• 농촌지도와개발
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• 제26권2호
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• pp.69-84
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• 2019

Recently rural healing tourism has been attracting tourists' interest in relieving mental stress and restoring physical daily life with nature-friendly experience. The purpose of this study is to explore the urgent problems and challenges of rural healing tourism by conducting focus group interview(FGI) with experts. Fourteen experts were interviewed with a semi-structured questionnaire. From the interview data, six themes were identified for direction of healing tourism development. The results of the study are as follows; The area of rural healing tourism can be explained within the framework of health tourism. As for the difference between rural tourism and healing tourism, rural tourism is expected to enhance physical and mental relaxation, daily restoration, and health promotion if rural tourism expects the understanding and experience of agricultural and rural life, and educational effect. The core components of rural healing tourism were operators' expertise, program with rurality, ecological environment, and storytelling. The findings of this paper implicate the underlying dimension of rural healing tourism from a experts' perspective.

• 영어영문학
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• 제64권4호
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• pp.629-649
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• 2018

To date, one of the prevailing criticisms of Daniel Defoe's Robinson Crusoe has seen the adventure novel as a celebration of the rise of mercantile capitalism and the beginnings of colonialism. From this point of view, the Englishman has often been interpreted as an early embodiment of the concept of the sovereign economic subject. Prominent social critics who took up this interpretation have included Karl Marx, Max Weber, and Jean-Jacques Rousseau. Within literary studies proper, the work of Ian Watt offered perhaps the earliest version of this point of view of the novel. Influenced by both Weber and Rousseau, Ian Watt argued that Defoe's wandering protagonist embodies the rise of economic individualism. More recent criticism has tended to challenge this dominant interpretation by laying greater stress on such countervailing factors as Crusoe's mental uncertainty and inner conflict. Drawing inspiration from Fredric Jameson's diagnosis of the ills of late capitalism, this paper analyzes the ways in which Defoe's hero, rather than championing modern rationality, can in fact be seen as suffering from many forms of emotional psychosis. Robinson Crusoe can, after all, be better viewed as a contradictory multi-layered text that, despite its outward valorization of economic individualism, portrays its hero as a victim of negative capitalistic forces, a hero driven by his desire to possess but haunted by a fear of loss, a hero who flaunts inflated feelings of self-worth even as he reveals deflated notions of material insecurity and mental persecution.

• Journal of Electrochemical Science and Technology
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• 제12권2호
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• pp.285-295
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• 2021

The inverse spinel Cobalt ferrite (CoFe₂O₄, CFO) is considered to be a promising alternative to commercial graphite anodes for lithium ion batteries (LIBs). However, the further development of CFO is limited by its unstable structure during battery cycling and low electrical conductivity. In an effort to address the challenge, we construct three-dimensional hierarchical flower-like CFO nanoclusters (CFO NCs)-decorated carbonized cotton carbon fiber (CFO NCs/CCF) composite. This structure is consisted of microfibers and nanoflower cluster composited of CFO nanoparticle, in which CCF can be used as a long-range conductive matrix, while flower-like CFO NCs can provide abundant active sites, large electrode/electrolyte interface, short lithium ion diffusion path, and alleviated structural stress. As anode materials in LIBs, the flower-like CFO NCs/CCF exhibits excellent electrochemical performance. After 100 cycles at a current density of 0.3 A g^-1, the CFO NCs/CCF delivers a discharge/charge capacity of 1008/990 mAh g^-1. Even at a high current density of 15 A g^-1, it still maintains a charge/discharge capacity of 362/361 mAh g^-1.

• 소성∙가공
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• 제32권3호
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• pp.122-128
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• 2023

As electric vehicles (EV) have increasingly replaced the conventional vehicles with internal combustion engines (ICE), most of automotive makers are actively devoting to the technology development of EV parts. Accordingly, the manufacturing process for power source has been also shifting from engine/transmission to EV motor/reducer system. However, lack of experience in developing the EV motor still remains as a technical challenge. In this paper, we employed the forming simulation based on finite element modeling to solve this problem. In particular, in order to increase the accuracy of the forming simulation, we introduced the elastic-plastic constitutive model parameters for polymer-copper hybrid wire by investigating the individual strain-stress curves, and elastic modulus of polymer and copper. Then, the reliability of modeling procedure was confirmed by comparing the simulated results with experiments. Finally, the identified mechanical properties and finite element modeling were applied to a hairpin forming process, which involves multiple deformation paths such as bending, pressing, widening, and twisting. The proposed numerical approach can replace common experience or experiment based trials by reducing production time and cost in the future.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.126-126
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• 2022

