• Journal of Preventive Medicine and Public Health
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• 제53권6호
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• pp.397-404
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• 2020

Objectives: The objective of this study was to demonstrate the effects of community-based social distancing interventions after the first coronavirus disease 2019 (COVID-19) case in Turkey on the course of the pandemic and to determine the number of prevented cases. Methods: In this ecological study, the interventions implemented in response to the first COVID-19 cases in Turkey were evaluated and the effect of the interventions was demonstrated by calculating the effective reproduction number (R_t) of severe acute respiratory syndrome coro navirus 2 (SARS-CoV-2) when people complied with community-based social distancing rules. Results: Google mobility scores decreased by an average of 36.33±22.41 points (range, 2.60 to 84.80) and a median of 43.80 points (interquartile range [IQR], 24.90 to 50.25). The interventions caused the calculated R_t to decrease to 1.88 (95% confidence interval, 1.87 to 1.89). The median growth rate was 19.90% (IQR, 10.90 to 53.90). A positive correlation was found between Google mobility data and R_t (r=0.783; p<0.001). The expected number of cases if the growth rate had not changed was predicted according to Google mobility categories, and it was estimated to be 1 381 922 in total. Thus, community-based interventions were estimated to have prevented 1 299 593 people from being infected. Conclusions: Community-based social distancing interventions significantly decreased the R_t of COVID-19 by reducing human mobility, and thereby prevented many people from becoming infected. Another important result of this study is that it shows health policymakers that data on human mobility in the community obtained via mobile phones can be a guide for measures to be taken.

• 한국의류산업학회지
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• 제26권1호
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• pp.123-136
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• 2024

This study aimed to assess the mobility and thermal comfort of personal protective equipment (PPE) among female healthcare workers, taking into account wearers' physique and PPE protection levels. A total of 16 participants (age: 26.3 ± 8.3 y, height: 161.5 ± 7.3 cm, body weight: 57.1 ± 11.0 kg, BMI: 21.9 ± 3.6), representing diverse body types, underwent four PPE conditions: L (Low_Plastic gown ensemble), M (Medium_Tyvek 400), H (High_Tyvek 800J with Powered Air Purifying Respirator [PAPR]), and E (Extremely high_Tychem 2000 with PAPR, Bib apron, and Chemical-resistant gloves). The mobility protocol consisted of 10 different tasks in addition to donning and doffing. The 10 tasks were repeated twice at an air temperature of 24.3 ± 0.1℃, 59±4%RH. Findings revealed a disproportionate relationship between PPE protection and wearer discomfort. Significant differences in clothing microclimate and total sweat rate were observed between the lowest (L) and highest (E) protection levels (p < 0.01), while distinctions among medium levels were inconclusive. Subjective evaluations favored conditions H and L over M and E (p < 0.05), indicating reduced heat, and humidity, increased comfort, and lower exertion. Instances of mobility discomfort, specially in the small body type group, underscored the need for a suitable PPE size system for Korean adult female medical workers. Furthermore, enhancements in gloves, shoe cover, and PAPR hood designs are essential for improving ease of movement and preventing hindrance.

• 융합신호처리학회논문지
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• 제18권1호
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• pp.6-12
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• 2017

본 논문에서는 모션인식을 활용한 Human UI/UX를 위한 IoT 기반 스마트헬스 서비스를 제안한다. 현재까지 M2M기반의 u-healthcare에서 적용되는 센서 네트워크에서는 TCP/IP 프로토콜이 아닌 non-IP프로토콜을 이용하고 있다. 그러나 서비스의 이용 확대와 IoT 기반의 센서 네트워크 관리를 용이하게 하기 위해서는 다수의 센서들의 인터넷 연결이 반드시 요구된다. 따라서 센서들에 의하여 측정된 자료들을 인터넷과 통신하는 것은 물론 이동이 가능해야 하기 때문에 네트워크 이동성을 고려한 IoT 기반 스마트헬스 서비스를 설계하였다. 또한 IoT 기반 스마트헬스 서비스는 기존의 헬스케어 플랫폼과는 다르게 바이오 정보뿐만이 아니라 동작감지를 위한 스마트 헬스 서비스를 개발하였다. u-healthcare에서 사용되는 WBAN 통신은 일반적으로 많은 네트워크화된 장치 및 게이트웨이로 구성된다. 본 논문에서 제안하는 방법은 WBAN 센서 노드간의 이동성을 지원하는 기술을 이용함으로써 무선 환경에서도 동적 변화에 쉽게 대응할 수 있고, 사용자의 동작감지를 통해 체계적인 관리가 이루어진다.

• 한국항행학회논문지
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• 제26권5호
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• pp.281-288
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• 2022

본 연구에서는 무게 약 1톤, 속도 약 100km/h에 달하는 멀티콥터 형 UAM(Urban Air Mobility)가 도심 지역에서 추락했을 때 발생할 수 있는 인명피해를 정량적으로 분석하였다. UAM 수요가 가장 많을 것으로 예상되는 서울지역의 인구밀도 및 건물 데이터 베이스를 기반으로 UAM 추락 시 충돌에 노출되는 인구를 도출하였고 멀티콥터 형 비행체가 제어 불가능한 상태에서의 무동력 추락을 고려하여 항력을 고려한 자유낙하 모델을 통해 UAM 추락 시 사고영향 반경을 계산하였다. 더불어, 사고영향 반경이 증가할 때 지상의 인명피해의 변화를 분석하였다. 최종적으로 서울지역에 대한 UAM 추락 시 지상 인명피해 맵을 생성하였고 서울의 대부분의 지역에서 UAM 추락 시 약 1~10명 내외의 인명피해가 발생할 수 있음을 확인하였다. 이를 통해 TLS (Target Level of Safety)를 만족하는 UAM의 고장률 요구사항을 분석하였다.

• 한국지능시스템학회논문지
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• 제26권2호
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• pp.153-159
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• 2016

본 논문는 대각선 주행이 가능한 전방향 퍼스널 모빌리티의 메커니즘을 제안한다. 현대 사회에서 이동성은 인간의 기본적인 활동을 영위하는데 수반되는 전제조건이다. 퍼스널 모빌리티는 새로운 이동수단으로 자동차와 동일한 바퀴구조를 가지고 있으며 이동성 역시 자동차와 유사하다. 최근 노약자와 교통약자를 위한 퍼스널 모빌리티도 4륜 전동카트가 널리 보급되었다. 일반적으로 전동카트는 주행경로를 변경할 때 차체는 조향하는 방향으로 회전하며 이 때 곡률반경에 따른 충분한 공간을 확보해야 한다. 제안하는 퍼스널 모빌리티는 대각선 주행이 가능해지면서 이동성의 한계를 극복할 수 있다. 또한 주행경로에 장애물이 존재하거나 건물내부와 같은 좁은 공간에서도 주행이 가능해지면서 교통약자도 다양한 주행환경을 극복할 수 있다. 이 논문에서는 제안하는 퍼스널 모빌리티의 메커니즘과 개발한 퍼스널 모빌리티의 조향성능을 실험하고 대각선 주행이 가능함을 입증한다.

• 대한전자공학회논문지TC
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• 제46권4호
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• pp.13-28
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• 2009

DTN(Delay/Disruption Tolerant Network)에서 라우팅 프로토콜은 전송 지연 및 성공적인 전달 확률의 성능을 개선하기 위해 중요하다. 이 논문에서 우리는 이동성 유형 기반의 라우팅(MPR ; Mobility Pattern based Routing)이라는 효과적인 DTN 라우팅 알고리즘을 제안하는데 이는 이동 노드의 이동성 유형에 근거해 복사되는 메시지의 수를 제어하게 된다. 또한, 우리는 인간 이동성 유형을 가장 잘 나타낼 수 있는 확산성이 매우 큰(super-diffusive) 성질을 가지는 실제적인 "Levy Walk" 이동성 유형을 고려하였다. 우리는 제안된 MPR 알고리즘과 Levy Walk 이동성 유형의 검증을 위해 ONE simulator를 이용한 DTN simulator를 구현하였다. 시뮬레이션 결과 이동성 유형이 DTN 라우팅 성능의 정확한 분석을 위해 매우 중요하다는 것과 제안한 MPR이 실제 이동성 유형 하에서 성공적인 전달 확률이나 전송 지연 측면에서 라우팅 성능을 향상시킴을 보였다.

