Updated on 2021/05/28

写真a

 
Oka Masaru
 
Organization
Research Field in Agriculture, Agriculture, Fisheries and Veterinary Medicine Area Faculty of Agriculture University Forests Professor
Title
Professor

Degree

  • 博士(農学) ( 2007.3   東京大学 )

Research Interests

  • 残存木損傷

  • 高性能林業機械

  • 作業システム

  • コスト

  • 作業効率

  • 生産

  • 伐出

Research History

  • Kagoshima University   Professor

    1949.4

Professional Memberships

  • 森林利用学会(理事)

    2015.10

  • 日本森林学会

    2015.10

Committee Memberships

  • 森林環境保全直接支援事業工程分析調査事業検討委員会(林野庁委託)   委員  

    2014.7 - 2016.2   

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    Committee type:Other

 

Papers

  • Yoshihito Iuchi, Masaru Oka*, Yukiyoshi Teramoto , Etsuro Simokawa and Eiji Inoue *Corresponding author .  Statistical analysis of cross drainage ditch along spur roads in the Shirasu area, southern Kyushu, Japan .  Journal of the Japan Forest Engineering Society36 ( 2 ) 87 - 97   2021.4Statistical analysis of cross drainage ditch along spur roads in the Shirasu area, southern Kyushu, JapanReviewed

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    Authorship:Corresponding author   Language:Japanese  

  • Yoshihito Iuchi, Masaru Oka*, Yukiyoshi Teramoto and Etsuro Simokawa *Corresponding author .  An actual analysis of super road maintenance in the Shirasu area, Southern Kyushu .  Journal of the Japan Forest Engineering Society35 ( 2 ) 87 - 96   2020.4An actual analysis of super road maintenance in the Shirasu area, Southern KyushuReviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the Japan Forest Engineering Society  

  • Makino Kosuke, Oka Masaru, Kajisa Tsuyoshi, Teramoto Yukiyoshi, Shiba Masami, Nakajima Toru, Nagahama Takayuki .  Calculation of the stem-curve equation of sugi(<i>Cryputomeria japonica</i>)an d analysis of timber quality in the Osumi area of Kagoshima Prefecture::A case study of the Kagoshima University Takakuma Experimental Forest .  Japanese Journal of Forest Planning53 ( 2 ) 53 - 62   2020

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    Publisher:Japan Society of Forest Planning  

    <p>Kosuke Makino, Masaru Oka, Tsuyoshi Kajisa, Yukiyoshi Teramoto, Masami Shiba, Toru Nakajima and Takayuki Nagahama: <b>Calculation of the stem-curve equation of sugi(<i>Cryputomeria japonica </i>)and analysis of timber quality in the Osumi area of Kagoshima Prefecture: A case study of the Kagoshima University Takakuma Experimental Forest. Jpn. J. For. Plann. 53: 53~62, 2020</b> At tree-harvesting sites, grading logs are generally made from trees. To maximize the profitability of log operations, wood conversion, which determines the quality grade of logs and timber-yield percentage, largely depends on the adherence to appropriate procedures by forest workers. In this study, we collected data on logs at a production site in real time and assessed their potential applications. Stem-curve equations were developed by measuring trimming length, log length, top end length, and the cutting diameter of each end when the lumber was ready for processing. Next, we analyzed the shape of fallen trees and estimated the timber-yield percentage and quality grade. The timber-yield percentage of cedar wood was consistent with previously documented values in the Osumi area. Furthermore, when the frequency of the quality class was analyzed using the shape ratio as an index, a correlation between the B and C-grade logs and the shape ratio was revealed; however, there was no significant correlation between the shape ratio and A-grade logs.</p>

    DOI: 10.20659/jjfp.53.2_53

  • Iuchi Yoshihito, Oka Masaru, Teramoto Yukiyoshi, Shimokawa Eturo .  An actual analysis of super road maintenance in the Shirasu area, Southern Kyushu, Japan. .  Journal of The Japan Forest Engineering Society35 ( 2 )   2020

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    Publisher:The Japan Forest Engineering Society  

    <p>We conducted actual analyses of the maintenance of 98 spur roads running of a medium truck in the Shirasu area(formed from the pyroclastic flow deposits from Aira Caldera) of Southern Kyushu. Most of the spur roads in the study had been established for 4-6 years. Eighty percent of the maintenance of sites was required due to clearing and grubbing and non-land correction of trucks and for concretization of the road surface and granular filling of the roadbed. About 90% of maintenance costs were due to concretization of the road surfaces and granular fill used for the roadbed. Costs increased as the number of years after the establishment of the roads increased. After 16 years, the total cost of maintenance of the spur roads is expected to be > 25% of their establishment costs.</p>

    DOI: 10.18945/jjfes.35.87

  • Komei Suzuki1, Satoshi Tatsuhara1, Tohru Nakajima1, Hidesato Kanomata, Masaru Oka .  Predicting Effects of Logging Systems and Bucking Strategies for Privately Owned Sugi (Cryptomeria japonica) Plantations in Atsumi District, Tsuruoka City, Yamagata Prefecture .  Journal of Forest Planning24 ( 2 ) 15 - 27   2019.1Predicting Effects of Logging Systems and Bucking Strategies for Privately Owned Sugi (Cryptomeria japonica) Plantations in Atsumi District, Tsuruoka City, Yamagata PrefectureReviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Forest Planning  