Climate change has continued to impact meteorological factors like rainfall in many countries including Nigeria. Thus, altering the rainfall patterns which subsequently affect the crop yield. Maize is an important cereal grown in northern Nigeria, along with sorghum, rice, and millet. Due to the challenge of water scarcity during the dry season, it has become critical to design appropriate strategies for planning, developing, and management of the limited available water resources to increase the maize yield. This study, therefore, determines the quantity of water required to produce maize from planting to harvesting and the impact of drought on maize during different growth stages in the region. Rainfall data from six rain gauge stations for a period of 36 years (1979-2014) was considered for the analysis. The standardized precipitation and evapotranspiration index (SPEI) is used to evaluate the severity of drought. Using the CROPWAT model, the evapotranspiration was calculated using the Penman-Monteith method, while the crop water requirements (CWRs) and irrigation scheduling for the maize crop was also determined. Irrigation was considered for 100% of critical soil moisture loss. At different phases of maize crop growth, the model predicted daily and monthly crop water requirements. The crop water requirement was found to be 319.0 mm and the irrigation requirement was 15.5 mm. The CROPWAT 8.0 model adequately estimated the yield reduction caused by water stress and climatic impacts, which makes this model appropriate for determining the crop water requirements, irrigation planning, and management.

• 국제학술발표논문집
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• The 8th International Conference on Construction Engineering and Project Management
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• pp.303-312
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• 2020

Safety culture is a collection of the beliefs, perceptions and values that employees share in relation to risks within an organisation. On the other hand, a resilient safety culture (RSC) means a culture with readiness of the organisation to respond effectively under stress, bounce back from shocks and continuously learn from them. RSC helps organisations to protect their interest which can be attributed to behavioural, psychological and managerial capabilities of the organization. Quantification of the degree of resilience in an organisation's safety culture can provide insights about the strong and weak links of the organisation's overall health and safety situation by identifying potential causes of system or sub-system failure. One of the major challenges of quantification of RSC is that the attributes that determine RSC need to be measured through constructs and indicators which are complex and often interrelated. In this paper, we address this challenge by applying a fault tree analysis (FTA) technique which can help analyse complex and interrelated constructs and indicators. The fault tree model of RSC is used to evaluate resilience levels of two organisations with remote and urban locations in order to demonstrate the failure path of the weak links in the RSC model.

• 한국건설관리학회논문집
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• 제24권6호
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• pp.81-90
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• 2023

Climate change has resulted in increased frequency and intensity of heat waves, which poses a significant threat to the health and safety of construction workers, particularly those engaged in labor-intensive and heat-stress vulnerable working environments. To address this challenge, this study aimed to propose an interpretable machine learning approach for forecasting personal heat strain by considering the cumulative effect of heat exposure as a situational variable, which has not been taken into account in the existing approach. As a result, the proposed model, which incorporated the cumulative working time along with environmental and personal variables, was found to have superior forecast performance and explanatory power. Specifically, the proposed Multi-Layer Perceptron (MLP) model achieved a Mean Absolute Error (MAE) of 0.034 (℃) and an R-squared of 99.3% (0.933). Feature importance analysis revealed that the cumulative working time, as a situational variable, had the most significant impact on personal heat strain. These findings highlight the importance of systematic management of personal heat strain at construction sites by comprehensively considering the cumulative working time as a situational variable as well as environmental and personal variables. This study provided a valuable contribution to the construction industry by offering a reliable and accurate heat strain forecasting model, enhancing the health and safety of construction workers.

• Coupled systems mechanics
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• 제12권5호
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• pp.429-444
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• 2023

The comprehension and structural modeling of masonry constructions is fundamental to safeguard the integrity of built cultural assets and intervene through adequate actions, especially in earthquake-prone regions. Despite the availability of several modeling strategies and modern computing power, modeling masonry remains a great challenge because of still demanding computational efforts, constraints in performing destructive or semi-destructive in-situ tests, and material uncertainties. This paper investigates the shear behavior of masonry walls by applying a plane-stress FE continuum model with the Modified Masonry-like Material (MMLM). Epistemic uncertainty affecting input parameters of the MMLM is considered in a probabilistic framework. After appointing a suitable probability density function to input quantities according to prior engineering knowledge, uncertainties are propagated to outputs relying on gPCE-based surrogate models to considerably speed up the forward problem-solving. The sensitivity of the response to input parameters is evaluated through the computation of Sobol' indices pointing out the parameters more worthy to be further investigated, when dealing with the seismic assessment of masonry buildings. Finally, masonry mechanical properties are calibrated in a probabilistic setting with the Bayesian approach to the inverse problem based on the available measurements obtained from the experimental load-displacement curves provided by shear compression in-situ tests.

