Judul: Relationship between Stress Level, Physical Activity and Sugar Consumption in Undergraduate Students of IPB University
Abstrak: Stres merupakan kondisi ketika seseorang mengalami masalah atau tekanan yang berdampak pada kondisi fisik dan psikis. Penelitian sebelumnya menemukan bahwa stres berasosiasi dengan aktivitas fisik dan konsumsi gula. Namun, penelitian tersebut belum dilakukan di Indonesia. Penelitian ini bertujuan menguji hubungan antara tingkat stres dengan aktivitas fisik dan konsumsi gula pada mahasiswa sarjana di IPB University. Data dikumpulkan dari hasil pengisian kuesioner oleh 400 mahasiswa sarjana di IPB University. Perceived Stress Scale (PSS-10) digunakan untuk mengukur tingkat stres responden, International Physical Activity Questionnaire (IPAQ) digunakan untuk mengukur aktivitas fisik responden, dan Food Frequency Questionnaire (FFQ) digunakan untuk mengukur konsumsi gula. Data dianalisis dengan perangkat lunak R Studio. Korelasi antara tingkat stres, aktivitas fisik, dan konsumsi gula dianalisis dengan uji korelasi Spearman. Studi ini menunjukkan bahwa mahasiswa sarjana IPB University memiliki tingkat stres yang sedang (19,71±5,28). Tingkat stres tidak berkorelasi signifikan dengan aktivitas fisik (? = -0,006, p-value = 0,95) dan konsumsi gula (? = 0,045, p-value = 0,359)., Stress is a condition when a person experiences problems or pressures that have an impact on physical and psychological conditions. Previous studies have found that stress is associated with physical activity and sugar consumption. However, these studies have not been conducted in Indonesia. This study aims to examine the relationship between stress levels with physical activity and sugar consumption in undergraduate students at IPB University. Data were collected from questionnaires completed by 400 undergraduate students at IPB University. Perceived Stress Scale (PSS-10) was used to measure respondents' stress level, International Physical Activity Questionnaire (IPAQ) was used to measure respondents' physical activity, and Food Frequency Questionnaire (FFQ) was used to measure sugar consumption. Data were analyzed with R Studio software. The correlation between stress levels, physical activity, and sugar consumption were analyzed with the Spearman correlation test. This study showed that IPB University undergraduate students had moderate stress levels (19.71±5.28). Stress level was not significantly correlated with physical activity (? = -0.006, p-value = 0.95) and sugar consumption (? = 0.045, p-value = 0.359).
Keyword: FFQ, PSS, IPAQ

Judul: Correlation between Stress Level, Physical Activity, Sleep Duration, Eating Habit, and Nutritional Status in Final Year Students
Abstrak: Masalah yang sering ditemui pada mahasiswa tingkat akhir adalah stres karena mengerjakan skripsi, sehingga memengaruhi pola makan, penurunan aktivitas fisik, dan durasi tidur yang pendek. Penelitian ini bertujuan menganalisis hubungan stres, aktivitas fisik, durasi tidur, dan pola makan terhadap status gizi pada mahasiswa IPB tingkat akhir. Penelitian dilakukan pada bulan Mei–Juni 2023 pada 55 mahasiswa dengan studi cross sectional. Hasil penelitian menunjukkan sejumlah 34,5% mahasiswa mengalami stres tingkat ringan, 58,2% aktivitas fisik ringan, 80% mahasiswa memiliki durasi tidur kurang, dan sebagian besar mahasiswa memiliki rata-rata tingkat kecukupan gizi defisit. Hasil analisis korelasi rank Pearson menunjukkan terdapat hubungan signifikan bersifat positif antara aktivitas fisik dengan status gizi, dan hubungan signifikan bersifat negatif antara tingkat kecukupan energi, tingkat kecukupan protein, tingkat kecukupan lemak, dan tingkat kecukupan karbohidrat dengan status gizi (p<0,05). Tidak terdapat hubungan signifikan antara tingkat stres dan durasi tidur dengan status gizi (p>0,05)., The problem that is often encountered in final year students is stress from working on thesis, which affects eating habit, decreased physical activity, and short sleep duration. This study aims to analyze the relationship between stress, physical activity, sleep duration, and eating habit on the nutritional status of final year IPB students. The research was conducted in May–June 2023 on 55 students with a cross sectional study. The results showed that 34,5% of students experienced mild levels of stress, 58,2% had light physical activity, 80% of students had less sleep duration, and most students had an average deficit nutritional adequacy level. The results of Pearson's rank correlation analysis showed that there was a significant positive relationship between physical activity and nutritional status, and a significant negative relationship between energy adequacy level, protein adequacy level, fat adequacy level, and carbohydrate adequacy level with nutritional status (p<0,05). There is no significant relationship between stress levels and sleep duration with nutritional status (p>0,05).
Keyword: food consumption, nutritional status, physical activity, sleep duration, stress level

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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