NARA Koichi 奈良宏一

Researcher Number	80113710
External Links
Affiliation (based on the past Project Information) *help	1994 – 2006: 茨城大学, 工学部, 教授 1992: Faculty of Engineering, Ibaraki University, Professor, 工学部, 教授 1991: 広島大学, 工学部, 助教授 1987 – 1989: Faculty of Engineering, University of Hirishima,Associate Prof., 工学部, 助教授 1986: 北見工業大学, 工学部, 助教授
Review Section/Research Field	Principal Investigator 電力工学・電気機器工学 / 電力工学 / 電力工学・電気機器工学 Except Principal Investigator 電力工学 / 電力工学・電気機器工学
Keywords	Principal Investigator 配電系統 / 分散型電源 / Distribution System / Distribution system / 電力系統 / FRIENDS / 系統連系要件 / 分散型電力貯蔵装置 / タブー探索 / 組合せ最適化 … More / Load Transfer / 負荷切替 / Effective Gradient Method / Mixed-Integer Programming / Distribution System Planning / Section Load Measurement / Restoration Priority / Restorative Operation / 負荷計測 / 区間負荷 / 復旧操作 / 有効匂配法 / 配電統計計画 / 有効勾配法 / 混合整数計画 / 配電系統計画 / 区間負荷計測 / 復旧優先順位 / 事故時復旧操作 / Autonomous control / Voltage control / Congestion management / Electric power system / Distribution grid code / Distributed generators / 自律分散制御 / 電圧制御 / 系統混雑制御 / Tabu Search / Distributed Energy Storage Systems / Optimal Planning / Optimal Operation / Power System / Guide-line for DG interconnection / Distributed Generators / 最適設備計画 / 最適運用 / Demand Side Management / Energy Conservation / Power Electronics / Distributed Energy Storage System / Distributed Generator / Power Quality / Unbundled Power Quality Services / デマンドサイドマネージメント / 省エネルギー / パワーエレクトロニクス / 電力品質 / 多品質電力供給 / Branch exchange / Tabu search / Combinatorial optimization / Cost of power interruption / Power supply reliability / Distribution losses / Dispersed generators / タブ-探索 / ブランチ交換法 / 組合わせ最適化 / 停電損失 / 供給信頼性 / 配電損失 / Scenario Analysis / Flexibility / Combinatorial Optimization / Multi-objective optimization / Facility Installation Planning / Electrical Power Resource Planning / Electrical Power System / 多目的計画法 / シナリオ解析 / 柔軟性 / 多目的計画 / 設備計画 / 電源計画 / Distribution Systems Loss Minimization / Simulated Annealing / Loss Minimization / Simple Genetic Algorithm / Genetic Algorithm / シミュレ-テッドアニ-リング / シミュレーテッドアニーリング / 配電損失最小化 / 損失最小化 / 単純遺伝アルゴリズム / 遺伝的アルゴリズム / 遺伝アルゴリズム … More Except Principal Investigator FRIENDS / Security index / Security control / Transient stability / Pattern recognition / Elecric power system / 動的セキュリティ予防制御 / 過渡安定度 / セキュリティ予防制御 / 火力発電機の起動停止 / 重大事故の自動選択 / 想定事故解析 / セキュリティ指標 / セキュリティ制御 / 過度安定度 / パターン認識 / 電力系統 / Power Distribution System / Power Delivery System / Supply Reliability / Power Quality / Uninterruptible Power Supply / Quality Control Center / Multi-Menu Service / 高停電電力供給 / 配電システム / 電力流通システム / 信頼度 / 電力品質 / 無停電電力供給 / 電力改質センター / マルチメニューサービス Less

Research for Power Systems Control Through Distributed Generators and Verification of its EffectPrincipal Investigator
- Principal Investigator
  
  NARA Koichi
- Project Period (FY)
  2004 – 2006
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  電力工学・電気機器工学
- Research Institution
  Ibaraki University
Study on the Optimal Operation and Planning of Power systems with a lot of Distributed GeneratorsPrincipal Investigator
- Principal Investigator
  
  NARA Koichi
- Project Period (FY)
  2001 – 2003
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  電力工学・電気機器工学
- Research Institution
  IBARAKI UNIVERSITY
Research for Systems Technologies for Unbundled Power Quality ServicesPrincipal Investigator
- Principal Investigator
  
