• 한국보육지원학회지
• /
• 제17권1호
• /
• pp.125-150
• /
• 2021

Objective: The purpose of this study is to explore the parental role that men experience during parental leave. From the moment when a man decides to take parental leave, to his experiences during parental leave, and to the father's role that lasts until after reinstatement, this course will be examined. Methods: The subjects of this study were five fathers who were taking parental leave. Data were collected through semi-structured interviews done on Zoom, telephone calls and e-mail. Results: The results are as follows. First, the motive for the father's decision to take parental leave was that he wanted to take a break from work and to spend time with his children. Second, the father had experiences of a caregiver and secure-base for his ones. Also, he experienced intergenerational transmission of his parental role. Third, the father's role was maintained even after parental leave. Conclusion/Implications: The decision to take parental leave was a process of conformation of one's own decision. The parental role of the father was experienced through daily life and interaction with his children. And that continued even after parental leave.

• 문화기술의 융합
• /
• 제8권2호
• /
• pp.179-185
• /
• 2022

우리 사회는 정보통신기술 발달로 온라인 가상세계와 현실 세계가 융합하여 새로운 세계가 창조되는 메타버스로 인해 새로운 전환기에 접어들고 있다. 엔터테인먼트 분야에 치중되었던 메타버스의 영역은 친교 활동, 교육, 상거래 등 일상의 영역으로 점차 확대되고 있으며, 전투원에게 실제 전장과 같은 가상훈련 환경을 제공하고, 사격과 기동, 통신, 방호 등 군사분야에서 활용성도 커지고 있다. 따라서 본 연구는 메타버스의 개념과 핵심유형, 발전 동향과 군사분야에서의 활용성에 대해 논하고자 한다.

• 한국염색가공학회지
• /
• 제34권3호
• /
• pp.197-206
• /
• 2022

The purpose of this study was to confirm the optimal spinning conditions for PLA (Polylactic acid) as a fiber forming polymer. According to the melt spinning test results of PLA, the optimal spinning temperature was 258℃. However, it needs to note that relatively high pack pressure was required for spinning at 258℃. At an elevated temperature, 262℃, mono filament was broken easily due to hydrolysis of PLA at a higher temperature. In case of fiber strength, it was confirmed that the draw ratios of 2.7 to 3.3 were optimal for maximum strength of melt spun PLA. Above the draw ratio, 3.3, the strength of the PLA fibers was lowered. It was presumed that cleavage of the PLA polymer chain over maximum elongation. The heat setting temperature of GR (Godet roller) showed that the maximum strength of the PLA fibers was revealed around 100℃. The degree of crystallinity and the strength of the PLA fibers were decreased above 100℃. The optimal take-up speed (Spinning speed) was around 4,000m/min. Thermal analysis of PLA showed 170℃ and 57℃ as Tm (melting temperature) and Tg (glass transition temperature), respectively.

• 대한원격탐사학회지
• /
• 제39권1호
• /
• pp.99-110
• /
• 2023

Land surface temperature (LST) is a critical environmental indicator affected by land cover (LC) changes. Currently, the most convenient and fastest way to retrieve LST is to use remote sensing images due to their continuous monitoring of the Earth's surface. The work intended to investigate land cover change and temperature response inAn-Najaf province. Landsat multispectral imageries acquired inAugust 1989, 2004, and 2021 were employed to estimate land cover change and LST responses. The findings exhibited an increase in water bodies, built-up areas, plantations, and croplands by 7.78%, 7.27%, 6.98%, 3.24%, and 7.78%, respectively, while bare soil decreased by 25.27% for the period (1989-2021). This indicates a transition from barren lands to different land cover types. The contribution index (CI) was employed to depict how changes in land cover categories altered mean region surface temperatures. The highest LSTs recorded were in bare lands (42.2℃, 44.25℃, and 46.9℃), followed by built-up zones (41.6℃, 43.96℃, and 44.89℃), cropland (30.9℃, 32.96℃, and 34.76℃), plantations (35.4℃, 36.97℃, and 38.92℃), and water bodies (27.3℃, 29.35℃, and 29.68℃) respectively, in 1989, 2004, and 2021. Consequently, these changes resulted in significant variances in LST between different LC types.