  • Koumei Suzuki,Satoshi Tatsuhara,Tohru Nakajima,Hidesato Kanomata,Masaru Oka .  Effects of management strategies on profits from sugi (Cryputomeria japonica) platations :Case studies of private forests in Atsumi District, Tsuruoka City, Yamagata Prefecture .  Journal of Forest Planning58 ( 2 ) 69 - 79   2018.4Effects of management strategies on profits from sugi (Cryputomeria japonica) platations :Case studies of private forests in Atsumi District, Tsuruoka City, Yamagata PrefectureReviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Forest Planning  

  • Nakajima Tohru, Shiraishi Norihiko, Tatsuhara Satoshi, Kanomata Hidesato, Hiroshima Takuya, Mitsuda Yasushi, Oka Masaru, Matsumoto Mitsuo .  Evaluation of biomass supply volume based on the possibility of harvesting in 47 prefectures in Japan .  The Japanese Forest Society Congress129 ( 0 )   2018Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:THE JAPANESE FORESTRY SOCIETY  

    <p>[in Japanese]</p>

    DOI: 10.11519/jfsc.129.0_804

  • Suzuki Komei, Tatsuhara Satoshi, Nakajima Tohru, Kanomata Hidesato, Oka Masaru .  Effects of logging systems and bucking strategies on profits from sugi (<i>Cryptomeria japonica</i>) plantations:Case studies of private forests in Atsumi District, Tsuruoka City, Yamagata Prefecture .  Japanese Journal of Forest Planning51 ( 2 ) 69 - 79   2018

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    Publisher:Japan Society of Forest Planning  

    <p>To assess potential increases in profitability of privately owned sugi (<i>Cryptomeria japonica</i>) plantations in Atsumi District, Tsuruoka City, Yamagata Prefecture, Japan, we simulated effects of two strategies. One was a traditional strategy involving use of a logging system with cable yarders to intend to produce high-price logs, and the other was an efficient strategy involving use of a logging system with high-performance forestry machines to mass-produce regular logs. We calculated forest rent per ha per year for each strategy by site class and cutting age, changing the maximal height where A-grade logs could be bucked and the ratio of numbers of crooked trees to total trees. The efficient strategy resulted in higher forest rents per year than the traditional strategy in almost all cases, showing that it was usually more profitable,despite standardizing the bucking to produce regular A-grade logs. The findings suggest that changing from a traditional management strategy to an efficient strategy with a high-density forest road network and highperformance forestry machines should increase the profitability of sugi plantations at hypothetical stand level.</p>

    DOI: 10.20659/jjfp.51.2_69

  • KANOMATA HIDESATO, Nakajima Tohru, Oka Masaru .  Development of estimation formula for the logging cost assuming utilization by GIS .  The Japanese Forest Society Congress129 ( 0 )   2018

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    Publisher:THE JAPANESE FORESTRY SOCIETY  

    <p>[in Japanese]</p>

    DOI: 10.11519/jfsc.129.0_68

  • Yukiyoshi Teramoto,Etsuro Shimokawa and Masaru Oka .  Sediment Yields Related to Erosion and Collapse in the Takakuma Experimental Forest at Kagoshima University after Heavy Rainfall in September 2016 .  Journal of Rainwater Catchment Systems23 ( 1 ) 59 - 65   2017.7Sediment Yields Related to Erosion and Collapse in the Takakuma Experimental Forest at Kagoshima University after Heavy Rainfall in September 2016Reviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Rainwater Catchment Systems Association  

  • Teramoto Yukiyoshi, Shimokawa Etsuro, Oka Masaru .  Sediment Yields Related to Erosion and Collapse in the Takakuma Experimental Forest at Kagoshima University after Heavy Rainfall in September 2016 .  Journal of Rainwater Catchment Systems23 ( 1 ) 59 - 65   2017

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    Publisher:Japan Rainwater Catchment Systems Association  

    <p>  The Takakuma Experimental Forest at Kagoshima University experienced record rainfall in September 2016. Following this event, we investigated sediment yields related to various types of erosion and collapse along forest roads and slopes within this forest. In particular, we focused on a 6.8-km<sup>2</sup> study area. To evaluate the effect of rainfall intensity on erosion and collapse, we compared results from September 2016 (when maximum hourly rainfall was 154 mm.) with those from September 2005 (when maximum hourly rainfall was 55 mm). The numbers of forest roads and natural slopes damaged by erosion and collapse in September 2016 were greater than in September 2005. Moreover, when erosion and collapse were of the same type, sediment yields recorded in September 2016 were between 1.4 and 11.5 times greater than in September 2005. Thus, total sediment yield in September 2016 was about 3.1 times greater than in September 2005. Our results suggest that both frequency and magnitude of erosion and collapse are correlated with rainfall intensity in this area. </p>

    DOI: 10.7132/jrcsa.23_1_59

  • OKA Masaru .  2. Technical Issues in the Continuous Operation of Logging and Reforestation (Joint Symposium held by the Japanese Forest Economic Society, the Japanese Society of Forest Planning, the Japanese Forest Society, the Japan Forest Engineering Society, and the Ecological Society of Japan: Reflections on Final Harvesting) .  FOREST ECONOMY70 ( 8 ) 13 - 14   2017

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    Publisher:FOREST ECONOMIC RESEARCH INSTITUTE  

    DOI: 10.19013/rinrin.70.8_13

  • Hirokazu YAMAGUCHI, Masaru OKA, Jun KASHIMA, Masahiro MOZUNA, Masaki JINKAWA and Yoshihiro KARIYA .  Application of a learning model to a forest machinery work and analysis of progress in a machine operation technique. .  Journal of The Japan Forest Engineering Society31 ( 4 ) 155 - 162   2016.10Application of a learning model to a forest machinery work and analysis of progress in a machine operation technique.Reviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Forest Engineering Society  

