Christy Atika Sari

Mrs. Christy Atika Sari

Informatics Engineering, Universitas Dian Nuswantoro, Semarang, Jawa Tengah, Indonesia
orcid
Christy Atika Sari is Senior Lecture in University of Dian N...

Research Focus & Metrics

Academic Career Length

10Years (2017-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

View All Publications
1 November 2017
Verified
Conference Paper
Closed access
OIOktaviana Rena Indriani
Oktaviana Rena Indriani
EKEdi Jaya Kusuma
Edi Jaya Kusuma
CSChristy Atika Sari
Christy Atika Sari
EREko Hari Rachmawanto
Eko Hari Rachmawanto
De Rosal Ignatius Moses SetiadiDe Rosal Ignatius Moses Setiadi
De Rosal Ignatius Moses Setiadi
Tomatoes at any given time has different maturity levels, therefore it is necessary to recognize the appropriate pattern to determine the level of maturity. One of the recognition patterns of tomatoes image is to use texture and color analysis. Texture analysis can be processed using the Gray Level Co-occurrence Matrix (GLCM) method. GLCM is chosen because it has a high degree of recognition based on the value of contrast, correlation, homogeneity, and energy. Furthermore, for color analysis one of the methods that can be used is Hue, Saturation, Value (HSV). By utilizing HSV, an object with a certain color can be detected and reduce the influence of the intensity of light from outside. The results of GLCM and HSV calculations can be classified to determined the maturity level of tomatoes by using K-Nearest Neighbour (K-NN) one of basic and simple classification method which utilizes the distance (k) as a comparison of the similarity level of the image. From the research we have done, using 100 data sets, consisting of 75 training data and 25 testing data that yields the highest accuracy rate of 100% with p value on GLCM is 9 and the membership value (k) in K-NN is 3. According to the experimental results, we can conclude that our proposed method can achieve the highest accuracy.

5 March 2025 in Diagnostics
Verified
Journal Article
Open access
PDF file
Rabei Raad AliRabei Raad Ali
Rabei Raad Ali
NYNOORAYISAHBE Mohd Yaacob
NOORAYISAHBE Mohd Yaacob
MAMarwan Alqaryouti
Marwan Alqaryouti
PSProf. Alaeddin Sadeq
Prof. Alaeddin Sadeq
Mohamed DoheirMohamed Doheir
Mohamed Doheir
SYSiti Salwani Yaacob
Siti Salwani Yaacob
Background: Accurate classification of brain tumors in medical images is vital for effective diagnosis and treatment planning, which improves the patient’s survival rate. In this paper, we investigate the application of Convolutional Neural Networks (CNN) as a powerful tool for enhancing diagnostic accuracy using a Magnetic Resonance Imaging (MRI) dataset. Method: This study investigates the application of CNNs for brain tumor classification using a dataset of Magnetic Resonance Imaging (MRI) with a resolution of 200 × 200 × 1. The dataset is pre-processed and categorized into three types of tumors: Glioma, Meningioma, and Pituitary. The CNN models, including the Classic layer architecture and the ResNet50 architecture, are trained and evaluated using an 80:20 training-testing split. Results: The results reveal that both architectures accurately classify brain tumors. Classic layer architecture achieves an accuracy of 94.55%, while the ResNet50 architecture surpasses it with an accuracy of 99.88%. Compared to previous studies and 99.34%, our approach offers higher precision and reliability, demonstrating the effectiveness of ResNet50 in capturing complex features. Conclusions: The study concludes that CNNs, particularly the ResNet50 architecture, exhibit effectiveness in classifying brain tumors and hold significant potential in aiding medical professionals in accurate diagnosis and treatment planning. These advancements aim to further enhance the performance and practicality of CNN-based brain tumor classification systems, ultimately benefiting healthcare professionals and patients. For future research, exploring transfer learning techniques could be beneficial. By leveraging pre-trained models on large-scale datasets, researchers can utilize knowledge from other domains to improve brain tumor classification tasks, particularly in scenarios with limited annotated data.

28 September 2018 in Journal of ICT Research and Applications
Verified
Journal Article
Open access
PDF file
EKEdi Jaya Kusuma
Edi Jaya Kusuma
CSChristy Atika Sari
Christy Atika Sari
EREko Hari Rachmawanto
Eko Hari Rachmawanto
De Rosal Ignatius Moses SetiadiDe Rosal Ignatius Moses Setiadi
De Rosal Ignatius Moses Setiadi
A Combination of Inverted LSB, RSA, and Arnold Transformation to get Secure and Imperceptible Image Steganography

1 October 2019 in TELKOMNIKA (Telecommunication Computing Electronics and Control)
Verified
Journal Article
Open access
CSChristy Atika Sari
Christy Atika Sari
GAGiovani Ardiansyah
Giovani Ardiansyah
De Rosal Ignatius Moses SetiadiDe Rosal Ignatius Moses Setiadi
De Rosal Ignatius Moses Setiadi
EREko Hari Rachmawanto
Eko Hari Rachmawanto

1 November 2017
Verified
Conference Paper
Closed access
TST. Sutojo
T. Sutojo
PTPungky Septiana Tirajani
Pungky Septiana Tirajani
De Rosal Ignatius Moses SetiadiDe Rosal Ignatius Moses Setiadi
De Rosal Ignatius Moses Setiadi
CSChristy Atika Sari
Christy Atika Sari
EREko Hari Rachmawanto
Eko Hari Rachmawanto
Cow is one of the animals that have many benefits for humans. There are various types of cows based on benefits such as dairy cows, beef cattle, worker cattle, and others. Cattle breeding should be tailored to the needs of the public. Less knowledge about different types of cattle can reduce the benefits of farmed cattle. Content Based Image Retrieval (CBIR) can be applied to help the problem of distinguishing or knowing the type of cow. The first step of the method proposed in this research is preprocessing by changing the background color, resizing and conversion of color space. Color feature extraction calculates the average and standard deviation of the color intensity of each color component. Next extract the texture feature using Gray Level Cooccurrence Matrix (GLCM) to look for contrast, energy, correlation, homogeneity and entropy at each angle 0 ° , 45 ° , 90 ° and 135 ° with a mean of 1 averaged. Six color features and five texture features are used as attributes to perform calculations with Euclidean Distance, so it can be known the similarity between images. Cattle types used include Limousin, Simental, Brangus, Peranakan Ongole (PO), and Frisien Holstein (FH). With 100 training images and 20 test images. To measure the accuracy of the proposed CBIR is used Confusion Matrix. Based on the measurement results obtained accuracy of 95% while the precision and recall obtained 100%.

1 December 2017 in TELKOMNIKA (Telecommunication Computing Electronics and Control)
Verified
Journal Article
Open access
PDF file
WSWellia Shinta Sari
Wellia Shinta Sari
Eko Hari RachmawantoEko Hari Rachmawanto
Eko Hari Rachmawanto
De Rosal Ignatius Moses SetiadiDe Rosal Ignatius Moses Setiadi
De Rosal Ignatius Moses Setiadi
CSChristy Atika Sari
Christy Atika Sari
A Good Performance OTP Encryption Image based on DCT-DWT Steganography