• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권2호
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• pp.542-558
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• 2023

A digital focus index (DFI) is a value used to determine image focus in scientific apparatus and smart devices. Automatic focus (AF) is an iterative and time-consuming procedure; however, its processing time can be reduced using a general processing unit (GPU) and a multi-core processor (MCP). In this study, parallel architectures of a minimax search algorithm (MSA) are applied to two DFIs: range algorithm (RA) and image contrast (CT). The DFIs are based on a histogram; however, the parallel computation of the histogram is conventionally inefficient because of the bank conflict in shared memory. The parallel architectures of RA and CT are constructed using parallel reduction for MSA, which is performed through parallel relative rating of the image pixel pairs and halved the rating in every step. The array size is then decreased to one, and the minimax is determined at the final reduction. Kernels for the architectures are constructed using open source software to make it relatively platform independent. The kernels are tested in a hexa-core PC and an embedded device using Lenna images of various sizes based on the resolutions of industrial cameras. The performance of the kernels for the DFIs was investigated in terms of processing speed and computational acceleration; the maximum acceleration was 32.6× in the best case and the MCP exhibited a higher performance.

• 한국통신학회논문지
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• 제29권12C호
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• pp.1692-1706
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• 2004

최근 정보통신기술의 급속한 발달로 무선인터넷을 이용한 전자상거래 사용자가 폭발적으로 증가하고 유선에서 유/무선 통합 환경으로 변화함에 따라 보안상의 많은 문제점이 제시되고 있다. 특히 무선전자상거래에서는 무선 환경의 제한적 특정에 따라 경랑화된 보안기술, 종단간 보안 기술 및 프라이버시 보안 등에 관한 연구가 활발하게 진행되고 있다. 현재 무선 전자상거래에서는 주로 신용카드기반의 지불 프로토콜인 WPP와 ASPeCT에서 제안한 인증과 지불초기화를 위한 AIP프로토콜을 사용하고 있다. WPP에서 사용하는 보안 프로토콜 WAP는 무선과 유선을 연계하는 G/W에서 전달되는 데이터의 모든 내용이 누출되는 보안상의 취약점이 있어 종단간 보안도 제공하지 못하는 단점이 있고, AlP 프로토콜은 인증서 체인을 이용하여 인증을 수행하므로 계산량이 많은 단점과 인증서에서 사용자의 신원이 노출되어 프라이버시 보호를 위한 익명성이 보장되지 않는 단점이 있다. 이 논문에서는 기존 AIP프로토콜을 기반으로 초특이 타원곡선인 Weil Pairing을 적용한 ID 기반 공개키 암호기법을 사용하여 거래정보의 기밀성을 보장하고 은닉전자서명 기법을 통한 인증서를 사용하여 프라이버시 보호, 공개키와 사용자 인증 및 부인방지를 해결했으며 또한 두 객체만 공유하는 세션키를 사용하여 종단간 보안이 제공되는 특정 무선 플fot폼에 독립적이며 안전하고 효율적인 지불 프로토콜을 제안하였다. 또한 제안한 프로토콜은 사용자와 서비스 제공자간의 온라인 인증기관이 지불 프로토콜의 인증과정에 참여함으로써 다른 도메인에 존재하는 서비스 제공자에게도 효율적이고 안전한 서비스를 받을 수 있도록 하였다.

• Journal of Information Technology Applications and Management
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• 제18권2호
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• pp.1-21
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• 2011

In this era of convergence, which is characterized by the integration and combination of technology and industries, broadcasting and communications, offline and online, and devices and services, the content industry is also experiencing rapid changes including inter-genre exchange, the creation of new industries, and customized demand. Specifically, IT-based digital content industries such as the online game, e-book, mobile contents and web portal industries are no longer restricted to the boundaries of video, music and games but are being expanded into the realms of education, medicine, fashion and sports thanks to CT innovation of 3D, CG, AR/VR, VFX, etc. As such, various countries have come to recognize the convergent content industry as a new growth engine that will pick up where the IT industry left off, and are forming policies for its development accordingly. This research aims to optimize the system of content taxonomy which is currently genre-focused and unable to support technological development and convergence, and to discover and select star contents to be rigorously developed with governmental support. In this paper, 20 star contents in 8 areas were selected, and these are expected to create tremendous cultural and economic value through ongoing technological and industrial development.

