• Title/Summary/Keyword: forest working

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Visual Preference Evaluation of Forest Stands toward Forest Working Systems (산림작업에 따른 임분의 시각선호도 평가)

  • Song, Hyung Sop;Oh, Do Kyo
    • Korean Journal of Agricultural Science
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    • v.30 no.2
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    • pp.139-147
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    • 2003
  • The main purpose of this study is to obtain forest scenic beauty management informations toward forest working systems in pinus densiflora forest stands, etc. To get these information, visual preference and spatial image analysis methods are used. 25 different alternatives were simulated to visualize on basis of actual forest working methods with taken photos from May to July, 2003. The options were illustrated as photos produced by computer software. Respondents' ratings for 25 landscape scenes were obtained by interview survey method. Each alternatives were evaluated by forest major student group with total 103 respondents after reliability test. Visual preference evaluation was used 10 point rating scale. Spatial images of 12 alternatives were measured by 12 semantic differential scale. In general, the respondents preferred refreshing and ordering forest stand after forest working to natural forest stand before forest working. High visual preference for forest density produces 400-600 trees/ha in small diameter class forest stands. Regarding visual preference according to pavement type of trail, soil trail is ranked high. Visual preference for cutting area ranks mature forest stand and visual preference for trail slope cover type ranks shrub with grass as relatively high on the preference scale. Through the factor analysis, spatial images of 12 coniferous forest stands are classified as 'ordered opened' and 'beautiful healthy'. Results indicate how to conduct forest working systems for forest scenic beauty management.

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Visual Preference Evaluation on Forest Working Systems' Characteristics for Forest Scenic Beauty Management (산림풍치자원관리(山林風致資源管理)를 위한 산림시업특성별(山林施業特性別) 시각선호도(視覺選好度) 평가(評價))

  • Song, Hyung Sop
    • Journal of Korean Society of Forest Science
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    • v.88 no.3
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    • pp.309-319
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    • 1999
  • This study was conducted to get forest scenic beauty management information toward forest working systems; characteristics in Larix forest stands. 35 different alternatives were simulated to visualize on basis of actual forest working methods. The options were illustrated as photos produced by computer software. Each alternatives were evaluated by 3 groups with total 593 respondents after reliability test. Visual preference evaluation was used 1 - 10 point rating scale. The ratings were scaled using SBE analysis program of RMRATE. To compare the relationship of visual preference and image scale, Spatial images of 13 thinning alternatives were measured by Semantic differential scale. In general, the respondents preferred refreshing and ordering forest stand after forest working to natural forest stand before forest working. Visual preference decreased with the increasing intensity of bare ground area and slash area in forest stand. And also, visual preference was high related to tree density, clear length of stem, and ground vegetation. Farm line of small clear cutting area was preferred straight line to curve line. Visual preferences were significant differences in certain socioeconomic variables of the respondents. Results indicate how to conduct forest working system for forest scenic beauty management.

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A Study on Job Satisfaction and Its Related Variables of Forest Interpreters (숲해설가의 직무만족도와 관련변인에 따른 차이 분석)

  • Son, Ji Won;Ha, Si Yeon
    • Journal of Korean Society of Forest Science
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    • v.103 no.2
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    • pp.270-277
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    • 2014
  • This research analyzed job satisfaction for improvement in job satisfaction of forest interpreters and effective management. Interpreters felt satisfied with their job with a mean satisfaction score 3.41 out of 5 but unsatisfied with pay and job benefits. Job satisfaction showed significant differences in interpreting field, agencies and working period. Results from factor analysis, job satisfaction classified into four factors; team atmosphere, level of compensation, job conflict and working environment. And interpreters more satisfied in team atmosphere and working condition than level of compensation and job conflict. Also this study showed related variables to job satisfaction. Team atmosphere was related with working period and agency, the level of compensation was also related with agency and the working environment is in relation to agency and interpreting field.

Comparison of Three Ergonomic Risk Assessment Methods (OWAS, RULA, and REB A) in Felling and Delimbing Operations (벌도 및 가지제거작업에서 세 가지 인간공학적 위험 평가기법의 비교분석)

