• Ocean and Polar Research
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• v.37 no.2
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• pp.161-177
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• 2015

This study analyzes the stock assessment of yellow croaker caught mainly by the Korean stow net and gill net fisheries focusing on single species and multiple fisheries. This study standardizes fishing efforts for the two fisheries using the general linear model and uses a surplus production model based on the exponential growth model. The Clarke Yoshimoto Pooley model estimates a maximum sustainable yield(MSY), an allowable biological catch(ABC), fishing efforts for MSY($E_{MSY}$) and for ABC($E_{ABC}$). The bio-economic model is used to estimate the maximum economic yield(MEY) and fishing efforts for MEY($E_{MSY}$). Also, the study employs an economic analysis to estimate the economic interaction between stow net and gill net fisheries. The economic analysis shows the profit accruing to the two fisheries from estimated ABC. Finally, the study compares TACs based on single species and single fishery to TAC based on single species and multiple fisheries. The study proposes that the TAC assessment is necessary for single species and multiple fisheries in order to preserve resources.

• Korean Journal of Human Ecology
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• v.23 no.4
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• pp.613-631
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• 2014

Personality education activities based on the roots of empathy program were designed and practiced in this study to investigate their effects on young children's empathic ability and emotional intelligence. The subjects of this research were 60 five years old of 2 classes in 'W' kindergarten in 'I' city, Jeonra Buk province. We randomly assigned 30 children of one class to the experimental group and 30 children of the other class to the controlled group. The personality education activities based on the roots of empathy program was by the researcher. The results of this study are summarized as follows. First, the personality education activities based on the roots of empathy program improved children's empathic ability. And that effects are shown in all sub-areas of empathic ability(sorrow/burden/joy/fear). Second, the personality education activities based on the roots of empathy program improved children's emotional intelligence. And that effects are shown in all sub-areas of emotional intelligence(recognition and expression of emotion/promotion of thinking by emotion/application of emotional knowledge/emotional reflective control).

• Journal of the Korean Society of Costume
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• v.51 no.6
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• pp.85-99
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• 2001

본 연구에서는 유니섹스 영 캐주얼웨어의 국내브랜드를 중심으로 고찰한 후 그 디자인 특성에 대해 살펴보고 한 시대의 패션현상을 규명하고자 하는데 그 목적이 있다. 연구방법은 국내 패션시장의 유니섹스 영 캐주얼웨어에 대한 디자인 특성을 살펴보기 위해 신세대의 하위문화와 국내브랜드 시장조사를 통한 유니섹스 영 캐주얼웨어의 동향에 대한 일반적 고찰을 한 후 영 캐주얼웨어의 브랜드를 디자인의 차이에 따라 분류하고, 그 디자인 특성을 컬러, 소재, 스타일, 아이템별로 구분하여 분석하였다. '00 S/S, '00 F/W의 유니섹스 영 캐주얼웨어 브랜드를 중심으로 고찰해 보고자 패션 정보잡지와 인터넷의 패션사이트를 검색하였다. 유니섹스 영 캐주얼웨어의 브랜드별 시장조사를 통한 그 결과는 다음과 같다. 1. 영상매체, 대중음악. 스포츠, 스타문화로 나타난 신세대의 하위문화는 탈중심성, 탈국경화, 의미의 해체 등의 포스트모던적 문화현상이며. 유니섹스 영 캐주얼웨어는 자유와 개성을 추구하는 신세대의 라이프 스타일을 잘 반영한 하위문화의 복식양식으로서 현대 패션에 영향을 미치고 있다. 2. 기성복업체는 신세대가 가지고 있는 새로운 욕구와 감성을 겨냥한 브랜드를 개발하고 판매촉진을 위해 전력을 다하는 과정에서 신세대의 하위문화를 반영한 유니섹스 영 캐주얼웨어의 일반적인 복식양식을 형성하였다. 3. 국내시장의 유니섹스 영 캐주얼웨어는 디자인 특성에 따라 컴포터블 캐주얼웨어, 스포츠 캐주얼웨어, 힙합 캐주얼웨어로 구분된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.317-320
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• 2001

In this paper, we have presented the simulation results about threshold voltage at Si-based MOSFETs with channel length of nano scale. We simulated the Si-based n-channel MOSFETS with sate lengthes from 180 to 30 nm in accordance to constant voltage scaling theory. These MOSFETs had the lightly doped drain(LDD) structure, which is used for the reduction of electric field magnitude and short channel effects at the drain region. The stronger electric field at this region it due to scaling down. We investigated and analysed the threshold voltage of these devices. This analysis will provide insight into some applicable limitations at the ICs and used for basis data at VLSI.

