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$ZrO_2$가 첨가된 Ba(${Zn_{1/3}}{Ta_{2/3}}$)$O_3$의 미세구조 및 유전특성 연구
조범준,양정인,남산,최창학,이확주,박현민,류선윤,Cho, Bum-Joon,Yang, Jung-In,Nahm, Sahn,Choi, Chang-Hack,Lee, Hwack-Joo,Park, Hyun-Min,Ryou, Sun-Youn 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.2
본 연구에서는 Zr $O_2$첨가가 Ba(Zn$_{1}$3/Ta$_{2}$3/) $O_3$(BZT)세라믹의 구조와 고주파 유전특성에 미치는 영향을 조사하였다. 모든 시료에서 $Ba_{5}$Ta$_4$ $O_{15}$ 이차상이 발견되었으며 Zr $O_2$의 첨가량이 증가하면 $Ba_{5}$Ta$_4$ $O_{15}$ 상의 양은 감소하였다. 반면에 Zr $O_2$의 첨가량이 1.5 mol% 이상인 시료에서는 $Ba_{0.5}$Ta $O_3$상이 발견되었다. BZT의 입자 크기는 약 1$mu extrm{m}$ 정도였지만, Zr $O_2$를 첨가하면 입자 크기가 증가하였다. SEM 및 TEM 분석에 의하여 Zr $O_2$가 첨가되면 액상이 존재하는 것을 알 수 있었으며, 이로 인하여 입자가 성장되는 것이 발견되었다. 시편의 밀도는 소량의 Zr $O_2$를 첨가하면 증가하지만 Zr $O_2$첨가량이 증가하면 감소하였다. 유전율은 모든 시료가 27에서 30 사이의 값을 가지고 있었다. 공진주파수 온도계수는 소량의 Zr $O_2$을 첨가하였을 때는 변화하지 않았지만 첨가량이 2.5 mol% 이상에서는 증가하였다. Q$\times$f 값은 Zr $O_2$을 첨가하면 증가하였고, 입자 성장이 완료되는 조성에서 최대 값을 보였다. 본 연구에서는 Zr $O_2$를 2.0 mol% 첨가하고 15$50^{\circ}C$에서 10시간 소결한 시료에서 최대의 Q$\times$f 값(164,000)을 얻을 수 있었다.다.다.
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Sampled-Data System의 信號흐름線圖에 관한 解析的 考察
趙範峻 朝鮮大學校 動力資源硏究所 1982 動力資源硏究所誌 Vol.4 No.1
In this paper, the signal flow graph technique is expanded so that one can apply it directly to the sampled-data system. A new symbol is introduced to define topological structure and shape. The signal flow graph technique is used for theoretical analysis because of its topological nature which makes it possible to get the input-output relation. Mason's theorem is the easiest and simplest expression of input-output relation, Analytical research using a mathematical model is carried out for unsampled and sampled-data response, very important factors for control system design using a signal flow graph which is equivalently transformed from a block diagram a control system as a result, by inseitiun of the black node which is a new symbol representing a sampler, it is proved to be much easier and simpler than the conventional mathematical method to get the unsampled and sampled-data response.
