• 한국콘텐츠학회논문지
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• 제22권4호
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• pp.433-444
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• 2022

이 연구의 목적은 한국여성가족패널조사 1차부터 7차까지의 균형패널자료를 이용하여 한국여성의 가족가치관, 우울의 변화 궤적과 군집, 그리고 우울의 영향요인을 확인하는 것이다. 본 연구의 대상은 한국여성가족패널에 참여한 여성 패널 5,048명이며, Python의 통계분석패키지 및 LSTM 분석 기법을 활용하여 한국여성의 우울군집을 나누었다. 또한 SPSS 23.0을 활용하여 기술통계 분석, ANOVA, 다항 로지스틱회귀 분석, 위계적 회귀분석을 실시하였다. 연구결과, 여성의 연령이 증가할수록 우울수준이 증가하였으며, 가족가치관은 여성의 우울에 유의한 영향력이 있음을 확인하였다. 기혼집단의 여성의 결혼가치관이 개방적일수록 우울감이 높은 것으로 나타났다. 한국 여성의 우울, 가족가치관궤적의 군집별 사회 인구학적 요인은 상이하게 나타났으며, 가족가치관궤적과 우울수준은 단일 양상이 아니라 네 개의 상이한 군집이 존재하는 것으로 나타났다. 앞으로, 한국여성의 우울을 예방하고 이에 대한 개입 방안을 보다 구체화되기 위해서는 개인별 특성과 가족가치관을 고려한 집단별 지원체계가 마련되어야 할 것이다.

• 천문학논총
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• 제28권3호
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• pp.83-93
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• 2013

NGC 6871을 중심으로 한 Cyg OB3 성협 영역에 대한 변광성 탐사로부터 Paper I에 이어 27개의 식쌍성과 19개의 장주기형 불규칙 변광성을 찾았다. 이 중에서 5개를 제외한 나머지는 모두 새로 발견한 것이다. 27개의 식쌍성 중에서 20개는 주기와 변광진폭 등을 구하였으며, 나머지 7개는 모두 EA형 식쌍성으로 보이지만 관측자료의 부족으로 주기를 결정하지는 못하였다. 주기를 구한 20개의 식쌍성 중에서 주극소의 깊이를 확실하게 구하지 못한 V27를 제외한 V와 B등급의 변광진폭비 $A_V/A_B$가 0.88로서 Paper I의 ${\delta}$ Scuti형 변광성의 결과를 이용한 0.72와 뚜렷이 구분된다. EW형 식쌍성 만을 이용할 경우 변광진폭비는 0.92로 더 뚜렷이 구분되었다. 19개의 장주기형 불규칙 변광성은 주기가 너무 길고, 또한 비주기성 변광성으로 보이므로 주기를 얻지는 못하고, 밝기 변화만 알 수 있었다. 이 연구에서 찾은 변광성은 V등급이 9.05등급부터 16.47등급까지 분포하며, 변광진폭이 클 경우 16.5등급까지도 변광 여부를 확인할 수 있었다.

• 한국약용작물학회지
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• 제25권2호
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• pp.83-88
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• 2017

Background: This study was aimed to determine the optimal vine induction method for growing of Korean schisandra (Schisandra chinensis), by comparing plant growth and fruit yields between plants grown with either fence-type (U-type) or A-type induction. Methods and Results: Plants were transplanted on August 17, 2014, and the plant height, stem node number and weight were measured every two weeks, six times from June 17, 2016. The plant height, stem node number, and leaf length and width were higher with the A-type than with the U-type induction, by approximately 37.0%, 49.1%, 27.6%, and 12.7%, respectively. Although there was no significant difference between the photosynthesis rates of plants grown with the two vine induction method, the leaf area and leaf number per plant were higher in the plants grown with the A-type than the U-type, by approximately 23.7% and 46.0%, respectively. The number of green-color pixels, in a defined area of digital camera images of creeper leaves from the inducted vines, was significantly higher in the plants grown with the A-type than the U-type. The number of fruit clusters per plant was approximately 26 and 36, under the U-type and A-type, respectively. A two fold higher total fruit weight per plant was observed in the plants grown under the A-type (250 g/plant) than the U-type (120 g/plant). Conclusions: The A-type vine induction method is optimal for cultivation of Korean schisandra.

• 천문학회지
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• 제48권6호
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• pp.343-355
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• 2015

There is much observational evidence that active star formation is taking place in the Hii regions Sh 2-255 – 257. We present a photometric study of this star forming region (SFR) using imaging data obtained in passbands from the optical to the mid-infrared, in order to study the star formation process. A total of 218 members were identified using various selection criteria based on their observational properties. The SFR is reddened by at least E(B −V ) = 0.8 mag, and the reddening law toward the region is normal (R_V = 3.1). From the zero-age main sequence fitting method it is confirmed that the SFR is 2.1 ± 0.3 kpc from the Sun. The median age of the identified members is estimated to be about 1.3 Myr from a comparison of the Hertzsprung-Russell diagram (HRD) with stellar evolutionary models. The initial mass function (IMF) is derived from the HRD and the near-infrared (J, J −H) color-magnitude diagram. The slope of the IMF is about Γ = −1.6 ± 0.1, which is slightly steeper than that of the Salpeter/Kroupa IMF. It implies that low-mass star formation is dominant in the SFR. The sum of the masses of all the identified members provides the lower limit of the cluster mass (169M_⊙). We also analyzed the spectral energy distribution (SED) of pre-main sequence stars using the SED fitting tool of Robitaille et al., and confirm that there is a significant discrepancy between stellar mass and age obtained from two different methods based on the SED fitting tool and the HRD.

• 한국농공학회논문집
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• 제62권6호
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• pp.21-31
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• 2020

This study analyzed the spatio-temporal change pattern of greenhouse areas for Sangnam-myeon and Samrangjin-eup of Miryang-si in Gyeongnam, which is one of major greenhouse area. First, in order to overcome the lack of statistical data of the distribution of greenhouses, aerial and satellite images were interpreted from 1987 to 2018, and the spatial distribution of the greenhouse parcels which has continuously increased was mapped based on the digital cadastral map. Next, through the emerging hot spot tool in ArcGIS Desktop, the spatio-temporal change in transition from open-field to greenhouse cultivation was classified into 9 clusters. About 67.7% of the target area was categorized as a hot spot, and the pattern of New hot spot, which were recently converted to greenhouse parcels, covered about 34.1%. While, about 11.3% of parcels were expected to keep the existing open-field cultivation practice for a while. Overall, the greenhouse parcels have been densely developed along a river and were lately expanding even to the far neighbor. It implied that, in the future, the competition of water intake among farms would be more serious and the environmental responsibility in consideration of water quality as well as quantity would be getting strengthened due to increasing pollution loads and river intake.

• Current Photovoltaic Research
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• 제9권3호
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• pp.84-95
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• 2021

The power conversion efficiency of Cu₂ZnSnSe₄ (CZTSe) solar cells depends on the absorber layer thickness; however, changes in the characteristics of the cells with varying absorber layer thickness are unclear. In this study, we investigated the changes in the characteristics of CZTSe solar cells for varying absorber layer thickness. Five absorber thicknesses were employed: CZTSe1 2.78 ㎛, CZTSe2 1.01 ㎛, CZTSe3 0.55 ㎛, CZTSe4 0.29 ㎛, and CZTSe5 0.15-0.23 ㎛. The efficiency of the CZTSe solar cells decreased as the absorber thickness decreased, resulting in power conversion efficiencies of 10.45% (CZTSe1), 8.67% (CZTSe2), 7.14% (CZTSe3), 3.44% (CZTSe4), and 1.54% (CZTSe5). As the thickness of the CZTSe absorber layer decreased, the electron-hole recombination at the grain boundaries and the absorber-back-contact interface increased. This caused an increase in the current loss, owing to light loss in the long-wavelength region. In addition, as the thickness of the CZTSe absorber layer decreased, more ZnSe was produced, and the resulting defects and defect clusters led to an open-circuit voltage loss.

