• 환경영향평가
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• 제21권5호
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• pp.631-648
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• 2012

The integrative ecological approaches of chemical assessments, physical habitat modelling, and multi-metric biological health modelling were applied to Gwanpyeong Stream within Gap-Stream watersheds to evaluate environmental impacts on the constructions of residential and commercial complex. For the analysis, the surveys conducted from 45 sites of reference streams within the Gap-Stream watershed and 3 regular sites during 2009 - 2010. Physical habitat health, based on the habitat model of Qualitative Habitat Evaluation Index(QHEI) declined from the headwaters(good - fair condition) to the downstream(poor condition). Chemical water quality, based turbidity and electric conductivity(EC), was degraded toward to the downstream, and especially showed abrupt increases, compared to the values of control streams(CS). Also, concentrations of chlorophyll-a in the downstreams were greater compared to the control stream(CS), indicating an eutrophication. Biological health conditions, based on the Index of Biological Integrity(IBI) using fish assemblages, averaged 19.3 which is judged as a fair condition by the biological criteria of the Ministry of Environment, Korea. The comparisons of model metric values in sensitive species and riffle-benthic species on the Maximum Species Richness Line(MSRL) of 45 reference streams indicated a massive disturbances in all sampling locations. Also, tolerance guild and trophic guild analyses suggest that dominances of tolerant species and omnivores were evident, indicating a biological degradation by habitat disturbances and organic matter pollutions. There was no distinct longitudinal variations of IBI model values from the headwater to the downstream in spite of slight chemical and habitat health gradients among the sampling sites. Overall, integrative ecological health(IEH) scores, based on the chemical, physical, and biological parameters, were low compared to the 45 reference streams due to physical and chemical disturbances of massive constructions of the residential and commercial complex. This stream, thus showed a tendency of typical urban streams which are disturbed in the chemical water quality, habitat structures, and biological integrity. Effective stream management plans and restoration strategies are required in this urban stream for improving integrative stream health.

• Journal of the Korean Wood Science and Technology
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• 제51권2호
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• pp.109-132
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• 2023

The objective of this study was to reveal the impact of thinning and pruning regimes on the physical and mechanical properties of clonal teak wood planted in Java. In this study, a 15-year-old clonal teak plantation was carried out and the obtained data were evaluated with analysis of variance (ANOVA). The results showed that different thinning intensities had a significant impact on the alteration of heartwood volume development (F = 25.63; p < 0.0001). Meanwhile, the impact of different thinning treatments in several physical properties depends on the pruning treatment levels [moisture content (F= 12.18, p < 0.0001); tangential shrinkage (F = 15.60, p < 0.0001); T/R ratio (F = 7.17, p < 0.0001); and volumetric shrinkage (F = 10.81, p < 0.0001)]. However, different thinning intensities had no significant impact on wood basic density alteration (F = 0.72, p = 0.486), while pruning intensities affect the differences between radial (F = 3.52, p = 0.030) and volumetric shrinkage (F = 3.13, p = 0.044). In mechanical properties, thinning intensity levels did not promote any significant differences [modulus of elasticity (F = 1.41, p = 0.248); modulus of rupture (F = 0.94, p = 0.392); compressive strength parallel to grain (F = 0.21, p = 0.813); and compressive strength perpendicular to the grain (F = 0.41, p = 0.669)]. Meanwhile, different pruning treatments and combination treatments were not significantly altered all mechanical properties. These results indicated that the thinning and pruning regimes can enhance the mechanical properties without having a serious alteration in the physical properties of clonal teak wood.

• 전기학회논문지
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• 제68권1호
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• pp.145-152
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• 2019

A composite guidance scheme is proposed for air-to-ground anti-tank missiles launched from an airborne platform. Long-range anti-tank missiles usually use a fiber optic line (FOL) for the datalink between an operator and the missile to obtain real-time target information and to command the missile. Also, impact angle control is used to maximize the warhead effectiveness, but it should be carefully implemented due to interference between the launch platform and the FOL. Thus, the proposed guidance scheme takes into account both impact angle and FOL constraints. Under system lag and acceleration limits, a selection method of guidance gains and calculation logic of the maximum achievable impact angle are proposed for a guideline of practical implementation. The performance of the proposed guidance scheme is investigated by nonlinear simulations with various engagement conditions.

