Linear Combination Analysis Using GPS Data

Park, Woon-Yong,Lee, Dong-Rak,Back, Ki-Suk,Hong, Jung-Soo 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2

We can process and compute the position, velocity and time by satellite signals of GPS. The signals are used to compute positioning of three dimensions and timing offset of the receiver clock when we can track the tour satellite signals at least. One of the specified aims is to use less expensive single frequency code/carrier phase GPS receivers, which are typically around half the price of dual frequency receivers. In the study, the author analyzed the accuracy and applicability of frequence linear combination using triangulation points evaluated distance limitation.

Accuracy on the Edge Detection of Topography for Digital Map Manufacture

Park, Woon-Yong,Song, Youn-Kyung,Bae, Kyung-Ho,Kim, Yong-Suk 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.28 No.2

Currently, digital maps in the metropolitan area are supposed to be revised and renewed every two years, but it is difficulty for the renewal of current information to keep pace with the quickly changing society and so, one of the alternative methods being discussed is a digital map produced using high resolution satellites. The biggest problem in the production of digital maps using high resolution satellite images is the difficulty of production in vector resource format through edge detection of satellite images, a Raster data. In this study, topographical boundaries were detected through edge detection of the satellite image, and after vectorliezing using the screen digitizing method, the results were evaluated and compared to the digital map from the NGII(National Geographic Information Institute) for accuracy.

RTK GPS를 이용한 구조물 모니터링 시스템의 구축

박운용,김진수,안상준 동아대학교 건설기술연구소 2003 硏究報告 Vol.27 No.1

Such social infrastructures as bridges. buildings, dams and towers have been transformed by their own load or by their fundamental ground, or they have been behaved by other external causes. These regular of irregular behaviors threaten to break up themselves or to do their users harm. Therefore, to monitor the load of the structures or reaction shown by them could help to verify their behaviors. RTK GPS allows the use of a static base station and remote rover unit(s) to allow for data collection within several seconds and in real time. Among GPS methods, first of all, we used RTK GPS to analyze the precision of monitoring and then on the basis of it, we developed a monitoring system using RTK GPS when we measured the behavior of main tower of Hyoun-Soo Gyo by using RTK GPS method and IMU, which was an inertia navigation system. Comparing a deviation between observation value using IMU and RTK GPS, X axis was 1㎜, Y axis 1㎜ and z axis 2.2㎜. It turned out that it was possible to monitor and measure structures by RTK GPS method. Besides, in order to manage the structures and prevent their disaster, the transformed monitoring, which used dynamic RTK GPs measurement method, was applied in real time. It was applied in real time. It was verified that it could be used as transformed monitoring measurement method for massive structures.

염색공업단지 폐수처리장의 유입폐수 특성

박영규,이철희,양용운 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.15 No.2

요 약 문대구 D염색공단의 대표적인 염색가공업체에서 유출되는 폐수와 공단처리장에 유입되는 1 년간(1994. 1-1994. 12) 종합폐수의 수질 및 오염부하변동을 조사하였다.Polyester감량업체의 연평균 BOD 3,112㎎/ℓ , CODMn l,402㎎/ℓ이고, COD/BOD비는 0.34이 였으며, 면 T/C업체의 연평균 BOD 885㎎/ℓ, CODMn 676㎎/ℓ이고, COD/BOD비는 0.76이 였 다. (그리고 Nylon업체의 연평균 BOD 582㎎/ℓ, CODMn 376㎎/ℓ이고, COD/BOD비는 0.65 이였으며, 나염 관련업체의 COD/BOD비는 1.18이였다. )공동폐수처리장에 유입되는 유량의 78%가 50,000 ㎡/day∼60,000㎡/day이였으며, 연평균 수온은 35tC, pH는 11.6∼12.9 범위이고, 부유물질은 92㎎/ℓ 이였다. 공동폐수처리장에 유입 되는 연평균 BOD 및 COD Mn은 각각 1,824mg/ℓ, 760mg/ℓ이고, COD/BOD비는 0.42이였다. 연평균 BOD 및 CODMn 부하량은 각각 107,616kg/day, 45,O17kg/day이고, 이중 부하량 분포 에서 BOD는 80,000∼90,000kg/day 범위가 약 31 %, CODMn은 45,000∼50,000 kg/day 범위가 약 63%로 가장 많은 빈포를 차지하였다. 전체적으로 BOD 부하량는 60,000∼110,000kg/ day 분포가 약 81 %, CODMn 부하량은 40,000∼55,000 kg/day 분포가 약 92%이 였다. Abstract The wastewater discharged from several major dyeing processing industries and the mixed influent wastewater in Taegu D dyeing industrial complex were investigated for a year (1994. 1 ∼ 1994. 12) in order to evaluate the fluctuation of pollutant 1oadings.Average wastewater qualities from the polyester processing were BOD 3,112 mg/ℓ and CODMn l,042 mg/ℓ and those from the cotton T/C processing were BOD 885 mg/ℓ , CODMnMn 676 mg/ℓ and COD/BOD ratios were 0.34 and 0.76, respectively. An addition, average wastewater qualities from the pylolyester processing were BOD 3,112 mg/ℓand CODMn 736 mg/ℓ and COD/BOD Fatio was 1.18 from the printing processing,Flow rate of 78 % at dyeing industrial complex wastewater treatnlent plant was found to be on the range of 50,000㎡/day∼ 60,000㎡/day and the average mixed wastewater qualities were characterized as water tempereture 35℃, pH 12.1, suspended solid 92 mg/ℓ , BOD 1,824 mg/ℓ and CODMn 760 ㎎/ℓ.Average BOD and CODMn loadings were l07,616 kg/day,45,017 kg/day, respectively. About 31% of daily BOD loadings fell on the range of 80,000∼90,000 kg/day and about 63% COD Mn 1oadings did on the range of 45,000∼ 50,000 kg/day, which showed the most frequent range. And about 81 % of total BOD loading was found from 60,000 to 110,000 kg/day and about 92% of total CODMn loading ranged from 40,000 to 55,000 kg/day.

