• 정보처리학회논문지B
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• 제9B권5호
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• pp.533-540
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• 2002

인터넷 전자상거래의 발달로 데스크 탑 컴퓨터만이 아니라 냉장고, 달리는 차 안, PDA 휴대 전화 등 생활 영역 곳곳에서도 전자상거래를 할 수 있다. 다양한 기기들에서 전자상거래를 하기 위해 쇼핑몰들은 여러 화질의 이미지를 제공해야 한다. 현재의 전자상거래 시스템을 같은 상품 이미지라도 쇼핑몰들이 각각 저장하고 있다. 웹 이미지 서버는 쇼핑몰이 더 이상 이미지를 저장하지 않도록 이미지를 제공하는 중앙 집중적인 이미지 저장소이다. 따라서, 웹 이미지 서버를 이용하면 여러 쇼핑몰의 저장공간을 간편화할 수 있다. 또한, 이미지를 효율적으로 사용할 수 있고 쇼핑몰의 이미지의 갱신과 관리가 쉽게 이루어질 수 있다. 본 논문에서는 기존에 구현된 웹 이미지 서버를 쇼핑몰 관리 기능, 사용자 로그 기록 기능과 이미지 카탈로그 기능을 추가하여 확장하였고, 웹 서버 성능 평가 툴인 WAS를 이용하여 웹 이미지 서버 시스템의 응답시간을 측정하여 비교하였고, 사용자를 계속 증가시켜 웹 이미지 서버의 안전성을 평가하였다.

• 한국콘텐츠학회논문지
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• 제16권6호
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• pp.529-536
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• 2016

본 연구의 목적은 차별적 경찰대응전략의 품질을 평가하는 것이다. 새로운 경찰대응시스템이 도입된 지 약 3년이 지났지만, 이를 실증적으로 평가한 연구는 미비한 실정이다. 2가지 종류의 통계적 품질관리 기법을 활용하여, 2012년 한해동안 익산경찰서에 신고된 약 3,000건의 경찰데이터를 분석하였다. "Xbar-R 관리도"의 분석결과, 경찰은 긴급출동신고전화 (Code 1)에 지속적으로 신속히(3분 이내) 대응하지 못하는 것으로 나타났다. 더불어 "P 관리도"의 분석결과, 경찰은 비긴급출동신고전화 (Code 2)에 5분이내로 대응하지 못한 출동건수의 월별 상이성이 큰 것으로 나타났다. 본 연구에서 알 수 있듯이 경찰이 추구하는 "신속한" 수준의 대응전략에 있어 코드별 목표대응시간에 대하여 재검토 할 필요성이 제기된다.

• Journal of Biosystems Engineering
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• 제43권4호
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• pp.394-400
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• 2018

Purpose: This research evaluated five types of nanoparticles to develop a surface-enhanced Raman spectroscopy (SERS) method for the rapid detection of two Bacillus species (Bacillus cereus and Bacillus thuringiensis) that are commonly found on fresh produce, which can cause food poisoning. Methods: Bacterial concentrations were adjusted to a constant turbidity, and a total of $30{\mu}L$ of each Bacillus cell suspension was prepared for each nanoparticle. A point-scan Raman system with laser light source of wavelength 785 nm was used to obtain SERS data. Results: There was no qualitative difference in the SERS data of B. cereus and B. thuringiensis for any of the five nanoparticles. Three gold nanoparticles, stabilized in either citrate buffer or ethanol, showed subtle differences in Raman intensities of two Bacillus species at $877.7cm^{-1}$. Conclusions: Among the three types of nanoparticles, the gold nanoparticles stabilized in citrate buffer showed the lowest standard deviation, followed by gold nanoparticles stabilized in ethanol. This result supports the potential application of gold nanoparticles for SERS-based detection of B. cereus and B. thuringiensis.

• 한국병원경영학회지
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• 제27권3호
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• pp.39-49
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• 2022

Purposes: This study purposed to analyze the relationship between patient safety and patient-centerendess. Methodology: The comprehensive scores from patient safety assessment program and patient experience survey conducted by Health Insurance Review & Assessment Service were used as independent variables and dependent variables. This study analyzed the relationship between 4 patient safety-related areas(i.e. risk standardized readmission ratio, intensive care unit, preventive antibiotic, the drug evaluation) and 6 patient experience areas(i.e. nurse services, doctor services, medication & treatment, hospital environment, patient's right, overall experience) by using robust regression analysis. Findings: According to results, the score in 'patient's right' and 'risk standardized readmission ratio' areas were found to have a significant relationship, and 'overall experience' and the 'preventive antibiotic' areas. The ratio of senior beds and specialists was a general characteristics of hospitals that had a significant relationship on patient experience assessment. Practical Implication: The relationships between patient safety and patient experience assessment were varied depending on areas. Further study is needed to make clear the supposed relationship.

• 동아시아식생활학회지
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• 제20권6호
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• pp.863-872
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• 2010

The overall effects of three different beers on white bread were examined in terms of mixograph, pH, fermentation rate, TPA, crumbScan, colorimeter, sensory evaluation, and the hardness of bread through different storage times (0, 1, 2, 3 days), and texture as measured by texture analyzer. According to mixograph, the control (CON), black beer stout (BOB) and Asahi beer (AOB) but not max beer (MOB) were found to be proper between 3 and 5 minutes of peak time. All samples for peak value were at the level of over 60%. AOB showed the highest specific volume, and was the lowest in hardness (i.e. highest in softness) by TPA and storage days. In sensory evaluation, the difference test showed that AOB had the best volume, springiness, moistness, and softness. Moreover, in an overall preference test AOB scored the highest points in texture, flavor, taste, and overall acceptance.

