• Journal of Platform Technology
• /
• 제9권4호
• /
• pp.71-78
• /
• 2021

자율주행 차량은 사람의 안전, 환경, 노령화 등의 문제 해결에 새로운 대안으로 부상하고 있다. 또한, 이러한 기술개발은 다른 산업 분야에 파급효과가 매우 크다. 하지만, 이에 따르는 문제점들이 발생한다. 자율주행 차량에 의한 인명 피해는 점점 증가하고 있는 실정이다. 활동성이 없는 물체에 대한 충돌 사고는 다소 줄어들고 있지만, 반대로 활동성을 가진 장애물에 대한 기술 개발은 아직 미미한 편이다. 이에, 본 연구에서는 자율주행차량에서 가장 큰 문제점으로 나타나고 있는 도로 위의 활동성이 있는 장애물을 추출하는 방안을 제안한다. 먼저, 자동차 카메라에 의해 획득한 연속적인 영상에서 핵심장면을 추출한 후, 장면에 포함되어 있는 장애물들에 대한 활동성의 크기와 활동의 반복성 정보를 이용하여 활동성 장애물을 추출하는 것을 제안하였다. 핵심장면은 영역분할과 병합을 통하여 산출한다. 이러한 결과를 바탕으로 영역의 픽셀 별로 빈도의 크기를 산출하고, 활동성의 빈번하게 나타나는 정보를 이용하여 장애물의 활동의 크기를 계산하였다. 사람이 직접 추출한 결과와 비교했을 때 추출 정확도는 다소 떨어지지만 만족할 만한 결과를 얻을 수 있었다. 따라서 제안된 연구가 자율주행의 문제점들을 해소하고 인명사고를 줄이는 방안에 기여할 것으로 사료된다.

• 대한물리의학회지
• /
• 제14권4호
• /
• pp.55-62
• /
• 2019

PURPOSE: This study examined the muscle activity while stepping over obstacles with various heights and widths to provide basic data for training and preventing falls. METHODS: Fifteen normal young adults (seven males and eight females) were recruited. The participants walked on a 5m walkway with six obstacles. The heights of obstacles were 0%, 10%, and 40% of the subject's leg length, and the width of the obstacles was 7cm and 14cm. The participants traversed the course twice per obstacle. The muscle activities of the soleus, tibialis anterior (TA), vastus medialis (VM), and vastus lateralis (VL) were measured using surface electromyography. A Mann-Whitney test and Kruskal-Wallis test were used to examine the differences between obstacles. RESULTS: The muscle activities of the VL and the soleus of the stance leg and lead leg after crossing over the obstacles increased with increasing width, and there were significant differences in muscle activities between obstacle width (p<.05) except for the muscle activity of TA of the stance leg after crossing over the obstacles. A significant difference in muscle activities was observed according to the height of the obstacles with 14 cm (p<.05) except for the muscle activity of the VL, soleus of the leading leg, and TA of the stance leg CONCLUSION: The role of the VL and Soleus increased with increasing obstacle width, and the overall muscle activities of the lower extremities increased with increasing obstacle height. These results can be used to suggest a program to prevent falls.

• 대한물리의학회지
• /
• 제12권3호
• /
• pp.85-91
• /
• 2017

PURPOSE: The purpose of this study was to compare muscle activation of the trunk and lower limbs of subjects wearing high-heeled or flat shoes while crossing over obstacles of different heights. METHODS: Twenty subjects participated in this study. While wearing high-heeled shoes (7 cm) or flat shoes (0 cm), the subjects were asked to cross over obstacles of different heights (10%, 20%, and 30% of their lower-limb length). Muscle activation of the trunk and lower limbs with the supported side while crossing over obstacles of different heights was measured using the electromyogram (Noraxon, DTS, Germany). Two-way repeated ANOVA was used to compare the muscle activation between high-heel shoes and flat shoes while crossing over obstacles of different heights. All statistical analyses were performed using SPSS ver. 21, and p-values less than .05 were used to identify significant differences. RESULTS: As an obstacle's height increased, muscle activation of the trunk and lower limbs with the supported side was increased while wearing either type of shoe, and it was generally higher while wearing high-heeled shoes. However, tibialis anterior muscle activity while wearing high-heeled shoes was lower than while wearing flat shoes. CONCLUSION: This study showed that muscle activation of the trunk and lower limbs was higher when subjects wore high-heeled shoes than when they wore flat shoes while crossing over obstacles of different heights. Therefore, high-heeled shoes can easily cause high muscle fatigue of the trunk and lower limbs, and the TA muscle may weaken in persons who wear high-heeled shoes.