• 정보관리학회지
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• 제37권2호
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• pp.285-310
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• 2020

본 논문은 고에너지 물리학(HEP) 분야 국내 연구자들의 학술 커뮤니케이션의 특성을 파악하고자 성공적인 오픈액세스 모델로 평가되는 SCOAP3 학술지를 분석하였다. HEP 분야 국내 연구자들의 협업과 연구 활동 내용을 파악하기 위한 연구방법으로 통계를 활용한 양적 분석과 저자 소속기관과 학술지에 대한 네트워크 분석을 수행하였다. 연구 결과, 국내 연구자가 참여한 10종의 SCOAP3 학술지 가운데 국내 저자 참여 논문 비율은 전체 논문 가운데 8.0%였다. 논문 한 편당 공저자 수가 천명이 넘는 논문 비율이 전체 논문의 28.7%나 되었다. 이 분석 결과들은 HEP 글로벌 네트워크에서 국내 연구자들이 적극적으로 협업하고 있다는 것을 증명하였다. 소속기관을 중심으로 협력 관계를 파악하고자 네트워크 분석을 실시한 결과, 협력 네트워크를 3개의 클러스터로 구분할 수 있었다. 즉 S대학 중심의 클러스터, CERN과 협력 인프라를 제공하는 K연구기관 중심의 클러스터, 그리고 I연구원 중심의 클러스터로 나누어졌다. 연구기관과 학술지의 네트워크 분석을 통하여 학술지 중 JHEP, PRD, PLB가 참여도가 높은 학술지였으며 대학들과 연구원들도 협력하여 오픈 액세스 논문 저작에 참여하고 있음을 알 수 있었다. 본 연구 결과는 SCOAP3 컨소시엄에 참여하는 도서관들이 HEP 분야 연구자를 이해하고 이들을 위한 최적의 연구 정보환경을 구축하기 위한 기초자료로 활용될 수 있다.

• 한국항해항만학회지
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• 제27권3호
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• pp.315-320
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• 2003

Since the beginning of open-door policy, China has been making rapid annual growth with an average 10% economic development. And due to this rapid growth, cargo volumes via ports have been also rapidly increased, and accordingly, current China government has intensively invested in port development. Further, this development project is significantly big scale, compared with those project which Korea and Japan have. Thus, China is beginning to threaten Korean ports, especially Busan port which try to be a hub port in Northeast Asia. For this reason, it has been very important issue for Korea and Busan port to investigate or analyze Chinese ports based on empirical data. Especially, although various studies related to Shanghai and Hong Kong have been conducted, the competitiveness of overall Chinese major ports has been little studied. In this paper, we analyzed competitiveness level of eight Chinese ports with capabilities as container terminal, based on reliable sources. From data analysis, eight Chinese ports were classified into four groups according to competitiveness level. Rankings among four clusters based on competitiveness level are cluster(Hone Kong), cluster C(Shanghai), cluster A(Qingdao, Tianjin, and Yantian) and cluster D(Dalian, Shekou, and Xiamen).

• 한국자기학회지
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• 제19권5호
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• pp.157-160
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• 2009

Ge 원자로 구성된 1차원 체인형태의 나노클러스터에 자성전이금속 Cr 및 Mn 원자를 치환 하였을 때 자성전이금속 원자사이의 자기적 상호작용을 제1원리의 범밀도함수법을 이용하여 계산하였다. 그 결과 Ge 원자와 전이금속 원자는 반강자성적인 상호작용을 하고 있으며, Ge-Ge원자 또한 반강자성 경향을 나타내었다. 이러한 자기 교환상호작용은 Ge 원자 여러 원자 층을 자화시켜 일어나고 있으며, 그 크기도 작지 않았다. 또한 자기 교환상호작용은 Ge 원자 수에 크게 의존하였다.

• 천문학회보
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• 제40권1호
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• pp.52.1-52.1
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• 2015

We have recently installed SQUEAN on the 82 inch telescope at the McDonald Observatory, USA. This instrument consists of an ANDOR CCD camera, a focal reducer, an electronic box, an auto guiding system and a new filter wheel which holds up to 20 filters. Currently the filter wheel is equipped with Johnson-Cousins BVRI filters, SDSS rizY and isiz filters, and 50nm medium band pass filters (M625(625nm), M675(675nm), M725(725nm), M775(775nm), M825(825nm), M875(875nm), M925s(925nm), M975(975nm), and M1025(1025nm)). Our medium band pass filter system is suitable with SED fitting. Filter transformation methods are essential for time-domain observations including transient objects, e.g., supernovae, variable stars, and solar system bodies. In this work, we develop a series of equations to convert the open clusters photometry data within these filter systems.