• 한국정보통신학회논문지
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• 제7권1호
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• pp.142-148
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• 2003

병원에서 발생하는 대용량 의료영상들을 저장 및 전송 할 경우에 저장 매체 수요의 증가와 네트워크 속도의 저하 등의 문제점들이 야기된다. 이러한 문제점들을 해결하기 위한 방안으로 의료영상의 압축이 필요하게 되었다. 본 논문에서는 개개의 여러 압축방법들로 하나의 통합된 환경에서 다양한 종류의 의료영상들을 압축할 수 있는 통합압축환경시스템을 설계 및 구현하였다. 이 통합압축환경에 구현된 압축방법들 중에는 DICOM 3.0규약을 따르는 RLC, 무손실 JPEG 압축방식, JPEG방식들이 있다. 그리고 JPEG2000에 사용되어진 이산웨이블릿변환을 이용한 압축방식과 병 변에 대한 정확성을 높이고 압축률을 좋게 하기 위해서 하나의 영상에서 무손실 압축과 손실 압축을 동시에 하는 방법을 제안하였다. 그리고 영상 정보를 효율적 관리할 수 있게 데이터베이스와 연동이 가능하도록 하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제18권1호
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• pp.25-33
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• 2012

As of November 1st 2010, 59% of overall residences in Korea are apartments with 8,185,000 households and when including the multi-unit houses, 71.0% of the overall residences are multifamily houses. The apartments have become the most universal form of residence in Korea and its' relative weight will continuously increase in the future. Meanwhile, Korea has turned into aging society in 2000 and will turn into the super-aged society by 2026 to display the world's fastest speed for aging. Majority of the elderly will spend their declining years in apartments. To understand the residence consciousness and its' properties for unit housing of the elderly residing in apartments, the present study obtained the following results through surveying the 541 nationwide samples. First, the elderly most prefer the mid and high levels(6-9th floors, or 10-15th floors) of apartments. Second, the elderly couples most prefer areas of $85m^2$ while single elderly most prefer $60m^2$. Third, the elderly feel the most inconveniences in bathrooms and showers. Fourth, safety accidents in dwelling of the elderly have no significant correlation with age, gender or their possessed diseases. Fifth, the elderly displayed high satisfaction for their bedrooms. Sixth, there were less tendencies for elderly to feel lack of storage spaces or conduct remodeling. As a result of the analysis, all apartment houses of Korea must support the physical aging of residents and prevent safety accidents in houses to enable Korean aging in place.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권2호
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• pp.610-630
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• 2020

A large number of people suffered from traffic accidents each year, so people pay more attention to traffic safety. However, the traditional methods use laser sensors to calculate the vehicle distance at a very high cost. In this paper, we propose a method based on deep learning to calculate the vehicle distance with a monocular camera. Our method is inexpensive and quite convenient to deploy on the mobile platforms. This paper makes two contributions. First, based on Light-Head RCNN, we propose a new vehicle detection framework called Light-Car Detection which can be used on the mobile platforms. Second, the planar homography of projective geometry is used to calculate the distance between the camera and the vehicles ahead. The results show that our detection system achieves 13FPS detection speed and 60.0% mAP on the Adreno 530 GPU of Samsung Galaxy S7, while only requires 7.1MB of storage space. Compared with the methods existed, the proposed method achieves a better performance.

• Journal of Information Processing Systems
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• 제13권3호
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• pp.533-545
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• 2017

Massive volumes of GPS trajectory data bring challenges to storage and processing. These issues can be addressed by compression algorithm which can reduce the size of the trajectory data. A key requirement for GPS trajectory compression algorithm is to reduce the size of the trajectory data while minimizing the loss of information. Synchronized Euclidean distance (SED) as an important error measure is adopted by most of the existing algorithms. In order to further reduce the SED error, an improved algorithm for open window time ratio (OPW-TR) called local optimum open window time ratio (LO-OPW-TR) is proposed. In order to make SED error smaller, the anchor points are selected by calculating point's accumulated synchronized Euclidean distance (ASED). A variety of error metrics are used for the algorithm evaluation. The experimental results show that the errors of our algorithm are smaller than the existing algorithms in terms of SED and speed errors under the same compression ratio.

• Journal of Information Technology Applications and Management
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• 제11권2호
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• pp.29-43
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• 2004

As the development of an information technique, gradually, mobile device is going to be miniaturized and operates at high speed. By such the requirements, the devices using a flash memory as a storage media are increasing. The flash memory consumes low power, is a small size, and has a fast access time like the main memory. But the flash memory must erase for recording and the erase cycle is limited. JFFS is a representative filesystem which reflects the characteristics of the flash memory. JFFS to be consisted of LSF structure, writes new data to the flash memory in sequential, which is not related to a file size. Mounting a filesystem or an error recovery is achieved through the sequential approach. Therefore, the mounting delay time is happened according to the file system size. This paper proposes a MJFFS to use a multi-checkpoint information to manage a mass flash file system efficiently. A MJFFS, which improves JFFS, divides a flash memory into the block for suitable to the block device, and stores file information of a checkpoint structure at fixed interval. Therefore mounting and error recovery processing reduce efficiently a number of filesystem access by collecting a smaller checkpoint information than capacity of actual files. A MJFFS will be suitable to a mobile device owing to accomplish fast mounting and error recovery using advantage of log foundation filesystem and overcoming defect of JFFS.