• 한국산학기술학회논문지
• /
• 제19권3호
• /
• pp.171-179
• /
• 2018

기업은 자사의 제품과 기술의 상호운용성을 확보하기 위하여 연구개발과정에서 표준기술을 적용하게 되는데, 이 과정에서 다양한 종류의 장애요인이 발생하게 되며, 활발한 표준화 활동을 통해 이를 극복하려고 한다. 연구개발과정에서 기업의 장애요인과 장애 극복전략 간의 연구는 다양하게 진행되어 왔으나 표준화 과정에서의 장애요인과 장애 극복전략에 관한 연구는 미흡한 상태이며, 표준화와 관련된 장애요인의 유형과 기업의 장애 극복활동에 대한 유형에 대해서도 부족한 상황이다. 이에 본 연구에서는 기업이 표준화 관련 장애요인의 유형을 도출하고, 이러한 장애요인들이 기업의 표준화 활동에 어떠한 영향을 미치는지에 대해 살펴보고자 하였다. 분석을 위해서 한국표준협회가 국내의 전기전자 정보통신 분야에 종사하는 기업을 대상으로 조사하였던 '국내표준실태조사'의 자료를 활용하였으며, 표준관련 장애사항과 필요성 그리고 표준화활동간 관계는 구조방정식 모형을 통하여 검증하였다. 분석결과에 의하면, 표준관련 장애사항은 표준화 활동에 일정한 영향을 미치고, 표준의 필요성에 의한 매개효과가 있는 것으로 조사됨에 따라 많은 기업들이 표준활동에 의한 장애사항이 발생하게 되면 이를 극복하기 위해 다양한 노력들을 수행하고 있다는 것을 알 수 있었다. 따라서 기업은 장애사항을 극복하기 위한 전략적 행동을 스스로 수행함으로써 표준화 활동은 활발해지고 표준관련 연구개발로 인해 발생하는 장애요인들은 감소되는 선순환 구조를 구축하게 될 것으로 판단된다.

• 한국IT서비스학회지
• /
• 제8권2호
• /
• pp.71-87
• /
• 2009

In this paper, the technology innovation for software firms are discussed. Through the literature study, the concepts about this issue and the environment and activity of software firm's the technology innovation related are described. The survey paper was developed for searching the obstacles, policy considerations, and performance of this issue etc. Also questionnaire sheet was made for identifying the relations on technology innovation activities and performance. The degree of understanding about the need of technology innovation were very high according to the analysis result from the response based on the 103 software firms. Among this survey the other results are described as follows; the motivation of technology innovation, the necessity and implementation, the duration acquired for innovation result, the favorite support program as for innovation policy, obstacles for innovation implementation, the reason for innovation collaboration etc. Finally, it is verified statistically that the performance of technology innovation be affected by the employment of external professional technician, research and development, the technical education.

• 제어로봇시스템학회논문지
• /
• 제11권2호
• /
• pp.137-143
• /
• 2005

Autonomous mobile robot has an ability to navigate using both map in known environment and sensors for detecting obstacles in unknown environment. In general, autonomous mobile robot navigates by global path planning on the basis of already made map and local path planning on the basis of various kinds of sensors to avoid abrupt obstacles. This paper provides a global path planning method using self-organizing feature map which is a method among a number of neural network. The self-organizing feature map uses a randomized small valued initial weight vectors, selects the neuron whose weight vector best matches input as the winning neuron, and trains the weight vectors such that neurons within the activity bubble are move toward the input vector. On the other hand, the modified method in this research uses a predetermined initial weight vectors, gives the systematic input vector whose position best matches obstacles, and trains the weight vectors such that neurons within the activity bubble are move toward the input vector. According to simulation results one can conclude that the modified neural network is useful tool for the global path planning problem of a mobile robot.

• 한국운동역학회지
• /
• 제17권4호
• /
• pp.141-148
• /
• 2007

Falls associated with tripping over an obstacle can be dangerous, yet little is known about the strategies used for stepping over obstacles in older Parkinson disease. The purpose of this study was to investigate the lower extremity muscle activity on the obstacle gait according to obstacle height in older Parkinson diseases. The obstacle gait of 7 older Parkinson disease was examined during a 5.0 m approach to, and while stepping over, obstacles of 0, 25, 52, and 152mm. Seven pairs of surface electrodes(Noraxon MyoResearch, USA) were attached to the right-hand side of the body to monitor the adductor longus(AL), gluteus medius(GME), gluteus maximus(GMA), biceps femoris(BF), rectus femoris(RF), gastrocnemius(GA), tibialis anterior(TA). Electromyography data were filtered using a 10Hz to 350 Hz Butterworth band-pass digital filter and normalized to the maximum value in the analyzed phases. A one-way ANOVA for repeated measures was employed for selected electromyography variables to analyze the differences of the height of four obstacles. The results showed significant differences between 0.0mm and 25, 52, and 152mm obstacle height in TA and GA activities during the second phase(swing phase). But the more increase obstacle height, the more not increase the muscle activities. This means that the Parkinson disease stepping over obstacle inefficiency. To prevent and reduce the frequency of falls, elderly Parkinson disease maintained and improved their balance, muscular strength, neuromuscular control and mobility.