• 만화애니메이션 연구
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• 통권9호
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• pp.33-58
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• 2005

이 논문은 한미일 만화영상의 학문 ${\cdot}$ 예술 ${\cdot}$ 문화 ${\cdot}$ 산업 활동을 비교하여 한국의 만화영상 발전에 이바지하고자 연구한 것이다. 미국과 일본의 만화영상은 전반적인 활동 면에서 세계의 정상 수준으로 선진화되어있다. 따라서 한미일 3개국의 만화영상을 분석하여 한국 만화영상의 학문화 ${\cdot}$ 예술화 ${\cdot}$ 문화화 ${\cdot}$ 산업화 방안을 모색 한다.

• 대한인간공학회지
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• 제30권6호
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• pp.739-747
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• 2011

Objective: The present study evaluated information presentation methods applicable to a wearable Braille display in terms of performance and satisfaction measures. Background: A Braille display wearable at a finger can improve accessibility of information for the blind by presenting information in real time. Method: A Braille display with six pins operated by DC servomotors was developed to simulate four information presentation methods(active, stationary, simultaneous, and sequential methods). An evaluation experiment was conducted with 16 participants(8 normal and 8 blind participants) by using three objective measures(reaction time, RT, unit: sec; recognition time, CT, unit: sec; correct response percentage, CP) and two subjective measures(overall satisfaction, OS; perception easiness, PE) with a 7-point scale. Results: The average RTs and CTs of the active and stationary methods were significantly shorter than those of the simultaneous and sequential methods for the blind participants. Also, the average CPs, OSs, and PEs of the active and sequential methods were significantly higher than those of the stationary and simultaneous methods. Conclusion: The active and sequential methods were preferred to the other methods for the blind. Application: The performance characteristics identified in the present study for the four braille display methods can be utilized to develop an effective wearable Braille display system.

• 한국임상수의학회지
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• 제37권1호
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• pp.15-22
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• 2020

This study investigated the effectiveness of radiation safety rules in animal hospital and the awareness and behavior of veterinary radiation workers. With the questionnaires, the data was collected from randomly selected veterinarians in animal hospitals and animal medical imaging centers. Collected data were about radiation device, shielding device, regulations, safety management, education, knowledge, behavior and awareness. Frequency, correlation and multiple regression analysis were performed. The medical devices related with radiation in animal hospital were X-ray (59%), CT (15%), fluoroscopy (12%), mobile X-ray (12%) and others (2%). The number of people using radiation shielding device is high. The answers were low on knowing radiation related regulation and receiving radiation protection education. The group with higher knowledge and awareness shows positive correlation with safety behavior. The increase of use of the radiation related medical devices in veterinary hospital causes the increase of radiation exposure risk. This study suggests that radiation safety management system and policies need to be developed to protect radiation workers and give them correct information and consciousness.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.86-89
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• 2002

The purpose is to develop a system to reduce the organ movement from the respiration during the 3DCRT or IMRT. This research reports the experience of utilizing personally developed system for mobile tumors. The patients clinical database was structured for 10 mobile tumors and patient setup error measurement and immobilization device effects were investigated. The RMRD system is composed of the respiratory motion reduction device utilized in prone position and abdominal strip device(ASD) utilized in the supine position, and the analysis program, which enables the analysis on patients setup reproducibility. Dose to normal tissue between patients with RMRDs and without RMRDs was analyzed by comparing the normal tissue volume, field margins and dose volume histogram(DVH) using fluoroscopy and CT images. And, reproducibility of patients setup verify by utilization of digital images. When patients breathed freely, average movement of diaphragm was 1.2 cm in prone position in contrast to 1.6 cm in supine position. In prone position, difference in diaphragm movement with and without RMRDs was 0.5 cm and 1.2 cm, respectively, showing that PTV margins could be reduced to as much as 0.7 cm. With RMRDs, volume of the irradiated normal tissue (lung, liver) reduced up to 20 % in DVH analysis. Also by obtaining the digital image, reproducibility of patients setup verify by visualization using the real-time image acquisition, leading to practical utilization of our software. Internal organ motion due to breathing can be reduced using RMRDs, which is simple and easy to use in clinical setting. It can reduce the organ motion-related PTV margin, thereby decrease volume of the irradiated normal tissue.

