• PNF and Movement
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• v.19 no.2
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• pp.153-162
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• 2021

Purpose: The purpose of this study was to investigate the difference in the dynamic balance and leg muscle activity of adults in their 20s with or without shoes. Methods: In this study, seven male and 11 female university students in their 20s were randomized to determine the order of being with or without shoes, and the dominant foot was supported on the central platform of dynamic balance according to the order procedure. Using the opposite foot, the distance of leg stretching in the anterior, posterior medial, and posterior lateral directions and the muscle activity of the supporting leg were measured. Muscle activity measurement sites were attached to the dominant vastus medialis oblique muscle, vastus lateral oblique muscle, tibialis anterior muscle, peroneus longus muscle, and lateral gastrocnemius muscle. Results: As a result of this study, the distance of leg stretching was significantly increased in the anterior, posterior medial, and posterior lateral directions when barefoot rather than when wearing shoes (p < 0.05). The muscle activity of the vastus medial and lateral oblique muscles was significantly increased in all three directions when barefoot rather than when wearing shoes (p < 0.05). The muscle activity of the tibialis anterior was significantly increased in the anterior direction when barefoot (p < 0.05), the peroneus longus muscle was significantly increased when it was barefoot in the posterior medial direction (p < 0.05), and the lateral gastrocnemius muscle activity significantly increased when barefoot in the posterior direction (p < 0.05). Conclusion: The movement of the legs is freed when barefoot as compared to when wearing shoes, and being barefoot can effectively activate muscle activity and improve balance ability.

• The Korean Journal of Emergency Medical Services
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• v.25 no.1
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• pp.147-158
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• 2021

Purpose: This study was conducted as a direct investigation of the data in the dispatch logbooks and status of patient transportation provided by private emergency transport companies in Busan. Methods: This study was conducted using SPSS 23.0 version for a total of 1,000 processed records of private emergency ambulance services in Busan from September 23, 2017 to November 5, 2019. Results: First, 100% of the emergency patient transfers by private emergency ambulances were carried out between medical institutions; 76.4% of all transfer patients had emergency conditions, and 86.0% had serious diseases. Second, 59.3% of the emergency patients were located at distances less than 10 km and 43.2%, at more than 10 km from the medical institutions. Third, 63.5% of the passengers were accompanied by first-class emergency rescuers according to the severity of the condition. Fourth, 92.7% of the reasons for the selection of medical institutions were transferred to places where professional care was available, accounting for most of the reasons for the selection. Finally, the medical institutions were selected according to the severity of the patient's condition; 76.5% patients were transported to institutions with a large number of doctors, and 42.9% of those were transported to specialized care institutions. Conclusion: This study collected data from 1,000 dispatch records of private emergency transport companies in Busan; these records reflect the government's policies to improve the emergency patient transfer system. The current status of emergency patient transfer offered by private transport companies was analyzed. All of the emergency patient transfers were carried out between medical institutions, and 76% of the transferred patients had emergency conditions.

• Korean Journal of Occupational Health Nursing
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• v.31 no.1
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• pp.11-21
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• 2022

Purpose: This study aimed to identify the relationship among musculoskeletal problems, sleep problems, and self-rated mental health of home-care workers. Methods: Data were collected from 447 home-care workers spanning three occupation types: life supporters for the elderly, home-visit caregivers, and life supporters for the disabled. Musculoskeletal problems, sleep problems, and self-rated mental health were assessed using structured questionnaires. Factors affecting self-rated mental health were analyzed using multiple regression. SPSS was used to test the mediating effects of sleep problems on musculoskeletal problems and self-rated mental health. Results: Among the general characteristics, the variables that showed significant differences in musculoskeletal problems were monthly income level, caring-related career duration, weekly working hours, and occupation type; and the variable that showed significant differences in self-rated mental health was occupation type. Among the occupation types, supporters for the disabled had the most musculoskeletal problems and the lowest self-rated mental health. Musculoskeletal problems among home-care workers had a direct negative effect on self-rated mental health and indirect negative effects on sleep problems. Conclusion: Measures are needed to reduce the differences in working conditions and health status among the occupation types of home-care workers. Considering the relevance between the health issues of home-care workers, the development of a carefully designed health promotion strategy is required.