  • Yamaguchi Hirokazu, Oka Masaru, Kashima Jun, Mozuna Masahiro, Jinkawa Masaki, Kariya Yoshihiro .  Application of a learning model to a forest machinery work and analysis of progress in a machine operation technique .  Journal of The Japan Forest Engineering Society31 ( 4 )   2016Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Forest Engineering Society  

    <p>We observed changes in the productivity of log-loading work using a grapple loader and determined how an operator can gain proficiency in operating forest machines by evaluating the subsequent machine work of the operators who were inexperienced in forest machine operations. Consequently, we found that the work time tended to decrease with an increase in the work experience of the operator. This could be because of the improvement in machine operation techniques such as simultaneous operation of actuators or effective uses of machine abilities and the acquisition of work knowledge regarding log treatment or efficient trajectory of the work machine. This consistent decrease in work time and improvement in productivity can be expressed using a log-linear learning model, with a determination coefficient of >0.90 in regression analysis. This showed that an operator's long-term improvement in forest machine operation can be predicted by observing the early progress of the operator. In addition, we revealed that observation of the work should be performed at least five times to complete an exact model.</p>

    DOI: 10.18945/jjfes.31.155

  • Okuyama Yoichiro, Oka Masaru, Inokura Yoji, Ashihara Seichi, Makino Kosuke .  University Forest as a base of cooperative with the region: a case of Kagoshima University Forest .  The Japanese Forest Society Congress127 ( 0 )   2016Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:THE JAPANESE FORESTRY SOCIETY  

    [in Japanese]

    DOI: 10.11519/jfsc.127.0_670

  • IUCHI Yoshihito, OKA Masaru, TERAMOTO Yukiyoshi .  The present conditions and factor analysis of the forest road institution disaster in Amami Oshima .  Journal of The Japan Forest Engineering Society31 ( 1 ) 45 - 54   2016Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Forest Engineering Society  

    Forest roads have been constructed on Amami Islands since 1960 by the Kagoshima prefectural government and they have been damaged because of heavy rains. The latest damage of the forest roads was caused by the record rainfall received in October 2010. We collected data on the serious damages of forest roads because of heavy rains on and after 1975 including the damages in October 2010 and analyzed their data. The results are as follows: 1) More than 80 % of the serious damages of forest roads are due to the collapse of cut slope. 2) The frequency of forest road damages in each route decreased the year when a route of forest road was established and is at a low level after around 1995. This may be because of the change in planning and designing in 1995. 3) Analyzation by a mathematical quantification theory class 1 showed that an amount of collapsed mass relates geological and geomorphological conditions of the road route such as catchment area, slope shape, and longitudinal gradient.

    DOI: 10.18945/jjfes.KJ00010223635

  • 寺本行芳、岡勝、下川悦郎、金錫宇、金槿雨 .  熊本県の再造林放棄地における作業道の侵食・崩壊の形態と生産土砂量の経年変化 .  日本雨水資源化システム学会20 ( 2 ) 67 - 74   2015.2熊本県の再造林放棄地における作業道の侵食・崩壊の形態と生産土砂量の経年変化Reviewed

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  • 山口浩和、岡勝、鹿島潤、加利屋義弘、清水直喜、毛綱昌弘、田中良明、上村巧 .  グラップルローダを用いた丸太積み込み作業における熟練オペレータによる機械作業の特徴 .  森林利用学会誌30 ( 1 ) 17 - 28   2015.1グラップルローダを用いた丸太積み込み作業における熟練オペレータによる機械作業の特徴Reviewed

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  • Teramoto Yukiyoshi, Oka Masaru, Shimokawa Etsuro, Kim Suk-Woo, Chun Kun-Woo .  Temporal Changes in Erosion and Collapse Types and Sediment Yields of Yarding Roads in an Abandoned Clear-cut Plantation Forest, Kumamoto Prefecture, Japan .  Journal of Rainwater Catchment Systems20 ( 2 ) 67 - 74   2015Reviewed

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    <p>  We conducted field investigations to study temporal changes in erosion and collapse types and sediment yields of yarding roads in an abandoned clear-cut plantation forest. The study site in Kumamoto Prefecture, Japan, is 0.89 km<sup>2</sup>, and was clear-cut in September 2002. Moreover, to study sediment yields before replantation was abandoned in the study site, we interpreted aerial photographs taken in 1963, 1968, 1977, 1983, 1988, and 1995. Many of the shallow landslides that occurred on replanted slopes in the study site before replantation was abandoned were smaller than 400 m<sup>2</sup>, and were on slopes with gradients greater than 30 degrees. Sediment yields from these landslides were greater when the tree age was 20 years or less than when the tree age was 20 years or more. The annual average sediment yield/km<sup>2</sup> between September 2002 and 2007 from yarding roads in the abandoned clear-cut forest was~17 times greater than the maximum annual sediment yield/km<sup>2</sup> from shallow landslides on replanted slopes prior to abandonment of replantation. The annual sediment yield/km<sup>2</sup> from September 2007 to 2008 from those yarding roads was~7 % of the annual average yield during that period from yarding roads. The decrease in annual sediment yield/km<sup>2</sup> from the yarding roads was due to washout of slope collapse material from filled slopes toward lower parts of the slopes and an increase in the rate of water infiltration caused by vegetation spread into cuttings in grass tracks for cutting and filling slopes. </p>

