• 한국안전학회지
• /
• 제36권2호
• /
• pp.58-67
• /
• 2021

Incident investigation is regarded as a means to improve safety performance. For the prevention of industrial accidents, measures such as providing safety education, enhancing management interest and participation, establishing a safety management system, and conducting inspection of the work site are necessary. In particular, accident investigation activities, which are an important element of safety management, help to prevent similar accidents, thereby minimizing damage and enhancing work safety. They are critical for understanding business-related incidents and the vulnerabilities and opportunities associated with them. Therefore, it is clear that accident investigation activities are important for accident prevention. The primary focus of many incident investigation processes is on identifying the cause of an event. While considerable research has been conducted on potential accident investigation tools there has been little research on including the views and experiences of practitioners in the accident investigation process. In this study, a questionnaire survey was conducted among safety managers in the domestic manufacturing/construction industry to understand the practice of accident investigation. The investigation pertained to companies' accident investigation systems, the competence of investigators, and the identification and recommendations of the cause of accidents. From the analysis results of accident investigations, investigators' competence, the difficulty level of investigations, and the root causes of accidents were identified from the viewpoint of the participants of the accident investigations. In particular, the development of standardized and simple accident investigation methods and their dissemination to companies were found to be necessary for activating the root cause of accidents. Based on this, it can be used as basic data for the development of root cause analysis investigation techniques that are easily applicable to organizations.

• 대한기계학회논문집B
• /
• 제25권7호
• /
• pp.905-914
• /
• 2001

A large eddy simulation(LES) is performed for turbulent flow around a bluff body inside a sudden expansion cylinder chamber, a configuration which resembles a premixed gas turbine combustor. To promote turbulent mixing and to accommodate flame stability, a flame holder is installed inside the combustion chamber. The Smagorinsky model is employed and the calculated Reynolds number is 5,000 based on the bulk velocity and the diameter of the inlet pipe. The simulation code is constructed by using a general coordinate system based on the physical contravariant velocity components. The predicted turbulent statistics are evaluated by comparing them with the laser-doppler velocimetry (LDV) measurement data. The agreement of LES with the experimental data is shown to be satisfactory. Emphasis is placed on the time-dependent evolutions of turbulent vortical structure behind the flame holder. The numerical flow visualizations depict the behavior of large-scale vortices. The turbulent mixing process behind the flame holder is analyzed by visualizing the sectional views of vortical structure.

• 대한의용생체공학회:의공학회지
• /
• 제17권4호
• /
• pp.479-490
• /
• 1996

To utilize collagen as an implantable biomateriall the mcct widely used bovine skin origin Type I collagen was investigated Pepsin treated, Type I atelocollagen was extracted and crosslinked by the ultraviolet(W) ray with wavelength of 254nm or by various concentrations of glutaraldehyde to produce collagen membranes. The crosslink rates of the specimens were observed by a polarized light microscope, a scanning electron microscope, and a Fourier transform infrared (FT-lR) spectrometer. The followings are concluded 1. The collagen membranes produced by both 2.5% glutaraldehyde solution and 254nm UV ray irra- diation demonstrated similar morphologies on polarized light microscopic and scanning electron microscopic views. 2. The chemical structures of the crosslinked membranes by glutaraldehyde over 2.5% in concentrations revealed similar intensities to that of the UV ray irradiated one in FT-lR investigation. 3. To obtain optimal croulink in bovine stalin origin Type I atelocollagen, 2.5% glutaraldehyde solution or UV ray irradiation with 254nm wavelength is acceptable.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제5권11호
• /
• pp.2175-2190
• /
• 2011

This paper presents the effects of depth map quantization for multiview intermediate image generation using depth image-based rendering (DIBR). DIBR synthesizes multiple virtual views of a 3D scene from a 2D image and its associated depth map. However, it needs precise depth information in order to generate reliable and accurate intermediate view images for use in multiview 3D display systems. Previous work has extensively studied the pre-processing of the depth map, but little is known about depth map quantization. In this paper, we conduct an experiment to estimate the depth map quantization that affords acceptable image quality to generate DIBR-based multiview intermediate images. The experiment uses computer-generated 3D scenes, in which the multiview images captured directly from the scene are compared to the multiview intermediate images constructed by DIBR with a number of quantized depth maps. The results showed that there was no significant effect on depth map quantization from 16-bit to 7-bit (and more specifically 96-scale) on DIBR. Hence, a depth map above 7-bit is needed to maintain sufficient image quality for a DIBR-based multiview 3D system.

• 기술혁신학회지
• /
• 제16권3호
• /
• pp.672-693
• /
• 2013

최근 우리나라에서는 창조경제에 대한 관심이 뜨겁다. 그러나 새 정부의 캐치프레이즈인 창조경제가 무엇이고 어떻게 접근해야 하는지 방법론에 대한 의견이 분분하다. 이에 본 연구는 국내 과학기술계에서 바라보고 있는 창조경제 관점이 현안과제를 적절히 반영하지 못한다는 가정 하에, 새로운 대안으로 '국민행복을 위한 창조경제 관점'을 제시하고 박근혜 정부에 주는 함의를 도출하고자 하였다. 이를 위해 먼저 창조경제에 대한 이론을 개관하고, 창조경제를 바라보는 기존 관점을 비판적으로 고찰하였다. 그 다음 국민행복을 위한 창조경제 패러다임의 특성과 사례를 살펴본 후, 마지막으로 박근혜 정부에 주는 함의를 도출하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제14권9호
• /
• pp.3782-3796
• /
• 2020

A three-dimensional (3D) reconstruction is an important research area in computer vision. The ability to detect and match features across multiple views of a scene is a critical initial step. The tracking matrix W obtained from a 3D reconstruction can be applied to structure from motion (SFM) algorithms for 3D modeling. We often fail to generate an acceptable number of features when processing face or medical images because such images typically contain large homogeneous regions with minimal variation in intensity. In this study, we seek to locate sufficient matching points not only in general images but also in face and medical images, where it is difficult to determine the feature points. The algorithm is implemented on an adaptive threshold value, a scale invariant feature transform (SIFT), affine SIFT, speeded up robust features (SURF), and affine SURF. By applying the algorithm to face and general images and studying the geometric errors, we can achieve quasi-dense matching points that satisfy well-functioning geometric constraints. We also demonstrate a 3D reconstruction with a respectable performance by applying a column space fitting algorithm, which is an SFM algorithm.

• Agricultural and Biosystems Engineering
• /
• 제6권2호
• /
• pp.70-76
• /
• 2005

Seed, stem and sprout of F. tataricum were separately milled using the ultra fine mill under the same condition to investigate the effect of roasting or extruding on the particle size, microstructure and water solubility of dietary fiber. The mean particle size of MR (roasting) is increased in stem and sprout, and that of ME (extruding) is increased in seed, compared to that of control. The microscopic views of seed show that control has the spherical shape but ME the larger and irregular shape, and those of stem and sprout show that control has the needle like shape but ME more rounded shape. Water solubility index of ME is much higher than that of control or MR in seed, stem and sprout. It shows that seed, stem and sprout are damaged more in extruding than in roasting, and the starch and cell wall structure must be destroyed to change the water insoluble dietary fiber into the water soluble dietary fiber.

• 대한의용생체공학회:의공학회지
• /
• 제36권5호
• /
• pp.162-168
• /
• 2015

In this study, we suggested the performance and safety testing guideline for low intensity pulsed ultrasound (LIPUS) represented by the ultrasound fracture treatment device and cartilage treatment device and low intensity focused ultrasound (LIFU) represented by ultrasonic face lifting device. For these study, the international standards and management regulations of Korea, Japan and United State were analyzed. And the usefulness and applicability were evaluated by testing with commercial equipment and reflecting the views of the industry and experts. As a result of this study, the safety and performance test guidelines for low intensity therapeutic ultrasound device were proposed by presenting the 10 items for LIPUS and 12 items for LIFU. The suggested guidelines are considered a high utilization in the domestic testing and approval authorities. And they are also thought to be useful to new technology development.

• 시큐리티연구
• /
• 제9호
• /
• pp.237-260
• /
• 2005

전자정보통신 기술의 발달로 인한 정보화의 수준이 계속 발전, 심화되면서 ‘언제 어디서나 존재한다’라는 의미를 가진 유비쿼터스(Ubiquitous) 컴퓨팅 시대는 20세기 후반부터 우리가 경험해왔던 것보다 더욱 큰 IT 패러다임의 변화와 이에 따른 삶의 커다란 변화를 가져다 줄 것으로 예상하고 있다. 기술의 발달은 새로운 위험을 초래한다. 테러리스트 들은 새로운 정보통신기술발전을 이용한 전혀 새로운 형태의 사이버 테러를 시도하고 있고 이러한 테러리스트들의 테러움직임에 대한 국가적인 대비태세 완비는 매우 시급한 것이 현실이다. 본 논문에서는 유비쿼터스 시대의 새로운 형태의 보안 문제로 첫째, 광대역 통합망(Broadband Convergence Network, BcN) 구축에 따른 보안위협 확산, 둘째, 무선 환경에 취약한 정보보안, 셋째, 개인정보의 유출 가능성 증대, 넷째 사이버위협을 통한 현실세계 위협의 증가, 다섯째, 군사작전사의 기밀유출 및 작전 마비 등을 지적하는 한편, 테러 대비 태세와 관련 우리가 현재 직면하고 있는 조직, 인력 및 기술 그리고 예산상의 문제점을 미국이나 일본 등의 외국과 비교하여 살펴보고 이에 대한 대안을 모색하였다.

• 디자인학연구
• /
• 제18권1호
• /
• pp.81-90
• /
• 2005

유니버설 디자인은 베리어 프리(barrier-free), 수용 가능한(adaptive), 평생의 디자인(life-span design)의 세 개념을 포함한다. 그것은 단순히 장애가 있는 사람들을 위한 접근성 차원의 디자인이라기보다는 확장된 개념으로서 인간이 접하는 모든 물리적 환경이나 시설들을 접근하기 쉽고 사용하기 편하도록 디자인하는 것이다. 본 연구에서는 그러한 유니버설디자인의 현재와 미래 방향을 부엌디자인의 사례를 중심으로 조망해보았다. 문헌상의 디자인지침과 사례들에서 살펴본 현재 시장의 추이와 선행연구들의 특징들에서 살펴본 시대적 추이를 토대로 제안한다면, 향후 유니버설 부엌디자인은 '사용자에 따른 대량맞춤', '신기술의 적용', '심리적 측면의 고려' 등의 방향으로 전개되어야 할 것이다. 또한 유니버설디자인이 확산되기 위해서는 '적절한 경제적 비용문제의 해갈, '사회적 인식의 확산', 디자인에 있어 '문제인식의 전환'이 있어야 할 것으로 판단된다. 아직 우리나라에서는 유니버설디자인개념의 디자인모델들이 여러 분야에서 양산되고 있는 실정은 아니다. 앞으로 우리나라 상황에 적합한 유니버설디자인을 개발 연구하기 위해서는 물리적, 지각적, 심리적 측면뿐만 아니라 우리의 문화적, 지역적 특성도 감안되어야 할 것이다.