  NARA Koichi
- Project Period (FY)
  1998 – 2000
- Research Category
  
  Grant-in-Aid for Scientific Research (A).
- Research Field
  
  電力工学・電気機器工学
- Research Institution
  Ibaraki University
Research on Evaluation of Dispersed Generations Installed in Distribution SystemsPrincipal Investigator
- Principal Investigator
  
  NARA Koichi
- Project Period (FY)
  1997 – 1999
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  電力工学・電気機器工学
- Research Institution
  IBARAKI UNIVERSITY
Basic Study on Flexible, Reliable and Intelligent Electrical Energy Delivery System
- Principal Investigator
  
  HASEGAWA Jun
- Project Period (FY)
  1996 – 1998
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Research Field
  
  電力工学・電気機器工学
- Research Institution
  HOKKAIDO UNIVERSITY
RESEARCH FOR EVALUATION METHOD OF FLEXIBILITY OF ELECTRICAL POWER SYSTEMS PLANNINGPrincipal Investigator
- Principal Investigator
  
  NARA Koichi
- Project Period (FY)
  1994 – 1995
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  電力工学・電気機器工学
- Research Institution
  IBARAKI UNIVERSITY
Research for Distribution Systems Loss Minimization by Genetic AlgorithmPrincipal Investigator
- Principal Investigator
  
  NARA Koichi
- Project Period (FY)
  1991 – 1992
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  電力工学
- Research Institution
  IBARAKI UNIVERSITY
  Hiroshima University
A STUDY ON OPTIMAL LOAD TRANSFER OPERATION IN LARGE-SCALE URBAN DISTRIBUTION SYSTEMSPrincipal Investigator
- Principal Investigator
  
  NARA Koichi, AOKI Kenichi
- Project Period (FY)
  1988 – 1989
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  電力工学
- Research Institution
  HIROSHIMA UNIVERSITY
Study on Dynamic Security Preventive Control of Power Systems
- Principal Investigator
  
  YAMASHIRO Susumu
- Project Period (FY)
  1986 – 1987
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  電力工学
- Research Institution
  Kitami Institute of Technology

All 2006 2005 2004

All Journal Article

[Journal Article] Distributed Generators and a New Paradigm of Power Delivery System Demonstrative Projects in Japan-2006
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of the 6th WSEAS International Conference on Power Systems (Invited Plenary Speech)
  
  Pages: 3-3
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Voltage Control of Distribution System by Autonomous Control of Distribution Generators2006
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of The International Conference on Electrical Engineering 2006 (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Optimal Network Configuration of FRIENDS Taking Power Supply Reliability into Account2006
- Author(s)
  K.Nara
- Journal Title
  
  Electrical Engineering in Japan Vol.156 No.3
  
  Pages: 32-40
- NAID
  210000163723
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Voltage Control of Distribution System by Autonomous Control of Distribution Generators2006
- Author(s)
  Koichi Nara
- Journal Title
  
  Proc. of The International Conference on Electrical Engineering 2006 (CD-ROM)
  
  Pages: 1-6
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Optimal Network Configuration of FRIENDS Taking Power Supply reliability into Account2006
- Author(s)
  Koichi Nara
- Journal Title
  
  Electrical Engineering in Japan Vol.156,No.3
  
  Pages: 32-40
- NAID
  210000163723
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Distributed Generators and a New Paradigm of Power Delivery System Demonstrative Projects in Japan2006
- Author(s)
  Koichi Nara
- Journal Title
  
  Proc. of the 6th WSEAS International Conference on Power Systems(Invited Plenary Speech)
  
  Pages: 3-3
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Distributed Generators and a New Paradigm of Power Delivery System Demonstrative Projects in Japan2006
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of the 6th WSEAS International Conference on Power Systems (Invited Plenary Speech)
  
  Pages: 3-3
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Enabler of Distributed Generation Integration -A Future Power Delivery System・2006
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of International Workshop on Sustainable Energy and Materials 2006
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Enabler of Distributed Generation Integration-A Future Power Delivery System-2006
- Author(s)
  Koichi Nara
- Journal Title
  
  Proc. of International Workshop on Sustainable Energy and Materials 2006
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A New paradigm of Electric Power Delivery System2006
- Author(s)
  Koichi Nara
- Journal Title
  
  Proc. of The International Conference on Electrical Engineering 2006(Invited paper) (CD-ROM)
  
  Pages: 1-6
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Optimal Network Configuration of FRIENDS Taking Power Supply Reliability into Account2006
- Author(s)
  K.Nara
- Journal Title
  
