• IEIE Transactions on Smart Processing and Computing
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• v.3 no.3
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• pp.128-134
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• 2014

A real-time, continuous-scale image interpolation method is proposed based on a bilinear interpolation with directionally adaptive low-pass filtering. The proposed algorithm was optimized for hardware implementation. The ordinary bi-linear interpolation method has blocking artifacts. The proposed algorithm solves this problem using directionally adaptive low-pass filtering. The algorithm can also solve the severe blurring problem by selectively choosing low-pass filter coefficients. Therefore, the proposed interpolation algorithm can realize a high-quality image scaler for a range of imaging systems, such as digital cameras, CCTV and digital flat panel displays.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.196-197
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• 2015

본 논문에서는 산업용 컴퓨터에서 사용할 마우스와 터치스크린을 이용한 산업용 컴퓨터 인터페이스 장치 구현에 대하여 연구하였다. 산업용 제어 현장에서 사용되는 제어용 컴퓨터의 입출력 장치는 확장성을 고려하여 설계되지 않았기 때문에 현재의 컴퓨터 주변장치를 직접 사용할 수 없는 경우가 대부분이다. 본 논문에서는 산업용컴퓨터에서 사용되는 라이트펜과 모니터를 현재 주로 사용하는 마우스와 LCD모니터로 입출력이 가능하도록 하는 인터페이스 장치를 개발하여, 생산 공정에서 사용하는 산업용 컴퓨터의 활용도를 높이고자 한다. 산업용 컴퓨터 인터페이스장치는 ARM 기반 MPU를 이용하여 영상 신호와 외부 입력장치의 자료를 처리하고, CPLD에서 생성된 신호를 제어용 컴퓨터로 입력하였다. 제어컴퓨터의 영상신호를 다양한 모니터와 인터페이스 할 수 있도록 비디오 스케일러(Video Scaler)를 사용하였다. 구현한 인터페이스 장치는 다양한 장치들을 산업용컴퓨터에서 사용이 가능함을 보였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.5
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• pp.575-582
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• 2014

One of the most important decision making is which product's components should make in-house and which should they outsource. This paper suggests a framework to solve above question. This paper applies to LCD TV industry with AHP analysis. The results shows that Scaler chip, LCD panel, MPEG decoder, and Video decoder are important components. Samsung Electronics turn out make in-house these core component. This research will be a good guideline for selecting core component.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.12-15
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• 2013

최근 UHD TV 출시와 HD급 영상의 보편화로 영상에 대한 해상도 변경 기술의 중요성이 높아지고 있다. 본 논문에서는 기존의 cubic convolution 기법을 응용하여, 영역별 특성에 따라 적응적인 가변 커널 길이의 cubic convolution으로 화면 해상도를 변환하는 기법을 제안한다. 제안하는 기법은 영상의 화질을 개선시키면서도 상황에 따라 하드웨어의 line memory를 절약할 수 있도록 설계를 하여 화질 개선뿐만이 아니라 하드웨어적으로도 더 효율적으로 사용이 가능하다. 또 tuning parameter 를 최적화 하는 방법을 통해 기존의 cubic convolution 기법보다 더 좋은 화질의 영상을 얻을 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.2
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• pp.790-809
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• 2019

The design of an efficient scaler to enhance the edge data is one of the most important issues in video signal applications, because the perceptual quality of the processed image is sensitively affected by the degradation of edge data. Various conventional scaling schemes have been proposed to enhance the edge data. In this paper, we propose an efficient scaling algorithm for this purpose. The proposed method is based on the discrete cosine transform-based interpolation filter (DCT-IF) because it outperforms other scaling algorithms in various configurations. The proposed DCT-IF incorporates weighting parameters that are optimized for training data. Simulation results show that the quality of the resized image produced by the proposed DCT-IF is much higher than that of those produced by the conventional schemes, although the proposed DCT-IF is more complex than other conventional scaling algorithms.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.08a
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• pp.265-268
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• 2000

In this paper, we propose an algorithm, an optimized architecture, and an implementation for an improved performance of image downscaler. The proposed downscaler uses two-dimensional digital filters for horizontal and vertical scalings, respectively. It also improves scaling precisions and decreases the loss of data, compared with the 1/32 scaler 〔1〕. In order to achieve the optimization, the digital filters are implemented by the multiplexer -adder type scheme 〔2〕. The scaler is designed by using the Verilog-HDL. It is synthesized into gates by using the Samsung 0.35 um STD90 TLM library.

