• Journal of Korea Society of Industrial Information Systems
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• v.20 no.5
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• pp.53-60
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• 2015

In this paper, the DCT based lossless image compression system which selects a limited number of DCT coefficients is proposed for the Lenna, Camerman, and Baboon image. The number of DCT coefficients to obtain a suitable image quality for the reconstructed image is computed by simulation. The image size of $256{\times}256$ are used in the experiment. The PSNR values for the reconstructed image by selecting limited number of DCT coefficients are found. It is shown that the minimun number of the coefficients for Lenna, Cameramen Baby and Babbo image to obtain PSNR=30 are N=16, 32, 37, 55, respectively. The result can provide the guideline of the importance of the DCT coefficient toward the compression for the tested image of the Lena, Cameraman, and Baboon.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2017.11a
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• pp.479-479
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• 2017

본 연구는 벤처기업의 매출액의 영향요인에 대하여 기업 내 자원을 범주화하여 그 영향력을 검증하고, 나아가 기업이 보유한 역량을 2개의 차원으로 구분하여 각 차원에 따른 집단 간 벤처기업성과 영향요인의 차이를 확인하고자 하였다. 즉, 기업이 보유하는 역량인 기술, 가격, 품질, 디자인, 조직관리, 마케팅 경쟁력에 대하여 요인분석을 통해 기술역량과 경영역량 차원을 도출하였고, 군집화 과정을 거쳐 각 역량 수준에 따른 네 개의 벤처기업 집단을 분류하였다. 네 개의 집단은 기술-경영 우위, 기술주도, 경영주도, 기술-경영 열위로 나뉘었다. 이후 성과 영향요인들을 자원기반이론의 관점에서 기업현황, 기업가자원, 인적자원, 재무자원, 기술자원, 외부자원의 여섯 개의 상위 범주로 구분하였고, 각 범주에 포함되는 세부 요인들이 매출액에 미치는 영향을 '벤처기업정밀실태조사'의 2개년 데이터를 활용하여 분석하였다. 분석 결과 첫 번째, 전체 벤처기업을 대상으로 분석한 결과 모형에 투입된 33개의 변수들 중 22개의 변수가 벤처기업 매출액에 유의한 영향을 미치는 것이 확인되었다. 두 번째, 기업 역량 차원 분류에 따른 기업 집단 간 영향요인 차이를 분석한 결과, 매출액 영향요인은 입력된 33개의 독립변수 중 최대 13개에서 최소 8개로, 기업 역량 차원에 따른 매출액 영향요인의 차이가 확인되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.41-44
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• 2013

As appearance of high-quality service such as UDTV application, high-speed and high-capacity communication services are required. For this, communication systems increase the data processing speed and use various error correction techniques. In this paper, we implement the Viterbi decoder applied in 1000BASE-T with 4 pairs UTP cable. The minimum operating speed of the Viterbi decoer should be more than 125 MHz because 125 MHz PAM-5 signal is transmitted on each pair of cables in 1000BASE-T. To do this, we implement the decoder by using the pipeline and parallel processing and verify the operation with 125 MHz by using a logic analyzer. Finally, we will show that the decoder recovers the original data for the added random error data.

• Korean Journal of Community Nutrition
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• v.14 no.1
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• pp.114-122
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• 2009

The purpose of this study was to identify the factors of university residence hall foodservice quality which has correlations with subjective QOL (quality of life) of target customers. A total of 176 questionnaires from students of 4 universities in Daegu, Gyeongbuk area were used for the analysis. The male students using residence hall foodservices were highly satisfied with 'clean appearances of employees' ($4.86{\pm}1.25$) and 'clean facilities' ($4.79{\pm}1.26$), while the degree of satisfaction with 'convenient facilities' ($4.50{\pm}1.20$) showed the highest score with female students. Ranking analysis using Spearman's ${\rho}$ revealed that there were significant correlations between students' satisfactions with the dimensions of 'foods and kindness of employees', 'hygiene', 'nutrition', and 'convenience' and their QOL, even though physical QOL of female students showed no significant correlation with satisfaction towards residence hall foodservices. As a conclusion, there should be efforts to improve the QOL of target customers through foodservice quality management.

