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All Journal METHODIKA: Jurnal Teknik Informatika dan Sistem Informasi JOURNAL OF HUMANITIES, SOCIAL SCIENCES AND BUSINESS (JHSSB) Jurnal Pengabdian Pada Masyarakat METHABDI
Lumbanraja, Posma
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Religion Agriculture, Biological Sciences & Forestry Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Physics Public Health Social Sciences

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WATERMARKING PADA CITRA DIGITAL MENGGUNAKAN KOMBINASI PIXEL VALUE INDICATOR DAN METODE MOST SIGNIFICANT BIT Lumbanraja, Posma
METHODIKA: Jurnal Teknik Informatika dan Sistem Informasi Vol. 5 No. 1 (2019): Maret 2019
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/mtk.v5i1.416

Abstract

One way to protect the copyright and authenticity of a digital image is to affix a watermark in the form of writing or a sign on the image. If the affixed watermark is visible, then its presence can interfere with the appearance of the image and it is possible that the watermark will be cut, discarded, or cropped by parties who are not entitled to do so. In this paper, an application is designed to affix a watermark in the form of an invisible message, or an invisible watermark by using a combination of pixel value indicator and the Most Significant Bit (MSB) method on the image, so that it is not detected visually and the visual appearance of the image is not disturbed. The message is scrambled using a key, then the scrambled bits are hidden in the 5th bit MSB and the 6th bit of the green channel or blue channel, depending on the number of bits 1 owned by the red channel which serves as an indicator. The process of hiding the watermark is carried out in the middle area of ​​the image, so it is difficult to cut to remove it. Applications designed can be used to affix an invisible watermark in the form of messages that are not easily removed on digital images, so that they can protect the copyright of a digital image.
EFFECT OF BRAND TRUST AND FOOD SAFETY ON PURCHASING DECISION OF PACKAGING PRODUCTS: (Studies on Supermarket in the City of Medan) Safitri, Gadis Ayu; Lumbanraja, Posma; Marpaung, Nicholas
JOURNAL OF HUMANITIES, SOCIAL SCIENCES AND BUSINESS Vol. 2 No. 2 (2023): FEBRUARY
Publisher : Transpublika Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55047/jhssb.v2i2.574

Abstract

well as the effect of product safety on purchasing decisions, and the effect of brand trust and product safety together on purchasing decision of Le Minerale bottle product in Supermarket in the City of Medan. This research employed a quantitative technique with an associative approach. The population involved was Le Minerale consumers, namely people who had consumed Le Minerale products, both men and women. The sampling method was done by purposive sampling. The results showed that the brand trust variable partially showed F-statistic> F-table (7,789> 1,996) with sig. as big as (0,000), which means that the brand trust variable has a positive and significant effect on purchasing decisions. The product safety variable partially shows the F-statistic (4.571)> t-table (1.996) with sig. as big as (0,000), which means that the product safety variable has a positive and significant effect. Against purchasing decisions. Based on the simultaneous test (F-Test), it can be seen that the F-statistic (258,254) and F-table (3,09) with sig. (0,000), which means that the variables of brand trust and product safety together have a positive and significant effect on purchasing decisions. The analysis of determination is seen from the R Square value of 0.842, which means that the decision to purchase Le Minerale packaged products at supermarkets in Medan City can be fulfilled by brand trust and product safety by 84.2%. While the remaining 15.8% can be explained by other factors which were not examined in this study.
PENYULUHAN TEKNOLOGI INFORMASI DAN KOMUNIKASI BAGI SISWA-SISWI PADA SMA GKPI PADANG BULAN MEDAN Larosa, Fati Gratianus Nafiri; Rumapea, Humuntal; Manalu, Darwis Robinson; Maslan, Jhoni; Rumapea, Sri Agustina; Sarkis, Indra M.; Hasibuan, Doli; Rumapea, Yolanda Y. P.; Rajagukguk, Edward; Gea, Asaziduhu; Silalahi, Arina Prima; Samosir, Nettina; Aritonang, Mendarissan; Lumbanraja, Posma; Purba, Mufria J.
Jurnal Pengabdian Pada Masyarakat METHABDI Vol 3 No 1 (2023): Jurnal Pengabdian Pada Masyarakat METHABDI
Publisher : Universitas Methodist Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46880/methabdi.Vol3No1.pp66-70

Abstract

Information technology plays a very important role in the world of education, especially when blended learning is carried out, where there is a combination of face-to-face and virtual meetings. In addition, Blended Learning is a part or element of social interaction that grows and develops among students. Face-to-face meetings prioritize direct interaction both gestures or body language, voice intonation and eye gaze. There is strong information technology support that bridges interpersonal interactions, so this also influences the interactions between teachers/educators and students. Practical, eye-catching and easy to carry around, making Laptops or Smartphones a very popular Information and Communication Technology product, Blended Learning is no exception. The applications used are also very easy to install and some are even free, for example Kahoot!, Quizizz, Padlet and Canva.
Co-Authors Aritonang, Mendarissan Darwis Robinson Manalu Fati Gratianus Nafiri Larosa Gea, Asaziduhu Gultom, Muhammad Reza Firdaus Hasibuan, Doli Humuntal Rumapea Jhoni Maslan, Jhoni Marpaung, Nicholas Mufria J. Purba Rajagukguk, Edward Rumapea, Yolanda Y. P. Safitri, Gadis Ayu Samosir, Nettina Sarkis, Indra M. Silalahi, Arina Prima Sri Agustina Rumapea