    DOI: 10.7132/jrcsa.20_2_67

  • YAMAGUCHI Hirokazu, OKA Masaru, KASHIMA Jun, KARIYA Yoshihiro, SHIMIZU Naoki, MOZUNA Masahiro, TANAKA Yoshiaki, UEMURA Takumi .  Characteristics of a log loading work with a grapple loader performed by a skilled operator(<SPECIAL ISSUE>Tools and machines for logging) .  Journal of The Japan Forest Engineering Society30 ( 1 ) 17 - 28   2015Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Forest Engineering Society  

    In this research, we attempted to clarify the effective machine control technique and working method of an expert worker by analyzing the motion of a grapple loader used in log loading work. In particularly, we focused on the locus of the grapple attachment, and thus installed sensors on each actuator of the knuckle boom for calculating the three-dimensional coordinates of the attachment. The average positioning error was 34.5 mm and the maximum error was 80.2 mm, both of which were considered adequately precise values for our analysis. We then investigated the task of loading 3.49 m^3 of logs on a forwarder carrier, as performed by two operators with different skill levels. As a result, we found that the productivity of work done by the expert was about two times higher than that by the beginner. A close examination of the operations clarified the expert's characteristic technique that contributed to high productivity as follows: 1) the work space was compact, and there was no unnecessary movement; 2) multiple actuators were operated simultaneously, and the attachment was maintained along the most efficient path; 3) the logs were handled stably by being gripped at their center of gravity; and 4) the machine's power was used effectively and continuously during the work. An apparent difference in the operating skills between the beginner and expert has been suggested, and that difference could cause the difference in productivity.

    DOI: 10.18945/jjfes.KJ00009844652

  • Fukumoto Keiko, Teraoka Yukio, Tomoyuki Kinjou, Moriaki Yamashita, Kajisa Tsuyoshi, Ugawa Shin, Ashihara Seiichi, Oka Masaru .  Competition between young cedar (<i>Cryptomeria japonica </i>) and broad-leaved trees at different slope positions in a non-weeded stand in Southern Kyushu .  Japanese Journal of Forest Planning49 ( 1 ) 43 - 49   2015Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Forest Planning  

    <p>The objective of this study was to examine the competition between Japanese cedar (<i>Cryptomeria japonica</i>) and broad-leaved trees at different slope positions in a 5-year-old non-weeded cedar stand in Kagoshima University Forest, Southern Kyushu. We investigated the height growth of planted cedar and broad-leaved trees without weeding treatment stand, and analyzed the species composition and size of broad-leaved trees at different slope positions to compare 5 m strips. We examined the degree of height growth inhibition to compare the affects non-weeding treatment with complete yearly weeding treatment in adjoining even-aged stands. On the upper slope, the height of cedars in the stand without weeding was four-fifths that of cedars in the stand with weeding but was higher than that of broad-leaved trees. In contrast, on the lower slope, broad-leaved trees suppressed cedar height growth in the stand without weeding to 35% of that in the stand with weeding. On the basis of these results, we suggest that weeding in cedar stands can be reduced on upper slopes but is necessary on lower slopes.</p>

    DOI: 10.20659/jjfp.49.1_43

  • 寺本行芳・山本健太郎・岡勝・下川悦郎 .  火山灰・降下軽石被覆斜面の表層崩壊跡地における森林の回復が土壌の発達と浸透能に及ぼす影響 .  日本雨水資源化システム学会20 ( 1 ) 63 - 69   2014.8火山灰・降下軽石被覆斜面の表層崩壊跡地における森林の回復が土壌の発達と浸透能に及ぼす影響Reviewed

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  • 寺本行芳・岡勝・下川悦郎 .  桜島の溶岩上におけるクロマツ林の生長と土壌浸透能 .  日本雨水資源化システム学会20 ( 1 ) 57 - 62   2014.8桜島の溶岩上におけるクロマツ林の生長と土壌浸透能Reviewed

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  • 奥山洋一郎・芦原誠一・岡勝・溝添俊樹 .  木材販売方式変更に伴う収支構成の変化-鹿児島大学農学部附属演習林の事例から- .  九州森林研究 ( 67 ) 1 - 5   2014.3木材販売方式変更に伴う収支構成の変化-鹿児島大学農学部附属演習林の事例から-Reviewed

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  • Teramoto Yukiyoshi, Oka Masaru, Shimokawa Etsuro .  Growth of Japanese Black Pine Forest and Water Infiltration Rates on the Lava Flows of Sakurajima Volcano, Japan .  Journal of Rainwater Catchment Systems20 ( 1 ) 57 - 62   2014Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Rainwater Catchment Systems Association  

    <p>  From 2000 until 2004, Japanese black pine growing on Sakurajima Volcano has been devastated by pine wilt disease. Most of the pines on the Taisho and Showa lava flows suffered high mortality rates after being invaded by pine wilt disease starting in 2004. We investigated a relationship between the growth of Japanese black pine forest, and the surrounding environment and water infiltration rates into soil of Japanese black pine forest after this invasion and the associated morality. We installed vegetation survey plots in the areas covered by the Taisho and Showa lava flows, which erupted from Sakurajima Volcano in 1914 and 1946, respectively, and conducted field surveys in 2013. In the study plots, for trees with the same diameter at breast height, pines on the Taisho lava flow grew taller than pines on the Showa lava flow; also, the pines on the Taisho lava flow grew faster and with a larger amount of diameter growth than pines on the Showa lava flow. In the study plots, the development of forest soil on the Taisho lava flow was better than that on the Showa lava flow because the Taisho lava flow has a better growth environment for pine, and therefore the water infiltration rate on the Taisho lava flow was larger than that on the Showa lava flow.</p>

