Nb系BCC固溶体合金の水素吸蔵特性とその水素化物の結晶構造

室蘭工業大学Muroran Institute of Technology博士（工学）本研究では、体心立方（BCC）構造を有するNb系固溶体合金における水素吸蔵挙動と水素化物の結晶構造を調査し、有効水素吸蔵量の増加機構を明らかにすることを目的とした。 V系BCC固溶体合金は、常温・常圧付近で高い水素吸蔵能を示すが、実用的な圧力範囲では一水素化物と二水素化物間の反応によって水素を吸蔵放出する。このとき、一水素化物中の水素は反応に寄与しないため「死蔵水素」となり、有効水素吸蔵量の制限要因となる。有効水素吸蔵量とは、この反応によって可逆的に移動する水素量と定義される。V–Ti–Cr合金では、Cr添加によって有効水素吸蔵量が増加することが知られており、その主因は一水素化物中の水素量減少にあるとされるが、詳細な機構は未解明である。 そこで本研究では、Vと同様にBCC固溶体を形成し、水素との類似した熱力学特性を持つ一方で、合金化による格子定数の変化傾向がVとは異なるNbに着目した。まず、NbとTi, V, Zr, Mo, Hf, Ta, Wとの二元系合金について検討した結果、Mo添加によって有効水素吸蔵量が増加することが明らかになった。この増加は、二水素化物の水素量はほぼ一定である一方、一水素化物中の水素量が減少したことによるものであった。これは、二水素化物中の水素原子間距離がWestlakeの経験則より大きかったことと、一水素化物の熱安定性が低下したことが示唆される。 さらに、室温付近（40 ℃）での有効水素吸蔵量増加を目指して、Moに加えTiを合金化した。Moは一水素化物の水素量を制御するため、TiはMoによって上昇したプラトー圧を低下させ、実用的な圧力範囲内での反応観測を可能にするためである。Nb–Mo–Ti合金においても、有効水素吸蔵量はMoおよびTi量の増加とともに増加し、その主因は一水素化物中の水素量減少にあると考えられる。 最後に、Nb–Mo合金の一水素化物において、中性子回折およびリバースモンテカルロ法により重水素原子の位置と占有状態を解析した。その結果、Mo添加によりサイトは変化せず、占有率は低下した。また、重水素原子はNbおよびMo原子に対してランダムに配置されており、これは水素が特定の金属と局所的に結合せず、金属全体と共有的な相互作用を通じて存在することを示唆する。 以上より、Nb系BCC固溶体合金において、MoおよびTiを適切に添加することで、一水素化物の熱的安定性と水素量を制御し、有効水素吸蔵量を増加させることが可能であることを示した。本研究は、実用的な水素貯蔵材料設計における一水素化物制御の重要性を実験的かつ構造解析的に示した点に意義がある。This study aims to clarify the mechanism underlying the increase in reversible hydrogen capacity in Nb-based solid solution alloys with a body-centered cubic (BCC) structure by investigating their hydrogen absorption behavior and the crystal structures of their hydrides. V-based BCC alloys exhibit high hydrogen capacities under ambient conditions but store hydrogen via a transition between monohydrides and dihydrides. Because the monohydrides do not contribute to reversibility, it acts as a “dead-end” phase, limiting the reversible hydrogen capacity. In V–Ti–Cr alloys, Cr addition has been reported to increase the reversible hydrogen capacity by reducing the hydrogen content of the monohydrides, although the detailed mechanism remains unclear. In this context, we focused on Nb, which forms a BCC solid solution similar to V and exhibits comparable thermodynamic behavior toward hydrogen, but shows a different trend in lattice parameter variation upon alloying. First, among various binary Nb alloys (with Ti, V, Zr, Mo, Hf, Ta and W), Nb–Mo alloys were found to show increased the reversible hydrogen capacity with increasing Mo content. This improvement is attributed to a decrease in the hydrogen content of the monohydrides, while the dihydrides maintained nearly constant hydrogen content. These variations were attributed to the fact that the hydrogen-hydrogen distance in the dihydrides remained above the empirical lower limit, whereas the thermal stability of the monohydrides decreased. To further enhance the reversible hydrogen capacity at around 40 °C, Ti was additionally alloyed with Nb–Mo alloys. Mo helps reduce the hydrogen content of monohydrides, while Ti suppresses the increase in plateau pressure caused by Mo, keeping the pressure range practical. As a result, the reversible hydrogen capacity increased with both Mo and Ti additions, again due to the reduction in hydrogen content of monohydrides. Neutron diffraction and Reverse Monte Carlo (RMC) modeling of deuterated Nb–Mo monohydrides revealed no change in hydrogen site types upon Mo addition, but a decrease in deuterium site occupancy. The deuterium atoms were randomly distributed among Nb and Mo atoms, suggesting that hydrogen forms delocalized bonding interactions with the metallic matrix rather than site-specific chemical bonds. In conclusion, the reversible hydrogen capacity of Nb-based BCC solid solution alloys can be effectively enhanced by appropriate addition of Mo and Ti, mainly through a decrease in the hydrogen content and the thermal stability of the monohydrides.doctoral thesi

