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.

Cytomegalovirus Retinitis After Intravitreous Triamcinolone Injection in a Patient with Central Retinal Vein Occlusion

Yong­Sik Park,Suk Ho Byeon 대한안과학회 2008 Korean Journal of Ophthalmology Vol.22 No.2

To report a case of cytomegalovirus (CMV) retinitis after intravitreal injection of triamcinolone acetonide (IVTA). A 77-year-old woman with macular edema due to central retinal vein occlusion (CRVO) developed peripheral retinitis 4 months after IVTA. A diagnostic anterior chamber paracentesis was performed to obtain DNA for a polymerase chain reaction (PCR) test for viral retinitis. The PCR test was positive for CMV DNA. Other tests for infective uveitis and immune competence were negative. Four months after presentation, gancyclovir was intravitreously injected a total of 5 times, and the retinitis resolved completely. CMV retinitis is a rare complication of local immunosuppression with IVTA. It can be managed with timely injection of intravitreal gancyclovir until recovery from local immunosuppression.

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.

방사선사진의 인덱스-순서 분석을 통한 치아경조직의 탈염화 검출

박동현,박영호,김경숙,박정훈,이기자,최삼진,최용석,황의환,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.2

Purpose : The purpose of this study was to develop the radiographic technique for detecting the demineralization which is known as indication of dental caries. Materials and Methods : This technique was based on the comparing of multiple radiographs which was irradiated by multiple X-ray spectra. For the meaningful comparing, the multiple radiographs were reconstructed to the dosimetrically consistent images using a standard material. The difference of resulting images of same target with multiple spectra represents the difference of response of material as regards the spectra. Results : We have found about 10% of demineralization of dental hard tissues particularly in the proximal region through the analyzing of differences. Conclusion : Most intriguing thing in this investigation was that the method to analyze difference shows us to an anatomic structure of dental hard tissues even if absolute values of optical density were excluded during the procedures.

연령증가에 따른 혈압요소들의 좌심실비대 및 관동맥질환과의 관련성

박재석,박창규,박미영,박재형,김용현,나진오,신성희,서순용,홍순준,박성미,임홍의,김응주,서홍석,오동주,노영무 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.2

경주지역 여고생의 초경과 체성장간의 관계

김준섭,권오구,박진석,오종수,박정현,박제식,안세한,이용환,서정호,신태섭,최영배,김덕수,이관,박수경 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1

본 연구는 경주지역 1개 고등학교 3학년 여고생을 대상으로 초경 시작 전인 초등학교 4학년부터 고등학교 2학년까지의 키, 몸무게, 가슴둘레 수치와 초경 연령을 파악하여 여성의 초경이 빠를수록 체성장 속도의 변화가 있을 것이라는 가설을 기초로 두 요인간의 관련성을 파악하고자 시행되었다. 경주시 1개 여자고등학교 3학년생 총 317명에 대해 ㅊ경 나이, 초경시 심리 상태, 초경이 시작되었을 때의 상담 여부와 상담하였던 사람, 부모 신장과 초경전후의 식사 규칙성, 다이어트 경험, 수면시간, 스트레스, 음주/흡연 여부, 질병력 등에 대한 설문 조사를 시행하였고, 초등학교 4학년부터 고등학교 2학년까지의 키, 몸무게, 가슴둘레에 대한 정보는 건강기록부에서 확보하였다. 상기 대상자 중 건강기록부가 분실된 39명, 초경나이에 대해 응답하지 않았던 29명 및 결석 등으로 조사를 하지 못하였던 42명을 제외한 조사 대상자는 206명으로 선정하였다. 대상자들의 초경연령 평균값(Mean±SD)은 13.0±1.11이었고, 초등학교 4학년부터 고등학교 2학년까지의 초경 이후 신장 성장률은 감소하였으며, 초경연령이 빠른 군이 초등학교 때는 신장에 있어서 우위를 차지하나 고등학교에 오면서 신장은 비슷한 수준이 되었다. 초경후 1-2년 사이에 체중과 흉위의 증가율은 감소하였고, 초경연령이 빠른 군이 초등학교와 고등학교 사이에 체중과 흉위에서 모두 우위를 차지하였다. 본 연구의 결과는, 흔히 이차 성징의 시작 시점 혹은 사춘기의 시작 시점으로 보고있는 초경 연령이 청소년기의 성장과 밀접한 관련성이 있고, 특히 체중과 흉위의 성장 속도와 밀접한 관련성이 있음을 시사한다. To understand the onset of menarche in relation to changes in physical growth that take place during female adolescence, especially the changes in height and weight velocity. The 207 senior in one women high school of Kyongju were investigated in April 3 to 8, 2001. We collected the information, relation in the age at menarche, height & weight of parents, regularity of eating, and obesity diet, duration of sleeping, sickness & stress near age at menarche, by self-recording. The status of height, weight & chest circumference between the 4th grade of primary school and the junior of high school was collected by individual Health Record. The results were followed; The average age at menarche was 12.95±1.11 years old and the most frequent age of menarche is 13 years. After menarche, the velocity of height, weight and chest circumference were decreased. The most rapid group of menarche hold dominant position in height during elementary school. As time passed, they dont hold dominant position in height. The most rapid group of menarche get an advantage in the weight and the girth of chest after elementary school. The height of subjects is directly proportional to the height of their parents. These results suggest that the starting age at menestuation can be closely associated with physical growth and development.

