• 한국건설순환자원학회논문집
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• 제8권4호
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• pp.404-412
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• 2020

본 연구는 무기질 재료인 Calcium sulfoaluminate(CSA), Crystalline admixture(CA) 그리고 Magnesium oxide(MgO)가 포함된 시멘트 모르타르의 물성 및 자기치유성능을 조사하였다. 자기치유성능을 분석하기 위해 모르타르 강도시험, 물투과성 실험을 실시하였으며, 다양한 균열폭 변화는 디지털 광학현미경을 사용하여 측정하였다. 자기치유를 통해 생성된 수화물에 대해서는 X-ray powder diffraction, Thermogravimetry를 통한 성분분석을 실시하였다. 분석결과 CA치환량이 증가 할수록 압축 및 휨 강도는 증가하였다. 하지만 MgO치환 시에는 오히려 CA치환량이 증가 할수록 압축 및 휨 강도는 감소하였다. 회복된 균열부에 생성된 치유물질은 Ca(OH)2, MgCO3, CaCO3으로 확인되었다. CaCO3은 균열부에 생성된 주요 치유 성분으로 나타났으며, Ca(OH)2, MgCO3보다 높은비율을 차지하고 있는 것으로 확인 되었다. 또한, 물 투과성과 균열폭 결과를 통한 최적의 배합은 CSA 8% + CA 1% + MgO 2.5%으로 나타났다.

• Physical Therapy Rehabilitation Science
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• 제6권3호
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• pp.127-133
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• 2017

Objective: The purpose of this study was to explore the effect of repetitive wrist extension task training with electromyography (EMG)-triggered neuromuscular electrical stimulation (NMES) for wrist extensor muscle recovery in patients with stroke. Design: Randomized controlled trial. Methods: Fifteen subjects who had suffered a stroke were randomly assigned to an EMG-triggered NMES group (n=8) or control group (n=7); subjects in both groups received conventional therapy as usual. Subjects in the experimental group received application of EMG-triggered NMES to the wrist extensor muscles for 20 minutes, twice per day, five days per week, for a period of four weeks, and were given a task to make a touch alarm go off by activity involving extension of their wrist. In the control group, subjects performed wrist self-exercises for the same duration and frequency as those in the experimental group. Outcome measures included muscle reaction time and spectrum analysis. Assessments were performed during the pre- and post-treatment periods. Results: In the EMG-triggered NMES group, faster muscle reaction time was observed, and median frequency also showed improvement, from 68.2 to 75.3 Hz, after training (p<0.05). Muscle reaction time was significantly faster, and median frequency was significantly higher in the experimental group than in the experimental group after training. Conclusions: EMG-triggered NMES is beneficial for patients with hemiparetic stroke in recovery of upper extremity function.

• 전력전자학회논문지
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• 제21권5호
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• pp.396-403
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• 2016

Usually, large-sized buses and trucks have a very high load. In addition, frequent braking during downhill or long-distance driving, causes the conventional method using the brake friction to have a problem in safety because of brake fade and brake burst phenomenon. Auxiliary brakes dividing the braking load is essential. Hence, environment-friendly auxiliary brakes, such as contactless brake rather than the engine auxiliary brake system are needed. A study aimed at improving the energy efficiency by recharging electric energy with changing mechanical to electrical energy that occurs when braking is actively in progress. In this paper, the voltage control method is utilized to recover the electric energy generated in the electromagnetic retarder instead of the eddy current. To regenerate the braking energy into the electrical energy, the resonant L-C circuit is configured in the retarder. The voltage generated in the retarder is simply modeled as a transformer. However, retarder voltage control in this paper is simulated by modeling the induction generator because this induction generator modeling is more practical than transformer modeling. The changes in the voltage of the resonance circuit, which depends on the switch pulse duration of the control device, were analyzed. A PI controller algorithm to control this voltage is proposed. The feasibility of modeling retarder and voltage controller are shown by using MATLAB Simulink in this paper.

