대학교 금연캠퍼스 정책 효과에 대한 이론적 고찰

이건아 청주대학교 보건의료과학연구소 2020 보건의료과학연구 Vol.8 No.2

This study identified effects of university smoke-free policies to improve health of students, staff, and visitors and prevent tobacco use and secondhand smoke exposure through systematic review. Articles on university smoke-free policies were searched through electronic databases(PubMed & KISS), and reference reviews. In systematic review, there were 6 articles reporting 43 campuses with 8309 participants. Smoke-free campus policies included smoking bans on campus, campaigns including advertisements on an internal campus TV network and internal newspapers, providing educational materials like smoking cessation contact information, and screening students' use of tobacco. The effects of smoke-free campus policies were evaluated by secondhand smoke exposure, tobacco use(self-report survey, direct observation of violators, and cigarette butts), attitudes and beliefs related to smoking, and support for smoke-free campus. This study lends considerable support for efforts towards smoke-free campus.

외부 전자기장에 의한 저잡음 증폭기의 고장 현상 분석

이건아 한국철도학회 2023 한국철도학회논문집 Vol.26 No.2

In this paper, the breakdown phenomenon of a low noise amplifier by external electromagnetic field is analyzed. Lightning and electromagnetic pulses, which have been widely studied in the railroad field, are sources that generate large external electromagnetic fields. These external electromagnetic fields can damage various electronic equipment. Among them, experiments are conducted on low noise amplifier (LNA), mainly used at front end of antenna. In the breakdown experiment, input power is increased from normal operating level to complete failure. Each experiment presents average values after repeating experiment 10 times; an approximate model is presented for each section of the change in gain of LNA, which changes according to input power. This paper is divided into four sections, as follows: 1) Normal operation section, 2) Malfunction section, 3) Inoperable section, 4) Complete breakdown section. It is believed that this approximate model can be used to simulate an LNA that broke down due to external sources of electromagnetic fields, such as lightning strikes or electromagnetic pulses.

이동수단의 실시간 무선전력전송 최적화 설계를 위한 코일의 각도 및 거리에 대한 분석

이건아,이재호 한국철도학회 2023 한국철도학회논문집 Vol.26 No.7

In this paper, we conducted experiments on the structure of coils, coil distances, and angles to analyze the various loss factors that affect wireless power transmission in mobile devices. It was necessary to analyze the impact of these loss factors to increase the transmission efficiency, as there are more diverse loss factors acting on stationary devices than on mobility devices. The experimental results showed that as the angle of the secondary coil increased, the efficiency decreased. However, since the effective area of the secondary coil was maximized, the decrease in output voltage was minimal compared to the decrease in effective area on the plane. Based on this analysis, we propose a design for operation of the secondary coil in mobile devices.

대사증후군 환자의 건강행위 중재효과에 대한 메타분석

이건아,최혜영,양숙자 한국간호과학회 2014 한국간호과학회 학술대회 Vol.2014 No.10

Radioprotective Effect of Silk Peptide Based on its Immunomodulatory Activities

이건아,이지혜,박종흠,박하영,송범석,김재경 (사)한국방사선산업학회 2019 방사선산업학회지 Vol.13 No.4

The objective of this study was to investigate the radioprotective effect of silk peptide (SP)against gamma irradiation-induced damage via its immunomodulatory activity. The proliferation ofRAW 264.7 cells, peritoneal macrophage and splenocyte increased upon treatment with SP followedby irradiation in a dose-dependent manner. The TNF-α and IL-6 secretion levels were the highestin irradiated cells treated with 500 μg·ml-1 of SP. On the other hand, although the IFN-γ and IL-2levels were lower in the irradiated cells, the secretion of these cytokines increased when treated withSP. These results demonstrate that SP enhances the immune response by increasing the macrophageactivity in vitro. The splenocyte’s numbers decreased with gamma irradiation, but the administrationof SP (200 mg·kg-1 B.W.) significantly increased the splenocyte counts. Moreover, the SP treatmentsignificantly increased the IFN-γ and IL-2 secretion in irradiated mice. The mRNA expressionresults indicate that the SP administration prior to irradiation activated the Th1 cytokine (IFN-γ andIL-2) response as well as the expression of cytokines related to radioprotection (TNF-α, IL-6, andIL-1β). The results also showed that the SP administrated mice survived by 30% more than the PBSfeeding group when the mice were irradiated with a lethal dose (6.5 Gy). Thus, the overall resultsproposed that silk peptide could be a good candidate as radioprotective functional food.

Experimental Investigation of Improvement in the Dielectric Recovery Characteristics of a Molded Case Circuit Breaker Splitter Plate

이건아,고광철 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2

The dielectric recovery characteristics of a molded case circuit breaker (MCCB) are related to re-ignition after current-zero. This characteristic afects the interruption reliability of an MCCB because the fault current cannot be interrupted if re-ignition occurs despite trip unit operation. Therefore, to prevent electric leakage during re-ignition, an improvement in the dielectric recovery characteristic is required. In this paper, the infuence of the dielectric recovery characteristics on the splitter plate after current-zero was investigated, and a structure intended to improve the splitter plate was proposed. Measurement of the dielectric recovery voltage confrmed that the proposed structure ofered improvement compared with the existing ones.

