• Fisheries and Aquatic Sciences
• /
• v.11 no.1
• /
• pp.41-49
• /
• 2008

Internal waves and internal tides occur frequently along the eastern coast of Korea. During the spring-tide period in April 2003, the East Korean Warm Current (EKWC) flowed near the Korean East Coast Farming Forecast System (KECFFS; a moored oceanographic measurement system), creating a strong thermocline at the intermediate layer. Weakened stratification and well-mixed water appeared frequently around the KECFFS, with duration of approximately 1 day. The results suggest the following scenario. Baroclinic motion related to the internal tide generated high frequency internal waves around the thermocline. The breaking of those waves then created turbulence around the thermocline. After well-mixed water appeared, a current component with perpendicular direction to the EKWC appeared within the inertial period. The change in stratification around the KECFFS locally broke the geostrophic balance as a transient state. This local vertical mixing formed an ageostrophic current within the inertial period.

• Proceedings of the KIEE Conference
• /
• 1998.11a
• /
• pp.208-210
• /
• 1998

A high speed digital distance relaying algorithm based on a modified least square error method is proposed. To obtain stable phasor values very Quickly, first, a lowpass filter which has very short transient period and no overshoot is used. Secondly, the conventional least square error method is modified to the one having the data window of 3 samples by applying a FIR filter which removes the DC-offset component in current relaying signals.

• Journal of the Korean Society of Costume
• /
• v.63 no.7
• /
• pp.94-108
• /
• 2013

This study is about the armors that high navy officers of Joseon wore during the period of Japanese invasion of Korea(1592~1598). The kinds of armors that these officers wore during this period are Sueungap, cheolgap, pigap, jigap and myeongap. Sueungap, cheolgap, pigap are all described in literatures, which were released in that period and the early Joseon period. According to publications that were released during that period, Yuyeopgap was a type of an iron armor. Armors that are recorded in only literatures published in the early Joseon period include swaejagap, gyeongbeongap, dujeonggap, hwangdongdujeonggap and dudumigap. Myeongap is found only in publications that were made in the above war time. The styles of armors are largely classified into chalgap and dujeonggap. The chalgap-styled armors used gapchal as their main component. Dujeonggap-styled armors used fabrics and dujeong. The names and the manufacturing methods of the gapchal did not changed since its creation in the early Joseon period until the above wartime. But, their shapes were considerably changed between the two times. This is clearly shown in armors that were found in the moat of the Dongrae-eup fortress. Dujeonggap-styled armors that were used during the period of the Japan-Korea war were a successor to those of dujeonggap-styled armors of the early Joseon period. But the former armors were different from the latter in that they had no gapchal inside. They are well represented by Jeong Chung Sin's armor.

• Korean Journal of Food Science and Technology
• /
• v.21 no.6
• /
• pp.876-883
• /
• 1989

In order to investigate the index component and basis for the shelf-life of the grain share improved Meju, the effect of the storage time and package on the quality of Meju and soy sauce were studied during 90 days storage at $30^{\circ}C$. Also, sensory evaluation for the soy sauces from Meju with various storage time were carried out. During the storage period, moisture content, amylase and protease activity were decreased, on the other hand, the contents of amino-nitrogen and ammonia-nitrogen were increased. Among these components, protease activity was found the major index component for quality control because it was the most important component for soy sauce fermentation and the most changeable component of Meju during the storage period. According to the sensory test, the quality of soy sauce was agreed well with the protease activity of Meju, and the soy sauce from longer storage Meju was inferior organoleptic quality to that from shorter Meju. By the storage quality test, protease activity showed the highest value in 15 days storage Meju and decreased gradually with storage time passed. The basis of protease activity for quality control was 200 (O.D. at 660 nm/g). which was 50% of the initial activity And it was known that the shelf-life of the grain shape improved Meju was about 90 days . It was also shown that the storage in package did not affect noticeably to prolong the shelf-life of Meju on this study.

• International Journal of Reliability and Applications
• /
• v.15 no.1
• /
• pp.51-64
• /
• 2014

This paper develops a warranty cost model for complex systems with imperfect repair within a warranty period by addressing a practical case that the first inter-failure interval is longer than any other inter-failure intervals. The product is in its best condition before the first failure if repair is imperfect. After the imperfect repair, other inter-failure intervals which are explained by renewal processes, are stochastically smaller than the first inter-failure interval. Based on this idea, we suggest the failure-interval-failure-criterion model. In this model, we consider two random variables, X and Y where X represents failure intervals and Y represents failure criterion. We also obtain the distribution of the number of failures and conduct the warranty cost analysis. We investigate different types of warranty cost models, reliabilities and other measures for various systems including series-parallel configurations. Several numerical examples are discussed to demonstrate the applicability of the methodologies derived in the paper.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.51 no.4
• /
• pp.504-511
• /
• 2015

In this paper, the results of evaluating the passenger comfort due to the standard deviation of acceleration in vertical and lateral direction regarding the ship response in irregular wave by ordinary strip method in regular wave and energy spectrum using linear superposition theory in order to evaluate the motion of experimental ship are as follows. According to the results of ship response, it was possible to find that, in order to reduce the motion of ship, a ship operating in bow sea was more stable than in quartering sea. In the results of analyzing the standard deviation of acceleration in vertical direction according to each component wave pattern, when there was a wave length of 56m and an average wave period of 6 sec, most of cases showed the peak value. And among them, the standard deviation was 0.35 which was the highest in head sea. And in case of lateral direction, the maximum value was shown in a wave length of 100m and an average wave period of 8 sec. And it was 0.16 in beam sea and ${\chi}=150^{\circ}$. In the evaluation of passenger comfort due to standard acceleration in vertical and lateral direction, it was 80% in head and bow sea. On the other hand, it was shown to be 15% in follow sea. Accordingly, when the expected wave height in a sea area where a training ship was intended to operate was known, it was possible to predict the routing of ship. And altering her course could reduce the passenger comfort by approximately 50%.

• Bulletin of the Korean Space Science Society
• /
• 2010.04a
• /
• pp.32.3-32.3
• /
• 2010

We have analyzed times of minima for six eclipsing binary systems which show asymmetric light curves. We found that five binary systems show period decrease and one system shows cyclic period variation. Three asymmetric light curves (SV Cen, RT Scl and VW Boo) are due to hot spot caused by mass transfer. Other three asymmetric light curves (AD Phe,, EZ Hya and TY Boo) are due to cool spot on the cooler component caused by magnetic activities. We also obtain absolute dimensions from photometric solution and spectroscopic solution by analyzing their light curves and radial velocity curves, collected from literatures, using 2007 version Wilson and Devinney computer code.

• Applied Biological Chemistry
• /
• v.14 no.1
• /
• pp.29-34
• /
• 1971

Changes in hot-taste component during the after-ripening period of hot pepper fruit were surveyed and summarized as follows; (1) Capsaicinoid contents were steadily increased as the after-ripening proceeded when physiological activity of the sample was suppressed during each stage of the ripening with the vacuum dry freezing. (2) It was assumed by determining phenylalanine contents and activities of phenylalanine ammonialyase to see synthetical process of capsaicin in the metabolic part of vanillylamine that there is a gradual synthesis and accumulation of capsaicin during the after-ripening period. (3) Lignin-like substances, as in the case of capsaicinoid, showed a steady increase during the after-ripening period. (4) The contents of polyphenolic compounds and polyphenol oxidase activity were higher with low temperature treatment.

• Journal of muscle and joint health
• /
• v.27 no.1
• /
• pp.31-40
• /
• 2020

Purpose: This study was done to examine the effect of a multi-component cessation program on bone union by comparing the union time between the experimental group and the control group. Methods: A non-equivalent control group posttest design was used. The subjects were 33 patients in the experimental group and 33 patients in the control group, 66 patients in total. The subjects of the experimental group were provided with a face-to-face multi-component smoking cessation program. After the discharge, telephone consultation was provided once a week for 10 weeks. Results: Bone union time was 51.6±10.9 days in the experimental group and 60.9±13.83 days in the control group (p=.003). Among 33 subjects who participated in the smoking cessation program, the average union period of the participants who succeeded in quitting smoking was 44.56 days, the participants who reduced smoking were 50.67 days, and failed to quit smoking group was 60.11 days (p=.006). Conclusion: This study indicated the importance of smoking cessation in patients with fracture and the decrease in the union time by providing smoking cessation education. If the multi-component smoking cessation program is used as a nursing intervention in clinical practice, it will be effective for bone union by increasing the smoking cessation rate of patients with fracture.

• Journal of Bio-Environment Control
• /
• v.18 no.2
• /
• pp.142-147
• /
• 2009

The effects of short-term waterlogging on physiological responses, fatty acid compositions and yield components of rapeseed at both the vegetative growth and the reproductive growth stages were assessed in this study. Waterlogged plants were treated for a period of 10 days at the vegetative growth stage and 4 days at the reproductive growth stage. The results show that photosynthesis and stomatal conductance at both the vegetative growth and the reproductive growth stage were significantly reduced during the waterlogging period and after the recovery period. When the plants were removed from water, photosynthesis and stomatal conductance progressively restored similar values to those of control plants within $2{\sim}3$ days. Fatty acid compositions were unaffected by waterlogging treatment. However, yield components (pod number and pod length) of the waterlogged treated plants at the reproductive growth stage were significantly reduced. These results suggest that short-term waterlogging may thus influence oilseed yield component.