Judul: Efektivitas Promosi Melalui Twitter pada Perusahaan Pariwisata Bahari “Ibu Penyu”
Abstrak: Promotion via twitter performed by Travel Agents "Ibu Penyu" to marketing their service. In addition, the promotion was also made to introduce marine tourism in Indonesia. Twitter presence is considered as one of the media for nautical tourism company in expanding economic activity. The purpose of this research are to analyze the characteristics of respondents and promotional activities, analyze the effectiveness of the promotion via twitter and analyze the correlation between the characteristics of the respondents and the effectiveness of promotional activities through the promotion of marine tourism company twitter "Ibu Penyu". The method used in data collection is via an online questionnaire that was distributed to the followers @ibupenyu. Data were analyzed using Spearman-rank correlation test and chi-square difference test. The results in this study are twitter effective of the promotion. Factors related to the effectiveness of the promotion is age, education level, income level, the frequency of feedback messages, rate the attractiveness of the message, and clarity in the delivery of information.
Keyword: Bogor Agricultural University, effectiveness, promotion, nautical

Judul: The Effectiveness of Social Media @Kebunraya_Id as Ecotourism Marketing Communication Media Bogor Botanical Garden
Abstrak: Seiring berkembangnya teknologi dan internet di Indonesia memunculkan media-media baru dalam media promosi salah satunya adalah media sosial. Media promosi digunakan pada berbagai bidang usaha salah satunya pada bidang pariwisata khususnya ekowisata yang merupakan wisata alam berbasis pendidikan dan berkelanjutan, sehingga diperlukannya media promosi yang efektif. Tujuan dari penelitian ini adalah untuk menganalisis efektivitas media sosial @kebunraya_id sebagai media komunikasi pemasaran ekowisata di Kebun Raya Bogor. Metode yang digunakan adalah analisis data primer dan sekunder dengan pendekatan kuantitatif yang didukung oleh data kualitatif. Teknik pengambilan sampel yang digunakan adalah teknik accidental sampling dengan jumlah responden sebanyak 50 orang yang merupakan pengunjung Kebun Raya Bogor. Hasil penelitian menunjukan media sosial @kebunraya_id tergolong cukup efektif sebagai media komunikasi pemasaran dengan rataan skor yang cukup tinggi yaitu 2,97 dalam skala 1-4. Faktor-faktor yang berhubungan dengan efektivitas media sosial @kebunraya_id, yaitu karakteristik media sosial berhubungan nyata dengan action dan share, serta keterdedahan media sosial yang berhubungan nyata dengan attention, interest, search, dan share., Along with the development of technology and the internet in Indonesia, new media have emerged in promotional media, one of which is social media. Promotional media is used in various business fields, one of which is in the field of tourism, especially ecotourism which is an education-based and sustainable nature tourism, so that effective promotional media is needed. The purpose of this study was to analyze the effectiveness of social media @kebunraya_id as an ecotourism marketing communication media at the Bogor Botanical Garden. The method used is primary and secondary data analysis with a quantitative approach supported by qualitative data. The sampling technique used is accidental sampling technique with a total of 50 respondents who are visitors to the Bogor Botanical Garden. The results showed that social media @kebunraya_id is quite effective as a marketing communication medium with a fairly high average score of 2.97 on a scale of 1-4. Factors related to the effectiveness of social media @kebunraya_id, namely social media characteristics are significantly related to action and share, as well as social media discoverability which is significantly related to attention, interest, search, and share.
Keyword: ecoturism, marketing communication, social media effectiveness

Judul: Mathematical model of Hematopoietic Stem Cell in Chronic Myelogenous Leukemia with and without Therapy
Abstrak: Leukemia or blood cancer is a diverse group of neoplastic disease, characterized by the multiplication of abnormal leukocytes or malignant transformation of blood-forming cells in bone marrow and lymphoid tissues. One of the most common types of leukemia is Chronic Myelogenous Leukemia (CML), which is usually diagnosed by the presence of certain chromosomal abnormalities, the so-called Philadelphia chromosome (Ph). One of the treatments of CML is Granulocyte Colony-Stimulating Factor (G-CSF). In this paper, we discuss two Hematopoietic Stem Cell (HSC) models, i.e. HSC without treatment and HSC with G-CSF treatment. The model of HSC without treatment included three equations representing the dynamics of HSC, leukocyte and platelet. Whereas, the model of HSC with G-CSF treatment includes the previous three equations and adds two more equations representing G-CSF injection and G-CSF circulation. The stability behavior of the system approaching the equilibrium points in the simulation study is carried out using Mathematica 7.0. The simulation results show that the G-CSF treatment can successfully decrease the number of HSC, which means reducing the CML.
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