• Journal of Surface Science and Engineering
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• v.55 no.3
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• pp.180-186
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• 2022

The production of hydrogen via water electrolysis (i.e., green hydrogen) using renewable energy is key to the development of a sustainable society. However, most current electrocatalysts are based on expensive precious metals and require the use of highly purified water in the electrolyte. We demonstrated the preparation of a non-precious metal catalyst based on CuCo₂O₄ (CCO) via simple electrodeposition. Further, an optimization process for electrodeposition potential, solution concentration and electrodeposition method was develop for a catalyst-substrate integrated electrode, which indicated the highly electrocatalytic performance of the material in electrochemical tests and when applied to an anion exchange membrane water electrolyzer.

• Journal of Home Health Care Nursing
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• v.29 no.2
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• pp.143-152
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• 2022

Purpose: This study aims to describe and explore the experiences of visiting nurses so as to providing high-quality end-of-life care at home. Methods: Data was collected and recorded through in-depth interviews with 11 visiting nurses and transcribed verbatim. The data were analyzed with qualitative contents analysis. Data were collected from April 8 to July 30, 2021. Results: The results revealed the following four themes and ten sub-themes: The main themes were 'Dignified end-of-life caring practice at home', 'Providing integrated support of end-of-life family caregivers', 'Confronting the limits of visiting nursing at the end of life' and 'Reflection on life and feeling rewarded'. Visiting nurses have performed dignified end-of-life care at home and integrated support for family caregivers. Although the visiting nurse sometimes faced the limits of visiting nursing during end-of-life care, it was surveyed that they rewarded on their lives and felt rewarding through the end-of-life nursing experience. Conclusion: Practical and systematic training is needed to positively change the end-of-life care of visiting nurses. We propose programs, such as expert counseling, to improve coping skills in end-of-life care practice at home. Additionally, we propose various institutional supports which can support the limitations of end-of-life care provision.

• Journal of the Korea institute for structural maintenance and inspection
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• v.27 no.1
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• pp.103-108
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• 2023

In this study, basic research was conducted to secure microbial resources applicable to autonomous crack healing concrete. To this end, in this experiment, biomineral-forming microorganisms were separated from natural sources, and the ability of survival in cement and calcium carbonate precipitation were compared to secure suitable microbial resources. Bacillus-type bacteria forming endospores were isolated from the sample, and the amount of calcium carbonate produced by the six microorganisms identified by 16S rRNA sequencing was compared. Two types of microorganisms, Bacillus velezensis and Bacillus subtilis, with the highest calcium carbonate precipitation were selected, and the survival of the microorganisms was confirmed through phase contrast microscopy after being cured after being added to the mortar. In addition, it was confirmed that the autonomous crack healing capability by the crack healing material produced by microorganisms was confirmed by artificially generating cracks in the mortar.

• Journal of Surface Science and Engineering
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• v.56 no.4
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• pp.243-249
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• 2023

Urea oxidation reaction (UOR) via electrochemical oxidation process can replace oxygen evolution reaction (OER) for green hydrogen production since UOR has lower thermodynamic potential (0.37 V_RHE) than that of OER (1.23 V_RHE). However, in the case of UOR, 6 electrons are required for the entire UOR. For this reason, the reaction rate is slower than OER, which requires 4 electrons. In addition, it is an important challenge to develop catalysts in which both oxidation reactions (UOR and OER) are active since the active sites of OER and UOR are opposite to each other. We prove that among the NiFe₂O₄ nanoparticles synthesized by the hydrothermal method at various synthesis temperatures, NiFe₂O₄ nanoparticle with properly controlled particle size and crystallinity can actively operate OER and UOR at the same time.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.380-380
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• 2023