UAV 中心の空中エッジ向けモバイル オフロード: より軽量、高速、かつより回復力のあるネットワークを実現

室蘭工業大学Muroran Institute of Technology博士（工学）Unmanned aerial vehicles (UAVs) are increasingly utilized for surveillance and environmental monitoring, driven by the growing need for real-time data processing in complex and dynamic scenarios. However, their limited processing capacity and energy constraints pose significant challenges for locally executing latency-sensitive and computationally intensive tasks. Traditional cloud offloading incurs substantial transmission delays and communication overhead, making it impractical. Offloading tasks to nearby edge servers is a viable solution to address these issues. This dissertation investigates the critical challenge of offloading tasks to ground-edge servers, focusing on the impact of information availability on decision making and task success. Specifically, I explore three key aspects of offload delay optimization: (1) under completely known information, (2) under partially known information, and (3) under completely unknown information. By developing models and conducting simulations for each scenario, this research offers insights into optimizing task offloading strategies for UAVs, enhancing their operational efficiency in aerial surveillance. The findings contribute to the advancement of mobile computing in UAV applications, providing a framework for effective decision-making in resource-constrained environments.無人航空機（UAV）は、複雑で動的なシナリオにおけるリアルタイムデータ処理の必要性の 高まりを背景に、監視や環境モニタリングでの利用がますます進んでいます。しかし、UAV の限られた処理能力とエネルギー制約により、遅延に敏感で計算負荷の高いタスクをロー カルで実行するには大きな課題が伴います。従来のクラウドオフロードは、伝送遅延や通信 コストが大きいため、実用的ではありません。一方、近隣のエッジサーバーへのタスクオフ ロードは、これらの問題を解決する有効な手段となります。 本論文では、地上エッジサーバーへのタスクオフロードにおける重要な課題を調査し、情報 の可用性が意思決定やタスク成功に与える影響に焦点を当てます。特に、以下の3 つの観点 からオフロード遅延の最適化について検討しています：(1) 全ての情報が完全に知られて いる場合、(2) 情報が部分的にしか知られていない場合、(3) 情報が全く知られていない 場合。 それぞれのシナリオに対してモデルを構築し、シミュレーションを実施することで、本研究 はUAV のタスクオフロード戦略を最適化するための洞察を提供し、空中監視における運用 効率を向上させます。本研究の成果は、UAV アプリケーションにおけるモバイルコンピュー ティングの進展に貢献し、資源が制約された環境での効果的な意思決定の枠組みを提供し ます。doctoral thesi

Water injection in underground coal gasification with a horizontal hole: A strategy to prevent steel pipe rupture and enhancing hydrogen production reaction