• 한국통신학회논문지
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• 제35권2B호
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• pp.352-360
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• 2010

IPTV나 Mobile IPTV 같은 IP 기반의 방 통 융합형 멀티미디어 서비스는 사용자 인지적 QoE가 보장된 서비스를 제공하는 것이 절실하다. 본 논문에서는 실시간 Mobile IPTV 서비스시 다양한 IP망의 조건에 따라 발생하는 에러의 영향으로 열화된 컨텐츠의 손상 정도를 보다 정확하고 효율적으로 평가하기 위한 방안을 제안하였다. QoE를 고려한 실시간 전송시 측정을 위해서 손상된 프레임의 효율적 정합 및 측정 방법을 보여 주었다. 제안된 알고리즘은 실시간 전송 스트림의 각 프레임으로 부터 디지털화된 컨텐츠의 밝기 정보를 추출하여 분석하며 블러, 블록, 에지 비즈니스, 컬러 에러 등 QoE 요소들을 RR 기반의 측정 파라메터로 활용하여 평가하였다. 제안된 방안의 정확성을 증명하기 위해서 원 소스 컨텐츠와 손상된 컨텐츠를 비교 분석하였다.

• 한국조리학회지
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• 제13권2호
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• pp.98-109
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• 2007

Consumers purchase bakery products and evaluate them with various wants and needs when they need them. It shows that there are changes and improvements in quality factors like nutritional consideration rather than simply eating for survival. The purpose of this study was to research how well the consumers perceive necessary nutritional information, how nutritional information on bakery products affects the consumers' perceived risk and evaluation, and how consumers' perceived risk on bakery products affects their evaluation on them. The research was done through surveys for the people in the Busan Metropolitan area. 200 out of 250 answers were used in analyzing frequency, factor, and simple regression through SPSS Win 10. The findings were as follows; first, the more nutritional information consumers have, the less perceived risk they feel, i.e., positive nutritional information affects reducing the consumers' perceived risk. Second, as perceived risk gets reduced, consumers' evaluation on bakery products has meaningful influence on their perceived risk level. Third, these consumers' perceived risk affects their evaluation on bakery products meaningfully. The results of this study can be the meaningful base of information sources in establishing marketing strategies in bakery industry.

• Journal of Communications and Networks
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• 제10권3호
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• pp.287-296
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• 2008

The IEEE 802.11 wireless standard uses the carrier sense multiple access with collision avoidance (CSMA/CA) as its MAC protocol (during the distributed coordination function period). This protocol is an adaptation of the CSMA/CD of the wired networks. CSMA/CA mechanism cannot guarantee quality of service (QoS) required by the application because orits random access method. In this study, we propose a new MAC protocol that considers different types of traffic (e.g., voice and data) and for each traffic type different priority levels are assigned. To improve the QoS of IEEE 802.11 MAC protocols over a multi-channel CSMA/CA, we have developed a new admission policy for both voice and data traffics. This protocol can be performed in direct sequence spread spectrum (DSSS) or frequency hopping spread spectrum (FHSS). For voice traffic we reserve a channel, while for data traffic the access is random using a CSMA/CA mechanism, and in this case a selective reject and push-out mechanism is added to meet the quality of service required by data traffic. To study the performance of the proposed protocol and to show the benefits of our design, a mathematical model is built based on Markov chains. The system could be represented by a Markov chain which is difficult to solve as the state-space is too large. This is due to the resource management and user mobility. Thus, we propose to build an aggregated Markov chain with a smaller state-space that allows performance measures to be computed easily. We have used stochastic comparisons of Markov chains to prove that the proposed access protocol (with selective reject and push-out mechanisms) gives less loss rates of high priority connections (data and voices) than the traditional one (without admission policy and selective reject and push-out mechanisms). We give numerical results to confirm mathematical proofs.

• 한국항행학회논문지
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• 제11권3호
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• pp.306-312
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• 2007

현재의 TCP/IP 네트워크는 인터넷 사용자와 다양한 유형의 트래픽 증가로 지연과 병목 현상을 겪고 있어 서비스의 품질 문제가 부각되고 있다. 이와 같이 네트워크 활용도가 증가하면서 안정적인 네트워크 서비스 기반 구축에 대한 요구가 더욱 거세지고 있으며 관리자에게는 최적의 네트워크 운용과 관리를 위한 효율적인 트래픽 제어와 대역폭 관리가 절실하게 필요하게 되었다. 이러한 문제들을 해결하기 위해 지금까지는 회선의 대역폭을 증설하는 것 외에 별다른 방법이 없었다. 하지만 이러한 회선의 증설은 높은 비용 부담을 감당해야 하며 지속적으로 증가하는 트래픽 문제를 해결하는 데 한계가 있다. 본 논문에서는 이러한 문제점을 향후에 널리 사용될 802.16e(휴대인터넷) 기반 하에서 해결하는 방법을 제시한다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2004년도 추계학술대회 및 정기총회
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• pp.463-466
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• 2004

This paper suggests the evaluation method of success factors of CRM implementation using AHP technique, and presents why firms implement CRM, how it could be successfully implemented, and what is the most important factor. For the purpose, this study applies the method to department stores' industry. AHP structure consists of three steps to determine CRM's key success factors. First of all, strengthening loyalty of customers, improvement of service quality, upgrade of intelligence system and advancement of management process are selected as superordinate object (i.e. CRM-implementation goal). The next project factor, technology/data factor and organizational factor were decided as success factor of CRM-implementation. Subordinate criteria of project factor consist of 11 criteria. The experimental results of this study show that department stores think advancement of management process and improvement of service quality as most important purposes for CRM implementation. The results also indicate that among the subordinate success factors, accuracy of customer information, conversion to customer-oriented business model, practical use of experienced consultant, and establishing IT infrastructure for CRM are evaluated as most important success factors for CRM implementation.