• Journal of the Korean Society of Marine Environment & Safety
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• v.10 no.1 s.20
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• pp.61-67
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• 2004

This study described relationships between fluctuation of fishing conditions for common squid and oceanic conditions in the East Sea from 1990 to 1999. Annual catches of common squid have been higher since the late 1980s compared to the period of the late 1970s to the mid-1980s. These catches fluctuations might be related to the effect of regime shifts. Monthly catches of common squid appear the timing of a large catch from September to December and a poor catch from March to May. The monthly catches are also the highest in October and are the lowest in April. Annual stable fishing grounds for coefficient of variation below 1.0 are formed in waters around Guryongpo and Ullung Island Based on optimum water temperature for catch, $16^{\circ}C$, optimum water depth for catch shallow going north. It indicates that the optimum water depth of fishing work different of each area Fishing ground formation and horizontal water temperature appear the minimum $10{\sim}14^{\circ}C$ in April, the maximum $10{\sim}20^{\circ}C$ in October. If seem, that seasonal fluctuation of fishing ground is related to the extension of the Tsushima warm current in the East Sea.

• The Journal of the Convergence on Culture Technology
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• v.5 no.4
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• pp.115-121
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• 2019

The purpose of this study was to examine relation between perception on hospice and attitude toward death to provide baseline data for the development of programs for hospice or death-related education for university students. The survey was performed on 150 students in four universities in B metropolitan city. The data was collected from July 30 to August 13, 2019. Data were analyzed using descriptive analysis, t-test, ANOVA Pearson's correlation coefficient with the SPSS/WIN 26.0 program. The mean of perception on hospice score was 3.06 out of 4, of the attitude toward death, 'neutral acceptance', 'fear of death', 'death avoidance', 'approach acceptance', and 'escape acceptance' had average scores of 5.31, 3.77, 3.56, 3.15, and 3.06, respectively. There were significant differences in perception on hospice according to gender, major, and experience of hospice-related education and in attitude toward death according to gender, major, religion, subjective health status, experience of hospice-related education. The relationship between perception on hospice and neutral acceptance showed a significant positive correlation, and fear of death and death avoidance showed a significant negative correlation. Therefore, we need consider these variables to develop a hospice or death-related education program to enhance university students' attitudes to death and their perception of hospice.

• The Journal of the Acoustical Society of Korea
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• v.12 no.1
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• pp.37-46
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• 1993

The adaptive algorithm for the Volterra filter is considered. Owing to its simplicity, the LMS algorithm for adaptive Volterra filter(AVF) is widely used as in linear adaptive filters. However, the convergence speed is unsatisfactory. For improving the convergence speed, the frequency domain LMS second order adaptive Volterra filter(FLMS-AVF) is proposed and analyzed. We show that the time and frequency domain LMS AVF's have the same steady state performance under approprate conditons. Moreover, it can be shown that this algorithm can improve the convergence speed significantly by applying self-orthogonalizing method.

• Proceedings of the SAREK Conference
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• 2005.06a
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• pp.189-189
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• 2005

• Transactions of the Korean Society of Mechanical Engineers
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• v.14 no.4
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• pp.1033-1041
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• 1990

본 연구에서는 금속의 응고과정에 수반되는 고체와 액체의 밀도차에 의한 체 적수축을 고려하여 원봉내에서의 일방향 응고과정에 대한 수치해석을 하였다. 상변 화면에서 체적수축에 의한 중력방향으로의 액상 전체운동(bulk motion)과 원봉의 인출 속도 및 주형벽면에서의 경계조건이 금속내부의 온도분포와 상경계면의 이동속도에 미 치는 영향에 대해 연구하였다.