• International Journal of Computer Science & Network Security
• /
• 제23권4호
• /
• pp.187-197
• /
• 2023

Today's world is experiencing rapid technological advancement like never before. The ever-changing technology space has overwhelmed citizens with a substantial load of information, which has made it difficult for them to keep up with the technology awareness. This review paper is written to provide information about the Internet of Things in a way that technical along with nontechnical individuals can understand the definition, historical evolution, components, and scope of IoT technology. Relevant literature published between January 2009 and February 2023 was included in this paper. The applications of the Internet of Things in healthcare have been a special focus of this paper as IoT has massive potential in this field and healthcare professionals often face significant issues in keeping their technology knowledge up to date. Moreover, some of the most common issues associated with IoT introduction in healthcare are also discussed in the paper along with some suitable recommendations. Although, IoT can significantly transform our lives and can introduce convenience and efficiency, particularly in the healthcare sector. However, its adoption in healthcare is still a major task due to various challenges presented by the health workforce. Thus, in-depth empirical research is suggested to assist the IoT technology transition.

• KDI Journal of Economic Policy
• /
• 제45권4호
• /
• pp.23-56
• /
• 2023

To investigate the causes of Korea's growth slowdown over the past thirty years, we estimate the contributions of major developmental factors, including i) demographic factors (changes in population growth and workforce age due to the demographic transition), ii) quality-of-life-related choice factors (changes in working hours, education, and the female employment rate), iii) structural change, and iv) the effects of productivity catch-up. Our estimates show that these four groups of factors account for approximately 90 percent of the growth slowdown, with demographic factors contributing approximately 30 percent and the other three groups of factors each contributing about 20 percent. We also show that the same factors explain most of Korea's high growth in the 1980s. These results suggest that Korea's growth slowdown is basically a consequence of its successful economic development and that the high growth and subsequent slowdown can be regarded as a single process. In addition, given that the factors examined here exhibit similar patterns of change in the course of economic development of most countries, we think that our estimation results of the relationship between economic development and changes in economic growth trends could have more general implications that go beyond Korea's experience.

• Bulletin of the Korean Chemical Society
• /
• 제26권12호
• /
• pp.1946-1952
• /
• 2005

New group 15 organometallic compounds, M$(phenanthrenyl)_3$ (M = P (1), Sb (2), Bi (3)) have been prepared from the reactions of 9-phenanthrenyllithium with $MCl_3$. A reaction of 9-(diphenylphosphino)phenanthrene with 2,6-diisopropylphenyl azide led to the formation of (phenanthrenyl)${(Ph)}_2P$=N-(2,6-$^iPr_2C_6H_3$) (4). The crystal structures of 2 and 4 have been determined by single-crystal X-ray diffractions, both of which crystallize with two independent molecules in the asymmetric unit. Compound 2 shows a trigonal pyramidal geometry around the Sb atom with three phenanthrenyl groups being located in a screw-like fashion with an approximately $C_3$ symmetry. A significant amount of CH- -$\pi$ interaction exists between two independent molecules of 4. The phosphorus center possesses a distorted tetrahedral environment with P-N bond lengths of 1.557(3)$\AA$ (P(1) N) and 1.532(3)$\AA$ (P(2)-N), respectively, which are short enough to support a double bond character. One of the most intriguing structural features of 4 is an unusually diminished bond angle of C-N-P, attributable to the hydrogen bonding of N(1)-H(5A) [ca. 2.49$\AA$ between two adjacent molecules in crystal packing. The compounds 1-3 show purple emission both in solution and as films at room temperature with emission maxima ($\lambda_{max}$) at 349, 366, and 386 nm, respectively, attributable to the ligand centered $\pi$ $\rightarrow$ $\pi^\ast$ transition in phenanthrene contributed by the lone pair electrons of the Gp 15 elements. Yet the nature of luminescence observed with 4 differs in that it originates from $\pi$ (diisopropylbenzene)-$\pi^\ast$ (phenanthrene) transitions with the $\rho\pi$contribution from the nitrogen atom. The emission maximum of 4 is red-shifted ranging 350-450 nm due to the internal charge transfer from the phenanthrenyl ring to the N-arylamine group as deduced from the ab initio calculations.

