• 정보통신설비학회논문지
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• 제2권2호
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• pp.22-31
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• 2003

광통신 실습교육이 대학 및 전문교육기관에서 이루어지고 있으나 실습의 내용이 각부분별로 이루어지고 있어 광통신망 구축의 전반적인 내용을 이해하기 어려웠으며, 이에 따라 광통신의 교육은 단순한 접속위주의 교육만이 이루어져 시공현장에서는 단순한 기능인력으로만 취급되어져 왔다. 따라서, 시공현장에서 광통신망에 전체적인 내용을 평가하고 설계, 감독 및 실제 융착 접속까지 전반전인 내용을 습득할 수 있는 종합 광통신 실습교육 과정 및 종합교육장이 필요로 하게 되었다. 본 연구에서는 광통신 시공인력을 위한 실습교과 과정의 필요내용과 이를 실습할 종합광통신 실습장 구현에 필요한 내용을 제시하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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• pp.95-99
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• 1998

We introduce an autonomous flying system using a model-helicopter. A feature of the helicopter is that autonomous flight is realized on the low-cost compact model-helicopter. Our helicopter system is divided into two parts. One is on the helicopter, and the other is on the land. The helicopter is loaded with a vision sensor and an electronic compass including a tilt sensor. The control system on the land monitors the helicopter movement and controls. We firstly introduce the configuration of our helicopter system with a vision sensor and an electronic compass. To determine the 3-D position and posture of helicopter, a technique of image recognition using a monocular image is described based on the idea of the sensor fusion of vision and electronic compass. Finally, we show an experiment result, which we obtained in the hovering. The result shows the effectiveness of our system in the compact model-helicopter.

• 한국측량학회지
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• 제20권2호
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• pp.137-143
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• 2002

본 연구에서는 레이저스캐닝 데이터의 일종인 LIDAR 데이터를 이용하여 수치정사사진 제작에 관한 연구를 수행하였다. 이를 위하여 LIDAR를 이용하여 얻은 XYZ 절점자료(point data)로부터 TIN(Triangular Irregular Network)을 형성한 후. 이로부터 DSM(Digital Surface Model) 을 제작하였다. 그러나 이 과정에서 수치정사사진의 품질에 악영향을 줄 수 있는 절단선(break line)에서의 노이즈가 DSM에서 발생하였다. 따라서 본 연구에서는 이러한 절단선에서의 노이즈를 처리할 수 있는 여러 가지 기법을 적용하였다. 그 결과 건물을 추출하여 저지대(低地帶)에 대한 LIDAR DEM과 합성하는 기법이 가장 적절하다는 결론을 도출하였으며, 이렇게 제작된 LIDAR DSM으로 수치정사사진을 제작하고 품질을 평가해 본 결과 도화축척 1:5,000보다 높은 위치정확도를 지닌 수치정사사진의 제작이 가능하였다.

• 한국측량학회지
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• 제38권5호
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• pp.407-414
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• 2020

SVM (Support vector machine) analysis was performed after applying a deep learning technique based on an Inception-based model (GoogLeNet). The accuracy of automatic image classification was analyzed using an SVM with multiple virtual grid sizes. Six classes were selected from a standard land cover map. Cars were added as a separate item to increase the classification accuracy of roads. The virtual grid size was 2-5 m for natural areas, 5-10 m for traffic areas, and 10-15 m for building areas, based on the size of items and the resolution of input images. The results demonstrate that automatic classification accuracy can be increased by adopting an integrated approach that utilizes weighted virtual grid sizes for different classes.

• 대한전기학회논문지:시스템및제어부문D
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• 제50권9호
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• pp.430-438
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• 2001

In this study, we introduce the adaptive Polynomial Neuro-Fuzzy Networks(PNFN) architecture generated from the fusion of fuzzy inference system and PNN algorithm. The PNFN dwells on the ideas of fuzzy rule-based computing and neural networks. Fuzzy inference system is applied in the 1st layer of PNFN and PNN algorithm is employed in the 2nd layer or higher. From these the multilayer structure of the PNFN is constructed. In order words, in the Fuzzy Inference System(FIS) used in the nodes of the 1st layer of PNFN, either the simplified or regression polynomial inference method is utilized. And as the premise part of the rules, both triangular and Gaussian like membership function are studied. In the 2nd layer or higher, PNN based on GMDH and regression polynomial is generated in a dynamic way, unlike in the case of the popular multilayer perceptron structure. That is, the PNN is an analytic technique for identifying nonlinear relationships between system's inputs and outputs and is a flexible network structure constructed through the successive generation of layers from nodes represented in partial descriptions of I/O relatio of data. The experiment part of the study involves representative time series such as Box-Jenkins gas furnace data used across various neurofuzzy systems and a comparative analysis is included as well.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.1984-1986
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• 2001

In order to provided continuous solutions, latest developing navigation systems tend to integrate GPS receiver with INS or DR. Using the GPS carrier-phase measurements, an attitude GPS receiver with three antennas obtain the 3-dimensional attitude such as roll, pitch, and heading as well as position and velocity. With these angle measurements, in the attitude GPS/INS integrated system, attitude or gyro errors can be directly compensated. In this paper, we develop an integrated navigation system that combines attitude GPS receiver with INS. The performance of real-time integrated navigation system is determined by not only the implements of integration filter but also the synchronization of measurements. To meet these real-time requirements, the navigation software is implemented in multi-tasking structure in this paper. We also employ time-synchronization technique in the multi-sensor fusion. Experimental results show that the performance of the attitude GPS/INS integrated system is consistent even when cycle-slip occurs in carrier-phase measurements.

