• Analytical Science and Technology
• /
• v.26 no.6
• /
• pp.381-386
• /
• 2013

The sixty nine chemicals that are closely linked to chemical accident are designated as the substances requiring preparation for accidents and managed for public health under the Toxic Chemicals Control Act. In this study, storage stability of allyl chloride (AC) and carbon disulfide (CD), which are highly inflammable and volatile in tedlar bags, was studied for gaseous chemicals sampling. Storage stability was studied considering storage temperature ($2^{\circ}C$, $25^{\circ}C$), chemical concentration (low conc. ppm, high conc. ppm) and storage time (0, 48, 96, and 144 hr). Also, the stability of bags containing one type of chemical substance and the bags containing a mixture of chemicals was compared against each other. As a result, two chemicals showed decreasing storage stability based on storage time. Also two chemicals presented statistical significance of concentration and mixing type.

• Journal of the Korean Applied Science and Technology
• /
• v.4 no.2
• /
• pp.15-18
• /
• 1987

The storage stability of Instant Ramyon by industrially prepared with palm, beef tallow and blended rapeseed oils for frying oil was studied. The products was stored under fluorescent light at $60^{\circ}C$ with illumination of 9,000 lux. Changes of peroxide value, total carbonyl value, and absorbance at 232 nm of lipids extracted from Ramyon were investigated during storage. The storage stability of Ramyon prepared with oils containing TBHQ had better than that prepared with a mixture of BHA and BHT. The Ramyon prepared with 4 part of rapeseed oil to 6 part of tallow containing 0.02% BHA/BHT showed higher storage stability than that prepared with palm oil alone but showed lower stability than that prepared with tallow alone both under the same condition of antioxidant treatment.

• Transactions of the Society of Information Storage Systems
• /
• v.2 no.1
• /
• pp.65-70
• /
• 2006

In the information storage development, the trend of the storage device is to increase the recording density. Among such an effort, near-field probe recording is spotlighted as a method of high increasing recording density. For the successfully embodiment of storage device, the actuating mechanism of near-field probe is essentially designed. In this paper, we suggest the slider similar with conventional HDD and design the slider using near-field probe for the purpose of applying the slider in order to control gap between probe and media. The most important object of slider design is to guarantee the flying ability and stability. For achievement of these design objects, we perform two step of optimal design process. The media is supposed to model as random displacement, which is only considered roughness of disk surface. The design slider is analyzed with dynamic state in assumed media. At this process, the optimal model is confirmed to stable flying stability.

• 정보저장시스템학회:학술대회논문집
• /
• 2005.10a
• /
• pp.171-176
• /
• 2005

In the information storage development, the trend of the storage device is to increase the recording density. Among such an effort, near-field probe recording is spotlighted as a method of high increasing recording density. For the successfully embodiment of storage device, the actuating mechanism of near-field probe is essentially designed. In this paper, we suggest the slider similar with conventional HDDs and design the slider using near- field probe for the purpose of applying the slider in order to control gap between probe and media. The most important object of slider design is to guarantee the flying ability and stability. For achievement of these design objects, we perform two step of optimal design process. The media is mod! eled as random displacement, which is only considered roughness of disk surface. The design slider is analyzed with dynamic state in assumed media. At this process, the optimal model is confirmed to stable flying stability.

• Transactions of the Society of Information Storage Systems
• /
• v.11 no.2
• /
• pp.31-35
• /
• 2015

The Blu-ray Disc Recordable-Triple Layer (BD-R TL) media is considered as one of strong candidates for archival application among optical media formats, due to its large capacity. However, the long-term stability and degradation aspect have not been fully understood yet for BD-R TL media. Thus, the BD-R TL media were recorded at full tracks and analyzed by the random-symbol error rate (R-SER) measurement at different recording layers and recording positions after the accelerated aging test to understand its long-term stability. Finally, the general degradation aspect of BD-R TL media was discussed to improve the long-term stability.

• The Korean Journal of Food And Nutrition
• /
• v.36 no.4
• /
• pp.264-273
• /
• 2023

Physicochemical properties and storage stability of plant-based alternative meat prepared with low-fat soybean powder (LPAM) treated by supercritical-CO₂ and those of full-fat soybean powder (FPAM) were compared. Ash and crude protein contents were higher in LPAM than in FRAM. Water absorption capacity and oil absorption capacity were significantly higher in LPAM than in FPAM. Water binding capacity was higher in LPAM than in FPAM during a 20 days storage period at 5℃ and pH was significantly lower in LPAM than in FPAM after a 5~10 days storage period. Hardness, gumminess and chewiness significantly increased with the increase in the storage period, and the three were significantly higher in LPAM than in FPAM after 10 days and 20 days of storage. The acid value showed no remarkable difference according to the storage period in LPAM; however, it was significantly higher in FPAM than in LPAM after 20 days of storage. The peroxide value and TBA value were significantly increased according to the storage period, and were significantly lower iin LPAM than in FPAM during all the storage periods. Therefore, the use of low-fat soybean powder may be effective in improving oxidative stability during storage in the production of plant-based alternative meat.

