측위 방위성과 수신신호세기 값의 관계에 관한 연구

김아솔(Kim A Sol),박도우(Park Do Woo),임창범(Lim Chang Bum),이락희(Lee Rak Hee),박준구(Park Joon Goo) 한국통신학회 2010 한국통신학회 학술대회논문집 Vol.2010 No.6

AP 상대위치 정보를 고려한 향상된 WLAN RSSI 기반 실내 측위 알고리즘

김아솔(A Sol Kim),박준구(Joongoo Park),황준규(Jungyu Hwang) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.2

With the development of mobile internet, requirements of positioning accuracy for the LBS (Location Based Service) are becoming more and more higher. The LBS is based on the position of each mobile device. So, it requires a proper acquisition of accurate user’s indoor position. Thus indoor positioning technology and its accuracy is crucial for various LBS. In general, RSSI (Received Signal Strength Indicator) measurements are used to obtain the position information of mobile unit under WLAN environment. However, indoor positioning error increases as multiple AP"s configurations are becoming more complex. To overcome this problem, an enhanced indoor localization method by AP (Access Point) selection criteria adopting DOP (Dilution of Precision) is proposed.

The Relationship Between Serum 25-Hydroxyvitamin D Levels and Physical Performance in Community-Dwelling Older Adults

Hana Moon,고혜진,김아솔 대한노인병학회 2019 Annals of geriatric medicine and research Vol.23 No.1

Background: Vitamin D deficiency is a risk factor for musculoskeletal health in older adults. While many studies have explored the relationship between vitamin D deficiency and fractures, few have examined the relationship between vitamin D and physical perfor-mance. We, therefore, sought to evaluate the relationship between serum 25-hydroxyvi-tamin D [25(OH)D] levels and physical performance in community-dwelling older adults. Methods: A single-center, cross-sectional study was performed using data collected from 132 individuals aged 60 years or older who were living independently and who participat-ed in the National Health Insurance Service health check-up between May and December 2016. Physical performance was assessed using a short physical performance battery (SPPB). Linear regression was used to examine the association between 25(OH)D levels and physical performance after adjustment for sociodemographic variables, behavioral characteristics, and body mass index. Results: Approximately 36.5% of male and 50.7% of females had vitamin D levels indicative of deficiency (serum 25(OH)D <20.0 ng/mL). 25(OH)D levels were significantly associated with the chair stand SPPB scores in male and females but not with those of the walking and balance tests. After adjustment for potential confounders, there remained a linear association between 25(OH)D levels and the chair stand test for both sexes. Conclusion: Lower serum 25(OH)D levels were associated with poor physical performance (chair stand score) among community-dwelling older adults in Korea. Further prospective studies are needed to verify these results.

Effect of Prognosis Awareness on the Survival and Quality of Life of Terminally Ill Cancer Patients: A Prospective Cohort Study

Hanna Lee,고혜진,김아솔,Sung-Min Kim,문하나,Hye-In Choi 대한가정의학회 2020 Korean Journal of Family Medicine Vol.41 No.2

Background: Physicians and caregivers are conflicted over whether to inform patients that their disease is terminal. Studies examining the effect of awareness of prognosis on the survival and quality of life of terminally ill cancer patients report conflicting results. This study aimed to assess the effects of prognosis awareness on the survival time and psychological health of terminally ill cancer patients. Methods: Patients in the hospice wards of two general hospitals were asked to complete a questionnaire. All were mentally alert and could express themselves clearly. Awareness of prognosis was defined as knowing both the diagnosis and exact prognosis. Survival time was defined as the time from hospital admission to death. Multiple psychological examinations were conducted to verify the effect of prognosis awareness on psychological health. Results: Of the 98 subjects who met the inclusion criteria, 65 (66.3%) were aware of their terminal status. The patients’ awareness was significantly related to survival time after adjusting for clinical variables with a hazard ratio of 1.70 (95% confidence interval [CI], 1.01–2.86). Furthermore, the unaware group had a higher risk of cognitive impairment (Mini-Mental State Examination <24; adjusted odds ratio [aOR], 3.65; 95% CI, 1.26–10.59) and a poorer quality of life (physical component summary of the Short Form 36-item Health Survey <20; aOR, 3.61; 95% CI, 1.12– 11.60) than the aware group. Conclusion: Knowledge of the exact prognosis might have a positive effect on the survival and quality of life of terminally ill cancer patients.

The Relationship of Caffeine Intake with Depression, Anxiety, Stress, and Sleep in Korean Adolescents

진미주,윤창호,고혜진,김효민,김아솔,문하나,정승필 대한가정의학회 2016 Korean Journal of Family Medicine Vol.37 No.2

Background: In various studies in adults, caffeine may increase wakefulness and relieve pain, but caffeine overdosecan cause many adverse serious effects on health. Caffeine intake has recently been increasing in adolescents. Inspite of importance of caffeine effects on Korean adolescents, there are lack of scientific and systematic studies. Thepurpose of our study was to identify the relationship between caffeine consumption and effects on adolescents. Methods: We performed study on 234 middle school students at one middle school in Daegu using a self-reportquestionnaire. We divided students to quartiles according to amount of caffeine intake. We used Beck DepressionInventory (BDI) to evaluate the degree of depression and Beck Anxiety Inventory (BAI) to evaluate the degree ofanxiety. We also used Insomnia Severity Scale (ISI) to evaluate the degree of insomnia and Global Assessment ofRecent Stress (GARS) to evaluate the stress in students. We used logistic regression analysis to identify the relationshipbetween caffeine consumption and effects. Results: Higher caffeine intake was associated with higher weight, height, lower academic achievement, and higherscore in BDI, BAI, ISI, and GARS (P for trend <0.005). Higher caffeine intake quartile was associated with greaterodds of having significant depression (BDI ≥10, P for trend=0.011), and insomnia (ISI ≥8, P for trend=0.015) afteradjustment for factors that can affect the psychological status. Conclusion: We found that caffeine intake is associated weight, height, academic achievement, and higher score inBDI, BAI, ISI, and GARS. Caffeine intake was positively associated with the severity of depression and the severity ofinsomnia among adolescents in Korean.

호스피스 병동의 암환자에서 섬망 발생 위험 요인

고혜진,윤창호,정승은,김아솔,김효민,Ko, Hae Jin,Youn, Chang Ho,Chung, Seung Eun,Kim, A Sol,Kim, Hyo Min 한국호스피스완화의료학회 2014 한국호스피스.완화의료학회지 Vol.17 No.3

Purpose: Delirium is a common and serious neuropsychiatric complication among terminally ill cancer patients. We investigated risk factors related to the development of delirium among hospice care patients. Methods: Between May 2011 and September 2012, we included patients who were mentally alert and had no psychiatric disease or drug addiction at the hospice ward of two local hospitals. Among them, participants who had been diagnosed with delirium by two doctors according to the DSM-IV (Diagnostic and Statistical Manual of Mental Disorders-4th edition) criteria were grouped as Delirium Group. We analyzed results of psychometric and other laboratory tests performed at the time of patient's admission - psychometric tests included cognitive function (mini-mental status examination, MMSE), depression (Beck Depression Inventory, BDI), anxiety, and insomnia (Insomnia Severity Index, ISI). Logistic regression analysis was used to compare delirium and the related factors. Cox's proportional hazard model was performed using significant factors of logistic regression analysis. Results: Of the 96 patients who met the inclusion criteria, 41 (42.7%) developed delirium. According to the logistic regression analysis, primary cancer site, cognitive impairment (MMSE < 24), depression ($BDI{\geq}16$), and insomnia ($ISI{\geq}15$) were significant factors related to delirium. Among the four factors, depression (OR 5.130; 95% CI, 2.009~13.097) and cognitive impairment (OR 5.130; 95% CI, 2.009~13.097) were found significant using Cox's proportional hazard model. Conclusion: The development of delirium was significantly related to depression and cognitive impairment among patients receiving hospice care. It is necessary to carefully monitor depression and cognitive function in hospice care. 목적: 섬망은 말기암환자에서 생길 수 있는 중요한 합병증으로 임상적으로나 삶의 질 적인 측면에서 매우 중요한 문제이다. 이에 호스피스 병동에 입원한 말기암 환자에서 섬망 발생과 관계된 위험 요인들을 알고자 연구를 시행하였다. 방법: 2011년 5월부터 2012년 9월까지 일개 지역 두개의 종합병원 내 호스피스 병동에 입원한 환자 중 의식이 명료하고 다른 정신과적 질환이나 약물 중독이 없는 환자를 대상으로 전향적으로 추적하여 섬망 발생 여부를 확인하였다. DSM-IV 진단기준에 맞게 2명의 의사에 의해 진단된 경우 섬망군으로 분류하였다. 입원 시 인지기능(mini-mental status examination, MMSE), 우울 점수(Beck depression inventory, BDI), 불안 점수, 불면 척도(Insomnia Severity Index, ISI), 혈액검사 결과와 섬망 발생 여부를 로지스틱 회귀분석으로 비교하고, 유의한 항목에 대해 Cox의 비례위험모형으로 교차비를 구하였다. 결과: 선정기준에 부합하는 연구 대상자 96명 중 41명(42.7%)에서 섬망이 발생하였다. 로지스틱 회귀분석 결과 일차 암 위치, 인지기능 장애(MMSE < 24), 우울($BDI{\geq}16$), 불면($ISI{\geq}15$)의 Odds ratio (OR)이 통계적으로 유의한 결과를 보였다. 이들 4가지 인자에 대해 입력 방법을 이용해 시행한 Cox 회귀분석 결과, 우울의 OR 5.130(95% CI 2.009~13.097), 인지기능저하의 OR 5.130 (95% CI 2.009~13.097)로 나타났다. 결론: 호스피스 병동에 입원한 말기암환자에서 우울하거나 인지기능 장애가 있을 경우 섬망 발생의 위험이 유의하게 높았다. 호스피스 환자에게 우울이나 인지기능에 대한 주의 깊은 관찰이 필요할 것이다.

체질량지수와 만성 위축성 위염 및 장상피화생과의 관계

김나리 ( Nari Kim ),윤창호 ( Chang-ho Youn ),김아솔 ( A-sol Kim ),고혜진 ( Hae-jin Ko ),김효민 ( Hyo-min Kim ),문하나 ( Hana Moon ),박수정 ( Sujung Park ) 대한소화기학회 2017 대한소화기학회지 Vol.70 No.2

목적: 본 연구에서는 위암의 전암성 병변으로 알려져 있는 만성 위축성 위염 및 장상피화생과 체질량지수와의 연관성을 확인하고자 하였다. 대상 및 방법: 2013년부터 2014년까지 한국의 일개 지역 두 개의 종합병원 건강증진센터를 방문하여 위내시경을 실시한자 3,028명 중 위 절제술을 시행하였거나 조직학적으로 위암으로 확진되었거나 자료의 결측치가 있는 자를 제외한 2,997명을 대상으로 하였다. 연구 대상자 남녀 각각에 대해 만성위축성 위염 및 장상피화생 유무에 따른 임상적 차이를 분석하였고, 체질량지수를 기준으로 네 군으로 나누어 만성 위축성 위염 및 장상피화생 발생의 교차비를 구하였다. 결과: 만성 위축성 위염 유무에 따른 체질량지수 평균치는 통계학적으로 유의한 차이를 보이지 않았다. 장상피화생 유무에 따른 체질량지수 평균치는 남자에서 각각 24.4, 26.1 kg/m², 여자에서 각각 22.8, 24.9 kg/m²로 남녀 모두 통계적으로 유의한 차이를 보였다. 만성 위축성 위염의 발생에 영향을 줄 수 있는 연령, 음주, 흡연, 장상피화생 여부를 보정하여 시행한 다중 로지스틱 회귀분석에서 남녀 모두 통계적 유의성을 보이지 않았으나, 장상피화생의 경우 연령, 음주, 흡연, 위축성 위염 여부를 보정하였을 때 정상 체중군에 비해 과체중군, 비만군 및 고도비 만군의 교차비가 남자에서 각각 2.25 (95% CI, 1.50-3.37), 2.32 (95% CI, 1.58-3.42), 4.86 (95% CI, 2.04-11.5), 여자에서 각각 2.66 (95% CI, 1.29-5.47), 4.46 (95% CI, 2.28-8.75), 9.57 (95% CI, 3.26-28.12)로 나타났다. 결론: 체질량지수의 증가는 장상피화생 발병과 유의한 연관성이 있는 것으로 나타났다. 추후 전향적 대규모 연구가 필요할 것으로 사료된다. Background/Aims: Chronic atrophic gastritis (AG) and intestinal metaplasia (IM) of the stomach are premalignant lesions. The present study aimed to examine the associations between obesity and these lesions. Methods: A total of 2,997 patients, who underwent gastroscopy, participated in this study, excluding those who had been diagnosed with gastric cancer. Participants were divided into four groups based on their body mass index (BMI). The risk of AG and IM with increasing BMI was analyzed in men and women, separately. Results: The association between BMI and AG was not significant. After adjusting for age, smoking, alcohol, and AG, the odds ratios for IM in the overweight, obesity, and severe obesity groups were 2.25 (95% confidence interval [CI], 1.50-3.37), 2.32 (95% CI, 1.58-3.42), and 4.86 (95% CI, 2.04-11.5) in men, and 2.66 (95% CI, 1.29-5.47), 4.46 (95% CI, 2.28-8.75), and 9.57 (95% CI, 3.26-28.12) in women, compared with the normal BMI group. Conclusions: Gastric IM was significantly associated with increased BMI. (Korean J Gastroenterol 2017;70:81-88)