著者

Shingo Obata Chris J. Cieszewski Pete Bettinger Roger C. Lowe III Sergio Bernardes

出版者

FORMATH Research Group

雑誌

FORMATH (ISSN:21885729)

巻号頁・発行日

vol.18, pp.001, 2019-04-06 (Released:2019-04-06)

参考文献数

19

被引用文献数

4

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A determination of forest characteristics across broad areas is of great concern to the forest industry in the southern United States, as timber supply decisions can be based on opportunities, or lack of thereof, across all wood procurement areas. This is important in areas such as the southern United States, where the land ownership distribution is highly fragmented and where no general comprehensive source of forest data exists other than the low-intensity USDA Forest Service FIA surveys. In an effort to describe forest characteristics along the lower Coastal Plain of the State of Georgia (USA), we utilized a time series of Landsat data and an algorithm that assesses an integrated forest Z score. The methodology was used to create disturbance maps for over 30 years that represent the year of disturbance for specific locations. The overall accuracy was 52% when all years were considered, and approximately 70% from 1991 forward. Preliminary findings showed moderate levels of accuracy when determining ages for current forests, most of which are even-aged nature stands. Further modifications to the process were necessary to adapt to the unique conditions of study region. The modeling process also prompted several areas for future refinement, including improvement of the temporal resolution of the analysis by using all the available Landsat imagery and detection of the regeneration that normally occurs several years after disturbances.

著者

Atsushi Yoshimoto Patrick Asante Masashi Konoshima

出版者

FORMATH Research Society

雑誌

FORMATH (ISSN:21885729)

巻号頁・発行日

pp.16.003, (Released:2017-04-07)

参考文献数

15

被引用文献数

2 2

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We propose an alternative approach for optimal forest stand aggregation for implementing harvest scheduling, which allows for multiple harvests using a compact formulated integer programming that seeks an optimal aggregated pattern among candidates for forest management units over the planning horizon. We deal with aggregation of small forest stands by introducing the concept of a "hyper unit" as a possible aggregated management unit, which is predefined with the use of adjacency relationship among the set of forest stands. Our proposed approach is based on an optimization framework of a traditional spatially constrained harvest scheduling problem which is used to choose the best set of treatments for the aggregated management units, as well as the original un-aggregated forest stands, while allowing for multiple harvests. We also apply adjacency constraints to create aggregated management units, which are separated from other units, as well as un-aggregated forest stands such that, no adjacent units are harvested in the same period.

著者

Kenan Ok Bob Izlar Jacek Siry

出版者

FORMATH Research Society

雑誌

FORMATH (ISSN:21885729)

巻号頁・発行日

vol.14, pp.11-19, 2014 (Released:2015-03-23)

参考文献数

22

被引用文献数

1 1

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Countries in the world might be classified for discussion purposes at international meetings using definitions such as small island developing states, low forest cover countries, rich forest cover countries, forest product exporters, importers, donors, etc. that use their forestry characteristics. While some countries generate income from forests, some have to compensate deficit on revenue to sustain their forests. Nations have rights and responsibilities to cooperate in sustainable forest management at the country level and global scale. Some mechanisms, such as the Global Environmental Facility (GEF) and Reduced Emissions from Deforestation and Forest Degradation (REDD), were generated by international institutions to support various countries' needs to solve local problems related to global concerns including sustainable forest management. The suitability of these mechanisms is under discussion at international meetings. Green economy and green accounting terms have also been discussed using mechanisms for payment for ecosystem services (PES). The aim of this study is to develop a method to compute the financial contribution levels for cooperation among countries with different characteristics regarding forestry activities and common forest values. Using general equilibrium models, a balance equation consisting of variables dealing with country rights and responsibilities for sustainable forests is offered as a method to hypothetically classify nations. This equation was tested using random hypothetical data. The results indicate the equation may be used to understand the relative classification of the countries.

著者

田中 万里子

出版者

FORMATH研究学会

雑誌

FORMATH (ISSN:21885729)

巻号頁・発行日

vol.6, pp.101-114, 2007 (Released:2020-06-05)

参考文献数

3

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現在, ICタグやICカードなどのRFID技術がIT分野のキーテクノロジーになっている. この技術とネットワークを利用することで, ユーザインターフェースを容易にした使い易いシステムを実現しようとしている.流通業界では食品トレーサビリティのためのシステムが作られ, 博物館等では入場者管理やインタープリーティングでも活用されている.そこで, RFID技術の現状とこれを使ったシステムの実例やアイデアを紹介する. そして, 現在森林情報では未利用であるが, 森林や林産物の分野への応用について考察する.

著者

二宮 嘉行 栁原 宏和 吉本 敦

出版者

FORMATH研究学会

雑誌

FORMATH (ISSN:21885729)

巻号頁・発行日

vol.6, pp.43-56, 2007 (Released:2020-06-05)

参考文献数

15

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林分内の間伐効果・競合効果・成長パターンの異質性などを検知する問題では, 非正則モデルに基づく分析が必要となるが, それらの分析手法には通常の統計理論を適用することはできない. 状況や検証したい仮説により使用する非正則モデルは異なり, 今までの非正則モデルに基づく分析では, それらのモデルごとに性質が議論されてきた. しかしながら, 近年それらを統一的に扱う理論が発展されつつある. 本論文では, 非正則モデルの主である局所錘モデルにおける検定問題に注目し,通常の検定とどう異なるかを説明し, 林分成長分析におけるその必要性について検討する.

著者

Bir Bahadur Khanal Chhetri

出版者

FORMATH研究会

雑誌

FORMATH (ISSN:21885729)

巻号頁・発行日

pp.14.001, (Released:2014-12-26)

参考文献数

43

被引用文献数

2

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The paper empirically examines the contribution of forest-environmental income, and its role in well-being outcomes among the forest dependent households in rural Nepal. The results are based on a one-year survey of 303 households that included the detailed information on household demographics, income and assets and the people's perception in the change in their well-being compared to the last five year. To capture likely non-linear dynamics of well-being status, a probit regression model is tested. Overall, forest environmental income contributed an average of 16% of the total household income. Relative environmental reliance decreased with rising income while absolute environmental income increased. The perception of well-being was related to shock exposure and households' endowments to cope with shocks. In particular, households exposed to several consecutive shocks (two or more severe shocks) over the course of five years significantly reported to be worse-off. The limited role of forest in improving the well-beings of the households is associated with their limited access to the resources. Identification of income groups, their expected wealth status, and asset and access constraints that limit economic advance are used to suggest appropriate targets of intervention.