    DOI: 10.7132/jrcsa.20_1_57

  • Teramoto Yukiyoshi, Yamamoto Kentaro, Oka Masaru, Shimokawa Etsuro .  Effect of Revegetation on Soil Development and Water Infiltration Rates in Shallow Landslide Scars of Slopes Covered by Volcanic Ash and Pumice Fall .  Journal of Rainwater Catchment Systems20 ( 1 ) 63 - 69   2014Reviewed

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    <p>  This paper addresses the effect of revegetation on forest soil development and water infiltration rates in the shallow landslide scars of slopes covered by volcanic ash and pumice fall. The number of trees and tree species peaked approximately 10 years after the occurrence of the shallow landslides, and then declined with time. Approximately 40 years after the occurrence of the landslides, an apparent steady state was achieved. Based on the temporal variation of the Fisher-Williams' index of diversity, the forest located in the shallow landslide scars reached a climax approximately 40 years after the occurrence of the landslides. Revegetation developed on the forest soil and had grown to a thickness of approximately 40 cm by the time the forest reached a climax approximately 40 years after the landslides. After 58 years, the water infiltration rates and forest soil thickness in the shallow landslide scars were approximately 70 and 65 %, respectively, compared with those measured in the headwater forest of broad-leaf trees.</p>

    DOI: 10.7132/jrcsa.20_1_63

  • 寺本行芳、岡勝、下川悦郎 .  2011年東北地方太平洋沖地震津波の被害を受けた宮城県名取市閖上浜における海岸クロマツの生長履歴と表層土の粒度特性 .  鹿児島大学・演習林研究報告 ( 40 ) 31 - 33   2013.32011年東北地方太平洋沖地震津波の被害を受けた宮城県名取市閖上浜における海岸クロマツの生長履歴と表層土の粒度特性Reviewed

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  • 寺本行芳、岡勝、下川悦郎、江崎次夫 .  姶良カルデラ西壁の海岸域斜面における森林の発達が表層崩壊防止に及ぼす影響 .  海岸林学会誌・日本海岸林学会11 ( 2 ) 71 - 75   2012.12姶良カルデラ西壁の海岸域斜面における森林の発達が表層崩壊防止に及ぼす影響Reviewed

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  • 中澤昌彦、今冨裕樹、岡勝、田中良明、吉田智佳史、上村巧、山口浩和、鈴木秀典、梅田修史、高橋雅弘、藤井義人 .  ロングリーチグラップルを用いた間伐作業システムの開発-システム生産性と伐出コスト- .  森林利用学会誌26 ( 3 ) 173 - 180   2011.8ロングリーチグラップルを用いた間伐作業システムの開発-システム生産性と伐出コスト-Reviewed

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  • 熊澤ゆかり、藤田亮、山崎篤史、小山敢、市原恒一、岡勝 .  安全かつ効率的なフォワーダ集材についての考察 .  森林利用学会誌26 ( 3 ) 181 - 184   2011.8安全かつ効率的なフォワーダ集材についての考察Reviewed

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  • 田中良明、山口智、鈴木秀典、中澤昌彦、吉田智佳史、岡勝 .  DEMを使った単写真測量の検討 .  関東森林学会・関東森林研究62   235 - 238   2011.3DEMを使った単写真測量の検討Reviewed

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  • 岡勝、中澤昌彦、佐々木達也、吉田智佳史、上村巧、鹿島潤、加藤隆 .  高性能林業機械の導入後10年目における林業労働死亡災害の考察 .  森林利用学会誌26 ( 1 ) 27 - 37   2011.1高性能林業機械の導入後10年目における林業労働死亡災害の考察Reviewed

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  • 吉田智佳史、中澤昌彦、毛綱昌弘、陣川雅樹、伊神裕司、高野勉、今冨裕樹、岡勝、古川邦明、臼田寿生、岩岡正博 .  ウッドシアを用いた粗砕による林業バイオマス搬出作業の検討-土場への搬出作業の生産性- .  森林利用学会誌26 ( 1 ) 57 - 64   2011.1ウッドシアを用いた粗砕による林業バイオマス搬出作業の検討-土場への搬出作業の生産性-Reviewed

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  • KUMAZAWA Yukari, FUJITA Makoto, YAMASAKI Atsushi, KOYAMA Kan, ICHIHARA Koichi, OKA Masaru .  Consideration about safety and efficient log transportation by forwarders .  Journal of The Japan Forest Engineering Society26 ( 3 ) 181 - 186   2011Reviewed

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Forest Engineering Society  

    DOI: 10.18945/jjfes.KJ00007331806

  • Yamada Takeshi, Ochiai Yukihito, Kamimura Kana, Oka Masaru .  Increase of productive efficiency of nursery works and plantation utilizing containerized seedlings .  The Japanese Forest Society Congress123 ( 0 ) E12 - E12   2011Reviewed

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    DOI: 10.11519/jfsc.123.0.E12.0

  • OKA Masaru, SASAKI Tatsuya, NAKAZAWA Masahiko, YAMADA Takeshi, OCHIAI Yukihito, IMATOMI Yuki .  Evaluation of the continuous operation system of ground clearance and container seedling planting by cooperated work with harvesting .  The Japanese Forest Society Congress123 ( 0 ) E14 - E14   2011Reviewed

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    DOI: 10.11519/jfsc.123.0.E14.0

  • 鈴木秀典、岡勝、陣川雅樹 .  路網開設に伴う二酸化炭素排出量の現状と今後 .  森林総合研究所研究報告9 ( 4 ) 1 - 10   2010.12路網開設に伴う二酸化炭素排出量の現状と今後Reviewed