전통적 유전자 알고리즘에 의한 복합재료 구조물의 최적 설계

박정선,이수용,류석규 한국 항공대학교 항공산업기술연구소 1999 航空宇宙産業技術硏究所 硏究誌 Vol.9 No.-

유전자 알고리즘에 의해서 복합재료 구조물을 최적화 시켜 보았다. 유전자 알고리즘은 이산 변수를 고려할 수 있기 때문에, 설계 변수가 적층수와 적층각도 같은 이산 변수인 경우에서는 전통적 최적화 방법보다 정확한 최적값을 구할 수 있다. 유전자 알고리즘의 이러한 특성을 연구해 보기 위해서, 전통적 최적화 기법의 일환인 modified method of feasible directions (MFD)에 의해 복합재료 구조물을 최적화 시켜 보고 유전자 알고리즘에 의한 최적값과 비교, 분석해 보았다. 본 연구의 해석결과 유전자 알고리즘이 MFD보다 목적 함수에서 우수한 값을 나타낸다는 것을 알 수 있었다. In this study, a composite structure is optimized by using Genetic Algorithm (GA). Discrete variable scan be considered in GA. The GA is able to find better optimum than the classical optimization methods in considering design variable such as ply number and ply angle(orientation). To study the characteristics of the GA, a composite structure is optimized by the modified method of feasible directions (MFD) and GA. The results are compared and discussed. This result show that the GA provides better optimal results than MFD in the objective function value.

공장 업무자동화를 위한 분산처리 시스템의 개발

박두순,공용해,오동익,정종석,오은숙 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

(주)한길은 콘크리트 2차 가공 업체로서, 주로 벤치플륨, 맨홀, 수로관, PC암거박스 등을 생산하고 있는 중소기업이다. 이 업체는 제품의 특수성과 생산 시설의 규모로 인하여 납품 계약 후에 미리 적정량을 생산하여 재고로 보유하면서 제품을 적기에 납품해야 한다. 그러나 현재 입고, 재고, 출고 관리 등의 업무전산화가 이루어져 있지 않을 뿐만 아니라 생산, 저장, 관리가 동일한 장소와 더불어 지역적으로 분리된 곳에서 이루어지고 있어 정보관리에 많은 어려움을 겪고 있다. 이에 본 연구에서는 근거리 네트워크와 전화접속 네트워크를 혼합한 하이브리드 형태의 분산 환경 시스템을 구축하여 경제적으로 가장 최적인 네트워크 솔루션을 제공하고, 이를 바탕으로 하는 입고, 재고, 출고 관리 시스템과 기본적인 회계 등의 전산 업무를 개발하여 업체의 생산성 및 경쟁력 향상을 도모하고자 한다.

Diphenyl(N'-hydroxymethyl)ureidophosphonate의 합성과 면섬유에 대한 방염성

박주연,조용석 대구효성가톨릭대학교 응용과학연구소 1994 응용과학연구논문집 Vol.3 No.-

This is a study for a new flame retardant, Diphenyl(N'-hydroxymethyl)ureidophosphonate(DPHMUP), made from phosporous compound and urea. By the introduction of urea, it is expected that the new flame retardant has better flame re-tardancy and durability particularly on cotton fabric than other phosporous based flame re-tardants, since in urea nitrogens are contained. For he examination of the effectiveness of the flame retardancy of the new flame retar-dant the flame retardancy of cotton fabrics treated by DPHMUP through PDC process was examined. Further, in order to figure out the physical property change of the DPHMUP pro-cessed cotton fabrics, the change of drape stiffnesses, the wrinkle recoveries, and the tensile strengths, were examined. The results of this study are summarized as follows : (1) A new flame retardant, DPHMUP, for cotton fabrics was synthesized by an effective and economic method without using pyridine or tetiary amine for the removal of HCl (2) The cotton fabrics which is treated with DPHMUP has been found to have better flame retardancy than other already existing phosporous based flame retardants. (3) The optimum condition for PDC process found is that the curing temperature is 160℃, the DPHMUP concentration is 30%, and the fixing agent hexamethylolmelamine (HMM)/DPHMUP weight ratio is 1/8. (4) The drape stiffness and the wrinkle recovery of the processed fabrics increase with in-creasing DPHMUP concentration. (5) When cotton fabrics processed by the weight ratio 1/8 of HMM/DPHMUP solution, the tensile strength decreases, while the decreasing rate of the tensile strength retention ratio increases with increasing DPHMUP concentration.

Benzanilide類의 光化學

朴龍泰,黃正儀,鄭倧在,呂壽東,洪錫 慶北大學校 文理科大學 1979 文理學叢 Vol.6 No.-

Several model compouds for photocyclization of alkaloids were synthesized. When benzanilide was irradiated with UV lamp in quartz photocell, surprisingly 2-aminobenzophenlone and 4-aminobenzohpenone were produced as a Photo Fires reaction, However, when the benzanilide was irradiated in Pyrex photocell, the expected photoclic-compound, phenanthridone was appeared. Orthosubsitituted benzanilides in Pyrex photocell also gave 8-subsituted-9-oxy-phenanthridines. Thus, the dihydrophenanthridone was assumes as intermediate of the photocyclization of benzanilides as model for alkaloid photocyclization reaction.