  • Cho, Min-Jae;Jeong, Eung-Jin;Oh, Jae-Heun;Han, Sang-Kyun
    • Journal of Korean Society of Forest Science
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    • v.110 no.2
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    • pp.210-216
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    • 2021
  • Musculoskeletal disorders affect workers' safety in most industries, and forest operations are classified as a musculoskeletal burden according to the Occupational Safety and Health Act in South Korea. In particular, felling and delimbing operations are mainly conducted by manpower, and then, it is necessary to evaluate ergonomic risk assessment for safety of felling and delimbing workers. Three ergonomic risk assessment methods, such as Ovako Working posture Analysis System (OWAS), Rapid Upper Limb Assessment (RULA), and Rapid Entire Body Assessment (REBA), are available for assessing exposure to risk factors associated with timber harvesting operations. Here, three ergonomic risk assessment methods were applied to examine ergonomic risk assessments in chainsaw felling and delimbing operations. Additionally, exposure to risk factors in each method was analyzed to propose an optimal working posture in felling and delimbing operations. The risk levels of these operations were evaluated to be highest in the RULA method, followed by the OWAS and REBA methods, and most of the exposed working postures were examined with a low-risk level of two and three without requiring any immediate working posture changes. However, two significant working postures, including the bending posture of the waist and leg in felling operation and standing posture on the fallen trees in delimbing operation, were assessed as the high-risk level and needed immediate working posture changes. Low-risk work levels were examined in the squatting posture for felling operation and the straightened posture of the waist and leg for delimbing operation. Moreover, the slope in felling operation and the tree height in delimbing operation significantly affected risk level assessment of working posture. Therefore, our study supports that felling and delimbing workers must operate with low-risk working postures for safety.

Analysis of work times and postures occurring relating to stone channel work in forest engineering (돌수로공의 작업시간 및 작업자세 분석에 관한 연구)

  • Yeom, In-Hwan;Choi, Yeon-Ho;Kim, Myeong-Jun;Kweon, Hyeong-Keun;Lee, Joon-Woo;Kim, Je-Su;Park, Bum-Jin
    • Korean Journal of Agricultural Science
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    • v.38 no.1
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    • pp.101-108
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    • 2011
  • In forest work, working conditions are very hard to improve. The proper distribution of work time and good posture is believed to bring about direct improvements such as accident prevention. On this, this study has analyzed forest workers' posture and their working hours in order to improve their working conditions in stone channel work. Authors has chosen several core elements of stone channel work to focus on, which include stone masonry, excavation of bed, moving stone, directing work, choosing stone, and breaking stone. The ratio of real working time over total working time was shown as 84.6%. As for the time ratio of each elemental work over the real working time, the stone masonry was 60.4%, the directing work was 15.1%, moving stone was 12.1%, choosing stone was 7.1%, breaking stone was 3.3%, and excavation of bed was 2.0%. According to the analytical results provided by OWAS, the ratio of category III (Work posture has a distinctly harmful effect on the musculoskeletal system) has shown that moving stone turned out 65.2%, choosing stone was 61.5%, stone masonry was 46.1%, breaking stone was 14.3%, excavation of bed was 12.5% and directing work was 6.8%. Furthermore, the ratio of category IV (Work posture with an extremely harmful effect on the musculoskeletal system) has shown that excavation of bed turned out 37.5%, breaking stone was 28.6%, stone masonry was 27.3%, choosing stone was 7.7%, moving stone was 6.1% and directing working was 4.5%. These results are expected to be utilized for the improvement with respect to both working methods in the stone channel work and the workers' working posture.

Performance Analysis of Earth Work Using Excavator in the Case of Forest Road Construction (임도공사시(林道工事時) 굴삭기(掘削機)를 이용(利用)한 토공작업(土工作業)의 공정분석(工程分析))

  • Lee, Joon Woo;Park, Bum-Jin
    • Journal of Korean Society of Forest Science
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    • v.87 no.1
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    • pp.82-89
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    • 1998
  • This study was carried out to investigate working time, performance, and to predict performance that related to the factor of forest road in earth work using excavator. It was found that the real working time was 503 minutes in a day. The ratio of real working time and allowance per total working time was approximately 85.7% and 14.3% individually. The rate of soil movement(Sm) to net working time was 38.6%, and earth cutting(Ec) was 32.5%. According to performance analysis, performance of earth work using excavator($0.8m^3$) in straight part was 1.4 times larger than curve part and rock work using excavator($0.8m^3$) which had breaker in straight was 9.1 times larger than earth work using excavator($0.8m^3$) which had bucket. Performance of earth work using excavator($1.0m^3$) was 1.3 times larger than using excavator($0.8m^3$) in straight and curve part. Working performance in earth work using excavator($0.8m^3$) was influenced by the conditions of radius of curve, width of roadway, slope gradient. It is not influenced by diameter and number of root stock.