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  • 上村巧、岡安崇史、井上英二、加利屋義弘、岡勝、鹿島潤 .  受口切りの不一致やツル幅の不均一が伐倒方向と作業の安全性に及ぼす影響 .  森林利用学会誌25 ( 4 ) 207 - 214   2010.10受口切りの不一致やツル幅の不均一が伐倒方向と作業の安全性に及ぼす影響Reviewed

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  • 鹿島潤、上村巧、佐々木達也、伊藤崇之、岡勝 .  刈払機による小径木の鋸断径 .  森林利用学会誌25 ( 4 ) 221 - 225   2010.10刈払機による小径木の鋸断径Reviewed

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  • 上村巧、佐々木尚三、岡勝、木幡靖夫、松隈茂、加藤隆 .  油圧ショベルをベースマシンとした林業機械の運転手保護対策 .  森林利用学会誌25 ( 3 ) 147 - 154   2010.7油圧ショベルをベースマシンとした林業機械の運転手保護対策Reviewed

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  • 中澤昌彦、今冨裕樹、岡勝、田中良明、吉田智佳史、上村巧、山口浩和、近藤耕次、高橋雅弘、藤井義人 .  ロングリーチグラップルを用いた間伐作業システムの開発-諸条件が木寄生産性に与える影響- .  森林利用学会誌25 ( 1 ) 15 - 22   2010.4ロングリーチグラップルを用いた間伐作業システムの開発-諸条件が木寄生産性に与える影響-Reviewed

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  • 中澤昌彦、松本武、岡勝、田中良明、吉田智佳史 .  中山間地域における路網密度補正係数の特性-境界面積の規模が係数に与える影響- .  森林利用学会誌24 ( 3,4合併号 ) 97 - 106   2009.12中山間地域における路網密度補正係数の特性-境界面積の規模が係数に与える影響-Reviewed

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  • 澤田智志、岡勝、佐々木達也 .  列状間伐後の間伐方法の検討と高能率な作業システムによる間伐の生産性 .  森林利用学会誌24 ( 2 ) 53 - 59   2009.8列状間伐後の間伐方法の検討と高能率な作業システムによる間伐の生産性Reviewed

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  • 近藤道治、今井信、宮崎隆幸、岡勝、佐々木達也 .  点状複層林の上木間伐にともなう下木損傷軽減法の検討-上木の山側伐倒と上木の伐倒前枝打ち- .  森林利用学会誌24 ( 1 ) 3 - 10   2009.4点状複層林の上木間伐にともなう下木損傷軽減法の検討-上木の山側伐倒と上木の伐倒前枝打ち-Reviewed

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  • 上村巧、岡安崇史、鹿島潤、佐々木達也、岡勝、加利屋義弘、井上英二 .  伐倒初期における追口高さが内部応力に与える影響 .  森林利用学会誌24 ( 1 ) 11 - 18   2009.4伐倒初期における追口高さが内部応力に与える影響Reviewed

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  • 田中良明、岡勝、吉田智佳史、近藤耕次、中澤昌彦、都築伸行、小谷英司 .  伐採率が直引集材の可能性に及ぼす影響の検討 .  森林利用学会誌23 ( 4 ) 259 - 262   2009.3伐採率が直引集材の可能性に及ぼす影響の検討Reviewed

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  • 鹿島潤、上村巧、岡勝 .  下刈り作業の刈払機と刈刃の使い分け .  森林利用学会誌23 ( 4 ) 251 - 254   2009.3下刈り作業の刈払機と刈刃の使い分けReviewed

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  • 毛綱昌弘、山口浩和、佐々木達也、岡勝 .  運材車両の追従走行制御装置の開発 .  森林利用学会誌23 ( 3 ) 135 - 140   2008.12運材車両の追従走行制御装置の開発Reviewed

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  • 中澤昌彦、岡勝、田中良明、吉田知佳史、近藤耕次 .  中山間地域における道路網の迂回に関する一検討.森林利用学会誌 .  森林利用学会誌22 ( 4 ) 261 - 264   2008.3中山間地域における道路網の迂回に関する一検討.森林利用学会誌Reviewed

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  • 吉田智佳史、田中良明、陣川雅樹、近藤耕次、中澤昌彦、岡勝、黒瀬勝雄 .  ロングリーチグラップルを用いた集材作業の生産性 .  森林利用学会誌22 ( 4 ) 245 - 248   2008.3ロングリーチグラップルを用いた集材作業の生産性Reviewed

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  • 中澤昌彦、鈴木秀典、岡勝、田中良明、吉田知佳史、近藤耕次、松本武 .  ネットワーク分析による流域内の道路網の階層的・時系列的特性 .  森林利用学会誌22 ( 3 ) 121 - 132   2007.12ネットワーク分析による流域内の道路網の階層的・時系列的特性Reviewed

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  • 岡勝、中澤昌彦、田中良明、吉田智佳史、近藤耕次、加利屋義広 .  フォワーダの走行速度に及ぼす路網規格と積載量の影響 .  森林利用学会誌22 ( 3 ) 163 - 170   2007.12フォワーダの走行速度に及ぼす路網規格と積載量の影響Reviewed

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  • 中澤昌彦、鈴木秀典、岡勝、田中良明、吉田知佳史、近藤耕次、松本武 .  ネットワーク分析を用いた山村地域における道路網の発達過程に関する研究 .  森林利用学会誌22 ( 1 ) 10 - 15   2007.4ネットワーク分析を用いた山村地域における道路網の発達過程に関する研究Reviewed

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  • 田中良明、岡勝、吉田智佳史、近藤耕次、濱本高光 .  フォワーダ集材の動的な作業モデルの検討 .  森林利用学会誌21 ( 4 ) 287 - 290   2007.3フォワーダ集材の動的な作業モデルの検討Reviewed