• Archives of Plastic Surgery
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• 제37권4호
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• pp.481-484
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• 2010

Purpose: Congenital dermoid cysts develop during the fusion of the embryo when the ectodermal tissue gets trapped in the line of fusion. Dermoid cysts of the head are rare lesions comprised of epidermal and mesodermal elements. Furthermore, dermoid cysts in the occipital area are extremely rare. Only a few cases of dermoid cysts in the posterior scalp have been reported. Especially, A bilateral, synchronous presentation in this location has not been reported previously in the literature. Methods: All 5 cases had a gradually enlarging mass of the posterior aspect of the scalp. The cysts were mobile, noncompressible, and non-tender, without evidence of an associated sinus tract, skin dimpling, discoloration, or communication with adjacent structures. The CT scan displayed a hypodense cystic lesions about -87 to +24 HU (Housefield units, average +3.2 HU) with hypodense capsule and no postcontrast enhancement. All tumors were found just under the skin, and were well encapsulated, so they were completely removed the mass with adjacent periosteum. Results: On gross findings, all tumors were oval-or round-shaped, and when the cystic tumor was cut open it presented a greasy and caseous substance. Histologically, all specimens contain desquamated squamous epithelium and keratin in the lumen and are encapsulated and lined by keratinized stratified squamous epithelium. And, all cases of posterior mass are the presence of adnexal structures. Conclusion: Appropriate diagnosis requires not only an index of suspicion for this rare tumor a very careful history and search for skin changes. Especially, CT can reveal the exact location of the cyst, its relationship with the adjacent structures. We think that occipital dermoids divide into superficial and deep type. In our cases, because they did not have intra-cranial involvement or fistula formation, they are superficial type. This report describes the clinical and operative aspects of the superficial dermoid cysts and provides a review of the literatures.

• Journal of Computational Design and Engineering
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• 제3권4호
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• pp.363-369
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• 2016

Cyber Physical System (CPS) and Internet of Things (IoT) are hot objects of interest as an extension of the embedded system. These interactive products and systems contain Mobile Devices which are most popular and used most frequently. Also these have been widely used from the control of the Nuclear Power Control System (NPCS) to IoT Home Service. Information & Communication Technology (ICT) topics of trend fused-complex current Information Technology (IT) and Communication Technology (CT) are closely linked to real space and virtual space. This immediately means the arrival of the ultra-connected society. It refers to a society in which various objects surrounding the human innovation and change in the social sector are expected through the connection between the data which are to be generated. In addition, studies of Tool-kit for the design of such systems are also actively pursued. However, only increased cooperation and information sharing between the physical object consists of a variety of machinery and equipment. We have taken into consideration a number of design variables of the high barriers to entry about the product. In this study, It has been developed a Web-based collaboration framework which can be a flexible connection between macroscopically virtual environment and the physical environment. This framework is able to verifiy and manage physical environments. Also it can resolve the bottlenecks encountered during the base expansion and development process of IoT (Internet of Things) environment.

• 한국콘텐츠학회논문지
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• 제11권11호
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• pp.91-101
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• 2011

이 연구는 헤어라인 교정을 위한 웹 베이스의 3D 얼굴 모델링 구축을 목적으로 하고 있다. 미(美)에 대한 현대사회의 얼굴에 대한 관심은 광범위한 개인의 모바일 스마트 ICT 기기의 시대와 함께 의료 정보 시스템의 필요성 역시 급격하게 증가하고 있다. 이 연구는 기존의 기술의 독점과 배포 가능한 3D 모델링 라이브러리 구축을 시도하려 한다. 우리는 실험 결과를 통하여 새로운 웹 베이스 표준 개발을 위한 문제점 및 요구사항을 찾을 수 있었다. 우리는 우리의 실험과 관련 기술에 관한 문헌 검토에 따른 새로운 시스템을 제안하고자 한다. 우리가 제안하고자 하는 시스템의 주된 특징은 의과학, 미용학과 정보 기술을 기반으로 한 탈모 치료에 대한 연구이다. 이 시스템은 2D 정면 이미지를 3D mesh-data와 함께 얼굴 모델링을 진행한다. 이 mesh-data는 SVG를 포합한 웹 표준 기술과 HTML5에 의해 기본적으로 지원되는 Canvas Tag와 호환이 된다.