• Journal of Electrical Engineering and Technology
• /
• v.6 no.4
• /
• pp.447-458
• /
• 2011

In this paper, a novel flywheel energy storage device, called the flexible power conditioner, which integrates both the characteristics of the flywheel energy storage and the doubly-fed induction machine, is proposed to improve power system stability. A prototype is developed and its principle, composition, and design are described in detail. The control system is investigated and the operating characteristics are analyzed. The test results based on the prototype are presented and evaluated. The test results illustrate that the prototype meets the design requirement on power regulation and starting, and provides a cost-effective and effective means to improve power system stability.

• Journal of Pharmaceutical Investigation
• /
• v.40 no.3
• /
• pp.187-192
• /
• 2010

We aimed to evaluate the effect of temperature, pH, and light conditions on the stability of porcine placental extract (PPE)-loaded liposomes with different surface charges. The size distribution profiles and in vitro release patterns were investigated by dynamic light scattering method and spectrophotometry. The stability of PPE-loaded liposomes was affected by the surface charges of the liposomes. As compared to neutral and anionic liposomes, cationic liposome formulations showed significantly lower physical stability. At the test storage conditions of different temperatures and pHs, the mean sizes of cationic PPE-loaded liposomes substantially increased. In contrast, neutral and anionic liposomes did not reveal significant changes in mean sizes upon various storage conditions. The neutral and anionic liposomes showed no significant differences in the release profiles of PPE after storage at various temperatures and pHs. Our results indicate that anionic and neutral liposome compositions might be more suitable for the formulations of PPE providing the higher stability.

• Journal of Korean Society for Atmospheric Environment
• /
• v.15 no.5
• /
• pp.667-676
• /
• 1999

The roles of ceria on three-way catalyst is to improve the noble metal dispersion and thermal stability of support ${\gamma}$-$Al_2O_3$. And, ceria has a oxygen storage capacity(OSC) under fuel rich/lean conditions to improve the operating windows of NOx, THC and CO conversion. However, ceria has weak thermal stability under high temperature due to the crystallite growth. So that, the OSC of ceria is decreased, and then the conversions of NOx, THC and CO is decreased. One way of enhancing the thermal stability and NOx, THC and CO conversion Pd-only catalyst is to improve as well as its thermal stability and oxygen storage capacity of the ceria. Especially, the appropriate mixing ratios of bulk and stabilized ceria are very important for designing principles of Pd-only three-way catalysts. In this paper, we discussed the thermal properties of stabilizedand unstabilized (bulk) ceria, and the oxygen storage capacity (OSC) of catalysts, and found the correlation between activity and the OSC of Pd-only catalysts with various different mixing ratios of bulk and stabilized ceria. Finally, we propose the design principles to improve the thermal stability of washcoated Pd-only catalysts.

• Food Science and Biotechnology
• /
• v.17 no.4
• /
• pp.809-813
• /
• 2008

The objective of this study was to determine storage stability and antioxidant effect of T1, ascorbic acid (0.6%); T2, ethanol extracts of Bacillus polyfermenticus (5%); T3, mixture with ascorbic acid (0.3%), and ethanol extracts of B. polyfermenticus (2.5%) during the storage period. The pH of sausage decreased constantly during storage (p<0.05). Thiobarbituric acid reaction substance (TBA) values were lower in all treated samples compared to the control (p<0.05). Longer storage periods resulted in higher TBA values (p<0.05). Volatile basic nitrogen (VBN) value in T1, T2, and T3 were significantly lower than control (p<0.05). The $L^*$ value of T1, T2, and T3 had higher than control. The $a^*$ value of T2 was significantly lower than control, T1, and T3 during storage period (p<0.05). The $b^*$ value of T2 had significantly higher compared to the other sausage samples during storage period (p<0.05). Total microbial counts in the sausages samples significantly increased as storage period increased (p<0.05). Further studies are needed to develop various meat products to extend the storage stability using B. polyfermenticus SCD.