• Title, Summary, Keyword: Logging operation system

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Analysis of Policy and Status of the Logging Operation System for Forest Biomass (산림바이오매스 이용을 위한 임목수확작업시스템의 현황 및 정책 분석)

  • Park, Sang-Jun
    • Journal of Environmental Science International
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    • v.29 no.2
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    • pp.155-166
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    • 2020
  • This study was conducted to analyze the current situation of the logging operation system and to suggest an effective policy plan to secure important raw materials for the use of forest biomass. The dissemination of forestry mechanization and the establishment of the logging operation are important tasks to establish a system and reduce costs of timber production by increasing the use of forest biomass; this includes increasing the supply of timber for domestic products and increasing the production of wood chips and wood pellets. In particular, the efficiency of steep-slopes catenary system machinery for yarding such as tower-yarder and swing-yarder should be urgently supplied to cope with forest production and supply of forest biomass energy resources. In addition, it is necessary to continuously promote the dissemination of high-performance forestry machinery as is being done in Japan. At the same time, instead of distributing or retaining the spread of forestry machinery to the state and local governments, it is necessary to distribute timber production work centered on forest cooperatives or private timber producers to be carried out by wood producers, forest cooperatives and individuals.

Analyzing the Comparative Economic Efficiency of Short-wood Woodgrab Logging and Whole-tree Cable Logging Operations (Woodgrab을 이용한 단목집재와 가선집재방식에 의한 전목집재의 경제적 효율성 비교분석)

  • Seol, Ara;Han, Hee;Jung, Yoonkoo;Chung, Hyejean;Chung, Joosang
    • Journal of Korean Society of Forest Science
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    • v.105 no.2
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    • pp.231-237
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    • 2016
  • This research was conducted in order to examine whether the Woodgrab short-wood logging method, most widely used logging method in Korea, is more favorable than other logging methods in terms of productivity and profitability. For the comparative purposes, whole-tree logging methods with cable yarding system using a swing yarder and a tower yarder were evaluated. The productivity and the profitability of the logging operations by the machine types on a L. kaempferi stand were estimated by simulating logging processes based on bucking patterns and the results were compared. As a result, the Woodgrab short-wood logging system showed the most favorable results in terms of skidding productivity and operating cost. On the contrary, the system was the least profitable among the three logging methods. Main reason is that while the system may be beneficial in terms of operation productivity, it is restricted to produce only short logs mainly for low quality raw materials such as pulp, bolts, etc. which are sold at cheap prices.

An Analysis of the Operational Productivity and Cost for the Utilization of Forest-biomass(II) - the Analysis of Operational Cost - (산림바이오매스 이용을 위한 산림작업 공정 및 비용 분석(II) - 작업비용 분석 -)

  • Mun, Ho-Seong;Cho, Koo-Hyun;Park, Sang-Jun
    • Journal of Korean Society of Forest Science
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    • v.104 no.2
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    • pp.230-238
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    • 2015
  • This study was analyzed the operational cost of logging and chipping operations in order to develop the efficient logging operation system for the utilization of forest-biomass. Analysis of the operational cost of logging operation systems, the operation system D which include chain saw, tower-yarder, mini-forwarder and truck was calculated the lowest cost to be $68,498Won/m^3$. In the utilization of forest-biomass, the operation system E which include chipping by mini-chipper at the site, forwarding of chips by mini-forwarder, transportation of chips by truck was estimated to be 90,770 Won/Ton. Thus, These results are determined as an effective operating system for logging operation and the utilization of forest-biomass.

