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Introduction:The segmentation method has a number of approaches, one of which is clustering. The clustering method is widely used for segmenting retinal blood vessels, especially the k-mean algorithm and fuzzy c-means (FCM). Unfortunately, so far there have been no studies comparing the two methods for blood vessel segmentation. Many studies do not explain the reason for choosing the method. Aim: This study aims to analyze the performance of the algorithms of k-means and FCM for retinal blood vessel segmentation. Methods: This research method is divided into three stages, namely preprocessing, segmentation, and performance analysis. Preprocessing uses the green channel method, Contrast-limited adaptive histogram equalization (CLAHE) and median filter. Segmentation is divided into three processes, namely clustering, thresholding and determining the region of interest (ROI). In the thresholding process, the determination of the threshold value uses two methods, namely the mean and the median. The third stage performs performance analysis using the performance parameters of the area under the curve (AUC) and statistical tests. Results: The statistical test results comparing FCM with k-means based on AUC values resulted in p-values <0.05 with a confidence level of 95%. Conclusion: Retinal vascular segmentation with the FCM method is significantly better than k-means.

Acupressure, Back Pain, Pregnancy. Acupressure is effective to relieve back pain in Meridian point. Acupressure technique is done to help pregnant women in relieving complaints in pregnancy such as nausea and vomiting. In labour process, this technique can be an induction of labor, and can reduce anxiety. The purpose is to know the influence of acupressure technique to relieve back pain for pregnant women in Puskesmas Jogonalan I area of Klaten. Research is pre experimental design with one group pretest posttest approach. The population is all pregnant women in Puskesmas Jogonalan I area of Klaten. The population target is all third trimester of pregnant women in Puskesmas Jogonalan I area of Klaten. Technique sampling is purposive sampling with 30 peopole, ang using t-test data analysis. The characteristics of respondents showed that most of them are 20-35 years old, their gestational age are 31-37 weeks, their occupation are housewives, and most of them have 2-3 children. Degree of back pain in pregnant women before acupressure as many as 21 people (70%) are in severe pain. Degree of back pain in pregnant women after given acupressure as many as 24 people (80%) are in mild pain. There is influence of acupressure technique to relieve back pain for pregnant women in Puskesmas Jogonalan I area of Klaten (t = 9,893; p=0,001<0,05).

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