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  • 岡勝、田中良明、吉田智佳史、近藤耕次、佐々木達也、加利屋義広弘 .  フォワーダ走行速度からみた集材路規格に関する検討 .  森林利用学会誌21 ( 4 ) 295 - 298   2007.3フォワーダ走行速度からみた集材路規格に関する検討Reviewed

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  • Oka,M., Inoue,M and Kobayashi,H .  Studies of the Pattern Classification of the Logging Systems for Thinning on the Basis of the Applicability of Forestry Machines and Features of Logging System .  Jpn. For. Eng. Soc.21 ( 2 ) 115 - 124   2006.8Studies of the Pattern Classification of the Logging Systems for Thinning on the Basis of the Applicability of Forestry Machines and Features of Logging SystemReviewed

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  • 岡勝、佐々木達也、近藤耕次、鹿島潤、濱本高光、加利屋義広、小林洋司 .  簡易な防護具を用いた残存木損傷の軽減効果の検討 .  森林利用学会誌20 ( 4 ) 273 - 276   2006.3簡易な防護具を用いた残存木損傷の軽減効果の検討Reviewed

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  • 岡勝、井上源基、小林洋司 .  稼動実績をもとにした高性能林業機械の損料率の算定 .  森林利用学会誌20 ( 3 ) 183 - 191   2005.12稼動実績をもとにした高性能林業機械の損料率の算定Reviewed

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  • 近藤耕次、鹿島潤、吉田智佳史、岡勝、今冨裕樹 .  トップハンドルチェーンソーによる枝打作業の作業能率 .  森林利用学会誌20 ( 4 ) 257 - 261   2005.12トップハンドルチェーンソーによる枝打作業の作業能率Reviewed

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  • 岡勝、上村巧、井上源基、小林洋司 .  高性能機械の保守・修理費率の検討 .  森林利用学会誌20 ( 2 ) 83 - 94   2005.8高性能機械の保守・修理費率の検討Reviewed

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  • 吉田智佳史、近藤耕次、田中良明、岡勝 .  素材生産事業体における高性能林業機械の保有状況と経営動向への影響 .  森林利用学会誌19 ( 4 ) 255 - 258   2005.3素材生産事業体における高性能林業機械の保有状況と経営動向への影響Reviewed

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  • 井上源基、岡勝、広部伸二、山田容三 .  森林機械化作業のための地理的条件の評価-路網から作業対象域までの到達距離の分布の検討- .  森林利用学会誌16 ( 1 ) 3 - 14   2001.4森林機械化作業のための地理的条件の評価-路網から作業対象域までの到達距離の分布の検討-Reviewed

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  • 岡勝、吉田智佳史、井上源基、鈴木茂夫、亀田宣男 .  ハーベスタ、フォワーダシステムによる合理的作業法の検討(Ⅰ)-ハーベスタの作業性の検討- .  日本林学会論文集109   465 - 468   1999.2ハーベスタ、フォワーダシステムによる合理的作業法の検討(Ⅰ)-ハーベスタの作業性の検討-Reviewed

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  • 井上源基、岡勝、田中良明 .  高性能車両系伐出システムにおける適正作業域と機械の組合わせの検討 .  森林利用学会誌13 ( 3 ) 169 - 182   1998.10高性能車両系伐出システムにおける適正作業域と機械の組合わせの検討Reviewed

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  • 井上源基、岡勝、吉田智佳史 .  タワーヤーダにおける適正索張り線密度の検討 .  森林利用学会誌13 ( 2 ) 99 - 110   1998.8タワーヤーダにおける適正索張り線密度の検討Reviewed

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  • 岡勝、吉田智佳史、田中良明、井上源基、飯田富士雄、福田慎造 .  フォワーダタイプ集材車両の走行特性 .  日本林学会論文集108   441 - 444   1997.12フォワーダタイプ集材車両の走行特性Reviewed

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  • 井上源基、岡勝 .  森林機械化作業計画のための地形評価に関する研究(Ⅱ) -地形傾斜指数に関する検討- .  森林利用学会誌12 ( 2 ) 73 - 82   1997.8森林機械化作業計画のための地形評価に関する研究(Ⅱ) -地形傾斜指数に関する検討-Reviewed

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  • 井上源基、岡勝、広部伸二、山田容三 .  森林機械化作業のための地理的条件の評価-路網から作業対象域までの到達距離の分布の検討- .  森林利用学会誌16 ( 1 ) 3 - 14   1997.8森林機械化作業のための地理的条件の評価-路網から作業対象域までの到達距離の分布の検討-Reviewed

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  • 井上源基、岡勝 .  森林機械化作業計画のための地形評価に関する研究(Ⅰ)-地形傾斜分布と地形の複雑性に関する検討- .  森林利用学会誌11 ( 3 ) 153 - 164   1996.12森林機械化作業計画のための地形評価に関する研究(Ⅰ)-地形傾斜分布と地形の複雑性に関する検討- Reviewed

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Books

  • 一貫作業システムの考え方

    岡 勝( Role: Sole author)

    大日本山林会  2016.8 

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    Total pages:10   Language:Japanese Book type:Scholarly book

  • 低コスト化に向けた一貫作業システムの構築に向けて-伐出から地拵え、植栽まで-

    岡 勝( Role: Sole author)

    山林  2014.11 

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    Language:Japanese Book type:Scholarly book

  • 林業機械化による労働災害の経年的な変化-林業労働死亡災害の現状と課題-

    岡勝( Role: Joint author)

    機械化林業・林業機械化協会  2012.12 

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    Language:Japanese Book type:Scholarly book