• 한국가금학회지
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• 제38권3호
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• pp.213-223
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• 2011

본 연구는 매실박과 홍삼박을 사료에 첨가하여 육계 체내 생리활성 효과를 구명하고자 실시하였으며, 이를 위해 고온 스트레스 자극과 LPS 염증 반응을 유도하여 스트레스에 대한 반응을 조사하였다. 이를 위해 고온 스트레스 자극에 따른 생산성 및 혈액생화학 변화를 조사하였으며, LPS로 염증 반응이 유도된 육계에서 immunoglobulin 농도 및 비장 조직내 cytokine mRNA 발현을 조사하였다. 공시계로는 1일령 Ross종 육계수컷 192수를 선별하여 고온 환경(96수)과 일반 환경(96수)으로 구분하였다. 고온 환경은 불쾌지수 86($33^{\circ}C$, 75%)의 고온 스트레스를 자극하여 5주간의 사양 시험을 실시하였으며, 일반 환경은 5주간의 사양 시험 종료 후 LPS를 주입하였다. 환경에 따라 각각 처리당 24수(3수${\times}$8반복)씩 4처리구에 총 96수를 임의 배치하여 실시하였다. 시험구 배치는 무첨가구(negative control; C), 시판 면역 증강제 첨가구(positive control: PC, 25 ppm ${\beta}$-glucan), 매실 부산물 1% 첨가구(PM: plum marc), 홍삼 부산물 3%(RGM: red gingeng marc)로 배치하였다. 고온 스트레스에 대한 혈액생화학 조성에서 매실박 첨가구는 Mg 농도를 높게 유지하여 Ca/Mg 비율을 무첨가구보다 낮게 유지하였으며, 홍삼박 첨가구는 Mg 농도가 무첨가구와 같았지만, Ca 농도를 높여 Ca/Mg 비율을 무첨가구보다 낮게 유지하였다(P<0.05). 따라서 매실박과 홍삼박 첨가구는 고온 환경에서 무첨가구보다 C a/Mg 비율을 낮게 유지하여, Ca/Mg 비율과 정의 상관관계에 있는 cholesterol 수준을 낮추는데 긍정적으로 작용할 것이라 사료된다. LPS 접종 후 IgM 농도는 매실박 첨가구가 무첨가구에 비해 유의적으로 낮은 수준을 나타내었으며(P<0.05), 홍삼박 첨가구는 무첨가구에 비해 낮은 경향을 나타냈지만 유의적인 차이는 없었다. 또한 비장 조직 내 cytokine mRNA 발현에서 홍삼박 첨가구의 경우 공통적으로 IL-1, IL-2 및 IL-6의 mRNA 발현 비율이 무첨가구에 비해 유의적으로 낮았으며, 매실박 첨가구도 IL-1, IL-2에서 무첨가구와 베타글루칸 첨가구보다 낮게 나타났다(P<0.05). 따라서 육계에서 매실박은 LPS 감염 시 IL-1, IL-2 같은 친염증 사이토카인의 발현을 감소시킴으로 염증 반응을 줄여 IgM 상승을 억제하는 것으로 사료된다. 홍삼박 첨가구의 경우 친염증성 사이토카인 억제 효과가 높았지만 항체 농도는 무첨가구와 같은 수준으로 상승하였는데, 생산성, 면역 반응을 개선할 수 있는 첨가 수준에 대한 추가적인 연구가 필요할 것으로 사료된다. 또한 이 실험에서 양성 대조군으로 활용한 ${\beta}$-glucan 전체적으로 긍정적인 효과를 보이지 않았는데, 양성 대조군 활용 시 첨가 수준에 대한 세밀한 검토가 필요할 것으로 사료된다. 결론적으로 매실박과 홍삼박은 고온 스트레스와 외부 병원성 물질 자극에 대한 반응을 최소화하는데 긍적적으로 작용하는 것으로 사료된다.