• 해양환경안전학회지
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• 제28권2호
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• pp.193-200
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• 2022

본 연구에서는 진해만의 DO 농도 재현을 목표로 LSTM 모형의 최적 매개변수 조건과 예측변수를 선별하기 위한 Case study를 진행하였다. 모형 매개변수 Case study 결과, 가장 적은 Hidden node와 Epoch인 Hidden node=10, Epoch=100에서 가장 낮은 정확도를 보였다. 이는 모형이 과소적합(Underfitting) 상태인 것으로 판단된다. Hidden node=80, Epoch=1200에서 R² 값은 0.99로 가장 높은 정확도를 보였다. 예측변수 Case study 결과, 1개의 환경변수만을 예측변수로 사용한 Step 1에서 수온을 예측변수로 했을 때 저층 DO 농도 재현의 R² 값은 0.81로 가장 높은 정확도를 보였다. 이후 2개의 환경변수를 사용한 Step 2에서는 수온과 SiO₂를 예측변수로 했을 때 R² 값은 0.92로 수온만 사용했을 때보다 정확도가 급격히 증가하였다. 이는 저층 DO 농도와 SiO₂ 농도간의 높은 상관성$({\mid}R{\mid}=0.70)$에 기인한 것으로 판단된다. 상기 결과로부터 진해만의 DO 농도 재현에 적합한 LSTM 모형의 매개변수와 예측변수를 찾을 수 있었다.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2008년도 발표논문집
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• pp.92-95
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• 2008

• 충청수학회지
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• 제26권3호
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• pp.647-656
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• 2013

Taking into account the flexoelectric effects, we consider a gradient flow of Landau-de Gennes energy which generalizes the Oseen-Frank energy. In this article, we discuss existence of weak solutions of the gradient flow in an appropriate function space.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2008년도 발표 논문집 제17권
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• pp.92-95
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• 2008

• 충청수학회지
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• 제32권4호
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• pp.537-544
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• 2019

In this paper, we consider existence of minimizers for the Oseen-Frank energy with applied electric fields with subject to a mixed boundary conditions.

• 한국패류학회:학술대회논문집
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• 한국패류학회 2003년도 추계학술대회
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• pp.28-28
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• 2003

• 충청수학회지
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• 제36권1호
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• pp.25-37
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• 2023

In this paper, we consider the Landau-de Gennes energy functional for liquid crystals confined in a thin cylindrical domain and study defects of molecular directions in the system by applications of external fields.

• 충청수학회지
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• 제23권3호
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• pp.571-588
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• 2010

We introduce the Landau-de Gennes model in order to understand molecular structures in ferroelectric liquid crystals. We investigate equilibrium configurations of the governing energy functional by means of bifurcation analysis. In particular, we obtain periodic solutions of the functional, which is a signature of a rich variety of applications of ferroelectric materials.

• Asian Journal of Atmospheric Environment
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• 제5권4호
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• pp.216-227
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• 2011

A Sea breeze front (SBF) appears clear particularly if there is opposing wind, and the convergence zone along a SBF affects air quality in coastal areas. This study analyzes features of SBF separation in the presence of an opposing flow in the southeastern coastal area of Korea Peninsula. Using a Regional Atmospheric Modeling System (RAMS) numerical simulation and an opposing flow, two types of SBF were observed at Masan coastal area of Korea. In one, the SBF penetrated inland despite of the opposing flow at Jinhae (1100 LST), Wondong (1700 LST), Saenglim (1700 LST), and Miryang (1700 LST). In the other, the SBF remained on the coastline along with Jinhae (1100 LST), Masan (1400 LST), Jinbuk (1400 LST), and Gaecheon (1700 LST), because the inflow of the sea breeze was not sufficient to penetrate inland against the opposing flow. This study shows that SBFs are affected by the formation of an opposing flow, as well as the inflows of a sea breeze and the opposing flow.

• 한국수산과학회지
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• 제42권1호
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• pp.73-77
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• 2009

Feeding habits of released Sebastes inermis obtained in daily and monthly collections from August 2007 to December 2007 in coastal waters off Jam Island in Jinhae Bay, Korea were assessed. A total 151 individuals of S. inermis (6.3-9.7 cm TL) were recaptured during the study period. Initial food intake of released S. inermis occurred within three days of released. Stomach content index increased with time, however, the percentage of stomachs devoid of contents decreased. Sebastes inermis mainly consumed gammarid and caprellid amphipods, gastropods and mysids. Diet also included small quantities of bivalves, shrimps, copepods and ostracods. Amphipods were mainly consumed at all size groups and consumption of gastropods, bivalves and shrimps increased with increasing fish size.