• 한국융합학회논문지
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• 제10권6호
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• pp.325-335
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• 2019

본 연구는 한국 교사들의 탈진을 완화시키는데 신체활동이 어떠한 영향을 주는지 알아보는데 목적이 있다. 이러한 목적을 규명하기 위해 한국 교사 527명의 자료가 분석에 이용되었다. 자료처리는 탐색적 요인분석, 문항내적일관성분석을 실시하여 탈진설문지(MBI-ES)의 타당도와 신뢰도를 검증하였고, 성별, 학교급, 교직기간 특성에 따른 평균의 차이를 알아보기 위해 독립 t-test, one-way ANOVA를 실시하였다. 그리고 상관분석과 회귀분석을 통해 요인들 간의 미치는 영향을 검증하였다. 분석 결과, 첫째, 성별의 차이는 남교사보다 여교사가, 교직기간은 긴 것보다 짧을수록 탈진의 정도가 높고 신체활동이 낮은 것으로 나타났다. 둘째, 교사들의 중 고강도 신체활동은 탈진 하위요인들과 부적상관이 있는 것으로 나타났다. 셋째, 교사들의 고강도 신체활동은 비인격화 요인에 부적인 영향을 주는 것으로 나타났고, 교사들의 좌식행동은 비인격화 요인에 정적인 영향을 주는 것으로 나타났다.

• The Journal of Korean Physical Therapy
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• 제34권4호
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• pp.149-154
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• 2022

Purpose: The purpose of this study was to investigate effects of the modified bent arm tornado exercise on weight shift movement and muscle activity of the impact section in the top of the drive swing. Methods: Twenty subjects were divided professional golfer group and amateur golf group. Subjects were required to complete following modified bent arm tornado exercise. The activity and weight shift of the gluteus group and lower extremity muscles between the two groups were measured and the Wilcoxon rank test was analyzed. Results: The distribution of weight shift in the professional golfer group was higher than that of the amateur golfer group (p<0.05). During the golf downswing of the professional golfer group, muscle activation of the lower extremities was higher than that of the amateur golfer group (p<0.05). The distribution of weight shift after exercise by the amateur golfer group was higher than before (p<0.05). Conclusion: We could confirm was increased significantly of muscle activity and weight shift by applying modified bent arm tornado exercise through this study. This result suggests that exercise is needed to improve weight shift.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.774-776
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• 2007

Because many people suffer physical and mental damage from the noise of the traffic facilities including road, rail, airport, the advanced countries have conducted the researches of predicting and solving the impact of the human health exposed to traffic noise. Therefore, this study suggests the fundamental plans which can assess the health impact of traffic noise on the basis of the prediction results about the health impact of traffic noise.

• 한국의류학회지
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• 제38권6호
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• pp.783-795
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• 2014

This study investigates how the physical attractiveness of salespeople and other customers and self-image congruence influence customer perception and brand attitude. As a result of a pretest, four types of pictorial stimuli were developed: physical attractiveness of salespeople (high/low) ${\times}$ that of other customers (high/low). Stimuli were developed using Photoshop CS. A total of 550 samples in two experiments were used and all respondents were women in their 20s and 30s. Data were analyzed using ANOVA and SEM. The result of analysis shows that the physical attractiveness of salesperson had a significant impact on perceived quality, but that of other customers did not. However, self-image congruence with other customers shows a significant effect on perceived quality; however, salespeople did not. The impact of the perceived product quality on brand attitude is higher than perceived service quality. This study adds to fashion retailing literature by demonstrating that physical attractiveness and self-image congruence can influence a customers' perception of product or service quality and brand attitude. It provides interesting insight into how retailers can use social factors as a strategic tool in a retail setting.

• 국제학술발표논문집
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• The 10th International Conference on Construction Engineering and Project Management
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• pp.471-478
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• 2024

Effective physical fatigue monitoring is crucial for ensuring the health, safety, and productivity of construction workers, given the physically demanding nature of their work and the challenging environment in which they operate. In recent years, wearable sensors have shown growing potential for physical fatigue monitoring among construction workers. However, such fatigue assessment methods exhibit a significant gap as they often overlook the impact of inter-individual variability, such as differences in height, weight, and body mass index, on physiological signals that indicate physical fatigue. Therefore, this study aimed to investigate the role of personal factors in altering physiological responses, thereby improving the reliability and accuracy of fatigue monitoring using wearable physiological sensors. To explore the impact of these inter-individual factors, we experimentally analyzed the relationship between personal characteristics, physiological signals, and physical fatigue. Our findings reveal that although the inter-individual factors may not be directly correlated with fatigue levels, they significantly affect fatigue through their influence on physiological signals. Incorporation of these factors into a random forest predictive model significantly enhanced its predictive performance. Furthermore, integrating personal features with other variables to create new features in the physical fatigue prediction model notably improves its accuracy, highlighting the potential for developing personalized fatigue detection systems.