A Study on Analyzing the Live Skyline Cable Logging Mechanics (유동식 가선집재시스템 Live Skyline의 역학분석에 관한 연구)

  • Chung, Joo Sang;Chung, Woo Dam
    • Journal of Korean Society of Forest Science
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    • v.83 no.3
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    • pp.357-364
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    • 1994
  • In this paper, the characteristics of cable logging systems, of which skyline length is adjustable during operation are discussed from a standpoint of system geometry. Among the cable logging systems, the live skyline is the typical one, of which operation is easy to understand. To analyze the cable logging mechanics of the live skyline, computer models were developed. In developing the computer models, the concept of the live skyline operation was classified into 'true live skyline' and 'live skyline with lift'. The former assumes to adjust skyline length continuously to maintain the skyline clearance over ground constant during inhaul ; the latter assumes to shorten the skyline length only to keep the minimum skyline clearance during inhaul. The computer model was used in investigating the mechanical efficiency and the operational characteristics of the live skyline system. First, the payload capability of live skyline was compared with that of standing skyline. Second, the effect of the change in the log-drag geometry on the payload capability of live skyline was investigated. Finally, the payload capability of live skyline with lift was compared with that of true live skyline as an effort to explain the concepts of true live skyline and live skyline with lift.

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A Case Study on the Application of HiTRONIC-II Electronic Detonators to Overseas Site (HiTRONIC-II 전자뇌관 해외현장 적용 기술사례)

  • Lee, Dong-Hee;Jeong, Min-Su;Hwang, Nam-sun;Kim, Tae-hyun
    • Explosives and Blasting
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    • v.37 no.3
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    • pp.34-42
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    • 2019
  • An electronic initiation system that can support various types of field blasting works has been developed and put into practice. The newly developed equipment called Hanwha Electronic Blasting System (HEBS) II has three basic operation modes of scanning, logging, and tagging, among which the blaster can choose the most suitable one for the specific site conditions. In the present study, the work efficiency of the system in the scanning, logging and tagging modes was compared with that of the previous non-electric detonator. The results were estimated based on the aspects of the ground vibration, fragmentation, and digging time. It was found that the ground vibration, fragmentation, and digging time of the new system were decreased by about 45%, 31%, and 13%, respectively, with respect to the previous system. This result confirms that the new system is very efficient in the scanning, logging and tagging modes under the field conditions.

A Recovery Technique Using Client-based Logging in Client/Server Environment

  • Park, Yong-Mun;Lee, Chan-Seob;Kim, Dong-Hyuk;Park, Eui-In
    • Proceedings of the IEEK Conference
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    • pp.429-432
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    • 2002
  • The existing recovery technique using the logging technique in the client/sewer database system only administers the log as a whole in a server. This contains the logging record transmission cost on the transaction that is executed in each client potentially and increases network traffic. In this paper, the logging technique for redo-only log is suggested, which removes the redundant before-image and supports the client-based logging to eliminate the transmission cost of the logging record. Also, in case of a client crash, redo recovery through a backward client analysis log is performed in a self-recovering way. In case of a server crash, the after-image of the pages which needs recovery through simultaneous backward analysis log is only transmitted and redo recovery is done through the received after-image and backward analysis log. Also, we select the comparing model to estimate the performance about the proposed recovery technique. And we analyzed the redo and recovery time about the change of the number of client and the rate of updating operation.

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Application of GIS for Selection of Logging Operation Machine (벌출작업 기종의 선정을 위한 GIS 활용)

  • Jeon, Kwon-Seok;Ma, Ho-Seop
    • Journal of the Korean Association of Geographic Information Studies
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    • v.6 no.1
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    • pp.85-97
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    • 2003
  • This study was aimed at suggest a proper logging method of mountain forest using geographic information system(GIS) based on digital terrain model(DTM) in the National Forest at Mt. Kumsan in Namhae-gun, Gyungsangnam-do, which has about 2,948 ha in area. The areal percentage of 201 to 250m in the elevation was about 15.5%, elevation of 251 to 300m was 14.5%, and 78.75% for higher than 400m. The accumulated areal percentage of below 30% in the gradient was 17.2%, and 81.0% for steeper than 60%. The area for tractor skidding was 17.2%(511.7ha), the area for tractor attached winch skidding was 63.8%(1,896.3ha) and 18.4%(545.5ha) for cable yarding. It is important to choose the proper logging machines for timber harvesting. In general, the selection of logging operation system was affected several major environmental factors like as terrain conditions(slope gradient, slope length) and stand factors. The rate of middle slope gradients in terrain conditions showed higher than that of steep slope gradients in this area. Therefore, it considered that the logging operation system in this area could apply to tractor+winch operating machine according to terrain conditions.