• 한국전문물리치료학회지
• /
• 제26권4호
• /
• pp.35-41
• /
• 2019

Background: Obstacle training affects lower limb muscle activity, balance, reducing the risk of falls, and making gait more stable. Objects: This study aimed to investigate the effects of aquatic and ground obstacle training on balance and muscle activity in patients with chronic stroke. Methods: The study subjects included 30 patients with stroke, who were divided into aquatic ($n_1=15$) and ground ($n_2=15$) groups. Groups underwent obstacle training three times per week, 30 min per session, for six weeks that went as follows: walking over sites with the paralyzed leg, stepping onto and down from a box step, and walking over obstacles with the non-paralyzed leg. Results: The experimental results were obtained by comparing muscle activity. Activity of the rectus femoris, biceps femoris, tibialis anterior, and gastrocnemius were significantly increased in the aquatic group (p<.05). Activity of the biceps femoris and tibialis anterior were significantly increased in the ground group (p<.05); however, the rectus femoris and gastrocnemius were not significantly different. In the comparison of maximal distance regarding the limits of stability, it was significantly increased on the non-affected side, affected side, and anterior and posterior distance in the aquatic group (p<.05). It was significantly increased in the non-affected side and anterior and posterior distance the ground group (p<.05); however, maximal distance on the affected side distance was not significantly different. Conclusion: Gait training with aquatic and ground obstacles is effective for improving balance and gait ability of patients with stroke. However, it was more effective for the aquatic group than for the ground group.

• 한국산학기술학회논문지
• /
• 제20권7호
• /
• pp.218-227
• /
• 2019

본 연구의 목적은 밸런스 테이핑요법이 농촌 여성노인의 무릎통증과 일상활동장애 개선에 미치는 영향을 확인하는 것이다. 연구설계는 비동등성 대조군 전후설계를 이용한 유사실험연구이다. 자료수집 기간은 2017년 1월 19일부터 4월 14일까지이며, 연구 대상은 농촌지역인 Y시에 소재한 경로당을 방문한 65세 이상 여성노인 54명으로 실험군 26명, 대조군 28명이다. 자료는 밸런스 테이핑 적용 전과 24시간 후에 무릎통증과 일상활동장애 정도를 조사하였고, 수집된 자료는 PASW Statistics 23.0 프로그램을 이용하여 $X^2-test$, Shapiro-Wilk test, Mann-Whitney U test로 분석하였다. 본 연구결과 24시간 동안 밸런스 테이핑요법을 적용받은 실험군이 대조군에 비해 무릎통증(Z=-6.658, p<.001)과 일상활동장애(Z=-3.466, p=.001) 정도가 유의하게 감소하였다. 일상활동장애의 하위영역 중에서는 일어서기(Z=-2.860, p=.004), 일상적 활동하기(Z=-2.629, p=.009), 걷기(Z=-3.868, p<.001)와 몸단장하기(Z=-2.049, p=.040)의 장애정도가 유의하게 감소하였고, 물건 쥐기(Z=-.542, p=.588)와 팔 뻗치기(Z=-.416, p=.678)는 유의한 차이가 없었다. 본 연구결과 밸런스 테이핑요법은 농촌 여성노인의 무릎통증 감소와 일어서기, 일상적 활동하기, 걷기, 몸단장하기와 같은 일상활동장애 개선에 효과적인 간호중재로 확인되었다. 추후 대상자의 사전 통증정도, 밸런스 테이핑 적용횟수, 24시간이상 적용에 따른 장기효과, 다른 신체 부위 적용에 따른 효과 확인과 밸런스 테이핑 적용이 통증의 감소로 우울감 등 심리 건강에도 효과적인지 파악하는 후속연구, 그리고 밸런스 테이핑 적용이 통증감소와 일상활동장애를 개선시키는 생리학적 기전을 밝히는 연구를 제언한다.

• 한국응용곤충학회지
• /
• 제22권2호
• /
• pp.147-159
• /
• 1983

In general, herbicides have been classified according to selectivity, mobility. time of application, methods of application, mode of action and chemical property and structure. However, there was no generally accepted classification system for practical use in the field. The primary processes affected by the majority of herbicides are the growth process through cell elongation and/or cell division, the photosynthetic process specifically the light reaction, the oxidative phosphorylation and the integrity of the membrane systems. The usual approach in the study of the mechanism by which herbicides kill or inhibit the growth of plants is to initially determine the morphological phototoxicity systems, The mechanism by which a herbicide kills a plant or suppresses its development is actually the resultant effect of primary and secondary(or side) effects. In most instances, the death of the plant is due to the secondary effects. To induce the desired response, a herbicide must be able to gain entry into the plants and once inside, to be transported within the plant to its site(s) of activity in concentrations great enough. Obstacles to the entry and movement of herbicides in plants are generally classified by leaf and soil obstacles, translocation obstacles and biochemical obstacles, and these obstacles are also strongly influenced by plant species and by environmental factors such as light, temperature, rainfall and relative humidity. And hence, in most instances, results obtained from laboratory or greenhous vary from those of field experiment. Author attempted to classify herbicides from the field experiment using the two-dimensional ordination analysis to obtain practical information for selecting effective herbicides or to choose effective herbicide combinations for increasing herbicidal efficacy or reducing the chemical cost. Based on this two-dimensional diagram, desired herbicides or combinations were selected and further investigated for the interaction effects whether these combinations are synergistic, additive or antagonistic. From the results, it was concluded that these new approach could possibly be give more comprehensive informations about effective use of herbicide than any other systems.