• 정보저장시스템학회논문집
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• 제1권2호
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• pp.143-149
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• 2005

In this paper we propose a novel volume hologram encryption system with binary amplitude masks rather than phase masks, in which volume holograms can be securely recorded against the attacks by a third party. In our system, the encryption is done by multiplexing two volume holograms in such a way that an original binary data page is first stored as a volume hologram by interference with a binary amplitude mask and then the complementary data page is stored as another volume hologram by interference with the complementary binary amplitude mask over the first hologram. The operation principle of our system is explained with the well-known theory of recording and reading a volume hologram in a photorefractive material and the experimental results are presented. Experimental data show that our encryption system is protected from blind decryptions by randomly-generated incorrect amplitude masks.

• 경영과학
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• 제32권4호
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• pp.57-67
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• 2015

It is a familiar Wall Street adage that "It takes volume to make prices move." Numerous researches have found the positive correlation between trading volume and price changes. Recent studies have documented that informed traders have strong influences on stock market prices through their trading with distinctive information power. Ever since 1992 capital market liberalization in Korea, it is said that foreign investors make consistent profits with their superior information and analytical skills. This study aims at whether we can make a profitable trading strategy by using the foreign investors' trading information. We analyse the relation between the KOSPI index returns and the foreign investors trading volume using GARCH models and VAR models. This study suggests the profitable trading strategies based on the documented relation between the foreign investors' trading volume and KOSPI index returns. We simulate the trading system with the real stock market data. The data include the daily KOSPI index returns and foreign investors' trading volume for 2001~2013. We estimate the GARCH and VAR models using 2001~2011 data and simulate the suggested trading system with the remaining out-of-sample data. Empirical results are as follows. First, we found the significant positive relation between the KOSPI index returns and contemporaneous foreign investors' trading volume. Second, we also found the positive relation between the KOSPI index returns and lagged foreign investors' trading volume. But the relation showed no statistical significance. Third, our suggested trading system showed better trading performance than B&H strategy, especially trading system 2. Our results provide good information for uninformed traders in the Korean stock market.

• 한국컴퓨터정보학회논문지
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• 제22권10호
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• pp.63-71
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• 2017

In this paper, we develop the system for audio volume equalization of video on demand(VoD) content and propose the solution for it. In recent years, there has been a steady increase in the number of VoD users in addition to linear channels. However, viewers ought to sit in an uncomfortable way, adjusting the volume intermittently while they are broadcasted. Sudden changes of volume occur between the broadcasting channels, the programs from the co-channel, or the linear channels and the VoDs. Especially, upsurged dissatisfaction from the televiewers has been found due to the unequalized volume when shifting between the linear channel and the VoD. In order to solve this problem, multilateral efforts were put forth, such as a system for keeping the volume at a certain level in digital broadcasting program has been legislated domestically. It leads success in equalizing linear channel volume. On contrary, too little notice has been taken for distorted volume problem of video on demand(VoD) content. In this paper, we developed and applied the volume equalization system into VoD content to achieve uniformization, a similar condition with linear channel(-24LKFS). This suggestion helped uneven current of volume which was in the stage -16 ~ -20LKFS to stable condition by lowering into the stage of -24LKFS. It also brought 20% increase in perspective of volume quality satisfaction level.

• 디지털산업정보학회논문지
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• 제5권2호
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• pp.51-76
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• 2009

In this paper, a new hybrid opto-digital multiple information hiding and real-time extracting system was suggested and implemented using a volume holographic optical correlator. The multiple information hiding system in which the multiple information can be hided in an arbitrary cover image was digitally implemented by using the combination of pseudo random sequence and Hadamard matrix. In addition, a real-time optical extraction system in which the hided multiple information in a cover image can be extracted in real-time was implemented by using a volume holographic optical correlator. In the VanderLugt-type holographic optical correlator used in this experiment, the multiful matched spatial filters corresponding each of the hided informations were recorded in a photorefractive crystal by using the moving window-based angular multiplexing scheme.