  • 高効率作業システムの開発による生産性の向上

    岡勝( Role: Joint author)

    山林・大日本山林会  2012.7 

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    Language:Japanese Book type:Scholarly book

  • 伐出作業

    岡 勝( Role: Joint author)

    森林大百科事典・朝倉書店  2009.8 

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    Language:Japanese Book type:Scholarly book

  • 高性能林業機械作業

    岡 勝、吉田智佳史( Role: Joint author)

    森林大百科事典・朝倉書店  2009.8 

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    Language:Japanese Book type:Scholarly book

  • 機械の使用実態に基づく高性能林業機械の機械損料率の算定(2)-機械損料率の算定-

    岡 勝( Role: Sole author)

    林業機械化協会  2007.3 

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    Total pages:7   Language:Japanese Book type:Scholarly book

  • 機械の使用実態に基づく高性能林業機械の機械損料率の算定(1)-保守・修理費の現状-

    岡 勝( Role: Sole author)

    林業機械化協会  2007.2 

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    Total pages:7   Language:Japanese Book type:Scholarly book

  • 生産性の比較

    岡 勝( Role: Joint author)

    機械化のマネジメント・全国林業改良普及協会  2001.3 

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    Language:Japanese Book type:Scholarly book

  • 森林作業条件の把握

    岡 勝( Role: Joint author)

    機械化のマネジメント・全国林業改良普及協会  2001.3 

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    Language:Japanese Book type:Scholarly book

  • 作業システムの選択

    岡 勝( Role: Joint author)

    機械化のマネジメント・全国林業改良普及協会  2001.3 

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MISC

  • 一貫作業システムの技術的な課題

    岡 勝

    林業経済   70 ( 8 )   13 - 14   2018.11

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  • わが国の伐出作業システムの現状と課題

    岡 勝

    森林利用学会誌   22 ( 2 )   75 - 78   2007.8

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Presentations

  • 岡 勝、芦原 誠一、野下 治巳、内原 浩之   フェラーバンチャ機能を有するグラップル付きバケットを用いた全木伐倒・集材の試行  

    第20回森林利用学会学術研究発表会  第20回森林利用学会学術研究発表会

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    Event date: 2013.11

    Language:Japanese  

    Venue:島根県浜田市  

    国内学会

  • 岡村 翔、岡 勝、寺本 行芳、下川 悦郎   高隈演習林における森林の生長が斜面災害の発生に及ぼす影響  

    第20回森林利用学会学術研究発表会  第20回森林利用学会学術研究発表会

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    Event date: 2013.11

    Language:Japanese  

    Venue:島根県浜田市  

    国内学会

  • 奥山 洋一郎、芦原 誠一、岡 勝、溝添 俊樹   販売方式変更に伴う収支構造の比較-高隈演習林の販売方式から-  

    九州森林学会  九州森林学会

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    Event date: 2013.10

    Language:Japanese  

    Venue:宮崎  

    国内学会

  • 山田 健、落合 幸仁、上村 佳奈、岡 勝   コンテナ苗による育苗と植栽の高能率化  

    第123回日本森林学会大会  第123回日本森林学会大会

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    Event date: 2012.3

    Language:Japanese  

    Venue:宇都宮  

    国内学会

  • 岡 勝、佐々木達也、中澤昌彦、山田健、落合幸仁、今冨裕樹   伐出との連携作業による地拵え・コンテナ苗植栽の一貫作業システムの評価  

    第123回日本森林学会大会  第123回日本森林学会大会

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    Event date: 2012.3

    Language:Japanese  

    Venue:宇都宮  

    国内学会

  • 鹿又秀聡、中島徹、岡勝   伐出見積もりシステムの開発と森林組合への導入  

    第18回森林利用学会学術研究発表会  第18回森林利用学会学術研究発表会

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    Event date: 2011.11

    Language:Japanese  

    Venue:京都  

    国内学会

  • 山田健、落合幸仁、岡勝、上村佳奈   国産樹種のコンテナ育苗作業功程  

    第122回日本森林学会  第122回日本森林学会

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    Event date: 2011.3

    Language:Japanese  

    Venue:静岡  

    国内学会

  • 岡勝、佐々木達也、中澤昌彦、山田健、落合幸仁、今冨裕樹、山口浩和   伐出との連携による地拵え作業の軽減効果  

    第122回日本森林学会  第122回日本森林学会

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    Event date: 2011.3

    Language:Japanese  

    Venue:静岡  

    国内学会

  • 中澤昌彦、松本武、岡勝、吉田智佳史、佐々木達也   低コスト作業路網における路網密度補正係数の特性  

    第122回日本森林学会大会学術講演集  第122回日本森林学会大会学術講演集

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    Event date: 2011.3

    Language:Japanese  

    Venue:静岡  

    国内学会

  • 吉田智佳史、中澤昌彦、毛綱昌弘、陣川雅樹、伊神裕司、佐々木達也、岡勝、古川邦明、臼田寿生、岩岡正博、草野喜行、田中誠一郎   バイオマス対応型プロセッサの作業性能の評価  

    第122回日本森林学会大会学術講演集  第122回日本森林学会大会学術講演集

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    Event date: 2011.3

    Language:Japanese  

    Venue:静岡  

    国内学会

  • 佐々木達也、上村巧、岡勝、吉田智佳史、中澤昌彦、鹿島潤、伊藤崇之   集材架線設計支援ソフトウェアの開発  

    第122回日本森林学会大会学術講演集  第122回日本森林学会大会学術講演集

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    Event date: 2011.3

    Language:Japanese  

    Venue:静岡  

    国内学会

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