• Journal of Sensor Science and Technology
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• v.21 no.5
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• pp.374-378
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• 2012

Biofouling causes many problem in industrial processes, medical health industries, water utilities and our daily life. So detecting formation of biofilm on the surface of medical appliance, water pipe and industrial utility is highly important to prevent the problem caused by biofouling. In this study, we suggest an electrochemical sensor for detecting biofilm. We fabricated the electrochemical sensor in MEMS process and cultivated two different kinds of Pseudomonas aeruginosa RpoN type and Wild type on the surface of electrochemical sensor. Each group of Pseudomonas aeruginosa was cultivated according to the hours of 2, 4, 6, 8, 12 and 24. Then we investigated changes in degree of biofilm cultivation using cyclic voltammetry. As a result, it was observed that peak of the cyclic voltammetry curve is increased according as the biofilm growth on the surface of electrochemical sensor. Also we can discern between Pseudomonas aeruginosa RpoN type and Wild type.

• Journal of Korea Society of Industrial Information Systems
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• v.1 no.1
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• pp.203-217
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• 1996

This paper is to describe the development of nesting software for the materials cutting plan of footwear manufacturing processes. In shoes cutting process, almost of the materials cutting plan is dependent upon worker's experience. Thus, thepattern nesting by worker's experience for materials cutting is different form the real cutting results and also different form the error size of yield in degree of worker's skill. Recently, a few of domestic shoes' makers make use of oversee's nesting software.But the nesting software unfits for the domestic actual circumstances , and is complex to use , and is expensive , and is not to be interfaced with the auto cutting machine. Therefore , we have developed the economic nesting systems that are easier for novice to use and fit for the domestic circumstances, which can synchronize with the development of the auto cutting machine. The system comprises interrelated modules for materials information, nesting simulation, utility. The architecture of system, the function of each module, and the information processing proceduresof each function are discussed.

• Journal of the Korean Home Economics Association
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• v.41 no.4
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• pp.127-142
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• 2003

A school uniform leads students to good behavior and have them enjoy desirable school life. We analyse the students' view through questionnaire. We asked 544 students questions about the degree of satisfaction on color, design and style of their uniforms. By analyzing the result of the questionnaire, we found the style of the uniform that students preferred. In this study, we suggest some useful information which is necessary to develop new uniform based on utility and creative aesthetic sense. The questionnaire using this research grounded on the questionnaire of the previous study and the subject selected the random samples out of girls' high school student in Deagu·Kyungbuk Area. The result analysis was peformed by SPSS, one of the statistical analysis method.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1996.10a
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• pp.145-155
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• 1996

This paper is to describe the development of nesting software for, the materials cutting plan of footware manufacturing processes. In shoes cutting process, almost of the materials cutting plan is dependent upon worker's experience. Thus the pattern nesting by worker's experience for materials cutting is different form the real cutting results and also different from the error size of yield in degree of worker's skill. Recently, a few of domestic shoes makers use of oversee's nesting software. But the nesting software unfits for the domestic actual circumstances, and is complex to use, and is expensive, and is not to be interfaced with the auto cutting machine. Therefore, we have developed the economic nesting systems that are easier for novice to use and fit for the domestic circumstances , which can syncronize with the development of the auto cutting machine. The system comprises interrelated modules for materials information, nesting simulation, utility . The architecture of system, the functions of each module and the information processing procedures of each function are discussed.

• Journal of the Korean Home Economics Association
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• v.40 no.4
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• pp.105-124
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• 2002

The purpose of this study was to analyze searching value types of Internet consumer information and to identify difference of information characteristics by searching value types. The online survey was conducted by 262 netizens. We used SPSS10.0 package and statistical analysis as follows : factor analysis, cluster analysis, one-way ANOVA, and Duncan's multiple range test. The results were summarized as follows: 1) searching value types of Internet consumer information were classified into 3 types - high benefit/high risk type, middle benefit/middle risk type, high benefit/low risk type. 2)In the degree of significance for information characteristics, consumer recognized accuracy as the most important then comes variability, utility, up-to-dateness, and reliability in that order. 3) high benefit/high risk type among searching value types was evaluated the most affirmative types for Internet consumer information.

