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Efficacy and profitability of a mobile grinder system for biomass production in Korea
권형근,이학준,이준우,최성민 한국산림과학회 2016 Forest Science And Technology Vol.12 No.4
Forest biomass utilization is increasing in Korea, but on-site biomass operations have not been studied much. This study investigates the efficacy and profitability of a mobile grinder system that consists of a mobile tub-grinder, a grapple excavator, and a three-man crew. A time study was carried out to measure production time and to calculate the productivity of the system. The mobile grinder system ran 3 work cycles a day for total of 347.5 minutes. It was only productive for less than half of the 8 working hours a day (237.4 minutes, utilization rate of 49.4%). We estimated that the system produced 246.2 m3/day, which was 26% lower than the daily capacity reported by the grinder operators. This study found the system could make utilizing forest biomass profitable, although this depended on limited market information. The profitability of the system can be improved by increasing work cycles a day and decreasing organizational delays by better operation management. More research is needed to increase the on-site productivity of the system, and incorporate it and the actual price of wood chips to further assess the profitability of the system. The study results can be used as a justification for the grinder system, encouraging forest managers to adapt this relatively new operation.
권형근,서정일,이준우 한국산림과학회 2019 한국산림과학회지 Vol.108 No.1
This study was conducted to evaluate the effect of the synthetic forest road network by calculating the optimal road density and layout of the forest road network in order to construct the systematic road network in the forested area. For this, five comparative routes were additionally planed and compared through evaluation indicators. As a result, the optimum road density of the study site was estimated to be 18.4 m/ha, and the synthetic forest road network was the best in the four indicators such as average skidding distance, standard deviation of skidding distance, development index, and circuity factor. In addition, the synthetic forest road network was comparable to the main road network by about 4 %p in the timber volume available and potential area size for logging, but the construction cost of the road was about 20 %p lower. It showed a synthetic forest road network was better in terms of economy. 이 연구는 체계적인 임내도로망의 구축을 위해 고규격 및 저규격의 임도를 포함하는 적정임도밀도를 산정한 후, 이를 토대로 구축한 복합임도망의 배치 효과를 5개의 비교임도망과 비교ㆍ평가하였다. 그 결과, 연구대상지의 적정임도밀 도는 약 18.4 m/ha로 산정되었으며, 평균집재거리, 집재거리표준편차, 개발지수, 임도 우회계수 등의 지표에서 복합임도망 이 가장 양호한 것으로 나타났다. 또한, 집재가능재적량과 집재가능면적에서 복합임도망은 간선임도망에 비해 약 4 %p 수 준으로 비슷하게 나타났지만, 임도개설비용은 약 20 %p가 낮게 나타나 경제적 측면에서도 양호한 것으로 나타났다.
작업임도 조성사업의 설계‧감리제도 개선방안에 관한 연구
권형근,최성민,이학준,지병윤,이준우 한국산림공학회 2015 산림공학기술 Vol.13 No.2
본 연구는 작업임도 조성사업에 있어서 설계와 감리제도의 문제점을 조사하고 그 개선방안을 제시하고자 실시하였다. 이를 위해 작업임도의 설계‧감리제도에 대한 전문가집단 설문조사를 실시한 결과는 다음과 같다. 작업임도 설계비의 산정방식에 대한 변경이 필요하다는 의견이 전체의 약 80%에 달하였다. 작업임도 설계비의 적정 산정방식은 현행의 공사비요율방식에 할 증이 필요하다는 의견이 약 50%, 실비정액가산방식이 더 적합하다는 의견이 약 38%로 나타났다. 작업임도 설계비의 할증요소에는 작업량(시공거리)이 39.2%, 산지경사 36.7%, 하층식생 10.0% 등 으로 순으로 의견이 나타났다. 또한, 작업임도 감리비의 산정방식에서도 변경이 필요하다는 의견이 전체 응답자의 약 70%였으며, 특히 직접 감리를 시행하고 있는 산림조합·기술사사무소 직원의 경우 약 90%가 현행 방식을 변경해야 한다는 의견을 개진하였다. 작업임도 감리비에 대한 적정 산정방식은 현행의 공사비요율방식에 추가 경비를 할증하자는 의견이 약 56%, 실비정액가산방식이 더 적합하다는 의견이 약 40%로 나타났다. 또한 작업임도 감리비의 할증요소에는 작업량 33.3%, 감리횟수 33.3%, 감리기간 18.6%, 이동거리 9.8% 등으로 나타났다. 이를 바탕으로 작업임도의 설계 및 감리사업에 대한 개선방안을 제시하였다. This study was conducted to investigate the problems of a design and supervision system for constructing spur roads in forests, and to find how to improve the system. A survey was conducted among professional groups that used the design and supervision system. The results showed that 80% of the survey participants felt the need to improve the method for determining the designing cost of spur roads, which used a predetermined rate based on the total construction cost. For the future method, 50% said charging an extra fee in addition to the current predetermined rate; and 38% said setting up a certain amount regardless of the total construction cost. The elements that need extra fee are the amount of work (i.e., constructing road distance) (39.2%), slope steepness (36.7%), and understory vegetation (10.0%). Also, 70% of the survey participants said changing the method for determining the supervising cost of spur roads, which used a predetermined rate based on the total construction cost. Especially, 90% of the Forestry Cooperative Federation and Forestry Professional Engineer personnels said so. For the future method, 56% said charging an extra fee in addition to the current predetermined rate; and 40% said setting up a certain amount regardless of the total construction cost. The elements that need extra fee are the amount of work (33.3%), number of supervisions (33.3%), duration of supervisions (18.6%), and distance from the supervisor’s office (9.8%).
로드킬의 발생현황과 원인조사를 통한 야생동물 치사감소방안에 대한 연구- 대전~서산 구간을 중심으로 -
권형근,최윤호,김명준,이준우 강원대학교 산림과학연구소 2008 Journal of Forest Science Vol.24 No.2
본 연구에서 충청남도의 국도 121 km를 대상으로 로드킬 현황조사를6회에 걸쳐 실시한 결과 총94개체가 발견되었다.그리고 도로의 구조에 따른 로드킬 발생현황은2차선 44회(1.13회/km), 3차선 1회(1.90회/km), 4차선 23회(0.35회/km)로 나타났다. 또한, 도로의 토지이용에 따른 로드킬 발생은 산지와 농경지의 경우 26회, 농경지와 농경지의 경우 25회, 산지와 산지의 경우 20회 등으로 나타났다. 아울러 야생동물의 로드킬을 방지하기 위해서는 도로의 구조 및 시설물 등에 대해 세심한 배려가 필요하다. This study conducted 6 times of roadkill investigations in national road 121 km (about 10%) of Chungcheongnam-do. As a result of the investigation, 94 individuals were found dead on the road. The roadkill statuses by construction of road were 44 times (1.13 times/km) at two traffic lanes, 1 time (1.90 times/km) at three lanes, and 23 times (0.35 times/km) at four traffic lanes. Also, land use on the frequency of roadkill were 26 times between mountain region and cultivated land, 25 times between cultivated land and cultivated land, and 20 times between mountain region and mountain region. So, particular attention is needed at the construction and facilities of road to reduce roadkill.