Judul: Analisis proses pengambilan keputusan dan kepuasan konsumen Laundry Setrika Areng di Kota Bogor
Abstrak: Laundry Setrika Areng adalah salah satu usaha Laundry di Kota Bogor yang berdiri sejak Januari 2013. Penelitian ini bertujuan menganalisis proses pengambilan keputusan dan kepuasan konsumen Laundry Setrika Areng di Kota Bogor. Data yang digunakan berupa data primer yang diperoleh dari responden dan data sekunder dari studi literatur, dokumen perusahaan dan internet. Metode analisis menggunakan deskriptif, Importance Performance Analysis (IPA) dan Customer Satisfaction Index (CSI) dan Chi Square. Hasil Penelitian menunjukkan pengenalan kebutuhan tidak memiliki waktu mencuci sendiri. Sebagian besar responden mendapatkan informasi dari sumber pribadi. Pertimbangan terbesar menggunakan jasa laundry terletak pada kebersihan dan parfum pakaian. Hari responden ke laundry tidak menentu. Lebih dari setengah responden merasakan pelayanan laundry dalam kategori memuaskan. Berdasarkan nilai CSI tingkat kepuasan konsumen berada pada kategori “Puas”. Terdapat korelasi karakteristik responden antara usia, jenis kelamin, domisili dan status pernikahan dengan harapan konsumen.
Keyword: Costumer Satisfaction Index (CSI), Importance Performance Anaysis (IPA), satisfaction.

Judul: Pengaruh mutu pelayanan terhadap kepuasan pelanggan laundri XYZ Bogor
Abstrak: Services industry is closely related to trust, service and close relationship with customers. Laundry customers have several reasons in choosing the washing service, such as clean laundry, neat, fragrant, and employee’s awareness towards customers. Laundry service realizes that a good service is very important for competing and keeping the customers. The aims of this research is : (1) to define the customer’s assesment towards the XYZ laundry service, (2) To analyze the impact of service quality of the customers’ satisfaction towards XYZ laundry, (3) To identify factors that needed to be fixed and maintained by the XYZ laundry entrepreneur. Data on this study consists of primary data and secondary data. Primary data was collected via questionnaires given to 100 respondents which are chosen randomly. The data is analyzed by means of Descriptive Statistic Analysis, Customer Satisfaction Index (CSI), and multiple linear regression. The characteristic of the laundry XYZ’s costumers mostly dominated by costumers with age range 30-40 years old who consider quality and speed as well as practical, therefore the needs of the hospitality industry increases. Most of XYZ laundry’s costumers is dominated by men and they prefer doing other activities to doing the laundry. Besides that, men prefer to do something practical. The majority of the customer’s educational background is a degree holder or master degree holder. The higher the level of education they have, the more systematic way of thinking and the eager to get benefits for themselves. Most of the costumers are employees from companies and civil servants with an average income between Rp.2.5 million-5million per month in which customer’s choice is determined by their condition at that time. Generally, costumers make a direct communication by going to the laundry, most of them live in a rented room. Based on CSI calculation, the costumers of XYZ laundry are satisfied for the service, and from the linear regression analysis calculation it is found that service consists of tangible, reliability, responsiveness, assurance and empathy given by XYZ laundry effects the XYZ laundry customer satisfaction. As for the factors that needed to be fixed by the XYZ laundry are rearranging the position of the washed laundry, facilitate the costumers to contact the XYZ laundry officer directly or indirectly(via phone or sms) and prioritized costumers’ needs, give clearer information to costumers. Factors that need to be maintained by the XYZ laundry based on service performance given are officers’ awareness and a neat appearance of the officers.
Keyword: 

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model