• Journal of Electrical Engineering and Technology
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• v.4 no.1
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• pp.49-54
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• 2009

One of the major challenges confronting a multiservice electric utility is the establishment of the right prices for its services. The key objectives of particular pricing schemes are reasonableness of company earnings, economic efficiency, the responsiveness of supply and of the allocation of sources to the desires of consumers, and maintenance of some degree of competition. This paper proposes a value-based pricing mechanism amenable to the current deregulation situation in electricity market allowing service differentiation. The proposed pricing mechanism can be implemented in a nodal auction model, and can also be applied to direct load control.

• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.695-697
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• 1996

Main theme of this paper is to evaluate the degree of risk due to the uncertainly of the future, especially for the long-term integrated resource planning (IRP) in electric utility. The measures of uncertainty for dealing with planning risk in the IRP context include robustness and flexibility of each candidate resource plan. The uncertainty indices are treated as decision criteria, or attributes, same as economic efficiency or reliability criteria in the multi-attribute decision-making (MCDM) procedure of IRP.

• Journal of Radiation Industry
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• v.11 no.3
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• pp.167-171
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• 2017

This study examined the effectiveness degree of a protective apron that is taken not to be exposed to the first ray or scattered rays, for X-ray of thick subject like lateral lumbar, and the results are as follows; First, spatial dose by scattered rays is shielded by 3 mmPb protective apron, 86.8% at a distance of 50 cm, 92.7% at 100 cm, and 95.6% at 200 cm, when minimizing the field size, while 89% at a distance of 50 cm, 92.3% at 100 cm, and 95.2% at 200 cm, when maximizing the field size. Second, 1st exposure dose is shielded by 3 mmPb protective apron, 93.7% at a distance of 50 cm, 94.4% at 100 cm, and 93.6% at 200 cm, when minimizing the field size, while 93.7% at a distance of 50 cm, 93.6% at 100 cm, and 94.2% at 200 cm, when maximizing the field size.

• ETRI Journal
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• v.45 no.5
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• pp.746-757
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• 2023

This study presents a novel safe landing algorithm for urban drone deliveries. The rapid advancement of drone technology has given rise to various delivery services for everyday necessities and emergency relief efforts. However, the reliability of drone delivery technology is still insufficient for application in urban environments. The proposed approach uses the "landing angle control" method to allow the drone to land vertically and a rapidly exploring random tree-based collision avoidance algorithm to generate safe and efficient vertical landing paths for drones while avoiding common urban obstacles like trees, street lights, utility poles, and wires; these methods allow for precise and reliable urban drone delivery. We verified the approach within a Gazebo simulation operated through ROS using a six-degree-of-freedom drone model and sensors with similar specifications to actual models. The performance of the algorithms was tested in various scenarios by comparing it with that of stateof-the-art 3D path planning algorithms.

• Journal of the Korean Chemical Society
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• v.68 no.3
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• pp.146-150
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• 2024

Precise molecular configuration elucidation of poly(3-hexylthiophene) (P3HT) through advanced spectroscopic techniques is pivotal for enhancing P3HT-based photovoltaic device efficiencies since its high charge-carrier mobility is directly correlated to its well-ordered structure. In this study, we examine Raman depolarization ratios of annealed and non-annealed P3HT films to elucidate their intermolecular π-π configurations. Our findings suggest that the backbone of the annealed film possesses stronger π-π conjugation overlaps than that of the non-annealed film owing to the greater depolarization ratio of the annealed film. In addition, the depolarization ratios are also supported by theoretical calculations, where parallel-stacked thiophene structures display a higher depolarization ratio compared with that of twisted-stacked structures, as calculated by the Møller-Plesset perturbation theory. This study highlights the utility of polarized Raman spectroscopy as a versatile tool for assessing the degree of molecular order in highly conjugated polymer films.