• JSTS:Journal of Semiconductor Technology and Science
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• 제15권1호
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• pp.68-76
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• 2015

Phase-change memory (PCM) is a promising technology that is anticipated to be used in the memory hierarchy of future computer systems. However, its access time is relatively slower than DRAM and it has limited endurance cycle. Due to this reason, PCM is being considered as a high-speed storage medium (like swap device) or long-latency memory. In this paper, we adopt PCM as a virtual memory swap device and present a new page replacement policy that considers the characteristics of PCM. Specifically, we aim to reduce the write traffic to PCM by considering the dirtiness of pages when making a replacement decision. The proposed replacement policy tracks the dirtiness of a page at the granularity of a sub-page and replaces the least dirty page among pages not recently used. Experimental results with various workloads show that the proposed policy reduces the amount of data written to PCM by 22.9% on average and up to 73.7% compared to CLOCK. It also extends the lifespan of PCM by 49.0% and reduces the energy consumption of PCM by 3.0% on average.

• 디지털산업정보학회논문지
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• 제5권2호
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• pp.21-28
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• 2009

This paper proposes RCBT(Reduced Compact Binary trie) to correct faults of CBT (Compact Binary trie). First, in the case of CBT, a compact structure was tried for the first time, but as the amount of data was increasing, that of inputted data gained and much difficulty was experienced in insertion due to the dummy nodes used in balancing trees. On the other hand, if the HCBT realized hierarchically, given certain depth to prevent the map from increasing onthe right, reached the depth, the method for making new trees and connecting to them was used. Eventually, fast progress could be made in the inputting and searching speed, but this had a disadvantage of the storage space becoming bigger because of the use of dummy nods like CBT and of many tree links. In the case of RCBT in this thesis, a capacity is increased by about 60% by completely cutting down dummy nods.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.479-483
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• 2006

As high-definition television(HDTV) broadcasting were generalized, there have been many researches and developments about large storage capacity and fast data transfer rate in optical disk drives(ODD). Pickup actuators must have high flexible mode frequencies and gain margins. Flexible modes are caused by the flexibility of moving parts in the actuator and a servo bandwidth is limited by them. As a result, the system becomes unstable for high-speed operations in high density reading and recording. In this paper, we suggest improved modeling method that considers the bonding layer. And, flexible mode frequency of actuator is improved by Design of Experiment of lens holder. Magnet circuit is designed considering the relation with moving part. Through improving yoke design, the magnetic flux is changed and DC tilt is reduced. Consequently, we designed actuator which has high flexible mode frequency and gain margins.

• Asian-Australasian Journal of Animal Sciences
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• 제23권7호
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• pp.833-847
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• 2010

In the past decade, there have been many advances in whole-genome sequencing in domestic animals, as well as the development of "next-generation" sequencing technologies and high-throughput genotyping platforms. Consequently, these advances have led to the creation of the high-density SNP array as a state-of-the-art tool for genetics and genomics analyses of domestic animals. The emergence and utilization of SNP arrays will have significant impacts not only on the scale, speed, and expense of SNP genotyping, but also on theoretical and applied studies of quantitative genetics, population genetics and molecular evolution. The most promising applications in agriculture could be genome-wide association studies (GWAS) and genomic selection for the improvement of economically important traits. However, some challenges still face these applications, such as incorporating linkage disequilibrium (LD) information from HapMap projects, data storage, and especially appropriate statistical analyses on the high-dimensional, structured genomics data. More efforts are still needed to make better use of the high-density SNP arrays in both academic studies and industrial applications.

• 한국멀티미디어학회논문지
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• 제10권1호
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• pp.1-12
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• 2007

모바일 환경의 제한된 자원 하에서 멀티미디어 데이터를 이용하기 위해서는 XML로 표현되는 MPEG-7 문서의 효율적인 관리 방법이 필요하다. 이 때 XML 문서 클러스터링 방법들을 이용할 수 있겠으나 보다 효율성을 높이기 위해 MPEG-7 문서의 특성을 반영한 새로운 클러스터링 방법이 요구된다. 새로운 클러스터링은 모바일 환경에서 멀티미디어 검색시 질의 처리 속도가 향상되며 다양한 응용에 적합한 문서 저장이 가능하다. 본 논문에서는 대용량의 멀티미디어 데이터를 MPEG-7 문서로 효율적으로 관리하기 위해 MPEG-7 문서의 엘리먼트들 사이에 나타나는 의미 관련성을 이용해 저장할 수 있는 새로운 클러스터링 방법을 제안하고, 이를 기존 방법들과 비교하였다.