동해안 연안침식 관리 정책 비교 분석: 네덜란드 사례를 중심으로

권건아 해양환경안전학회 2020 해양환경안전학회 학술발표대회 논문집 Vol.2020 No.06

가임기 여성의 규칙적 운동 및 운동종류에 따른 대사증후군 간의 관련성

이건아(Guna Lee) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.1

본 연구의 목적은 가임기 여성의 규칙적 운동 및 운동의 종류에 따른 대사증후군 간의 관련성을 파악하여 효과적인 대사증후군 예방 및 관리 중재 개발을 위한 기초자료를 제공하고자 한다. 본 연구는 제7기 3차년도 국민건강영양조사 원시자료(KNHANES Ⅶ-3, 2018년)를 이용하여 만 19세 이상 가임기 여성 4172명을 대상으로 시행하였으며, 규칙적 운동의 종류에 따른 대사증후군 구성요소의 차이는 복합표본 t검정으로, 규칙적 운동의 종류가 영향을 미치는 대사증후군의 유병 위험은 복합표본 다중 로지스틱 회귀분석으로 분석하였다. 가임기 여성의 대사증후군 유병률은 3.1%(128명)이었으며 가임기 여성 중 규칙적 운동 실천군은 1979명(46.5%)이었다. 가임기 여성의 규칙적 운동 실천군은 미실천군과 비교하여 다섯 가지 대사증후군 구성요소 중 수축기 혈압(p =.002), 허리둘레(p<.001)와 공복혈당(p =.007)가 상대적으로 낮았으며 고밀도콜레스테롤(p < .001)는 상대적으로 높았다. 규칙적 운동중 규칙적 근력운동 실천군은 규칙적 근력운동 미실천군과 비교하여 수축기 혈압(p < .001), 이완기 혈압(p = .005), 허리둘레(p < .001), 공복혈당(p < .001)과 중성지방(p = .015) 모두 상대적으로 낮았고 고밀도콜레스테롤(p < .001)은 상대적으로 높았다. 대사증후군에 영향을 미치는 혼란 변수들을 통제한 후, 규칙적 운동 실천군(유병교차비 0.59, 95% 신뢰구간 0.35-0.98, p = .040)과 규칙적 근력운동 실천군(유병교차비 0.34, 95% 신뢰구간 0.14-0.80, p= .013)은 각각 미실천군과 비교하여 대사증후군 유병위험이 낮게 나타났다. 그러므로 규칙적 운동은 가임기 여성의 대사증후군 유병 위험을 낮추는 중요한 변수임을 알 수 있으며, 가임기 여성의 대사증후군 예방 및 관리를 위한 운동 중재 개발 시 근력운동을 포함할 필요가 있음을 제언한다. The purpose of this study was to identify the association between regular physical activity (PA) types and metabolic syndrome (MetS) in fertile women. Data were obtained from the seventh Korea National Health and Nutrition Examination Survey (KNHANES Ⅶ-3, 2018). The sample consisted of 4,172 fertile women over 19 years of age. The data were analyzed using an independent t-test, χ2 test, and multiple logistic regression analysis for examining the association of regular PA and MetS. The prevalence of MetS in fertile women was 3.1% (n =128), and 1,972 fertile women (47.2%) practiced regular PA. Compared to the non-regular PA group, regular PA resulted in a significantly lower systolic blood pressure (p =.002), lower waist circumference (p <.001), lower fasting blood sugar (p =.007), and higher high-density lipoprotein cholesterol (p <.001). After controlling the confounding variables, multiple logistic regression showed that the regular PA group (odds ratio 0.59, 95% confidence interval 0.35-0.98, p =.040) and the regular muscle-strengthen PA group (odds ratio 0.34, 95% confidence interval 0.14-0.80, p =.013) were associated with a decreased risk of MetS. Therefore, regular PA, including muscle-strengthen PA should be considered to develop effective MetS intervention in fertile women.

鮮展側面觀

內野健兒 朝鮮及滿洲社 1928 朝鮮及滿洲 Vol.- No.246

대사증후군에 대한 식이와 운동 효과에 대한 메타분석

이건아(Lee, Guna),최혜영(Choi, Hye-Young),양숙자(Yang, Sook-Ja) 한국간호과학회 2015 Journal of Korean Academy of Nursing Vol.45 No.4

Purpose: This study identified effects of dietary and physical activity interventions including dietary interventions or physical activity interventions alone or combined dietary-physical activity interventions to improve symptoms in metabolic syndrome including abdominal obesity, high triglycerides, low high density lipoprotein cholesterol, elevated blood pressure, and elevated fasting glucose through meta-analysis. Methods: Articles on metabolic syndrome X published from 1988 to 2013 were searched through electronic databases, Google Scholar, and reference reviews. Methodological quality was assessed by the checklist, SIGN (Scottish Intercollegiate Guidelines Network). Results: In the meta-analysis, there were 9 articles reporting 13 interventions with 736 participants. Using random effect models, the dietary and/or physical activity interventions showed a lower mean difference in waist circumference ( - 1.30 cm, 95% CI: - 2.44~ - 0.15, p =.027). The combined dietary-physical activity interventions showed a lower mean difference in waist circumference ( - 2.77 cm, 95% CI: - 4.77~ - 0.76, p =.007) and systolic blood pressure ( - 5.44 mmHg, 95% CI: - 10.76~ - 0.12, p =.044). Additionally, interventions of over 24 weeks yielded a lower mean difference in waist circumference ( - 2.78 cm, 95% CI: - 4.69~ - 0.87, p =.004) and diastolic blood pressure ( - 1.93 mmHg, 95% CI: - 3.63~ - 0.22, p =.026). Conclusion: The findings indicate that dietary and/or physical activity interventions for metabolic syndrome reduce central obesity with no adverse effects. This finding provides objective evidences for dietary and physical activity management on metabolic syndrome as an efficient intervention.