Underground Coal Gasification (UCG) is a technology that enables the extraction of coal energy by converting coal seams into syngas, which mainly consists of H2, CO, and CH4. During UCG, the temperature in the reaction zone can exceed 1300 °C, raising concerns regarding the potential melting of the steel pipes used for oxidant injection. To mitigate this issue, this study investigated the use of water as an injection agent. Water injection serves two key purposes: cooling the injection pipe and enhancing H2 production. To examine the effects of water injection on temperature in gasification zone and product gas composition, a UCG model experiment was conducted. The results show that water injection effectively inhibit melting pipe by decreasing the temperature in the gasification zone without compromising H2 production, although the CO concentration decreases and the CO2 concentration increases. Additionally, the energy recovery loss due to water injection can be estimated based on the amount of water injected, as the heat loss from water evaporation is the dominant factor. These findings demonstrate that water injection is a viable strategy for preventing pipe melting while enhancing H2 production in UCG processes.journal articl

電場変調分光法を用いたπ共役系有機半導体および蛍光プローブ分子の電子状態に関する研究

室蘭工業大学博士（工学）有機半導体および蛍光プローブ分子は、有機エレクトロニクス、有機光エレクトロニクス、太陽電池、バイオイメージング、蛍光センサーなどへの応用が期待されており、それらの電子状態を理解することは基本的に重要である。電子状態を特徴づけるパラメーターとして分極率および電気双極子モーメントが知られており、これらのパラメーターは電場や光に対する分子の挙動を理解する上で重要である。これらのパラメーターに関する情報を得る最も強力な手法の一つが電場変調分光法であり、励起状態と基底状態の間の双極子モーメントや分極率の変化を実験的に決定できる。双極子モーメントは光励起にともなう電荷移動・電荷分離を定量的に示す指標として重要であり、分極率の値は分子軌道の空間的な広がりに関する情報を与える。本論文では有機半導体分子PTCDIおよび複数の蛍光プローブ分子について研究を行った。 PTCDIは、π共役電子系をもつ化合物であり高い電子移動度と大きなモル吸収係数を特徴とするn型有機半導体分子である。また光電子デバイス、有機薄膜トランジスタ、センサー、有機太陽電池の作成などに広く応用されている分子である。自己組織化によりナノワイヤー/ナノファイバーなどの超分子系を形成し、光触媒活性を示すことも知られている。本研究ではPTCDI-C8の電場変調スペクトルを測定し、励起子の非局在化メカニズムについて研究を行った。Excimer-like蛍光バンドにおける分極率の変化量がモノマー分子に比べて大きいことを明らかにし、複数のPTCDI-C8分子の間でコヒーレントなエネルギー移動が起きていることを示唆する結果を得た。 BODIPYおよびBOPHY誘導体は、可視光領域から近赤外光領域にわたる蛍光を示す熱的・光化学的安定性に優れた蛍光プローブ分子として知られている。これらの特性により、バイオイメージング、蛍光センシング、光線力学療法、および有機発光ダイオードなど幅広い分野での応用が期待されている。本研究ではBODIPY誘導体の電場吸収スペクトルを測定し、その解析から励起状態と基底状態間の分極率や双極子モーメントの変化を求めた。さらにBOPHY誘導体が示すパラメーターの比較から、電子状態の置換基効果について考察した。 以上、本論文では、電場変調分光法を用いることにより、有機半導体分子の励起子輸送メカニズムを明らかにし、蛍光プローブ分子の電子状態を特徴づけるパラメーターを決定した。本研究で得られた新たな知見は、これらの機能性分子を諸分野に応用するうえで有用であると考えられる。Understanding the electronic states in organic semiconductors and fluorescence probe molecules is important for advancing their applications in organic electronics, organic optoelectronics, photovoltaics, bioimaging, and fluorescence sensor. The polarizability and dipole moment are parameters which characterize the electronic states, and they are also fundamental properties of molecules which play crucial roles in understanding the behavior of molecules in response to electric fields and light. One of the most powerful methods to obtain information on these molecular parameters is an electric field modulation spectroscopy. By using this technique, we can experimentally determine the change in dipole moment and polarizability between the excited and ground states. The dipole moment is important as the measure of the charge transfer and charge separation associated with photoexcitation. The polarizability can provide with information on the spatial extension of the molecular orbitals in the excited state. PTCDI is a π-conjugated n-type organic semiconductor molecule widely utilized in development of optoelectronic devices, organic thin-film transistors, sensors, organic solar cells, and nanowires/nanofibers due to its high electron mobility and large molar absorption coefficient. PTCDI can form supramolecular systems such as nanofibers via self-assembly, and the aggregated PTCDI has photocatalytic activity. Electric field modulation spectroscopy was used to study the mechanism of the exciton delocalization in the aggregated system of PTCDI-C8. The larger change in the polarizability was observed for the excimer-like fluorescence band than that for the monomer fluorescence. This result demonstrates that coherent energy transfer occurs among PTCDI-C8 molecules leading to the exciton delocalization. BODIPY and BOPHY dyes are highly versatile class of fluorophores which have excellent thermal and photochemical stability, and fluorescence characteristics across the visible and near-infrared regions, making them widely applicable in bioimaging, sensing, photodynamic therapy, optoelectronic devices, and organic photovoltaic cells. From the analysis of the electroabsorption spectra of the BODIPY and BOPHY derivatives, the change in polarizability and dipole moment between the excited and ground states was obtained. The substitution effect on the electronic states was discussed from the difference in the dipole moment and polarizability of molecules having different substitution groups In this thesis, using electric field modulation spectroscopies, the electronic states and energy transfer mechanism of organic semiconductor and fluorescence dye molecules have been studied. The insights gained in this thesis are critical for expanding the horizon of the applications of these molecules in their respective fields.doctoral thesi