  Electrical Engineering in Japan Vol.156, No.3
  
  Pages: 32-40
- NAID
  210000163723
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A New Paradigm of Electric Power Delivery System2006
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of The International Conference on Electrical Engineering 2006 (Invited paper) (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Enabler of Distributed Generation Integration -A Future Power Delivery System-2006
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of International Workshop on Sustainable Energy and Materials 2006
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A Comparison Between Loop and Radial Configuration of FRIENDS2005
- Author(s)
  Y.Mishima, T.Satoh, K.Nara
- Journal Title
  
  Proc. of International Symposium on EcoTopia Science 2005
  
  Pages: 401-404
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Connection of Renewable Energy to Power Systems2005
- Author(s)
  K.Nara
- Journal Title
  
  Proceedings of The International Conference on Electrical Engineering 2005
  
  Pages: 1-6
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Three-phase Power Flow for FRIENDS Network2005
- Author(s)
  Y.Mishima, K.Sugawara, T.Satoh, K.Nara
- Journal Title
  
  Proceedings of 2005 IEEE International Symposium on Circuits and Systems
  
  Pages: 4733-4736
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Three-phase Power Flow for FRIENDS Network2005
- Author(s)
  Y.Mishima, K.Sugawara, T.Satoh, K.Nara
- Journal Title
  
  Proc.of 2005 IEEE International Symposium on Circuits and Systems
  
  Pages: 4733-4736
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Elementary Investigation of Effects of Co-generation Systems on Power Systems Load Leveling2005
- Author(s)
  Y.Mishima, A.Sato, S.Ishizu, T.Satoh, K.Nara
- Journal Title
  
  Proc.of The International Conference on Electrical Engineering 2005 (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Connection of Renewable Energy to Power Systems2005
- Author(s)
  K.Nara
- Journal Title
  
  Proceedings of The International Conference on Electrical Engineering 2005 (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Connection of Renewable Energy to Power Systems2005
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of The International Conference on Electrical Engineering 2005 (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Optimal Network Configuration of FRIENDS Taking Power Supply Reliability into Account2005
- Author(s)
  K.Nara, T.Satoh, Y.Mishima
- Journal Title
  
  IEEJ Trans.PE Vo1.125, No.1
  
  Pages: 45-52
- NAID
  210000163723
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Voltage Control Availability of Distributed Generators in Power Distribution System2005
- Author(s)
  K.Nara, S.Ishizu, Y.Mishima
- Journal Title
  
  Proc.of IEEE PES St. Petersburg Power Tech (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Voltage Control Availability of Distributed Generators in Power Distribution System2005
- Author(s)
  K.Nara, S.Ishizu, Y.Mishima
- Journal Title
  
  Proceedings of IEEE PES St. Petersburg Power Tech (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] 供給信頼性を考慮したFRIENDSのネットワーク構成手法2005
- Author(s)
  奈良宏一, 佐藤泰司, 三島裕樹
- Journal Title
  
  電気学会論文誌B分冊 Vol.125 No.1
  
  Pages: 45-52
- NAID
  10014100568
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A Comparison between Loop and Radial Configuration of FRIENDS2005
- Author(s)
  Y.Mishima, T.Satoh, K.Nara
- Journal Title
  
  Proceedings of The International Symposium on EcoTopia Science 2005
  
  Pages: 401-404
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Intelligent Systems Application to FRIENDS2005
- Author(s)
  K.Nara
- Journal Title
  
  Proceedings of 13th International Conference on Intelligent Systems Application to Power Systems 2005
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Intelligent Systems Application to FRIENDS2005
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of 13th International Conference on Intelligent Systems Application to Power Systems 2005
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Voltage Control Availability of Distributed Generators in Power Distribution System2005
- Author(s)
  K.Nara, S.Ishizu, Y.Mishima
- Journal Title
  
  Proceedings of IEEE PES St. Petersburg Power Tech
  
  Pages: 1-6
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Elementary Investigation of Effects of Co-generation Systems on Power Systems Load Leveling2005
- Author(s)
  Y.Mishima, A.Sato, S.Ishizu, T.Satoh, K.Nara
- Journal Title
  
  Proceedings of The International Conference on Electrical Engineering 2005 (CD-ROM)
  
  Pages: 1-6
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A Comparison Between Loop and Radial Configuration of FRIENDS2005
- Author(s)
  Y.Mishima, T.Satoh, K.Nara
- Journal Title
  
  Proceedings of International Symposium on EcoTopia Science 2005
  
  Pages: 401-404
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Elementary Investigation of Effects of Co-generation Systems on Power Systems Load Leveling2005
- Author(s)
  Y.Mishima, A.Sato, S.Ishizu, T.Satoh, K.Nara
- Journal Title
  