• 한국측량학회지
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• 제26권3호
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• pp.293-301
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• 2008

본 연구는 국가에서 많은 예산을 투입하여 구축한 KLIS 자료의 가격 산출에 목적이 있다. 이를 위해 가격 투입된 원가 분석을 수행하였으며, 판매량 및 회수율을 고려한 판매가와 정보량을 기준으로 한 판매가격을 산출하였다. 회수율을 고려했을 경우 많은 구임비용이 소요되었지만 정보량을 기준으로 하였을 경우에는 적은 비용이 소요되어 지리정보 활성화 측면을 고려하였을 때 정보량을 기준으로 하는 것이 타당함을 알 수 있었다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (A)
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• pp.67-69
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• 2004

본 논문은 Grid상의 workflow 시스템인 Workflow based Grid Portal for PSE(이하 WISE)를 이용한 인공 심장의 3차원 병렬 volume rendering system 디자인과 구현에 대하여 기술한다. Grid는 전 세계에 분산되어 있는 고성능, 대용량 자원들을 고속 네트워크로 연동하여 사용할 수 있게 하는 환경이며, WISE 시스템은 workflow 개념을 도입하여, 이런 자원들의 효율적이고 편리하게 관리해주고 아울러 여러 가지 패턴을 이용해 프로그래밍 할 수 있게 해주는 middleware이다. 본 논문에서는 Grid 상에서 WISE system에서 제공하는 프로그래밍 패턴을 이용하여 구조화되어 있지 않은 인공심장 데이터를 병렬 processing Pipeline 모델을 바탕으로 효율적인 parallel 3차원 가시화를 하기 위한 parallel pipelined volume rendering system을 구현하였다.

• 정보관리학회지
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• 제16권4호
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• pp.75-94
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• 1999

색인은 데이터베이스에 저장된 문서를 효과적으로 검색하기 위한 정보검색시스템의 필수 기능이다. 컴퓨터의 발달로 전자정보가 점점 많아짐에 따라 데이터베이스에 저장해야할 문서가 대량화되고 있고, 이러한 대용량 문서를 색인하기 위해서는 많은 시스템 자원과 처리 시간을 필요로 한다. 따라서 본 논문에서는 대용량 문서를 적은 자원으로 짧은 시간에 색인할 수 있는 개선된 텍스트분할에 의한 색인기법을 제안한다. 제안한 색인기법은 실제 검색시스템에 적용하고, 실험을 통해 우수성을 증명한다.

• 한국멀티미디어학회논문지
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• 제18권5호
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• pp.620-630
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• 2015

This research suggests a load balancing method for a volume rendering system which supports concurrent users. When concurrent users use a volume rendering server system, the computational resources are occupied by a particular user by turns because each process consumes the computational resources as much as possible. In this case, the previous method shows acceptable throughput but the latency is increased for each user. In this research, we suggest a method to improve the latency without performance degradation. Each process makes concessions for taking the resources according to the number of users connected to the system. And we propose a load balancing method in the dynamic situation in which the number of users can vary. Using our methods, we can improve the latency time for each user.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(5)
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• pp.77-80
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• 2001

In this paper, we devised volume pulse detection system which can quantitatively represent a artery elasticity for oriental clinic. Volume pulse wave detecter system consist of transducer which has IRLED-photodiode detecter, temperature sensor and filter and preprocessing circuits, data conversion and serial communication parts, and computer system. The high-pass filter are detect volume pulse wave and lowpass filter detect tissue thickness. The detected volume pulse wave are normalized by tissue thickness value with a division process. As the result of experiment, we can detect normalized volume pulse wave with effectively.

• 반도체디스플레이기술학회지
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• 제18권4호
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• pp.129-133
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• 2019

In this paper, we developed a system to monitor the storage capacity of suction-type device such as vacuum cleaner or crop harvesters. The monitoring system consists of load cells and a differential pressure sensor which simultaneously monitor the weight and volume of the stock. Since weighing objects stored in storage containers alone cannot fully monitor the level of filling, more accurate monitoring can be achieved by monitoring volume and fusion with weight information. The volume was monitored using a phenomenon in which the flow rate of the inhaled air varies depending on the volume of the object filled in the storage container. In this paper, we developed a system to monitor the storage in three stages: low, medium and high.