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반응경로 모델링을 이용한 결정질암 지하수의 지구화학적 진화경로 예측
성규열,박맹언,고용권,김천수 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.1
화강암지역에서 산출되는 국내 지하수의 화학조성은 주로 Ca-HCO_3와 Na-HCO_3, 형에 속하며, 일부는 Ca-(CI+SO_4) 또는 Na-(CI+SO_4)형의 특성을 나타낸다. 회장암 지역의 용출수는 Ca-HCO_3형에, 지하수는 Na-HCO_3 형에 도시된다. 빗물-화강암 반응에 대한 반응경로 모델리 결과는 초기 Ca-CI형에서 시작하여 Ca-HCO_3을 거친 후, 최종적으로 Na-HCO_3형으로 진화하는 경향을 보인다. 빗물-회장암 반응 역시 빗물-화강암 반응에서와 유사하게 진화되는 경향을 보이며, 모델링 결과는 현장자료와 잘 일치된다. 빗물-화강암/회장암 반응경로 모델링 결과, 반응이 진행됨에 따라 수소이온 활동도는 점차 감소(pH는 증가)하며, 양이온의 농도는 pH의 변화에 따른 모암을 구성하는 광물들의 순차적 용해, 2차 생성광물의 침전 및 재용해 등에 의해 다양한 농도변화를 보여준다. 빗물-화강암의 반응비에 따라 깁사이트, 적철석, 망간산화물, 카오리나이트, 실리카, 녹니석, 백운모, 방해석, 로몬타이트, 프레나이트, 아날심의 순으로 침전이 발생하며, 빗물-회장암의 반응에서도 이와 동일한 침전순서를 보이지만 실리카의 침전이 없고 아날심 대신 파라고나이트가 침전된다. 빗물-화강암 반응에서는 실리카가 가장 우세한 광물이며, 빗물-회장암 반응에서는 카오리나이트가 가장 우세한 광물이며, 전체적인 2차 생성광물의 침전량은 화강암보다 회장암 반응이 더 우세하다. The chemical compositions of groundwaters from the granite areas mainly belong to Ca-HCO_3 and Na-HCO_3 type, and some of these belong to Ca-(CI+SO_4) type. Spring water and groundwaters from anorthosite areas belong to Ca-HCO_3 and Na-HCO_3 type, respectively. The result of reaction path modeling shows taht the chemical compositions of aqueous solution reacted with granite evolve from initial Ca-CI type, via Ca-HCO_3 type, to Na-HCO_3 type. The result of rain water-anorthosite interaction is similar to evolution path of granite reaction and both of these results agree well with the field data. In the reaction path modeling of rain watergranite/anorthosite reaction, as a reaction is progressing, the activity of hydrogen ion decreases(pH increases). The concentrations of cations are controlled by the dissolution of rock-forming minerals and precipitation and re-dissolution of secondary minerals according to the pH. The continuous addition of granite causes the formation of secondary minerals in the following sequence; gibbsite plus hematite, Mn-oxide, kaolinite, silica, chlorite, muscovite (a proxy for illite here), calcite, laumontite, prehnite, and finally analcime. In the anorthosite reaction, the order of precipitation of secondary minerals is the same as with granite reaction except that there is no silica precipitation and paragonite precipitates instead of analcime. The silica and kaolinite are predominant minerals in the granite and anorthosite reactions, respectively. Total quantities of secondary minerals in the anorthosite reaction are more abundant than those in the granite reaction.
성한용,김규칠,방철원,김용석 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.B
It becomes common to use computers to control electronic devices and security facilities in newly constructed buildings and house. There are many home application devices in the market which can be controlled by computers. But they are expensive and managed by specialized companies. This paper is focused on personal computers which are available in most homes and can be used to control home electronic appliances and home security facilities. We implemented a home automation server based on Linux. The standard parallel port of personal computer is used to connect sensors and actuators. Therefore, the cost of the server is very low. Moreover, the server is connected to Internet and anywhere we can control and monitor the home security facilities and home automation systems.
최성규, 서대석 영남대학교 사회과학연구소 2000 社會科學硏究 Vol.20 No.1
본 연구는 재량적 회계변경에 대한 자본시장의 반응을 검증하기 위한 5개의 가설을 제시하고 이를 실증하였다. 이 가설들의 기본 논리는 대부분의 재량적 회계변경이 회계정보의 유용성을 증가시키기보다는 기업의 재무상태와 경영성과를 유리하게 보이기 위한 경영자의 기회주의적 유인이 더 많이 작용했을 것이라는 데 초점을 맞추고 있다. 가설을 검증하기 위하여 재량적발생에 대한 반응계수를 살펴보았으며, 검증결과, 가설과 일관된 결과를 얻을 수 있었다.
성일용,류성호,신상훈,김욱규,김종렬,정인교,변기정 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.1
The authors analyzed retrospectively the 60 patients with ameloblastoma who were treated at Department of Oral and Maxillofacial Surgery, Pusan National University Hospital from MArch, 1990 to December, 1995. The results obtained were as follows: There were 26 males (43.3%) and 34 females (56.7%). The peak age of patients was the third decade (41.7%). The majority of cases occurred in the mandible 93.3%, especially in the angle region (91.1%). Eighteen of 60 patients (30.0%) were associated with an impacted tooth, by impacted 3rd molar teeth (16.6%), molar (10.0%), and premolar and canine (3.4%) in order., Fifteen of 60 patients (25%) were associated with an odontogenic cyst, by dentigenous cyst(13.3%), odontogenic keratocyst(8.4%), and radicular cyst(3.3%) in order. Radiographically, there were 32 unilocular types(54.2%) with average age of 24.9±10.8 years, 14 multilocular types(23.7%) with average age of 35.7±17.7 and 13 mixed types(22.0%) with average age of 41.4±15.8. Histopathologically, there were 42 follicular types(70.0%) with average age of 33.7±15.1 years and 18 plexiform types(30.0%) with average age of 26±14.6. Conservertive treatment was performed in the 33 patients(55.0%) and their average age was 25.2±13.9 years and radical treatment in the 27 patients(45.0%) and their average age was 39.3±41.8. Overall recurrence rate was 10%. A consistent correlation between the age of the patient and the radiographic or histologic type of mandibular ameloblastoma was observed. There was a tendency for ameloblastomas of the follicular type to show a multilocular or mixed appearance and for those of the plexiform type to show a unilocular appearance.
성윤경,이규태 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1
The paper presents the modeling and optimal control for the reduction of transverse vibration of simply supported beam under a moving mass. The equations of motion are derived by using assumed mode method. The coriolis and centripetal accelerations are accommodated in the equations of motion to account for the dynamic effect of the traveling mass. In order to reduce the transverse vibration of the beam, an optimal controller with full state feedback is designed based on the linearized equations of motion. The optimal actuator locations are determined with the evaluation of an optimal cost functional defined by the worst initial condition with the trade-off of controlled mode performance. Numerical simulations are performed with respect to various velocities and different traveling masses. Even if the velocity of the traveling mass reaches to the critical speed which can cause the resonance of the beam, the controller with two piezoelectric actuators shows the excellent performance under severe time-varying disturbances of the system.