KOMPSAT-1 EOC영상을 이용한 정사영상생성의 정확도 향상

박운용,이현우,정공운 東亞大學校 建設技術硏究所 2001 硏究論文集 Vol.25 No.2

KOMPSET -l(Korea Multi - Purpose SA Tellite-1) Platformed EOC(Electro –Optical Camera) could collect high resolution images of 6.6m during photograph, it possible for get on tilt image on the lean about 45 degrees on satellite body. According as, it has possibility that we take a photographing pair of tilt image about same place from two of different orbits. KOMPSA T-1 sensor of mission is the Korean map drawn on a scale of 1: 25,000 image becoming. Following study, KOMPSAT-1 platformed automate feature extraction and using of stereo satellite image, it certify interpret through reducing influence of sensor, rid of preprocessing, also, we intend to discuss ortho-images production of appropriateness. Because of this study, we conclude to the next in that fact. The case make use of 6, 7, 9 of ground control point evenly spread, 3-D positioning possible about horizontality, verticality of location as a 95% of reliance rate ,in case nine of ground control point, RMSE 6.0752m, 9.8274m. In case of ortho-image RMSE 17.568m, elevation error become 36.82m. Elevation accuracy is inferior as compare with positioning accuracy. Because it analyzed by image matching problem.

디지털 카메라의 자체검정을위한 도심측정방법과 타원 피팅 방법의 정확도 분석

박운용,정공운,송연경 東亞大學校 建設技術硏究所 2002 硏究論文集 Vol.26 No.1

Digital high-resolution consumer cameras are widely available, and are increasingly used in close-range photogrammetry. The mechanical construction of the cameras often do not meet photogrammetric requirements, thus they have to be modelled sufficiently. An approach for camera modelling is discussed that introduces image-variant parameters of interior orientation. In addition a correction model based on finite elements is integrated that provides the correction of remaining errors in the sensor space. All functional parameters are estimated simultaneously in a bundle adjustment. Significant improvements of object accuracy have been achieved with respect to standard calibration techniques based on self-calibrating bundle adjustment. Rollei d7 metric 디지털 카메라를 이용하여 촬영조건의 다양한 변화에 따른 위치오차를 분석하며 대상물표면에 설치된 타켓의 3차원위치를 결정하기 위해 도심측정방법과 타원 피팅 방법으로 타켓중심을 구하였다. 각 타켓의 변위를 측정하고 3차원 정확도를 분석한 결과 다음과 같은 결론을 얻었다. 도심측정방법과 타원 피팅 방법을 여러 가지로 조합하여 적용한 결과 평균표준오차는 타원 피팅 방법과 도심측정방법을 동시에 적용되었을 경우 X좌표에서 ±0.478mm, Y좌표에서 ±0.478mm, Z좌표에서 ±0.478 mm로 가장 낮은 오차를 보였다. 도심측정방법은 타켓의 모양에 구애받지 않으나 적절한 임계값의 결정이 중요하며 경중률 을 고려함으로써 이를 보완할 수 있었다. 반면에 타원 피팅 방법은 타켓의 형상이 수학적으로 피팅 할 수 있는 형상이어야 한다는 점은 불편하나 임계값 영향을 받지 않았다. 자체 검정기법에 의한 촬영조건의 다양한 변화에 따른 위치오차를 분석하여 Rollei d7 metric 디지털 카메라의 기하학적 지식 및 수행성을 평가하기 위하여 내부표정요소 및 렌즈 왜곡 등에 관련된 기하학적 검정 매개변수들을 도출해 낼 수 있었으며 높은 정확 도 를 나타냄으로써 근거리 지상사진측량시스템 의 잠재성을 확인할 수 있었다. 자체검정 광속조정은 카메라의 계통적 오차들을 효과적으로 보정해줌으로써 정확도를 크게 향상시킬 수 있었다. 따라서 자체검정 기법을 적용하는 디지럴 카메라에 의한 광학적 근거리 지상사진측량시스템은 산업의 차원적 품질 검사,문화재의 3차원 모델링 및 형상재현 등을 효율적으로 구현하여 대상물의 시각적 분석에 활용할 수 있을 것이다.

