산화탕그스텐 (주 (主) WO3) 입자의 생성 및 성장

안영필 대한금속재료학회(대한금속학회) 1963 대한금속·재료학회지 Vol.1 No.1

The formation of tungstic acid a nd the growth of tungsten oxides (mainly trioxide) by firing were studied with electronmicroscope, X-ray powder method and B. E. T. method. A white precipitate of tungstic acid was observed from an ammonium tungstate solution when dilute hydrochloric acid was used, on the other hand a yellow precipitate tungstic acid was obtained wnen concentrated hydrochloric acid was used. X-ray analysis showed that the crystal structure of the white tungstic acid was different from that of the yellow tungstic acid. The particles of white tungstic acid were smaller than those of yellow tungstic acid. Yellow tungstic acid obtained from calcium tungstate had the largest particle size, and was in a state of a spherical aggregate composed of needle crystals resembling to the calcium tungstate particles. These precipitates and ammonium paratungstate crystals were fired at various temperatures, 300, 400, 500, 600, 800, 1000 and 1230℃ for 2 hours. In electronmicroscopic method and B. E. T. method it was found that the sizes of particles were affected by the sizes and crystal structures of the tungstic up to 400℃. At 800℃ the particle size observed in the electronmicroscopic method was slightly affected by the particle size of the tungstic acid, whlie the specific surface measured by B. E. T. method had the same values. In the case of precipitate containing a trace of potassium, the growth of the praticles was promoted at all temperatures. The particles obtained from white tangstic acid, calcium tungstate and ammonium paratungstate were uniform in their size, but the particles from yellow tungstic acid were not uniform. When ammonium paratungstate was decomposed in vacuum, tungsten oxide was produced, the growth of the particles was quite different from that of tungsten trioxide particles.

Chelate Compounds 및 Complex Compounds 에 관하여 : Complex ions 을 중심으로

안영필 건국대학교 화공학회 1970 화공학회지 Vol.1 No.-

딥러닝 기반 임의적 스케일 초해상도 모듈을 이용한 Mask-RCNN 성능 향상

안영필,박현준 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.3

In instance segmentation, Mask-RCNN is mostly used as a base model. Increasing the performance of Mask-RCNN is meaningful because it affects the performance of the derived model. Mask-RCNN has a transform module for unifying size of input images. In this paper, to improve the Mask-RCNN, we apply deep-learning-based ASSR to the resizing part in the transform module and inject calculated scale information into the model using IM(Integration Module). The proposed IM improves instance segmentation performance by 2.5 AP higher than Mask-RCNN in the COCO dataset, and in the periment for optimizing the IM location, the best performance was shown when it was located in the ‘Top’ before FPN and backbone were combined. Therefore, the proposed method can improve the performance of models using Mask-RCNN as a base model. 인스턴스 분할에서 Mask-RCNN은 베이스 모델로 자주 사용된다. Mask-RCNN의 성능을 높이는 것은 파생된 모델에 영향을 미치기에 의미가 있다. Mask-RCNN에는 입력 이미지 크기를 배치 크기로 통일시키는 변환 모듈(transform module)이 있다. 이 논문에서는 Mask-RCNN의 성능 향상을 위해 변환 모듈의 크기 조정 부분에 딥러닝 기반 ASSR(Arbitrary-Scale Super-Resolution)을 적용하고, 스케일 정보를 모델의 IM(Integration Module)을 이용하여 주입한다. 제안하는 방법을 COCO 데이터세트에 적용하였을 때 인스턴스 분할 성능이 Mask-RCNN 성능보다 2.5 AP 높았다. 그리고 제안하는 IM 위치 최적화를 위한 실험에서는 FPN(Feature Pyramid Network)과 백본(backbone)이 결합하기 전의 ‘Top’ 위치에 배치했을 때 가장 좋은 성능을 보였다. 따라서 제안하는 방법은 Mask-RCNN을 베이스 모델로 사용하는 모델들의 성능을 향상시킬 수 있다.

2가 및 6가의 첨가제에 따른 PZT 자기의 유전적 성질에 관한 연구

안영필,이기옥 한국세라믹학회 1983 한국세라믹학회지 Vol.20 No.1

Dielectrics used as capacitor was studied in the system of $Pb(MgW)_{0.5} O_3-PbTiO_3-PbZrO_3$ Curie tempera-tures of $PbTiO_3 PbZrO_3$ and $Pb[MgW]_{0.5} O_3$ were 49$0^{\circ}C$ 23$0^{\circ}C$ and 39$0^{\circ}C$ respectively. When these materials formed solid solution the more amount of $Pb(MgW)_{0.5}O_3$ was increased the more Curie temperature lowered and dielectric constant increased. Higher dielectric constants were measured in the solid solution of which X-Ray diffraction patterns were changed. Especially Curie temperature and dielectric constant were 85$^{\circ}C$ and 4159 respectively in the composition of 60 $Pb(MgW)_{0.5}O_3-30 PbTiO_3-10PbZrO_3$. Also in this composition ferroeletric material with thermal stability was obtained.

$MnO_2$ 및 $Cr_2O_3$ 가 $Pb(Mg_{1/2}W_{1/2})_{0.3} Ti_{0.4} Zr_{0.3}O_3$ Ceramics의 압전성질에 미치는 영향

안영필,박종상 한국세라믹학회 1982 한국세라믹학회지 Vol.19 No.4

The effects of $MnO_2$ and $Cr_2O_3$ on the Piezoelectrictric properties of Pb(Mg1/2W1/2)0.3 Ti0.4 Zr0.3O3 Ceramics. Electromechanical properties in the system in connection with the sintering temperature and the effects of $MnO_2$ and $Cr_2O_3$ addition. The dielectric constant of the ceramics decreased with the additions of $MnO_2$ while the additions of $Cr_2O_3$ increased the value. The Planar coupling factor (Kp) of the ceramics with 0.2wt% $MnO_2$ and with 0.2wt% $Cr_2O_3$ gave the highest value of 0.52 and 0.513 as sintered at 106$0^{\circ}C$, 108$0^{\circ}C$, respectively. The value of mechanical Q-factor were in parallel with the fired density of the ceramics. The optical micrography of the sintered bodies showed that the additions of $MnO_2$ promoted the grain growth, while the additions of $Cr_2O_3$ retarded the grain growth.