• Journal of Dental Anesthesia and Pain Medicine
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• v.18 no.3
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• pp.195-196
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• 2018

• Journal of Periodontal and Implant Science
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• v.46 no.2
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• pp.107-115
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• 2016

Purpose: The aim of this study was to evaluate and compare tooth surface characteristics in extracted human molars after cervical enamel projections (CEPs) were removed with the use of three rotating instruments. Methods: We classified 60 extracted molars due to periodontal lesion with CEPs into grade I, II, or III, according to the Masters and Hoskins' criteria. Each group contained 20 specimens. Three rotating instruments were used to remove the CEPs: a piezoelectric ultrasonic scaler, a periodontal bur, and a diamond bur. Tooth surface characteristics before and after removal of the projections were then evaluated with scanning electron microscopy (SEM). We analyzed the characteristics of the tooth surfaces with respect to roughness and whether the enamel projections had been completely removed. Results: In SEM images, surfaces treated with the diamond bur were smoothest, but this instrument caused considerable harm to tooth structures near the CEPs. The piezoelectric ultrasonic scaler group produced the roughest surface but caused less harm to the tooth structure near the furcation. In general, the surfaces treated with the periodontal bur were smoother than those treated with the ultrasonic scaler, and the periodontal bur did not invade adjacent tooth structures. Conclusions: For removal of grade II CEPs, the most effective instrument was the diamond bur. However, in removing grade III projections, the diamond bur can destroy both adjacent tooth structures and the periodontal apparatus. In such cases, careful use of the periodontal bur may be an appropriate substitute.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.1
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• pp.13-19
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• 2017

The use of ultrasonic surgery units and scalers are steadily increasing in the field of dentistry. Such units and scalers should be evaluated before they are commercialized because the mechanical performance and stability of equipment is crucial for patients. Hence, we created a hand-piece moving system that can test bone cutting and teeth scaling. The purpose of this study was to evaluate the teeth scaling performance of ultrasonic scaler unit. Additionally, we measured the temperature distribution and noise during the test. through an experimental test, we found that a high output of an Ultrasonic NX device can cause serious damage to the teeth surface, and it was not within range in heat generation distribution and noise test.

• Journal of Periodontal and Implant Science
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• v.43 no.6
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• pp.301-307
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• 2013

Purpose: This in vitro study was performed to assess the adherence of Porphyromonas gingivalis to a resorbable blast media (RBM) titanium surface pretreated with an ultrasonic scaler or toothbrush and to evaluate the effects of the treatment of the RBM titanium discs on the bacterial removal efficiency of brushing by crystal violet assay and scanning electron microscopy. Methods: RBM titanium discs were pretreated with one of several ultrasonic scaler tips or cleaned with a toothbrush. Then the titanium discs were incubated with P. gingivalis and the quantity of adherent bacteria was compared. The disc surfaces incubated with bacteria were brushed with a toothbrush with dentifrice. Bacteria remaining on the disc surfaces were quantified. Results: A change in morphology of the surface of the RBM titanium discs after different treatments was noted. There were no significant differences in the adherence of bacteria on the pretreated discs according to the treatment modality. Pretreatment with various instruments did not produce significant differences in the bacterial removal efficiency of brushing with dentifrice. Conclusions: Within the limits of this study, various types of mechanical instrumentation were shown to cause mechanical changes on the RBM titanium surface but did not show a significant influence on the adherence of bacteria and removal efficiency of brushing.