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    Decrypting the Transposition Cipher Using a New Move Operator on Particle Swarm Optimization
    (Ieee, 2018) Demirci, Hüseyin; Yurtay, Nilüfer; Yıldız, Tuba Karagül
    Transposition cipher encryption is a historical encryption method which is based on swapping letter of columns on base text according to a secret key. In this paper, we present a new swap based move operator for the particle swarm optimization algorithm. We have tested the operator on transposition cipher encryption with a text size of 125, 250, 500 and 750 letter and 5, 10, 15 key lengths. The algorithm we developed has recovered the exact original key in some tests. In most cases, particularly, the algorithm have recovered 70% of the keys and in the worst case the algorithm have recovered only sequences of the original key which can make the encrypted text barely readable for the human eye and most of the words are decrypted.
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    Malignancy and Complication Rate in Reoperation of Recurrent Goiter
    (Gazi Univ, Fac Med, 2016) Yavuz, Halise Çınar; Mete, Türkan; Irak, Leyla; Aydın, Yusuf; Demirci, Hüseyin; Güler, Serdar
    Objective: The aim of this study was to evaluate the fine needle aspiration biopsy findings of recurrent goiter patients who were operated subtotally or lobectomised for benign causes, and to determine the malignancy and complication rates for those who were reoperated. Methods: Between 2008 and 2009, 114 patients diagnosed with recurrent goiter were involved in this study. The cytological findings of 158 nodules and histological findings of 18 patients with reoperation were examined. The complications of primary surgery and reoperation of recurrent goiter were determined. Results: The operation indications were euthyroid multinodular goiter in 106 of the patients and toxic multinodular goiter in 8 of them. The average time elapsed from the time of the first operation was 16.5 +/- 7.5 years. The patients with a fine needle aspiration biopsy resulted in 6 with suspicion of malignancy, 3 with malignancy, 5 with hurtle cell cytology, 7 with cellular microfollicular lesion, 1 patient with toxic multinodular goiter and 2 with inadequate cellular cytology; a total of 24 patients (21%) were asked for reoperation. Among the 18 patients who accepted reoperation, pathology results discovered 2 papillary microcarcinomas and 2 papillary thyroid carcinomas. A total of 7 of the 18 patients with reoperation had surgical complications: 3 had vocal cord paralysis and 4 had hypoparathyroidism. Conclusion: In our study, we found that a high rate of recurrent goiter patients required reoperation and there was a considerable amount of complication rate of reoperative thyroid surgery. To eliminate the potential risk of reoperation, we recommend a total thyroidectomy instead of subtotal thyroidectomy or lobectomy as the surgery of choice for the primary surgery with benign indications.