An Analysis of Student Responses to English Communication Classes during COVID

This paper presents the results from a study focused specifically on EFL classes that used a communicative language teaching (CLT) approach. The aim of the study was to explore students’ attitudes to both online and in-classroom communicative English language learning, and subsequently consider what implications these would have for student learning and teacher pedagogy. As part of a questionnaire survey administered to 327 non-English major students at a science and engineering university, an open response section was included in the survey. Participants were asked to write about their overall experience of learning communicative English both online and in the classroom. A total of 43 valid responses were received. Summative content analysis was used to identify eight main themes from the written data: Technical issues; Worksheets; Breakout rooms – benefits; Breakout rooms – problems; Online advantages; Classroom advantages; Health; and Preferences. As with the questionnaire data, analysis of the written responses showed that students clearly prefer in-class language learning. Students considered the classroom-based pedagogy to be more effective, particularly in terms of peer involvement and interaction. Findings from this study have significant implications for how students experience communicative language learning and how teachers can best enhance this experience.departmental bulletin pape

Framework for identifying non–van der Waals two-dimensional materials

Two-dimensional (2D) materials are categorized into van der Waals (vdW) and non-vdW types. However, no relevant descriptors have been proposed for identifying the latter. Here, we identify the non-vdW 2D materials by calculating the thickness-dependence of total energy of thin films trun- cated from surfaces. The non-vdW 2D materials exhibit a deviation from the law of finite-thickness excess energy (FTEE) inverse to the number of layers in the monolayer limit. This framework is applied to single-component systems, which successfully identifies non-vdW 2D materials including silicene and goldene that are overlooked in the dimensional analysis of the parent crystals. The anomalies of FTEE at specific thickness are found in Pb and Ga thin films, supporting the creation of plumbene and gallenene. The framework is also applied to multi-component systems with cubic and hexagonal symmetry (zincblende- and fluorite-types and tungsten carbide- and PtSbBa-types, respectively). Among them, several non-vdW 2D materials are identified to be dynamically stable. Structural transformation from hexagonal to almost tetragonal symmetry is observed in metallic TiS and ZrTe thin films. Our framework is useful for identifying non-vdW 2D materials.journal articl

Highly confined out-of-plane corner states in air-hole type topological photonic crystal fiber

Out-of-plane corner states are found in air-hole type square lattice topological photonics crystal fiber (PCF) based on highly nonlinear glass. While, for the unit cell of photonic crystal (PC) without lattice shift (UC1), the parities of Bloch modes under the first photonic bandgap (PBG) are reversed between and X points in the Brillouin zone, the parities are preserved for the unit cell with lattice shift (UC2). This is opposite compared with the case of pillar type topological PCFs. Based on these results, out-of-plane optical states of the fiber with three UC1 and one UC2 regions are investigated, and two highly confined corner states are found at the corner of UC1 and UC2 interface. The corner states are not found by just flipping unit cell, namely, for three UC2 and one UC1 PC corner (for pillar type PCF, the corner states were found for this placement). Wavelength dependence of effective area and the confinement loss of the corner states are investigated in detail, and by increasing the number of layers, the confinement loss can be dramatically reduced. These new fibers may be applied to nonlinear optical applications, such as wavelength conversion and single photon generation.journal articl

流動化処理土の圧密及び透水特性に関する実験的研究

室蘭工業大学博士（工学）地盤工学において，透水性は重要な役割を果たしており，土構造物の強度，変形，および長 期的な性能に直接影響する．流動化処理土（LSS）は持続可能な埋め戻し材として大きな注目を 集めているが，低透水性を必要とするプロジェクトでの適用に関する研究はまだ限られている． 本研究は，低透水性裏込め材としての適性を評価するため，一連の一次元圧密・透水試験を実 施し，LSS の圧密・透水特性を検討したものである．試験条件は，スラリー密度を1.216，1.280， 1.344 g/cm³，セメント添加量を100 kg/m³，繊維材添加量を0 および10 kg/m³，養生期間を 7，28，56，120 日とした． 本研究では，異なる泥水密度で作製されたLSS の圧密・透水特性を比較するとともに，繊維 材混合の影響を検討した．その結果，LSS の圧密係数は，泥水密度および繊維材の混合量に伴い 増加すること，特に泥水密度が主要な影響因子であることが示された．繊維材の混合量は，圧 密係数に比較的小さい影響を及ぼす一方で，LSS の圧密係数は，圧密圧力の増加とともに全体 的に減少し，圧密降伏応力に対応する明確な変曲点が示された．また，LSS の透水係数は，泥水 密度，繊維材の混合量，および供試体の初期間隙比と密接に関連しており，泥水密度および繊 維材の混合量が増加することで透水係数が著しく低下することが明らかとなった．LSS の透水 係数に及ぼす繊維材の影響は相対的に小さいものの，繊維材の混合によりLSS の遮水性が向上 することが示された．本研究において， LSS の平均透水係数は約3×10⁻⁶ cm/s であり，高い 遮水性を有することが示された． さらに，養生期間がLSS の圧密および透水特性に与える重要な影響が示された．本研究では， NSF-Clay を母材とするLSS において，養生期間が長くなるにつれて圧密係数が増加し，透水係 数が減少する傾向が見られた．LSS の圧密係数は圧力の増加とともに全体的に減少するが，こ の減少は養生期間が長いほど顕著であり，繊維材の影響は比較的小さいものであった．一方で， LSS の透水係数は圧密圧力の増加に伴い減少し，9.8〜1256 kN/m²の圧力範囲で1〜2 桁低下す る傾向が見られた．繊維材と比較して，養生期間はLSS の透水性により大きな影響を及ぼすこ とが明らかにされた． また，本研究ではLSS と母材であるNSF-Clay の圧密および透水特性を比較・検討した結果， LSS はNSF-Clay に比べて大きな圧密係数，小さい透水係数，および安定した間隙比を示すこと が明らかとなった．これは，セメント系固化材の添加により，軟弱粘土のマトリックス内の粒 子配列が大きく変化し，より密なLSS 構造が形成されるためと考えられる． 結論として，本研究はLSS を圧密および透水特性に関する地盤工学に応用するための実験的 な知見を提供するとともに，今後の研究の基盤を築いた．今後の研究では，繊維材の長さが圧 密および透水特性，さらにはLSS の全体的な力学特性に与える影響を評価し，工学的応用にお ける性能をさらに最適化することに焦点を当てる必要がある．Permeability plays a crucial role in geotechnical engineering, directly affecting the strength, deformation, and long-term performance of soil structures. Liquefaction stabilized soil (LSS) is of great interest as a sustainable backfill material, but research on its application in projects requiring low permeability is still limited. This study discusses the consolidation and permeability property of LSS conducted to a series of 1-D consolidation and permeability tests to assess its suitability as a low-permeability backfill material. Test conditions were set at slurry densities of 1.216, 1.280, and 1.344 g/cm³, cement content of 100 kg/m³, fiber content of 0 and 10 kg/m³, and curing periods of 7, 28, 56, and 120 