国内: 海外
分野: 金融
製品: Gurobi Optimizer
「手元にお金がない!」―― 誰にでも日常起こりうる事です。私たちは、財布の中のお金を知らず知らずのうちに使ってしまいます。そんな時でも街角の至る所でお金を引き出す事ができ、非常に便利な世の中です。しかし、実際にお金がどのようにATMに入ってくるのでしょうか?そして、いったい誰が、引き出すのに十分なお金がそこにあると保証してくれているのでしょうか?このプロセスの裏には、一見して見えるよりもはるかに複雑なものがあります。現金をどのようにATMに供給するかを最適に制御するためには、複雑なアルゴリズムが使われています。これらアルゴリズムは、Gurobiの最適化アルゴリズムを含むソフトウェア ソリューションの一部として、ドイツのWincor Nixdorf社により設計されました。
Wincor Nixdorf社は、世界130か国以上でビジネスを展開しています。特に自国ドイツのマーケットでは業界トップの企業であり、ドイツにあるほぼすべてのATMがこの会社のロゴマークで飾られています。Wincor Nixdorf社はATMなどのハードウェアの大手の製造業者ですが、ソフトウェアやサービスもWincor Nixdorf社の製品において、その重要な役割が増しています。これらの分野で集中的に努力すべき点は、効率的でかつ安全な現金輸送および現金を使わない支払方法にあります。これらを解決するため、Wincor Nixdorf社が市場に提供しているソリューションがCash Cycle Managementであり、これにより、銀行と代理店における現金管理のプロセスが自動化され、また現金輸送のためのロジスティクスチェーン全体も短縮できます。
Gurobiは、私達のソフトウェア製品において、重要なコンポーネントです。私達のケースでは、Javaインターフェースを介してGurobiにアクセスしています。なぜなら、私達のソースコードにシームレスに統合することができるからです。またGurobiは、非常に安定していて柔軟性が高いため、私たちは専門性が高い手法でさえ、たびたび採用することができます。これにより、追加の要求を容易に統合することができ、それら全てをGurobiで解く事が可能になりました。
長期間に渡りリーダーシップの地位を維持し続けている信頼できるパートナーが、私達にとってはとても重要です。私達は、遂にそのようなパートナーであるGurobiを見つけることができました。
現金輸送のロジスティクスには、一つの最適化モデルに集約しなくてはいけない、いくつかの取り組むべき最適化の問題があります。これらの問題の一つが、個々のATMおよび銀行の各支店の金庫にある両方の現金を管理することです。多様なビジネス要求の中で、各ATMと各銀行の金庫内の現金の流れの予測を最適化モデルで考慮できるようにすることが重要です。その目的は、現金を切らすこともなく、顧客に悪い印象を与えることもなく、また逆に現金が必要以上にありすぎることもないという状態です。これは、銀行に利息の支払いをもたらさず、そしてセキュリティ上のリスクも軽減します。
同時に対処すべきもう一つの重要な最適化問題は、サプライチェーンの運用にかかる費用を最小化することです。この費用には、配送経路のそれぞれの拠点において必要な現金を維持する費用だけでなく、中央銀行から各ATMや金庫への現金輸送に関連した費用も含まれます。さらに問題を複雑にしているのが、様々な法律の規定に準拠しなくてはいけないということです。それらの中には、ヨーロッパ中央銀行からの要求仕様であるATMによる偽札検知が行われた現金だけがATMを再循環する、という規定などが含まれます。全体として、これらを含む様々な要求仕様により、問題を単なる在庫管理とは言えない問題にしています。
このような複雑で細かなプロセスをモデリングするための重要なツールとなるのが、カスタマイズ可能で信頼できるソルバーです。これを考慮してWincor Nixdorf社では、Gurobiの幅広い分野での活用に成功しています。
「私達の多くの最適化問題は、混合整数計画法としてモデル化することができます。Gurobiは、これら問題をいつでも、迅速にかつ正確に解くことができます。
Dr. Peter Lietz, Senior Operations Research Analyst
現金輸送のためのロジスティクス チェーンにおいて、各お客様で大きな相違点があるにも関わらず、Gurobiは幅広いWincor Nixdorf社のお客様で生じるすべての最適化問題を、十分に高速かつ柔軟に解決できる事を証明しました。大抵の場合、制約条件の追加または修正するようなほんの2、3のモデルの変更においても、お客様の個々の要求に応じたソフトウェアのカスタマイズが必要とされます。更に、質問が生じた際には、Gurobiのサポートはいつでもどのような質問でも対応できるという評判を得続けています。
そしてGurobiの柔軟なライセンス体系は、システムの展開をより簡単にしてくれます。結果、銀行および代理店は、Gurobiを活用したWincor Nixdorf社のCash Cycle Management ソリューションを使うことで効率的に現金を管理し、毎年多額の費用を節約しています。
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