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Kullanım alanları

PIF-CODAS

PiF-CODAS - CODAS yönteminin Picture uzantısı

Picture uzaklık tabanlı sıralama - Resim Bulanık Küme (RBK: μ, η, ν; μ+η+ν ≤ 1)

Formül adımları

Analiz motorunun yöntem bildirimindeki (manifest F.steps) adımlar; raporlardaki formüllerle aynı kaynaktır.

  1. Adım 1 — Picture bulanık karar matrisini X̃ = [x̃_ij]_{m×n} oluştur; her hücre x̃_ij = ⟨μ_ij, η_ij, ν_ij⟩ PiFN koşulunu sağlar; reddetme π_ij = 1−μ_ij−η_ij−ν_ij. Kriter yönü PiFN kodlamasından önce dilbilimsel dönüşümde işlenir.

    x̃ij=⟨μij,ηij,νij⟩;μij+ηij+νij≤1;πij=1−μij−ηij−νij(Cuong2013PiFSDef1;Chowdhury2025§3.2Eq.(1)−(2))
    LaTeX x̃_ij = ⟨μ_ij, η_ij, ν_ij⟩; μ_ij+η_ij+ν_ij ≤ 1; π_ij = 1−μ_ij−η_ij−ν_ij (Cuong 2013 PiFS Def 1; Chowdhury 2025 §3.2 Eq.(1)-(2))
  2. Adım 2 — Ağırlıklı Picture bulanık karar matrisi q̃_ij = v̄_j ⊗ x̃_ij; Cuong 2013 Eq.(4) PiFN çarpımı.

    LaTeX q̃_ij = v̄_j ⊗ x̃_ij = ⟨μ_v_j · μ_x_ij, η_v_j + η_x_ij − η_v_j · η_x_ij, ν_v_j + ν_x_ij − ν_v_j · ν_x_ij⟩ (Cuong 2013 Eq.(4))
  3. Adım 3 — Picture bulanık negatif-ideal çözüm. Bu manifest: ñs_j = ⟨min μ, max η, max ν⟩ (yarar kriterinde alternatifler arasında her PiFN bileşeninde en kötü). Simic 2021 Eq.(27) alternatif: ⟨min μ, min η, max ν⟩.

    ñsj=⟨miniμq̃ij,maxiηq̃ij,maxiνq̃ij⟩(Chowdhury2025§3.4Eq.(22),canonicalreading;cf.Simic2021Eq.(27)variantinL.alternativeformulationsknown)
    LaTeX ñs_j = ⟨min_i μ_{q̃_ij}, max_i η_{q̃_ij}, max_i ν_{q̃_ij}⟩ (Chowdhury 2025 §3.4 Eq.(22), canonical reading; cf. Simic 2021 Eq.(27) variant in L.alternative_formulations_known)
  4. Adım 4 — Her alternatif için negatif-ideale (i) Öklid PiFN uzaklığı E_i ve (ii) Taksisürücü PiFN uzaklığı T_i; kriterler ve PiFN bileşenleri (μ, η, ν) üzerinden toplanır. Büyük değer = en kötüden daha uzak = daha iyi.

    Ei=√(Σj=1n[(μq̃ij−μñsj)²+(ηq̃ij−ηñsj)²+(νq̃ij−νñsj)²])(Eq.(23));Ti=Σj=1n[|μq̃ij−μñsj|+|ηq̃ij−ηñsj|+|νq̃ij−νñsj|](Eq.(24))
    LaTeX E_i = √( Σ_{j=1}^n [(μ_{q̃_ij} − μ_{ñs_j})² + (η_{q̃_ij} − η_{ñs_j})² + (ν_{q̃_ij} − ν_{ñs_j})²] ) (Eq.(23)); T_i = Σ_{j=1}^n [|μ_{q̃_ij} − μ_{ñs_j}| + |η_{q̃_ij} − η_{ñs_j}| + |ν_{q̃_ij} − ν_{ñs_j}|] (Eq.(24))
  5. Adım 5 — Bağıl-değerleme matrisi h_ik; eşik göstergesi ψ (|E_i − E_k| üzerinde). Her satırı topla → H_i; azalan H_i ile sırala. τ ∈ [0.01, 0.05] (paper §4.1 varsayılan 0.05). ψ(x)=1 if |x|≥τ else 0.

    hik=(Ei−Ek)+ψ(Ei−Ek)·(Ti−Tk),ψ(x)=1if|x|≥τelse0(Eq.(26)−(27));Hi=Σk=1mhik(Eq.(28));rankbyHidescending
    LaTeX h_ik = (E_i − E_k) + ψ(E_i − E_k) · (T_i − T_k), ψ(x) = 1 if |x| ≥ τ else 0 (Eq.(26)-(27)); H_i = Σ_{k=1}^m h_ik (Eq.(28)); rank by H_i descending

Yöntem ayrıntıları kaynak kütüphanedeki özgün (İngilizce) metindir.

Sezgi

Picture distance-based ranking - Picture Fuzzy Set (PiFS: μ, η, ν; μ+η+ν ≤ 1). Output typically utility (higher value = preferred).

Sonucu okuma: pif-codas extends Keshavarz Ghorabaee et al. 2016 crisp CODAS to Picture fuzzy uncertainty via Cuong 2013 PiFS. For each alternative, computes Euclidean E_i and Taxicab T_i PiFN distances to a negative-ideal reference, then combines them in a relative-assessment matrix h_ik using a threshold indicator ψ that gates the Taxicab tie-breaker. Higher H_i = Σ_k h_ik is better. The dual-distance design with τ-threshold gives partial-compensation behaviour: when alternatives are Euclidean-close (within τ), the Taxicab metric resolves the tie; otherwise Euclidean dominates.

Varsayımlar

  • Decision matrix entries are valid Picture Fuzzy numbers/tuples
  • Underlying crisp method's compensation assumption holds in uncertain space
  • All decision-maker(s) and experts use the same linguistic/uncertainty scale

Ne zaman kullanılmaz

  • Classical data sufficient - use base CODAS directly (avoid unnecessary uncertainty layer)
  • Aggregation operator (PFWA/PFOWA/etc.) not specified - output ambiguous

Sınırlılıklar

  • Assumes: Decision matrix entries are valid Picture Fuzzy numbers/tuples
  • Assumes: Underlying crisp method's compensation assumption holds in uncertain space
  • Assumes: All decision-maker(s) and experts use the same linguistic/uncertainty scale

Sık yapılan hatalar

  • Değer-uzayı ihlali: hesaplamadan önce tüm girişlerin PiFN μ+η+ν ≤ 1 koşulunu sağladığından emin olun.
  • Negatif-ideal konvansiyonu: literatürde tek tip değil. Simic 2021 Eq.(27): ⟨min μ, min η, max ν⟩. Bu manifest: ⟨min μ, max η, max ν⟩ (Chowdhury §4.1 sonuçlarını yeniden ürettiği için). Yeni alanlarda her ikisine duyarlılık analizi öneririz.
  • Eşik τ: paper τ ∈ [0.01, 0.05] verir. LA-JECM'de bu aralıkta sıralama duyarsız (τ=0.01, 0.02, 0.05 doğrulandı).
  • İşlem kanunu varyantı: Simic 2021 Wang 2017 / Liang 2018 PiFN ops kullanır (farklı ⊕, ⊗, λ-üs formülleri). Bu manifest Cuong 2013 standart ops kullanır (Chowdhury 2025 ve manifest ailesi ile tutarlı).

Hesap adımları ve dayanakları

  1. Construct the Picture fuzzy decision matrix X̃ = [x̃_ij]_{m×n} where each entry x̃_ij = ⟨μ_ij, η_ij, ν_ij⟩ is a PiFN satisfying μ_ij+η_ij+ν_ij ≤ 1, with refusal π_ij = 1−μ_ij−η_ij−ν_ij. Criterion-direction is handled at the linguistic-conversion step (Chowdhury 2025 §4.1 Table 6: cost criteria mapped so lower raw values receive higher μ); the resulting PiFN matrix is therefore treated as all-benefit at the algorithm-internal level.

    Dayanak: Chowdhury 2025 §3.2 Eq.(1)-(2); Cuong 2013

  2. Build the weighted Picture fuzzy decision matrix q̃_ij = v̄_j ⊗ x̃_ij via Cuong 2013 Eq.(4) PiFN product: q̃_ij = ⟨μ_v_j · μ_x_ij, η_v_j + η_x_ij − η_v_j · η_x_ij, ν_v_j + ν_x_ij − ν_v_j · ν_x_ij⟩. This is the same weighted matrix used by Chowdhury 2025 PiF-ARAS Table 11 and PiF-WASPAS pre-step.

    Dayanak: Chowdhury 2025 §3.4 Eq.(21); Cuong 2013 Eq.(4)

  3. Identify the Picture fuzzy negative-ideal solution per criterion. CANONICAL CHOICE (this manifest): ñs_j = ⟨min_i μ_{q̃_ij}, max_i η_{q̃_ij}, max_i ν_{q̃_ij}⟩ (worst across alternatives on each PiFN component for a benefit criterion: lowest positive, highest neutrality/ambivalence, highest negative). This convention reproduces Chowdhury 2025 §4.1 reported T1#1 and T10#16. ALTERNATIVE - Simic 2021 Eq.(27) explicit form: ñs_j = ⟨min μ, min η, max ν⟩; documented in L.alternative_formulations_known.

    Dayanak: Chowdhury 2025 §3.4 Eq.(21)-(22); cf. Simic 2021 Eq.(27)

  4. For each alternative i, compute (i) Euclidean PiFN distance to negative-ideal E_i and (ii) Taxicab PiFN distance T_i, summed component-wise across criteria and the three PiFN components (μ, η, ν). Both are non-negative; larger values indicate stronger dominance over the worst case (more desirable).

    Dayanak: Chowdhury 2025 §3.4 Eq.(23)-(24); Keshavarz Ghorabaee 2016 (crisp CODAS distance pair)

  5. Build the relative-assessment matrix h_ik with threshold indicator ψ on |E_i − E_k|; sum each row to H_i and rank alternatives by descending H_i. The threshold τ ∈ [0.01, 0.05] (paper default 0.05 per §4.1) controls whether the Taxicab tie-breaker activates: ψ(x)=1 if |x|≥τ, else 0. Equivalent to: when two alternatives are Euclidean-close, defer to Taxicab; otherwise rely on Euclidean alone.

    Dayanak: Chowdhury 2025 §3.4 Eq.(25)-(28); Keshavarz Ghorabaee 2016 (crisp CODAS relative-assessment)