days. In this study, the consolidation and permeability characteristics of LSS at different slurry densities and the effect of fiber addition were investigated. Based on the test results, it is found that the coefficient of consolidation of LSS increases significantly depending on both slurry density and fiber content. Especially, the effect of slurry density is considered the primary influencing factor. The overall trend of LSS’s coefficient of consolidation decreased with increasing pressure with a notable inflection point corresponding to the consolidation yield stress. On the other hand, it is revealed that the coefficient of permeability of LSS is closely related to slurry density, fiber content, and the initial void ratio of the specimens. That is, as slurry density and fiber content increase, the coefficient of permeability decreases significantly. And while fiber content has a relatively minor influence among these factors, adding fiber enhances LSS’s impermeability. In this study, the average coefficient of permeability of LSS was approximately 3×10⁻⁶ cm/s, indicating high impermeability. Moreover, in this study, it is revealed that the significant influence of curing time on the consolidation and permeability properties of LSS made by NSF-Clay as base material. The coefficient of consolidation increases with curing time, while the coefficient of permeability decreases. Permeability decreases by one to two orders of magnitude within a pressure range of 9.8 to 1256 kN/m², with curing time exerting a more significant influence than fiber content. This study also compared the consolidation and permeability properties of LSS with those of the base material, NSF-Clay, and it is found that LSS exhibits a higher coefficient of consolidations, lower coefficient of permeability, and a stable void ratio compared to NSF-Clay. The addition of a cement stabilizer significantly alters the internal particle arrangement within the soft clay matrix, resulting in a denser LSS structure. In conclusion, this study not only provides experimental knowledge for the application of LSS in geotechnical engineering related to consolidation and permeability property but also lays a foundation for future research. Future studies should focus on evaluating the effects of various fiber lengths on the consolidation and permeability properties and the overall mechanical behavior of LSS to further optimize its performance in engineering applications.doctoral thesi

An Optimization Method for Coil Design Problems Based on Physarum Solver and Evolutionary Computation

This paper presents a new optimization approach for coil design problems. In conventional evolutional approaches, disconnected conductor geometries are included in the search space, and this feature makes it difficult to find acceptable optimization results. Thus, in the present method, coil design problems are treated as optimum routing ones. In order to solve the routing problem, the physarum solver is used, and resultant routes obtained by the physarum solver are controlled on the basis of evolutionary computations. The present method is applied to the design problems of simple line coil and planar inductor. It is shown that the present method can effectively find coil designs with better performance in comparison with a conventional evolutional approach that do not have any technique to generate surely connect geometry.journal articl

