Judul: Changes in Staple Food Consumption as a Community Adaptation Process in Facing Climate Change (Case: An RT in a Traditional Village, South Cimahi Sub-district, Cimahi City
Abstrak: Sistem pangan masyarakat Indonesia tidak dapat lepas dari pengetahuan lokal dalam praktik sistem pertanian yang diadopsi oleh suku tertentu yang diterapkan secara turun-temurun antar generasi. Perubahan iklim menjadi tantangan dalam pemenuhan kebutuhan pangan yang dapat mengancam ketersediaan pangan pada komunitas adat tertentu. Penelitian ini bertujuan untuk menganalisis perubahan pangan pokok dan faktor yang menyebabkan perubahan konsumsi pangan pokok pada sebuah komunitas di Kampung Adat yang terletak di Kota Cimahi yang memiliki bentuk kearifan lokal berupa budaya mengkonsumsi pangan singkong. Metode yang digunakan dalam penelitian ini adalah metode kuantitatif yang dilengkapi data kualitatif melalui metode kuesioner dan wawancara mendalam dengan responden sebanyak 50 orang yang dipilih melalui teknik simple random sampling. Hasil penelitian menunjukkan bahwa mulainya terdapat perubahan konsumsi pangan pokok pada komunitas adat berupa mengkombinasikan antara rasi dan beras padi yang disebabkan oleh faktor adaptasi berupa ancaman ketersediaan pangan singkong. Walaupun mulai terdapat perubahan, mayoritas masyarakat masih menyukai rasi untuk dikonsumsi yang disebabkan oleh adanya nilai-nilai yang diturunkan para leluhur sehingga masyarakat memilih mempertahankan budaya mengkonsumsi rasi., The food system of the Indonesian people cannot be separated from local knowledge in agricultural system practices adopted by certain ethnic groups which are passed down from generation to generation. Climate change is a challenge in meeting food needs which can threaten food availability in certain indigenous communities. This study aims to analyze changes in staple food and the factors that cause changes in staple food consumption in the community in Traditional Village, Cimahi City which has a form of local wisdom in the form of a culture of consuming cassava food. The method used in this study is a quantitative method equipped with qualitative data through a questionnaire method and in depth interviews with 50 respondents who were selected through a simple random sampling technique. The results of the study indicated that there was a change in staple food consumption in indigenous communities in the form of a combination of rasi and rice which was caused by adaptation factors in the form of threats to cassava food availability. Even though there have been changes, the majority of people still prefer rasi to be consumed due to the values passed down from their ancestors so that the community chooses to maintain the culture of consuming rasi.
Keyword: adaptation, changes in staple food consumption, climate change

Judul: Farmer Adaptive Capacity to Climate Change in Strengthening Rice Sufficiency in Sumedang Regency, West Java Province
Abstrak: Greenhouse gas emission leads to global warming, which is fundamental to the current food security problem. An increase in global temperature of ~4°C or more above late-20th-century level, combined with increasing food demand, would pose large risks to food security globally and regionally. There are growing evidences that even at just 1°C of warming there are negative impacts for major crops like rice and corn. It is also indicated that the rate of global warming in the next decades is projected to be substantially higher than that in the last decades. Smallholder farmers, whose livelihood relies to the greatest extent on agriculture, have been reported worldwide to be one of those most affected by the adverse implication of climate change. Previous studies indicated that smallholder farmers have assumed some adaptation measures in their existing farming practices, which range from adjustment on planting calendar to investment on input and infrastructure. Their existing adaptations, however, have been reported to be inadequate and still leave substantial residual impacts untapped. The study aimed to examine existing farmer adaptive capacity to climate change and explore its future strengthening alternatives to improve the rice sufficiency at household level. Specifically, the objectives of the research were:(1) To verify the change of climatic condition in the study area and estimate its impact on rice yield under various types of existing farming practices, (2) To assess the effect of current and future climatic condition on farmers’ household rice sufficiency under the existing adaptation practices, (3) To assess farmers’ household vulnerability to the impact of current and future climatic condition on their household rice sufficiency, and (4) To identify the factors determining farmers’ existing adaptation practices. The assessment of current climate indicated an increasing trend in the annual average of minimum and maximum temperature (TMin and TMax) during 1981 – 2010, while the annual rainfall showed a decreasing trend during the same period. Furthermore, climate projection for near (2011 – 2040) and far-future (2041 – 2070) period generated by the 17 General Circulation Models (GCMs) under climate change scenario of Representative Concentration Pathways (RCP)4.5 also indicated that average annual rainfall has been projected to decrease by 6.81% and 7.34%, respectively. Meanwhile, the TMin and TMax were projected to increase by 0.65oC and 0.69oC for near-future, and then further increased by 1.23oC and 1.28oC for far-future, respectively. Similar changes in climatic condition were indicated to slightly higher extent under RCP8.5 for near- and far-future periods. The assessment of rice yield under current climate suggested that during 1990 – 2010, rice yield in the study area has been fluctuating. Furthermore, the simulated rice yield generated by CROPWAT indicated that a reduction in rice yield was projected to occur in the near- and far-future. Rice yield has been projected to decrease by 32.00% and 31.81%, in comparison to baseline, for nearfuture under RCP8.5 and RCP4.5, respectively. The reduction extended, with a slightly higher degree, to the far-future. The reduction was sensitive to variation in vii the existing farming practices. The shifting of planting time to better match rainfall pattern reduced the rice yield reduction by
Keyword: Climate change, Impact, Vulnerability, Adaptation

Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix