• 한국지구과학회지
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• 제28권7호
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• pp.825-837
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• 2007

한국 국립해양조사원의 수심자료와 미국 NIMA((National Imagery and Happing Agency)의 수치지형자료를 바탕으로 우리나라 일원에서 측정한 중력의 지형보정을 위한 위도 및 경도 간격이 각각 $3"{\times}3"$)인 지형자료를 재편집하였다. 이 자료를 바탕으로 지구 곡률을 고려한 정밀 지형보정값을 계산하기 위한 알고리즘을 개발하였고, 중력측정점으로부터 반지름 166.735 km인 원 내부에 대한 지형보정값을 계산하는 Fortran프로그램을 작성하였다. 이 알고리즘 및 프로그램을 이용하여 남한 전역에 대한 지형보정값을 계산하였다. 그 결과 최대값은 56.508 mGal 이고 평균값은 4.539 mGU이다.

• 디지털융복합연구
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• 제12권12호
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• pp.521-528
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• 2014

본 논문에서는 HTML5에서 직선의 기울기를 이용하여 2D 이미지를 3D 입체 이미지로 변환하는 방법을 제안한다. 3D 이미지 변환을 위한 어떠한 정보도 없이 단 하나의 원본 이미지를 좌안과 우안을 위해 RGB 색상을 필터링한다. 사용자는 깊이 값을 설정하기 위해 미리 만들어 놓은 제어 점을 선택한 후 깊이 값을 설정하는 작업을 수행한다. 이렇게 선택된 값들을 반영하여, 이미지 전체와 부분적인 원근감을 갖도록 사용자가 정의한 직선의 기울기를 이용하여 좌안과 우안을 위한 깊이를 부여한 후 Anaglyph 3D 이미지를 자동으로 생성하게 된다. 이 모든 과정이 HTML5를 사용한 웹 환경에서 구현하였기 때문에, 사용자들은 매우 쉽고 편리하게 자신들이 원하는 3D 이미지를 생성할 수 있게 된다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.180-184
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• 1998

Recently the performance of CO2 arc welding machine has been advanced significantly through the adoption of inverter circuit topology which made it possible to control the waveform of welding current and thus to suppress the spatter generation. However, the optimum waveform is still uncertain. As a first step for figuring out the promising waveforms, this study was performed to set-up the experimental system for studying the effect of waveform variables. The overal system is controlled digital controller using single chip microprocessor of 80C196KC. As a result of performance test of this system, it was demonstrated all of the waveform variables could be set individually and the generated spatter is reduced compare to conventional inverter arc welding machine.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.83-86
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• 2005

This paper proposed a hydraulic pump system which uses a variable SR drive and constant capacity pump. The base and maximum speed, torque are determined from displacement capacity of the pump and maximum pressure. The drive system is set to have a minimum power consumption having hydraulic preset pressure, which is operated within a maximum capacity and maximum preset pressure. This is achieved by controlling motor speed and power with feedback signal of pressure of the hydraulic pump. A 2.2kw, 12/8-pole SR motor and DSP based digital controller are designed and prototype drive system is manufactured. The proposed variable speed SR drive system is simulated and tested with experimental set-up. The test results show that the system has some good features such as high efficiency and high response characteristics.

• 한국디지털건축인테리어학회논문집
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• 제7권1호
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• pp.7-13
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• 2007

Virtues and advantages of urban areas would be tarnished if benefits and convenience of the cities were overwhelmed by the logics of selfish development and reckless expansion. Reckless development, which is not limited to a certain point of time and space, has become a social and environmental problem for a long period of time, taking advantage of legal and administrative loopholes. In the metropolitan area surrounding the capital, especially Yongin, where semi-agricultural zones have been developed recklessly, serious problems have already emerged including the lack of infrastructure, environmental contamination, destruction of scenic landscapes, encroachment of good farmland and forest and invitation of natural disasters. This study assumed all these problems as the consequence of the inadequacy of the legislative system and analyzed the causes. The study also suggests some countermeasures. Most of all, a "planning-first, development-later" practice should be brought into place so that various experts could participate for a detailed planning. Public development should also be expanded so that beneficial public facilities could be set up in the first place. A system for reasonable development charges should also be come up with. In this process, the role of the administrators becomes yet more important for a long-term, systematic planning of future cities, accompanied by public housing developments.