• 대한가정학회지
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• 제36권1호
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• pp.65-79
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• 1998

The purposes of this study were to establish a conceptual model on the woman's labor force participation and mobility in the labor market and to analyze the correlation between them. Included in those models were two independent variable sets. The one was related to household's financial conditions and the other was associated to the woman's role such as marital status, the number of children and the existence of young children. KHPS's national data was used and the Binomial Probit Model and Bivariate Probit Model were employed to analyse the effects of independent variables and the correlations between two dependent variables. The results of this study were as follows. The rate of women's labor force participation and the percentage of mobility willingness were 15.4% and 22.0%. Among the variables which have affected women's labor force participation were total wage income, non-wage income, expenditure on children's education and the subject judgement of their financial status. The existence of children under the age of 6 and marital status had significant influences on women's mobility willingness. The correlation between women's labor force participation and mobility willingness was very significant statistically. These findings clarified the status of woman as a secondary worker and pointed that a woman's economic activity would be subject to the woman's condition rather than her human capital.

• 한국의류산업학회지
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• 제25권4호
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• pp.520-533
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• 2023

The present study developed a test protocol for evaluating the mobility of firefighting chemical and flame personal protective equipment (PPE) for the National 119 Rescue Headquarters in Korea and suggested ergonomic design factors to improve their mobility and performance. Six types of PPE were employed, including three types for flame protective PPE (5 ~ 6 kg excluding the self-contained breathing apparatus), and three types for chemical and flame protective PPE (8 ~ 11 kg). These PPEs are used by the 119 Rescue firefighters. Three male firefighters (34.3 ± 1.2 y in age, 175 ± 8 cm in height, 81 ± 13 kg in body weight) participated in the mobility test and interview. A mobility test protocol consisting of 16 components (nine postures and seven motions including a dexterity test) along with a visibility test were developed based on pre-interviews and literature reviews. The findings indicated that the clothing microclimate humidity on the neck and chest exceeded 85%RH on average for all the six PPE conditions, with the chest area reaching as high as 98%RH. This high humidity caused fogging inside the visor and impaired visibility. The requirements for improving the PPE design in terms of mobility varied depending on whether it was the separated types or all-in-one types, particularly regarding the hood and gloves design. The findings of this study can be applied to improve the design of Level A_PPE for firefighters. The mobility test protocol and visibility test developed in this study can also be applied to other types of Level A impermeable PPE.

• 로봇학회논문지
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• 제17권2호
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• pp.209-215
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• 2022

In this paper, a forearm Mechanism design inspired by ligamentous structure of the human body is proposed. The proposed mechanism consists of four rigid bodies and fourteen wires without any mechanical joints. Actually, the mechanism is based on the concept of the tensegrity structure. Therefore, the proposed mechanism has inherently compliant characteristics due to the flexibility of the wires composing the structure. Rigid bodies and wires of the mechanism mimic bones and major ligaments in the forearm of the human. The proposed mechanism is classified as one of the interconnected hybrid flexure systems. The analysis method of the degree of freedom (DOF) of the proposed mechanism is also introduced through analyzing technique of the interconnected hybrid flexure systems, in this paper. Ultimately, the proposed mechanism, whose structure is complicated with rigid bodies and wires, mathematically drives that it has 3-DOFs.

• 한국의류산업학회지
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• 제24권5호
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• pp.655-665
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• 2022

This study evaluated the validity of a newly developed mobility protocol examining the comfort functions and requirements of personal protective equipment (PPE) for COVID-19 healthcare workers. Eight males (age: 24.7 ± 3.0 y, height: 173.4 ± 2.3 cm, and body weight 69.9 ± 3.7 kg) participated in the following three PPE conditions: (1) Plastic gown ensemble, (2) Level D ensemble, and (3) Powered air purifying respirator (PAPR) ensemble. The mobility protocol consisted of 10 different tasks in addition to donning and doffing. The 10 tasks were repeated twice at an air temperature of 25oC with 74% RH. The results showed significant differences among the three PPE conditions in mean skin temperature, local skin temperatures (the forehead, thigh, calf, and foot), clothing microclimate (the chest and back), thermal sensation, thermal comfort, and humidity sensation, while there were no significant differences in heart rate or total sweat rate. At rest, the subjects felt less warm and more comfortable in the PAPR than in the Level D condition (P<0.05). However, subjective perceptions in the PAPR and Level D conditions became similar as the tasks progressed and mean skin and leg temperature became greater for the PAPR than the Level D condition (P<0.05). An interview was conducted just after completing the mobility test protocol, and suggestions for improving each PPE item were obtained. To sum up, the mobility test protocol was valid for evaluating the comfort functions of PPE for healthcare workers and obtaining requirements for improving the mobility of each PPE item.