• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.13 no.5
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• pp.412-418
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• 2020

This paper produced an automatic fluid management system that can accurately control the specific gravity of etching solution(FeCl₃), and produced a SUS MASK applied to OLED. The target was set at 0.4 mm in diameter of the hole. As a result of this misconception, the etching speed increased when the specific gravity(S.G) value of FeCl₃ was changed from 1.43 to 1.49. And when the weight was 1.49, it was found that the vertical diameter was 0.405 mm, approaching the target. When pressure injection was varied from 2.0kg/cm2 to 3.5kg/cm2, the hole diameter at 3.0 kg/cm2 averaged 0.4mm, matching the target. The characteristics of the change in gravity were analyzed by applying the additive 1.2% and setting the weight at 1.430 by mixing HCl and H2O in FeCl₃ and fixing the injection pressure at 3.0 kg/cm2. When the weight changed from 1.460 to 1.469 the etching speed increased from 0.564 to 0.540. When the weight was 1.467, the hole diameter was measured at 0.4 mm and the target was reached.

• Journal of the Korean Chemical Society
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• v.31 no.5
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• pp.375-381
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• 1987

Rates for the aquation of trans-[Cr(tn)$_2Cl_2]^+$ and trans-[Cr(en)(tn)Cl$_2$]^+$ ions in aqueous acidic solution have been measured by spectrophotometric method at various temperatures and pressures. Activation volumes are negative and lie in the limited range -1.7 ∼ -2.9cm$^3$mol$^{-1}$ or the complex ions. Activation entropies and activation compressibility coefficients are small negative values. From the results of thermodynamic parameters, it can be inferred that the aquation of the complex ions proceed through an associative interchange(Ia) mechanism. Furthermore, the information on possible transition state structure and reaction paths can be obtained by considering total stabilization energy of the hypothetical intermediates within the framework of angular overlap model. It is found that the theoretically predicted mechanism is consistent with the experimentally observed results.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.60-62
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• 2022

SYCL은 OpenCL 디바이스를 위해 추상화한 C++ 프로그래밍 모델이다. OpenCL에 비해 SYCL은 높은 생산성 등 C++이 가지고 있는 강점을 보유하며, 인텔이 이기종 컴퓨팅을 위한 개발 언어로 SYCL 기반의 DPC++을 출시함에 따라 많은 주목을 받고 있다. 우리는 여러 SYCL 구현물들 중에서 NVIDIA, AMD 등 다양한 GPU를 지원하고, 코드의 수정 및 추가가 용이한 hipSYCL를 채택하여 여러 연구를 진행하고 있다. 본 논문에서는 hipSYCL 구조 내에 AMD GPU를 위한 HIP 백엔드 플러그인을 대체할 수 있는 새로운 백엔드 플러그인을 제안한다. 이 플러그인은 HSA 런타임 API를 사용하여 기존의 플러그인보다 계층 구조를 줄이고 경량화하였다.

• Journal of Satellite, Information and Communications
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• v.10 no.1
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• pp.1-5
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• 2015

With the help of fast growing multimedia technology and high preference for users of large screens, the newest video coding standard, HEVC (High Efficiency Video Coding) high-quality video compression), has been introduced. Therefore, the high definition image services which are four times more clear than conventional HD video, are getting popular. JPEG 2000 also has stated to support 4K and 8K UHD. As a result, it requires fast processing technology to read and write UHD images. This paper introduces a study on fast parallel processing technology for UHD images. For this purpose, first, JPEG 2000 is reviewed and a GPU based parallel implementation is proposed for a preprocessing of color conversion stage. The parallelled algorithm is implemented with OpenCL (Open Computing Language). The simulation results show that the proposed method shows 5 times performance improvements on processing speed for 4K UHD over the method using threads.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.3
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• pp.531-546
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• 2015

A non-interactive key exchange protocol provides an efficiency of overall system by eliminating additional communication. However, traditional non-interactive key exchange protocols without updating a private key fail to provide forward secrecy, since there is no usage of ephemeral key for randomness of session key. In 2012, Sang et al. proposed a certificateless non-interactive key exchange(CL-NIKE) protocol, but they do not prove the security of the protocol and it does not provide forward secrecy. In this paper, we propose a new CL-NIKE protocol and it's security model. Then we prove the proposed protocol is secure under the security model based on DBDH(Decision Bilinear Diffie-Hellman) assumption. Moreover, we propose a CL-NIKE protocol with forward secrecy which updates user's private key by using multilinear map and prove it's security.