기후변화와 도시화에 따른 개발사업으로 인하여 재해 위험성은 날로 증가하고 있다. 이로 인한 재해의 영향을 최소화하기 위해 각종 개발사업 시 자연재해대책법에 따라 사전에 자연재해에 따른 피해를 예방하기 위한 목적으로 재해영향평가 협의가 시행되고 있다. 재해영향평가 협의에서 홍수로 인한 재해예방을 위해 개발사업으로 인한 홍수유출 증가량 검토하고 저감 대책을 제시하게 된다. 이중 소규모 재해영향평가는 면적 5천m² 이상 5만m² 미만의 개발사업을 대상으로 실시되고 있으며, 이를 위한 첨두홍수량 산정 방법으로는 합리식, clark단위도법 등이 사용되고 있다. 소규모 유역의 첨두홍수량을 합리식, 단위도법 등으로 산정할 경우 도달시간이 매우 짧아 홍수량이 과다하게 산정된다. 이를 방지하기 위해 합리식에서는 강우지속기간을 늘리기 위해 일정 유입시간을 고려하고 있으며, 단위도법에서는 유역반응시간을 조정하고 있다. 기존의 연구에서 clark단위도법에서 저류상수 매개변수 보정을 7 ~ 10분으로 적용하도록 하고 있다. 본 연구에서는 화성, 양주, 청주지역의 소규모 재해영향평가협의 대상인 공장부지 조성사업의 홍수량 산정시 저류상수 매개변수 조정 사례를 조사하고 그 중 유역의 상황변화를 고려하지 않고 개발 후 매개변수 조정을 10분으로 적용한 10개 사업을 대상으로 선정하였다. 본 연구에서는 개발 후 매개변수 보정량을 10분을 7분으로 변경하여 홍수량을 산정하였다. 10개 사업 홍수량 산정결과 「재해영향평가등의 협의 실무지침 (2021.01, 행정안전부)」에서 제시하는 소유역 비홍수량의 범위인 25 ~ 35m³/s/km²에 8개 사업이 만족되었고, 2개 사업은 개발 후 비홍수량이 제시 범위를 다소 초과하였고, 홍수량의 증가는 4.7 ~ 16.3% 범위로 나타났다. 소규모 유역에서 저류상수 보정량이 홍수량 산정에 미치는 영향이 큰것을 감안하면 유역의 도시화등 상태변화 비율 및 소유역 면적별로 매개변수 조정량을 정량화하는 추가 연구가 필요하다.

• Journal of Practical Agriculture & Fisheries Research
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• v.13 no.1
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• pp.47-69
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• 2011

The purpose of this study is to suggest strategies for vitalizing Jeju citrus export-specialized organization. To achieve the goal, the research has been focused on the establishment and standardization for fruit production practices that can keep a steady supply of high quality citrus fruit for export market, and followed by systematization of farms using the practices. According to the research findings, it is desirable that the high quality fruit production manual such as the Global GAP must be established, developed and prepared to train farm households. The establishment of the high quality fruit production manual is focused on the items as follows : 1) labor productivity enhancement by structural improvement of farm layout, 2) the practices for high-sugar-fruit production such as thinning out, irrigation and drainage system, and mulching with a poromeric sheet 3) productivity enhancement and quality improvement of fruit by cultivar improvement and virus-free nursery trees, 4) standardization of cultural practices throughout the citrus fruit production.

• Journal of Practical Agriculture & Fisheries Research
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• v.14 no.1
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• pp.23-45
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• 2012

The objective of this study is to provide development strategies in the production and distribution system of highland Chinese cabbage by evaluating and analyzing problems of the current system, focusing on several main stages between production and distribution system of highland Chinese cabbage. Through interview of groups such as farmers, distributers in the main producing areas, commission merchants of the wholesale market and large-scale distributors the relavant information was collected. Also, data such as production situations in main producing areas, distribution conditions in the wholesale market was analyzed. The functions of highland Chinese cabbage were classified and the current state of highland Chinese cabbage distribution system was investigated to provide an overall insight into the highland Chinese cabbage distribution system. Also the factors which will affect a price of wholesale market and consumer of highland Chinese cabbage were examined. Finally problems and improvements in the production and distribution system through analysis of the distribution system of highland Chinese cabbage were provided. the main contents of this study are as follows. The first is to keep stability of production in main producing areas by applying a differentiated production method, for example, rainshelter cultivation method. The second is to establish the distribution system which the relevant information is opened transparently. The third is that the consistent cold transportation system from main producing areas to consumers must be built.