  Proceedings of The International Conference on Electrical Engineering 2005
  
  Pages: 1-6
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Loss Reduction Effects by Distributed Generators in FRIENDS2004
- Author(s)
  Y.Mishima, T.Satoh, K.Nara
- Journal Title
  
  Proc.of The Joint International Conference on "Sustainable Energy and Environment (SEE)" Vol.1
  
  Pages: 442-445
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Effects of Distributed Generators to Distribution Systems Voltage Profile2004
- Author(s)
  K.Nara, T.Satoh, Y.Mishima
- Journal Title
  
  Proc.of ICEE 2004 Vol.2
  
  Pages: 283-288
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A Least Cost Planning Method of FRIENDS2004
- Author(s)
  K.Nara
- Journal Title
  
  Proceedings of IEEE PSCE 2004 (CD-ROM)
  
  Pages: 1-5
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A Least Cost Planning Method of FRIENDS2004
- Author(s)
  K.Nara
- Journal Title
  
  Proc. of IEEE PSCE 2004 (CD-ROM)
  
  Pages: 1-5
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Effects of Distributed Generators to Distribution Systems Voltage Profile2004
- Author(s)
  K.Nara, T.Satoh, Y.Mishima
- Journal Title
  
  Proceedings of ICEE 2004 Vol.2
  
  Pages: 283-288
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] Loss Reduction Effects by Distributed Generators in FRIENDS2004
- Author(s)
  Y.Mishima, T.Satoh, K.Nara
- Journal Title
  
  Proceedings of The Joint International Conference on "Sustainable Energy and Environment (SEE)" Vol.1
  
  Pages: 442-445
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-16560239
[Journal Article] A Least Cost Planning Method of FRIENDS2004
- Author(s)
  K.Nara
- Journal Title
  
  Proceedings of IEEE PSCE 2004
  
  Pages: 1-6
- Data Source
  KAKENHI-PROJECT-16560239

1. MISHIMA Yuji (50312773)

# of Collaborated Projects: 3 results

# of Collaborated Products: 17 results
2. HAYASHI Yasuhiro (40257209)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
3. HASEGAWA Jun (40001797)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
4. OYAMA Tsutomu (40160642)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
5. TSUJI Kiichiro (30029342)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
6. SATOH Taiji (80344836)

# of Collaborated Projects: 2 results

# of Collaborated Products: 14 results
7. AOKI Kenichi (80034297)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
8. SASAKI Hiroshi (10034349)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
9. YAMASHIRO Susumu (60041951)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
10. NAKAMURA Koichi (10133810)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
11. NAKAMURA Yoichi (30110638)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
12. SATOH Taiji (10178741)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
13. 錦織昭峰 (40198453)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
14. ALEXANDER Do

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results

NARA Koichi 奈良 宏一

Research Projects

Research Products

Co-Researchers

Research for Power Systems Control Through Distributed Generators and Verification of its EffectPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Study on the Optimal Operation and Planning of Power systems with a lot of Distributed GeneratorsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Research for Systems Technologies for Unbundled Power Quality ServicesPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Research on Evaluation of Dispersed Generations Installed in Distribution SystemsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Basic Study on Flexible, Reliable and Intelligent Electrical Energy Delivery System

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

RESEARCH FOR EVALUATION METHOD OF FLEXIBILITY OF ELECTRICAL POWER SYSTEMS PLANNINGPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Research for Distribution Systems Loss Minimization by Genetic AlgorithmPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

A STUDY ON OPTIMAL LOAD TRANSFER OPERATION IN LARGE-SCALE URBAN DISTRIBUTION SYSTEMSPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Study on Dynamic Security Preventive Control of Power Systems

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Journal Article] Distributed Generators and a New Paradigm of Power Delivery System Demonstrative Projects in Japan-2006

Author(s)

Journal Title

Description

Data Source

[Journal Article] Voltage Control of Distribution System by Autonomous Control of Distribution Generators2006

Author(s)

Journal Title

Description

Data Source

[Journal Article] Optimal Network Configuration of FRIENDS Taking Power Supply Reliability into Account2006

Author(s)

Journal Title

NAID

Description

Data Source

[Journal Article] Voltage Control of Distribution System by Autonomous Control of Distribution Generators2006

Author(s)

Journal Title

Data Source

[Journal Article] Optimal Network Configuration of FRIENDS Taking Power Supply reliability into Account2006

Author(s)

NARA Koichi 奈良宏一