Judul: Efforts to Reduce Weight Loss on Chicken Karaage Production with PDCA Approach and Pick Up Observation on Some Product Weights at PT XYZ
Abstrak: PT XYZ merupakan industri pangan yang mengembangkan beberapa produk olahan daging ayam, salah satunya adalah chicken karaage. Berdasarkan data di perusahaan, PT XYZ masih mengalami kendala yang ditandai dengan tingginya persentase loss thawing sebesar 5,44%. Penyusutan bobot tersebut dapat berpengaruh pada jumlah produk yang dihasilkan. Oleh karena itu, penelitian ini bertujuan menurunkan susut bobot bahan serta mencari tahu faktor-faktor yang berpengaruh terhadap susut bobot dengan pendekatan PDCA (Plan, Do, Check, Action). Langkah perbaikan yang dilakukan adalah menggunakan metode pembekuan cepat (Individually Quick Freezing), meninimalisasi kejadian holding time selama pengumpulan bahan baku, dan perlakuan thawing pada suhu chilling room (13,2 °C). Hasil perbaikan menunjukkan persentase total susut bobot menurun menjadi 2,70% yang terdiri atas persentase susut bobot pada beberapa tahapan, yaitu setelah pembekuan (1,79%), penyimpanan sementara (0,28%), dan setelah thawing (0,62%). Selain susut bobot, pengamatan juga dilakukan pada %pick up predust, batter, breader, dan frying. Hasil analisis statistik menunjukkan kelompok berat daging 28–32 gram berpengaruh nyata (p < 0,05) terhadap %pick up predust pada taraf signifikansi 0,05. Sedangkan pada kelompok berat daging 18–22 gram, PT XYZ is a food industry that develops several processed chicken meat products, one of which is chicken karaage. Based on data from the company, PT XYZ is still experiencing constraints characterized by a high percentage of thawing loss of 5,44%. Depreciation of such weights can affect the number of products produced. Therefore, this study aimed to reduce the weight of ingredients and found out the factors that affect thawing loss with PDCA (Plan, Do, Check, Action) approach. The corrective steps are to use the Method of Rapid Freezing (Individually Quick Freezing), initialize the occurrence of holding time during the collection of raw materials, and thawing treatment at chilling room temperature (13,2 °C). The results showed the percentage of total weight loss decreased to 2,70% consisting of a percentage of weight loss at several stages, namely after freezing (1,79%), temporary storage (0,28%), and after thawing (0,62%). In addition to weight loss, observations were also made on %pick up predust, batter, breader, and frying. The results of statistical analysis showed that the meat weight group of 28–32 grams had a noticeable effect (p < 0,05) on %pick up predust at a significance level of 0,05. While in the meat weight group 18–22 grams and 23–27 grams showed no noticeable influence (p > 0,05).
Keyword: Chicken karaage, pembekuan, pendekatan PDCA, susut bobot, thawing, Chicken karaage, freezing, PDCA approach, thawing, weight loss

Judul: Implementation of PDCA (Plan, Do, Check, Action) Cycle to Reduce the Weight Loss of Spicy Wing Product at PT XYZ
Abstrak: PDCA (Plan, Do, Check, Action) adalah metode yang umum digunakan oleh perusahaan untuk mengidentifikasi permasalahan dan penyebabnya. Penelitian secara formal mengenai weight loss saat proses produksi dengan sampel yang besar dan proses berkesinambungan di industri pengolahan daging ayam spicy wing belum pernah dilakukan. Penelitian ini bertujuan mengkaji weight loss saat proses produksi, menganalisis faktor penyebab weight loss, dan membuat standard kombinasi proses yang paling optimal dalam produksi spicy wing di PT XYZ. Penelitian dilakukan dengan tahap Plan (identifikasi masalah, spesifikasi masalah, dan pengumpulan data), tahap Do (analisis data, pembuatan kesimpulan tentatif, dan pemeriksaan kesimpulan statistik), tahap Check (melakukan percobaan), dan tahap Action (melakukan tindakan perbaikan dan mempertahankan hasil perbaikan). Penentuan faktor penyebab weight loss dilakukan dengan metode PDCA dan dibantu dengan teknik GKM (Gugus Kendali Mutu) yang berisikan manajer, supervisor, dan leader pada masing-masing divisi. Hasil penelitian menunjukkan perlakuan pembekuan dengan Individual Quick Freezing (IQF) pada sampel middle wing dan wing stick dapat menurunkan thawing loss menjadi 0,68±0,19% dibandingkan perlakuan Blast Freezer (BF) dengan thawing loss sebesar 2,84±0,39%. Metode IQF ini juga menghasilkan saving cost sebesar Rp 1.195.200,-/Order Kerja Produksi (OKP). Kata kunci: freezing, GKM, PDCA, spicy wing, weight loss., PDCA (Plan, Do, Check, Action) is a method commonly used in company to identify problems and it causes, to conduct the improving and controlling as well as to maintain the produced product quality. Formal the research topic about weight loss in production line with a large sample and continuous process in the chicken meat (spicy wing) processing industry has never been done. This research aimed to study weight loss in line production, to analyze the factors behind weight loss and create the most optimal process combination standard in the production of spicy wings at PT XYZ. The research was carried out with 4 stages. Plan (problem identification, problem specification and data collection), Do (data analysis, formulation of provisional conclusions and verification of statistical conclusions), Check (realization experiences), and Action (take corrective action and maintain improvement results). The determination of the factors that caused weight loss was done using PDCA method and supported by Quality Control Group (QCG) technique involving managers, supervisors, and leaders of each division. The results showed that freeze treatment with Individual Quick Freezing (IQF) on samples middle wing and wing stick was able to reduce thaw loss to 0.68±0.19% than the freez treatment with Blast Freezing (BF) with thaw loss 2.84±0.39%. IQF method was able to gain saving cost Rp 1.195.200,-/Production Work Order (PWO). Keywords: freezing, PDCA, spicy wing, QCG, weight loss.
Keyword: Freezing, PDCA, QCG, Spicy Wing, Weight loss

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology