• Nuclear Engineering and Technology
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• 제49권3호
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• pp.632-637
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• 2017

Even though the potential for an accident in nuclear power plants is very low, multiple emergency plans are necessary because the impact of such an accident to the public is enormous. One of these emergency plans involves a robotic system for investigating accidents under conditions of high radiation and contaminated air. To develop a robot suitable for operation in a nuclear power plant, we focused on eliminating the three major obstacles that challenge robots in such conditions: the disconnection of radio communication, falling on uneven floors, and loss of localization. To solve the radio problem, a Wi-Fi extender was used in radio shadow areas. To reinforce the walking, we developed two- and four-leg convertible walking, a floor adaptive foot, a roly-poly defensive falling design, and automatic standing recovery after falling methods were developed. To allow the robot to determine its location in the containment building, a bar code landmark reading method was chosen. When a severe accident occurs, this robot will be useful for accident condition monitoring. We also anticipate the robot can serve as a workman aid in a high radiation area during normal operations.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 추계학술발표대회
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• pp.1174-1176
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• 2011

Unfortunately, the number of blind people increases every 5 seconds in our world. An extensive research was made on improving the conventional walking cane and developing a microcontroller based walking stick for the blind with sensors and a feedback in form of vibration. Two different kinds of sensors are used to detect obstacles, ultrasonic and infrared distance sensors. The signal from an ultrasonic sensor is fed to a microcontroller. With the help of the supporting software, the Pulse Width Modulation (PWM) principle is extensively used to form three zones and run the corresponding vibration motor at different spends according to how far the detected object is located. The other infrared distance sensors are connected to amplifiers and after that to their corresponding vibration motors through motor drivers. The vibration motors are to be located around the user's arm to notify the blind of the obstacles in the intended walking way. It can be very reliable and sufficient device guiding the blind other than the conventional walking cane which has many drawbacks which will be explained and discussed.

• 국제학술발표논문집
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• The 7th International Conference on Construction Engineering and Project Management Summit Forum on Sustainable Construction and Management
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• pp.80-88
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• 2017

Although hazard identification is one of the most important steps of safety management process, numerous hazards remain unidentified in the construction workplace due to the dynamic environment of the construction site and the lack of available resource for visual inspection. To this end, our previous study proposed the collective sensing approach for safety hazard identification and showed the feasibility of identifying hazards by capturing collective abnormalities in workers' walking patterns. However, workers generally performed different activities during the construction task in the workplace. Thereby, an additional process that can identify the worker's walking activity is necessary to utilize the proposed hazard identification approach in real world settings. In this context, this study investigated the feasibility of identifying walking activities during construction task using Wearable Inertial Measurement Units (WIMU) attached to the worker's ankle. This study simulated the indoor masonry work for data collection and investigated the classification performance with three different machine learning algorithms (i.e., Decision Tree, Neural Network, and Support Vector Machine). The analysis results showed the feasibility of identifying worker's activities including walking activity using an ankle-attached WIMU. Moreover, the finding of this study will help to enhance the performance of activity recognition and hazard identification in construction.

• 한국화재소방학회논문지
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• 제25권1호
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• pp.72-77
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• 2011

현대 도시는 수평적 토지이용의 제한, 지가 상숭, 인간 요구의 다양화 등으로 인하여 도시기능의 일부를 지하공간으로 흡수하고자 하는 노력이 증가하는 추세이다. 따라서 건축물의 지하층, 지하철 역사 등이 점차 대심도화 되어 지하공간에서 지상으로 피난에 대한 안전성 여부가 부각되고 있다. 그동안 계단에서 군집보행에 관한 연구는 내려가는 군집보행을 중심으로 진행되어 왔으며, 계단에서 올라가는 군집보행에 대한 연구는 거의 전무한 상황이다. 본 연구에서는한 방향 군집유통이 형성되는 지하철 역사 숭강장 내 계단에서 올라가는 군집의 밀도에 따른 보행속도를 직접 실촉하여 조사하였다. 올라가는 보행은 실측결과 경사도 $23^{\circ}$에서 관계식 V=0.638-0.0949p에 의해 보행속도가 결정되며, 이를 일본건축학회에서 제안하는 계단 경사도에 따른 평균보행속도를 근거로 환산하면 경사도 $30^{\circ}$에서는 V=0.597-0.1067p가 되는 것으로 분석되었다.

• 성인간호학회지
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• 제23권4호
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• pp.412-419
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• 2011

Purpose: The purpose of this study was to investigate the effects of a walking and resistance exercise on body composition and lipid profile in obese women. Methods: Fourty three women were assigned to experimental group (n=21) or control group (n=22). The walking and resistance exercise using elastic band was provided three times a week for 12 weeks. Weight, height, body mass index, body fat percentage, abdominal fatness, skeletal muscle mass, body fatness, total cholesterol, triglyceride, HDL cholesterol, and LDL cholesterol were measured before and after the program. Paired and independent t-tests were performed using SAS program. Results: Weight (t=-5.35, p<.001), body mass index (t=-4.12, p<.001), body fat percentage (t=-2.33, p =.026), and body fatness (t=-4.32, p<.001) were significantly decreased and skeletal muscle mass (t=2.09, p =.044) was significantly increased after the walking and resistance exercise. Also, total cholesterol (t=-3.03, p =.006) and LDL cholesterol (t=-2.70, p =.011) were significantly decreased and HDL cholesterol (t=2.05, p =.046) was significantly increased after the exercise program. Conclusion: According to the study result, exercise led a positive outcome on obese women in their 30~40s. The walking and resistance exercise will contribute to the improving body composition and lipid profile in this population.

• 한국멀티미디어학회논문지
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• 제11권12호
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• pp.1676-1687
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• 2008

In this paper, we proposed a new multi-view human recognition method based on face and gait features detection algorithm. For getting the position of moving object, we used the different of two consecutive frames. And then, base on the extracted object, the first important characteristic, walking direction, will be determined by using the contour of head and shoulder region. If this individual appears in camera with frontal direction, we will use the face features for recognition. The face detection technique is based on the combination of skin color and Haar-like feature whereas eigen-images and PCA are used in the recognition stage. In the other case, if the walking direction is frontal view, gait features will be used. To evaluate the effect of this proposed and compare with another method, we also present some simulation results which are performed in indoor and outdoor environment. Experimental result shows that the proposed algorithm has better recognition efficiency than the conventional sing]e view recognition method.

• 대한교통학회지
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• 제35권5호
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• pp.396-408
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• 2017

한국은 고령자가 폭발적으로 증가하고 있다. 또한 고령자의 경제활동과 고령자의 통행빈도 또한 증가 할 것으로 예상된다. 반면에 고령자의 보행 중 낙상 등의 사고는 꾸준히 증가하고 있으며, 고령자의 보행시설 만족도는 최하위이다. 본 논문에서는 이러한 결과의 이유들 중에 하나를 고령자들의 보행능력(일반인 대비 약 75%)을 고려하지 않은 보행 교통 시설물에서 찾았다. 이에 고령자들이 가장 불편함을 호소하는 계단 이용시 나타나는 고령자의 운동역학적인 보행특성을 동작분석시스템으로 알아보았다. 여러 보행변수들을 분석한 결과, 현재의 계단 높이로 규정되어 있는 18cm의 계단 높이는 고령자가 오름과 내림 보행 시 과도한 힘이 소요되며, 신체 중심이 흔들려 몸의 균형을 잡기에도 어려운 것으로 분석되었다. 이에 본 논문에서는 고령자 집단의 보행특성을 보여주는 보행변수들 간의 군집분석을 통하여 계단 챌면의 높이를 15cm 이하로 설정할 것 등의 계단 설계 기준을 제시하였다. 이는 일반인에게는 큰 변화는 아니지만 고령자에게는 통행빈도와 활동범위를 넓혀 보다 많은 사회경제 활동을 촉진 시킬 수 있을 것이다.