교통신호등 제어를 통한 교통망 최적화 알고리즘

안영필,김동춘,나승권,An, Yeong-Pil,Kim, Dong-Choon,Na, Seung-kwon 한국항행학회 2017 韓國航行學會論文誌 Vol.21 No.5

본 논문에서는 네트워크 토폴로지 설계방법들(minimum spanning tree와 Dijkstra algorithm)을 사용하여 교통 격자 가로망을 최적화 하는 방안을 다루며, 최소신장트리(minimum spanning tree)에서 직진 교통신호등간의 연동들을 통해 출발지와 목적지간의 지연시간을 최소화 하는 것으로 교통격자 가로망을 최적화한다. 또한 컴퓨터 네트워크에서 사용되어지는 Dijkstra algorithm을 통해 구해진 경로에 따라 차량 운전자들이 그 경로를 준수한다고 가정한다면 격자망에서 교통신호등의 연동을 통해 최적화할 수 있음을 보여준다. 격자 가로망에서의 모의실험결과는 직진 교통신호등의 연동을 통해 망을 가로지는 지연시간을 최소화함을 보여준다. In this paper, we deals with optimizing traffic signal timing in grid networks by using a network topology design method. Optimizing traffic signal timing includes minimizing delay time delay between departure and destination by interlocking straight traffic signal in the minimum spanning tree(MST). On the assumption that users of network abide by the paths provided in this paper, this paper shows optimizing traffic signal timing in grid networks. the paths provided in this paper is gathered by using Dijkstra algorithm used in computer networks. The results indicate minimizing delay time of passing through the grid network and interlocking traffic signal in the grid network.

高精度 MANOMETER를 附着한 BET 吸着裝置의 試作

安永弼 慶北大學校 1962 論文集 Vol.6 No.-

I made a trial BET apparatus fitted with the high precision manometer. Employing mercury and oil this maometer could make the measuring of the pressure about ten times preciser than the mercury manometer. Carbon dioxide and nitrogen were used as the adsorption gas, By this apparatus even the specific surface area which is as small as 01.~0.5㎡, could be measured to the third order of the significant figure.

CaO.MgO.$2 SiO_2-Al_2O_3$계의 고용체의 결정구조

안영필,김복희,N. Ishizowa 한국세라믹학회 1986 한국세라믹학회지 Vol.23 No.5

This study was to refined the crystal structure of solid solution to determine the position and amount of Al in diopside and to relate crystal structure changes and properties of solid solution. Single crystals of the solid solution in the system CaO.MgO.$2 SiO_2-Al_2O_3$ were made from the melt with slow cooling and used to refine the structure. The following were obtained. 1. Tetrahedra rotated around axis parallel to the direction which the angle 03-03-03 became small. 2. Tetrahedron became large and regular. Average T-O bond distance increased 0.53 percent. 3. M1 octahedron became small and average M1-O bond distance decreased 1.1 percent. 4, M2 polyhedron became small and average M2-O bond distance decreased 0.37 percent Polythedron was affected not so much compared with any cation site. 5. Distance between metal ions distances between T and oxygens which were coordinated with M2 and meighboring tetrahedron distances between M2 and oxygens which coordinated with M1 and M2 were not changed almost. 6. $Al^{3+}$ substituted 4Mg^{2+}$ and $Si^{4+}$</TEX. with same amount.

Diopside-Anorthite계의 유전체 및 절연체에 관한 연구

안영필,정복환,김일기,이광,Ahn, Young-Pil,Chung, Bok-Hwan,Kim, il-Ki,Lee, Kwang 한국세라믹학회 1979 한국세라믹학회지 Vol.16 No.2

Diopside-Anorthite body was easily synthesized at relatively low temperature 1225℃, compared with the synthesizing temperature 1425℃ of Anorthite. Of Diopside-Anorthite body, the synthesizing temperature was considered to be higher than 1225℃ because Gehlenite, probably formed at 1220℃, was detected by X-ray diffraction. This body has excellent physical and electrical properties, i.e. electric resistivity (1.2×1014Ωcm), low dielectric constant (6.26) and low thermal expansion coeffcient (61.9×10-7/℃). It's hardness was good enough for electrical subsidiary. In addition, this body, Diopside-Anorthite, has exellent properties for heat resisting wares.

$KNO_3$의 첨가가 ZNR (Zinc Oxide Nonlinear Resistor)에 미치는 영향에 관한 연구

안영필,김복희 한국세라믹학회 1980 한국세라믹학회지 Vol.17 No.3

Nonohmic properties of ZnO ceramics with various small amounts of additives were studied in relation to sintering temperature and additive content. The kinds of additives used were basic additives ($Bi_2O_3$, $BaCO_3$, $MnCO_3$, $Cr_2O_3$) and $KNO_3$ Especially this study has focused on the effects of $KNO_3$ in ZnO ceramics with basic additives. SEM studies indicated that microstructures of ZnO, $KNO_3$ and basic additives showed homogenuous grain size in comparison to ZnO and basic additives compounds. The nonohmic exponent ($\alpha$) in ZnO, $KNO_3$ and basic additives component were measured as high as 40.