• 한방재활의학과학회지
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• 제28권4호
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• pp.59-69
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• 2018

Objectives This is one of the manuals of East-west integrative medicine which was created by the Committee on integrative medicine of Chung-Yeon Korean Medicine Hospital. The purpose of this manual is to support clinical decision making and communication during the rehabilitation of patients after lumbar spine surgery. Methods The drafting was done by two rehabilitation specialists in Korean Medicine. After a rehabilitation specialist in western medicine reviewed the draft and exchanged their ideas, a revised version that reflects the goal of consultation was made. Then the Committee agreed to adopt the manuals through the process of review and feedback in addition to face-to-face discussions. Results This manual describes clinical decision making for rehabilitation after lumbar microdiskectomy, interbody fusion, and kyphoplasty. Therefore it contains the schedule of rehabilitation treatment through the surgical technique, general goal of the rehabilitation by phase, scales for outcome measure and postoperative infection management. Conclusions The proposal of this manual has a significance for it provides information about decision making process and contents of treatment in one medical institution for East-west integrative rehabilitation treatment after lumbar spine surgery.

• 센서학회지
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• 제14권2호
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• pp.116-124
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• 2005

In this paper range measurement systems are designed using an ultrasonic sensor and a camera. An ultrasonic sensor provides the range measurement to a target quickly and simply but its low resolution is a disadvantage. We tackle this problem by employing a camera. Instead using a stereoscopic sensor, which is widely used for 3D sensing but requires a computationally intensive stereo matching, the range is measured by focusing and structured lighting. In focusing a straightforward focusing measure named as MMDH(min-max difference in histogram) is proposed and compared with existing techniques. In the method of structure lighting, light stripes projected by a beam projector are used. Compared to those using a laser beam projector, the designed system can be constructed easily in a low-budget. The system equation is derived by analysing the sensor geometry. A sensing scenario using the systems designed is in two steps. First, when better accuracy is required, measurements by ultrasonic sensing and focusing of a camera are fused by MLE(maximum likelihood estimation). Second, when the target is in a range of particular interest, a range map of the target scene is obtained by using structured lighting technique. The systems designed showed measurement accuracy up to 0.3[mm] approximately in experiments.

• The Korean Journal of Pain
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• 제18권1호
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• pp.34-38
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• 2005

Background: Over the years, disc surgery has progressively evolved in the direction of decreasing trauma and its invasiveness. Conventional open surgery has many complications, such as scarring, instability, bleeding and a relative high mortality rate. Minimally invasive spinal surgery is now an alternative to a traditional discectomy. Herein, we present an operative technique, and the early results, for a percutaneous endoscopic lumbar discectomy in herniated lumbar disc disease. Methods: 43 patients, including 27 men and 16 women, with ages ranging from 18 to 66 years, were enrolled in this study. All the patients showed a protruded or extruded soft disc herniation at the lumbar level on magnetic resonance imaging and computed tomography. A percutaneous endoscopic lumbar discectomy was applied to the patients, and clinical responses evaluated using MacNab's criteria. Results: 40 patients were regarded as showing successful responses (93.1%), and there were no severe complications, such as a hematoma, nerve injury, postoperative dysesthesia or death. One patient underwent fusion surgery for remnant back pain six month later. Conclusions: We conclude that, in properly selected patients, a percutaneous endoscopic lumbar discectomy is a safe, noninvasive and effective treatment modality for herniated lumbar intervertebral disc disease.

• 한국정보처리학회논문지
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• 제6권2호
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• pp.307-314
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• 1999

본 논문에서는 순차 언어로 작성된 프로그램을 '병렬화'와 지역성 향상'을 목적으로 변형시키는 최적화 기법에 대해서 논의한다. 의존성과 지역성을 고려하여 순차 프로그램의 루프 구조를 분석하고, 루프 분산과 루프 병합 기법을 적용하여 프로그램을 변형시킨다. 이 변형된 프로그램은 쉽게 '굵은 단위'의 병렬성과 지역성이 향상된 형태의 쓰레드 프로그램으로 표현될 수 있다. 따라서 이 변형 기법은 최적화/자동병렬화 컴파일러 구현에 유용하게 응용될 수 있다. 4개의 SPARC 프로세서를 장착한 Solaris 시스템에서 이 기법을 SPEC95 프로그램에 적용하여 시험한 결과 순차프로그램과는 20∼62%, 기존의 SUIF 병렬화 컴파일러와는 3∼12% 정도의 수행시간이 개선되는 효과를 얻게 되었다.