• ETRI Journal
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• 제37권3호
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• pp.595-605
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• 2015

This paper proposes a robust, imperceptible block-based digital video watermarking algorithm that makes use of the Speeded Up Robust Feature (SURF) technique. The SURF technique is used to extract the most important features of a video. A discrete multiwavelet transform (DMWT) domain in conjunction with a discrete cosine transform is used for embedding a watermark into feature blocks. The watermark used is a binary image. The proposed algorithm is further improved for robustness by an error-correction code to protect the watermark against bit errors. The same watermark is embedded temporally for every set of frames of an input video to improve the decoded watermark correlation. Extensive experimental results demonstrate that the proposed DMWT domain video watermarking using SURF features is robust against common image processing attacks, motion JPEG2000 compression, frame averaging, and frame swapping attacks. The quality of a watermarked video under the proposed algorithm is high, demonstrating the imperceptibility of an embedded watermark.

• International Journal of Computer Science & Network Security
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• 제21권12호
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• pp.65-74
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• 2021

Digital image processing and retrieving have increasingly become very popular on the Internet and getting more attention from various multimedia fields. That results in additional privacy requirements placed on efficient image matching techniques in various applications. Hence, several searching methods have been developed when confidential images are used in image matching between pairs of security agencies, most of these search methods either limited by its cost or precision. This study proposes a secure and efficient method that preserves image privacy and confidentially between two communicating parties. To retrieve an image, feature vector is extracted from the given query image, and then the similarities with the stored database images features vector are calculated to retrieve the matched images based on an indexing scheme and matching strategy. We used a secure content-based image retrieval features detector algorithm called Speeded-Up Robust Features (SURF) algorithm over public cloud to extract the features and the Honey Encryption algorithm. The purpose of using the encrypted images database is to provide an accurate searching through encrypted documents without needing decryption. Progress in this area helps protect the privacy of sensitive data stored on the cloud. The experimental results (conducted on a well-known image-set) show that the performance of the proposed methodology achieved a noticeable enhancement level in terms of precision, recall, F-Measure, and execution time.

• Molecular & Cellular Toxicology
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• 제2권4호
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• pp.273-278
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• 2006

95 squamous cell lung carcinoma samples (normal tissue: 40 samples, tumor: 55 samples) were analyzed with 8 K cDNA microarray. 1-way ANOVA test was employed to select differentially expressed genes in tumor with FDR<0.01. Among the selected 1,655 genes, final 212 genes were chosen according to the expression fold change and used for following analysis. The expression of up-regulated 64 genes was verified with Reverse Transcription PCR and 10 genes were identified as candidates for SCC markers. In our opinion, those candidates can be exploited as diagnostic or therapeutic purposes. Gene Ontology (GO) based analysis was performed using those 212 genes, and following categories were revealed as significant biological processes: Immune response (GO: 0006955), antigen processing (GO: 0030333), inflammatory response (GO: 0006954), Cell adhesion (GO: 0007155), and Epidermis differentiation (GO: 0008544). Gene set enrichment analysis (GSEA) also carried out on overall gene expression profile with 522 functional gene sets. Glycolysis, cell cycle, K-ras and amino acid biosynthesis related gene sets were most distinguished. These results are consistent with the known characteristics of SCC and may be interconnected to rapid cell proliferation. However, the unexpected results from ERK activation in squamous cell carcinoma gripped our attention, and further studies are under progress.

• 디지털융복합연구
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• 제6권3호
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• pp.35-43
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• 2008

This research was to analyze information network which contributed Anyang Venture Valley's development. And mutual communication between regional innovated companies was the essential factor of this growth. Anyang city with its Knowledge Industry Promotion Agency, KIPA, has first set up communication network, facility and other structures to create basis of communication. For that, they were able to operate various networking and promotion of communication which led to the enforcement of regional innovation in venture businesses. During its innovation, KIPA played a key role as a link between regional Innovated companies, which enabled active interactions between them. Government can verify significance of establishing network base with mediation function for lively communication for promoting innovation capability through Anyang Venture Valley's case.

• 디지털융복합연구
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• 제10권5호
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• pp.177-183
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• 2012

IT 산업 기업간의 갈수록 치열해지고 있는 경쟁 환경에서 기업이 생존하기 위한 기술혁신은 경쟁력 확보를 위한 필수요소가 되고 있다. 이러한 기술혁신은 기업의 생존을 위해 반드시 필요하며 다양한 요인들이 기술혁신의 성공을 거두기 위해 반드시 고려되어야 한다. 본 고에서는 IT산업을 기반으로 기술 혁신에 영향을 미치는 요인을 파악하고 이러한 영향 요인에 관련된 다른 연구와의 비교 분석을 통해 새로운 연구모형을 설정하는 것을 목표로 하고 있다.