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Harvesting Cost and Productive of Tree-Length Thinning in a Pinus densiflora Stand Using the Tower Yarder (HAM300)

  • Cho, Minjae;Cho, Koohyun;Jeong, Eungjin;Lee, Jun;Choi, Byoungkoo;Han, Sangkyun;Cha, Dusong
    • Journal of Forest and Environmental Science
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    • v.32 no.2
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    • pp.189-195
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    • 2016
  • Logging equipment and method have a major influence on harvesting productivity and cost. This study investigated the productivity and operational costs of tree-length cable yarding system using HAM300, a domestically developed tower yarder. We tested HAM300 for thinning operation in Pinus densiflora stands at Gangreung, Gangwon-do on April, 2014. To assess the productivity we conducted time study for each stage of the operation. When the average time/cycle was examined for each stage of the operation, the longest was for yarding (241 sec), followed by delimbing (237 sec), felling (153 sec), and processing (103 sec). Furthermore, productivity for felling was $8.6m^3/hr$, followed by delimbing ($5.1m^3/hr$), yarding ($3.5m^3/hr$), and processing ($8.1m^3/hr$). The total cost for the tree-length logging system was $58,446won/m^3$, of which the majority was incurred by the yarding cost at $46,217won/m^3$ (79.3%), whereas the lowest cost was for felling at $2,359won/m^3$ (4.1%). We suggest that it is necessary to foster specialized operators and provide training in operating the tower yarder thereby implementing efficient harvesting system resulting from low-cost yarding.

A Study on the Forestry Safety Helmet Development Based on IoT (IoT 기반 임업용 안전모 개발에 관한 연구)

  • Nam, Ki-Hun;Park, Jung-Kyu
    • Journal of the Korean Society of Industry Convergence
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    • v.23 no.3
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    • pp.419-425
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    • 2020
  • There are many accident risks in logging operation of forestry such as struck by felled trees and caught in, under, or between felled trees. These accidents are primarily occurred by not keeping a safe distance between workers. According to the forestry safety instruction, workers are not supposed to go into the safety zone which is a circle with a radius of more 2 times the height of felling tree. However, this rule does not keep because of poor safety consciousness, poor sight and extreme noise of logging operation machines. This problem causes many major accidents every year. To solve this problem, we made forestry safety helmets based on IoT technology. These helmets have functions to make a visual and an acoustic alarm signal when reach the distance between workers within 20 meters. We developed the algorithm to operate the helmet's functions and conducted tests to check the functions. As a result of tests, we assured the normal system operating conditions.

SCADA System for Semiconductor Equipment Condition Monitoring (반도체 장비상태 모니터링을 위한 SCADA 시스템 구현)

  • Lee, Youn Ji;Yun, Hak Jae;Park, Hyoeun;Hong, Sang Jeen
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.4
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    • pp.92-95
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    • 2019
  • Automation control and the data for control of industrial equipment for the diagnosis and prediction is a key to success in the 4th industrial revolution. It increases process efficiency and productivity through data collection, realtime monitoring, and the data analysis. However, university and research environment are still suffering from logging the data in manual way, and we occasionally loss the equipment data logging due to the lack of automatic data logging system. State variable presents the current condition of the equipment operation which is closely related to process result, and it is valuable to monitor and analyze the data for the equipment health monitoring. In this paper, we demonstrate the collection of equipment state variable data via programmable logic controller (PLC) and the visualization of the collected data over the Web access supervisory control and data acquisition (SCADA). Test vehicle for the implementation of the suggested SCADA system is a relay switched physical vapor deposition system in the university environment.

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