• 한국환경과학회지
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• 제20권4호
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• pp.435-442
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• 2011

In this study, to investigate the effects of herb aroma components, the BDI test was performed with the 124 students of the Youngdong University and the subjects whose score was 16 or higher were selected and allocated to the herb-extracted aroma-treated group and the non-treated group, 27 and 10 students for each group. The BDI and SDS tests were carried out at each stage (before and after the treatment, 10 days later and 30 days later). The result showed that the pre-treatment BDI test result was significantly different from all those of the post-treatment test, and the tests after 10 days and 30 days in the aroma-treated group. In the SDS test, the pre-treatment test result was significantly different from the results of the post-treatment test and the test after 10 days, while it was not significantly different from the result of the test after 30 days. Additionally, to verify whether the change within the group is larger than that by natural recovery or not, ANCOVA was performed with respect to the difference in the pre-treatment test score between the groups depending on whether the treatment was given or not, having the SDS pre-treatment score as the covariate, and the result showed that the post-treatment test scores were significantly different. Thus, it was verified that, if the SDS test score is considered as the depression indicator, the effect of aromatherapy was greater than the change by natural recovery. The difference in the post-treatment test score was analyzed depending on whether the treatment was given or not, having the BDI pre-treatment test score as the control variable, and the result showed that the post-treatment test scores were not significantly different. Based on such a theoretical verification, it is assumed that the nature-friendly treatment method using herb aroma components can be a great help in suppressing depression. Therefore, it is expected that herb aroma components can provide systematic therapeutic effect on the suppression of depression.

• 방사성폐기물학회지
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• 제8권1호
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• pp.71-76
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• 2010

사용후핵연료로부터 유용한 물질을 회수하는 파이로 공정의 주요 공정 중 하나인 전해정련 기술과 국내의 전해정련 장치 개발에 대해 고찰하였다. 전해정련 반응은 LiCl-KCl 용융염 전해질 내에 우라늄과 초우란금속 및 희토류 등을 함유하는 사용후핵연료 금속전환체를 담은 양극 바스켓과 고체음극으로 구성되고, 양극에서 는 산화(용해)반응이 음극에서는 환원(석출)반응이 진행되며 순수한 우라늄만을 회수한다. 흑연음극이 가진 자발탈리하는 특성과 아래로 모아진 우라늄 석출물을 스크류 이송장치로 자동 회수하는 개념을 도입하여 처리용량이 20 kgU/day 규모의 연속식 고성능 전해정련장치를 개발하였다.

• 한국농촌생활과학회지
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• 제9권2호
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• pp.51-62
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• 1998

This study was performed to suggest the health management of farmers compared with different farming types, such as rice plant, livestock, horticulture, orchard and others, for the farmer's health enhancement. For this study, 720 subjects were selected in 8 provinces through cluster method, and relevent caculations for the analysis of the subjects were made SAS program, and tested significance with x$^2$ and F value, those probability levels were 0.1%, 1% and 5%. Among the subjects, aged 40's were 38%, females 66%, elementary graduates (32%), and think of living conditions were average (67%). In the self-consciousness test for health, there was no significant difference of farmers with farming types. In the aspect of agricultural work situation, they took holidays according to the weather conditions or no pressed work to be done. And They took a break “when they feel tired during work”. For the recovery of fatigue, sleeping was chosen as the most favorite (68%) followed bathing (17%). but exercise was the lowest (7%). In the case of working conditions, 74% of them replied they work under average condition, and only 9% of them thought they were under pleasant surroundings. And 37% of them have had healthy food, for health practice and restorative for health. 20% of them have had breakfast irregularly. In addition to the regular meal intake, sufficient re자 and pleasant agricultural working conditions would be necessary for health, and the farmers themselves should recognize the importance and care of health. The project for enhancement of the farmers' health is needed and who should give guideline to have the responsibility for health.

• 대한간호학회지
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• 제49권3호
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• pp.349-360
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• 2019

Purpose: This study was conducted to derive a substantive theory on lived experiences of elderly cancer patients. Methods: The data were collected from February to March 2018 through in-depth personal interviews with 14 elderly cancer patients. The collected data were analyzed based on Corbin and Strauss's grounded theory. Results: The core category was "the journey to find balance in daily lives as a cancer patient by recovering disturbed ego integrity." The core phenomenon was "shattered by suffering from cancer," and the causal conditions were "physical change" and "limitations in daily life." The contextual conditions were "decreased self-esteem," "feelings of guilt toward the family," and the sense of "economic burden." The participants' action and interaction strategies were "maintaining or avoiding social relations," "seeking meaning of the illness," "falling into despair," and "strengthening the willingness to battle the cancer." The intervening conditions were "support from health care providers and family," "dissatisfaction with health care providers," "spiritual help from religion," and "the improvement or worsening of health conditions." The consequences were "having a new insight for life," "living positively along with cancer illness," and "the loss of willingness to live." A summary of the series of processes includes the "crisis stage," "reorganizing stage," and the "ego integration stage." Conclusion: This study explored the holistic process of ego integrity impairment and the recovery experience of elderly cancer patients. This study is expected to be used as a basis for the development of nursing interventions that can support patients when coping with all stages of their cancer illness trajectory.

