• Journal of the Korea Society of Computer and Information
• /
• v.19 no.12
• /
• pp.153-160
• /
• 2014

The Streganography method for digital images has to insert secret data into the image without image distortion. Side match method is that size of secret data is calculated by difference of embedded pixel value and mean value of side pixels. And the secret value is embedded into the embedded pixel. Therefore, the more secret data increases, the more image distortion increases, too. In this paper, we propose the enhanced method that calculates embedded pixel value by difference of secret value and mean value of side pixels. In proposed method, more secret data is embedded and image distortion has to decreases.

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.45 no.6
• /
• pp.162-169
• /
• 2008

Film restoration is to detect the location and extent of defected regions from a given movie film, and if present, to reconstruct the lost information of each regions. It has gained increasing attention by many researchers, to support multimedia service of high quality. Among artifacts, scratch is the most frequent degradation. In this paper, an automatic film line scratch removal system is developed that can detect and restore all kind of scratches. For this we use the spatial information of scratches: The scratch in old films has lower or higher brightness than neighboring pixels in its vicinity and usually appears as a vertically long thin line. Our systems consists of scratch detection and scratch restoration. The scratches of various types are detected by neural network based texture classifier and morphology-based shape filter and then the degraded regions are restored using bilinear interpolation. To assess the validity of the Proposed method, it has been tested with all kinds of scratches, and then experimental results show that the proposed approach is robust to various scratches and efficient to apply a real film removal system.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.27 no.5
• /
• pp.1107-1115
• /
• 2017

The most commonly used PKZIP format is a ZIP file, as well as a file format used in MS Office files and application files for Android smartphones. PKZIP format files, which are widely used in various areas, require structural analysis from the viewpoint of digital forensics and should be able to recover when files are damaged. However, previous studies have focused only on recovering data or extracting meaningful data using the Deflate compression algorithm used in ZIP files. Although most of the data resides in compressed data in the ZIP file, there is also forensically meaningful data in the rest of the ZIP file, so you need to restore it to a normal ZIP file format. Therefore, this paper presents a technique to recover a damaged ZIP file to a normal ZIP file when given.

• Journal of the Korea Convergence Society
• /
• v.10 no.6
• /
• pp.25-31
• /
• 2019

Because of its physical characteristics, earthquake has a great impact on a wide area in a short time, so it needs a resilience based seismic countermeasures to restore the community function. For this reason, in this study, the seismic damages of urban buildings were assessed stochastically by virtual earthquakes using public data information and disaster management program(Ergo-EQ). A geographical map reflecting geological characteristics of the target area was created with the buildings and topographic data in Dalseo-gu, Daegu City. In addition, an integrated database including building characteristics was modified to be linked with the Ergo-EQ program. The seismic damages for the buildings were evaluated through the exceedance probability of four different damage levels. From the damage results, it can be identified not only the seismic damage of each building, but also the major factors affecting earthquake damage.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.23 no.11
• /
• pp.1397-1406
• /
• 2019

In everyday mobile phone calls between the disabled and non-disabled people due to neurological impairment, the communication accuracy is often hindered by combining the accuracy of pronunciation due to the neurological impairment and the pronunciation features of the disabled. In order to improve this problem, the limiting method is MEMS (micro electro mechanical systems), which includes an induction line that artificially corrects difficult vocalization according to the oral characteristics of the language impaired by improving the word of out of vocabulary. mechanical System) Microphone device improvement. S/W improvement is decision tree with invert function, and improved matrix-vector rnn method is proposed considering continuous word characteristics. Considering the characteristics of H/W and S/W, a similar dictionary was created, contributing to the improvement of speech intelligibility for smooth communication.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2020.07a
• /
• pp.257-258
• /
• 2020

기존의 드론 조작은 초보자에게 어려웠다. 초보자의 경우 드론을 조종하다가 드론이 추락하거나 장애물에 걸려 프로펠러 등의 부품들이 손상되는 경우를 빈번하게 마주한다. 본 연구에서는 초보자 또한 드론 파손의 걱정 없이 드론의 조작을 더욱 쉽게 개선시키는 것을 전제로 뇌파와 보조입력인 음성인식을 이용한 드론 컨트롤러 기술을 적용하고자 한다. 현재 대중적으로 출시되어 있는 드론의 경우 호버링 기능을 포함시켜 드론의 추락 위험을 줄여주는 기능을 탑재하고 있다. 하지만 속도가 빠른 드론의 조작에 있어 미숙한 초보자들은 장애물과의 충돌 그리고 드론 착륙 시 기체손상 등의 위험에 대비하기 힘들다. 본 논문은 이러한 문제점들을 개선하기 위해 기존의 드론 컨트롤러 대신 특정한 동작을 상상할 때 발현되는 동작상상뇌파와 음성입력을 적용한 '동작상상뇌파와 음성인식을 이용한 드론 컨트롤러' 기술을 제안한다. 기존의 드론 컨트롤러와는 다르게 빅 데이터 처리기술인 머신러닝을 이용하여 뇌파 데이터를 처리하고 그 데이터들과 입력되는 뇌파 값을 비교하여 드론을 제어한다. 또한 뇌파의 발현이 안정적이지 못하는 상황을 대비한 보조입력인 음성인식을 이용하여 드론의 기체손상을 최소화 시킬 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2022.10a
• /
• pp.309-313
• /
• 2022

This study was attempted to analyze the status of emergency room use of severe trauma patients using the health insurance system and to understand their characteristics. This study used data from the 'Community-based Severe Trauma Surveillance' investigated from January 1, 2018 to December 31, 2019. As a result, there were differences in the degree of disability after injury and whether treatment(surgery, trauma embolism, transfusion) was performed according to the type of medical insurance (p< .001), it was found that there was a statistically significant difference between the degree of disability before and after damage depending on the type of medical insurance (p< .001). Reviews of the health insurance system located for the well-being of the people should be continued from various angles, and specific improvement plans should be proposed.

• Journal of the Korean Data and Information Science Society
• /
• v.7 no.1
• /
• pp.129-135
• /
• 1996

본 논문은 의뢰인의 Pilot Study를 상담한 것으로서 당뇨병 및 암 환자에게 효능이 있는 약으로 밝혀진 Steroid계통의 Methyl Prednisolone이 척수손상 환자에게 효능이 있는지를 알아보기 위해, 토끼를 실험대상으로 하여 얻은 반복측정자료를 분석하였다.

• Electric Engineers Magazine
• /
• v.219 no.11
• /
• pp.28-36
• /
• 2000

오늘날 전력에너지를 사용하고 있는 가정, 사무실 및 산업체 등 전력수요 전반에 걸쳐 전력품질에 민감하게 반응하는 다양한 전기설비들이 많이 사용되고 있다. 즉, 컴퓨터를 비롯한 정보관리시스템, 산업체 공정제어설비, 에너지관리시스템, 전자현금취급기 및 안전시스템 등은 전력품질 상태에 따라서 데이터 또는 기억내용 상실, 자료 송수신 오류 및 설비 손상이 발생하기도 한다.

• Proceedings of the Korea Society for Simulation Conference
• /
• 1999.04a
• /
• pp.237-241
• /
• 1999

본 논문은 이산사건 시스템 모델링에 관계대수를 이용함으로써 이산사건 시스템 모델을 시뮬레이션 할 때 data consistency를 보장하는 방법을 다룬다. 복잡한 이산사건 시스템은 모델링 및 분석에 형식론적인 프레임웍이 필요하며 모델의 추상화와 재사용이 용이한 DEVS형식론이 널리 사용되고 있다. 본 논문에서는 DEVS 형식론으로 기술된 모델을 정보의 손상 없이 관계대수형 모델로 변환하여 관계대수형 이산사건 모델로써 이용하는 방법론을 제시한다.