• The KIPS Transactions:PartD
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• v.16D no.4
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• pp.621-630
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• 2009

In recent years, there have been many attempts to connect the latest RFID (Radio Frequency Identification) technology with EIS (Enterprise Information System) and utilize them. However, in most cases the focus is only on the simultaneous multiple reading capability of the RFID technology neglecting the management of massive data created from the reader. As a result, it is difficult to obtain time-related information such as flow prediction and analysis in process control. In this paper, we suggest a new method called 'procedure tree', an enhanced and complementary version of PathTree which is one of RFID data mining techniques, to manage massive RFID data sets effectively and to perform a real-time process control efficiently. We will evaluate efficiency of the proposed system after applying real-time process management system connected with the RFID-based EIS. Through the suggested method, we are able to perform such tasks as prediction or tracking of process flow for real-time process control and inventory management efficiently which the existing RFID-based production system could not have done.

• The Journal of the Korea Contents Association
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• v.21 no.12
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• pp.879-887
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• 2021

This study was carried out for elucidating bioacive properties of three domestic tomato cultivars. Total polyphenol and flavonoid of Rafito, Momotaro and Medison were 10.44±1.84, 11.14±1.95, 12.26±1.82 and 3.62±0.57, 3.24±0.35, 3.87±0.60 mg/g(dry weight) respectively. Domestic tomatoes showed DPPH and ABTS radical scavenging activities. All of tomatoes had no cytotoxicity for normal liver cell, but showed remarkable growth inhibitory effect against cervical cancer cell and liver cancer cell. These results suggested that domestic tomatoes can be used as a bioactive food material.

• Journal of Advanced Navigation Technology
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• v.23 no.4
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• pp.273-280
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• 2019

There are many studies that use structure health monitoring to reduce maintenance costs for aircraft and to increase aircraft utilization. Many studies on FBG sensors are also being conducted. However, if the FBG sensor is installed inside the composite, voids will occur between the layers of the composite, resulting in signal split problem. In addition, the FBG sensor is not affected by electromagnetic waves, but will produce electromagnetic noise caused by electronic equipment during post-processing. In this paper, to reduce the error caused by these noises, the stationary wavelet transform, which has the characteristics of movement immutability and is efficient in nonlinear signal analysis, is presented. And in the above situation, we found that noise rejection performance of stationary wavelet transform was better compared with the wavelet packet transform.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.35 no.1
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• pp.55-62
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• 2019

Hayakawa Kunihiko introduced community space as an open space in Housing in Japan for the first time. We can find the continuity of his architectural intent from his three works (Atrium, Steps, Labyrinth) during the early period of his Housing buildings, In particular, from Labyrinth, his intent was expanded to cities through 'Urban Void', seeking communication and harmony. Accordingly, based on the architectural overview and a field survey of Labyrinth, an analysis was conducted using Space Syntax to investigate whether the space of an inner courtyard is being used as a community space for neighbors who pass through the courtyard and whether the courtyard plays the role of 'Urban Void' as intended by the architect. For this investigation, according to VGA, the courtyard showed the role of great visual connectivity and integration and facilitated connections to the center of the entire space. On the other hand, according to J-Graph, the access stairway connected to each household from the courtyard helped secure privacy in the midst of common space. Step Depth noted that a hierarchy of space was formed to ensure visual privacy within each unit household in addition to privacy for each household.

• Journal of Advanced Navigation Technology
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• v.24 no.6
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• pp.465-470
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• 2020

Complex materials are widely used in aviation industries where lightweighting is essential because they have lighter properties than metals. However, composite materials can cause defects such as internal void formation, poor adhesive mixing, and non-adhesive parts during the production process, and there is a risk of micro-cracking and interlayer separation due to low energy impact. Therefore, a structural damage test is essential. As a result, structural integrity monitoring using FBG is drawing attention. Compared to conventional electrical sensors, FBG has the advantage of being more corrosion-resistant and multiplexed without being affected by electrical noise. However, interloggers measuring FBG are expensive and have a large disadvantage because they are made on the premise of measuring large structures. In this paper, low-cost interloggers were designed for use in unmanned or small aircraft using optical switche, WDM filter, and LTFs, and compared to conventional high-priced interrogator.

• Composites Research
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• v.36 no.6
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• pp.388-394
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• 2023

In composites manufacturing, increasing resin impregnation is a key way to speed up the manufacturing process and improve product quality. While resin improvement is important, simple fiber surface treatments can also improve resin flowability. In this study, different plasma treatment times were applied to carbon fiber fabrics to improve the impregnation between resin and fiber. Electrical resistivity measurements were used to evaluate the dispersion of resin in the fibers, which changed with plasma treatment. The effect of fiber surface treatment on resin spreadability could be observed in real time. When inserting a carbon fiber tow into the resin, the amount of resin that soaked into the tow was measured to objectively compare resin impregnation. Five minutes of plasma treatment improved the tensile and compressive strength of the composite by more than 50%, while reducing the void content and increasing the fire point impregnation flow rate. Finally, a dynamic flexural fatigue test was conducted using a portion of the composite used as an architectural composite part, and the composite part did not fail after one million cycles of a 3 kN load.