• Magazine of the Korea Concrete Institute
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• v.6 no.4
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• pp.131-140
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• 1994

Recently, tunnels are increasingly constructed in this country with the increased construction of highways, high-speed railways and subways. Shotcreting is one of the major processes in the tunnel construction. Many problems, however, exist in the current shotcreting practice. The purpose of the present study is, therefore, to explore the problems in the current shotcreting practice, to derive an optimum mix for efficient shotcreting, To this end, extensive experimental study has been conducted. Optimum mixes with high quality and economy were derived. The present study provides a firm bast: in our country to apply high-quality shotcrete in tunnel construction.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.4
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• pp.621-629
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• 2001

In this thesis a wireless data transmission system has been proposed and analysed that uses the multi-carrier technique with the adaptive modulation scheme. In general, the OFDM(Orthogonal Frequency Division Multiplexing) system is assigning a same amount of information to all sub-carriers in a wireless data transmission. In the proposed system, the different amount of information is assigned to each sub-carrier depending on the state of channel and the target probability of error of system. With the proposed scheme, the transmission rate can be maximized with the fixed power and the required power to transmit the information can be minimized with the target probability of error of system.

• The Korean Journal of Food And Nutrition
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• v.17 no.4
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• pp.436-441
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• 2004

As the production of agricultural products showing high quality and environmental safety is required increasingly these days, it is really necessary to study on technology for producing agricultural products which are safe microbiologically. Among several sanitizing reagents contacted easily, we investigated the most effective and useful method for reducing microorganisms by sanitizer treatment. From this study, it was showed that treatment of 3% hydrogen peroxide solution over 1 minute, which decreased microbiological level less than one tenth of natural state(no sanitizer treatment) in all microorganisms tested, was the most effective sanitizing method to green vegetables, especially raw lettuce used in this study, for reducing microorganisms. By utilizing this sanitizing method in farming step, the improvement of safety and added value of agricultural products, especially raw green vegetables, is expected.

• Journal of Advanced Navigation Technology
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• v.14 no.6
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• pp.845-850
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• 2010

In this paper, a method for transmitting layered SVC streams in differentiated MBSFN channels is presented. Scalable coded video streams are transmitted in modulation channels of different efficiency that it achieves reduced resource consumption compared to non-scalable AVC stream. When utilizing with Raptor FEC, the combined effect is enhanced service coverage with providing minimum video quality at the edge of the service area, than the case of AVC.

• KIPS Transactions on Computer and Communication Systems
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• v.5 no.9
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• pp.237-246
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• 2016

DIBR (Depth Image Based Rendering) is a multimedia technology that generates the virtual multi-view images using a color image and a depth image, and it is used for creating glasses-less 3-dimensional display contents. This research describes the effect of depth accuracy about the objective quality of DIBR-based multi-view images. It first evaluated the minimum depth quantization bit that enables the minimum distortion so that people cannot recognize the quality degradation. It then presented the comparative analysis of non-uniform domain-division quantization versus regular linear quantization to find out how effectively express the accuracy of the depth information in same quantization levels according to scene properties.

• Journal of the Korea Safety Management & Science
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• v.5 no.4
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• pp.169-185
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• 2003

Recently many researchers contributed to the understanding of Quality Control System, but the use of economics in the design of quality assurance system is limited in treatment of the relationship between the average incoming quality level (or average process quality level) of the incoming lot and the average outgoing quality level of this lot. In this study, a traditional concept of sampling inspection plan for the quality assurance system is extended to a consideration of economic aspects in total production system by representing and analyzing the effects between proceeding and succeeding production process including inspection process. This approach recognizes that the decision at each manufacturing process (or assembly process), is to be determined not only by the cost and the average outgoing quality level of that process, but also by the input parameters of the cost and the incoming quality to the succeeding process. By analyzing the effects of the average incoming and outgoing quality, manufacturing or assembly process quality level and sampling inspection plan on the production system, mathematical models and solution technique to minimize the total production cost for a general product manufacturing system with specified average outgoing quality limit are suggested.