• Physical Therapy Rehabilitation Science
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• 제5권4호
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• pp.178-184
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• 2016

Objective: Tension-type headache is caused by hormones, foods, irritants, stress, obesity, fatigue, and neck and head trigger points-prolonged abnormal posture. The purpose of this study was to evaluate the effects of relaxation approach on head posture, static postural stability, and headache in persons with tension-type headache. Design: Randomized controlled trial. Methods: Thirty-five persons with tension-type headache participated in this study. This study was a pretest-posttest with a control group design for a duration of 4 weeks (60 min/3 times/1 wk). The participants were randomly allocated to the relaxation approach group (n=18) and the control group with conventional rehabilitation including thermotherapy and transcutaneous electrical stimulation for the same period (n=17). Outcome measures involved forward head posture (FHP), foot pressure, neck disability index (NDI), and six-item headache impact test (HIT-6). Results: Relaxation approach and control groups improved significantly in the amount of forward head posture, neck disability index, and six-item headache impact test scores after training (p<0.05). The control group was found to be significantly different in the amount of FHP, backward foot pressure, NDI, and HIT-6 after training compared to before training (p<0.05). The relaxation approach group significantly improved in forward head posture, neck disability index, and six-item headache impact test compared with control group after training (p<0.05). Neck disability index and six-item headache impact test significantly improved after training compared with before training in the control group (p<0.05). However, the foot pressure was not significantly different between relaxation approach and control groups. Conclusions: This study suggests that treatment with relaxation approach combined with self-exercise would be effective in reducing the amount of forward head posture, neck disability and headache impacts.

• 한국환경생태학회지
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• 제25권1호
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• pp.111-117
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• 2011

본 연구는 등산 이용에 따른 등산로 영향 관계의 이해를 통해 등산 이용에 의해 발생되는 영향지표를 설정하고, 실제 현장에서 각 지표의 영향수준을 평가할 목적으로 수행되었다. 문헌조사에 의해 생태적 영향 지표 3가지, 물리적 영향 지표 4가지, 사회적 영향 지표 5가지를 각각 이용영향 지표로 도출하였으며, 이를 이용하여 관악산 등산로를 대상으로 관측조사와 설문조사를 통해 각각의 영향수준을 측정하였다. 등산활동에 의한 생태적 영향으로 등산로 주변 식생교란은 나타났으나 귀화 및 외래식물에 의한 산림식생의 교란은 상대적으로 심하지 않은 것으로 조사되었다. 등산로 노면의 경화, 노폭 확대 등 등산로의 물리적 환경에 대한 영향의 정도는 비교적 심한 것으로 관찰되었다. 사회적 영향 지표의 측정 결과, 관악산 등산로를 찾는 등산객들은 높은 혼잡과 조우 수준을 예상하고 방문하는 것으로 조사되었으며, 이로 인해 실제 현장에서 혼잡도 수준을 높게 느꼈음에도 불구, 전반적인 만족도 수준은 비교적 긍정적인 수준으로 나타났다. 관악산 등산로는 입지적 특성상 대도심권 생활권 등산로 유형으로 지속적이고 집중적인 이용특성으로 인해 등산로의 생태적, 물리적 환경에 대한 영향의 정도가 가중되고 있다. 사회적 영향은 현재까지는 양호한 것으로 나타나고 있으나 등산로 주변환경의 물리적, 생태적 환경이 악화된다면 이용객의 이용 만족도에도 악영향을 미치게 될 것이다. 이용경험의 질적 수준을 유지하기 위해서는 등산로 훼손지 복원과 같은 물리적, 생태적 환경의 개선과 더불어 등산문화 개선을 위한 관리노력 또한 필요할 것으로 판단된다.