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Studies on Working Intensity in Felling Operation of the Thinning Forest -In Thinning of Some Conifer Species- (벌채작업(伐採作業)에서의 작업강도(作業强度) 측정연구(測定硏究) -침엽수(針葉樹) 간벌림에(間伐林)서-)

  • Park, Soo-Kyoo;Kang, Gun-Uh
    • Journal of Korean Society of Forest Science
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    • v.85 no.3
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    • pp.396-408
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    • 1996
  • The purposes of this study were to standardise the forest working system to design the intensity of working system in felling operation of the thinning forest in our country as well as to contrive the improvement of working method and the increase of productivity. For the purpose of investigating these, element working was classified by felling operation in softwood thinning forest, and a pulse rate were measured and analyzed. The results were as follow : 1. From the analysis of the pulse frequence measurment, the average pulse showed 108 pulse per minute for worker A in the total of pure working time, 130 pulse per minutes for worker B, 119 pulse per minute for worker C and 125 pulse per minute for worker D, respectively. 2. From the results of the pulse frequence analysis according to element working classification, the highest pulse frequence represented 115 pulse per minute for worker A in the circumference, 131 pulse per minute for worker B in the movement, 122 pulse per minute for worker C in the limbing operation and 128 pulse per minute for work D in hang-up. 3. If the original pulse frequence was 100% for workers, the working intensity showed as follow : worker A was 160%(original pulse frequence was 61=100%) for the total of the working intensity and 188% for the circumference among element working. Worker B was 220%(original pulse frequence was 57=100%) for the total of the working intensity and 229 for movement among element working. Worker C was 159%(original pulse frequence was 73=100%) for the total of the working intensity and 168% for limbing operation among the element working. Worker D was 156%(original pulse frequence was 70=100%) for the total of working intensity and 182% for hang-up among element working. 4. At the limit point of Labor performance rating, showing the total of working intensity, overtime pulse rate per minute was 30 for worker A, 207 for worker B, 14 for worker C and 67 for worker D. Worker B was highest in working intensity, and got physically a big load.

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Analysis of working posture of forest trail construction (숲길 조성공사 작업자의 작업자세 분석에 관한 연구)

  • Lee, Myeong-Kyo;Park, Bum-Jin;Lee, Joon-Woo;Choi, Sung-Min
    • Korean Journal of Agricultural Science
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    • v.42 no.2
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    • pp.117-124
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    • 2015
  • In forest work, working conditions are very hard to improve. The good posture is believed to bring about direct improvements such as accident prevention. Therefore, this research carried on analysis of working posture in forest work (construct in stepping-stone) using OWAS analysis system. According to the analytical results provided by OWAS, the ratio of category III (Work posture has a distinctly harmful effect on the musculoskeletal system) has shawn that worker 2 was 32.2%, worker 1 was 25.2% and worker 3 was 15.5%. Furthermore, the ratio of category IV (Work posture with an extremely harmful effect on the musculoskeletal system) has shown that worker 2 was 9.8%, worker 3 was 1.4% and worker 1 was 1.2%. According to the OWAS method, percentage of OWAS action categories III and IV in the worker 2 was higher than another workers.

Postural Risk Assessment of Weed and Kudzu Removal Operations (숲가꾸기를 위한 풀베기와 칡덩굴제거작업의 근골격계 부담 분석)

  • Lee, Eunjai;Baek, Seung-An;Cho, Koo-Hyun
    • Journal of Korean Society of Forest Science
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    • v.109 no.2
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    • pp.195-201
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    • 2020
  • A forest operation is considered as one of the riskiest environments for the development of musculoskeletal disorders because operators are exposed to harmful environmental conditions such as rough terrain, inclement weather, and poor working postures. In weed and kudzu removal operations, manual application is still common in Korea. In this study, we evaluated the ergonomic conditions of weed and kudzu removal in regeneration forests and the associated risk of musculoskeletal disorders. The risk of musculoskeletal disorders was evaluated using the Ovako Working Posture Analysis System and postural risk index. Postural risk was significantly higher for kudzu compared with weed removal operations. This suggests that kudzu removal operations must be improved to decrease postural risk.

A Study on the Job Satisfaction and Turnover of the Forest Workers (산림노동자의 직무만족과 이직에 관한 연구)

  • Kim, Ki Dong;Jung, Byung Heon;Kim, Chul Sang;Lee, Jae Hyoun
    • Journal of Korean Society of Forest Science
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    • v.98 no.6
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    • pp.690-695
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    • 2009
  • The purpose of this research is to revealed the relationship between job satisfaction and turnover of forest workers. Data had obtained through a questionnaire, in which 155 forest workers at three national forestry cooperative federation training centers are questioned. The data had been analyzed using the factor analysis and multiple regression method. The results of the factor analysis were found 'Relation with the boss', 'Wage & safety', 'relation with co-workers', 'Job specifications', and 'Working hours'. As the result of the regression, turnover was affected by only 'Job specification', however turnover was not affected by 'Relation of the boss', 'Wage & safety', 'relation of co-workers', and 'Working hours'.