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XR Hands를 통한 가상 객체들과의 상호 작용에 관한 연구
조범준,김성기 (사)한국컴퓨터그래픽스학회 2024 컴퓨터그래픽스학회논문지 Vol.30 No.3
핸드트래킹이 주된 조작이 되는 기기가 출시됨에 따라 현재 확장현실 분야의 관심사 중 하나는 핸드트래킹이다. 핸드트래킹은 사용자에게 몰입감 및 현실감 측면에서 장점이 있으며 그에 따라 교육, 엔터테인먼트, 의료 등 다양한분야에서 활용되고 있다. 활쏘는 동작은 양손을 동시에 써야하는 동시에 표적을 맞추기 위해서는 정교함을 요하는 과거문화적 스포츠적 의의를 가지는 동작이다. 본 연구는 이러한 활쏘는 동작을 구현하는 것을 목표로 했다. 따라서 본 논문은유니티가 제공하는 XR Hands 패키지를 활용하여 손동작을 인식하도록 했으며 기반이 되는 OpenXR 에 대한 탐구했다. 최종적으로는 활 쏘는 동작을 구현했고 메타 퀘스트 2 에서 테스트했다. Hand tracking is currently one of the most promising technologies in XR with the release of extended reality (XR) devices, in which hand tracking is used as the main manipulation. Hand tracking offers advantages in terms of immersion and realism, and as a result, it is being employed in a range of fields, including education, business, and medical care. The archery movement requires using both hands at the same time, but requires sophistication to hit the target and is a movement that has cultural and sports significance in the past. This study aimed to implement this archery movement. Therefore, this paper used the XR Hands package provided by Unity to recognize hand movements, explored the underlying OpenXR, and finally implemented the archery movement and tested it in Meta Quest 2.
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LTCC 슬러리 및 그린시트의 물성 변화에 미치는 혼합용매 조성의 영향
조범준,박은태,Cho, Beom-Joon,Park, Eun-Tae 한국재료학회 2006 한국재료학회지 Vol.16 No.9
The effects of binary solvent mixtures with various ratios of toluene and ethanol on the properties of slurries and green sheets were investigated. Viscosity of slurry was changed by varying the ratio of solvent mixture which affected the solubility of binder. The relative solvency behavior of a solvent mixture could be predicted with the Hildebrand solubility parameter(${\delta}$) and hydrogen bonding index( ${\gamma}$). The minimum viscosity, the best dispersion of binder, was reached at the composition of toluene:ethanol=4:6, which corresponded to our forecast. The mechanical properties of green sheets related to evaporation of solvents were influenced by the composition of the solvent mixture. At the azeotrope the skin was formed on a drying cast during the drying process because of fast evaporation. At a range of concentrations over 50wt% toluene, green sheets could not be fully dried at low temperature due to excessive toluene. The mechanical properties of green sheets were excellent at the azeotrope-like composition of toluene:ethanol=4:6 which has a little excess of toluene over the azeotrope.
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A Study on Hand Gesture Classification for Mobile Game
조범준,김성기,김석규 (사)한국컴퓨터게임학회 2022 한국컴퓨터게임학회논문지 Vol.35 No.3
Before standalone mobile VR (Virtual Reality) were actively developed, there was a movement to make smartphones into HMD (Head-Mounted Display). Google's cardboard and Samsung's GearVR are examples. However, smartphone-based VR has shifted to AR (Augmented Reality) due to the release of standalone VR and the limitations of mobile devices. As examples of using the AR, we can wear accessories even without trying them on, and we can be also guided by arrows on the map when finding a place that we have never visited before. Over the past decade, mobile devices' performance has improved with the development of mobile VR and AR. As a result, the combination of hand gesture classification beyond hand tracking can be utilized for interaction with VR and AR content. In this paper, we describe how to use the hand gesture for the user interaction for the mobile VR and AR. When realizing the gesture classification, we used Manomotion to implement the gesture estimation and 2D/ 3D skeleton was tracked in real time. In this paper, we suggest the methods to classify the hand gesture and verify them through successfully recognizing the gesture and using them at a practical game. We also measure the performance, and the suggested algorithm requires only 0.425 msec to recognize the gesture. This interface can be also used to improve the convenience of users other than games for mobile VR and AR.
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趙範峻,李俊 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.1
Meditch introduced a set of constant matrices for deriving the lower order subsystems. These matrices play a crucial role in obtaining the suboptimal controller. However, no systematic procedure hos been given for choosing thesec constant matrices. In this paper, a method is presented to derive systematically the constant weighting matrices from the modal matrix of the original system. These constant matrices can be termed as aggregation matrices.
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