• The KIPS Transactions:PartB
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• v.18B no.4
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• pp.221-230
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• 2011

Digital comic images are one of popular contents on the Internet. Usually, they are scanned from comic books by digital scanners. Without post-processing, they may have different sizes, skews and margins other than contents at the boundary. To normalize the size of their contents without the skews and margins is an important step in comic image analysis and application such as content-based comic image retrieval system. In this paper, we propose a method to detect a box frame in comic images by extracting of line segments using the gradient Radon transform. The box frame in comic images is the maximum rectangle which consists of contents without margins. We use the detected box frame to normalize the size of comic images and to make them no skew. In addition, the proposed method is implemented by OpenCL to speed up the detection of the line segments. Experimental results show that our proposed method effectively detects the box frame in comic images.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.10
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• pp.1279-1286
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• 2021

The electrocardiogram (ECG) signal is a good indicator for early diagnosis of heart abnormalities. The ECG signal has a different reference normal signal for each person. And it requires lots of data to diagnosis. In this paper, we propose an adaptive OpenCL-based FPGA-GPU hybrid-layer platform to efficiently accelerate ECG signal diagnosis. As a result of diagnosing 19870 number of ECG signals of MIT-BIH arrhythmia database on the platform, the FPGA accelerator takes 1.15s, that the execution time was reduced by 89.94% and the power consumption was reduced by 84.0% compared to the software execution. The GPU accelerator takes 1.87s, that the execution time was reduced by 83.56% and the power consumption was reduced by 62.3% compared to the software execution. Although the proposed FPGA-GPU hybrid platform has a slower diagnostic speed than the FPGA accelerator, it can operate a flexible algorithm according to the situation by using the GPU.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.6
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• pp.2648-2668
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• 2016

Modern mobile devices are equipped with various accelerated processing units to handle computationally intensive applications; therefore, Open Computing Language (OpenCL) has been proposed to fully take advantage of the computational power in heterogeneous systems. This article introduces a parallel software decoder of Low Density Parity Check (LDPC) codes on an embedded heterogeneous platform using an OpenCL framework. The LDPC code is one of the most popular and strongest error correcting codes for mobile communication systems. Each step of LDPC decoding has different parallelization characteristics. In the proposed LDPC decoder, steps suitable for task-level parallelization are executed on the multi-core central processing unit (CPU), and steps suitable for data-level parallelization are processed by the graphics processing unit (GPU). To improve the performance of OpenCL kernels for LDPC decoding operations, explicit thread scheduling, vectorization, and effective data transfer techniques are applied. The proposed LDPC decoder achieves high performance and high power efficiency by using heterogeneous multi-core processors on a unified computing framework.

• Broadcasting and Media Magazine
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• v.26 no.4
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• pp.48-60
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• 2021

복잡한 알고리즘을 요구하는 3차원 공간 정보 취득 기술은 대부분 고성능의 하드웨어를 필요로 한다. 그러나 최근 스마트폰과 같은 모바일 플랫폼의 성능이 급격히 발전하면서 기존 알고리즘을 가속화해 온 디바이스로 이식하는 연구가 증가하고 있다. 이러한 추세에 따라 본 기고문은 플랫폼 제한 없는 GPU 병렬처리 프레임워크 OpenCL을 활용한 3차원 공간 정보 취득 기술의 가속화 방법을 소개하고자 한다. 본 고의 구성은 다음과 같다. 먼저 모바일 GPU 환경에서의 OpenCL 최적화 방법을 살펴본다. 이후 고전적인 기하학 기반의 스테레오 정합 알고리즘을 가속화한 방법을 소개한다. 마지막으로는 심층 신경망 네트워크와 가속화된 고전적 스테레오 알고리즘을 결합한 온 디바이스 친화적인 융합 알고리즘을 소개한다.

• Proceedings of the Korean Society for Information Management Conference
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• 2000.08a
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• pp.45-50
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• 2000

자동분류나 정보검색에 활용되는 문헌 클러스터링 결과의 성능을 평가하는 방법에는 여러가지가 있다. 본 논문에서는 제시된 몇 가지 평가방법의 개념과 특징에 대해 알아본다 학술논문 초록 집합인 KTSET과 신문기사 집합인 KFCM-CL을 대상으로 각각 유사계수를 변화시켜가며 클러스터링한 결과에 대해 각 평가방법을 적응해본 후, 특징과 문제점을 살려 보았다.