• 한국운동역학회지
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• 제25권4호
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• pp.489-498
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• 2015

Objective : The purpose of this study was to analyze the effects of the windlass mechanism in trail-walking shoe prototypes that can effectively support arches. A study of these effects should help with the development of a first-rate trail-walking shoe development guide for the distribution of quality information to consumers. Methods : The subjects were ten adult males who volunteered to participate in the study. Shoes from three companies, which will be referred to as Company S (Type A), Company M (Type B), and Company P (Type C), were selected for the experiment. The subjects wore these shoes and walked at a speed of 4.2 km/h, and as they tested each shoe, the contact area, maximum pressure average, and surface force were all measured. Results : Shoe Type A showed a contact area of $148.78{\pm}4.31cm^2$, Type B showed an area of $145.74{\pm}4.1cm^2$, and Type C showed an area of $143.37{\pm}4.57cm^2$ (p<.01). Shoe Type A demonstrated a maximum average pressure of $80.80{\pm}9.92kPa$, Type B an average of $85.72{\pm}11.01kPa$, and Type C an average of $89.12{\pm}10.88bkPa$ (p<.05). Shoe Type A showed a ground reaction force of $1.13{\pm}0.06%BW$, Type B a force of $1.16{\pm}0.04%BW$, and Type C a force of $1.16{\pm}0.03%BW$ (p<.05). Conclusion : The Type A trail-walking shoe, which was designed with a wide arch from the center of the forefoot to the front of the rearfoot showed excellent performance, however, more development and analysis of the windlass mechanism for a variety of arch structures is still necessary.

• 한국산업정보학회논문지
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• 제25권3호
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• pp.31-38
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• 2020

본 논문에서는 시각장애인을 위한 이동보조시스템을 비교 분석하고, 6개의 장애물 감지 특징을 정리한다. 전통적으로, 시각장애인은 흰 지팡이를 사용하거나 안내견과 함께 보행한다. 최근 IoT 기술의 발달로 시각장애인의 보행을 보조하는 스마트 이동보조시스템이 개발되었다. 이러한 스마트 이동보조시스템은 장애물을 감지하고, 경로를 안내하는 역할을 수행해야 한다. 특히 스마트 이동보조 시스템은 장애물인지 판단하고, 햅틱 피드백을 통해 장애물 정보를 제공한다. 그리고 스마트 시스템은 서버를 구성하여 장애물의 정보를 저장하고, 다른 사용자에게 정보를 공유한다. 또한 저장된 장애물 정보를 통해 사용자 중심의 최적의 경로를 생성하여 시각장애인에게 장애물을 회피할 수 있는 경로를 안내한다. 스마트 이동보조시스템은 기계학습과 인공지능 기술을 적용함으로써 더욱 빠르게 발전할 것이다.

• 국제물리치료학회지
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• 제2권2호
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• pp.329-338
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• 2011

The purpose of this study is to examine the effect of stabilization, resistance exercise, and combined exercise for lumbar on balance and walking ability of elderly. This study selected 22 subjects of over 65 years old elderly women who satisfy the study condition from A, B and C Senior Citizen's Center, in Daegu. The subjects were divided into groups; 7 for resistance exercise group, 8 for stabilization exercise group, and 7 for combined exercise group(resistance and stabilization exercise). The exercises were conducted for 60min a day, three times a week for 12 weeks. Balance and walking ability were checked before the exercise, 6 weeks later, and 12 weeks later. First, all lumbar muscle strengthening exercises were effective for static balance which changed according to exercising period. In dynamic balance, the resistance exercise group showed significant improvement in sit to stand. Stabilization exercise group showed significant improvement in all factors. The combined exercise group showed significant improvement in sit to stand and timed up and go. There was no difference between the exercise types. Second, the resistance exercise group showed significant change in Cadence which changed according to exercising period. The combined exercise group showed significant improvement in all factors. Between the exercise types, combined exercise was a bit more effective than resistance exercise. According to the result of 12 weeks of lumbar muscle exercise, combined exercise is considered to be the most effective exercise to prevent fall as it helps balance and walking ability slightly more than other exercises. Therefore, this study can understand the risk factors for fall accidents that frequently occur among elderly and adopt the combined exercise to prevent fall which in turn will prevent secondary problems occur from fall accidents and improve quality of life of elderly.