• 월간 기계설비
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• s.64
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• pp.69-75
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• 1995

일본의 근대수도는 100년을 넘는 역사를 갖고 있으며 보급률은 95$\%$에 달하고 대부분의 국민이 수도에 의존하여 건강하고 위생적인 생활을 이루는 기반시설로서 정착하고 있다. 그러나, 건축후 25년을 경과한 맨션 100만동 이상의 거주자가 급수$\cdot$급탕의 적수$\cdot$청수$\cdot$부식누수의 피해에 고민하고 있다. 전번 NHK의 프라임 10에서 $\ulcorner$고치려고 해도 고쳐지지 않는 고령화 맨션의 우울 $\lrcorner$이라고 하는 제목으로서 맨션배관정비개수비 4억엔으로 고민하는 거주자의 곤혹의 실태가 영상으로 호소되었다. 매년 150만호가 건축되는 주택의 급수급탕배관의 대부분이 라이닝강관과 테이퍼 나사 조인트 분기공법으로 시공되고 있다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.409-410
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• 2001

태평양 해 역은 1985∼1997년간 우리나라 연승어업에 의한 다랑어류 평균 어획량의 55％를 차지하는 중요한 해역으로 눈다랑어와 황다랑어가 전체 어획량의 82.2％ 차지 하고 있다. 따라서 다랑어 연승어업의 중요 어장인 태평양 해역에 대하여 서부∼동부 해역의 적도 주변에서 한국 다랑어 연승어업에 의해 주로 어획되는 황다랑어와 눈다랑어를 대상으로 풍도 변동, 연직분포, 어획 적수온, 수온 변동에 따른 분포 특성 등을 밝혀 동 해역에서 조업하는 다랑어 연승어업의 과학적인 어장 정보 제공과 다랑어류 자원의 효율적 이용 및 관리에 기여하고자 한다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.444-445
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• 2001

서해는 수심이 얕은 천해로 대기 및 담수유입의 영향을 많이 받아 온도, 염분, 영양염 등의 환경변화가 계절적으로 매우 큰 지역이다. 우리나라 서해 연안에 서식하는 많은 어류들은 적수온을 따라 이동하여 종조성 빛 양적 변동이 계절에 따라 크게 변화하는 것으로 보고되고 있다(Lee ＆ Seok, 1984; Lee, 1989; Lee ＆ Kim, 1992; Lee ＆ Hwang, 1995; Lee, 1996). (중략)

• Journal of Korean Society of Water and Wastewater
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• v.19 no.1
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• pp.68-77
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• 2005

This study was performed to evaluate the application of corrosion inhibitor and to examine the correlation between corrosion rate and red water in a series of batch tests and a test using auto corrosion monitoring system at A water treatment plant in Gyeonggido. The corrosion study in the auto corrosion monitoring system indicated that Fe concentration decreased by 30~50% and corrosion rate also reduced remarkably with corrosion inhibitor at $1.8mg\;PO_4/L$. After addition of corrosion inhibitor, it was indicated the effective adsorption of the inhibitor on the surface of the pipe line forming a protective film. The corrosion rate increases with the increase in Fe concentration. With $1.8mg\;PO_4/L$ of corrosion inhibitor, the corrosion rate decreased remarkably. Fe concentration had correlation to not only red water problems but also the corrosion rate that actually dissolved into the water, primarily due to the deposition of oxidized iron or other compounds as a scale, which serves as a large reservoir of corrosion by-product. Therefore, corrosion rate can be estimated by Fe concentration. For these reasons, an effective corrosion inhibitor is also an effective red water control reagent. The effect of the corrosion inhibition can last for some time even the application the corrosion inhibitor is discontinued. For the cost effective and efficient corrosion control, the concentration and timing of corrosion inhibitor addition must be determined properly.

• Korean Journal of Food Science and Technology
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• v.29 no.3
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• pp.460-463
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• 1997

One of the major problems in automation of soybean sprouter is watering method. This study was conducted solve this problem. The soybean sprouter consisted of three parts: water-receiving chamber with siphon, water spraying bowl and sprout cultivating bowl. It functions as automatic-watering without manpower and electric power, and is not noisy and has duration. Watering interval, watering time and amount could be controlled by regulation of dropping times/min from a tap. Chlorine contained in tap water is naturally decreased during its (water) storage in the water receiving chamber. Among three types of sprouter (siphon type, wet paper type and water pump type) the siphon type can be used at $25{\sim}30^{\circ}C$ that is the optimum temperature for soybean sprout.