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IEEE 802.22 WRAN 시스템을 위한 OFDM 프리앰블 설계 및 동기 알고리즘
원재연,심성보,김윤희 경희-다반 ASIC 설계교육센터 2006 경희-다반 ASIC센터 논문집 Vol.7 No.-
IEEE 802.22에서는 사용하지 않는 TV 대역을 찾아 고정 사용자에게 고속 패킷 전송을 제공하는 WRAN 시스템을 논의하고 있다. 본 논문에서는 WRAN 시스템을 위해 단일 프리앰블을 이용한 시간 및 주파수 동기 알고리즘을 제안하고 WRAN에서 고려하는 무선 채널 모형에서 성능을 살펴본다. 제안한 알고리즘은 기존의 시간 동기 메트릭을 간단히 수정하여 시간 동기를 좀 더 안정적으로 찾을 수 있도록 함으로써, 시간동기후에 수행되는 주파수 옵셋 추정기의 성능을 향상시킨다.
尹世重,金在炫,崔錫源 공주대학교 사범대학 과학교육연구소 1984 과학교육연구 Vol.16 No.1
A Computer program which could be used for teaching material in new curriculum of highschool earth science course was programed with Goldstar Co. model FC-100 personal computer in BASIC language. The main contents of this program are calculation of radius, mass, average density, the acceleration of gravity of earth and evidences for rotation of earth etc. All these substances are explained with Korean or English and by means of derivation of formula, calculation or dynamic graphs.
원윤재 한국기술교육대학교 1999 論文集 Vol.6 No.1
This study presents a method to obtain the optimal heat input schedule for maintaining a regular weld pool size in a pipe peripheral welding. By using a weld thermal analytical model, the effects on pool size in the case of constant heat input are investigated in a pipe peripheral welding, and the results show irregular pool size at the weld starting and terminating areas. The variable heat input schedule having the minimum value, while maintaining a regular pool size, is obtained by constructing a linear programming problem.
人工知能 技術의 發展추세 分析과 우리나라 컴퓨터 산업에의 應用展望
尹載殖,金元燮 全北大學校 1987 論文集 Vol.29 No.-
Artificial intelligence(AI) is the study that makes the intelligent computer resembled human being. In this paper, we deal with the studying objects of Al classified fundamental field and application field, then we consider the application systems and the development trends of AI. Also, this paper described the application prospects of AI and formulated a set of measures to the computer industry in Korea, based on the application system and the development trends of AI.
원윤재 한국기술교육대학교 1998 論文集 Vol.5 No.1
In this study, an improved weld thermal analytical model is proposed to effectively estimate weld pool shape and size for gas metal arc welding (GMAW) processes. In the model, heat input effect by molten droplet is considered by adopting the second heat distribution heat source. The performance of the model is verified through comparisons between the simulation and experimental results obtained at various welding conditions, and the model provides good performance for estimation of the weld pool. As a result, the model can be used as an effective analysis tool for welding process control.
소정원,이광희,라지영,안소연,김윤희,반재혁 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.1
Ectopic eruption is caused by an abnormal direction of eruptive path, most common in maxillary first molar, mandibular lateral incisor, and maxillary canine, and sometimes mandibular first molar. Ectopic eruption of first molar leads to abnormal root resorption of second deciduous molar, which, if left untreated, could cause premature loss of second deciduous molar; mesial tilting and rotation of first permanent molar; lack of space for eruption of second premolar; and occlusal problems. Therefore early treatment is advised when diagnosed as ectopic eruption. Treatment of ectopic eruption in the first permanent molar involves providing proper guidance for the direction of eruption using interproximal wedging and distal tipping methods while preserving second deciduous molar. This case report shows satisfactory results of the ectopic eruption of mandibular first molars in young patients who were treated with Humphrey appliance and Halterman appliance. 이소맹출은 치아가 비정상적인 위치로 맹출하는 경우를 말하며, 주로 상악 제1대구치, 하악 측절치, 상악 견치에서 발생하며 하악 제1대구치에서는 드물게 발생한다. 제1대구치의 이소맹출은 흔히 제2유구치의 비정상적인 치근흡수를 야기하며, 이를 방치하게 되면 제2유구치의 조기상실, 제1대구치의 근심경사 및 회전, 제2소구치의 맹출 공간 부족 및 교합문제 등을 야기하게 되므로 이소맹출로 진단될 경우 조기 치료가 추천된다. 이소맹출은 대개 통상적인 방사선검사를 통해 발견되나, 간혹 제2유구치의 치근흡수가 심할 경우 치수가 감염되어 동통을 야기하는 경우도 있다. 이소맹출의 치료는 제2유구치를 보존하면서 제1대구치의 맹출 방향을 바로 잡아 주는 것으로 크게 치간이개(interproximal wedging)와 원심경사이동(distal tipping)을 이용한 방법을 사용한다. 본 증례들은 하악 제1대구치의 이소맹출을 보이는 환아들로, Humphrey appliance와 Halterman appliance를 이용하여 양호한 치료 결과를 얻었기에 보고하는 바이다.
윤해동,황원택,김재수 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1
With rapidly industrial development, a railway has become of a main traffic means. But, the railway noise has caused much annoyance for the residents living nearby railway tracks. The result has been indiscreet installation of soundproof walls. But, even after soundproof walls were installed, the residents in the area would complain about the railway noise. In this study. The characteristics of Propagation and Attenuation of railway noise were compared among regions where the Honam Line travels. For this focus, the characteristics of sound field distribution of the soundproof walls in the area were investigated, and the results were supposed to serve as a basic data for effective and rational noise prevention measures.
공침범으로 제조한 마그네시아 부분안정화 지르코니아 소결체의 특성에 미치는 열처리 효과
이재원,오응주,정윤중,이형복 明知大學校 産業技術硏究所 1989 産業技術硏究所論文集 Vol.8 No.-
The powder of ZrO₂-MgO systems prepared by co-precipitation method using ZrOCl₂· 8H₂O and MgCl₂· 6H₂O as the sintering materials. They are sintered and than heat treated to know that effects of agoing time and temperature on mechanical and electrical properties. The powder ZrO₂-MgO systems have∼30nm crystal size and tetragonal phase. The mechanical properties of these partially stabilized ZrO₂- MgO specimens are shown the best value when they are aged at 1,100℃ for 1 hr and at 1,450℃ for 10 hrs, but these are better than those, and while the specimens of 9.5 mole% in these thermal conditions. Electrical conductivities are measured as a function of temperature in the range of 500℃ to 1,000℃. The temperature dependence of electrical doncutivities is shown the activation energies by the heat reat conditions; no heat treating, heat treating at 1,100℃ for 1 hr, and heat treating at 1,450℃ for 10 hrs, and their values are 21.5㎉/㏖, 34.3㎉/㏖, and 43.5㎉/㏖, respectively.