• Journal of the Korean Society of Food Science and Nutrition
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• v.36 no.11
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• pp.1358-1364
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• 2007

Response surface methodology was employed to investigate the change of flavonoids components of citrus peel hydrolysate using Viscozyme L as the enzyme. As citrus peels were hydrolyzed by the enzyme, hesperetin and naringenin contents of flavonoids aglycone form increased. The optimal enzyme treatment conditions which were superimposed of the maximized levels for soluble solid, hesperetin, and naringenin contents were enzyme concentration of 1.5% and reaction time of 18 hr. In enzyme-untreated citrus peels (CC), soluble solid content was 48.49% and the content of hesperidin only detected flavonoids was 58.85 mg/g. In the case of optimal enzyme-treated citrus peels (CE), soluble solid content was 72.97% and the contents of naringin, hesperidin, naringenin and hesperetin were 1.56 mg/g, 31.31 mg/g, 2.58 mg/g and 3.90 mg/g, respectively. In the results of electron donating ability and angiotensin converting enzyme inhibition activity, the activity of CE was higher than that of CC.

• Journal of Applied Biological Chemistry
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• v.53 no.2
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• pp.91-98
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• 2010

This study was aimed to investigate the contents of flavonoids and the biological activity of fermented beverage of medical plants, DeulBit (DB). 50 g of Cassia semen (Cassia tora L.), 50 g of Omija (Schisandra chinensis Baillon.), 50 g of Gugija (Lycium chinense Mill), 50g of Menthae herba, 75 g of Chrysanthemum indicum Linne, 25 g of Dioscorea batatas, 5 g of Lindera obtusiloba Blume, 150 g of Polygonatum odoratum, 25 g of Glycyrrhiza uralensis, 25 g of Acanthopanacis cortex, 100 g of green tea (Camellia sinensis), and 100 g of Laminaria japonica was fermented with sucrose ($50.0{\sim}60.0^{\circ}Brix$.) and 0.5% of deep sea water in 10 L of distilled water for six months at room temperature. Total flavonoids contents of DB was calculated to $3.4{\pm}0.5\;{\mu}g/g$ and antioxidative activity of DB was measured by using DPPH radical scavenging and SOD-like activity. DPPH radical scavenging and SOD-like activity of DB was 96% and 29% at 100% of DB, respectively. In addition, DB indicated about 88% and 66% of the xanthine oxidase and angiotensin converting enzyme inhibitory activities at 1% and 10% of DB, respectively and showed fibrinolytic activity. Nitric oxide (NO) synthesis was increased to 15 times by addition of DB. In addition, NO productions of the macrophages RAW264.7 cells stimulated with lipopolysaccharide (LPS) were reduced to 40.4% by addition of DB. These results suggested that DB is significant role for antioxidative and fibrinolytic activity, and have the strong xanthine oxidase and angiotensin converting enzyme inhibitory activities.

• Korean Chemical Engineering Research
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• v.47 no.6
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• pp.715-719
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• 2009

The phase change electrode board for the bio-information detection through electrical property response of phase change material was developed in this study. We manufactured the electrode board using Aluminum first that is widely used in conventional semiconductor device process. Without further treatment, these aluminum electrodes tend to contain voids in PETEOS(plasma enhanced tetraethyoxysilane) material that are easily detected by cross-sectional SEM(Scanning Electron Microscope). The voids can be easily attacked and transformed into holes in between PETEOS and electrodes after etch back and washing process. In order to resolve this issue of Al electrode board, we developed a electrode board manufacturing method using low resistivity TiN, which has advantages in terms of the step-coverage of phase change($Ge_2Sb_2Te_5$, GST) thin film as well as thermodynamic stability, without etch back and washing process. This TiN material serves as the top and bottom electrode in PRAM(Phase-change Random Access Memory). The good connection between the TiN electrode and GST thin film was confirmed by observing the cross-section of TiN electrode board using SEM. The resistances of amorphous and crystalline GST thin film on TiN electrodes were also measured, and 1000 times difference between the amorphous and crystalline resistance of GST thin film was obtained, which is well enough for the signal detection.

• Journal of the Microelectronics and Packaging Society
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• v.22 no.2
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• pp.47-53
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• 2015

The effects of electroless nickel immersion gold (ENIG) and organic solderability preservative (OSP) surface finishes on the in-situ intermetallics reaction and the electromigration (EM) reliability of Sn-3.0Ag-0.5Cu (SAC305) solder bump were systematically investigated. After as-bonded, $(Cu,Ni)_6Sn_5$ intermetallic compound (IMC) was formed at the interface of the ENIG surface finish at solder top side, while at the OSP surface finish at solder bottom side,$ Cu_6Sn_5$ and $Cu_3Sn$ IMCs were formed. Mean time to failure on SAC305 solder bump at $130^{\circ}C$ with a current density of $5.0{\times}10^3A/cm^2$ was 78.7 hrs. EM open failure was observed at bottom OSP surface finish by fast consumption of Cu atoms when electrons flow from bottom Cu substrate to solder. In-situ scanning electron microscope analysis showed that IMC growth rate of ENIG surface finish was much lower than that of the OSP surface finish. Therefore, EM reliability of ENIG surface finish was higher than that of OSP surface finish due to its superior barrier stability to IMC reaction.