• 한국세라믹학회지
• /
• 제44권3호
• /
• pp.147-151
• /
• 2007

An improvement for the efficiency of the $Sr_{2}SiO_{4}:Eu$ yellow phosphor under the $450{\sim}470\;nm$ excitation range have been achieved by adding the co-doping element ($Mg^{2+}\;and\;Ba^{2+}$) in the host. White LEDs were fabricated through an integration of an blue (InGaN) chip (${\lambda}_{cm}=450\;nm$) and a blend of two phosphors ($Mg^{2+},\;Ba^{2+}\;co-doped\;Sr_{2}SiO_{4}:Eu$ yellow phosphor+CaS:Eu red phosphor) in a single package. The InGaN-based two phosphor blends ($Mg^{2+},\;Ba^{2+}\;co-doped\;Sr_{2}SiO_{4}:Eu$ yellow phosphor+CaS:Eu red phosphor) LEDs showed three bands at 450 nm, 550 nm and 640 nm, respectively. The 450 nm emission band was due to a radiative recombination from an InGaN active layer. This 450 nm emission was used as an optical transition of the $Mg^{2+},\;Ba^{2+}\;co-doped\;Sr_{2}SiO_{4}:Eu$ yellow phosphor+CaS:Eu red phosphor. As a consequence of a preparation of white LEDs using the $Mg^{2+},\;Ba^{2+}\;co-doped\;Sr_{2}SiO_{4}:Eu$ yellow phosphor+CaS:Eu red phosphor yellow phosphor and CaS:Eu red phosphor, the highest luminescence efficiency was obtained at the 0.03 mol $Ba^{2+}$ concentration. At this time, the white LEDs showed the CCT (5300 K), CRI (89.9) and luminous efficacy (17.34 lm/W).

• 과학교육연구지
• /
• 제41권3호
• /
• pp.318-333
• /
• 2017

본 연구에서는 2009개정 교육과정의 중학교 과학교과서에 포함된 탐구 활동이 기존 과학교육에서 강조되어왔던 탐구 기능과 구체적 학생 활동이 강조되는 NGSS의 8가지 과학 실천 측면에서 상호 분석되었을 때 어떤 특성을 나타내는지 생명과학 단원을 중심으로 분석하였다. 분석 결과 학년 구분 없이 탐구 기능에서는 '추리', 관찰', '분류' 순으로 많이 치중되었고, 과학 실천에서는 '자료 분석하고 해석하기'와 '설명구성하고 문제해결 고안하기'에 치우쳐 있었다. 이를 통해 중학교 교과서 내 생명과학 탐구 활동이 탐구 기능뿐만 아니라 과학 실천 요소에서도 다양성이 부족하며 제시하는 활동의 목표가 한정적이라는 것을 보여주었다. 또한 과학탐구 기능과 과학 실천 요소 각 상호 매칭작업을 통해 탐구 기능 중심에서 과학 실천으로의 이행 시 내용 관련성을 검토하고 교과서의 탐구 활동에서 보이는 결과와 비교 분석한 결과 사전 매칭분석에 비해 교과서 내 탐구 활동의 결과가 대체적으로 기초탐구-자료해석/기초탐구-설명고안에 치우쳐 있어서 단조롭게 매칭 되었다. 이는 교과서에 제시된 활동내용의 다양성이 부족함을 보여주는 결과라고 할 수 있다. 본 연구에서는 2009개정 교육과정의 교과서 분석을 통해 단순하고 다양성이 부족한 탐구 활동에서 벗어나 2015개정 교육과정을 구현해나가는 과정에 다양한 과학 실천 요소를 포함시키도록 하는 노력이 절실하게 요구됨을 제언한다.

• 한국산학기술학회논문지
• /
• 제13권6호
• /
• pp.2579-2588
• /
• 2012

본 연구의 목적은 폐경기 중년여성의 피로, 가족기능과 자아존중감의 정도를 파악하고, 이들 변수 간의 관계를 파악하는 것이다. 본 연구는 폐경이행기를 포함하여 폐경기에 해당하는 중년여성 133명을 대상으로 구조화된 설문지를 이용하여 자가보고방식으로 설문조사가 시행되었다. 본 연구를 위한 자료수집 기간은 2012년 3월 2일부터 4월 10일 까지였다. 연구결과, 대상자의 피로정도는 교육수준(F=5.61, p=.005)과 월경상태(F=3.61, p=.030)에 따라 유의한 차이가 있었으며, 가족기능은 교육수준(F=4.49, p=.013), 결혼상태(t=2.25, p=.026)에 따라 유의한 차이가 있었다. 자아존중감은 교육수준(F=5.60, p=.005), 결혼상태(t=2.68, p=.008), 월 소득수준(F=3.51, p=.009)에 있어서 유의한 차이를 나타났다. 대상자의 피로정도는 가족기능(r=-.20, p=.020) 및 자아존중감(r=-.31, p=<.001)과 음의 상관관계가 있었으며, 가족기능과 자아존중감은 양의 상관관계가 있는 것으로 나타났다(r=.45, p<.001). 그러므로 폐경기 중년여성의 피로 및 건강관리를 위한 방안으로 가족기능을 강화하고, 자아존중감을 향상시키는 전략이 도움이 될 것으로 사료된다. 특히, 폐경기 이행기에 해당하는 중년여성의 피로 관리 및 소득과 교육수준이 낮고, 혼자 사는 폐경기 중년여성의 가족기능과 자아존중감의 향상을 위해 가족적, 사회적, 간호학적 지지자원 마련이 필요하다.