JPEG 압축 이미지를 이용한 수치사진측량의 정확도

박운용,곽두호,정성모,김천영 동아대학교 건설기술연구소 2001 硏究報告 Vol.25 No.1

The aim of our research is to find out how digital photogrammetry responds to image compression. Specially, we wish to know if using JPEG image compression leads to loss of accuracy in DTM derived by digital methods. We first review JPEG compression, and since we use the PCI OrthoEngine Airphoto Edition v6.3 digital phtogrammetry software, we briefly review it's principle of principle of operation. We use knowledge of the effect of JPEG compression on the geometric accuracy of images to predict the influence of compression on DTM accuracy. We then compare this to estimates derived from actual measurements. We find that the actual effect om DTM accuracy is greater than predicted, and consistent with geometric error due to compression in the region of 0.33 pixel.

외과적 보조의 급속상악확장술 : 치험 5예 REPORT OF 5 CASES

박충열,이용욱,송종운,김영운,박홍주,오희균,유선열,이기현,황현식 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1

Five adults (3 cases of bilateral posterior crossbite, 2 cases of unilateral posterior crossbite) with intermaxillary discrepancy of over 5㎜ due to maxillary transverse deficiency were treated by surgically assisted rapid maxillary expansion (SARME). Bilateral maxillary horizontal osteotomies, osteotomies of pterygomaxillary junction and anterior lateral nasal wall, ans anterior palatal osteotomy were performed in 4 cases, and unilateral osteotomies in 1case, followed by palatal expansion with tooth-borne orthopedic applicance. No significant complication was observed. The mean palatal expansion was 7.2㎜ (5.8∼10.0㎜) in the maxillary first molar region. During the mean follow-up period of 4 years (5 months∼8 years 7 months), no recurrence of crossbite was observed in all cases. The SARME seemed to be a simple, stable, and reliable procedure for achieving a permanent increase of over 5㎜ in skeletal maxillary transverse width of adults.

지형공간정보체계를 이용한 상수도 관로의 종합적인 운영관리에 관한 연구

박운용,신상철,김정동 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2

The urban expansion and the modernization of the urban infrastructure need a new technology to message water service. GSIS gears an efficient management of manpower, saving of time and cost for data accumulation, by processing and managing in the form of unified data. As various types of data accumulated in relation to the construction of the infrastructure facilities, which comes out after the rapid urbanization of the areas, we need a rational GSIS to avoid the duplication and confusion of data and data system. In this study, I intend to suggest a scheme for the efficient administration of the urban infrastructure facilities, based on GSIS for the efficiency of the acquisition and utilization of data. Also, I propose a program to manage the urban-related information more efficiently and to establish a more advanced system of database, by drawing up Digital Map using standard type to set up database.

실시간 스트림을 지원하기 위한 주문형 서버에서의 버퍼 공유 정책

박용운,홍규완 동의공업대학 2000 論文集 Vol.26 No.1

In this paper, we present a new buffer pool management scheme designed for video type news objects to build a cost-effective News On Demand storage server for serving users requests beyond the limitation of disk bandwidth. With our proposed buffer cache management scheme, a requested data is check to see whether or not it is worthy of caching by checking its average arrival interval and current disk traffic density, Subsequently, only granted news objects are permitted to get into the buffer pool, where buffer allocation is made not on the block basis but on the object basis. By using this caching policy, the frequently accessed objects are cached and then subsequent streams for those objects are serviced directly from the buffer pool, not contacting the disks where the original copies resides: this eventually leads to the construction of a storage server with relatively low costs.