urban areas can be degraded due to the loss of GPS signals necessary for the position estimation. To deal with this issue, various localization schemes using inertial measurement unit (IMU) sensors, such as gyroscope and accelerometer, and Bayesian filters, such as Kalman filter (KF) and particle filter (PF), have been designed to enhance the performance of the GPS-based positioning system. Among Bayesian filters, the PF has been widely used for the target tracking and vehicle navigation, since it can provide superior performance in estimating the state of a dynamic system under nonlinear/non-Gaussian circumstance. This paper presents a positioning system that uses the double-stacked particle filter (DSPF) as well as the accelerometer, gyroscope, and GPS receiver on the smartphone to provide higher pedestrian positioning accuracy in urban environments. The DSPF employs a nonparametric technique (Parzen-window) to create the multimodal target distribution that approximates the posterior distribution. Experimental results show that the DSPF-based positioning system can provide the significant improvement of the pedestrian position estimation in urban environments.

• Journal of Positioning, Navigation, and Timing
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• 제8권4호
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• pp.215-223
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• 2019

This paper analyzes navigation performances of the Korean Positioning System (KPS) constellation with respect to the orbit parameters which fulfills the specification requirements. Specifically, the satellite configuration and navigation requirements of KPS are explained, and the daily mean horizontal dilution of precision (HDOP) and satellite visibility on KPS coverage are analyzed to confirm the adequate orbit parameters. However, due to orbital slot saturation, geostationary-orbit (GEO) satellites may not be allocated in the original orbit as specified in the KPS requirements. Therefore, in a spanned window of 4 degrees from the reference longitude the navigation performance of each GEO satellite orbit is investigated.

• 한국통신학회논문지
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• 제41권8호
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• pp.859-867
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• 2016

GPS(Global Positioning System)는 미국에서 군사목적으로 이용하기 위해 개발된 위치측정 시스템으로, 현재는 우리나라를 포함한 각 국에서 군용뿐만 아니라 민간에도 유용하게 쓰이고 있다. 하지만 GPS는 위성으로부터 지면에 도달하는 신호의 세기가 매우 약해서 전파방해신호(Jamming Signal)에 약하다는 단점을 가진다. 본 논문에서는 수신된 GPS 신호에 협대역의 전파방해 신호가 존재한다고 가정하고, 새로운 협대역 전파방해신호 제거 알고리즘을 제안한다. 우선, GPS 수신기에서 수신한 신호를 FFT를 이용하여 주파수 성분으로 표현하며, FFT로 인하여 발생하는 Spectral Leakage의 영향을 줄이기 위하여 Blackman-Harris window를 적용한다. Blackman-Harris window의 주파수 응답을 형태를 이용하여, 가장 큰 파워를 가지는 주파수 성분을 찾고 그 주변으로 일정한 개수의 성분을 제거하는 알고리즘을 제안하였다. 주로 쓰일만한 128~512포인트의 FFT를 사용할 시에 고정적으로 최대값 주변의 42개의 성분을 제거하는 것이 가장 최적임을 알 수 있었다.

• 한국실내디자인학회논문집
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• 제15권3호
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• pp.111-117
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• 2006

In the recent years, domestic construction companies have tried to differentiate their apartments using brand positioning. Respective construction companies are attracting public attention with discriminative brands. This study investigated residents' preferences focusing on apartments facade design used in marketing strategy of brand apartments. Four concepts in surveyed brand apartments are deluxe, modern, eco-friendly and comfortable. According to the related study on design factor of apartment facade, the design factors are chosen such as the overall building shape, balcony form, main color, exterior wall shape, material, main access shape, pent house design and window size. As a result of analysis, there was a difference between brand concepts and consumers' views. Therefore, apartment facade design to differentiate their own companies' brand images should consider the perception of customers.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.317-320
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• 2006

Ships and their cargos have been managed safely by positioning report system. However, little attention has been paid to safety of crew's works with danger. The attempt that used PHS inboard was before by the present authors. However, the functions were just voice call and mail exchange. The data acquisition from the terminal by proper control was not possible. Thus the position of the terminal was not available. As for the cell phone of next generation, GPS receiver and wireless LAN are installed by manufacturers. Therefore, we propose a system which uses a cell-phone with GPS receiver on a ship in order to promote the safety of ship's crew. We checked the availability of cell-phone GPS receiver at thirty different points inboard. The positioning was not possible in the areas further than 4m from the window. Then, we proposed the system which follows the positions of the crews and confirms their safety inboard by using the VoIP (Voice over Internet Protocol) function by wireless LAN.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.206-210
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• 1989

In automobile glass fitting the stud is welded on the window seating panel in order to insert the plastic molding onto the stud. Since this type of process is in general manually done, almost 50% of the output turns out to be failure resulted from work inefficiency and weld inferiority. Therefore, it is required to improve this process for the productivity elevation through the application of the robot.

• 한국철도학회논문집
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• 제10권3호
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• pp.343-349
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• 2007

The flow velocity distribution at inlet and exit of a DPF was measured using a Pitot tube and 2-D positioning equipment. An adaptor which was designed for accessing the Pitot tube probe into inlet of the DPF was fabricated with inlet flange of the DPF. The Pitot tube which was mounted in the 2-D positioning machine could access to the inlet of the DPF through the rectangular window of the adaptor. Automation of the velocity measurement at the inlet and exit of the DPF was effectively achieved and measuring time was reduced drastically. The flow velocity distribution at the inlet of the DPF showed parabola shape with maximum velocity near to the center of the DPF, as expected. The velocity distribution at the exit of the DPF showed crown shape, that is, the flow velocity distribution near to the center of the DPF is lower than that at surrounded peripheral region of the DPF.

• 한국측량학회지
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• 제9권2호
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• pp.49-56
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• 1991

본 연구에서는 SPOT 위성자료를 이용함에 있어 경제적 시간적 효용성을 증대시키기 위해, CCT 형태의 수치영상자료를 일반 PC 영상처리체계로 처리하여 3차원 위치를 결정하고자 하였으며, 위성영상의 상좌표취득에는 통계적 이론에 근거한 영상정합기법을 도입, 좌표취득의 신뢰도를 분석하여 수치표고모형생성, 정사사진의 작성 등에 요구되는 3차원 위치결정에 관한 새로운 알고리즘을 제시하였다. CCT 형태의 수치위성영상을 이용한 상좌표취득에 있어서 영상정합기법을 적용한 결과, 육안관측에 의하여 상좌표를 취득하는 방법에 비하여 수평위치 및 높이결정의 정확도를 향상시킬 수 있었다. 상좌표취득을 위해 영상상관기법을 적용할 경우, 기준영역의 크기를 변화시켜 상관계수를 구한 결과, 19$\times$19 영상소의 기준영역이 상좌표취득에 있어 가장 적합한 크기임을 알 수 있었으며, 이러한 결과를 바탕으로 SPOT 위성자료를 해석함에 있어 수치영상의 활용에 관한 알고리즘을 제시할 수 있었다.