• Annual Conference of KIPS
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• 2016.10a
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• pp.733-734
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• 2016

This study proposes a novel approach for ground segmentation of 3D point cloud. We combine two techniques: gradient threshold segmentation, and mean height evaluation. Acquired 3D point cloud is represented as a graph data structures by exploiting the structure of 2D reference image. The ground parts nearing the position of the sensor are segmented based on gradient threshold technique. For sparse regions, we separate the ground and nonground by using a technique called mean height evaluation. The main contribution of this study is a new ground segmentation algorithm which works well with 3D point clouds from various environments. The processing time is acceptable and it allows the algorithm running in real time.

• Journal of Korea Foundry Society
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• v.34 no.4
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• pp.123-129
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• 2014

This work presents the results of a thixo-extrusion process applied to aluminum alloy and and reheating characteristics of semi-solid A356 Alloy using have been discussed. The reheating experiment was performed using an electric resistance furnace and multi-stage heating for uniform reheating. The thixo-extrusion was performed at the optimal reheating conditions of the semi-solid A356 alloy, the the extrusion conditions were an extrusion ratio of 33 and ram speed of 6 mm/sec. The results showed that the thixo-extrusion of semi-solid A356 alloy fabricated by the cooling slope reduced the extrusion pressure by 180% in comparison with hot extrusion, and that a sound extrusion could be obtained in spite of the same extrusion ratio and strain rate.

• Journal of Korea Foundry Society
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• v.36 no.6
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• pp.195-201
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• 2016

The effects of Mg addition on heat treatment and mechanical properties of A356 alloy were investigated. With increased amounts of Mg addition to A356 alloy, the grain size decreased and eutectic Si was refined. And, this process can improve the mechanical properties. Solid solution heat treatment causes the spheroidizing of eutectic Si. In this study, although eutectic Si was refined with Mg addition, solid solution time increased from 2 hours to 6 hours with Mg addition, and aging time also increased, from 4 hours to 8 hours. After heat treatment, Mg2Si remained in a formation of Chinese script. And, Chinese script Mg2Si formed with Mg addition caused a reduction of the elongation of the alloys according to the stress concentration.

• Ocean and Polar Research
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• v.37 no.4
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• pp.357-368
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• 2015

This study analyzed structural changes and asymmetry of price volatility during the period before and after a point of structural change in price volatility, using the Korean fresh common squid daily retail price data from January 1, 2004 to September 30, 2015. This study utilized the following analytical methods: the unit-root test was applied to ensure the stability of the data, the Quandt-Andrews breakpoint test was applied to find the point of structural change, and the Glosten-Jagannathan-Runkle GARCH and EGARCH models were applied to investigate the asymmetry of price volatility. The empirical results of this study are as follows. First, ADF, PP, KPSS and Zivot-Andrews tests showed that the daily retail price change rate of the Korean fresh common squid differentiated by logarithm was stable. Secondly, the ARIMA (2,1,2) model was selected by information criteria such as AIC, SC, and HQ. Thirdly, the Quandt-Andrews breakpoint test found that a single structural change in price volatility occurred on June 11, 2009. Fourthly, the Glosten-Jagannathan-Runkle GARCH and EGARCH models showed that estimates of coefficients within the models were statistically significant before and after structural change and also that asymmetry as a leverage effect existed before and after structural change.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.10
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• pp.101-108
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• 2001

In this study, the static and dynamic characteristics of endmilling process were modelled and the analytic realization of chatter mechanism was discussed. In this reward, We have discussed on the comparative assessment of recursive time series modeling algorithms that cal represent time machining process and detect the abnormal machining behaviors in precision endmilling operation. In this study, simulation and experimental works were performed to show the malfunctional behaviors. For this purpose, new recursive algorithm(RLSM) was adopted for the oil-line system identification and monitoring of a machining process, we can apply these new algorithms in real process for detection of abnormal chatter. Also, The stability lobe of chatter was analysed by varying parameter of cutting dynamics in regenerative chatter mechanics.

• Journal for History of Mathematics
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• v.25 no.1
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• pp.45-56
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• 2012

Mathematical biology has been recognized its importance recently and widely studied in the fields of mathematics, biology, medical sciences, and immunology. Mathematical ecology is an academic field that studies how populations of biological species change as times flows at specific locations in their habitats. It was the earliest form of the research field of mathematical biology and has been providing its basis. This article deals with various form of interactions between two biological species in a common habitat. Mathematical models of predator-prey type, competitive type, and simbiotic type are investigated.