北海道におけるニホンジカの自動個体識別と検出：農業保護のためのモジュール軽量化

室蘭工業大学博士（工学）この研究では、ディープラーニングとカメラトラップ技術を用いて、北海道に生息するニホンジカに焦点を当て、野生生物のモニタリングと保護活動を強化する方法について取り組んだ。人の手による野生生物識別の課題に着目し、ディープラーニングモデルを用いて種を分類・識別する完全自動化システムを提案した。この研究では、まず、EfficientNetB0とVGG16という2つの畳み込みニューラルネットワーク（CNN）の複数種分類における性能を評価し、EfficientNetB0が精度、適合率、再現率においてVGG16を上回ることを発見した。このモデルは80%以上の精度を示し、トップ5の精度では90%以上を達成しており、野生生物モニタリング用途に非常に効果的であることを示した。 次なる研究として、野生生物モニタリングで多く利用される既製品の3つのカメラトラップの性能について評価し、ニホンジカの検出に最も効果的である製品がソーラーパワー4kトレイルカメラであることを明らかにした。この研究では、生態学研究におけるカメラトラップの性能を最適化するために、カメラのキャリブレーションと歪み補正が重要であることを強調しています。 さらに，本研究の重要なトピックとして、トリプレット損失関数を用いたサイアミーズネットワークアーキテクチャを用いた個々のエゾシカの識別にも焦点を当てました。複数のモデルを適用し比較した結果、ResNet152モデルは最も成功し、斑点パターンなどの特徴に基づいて個々のエゾシカを分類することで高い精度を達成しました。本研究ではまた、人間と野生生物の軋轢、特に北海道におけるエゾシカとクマによる農業被害についても調査した。これを緩和するために、Raspberry Piに展開されPIRセンサーを統合したYOLOv8-nanoモデルを使用して、エゾシカ検知システムを開発した。このシステムは、電子メールとLINEアプリを介して地域住民にリアルタイムの警告を提供し、音声通知も提供できる。ブザーによるシカの抑止効果はいま一つであったが、警告システムはシカの活動を監視することに成功し、保全戦略のための貴重な知見を提供した。将来の課題として、農業地域における野生生物管理の改善のために、ドローンなどの代替抑止策を探求するためのさらなる研究が推奨される。This study explores the use of deep learning and camera trap technologies to enhance wildlife monitoring and conservation efforts, with a focus on Sika deer in Hokkaido, Japan. It addresses the challenges of manual wildlife identification and proposes a fully automated system to classify and identify species using deep learning models. The study evaluates the performance of two Convolutional Neural Networks (CNNs), EfficientNetB0 and VGG16, for multi-species classification, finding that EfficientNetB0 outperformed VGG16 in terms of accuracy, precision, and recall. The model demonstrated over 80% accuracy and achieved a top-5 accuracy of over 90%, making it highly effective for wildlife monitoring applications. Additionally, the research assesses the performance of three camera traps, highlighting the Solar-Powered 4k-Trail camera as the most effective in detecting Sika deer. The study emphasizes the importance of camera calibration and distortion correction for optimizing camera trap performance in ecological research. A key part of the study also focused on the identification of individual Sika deer using a Siamese Network Architecture with triplet loss functions. The ResNet152 model was the most successful, achieving high accuracy in classifying individual Sika deer based on distinctive features like spot patterns. The study also investigates human-wildlife conflict, particularly the agricultural damage caused by Sika deer and bears in Hokkaido. To mitigate this, a Sika deer detection system was developed using the YOLOv8-nano model deployed on a Raspberry Pi, integrated with a PIR sensor. The system provided real-time alerts to local residents via email and the LINE application, alongside audio notifications. While the buzzer's effectiveness in deterring deer was mixed, the alert system proved successful in monitoring deer activities, offering valuable insights for conservation strategies. Further research is recommended to explore alternative deterrents, such as drones, for improving wildlife management in agricultural areas.doctoral thesi