• Journal of Dental Anesthesia and Pain Medicine
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• 제21권1호
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• pp.1-14
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• 2021

This study aimed to evaluate and compare the pre-emptive analgesic efficacy of injected ketorolac to that of other agents for impacted third molar surgical removal in a healthy population. PubMed, Ovid SP, Cochrane databases were filtered from 1980 to July 2020 for potential papers using relevant MeSH terms and pre-specified inclusion and exclusion criteria independently by reviewers. Studies that compared pre-emptive intramuscular or intravenous administration of ketorolac to other agents were evaluated. The outcomes sought were self-reported postoperative pain (patient-perceived pain), median duration for rescue analgesic medication, total number of analgesics consumed in the recovery period, and global assessment (overall patient satisfaction) after the recovery period. Six studies were included in the final evaluation. The outcome of pain perception and the number of analgesics taken were significantly lower in the ketorolac group (intramuscular or intravenous) in most of the studies (n=5) than in the group of other drugs. The mean time for rescue analgesia intake was higher for the ketorolac group, and global assessment scores were also better in the ketorolac group. Although the included studies show significantly better outcomes such as postoperative pain, median time taken for rescue medication, total number of analgesics taken, and overall patient satisfaction with injected ketorolac group in comparison to injected diclofenac, dexamethasone, and tramadol, definitive conclusions cannot be made regarding the superiority of injected Ketorolac as a pre-emptive agent. A greater number of randomized control trials with a proper protocol are needed to make definitive conclusions.

• 한국융합학회논문지
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• 제13권5호
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• pp.531-539
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• 2022

정부는 COVID-19 확산을 방지하기 위해 사회적 거리두기 및 영업시간 제한 등의 정책을 시행하였고, COVID-19 장기 유행에 따라 소상공인들의 피해는 커지고 있다. 정부는 긴급재난지원금을 편성해 소상공인들의 경영압박을 해소하고자 하였다. 긴급재난지원금은 소상공인들에게 일시적인 도움이 되었지만, COVID-19 장기유행에 따라 경영 어려움은 커져갔다. 따라서 본 논문은 시스템 사고의 원형 중(Systme Archetype) 처방의 실패와 짐떠넘기기 원형을 활용하여 소상공인들의 회복력을 효과적으로 높일 수 있는 정책 지렛대로서의 정책 대안들을 탐색적으로 도출하고자 하였다. 소상공인들의 회복력을 높이기 위해 소상공인들의 긴급재정지원과 함께 소상공인들의 자생력을 높일 수 있는 지원이 필요하다.

• 신재생에너지
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• 제19권4호
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• pp.2-10
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• 2023

The current mandatory domestic biodiesel blending ratio is 3.5%, which is planned to be gradually increased to achieve carbon neutrality by 2050. The aim of this study was to improve domestic self-sufficiency in biodiesel raw oil by conducting a technical review on the possibility of utilizing waste oils, such as soup oil, chicken oil, and leather oil, as biodiesel feedstocks. These waste oils have an acid value that is too high to be converted directly into biodiesel. Therefore, a pretreatment to reduce the acid value is necessary. The neutralization process was examined as a potential technology for reducing the acid value. The oil recovery rate of the soup oil after neutralization was significantly low at 37.6 wt%. The oil recovery rates of leather oil and chicken oil were 66.49 wt% and 79.08 wt%, respectively. Based on biodiesel conversion experiment using waste oil with a reduced acid value, the conversions were analyzed as 89 wt%, 91.1 wt%, and 90.5 wt% for soup oil, leather oil, and chicken oil, respectively. Thus, it is technically possible to use soup oil, leather oil, and chicken oil as raw materials for producing biodiesel.