Judul: Perbedaan Kebiasaan Makan dan Aktivitas Fisik Pekerja Kantor saat WFH dan WFO selama Pandemi Covid-19
Abstrak: Pandemi Covid-19 menyebabkan terbatasnya aktivitas kerja di kantor. Keadaan tersebut membuat terjadinya perubahan gaya hidup pekerja termasuk kebiasaan makan dan aktivitas fisik. Tujuan dari penelitian ini menganalisis perbedaan kebiasaan makan dan aktivitas fisik pekerja saat WFH dan WFO selama pandemi Covid-19 beserta faktor-faktor yang memengaruhinya. Pengambilan data dilakukan secara online melalui Google form. Data kebiasaan makan subjek diambil melalui kuesioner kebiasaan makan yang terdiri atas tiga belas butir pertanyaan data aktivitas fisik subjek diambil menggunakan kuesioner GPAQ. Kebiasaan frekuensi makan per hari, sarapan, konsumsi buah, sayur dan susu lebih tinggi di masa WFH (p<0,05). Kebiasaan konsumsi minuman manis, teh dan/atau kopi, fast food, dan minuman beralkohol lebih tinggi di masa WFO (p<0,05). Tingkat aktivitas fisik subjek lebih tinggi di masa WFH namun tidak berbeda secara signifikan (p>0,05). Usia, jenis kelamin, dan status gizi memiliki hubungan yang signifikan dengan beberapa kebiasaan makan saat WFH dan WFO. Pendidikan terakhir hanya memiliki hubungan yang signifikan dengan beberapa kebiasaan makan saat WFH (p<0,05). Jenis kelamin memiliki hubungan yang signifikan dengan tingkat aktivitas fisik subjek saat WFH (p<0,05)., Covid-19 pandemic led to limited work activities in the office. This situation resulted in changes in workers' lifestyles, including their dietary habits and physical activity. This study aims to analyze workers' differences in dietary habits and physical activity during work-from-home (WFH) and work-from-office (WFO) periods during Covid-19 pandemic, along with the influencing factors. Data collection was conducted online through Google form. Subjects' dietary habits were collected through 13-item questionnaire. While the subjects' physical activity was obtained using GPAQ. The frequency of daily meals, breakfast, fruit consumption, vegetable consumption, and milk consumption were higher during WFH period (p<0,05). The consumption of sweet beverages, tea or coffee, fast food, and alcoholic beverages was higher during WFO period (p<0,05). The subjects' physical activity level was higher during WFH period but not significantly different (p>0,05). Age, gender, and nutritional status were significantly associated with some dietary habits during WFH and WFO periods. The highest level of education was only significantly associated with particular eating habits during the WFH period (p<0,05). Gender was significantly associated with the subject's physical activity level during the WFH period (p<0,05).
Keyword: covid-19 pandemic, dietary habits, office workers, physical activity

Judul: Correlation between Nutrition Knowledge, Physical Activity, and Eating Habits among College Students during COVID-19 Pandemic
Abstrak: Kondisi pandemi Covid-19 memengaruhi kebiasaan makan dan aktivitas fisik yang dapat beresiko obesitas, sehingga diperlukan pengetahuan gizi dan gaya hidup yang sehat. Penelitian ini bertujuan menganalisis hubungan pengetahuan gizi, aktivitas fisik dan kebiasaan makan mahasiswa selama pandemi Covid-19. Desain penelitian ini adalah cross sectional melibatkan 83 mahasiswa yang berdomisili di Jabodetabek. Data pengetahuan gizi dan aktivitas fisik dikumpulkan dengan self-administered menggunakan google form, sedangkan data kebiasaan makan melalui wawancara online. Hasil penelitian menunjukkan pengetahuan gizi 83,1% subjek tergolong baik. Tingkat aktivitas fisik hampir separuh subjek (43,4%) tergolong berat dan rata-rata waktu duduk subjek 6,8 jam/hari. Kebiasaan makan mahasiswa belum sesuai anjuran pedoman gizi seimbang. Tingkat kecukupan energi dan karbohidrat subjek tergolong defisit berat, tetapi tingkat kecukupan protein dan lemak tergolong normal. Hampir 2/3 subjek memiliki tingkat kecukupan zat gizi mikro tergolong kurang. Terdapat hubungan positif (<0,05) antara pendidikan ibu dengan tingkat kecukupan lemak dan vitamin E, serta konsumsi daging sapi, kangkung, selada, mangga, dan sosis. Pendapatan orang tua berhubungan positif dengan konsumsi roti gandum, kurma, dan tahu (p<0,05). Tidak terdapat hubungan (p>0,05) antara pengetahuan gizi dengan tingkat kecukupan gizi, namun berhubungan positif dengan konsumsi ubi, buncis, salak, dan sosis (p<0,05). Tidak terdapat hubungan antara aktivitas fisik dengan kebiasaan makan (p>0,05)., The Covid-19 pandemic affects eating habits and physical activity that can risk obesity; therefore, knowledge of nutrition and a healthy lifestyle are needed. This study analyzes the correlation between nutrition knowledge, physical activity, and eating habits among college students during the Covid-19 pandemic. This study used a cross-sectional design involving 83 students in Jabodetabek. The data were collected via google form and through online interviews. The results showed 83,1% of subjects had good nutrition knowledge. The physical activity level of 43,4% of subjects was classified as high, and the average sitting time was 6,8 hours/day. Students' eating habits are not yet meet the nutrition guidelines. Energy and carbohydrate adequacy were severe deficits, but the protein and fat were normal. Almost 2/3 of the subjects had low micronutrient adequacy. There was a positive correlation (<0,05) between maternal education and fat and vitamin E adequacy and intake of several foods. Parental income was positively related to intake of frequence of some food (p<0,05). There was no correlation (p>0,05) between nutrition knowledge and nutrient adequacy, between physical activity and eating habits (p>0,05), but it was positively related to intake of several foods (p<0,05).
Keyword: College student, Covid-19 pandemic, Eating habits, Nutrition knowledge, Physical activity, Aktivitas fisik, Kebiasaan makan, Mahasiswa, Pengetahuan gizi

Judul: The Solution of Nonlinear Volterra Integral Equation using Linearization Method.
Abstrak: Many natural phenomena can be explained by mathematical models. One of those models is in the form of Volterra integral equation, which is usually nonlinear. Analitically, a nonlinear form is difficult to solve. Therefore, this research is aimed to discuss solution of Volterra integral equation using linearization method. Linearization is done to nonlinear integrand with Taylor series expansion. According to this linearization, a numerical solution of Volterra integral equation is obtained using MATLAB 7.0.1 software. Validity of this method is tested by comparing the approximate with the exact solution. The result of this research shows that the numerical solution agree with the exact solution quite well.
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