• Journal of Digital Convergence
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• 제17권12호
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• pp.117-127
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• 2019

This study was done to analyze the relationship among the characteristic elements for a evaluation factor(design, function, quality, price, conveniency, personnel factor), the evaluation factor satisfaction, repurchase intention and recommend intention that the China cellular phone users perceived by group. The survey was divided into "design, function, quality, price, conveniency, personnel factor, repurchase intention and recommend intention". As a study result, every characteristic elements for a evaluation factor excepting price had an effect on independent variables such as design, function, quality, conveniency, personnel factor satisfaction. And all evaluation factors had an effect on repurchase and recommend intention. In conclusion, in order to increase the repurchase and recommend intention in China cellular phone market it would be necessary to improve the characteristic elements satisfaction for design, function and personnel factor. And after the design, function and personnel factor satisfaction were improved, we could improve the repurchase and recommend intention.

• Journal of Information Technology and Architecture
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• 제10권4호
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• pp.537-552
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• 2013

Software-as-a-Service (SaaS) has led to paradigm shifts in the information management area by combining it with SOA and Mashup. System developers now have more chances to access various high-quality functions through API opened on the web. But external resources are controlled by service providers so that it raises the component's uncertainty in system management which is related to external resources. In the cloud environment, components related to external resources causes negative effects on system's maintainability by making them dependant on service providers. This study proposes a way to enhance maintainability by using stable external resources. For this work, we suggest the N+1-tier model in which an external resource tier is added to the N-tier model. After that, we analyze how adding an external resource tier affects the decreasing complexity of maintainability and improving maintainability on web application.

• Korean Journal of Food Science and Technology
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• 제38권1호
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• pp.28-34
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• 2006

Effects of various surface sterilization and washing methods on sterilization of fresh chicory surface were evaluated. Fresh-cut chicory was washed with tap water for 1 min, 100 ppm chlorinated water, and 3 ppm ozonated water using mechanical washing machine for 3 min, packed with bi-axially oriented polypropylene (OPP 0.04 mm) film, and stored for 3 weeks at 4 and $10^{\circ}C$. Tap water washing resulted in approximately 1 log CFU/g reduction of microbial load, and ozonated water and chlorinated water treatments resulted in additional 2 log CFU/g reduction.

• Journal of the Korean Applied Science and Technology
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• 제35권4호
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• pp.1013-1030
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• 2018

Biodiesel is a fuel produced in the form of a fatty acid methyl ester by using raw materials such as animal fat, vegetable oil and its by-products, and is being seen as a biofuel that can replace petroleum energy. However unsaturated fatty acid methyl esters in biodiesel causes to oxidize during storage and distribution, resulting in poor fuel quality and corrosion of vehicle engine components. In this study, the influence of quality and oxidation characteristics of biodiesel on the oxidation stability is investigated and the evaluation method related it is described. We also propose a method to improve the drawback of oxidation stability in biodiesel.

• Proceedings of the Plant Resources Society of Korea Conference
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• 한국자원식물학회 2020년도 추계국제학술대회
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• pp.75-75
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• 2020

여주(Momordica charantia L.)는 인도 동부와 남중국 등 열대 아시아 지역이 원산지로, 열대 및 아열대를 비롯하여 온대 지역까지 널리 재배되며, 열매를 식용으로 하여 주로 채소로 재배되고 있는데, 쓴맛 때문에 '쓴오이' 라고도 부르지만 당뇨와 고혈압 등 성인병과 장 기능 개선 성분을 함유하고 있다고 알려지는 등 건강기능성 작물로 국내에서도 전국적으로 재배가 되고 있어서, 국내 재배현황과 재배농가의 실태를 조사하여 재배 애로사항 및 발전과제를 도출코져 하였다. 여주의 국내 재배는 2012년 재배면적이 10ha에서 빠르게 증가하여 2017년 606농가 107.9ha로 정점을 이루고, 점차 감소하여 2019년 232농가 59.9ha에서 재배 하였으며, 2019년 재배면적이 많았던 시군은 함양, 강진, 양주, 천안 등 이었다. 여주의 재배작형은 보통재배(육묘후 노지재배) 농가가 가장 많고, 노지재배(직파), 반촉성재배(조숙재배), 촉성재배 형태의 농가가 있는데, 보통재배(육묘후 노지재배)는 3월 하순~4월 상순에 파종 및 육묘한 후 5월상순 노지에 정식하여, 6월 하순부터 가을에 서리가 내리기 전까지 수확한다. 농가의 재배품종은 일본 등 외국도입종의 종자를 종자회사로 부터 구입하여 재배하고 있으며, 재식방법, 시비관리, 줄기유인 등 표준재배법이 정립되지 못하여 농가별로 다양한 방법으로 재배하고 있는 실정이다. 수확은 열매가 완전히 익기전에 생여주 상태에서 수확하고 있으며, 일반 재배농가는 생여주 판매가 10~20%, 건여주 판매가 80~90% 비율이며, 생여주로 100% 건조업체에 판매하기도 하고, 건여주로 100% 건조하여 판매하는 농가도 있다. 국내재배 안전성 향상을 위하여 필요시 되는 기술개발 과제는 용도별 품종육성 및 종자생산 보급, 고품질 여주 생산을 위한 재배관리 기술, 지역별 생산 여주과실의 성분 품질관리 및 건조 가공기술, 여주의 건강기능성 식품 지정 고시 방안 등으로 전문기관에서의 연구개발이 필요하다.

• Journal of Korean Society for Quality Management
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• 제51권4호
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• pp.515-530
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• 2023

Purpose : This research aims to develop a data-driven inspection policy for radio stations utilizing the KS Q ISO 2859-1 sampling method, addressing potential regulatory relaxations and impending management challenges. Methods : Using radio station inspection big data from the past six years, we established a simulation model to evaluate the current policy. A new inspection sampling policy framework was designed based on the KS Q ISO 2859-1 method. The study compares the performance of the current and proposed inspection systems, offering insights for an improved inspection strategy. Results : This study introduced a simulation model for inspection system based on the KS Q ISO 2859-1 sampling method. Through various experimental designs, key performance indicators such as non-detection rate and sample proportion were derived, providing foundational data for the new inspection policy. Conclusion : Using big data from radio station inspections, we evaluated current inspection systems and quantitatively compared a new system across diverse scenarios. Our simulation model effectively verified the feasibility and efficiency of the proposed framework. For practical implementation, essential factors such as lot size, inspection cycle, and AQL standards need precise definition and consideration. Enhancing radio station inspections requires a policy-driven approach that factors in socio-economic impacts and solicits feedback from industry participants. Future study should also explore various perspectives related to legislative, institutional, and operational aspects of inspection organizations.

• Journal of the Korea Institute of Building Construction
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• 제24권3호
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• pp.319-329
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• 2024

This study examined domestic and international regulations concerning concrete unit weight, along with an evaluation of unit weight in concrete poured on construction sites. Fluctuations in unit weight were observed to correlate with concrete quality issues such as material separation, bleeding, and latency. A word cloud analysis, centered on the concept of concrete quality, further highlighted the significant influence of unit weight. Comparative analysis between Korea and Japan revealed few substantial differences in unit weight management and measurement techniques. However, calculation of concrete unit weight at delivery, using the unit volume mass method, indicated considerable variability among random on-site samples. Notably, the unit weight often exceeded the recommended standard. These findings emphasize the necessity for strict adherence to unit weight standards by all stakeholders involved in concrete production and construction, including ready-mix concrete (REMICON) producers, construction firms, and inspectors. To ensure consistent quality of cast concrete on-site, the establishment of a more comprehensive and practical system is recommended, incorporating measures such as on-site inspections.

• Journal of Advanced Navigation Technology
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• 제28권4호
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• pp.544-551
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• 2024

In this study, the electrochemical polarization data required for the simulation of the plating process, simulation of plating conditions, and characterization of the plating layer were discussed. The electrochemical polarization data obtained by potentiodynamic polarization tests and potentiostat analysis of Ni and Cu were used to observe changes in the overvoltage distribution with the flow conditions of the plating solution. In the simulation of plating conditions, the current density distribution and plating thickness distribution were evaluated under different variables to analyze the influence of the location and number of contacts on the rack pins on the plating quality. Simulation results under variables such as anode geometry, interpole distance, auxiliary anode placement, and variation of substrate spacing were used to explore ways to improve plating thickness deviation. Additionally, plating layer characterization analyzed the thickness, adhesion, and delamination of the plating layer with and without buffer layer formation. The simulation results can be utilized as important basic data for improving the efficiency and quality of the plating process.

• Journal of Internet of Things and Convergence
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• 제10권3호
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• pp.25-33
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• 2024

In tomographic image reconstruction, the focus is on developing CT image reconstruction methods that can maintain high image quality while reducing patient radiation exposure. Typically, statistical image reconstruction methods have the ability to generate high-quality and accurate images while significantly reducing patient radiation exposure. However, in cases like CT image reconstruction, which involve multi-dimensional parameter estimation, the degree of the Hessian matrix of the penalty function is very large, making it impossible to calculate. To solve this problem, the author proposed the PEMG-1 algorithm. However, the PEMG-1 algorithm has issues with the convergence speed, which is typical of statistical image reconstruction methods, and increasing the penalty log-likelihood. In this study, we propose a reconstruction algorithm that ensures fast convergence speed and monotonic increase in likelihood. The basic structure of this algorithm involves sequentially updating groups of pixels instead of updating all parameters simultaneously with each iteration.

• Journal of Energy Engineering
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• 제25권1호
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• pp.131-144
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• 2016

Damage occur frequently around the world on climate change and the main cause of greenhouse gas emissions regulation is growing. To this end, the government has built integrated management system for national building energy. The building energy information is total 6.8 million complex. Integrated management system for national building energy database are matched building registers information and energy information of the supply agencies. However, the matching process has its limitations so advanced work is in progress continuously. This study analyzed integrated management system for national building energy database quality and limitations and deduce improvement plan to increase system reliability and availability. The existing database matching average rate is 85.6%. 58.2% of the total non-matching data type has no building information. To ensure the ease of new database matching and the accuracy of the existing database matching, address standarization and building properties system are needed between building information and energy information. Also, The system construction is required to include information on other energy sources like petroleum energy which has high proportion of non-urban areas and small residential areas and renewable energy which has high potential in development and utilization.