Performance Comparison of Autoencoder based OFDM Communication System with Wi-Fi

Shiho Oshiro,Takao Toma,Tomohisa Wada International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.5

In this paper, performance of autoencoder based OFDM communication systems is compared with IEEE 802.11a Wireless Lan System (Wi-Fi). The proposed autoencoder based OFDM system is composed of the following steps. First, one sub-carrier's transmitter - channel - receiver system is created by autoencoder. Then learning process of the one sub-carrier autoencoder generates constellation map. Secondly, using the plural sub-carrier autoencoder systems, parallel bundle is configured with inserting IFFT and FFT before and after the channel to configure OFDM system. Finally, the receiver part of the OFDM communication system was updated by re-learning process for adapting channel condition such as multipath channel. For performance comparison, IEEE802.11a and the proposed autoencoder based OFDM system are compared. For channel estimation, Wi-Fi uses initial long preamble to measure channel condition. but Autoencoder needs re-learning process to create an equalizer which compensate a distortion caused by the transmission channel. Therefore, this autoencoder based system has basic advantage to the Wi-Fi system. For the comparison of the system, additive random noise and 2-wave and 4-wave multipaths are assumed in the transmission path with no inter-symbol interference. A simulation was performed to compare the conventional type and the autoencoder. As a result of the simulation, the autoencoder properly generated automatic constellations with QPSK, 16QAM, and 64QAM. In the previous simulation, the received data was relearned, thus the performance was poor, but the performance improved by making the initial value of reception a random number. A function equivalent to an equalizer for multipath channels has been realized in OFDM systems. As a future task, there is not include error correction at this time, we plan to make further improvements by incorporating error correction in the future.

Channel Transfer Function Estimation based on Delay and Doppler Profile for Underwater Acoustic OFDM Communication System

Shiho, Oshiro,Tomohisa, Wada International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.1

In this paper, we proposed Channel Transfer Function estimation based on Delay and Doppler Profile for underwater acoustic OFDM communication system. It improved the estimation accuracy of the channel transfer function by linear time interpolation the change of Scattered Pilot (SP) insertion frequency in the time direction and the time by Delay and Doppler profile that analyzes the multipath situation of the channel investigated the performance of interpolation by simulation and report it. Previous works is inserted SP every 4 OFDM. It was effective under the environment without multipath, but it has observed that the effect of CTF compensation has been lowered in multipath channel condition. In addition to be better when inserted SP every 2 OFDM. But the amount of sending data will be decrease. Therefore, we conducted research to improve 4 OFDM with new interpolator. A computer simulation was performed as a comparison of SP inserted every 4 OFDM, SP inserted every 2 OFDM, and 4 OFDM with new interpolator. the performance of the proposed system is overwhelmingly improved, and the performance is slightly improved even 64 QAM.

The relationship between positive peritoneal cytology and the prognosis of patients with FIGO stage I/II uterine cervical cancer

Shiho Kuji,Yasuyuki Hirashima,Satomi Komeda,Aki Tanaka,Masakazu Abe,Nobutaka Takahashi,Munetaka Takekuma 대한부인종양학회 2014 Journal of Gynecologic Oncology Vol.25 No.2

Objective: The purpose of this study was to assess whether peritoneal cytology has prognostic significance in uterine cervical cancer. Methods: Peritoneal cytology was obtained in 228 patients with carcinoma of the uterine cervix (International Federation of Gynecology and Obstetrics [FIGO] stages IB1-IIB) between October 2002 and August 2010. All patients were negative for intraperitoneal disease at the time of their radical hysterectomy. The pathological features and clinical prognosis of cases of positive peritoneal cytology were examined retrospectively. Results: Peritoneal cytology was positive in 9 patients (3.9%). Of these patients, 3/139 (2.2%) had squamous cell carcinoma and 6/89 (6.7%) had adenocarcinoma or adenosquamous carcinoma. One of the 3 patients with squamous cell carcinoma who had positive cytology had a recurrence at the vaginal stump 21 months after radical hysterectomy. All of the 6 patients with adenocarcinoma or adenosquamous carcinoma had disease recurrence during the follow-up period: 3 with peritoneal dissemination and 2 with lymph node metastases. There were significant differences in recurrence-free survival and overall survival between the peritoneal cytology-negative and cytology-positive groups (log-rank p<0.001). Multivariate analysis of prognosis in cervical cancer revealed that peritoneal cytology (p=0.029) and histological type (p=0.004) were independent prognostic factors. Conclusion: Positive peritoneal cytology may be associated with a poor prognosis in adenocarcinoma or adenosquamous carcinoma of the uterine cervix. Therefore, the results of peritoneal cytology must be considered in postoperative treatment planning.

Immunosensitivity and specificity of insulinoma-associated protein 1 (INSM1) for neuroendocrine neoplasms of the uterine cervix

Shiho Kuji,Akira Endo,Manabu Kubota,Atsushi Uekawa,Fumi Kawakami,Yoshiki Mikami,Junki Koike,Nao Suzuki 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.1

Objective: Previously, we reported that insulinoma-associated protein 1 (INSM1) immunohistochemistry (IHC) showed high sensitivity for neuroendocrine carcinoma of the uterine cervix and was an effective method for histopathological diagnosis, but that its specificity remained to be verified. Therefore, the aim was to verify the specificity of INSM1 IHC for a large number of non-neuroendocrine neoplasia (NEN) of the cervix. Methods: RNA sequences were performed for cell lines of small cell carcinoma (TCYIK), squamous cell carcinoma (SiHa), and adenocarcinoma (HeLa). A total of 104 cases of formalin-fixed and paraffin-embedded specimens, 16 cases of cervical NEN and 88 cases of cervical non-NEN, were evaluated immunohistochemically for conventional neuroendocrine markers and INSM1. All processes without antigen retrieval were performed by an automated IHC system. Results: The transcripts per million levels of INSM1 in RNA sequences were 1505 in TCYIK, 0 in SiHa, and HeLa. INSM1 immunoreactivity was shown only in the TCYIK. Immunohistochemical results showed that 15 cases of cervical NEN showed positive for INSM1; the positivity score of the tumor cell population and the stain strength for INSM1 were high. Two of the 88 cases of cervical non-NENs were positive for INSM1 in one case each of typical adenocarcinoma and squamous cell carcinoma. The sensitivity of INSM1 for cervical NEN was 94%; specificity, 98%; the positive predictive value, 88%; and the negative predictive value, 99%. Conclusion: INSM1 is an adjunctive diagnostic method with excellent specificity and sensitivity for diagnosing cervical NEN. Higher specificity can be obtained if morphological evaluation is also performed.

The Hardware CPG Model for Humanoid Robot HOAP2

Shiho Akazawa,Yoshifumi Sekine 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

In recent years, the development of humanoid robots is advancing rapidly. Development of robots, which are learning, is being widely improved, for example robots, which can work in harmony with humans. However, for the humanoid robot’s information processing system to simulate a human being’s brain function, research in neural networking must be greatly advanced. We are researching to control robots using pulse-type hardware neuron model modeling the pulse form of an actual human brain. In this paper, we propose the hardware CPG (Central Pattern Generator) model using software for humanoid robot HOAP2. We clarify the stability in the step movement by using the hardware CPG model.

Optimal positive lymph node ratio showing the benefit of postoperative radiotherapy in pathologic N2 non-small cell lung cancer: an exploratory study using the Surveillance, Epidemiology, and End Results data

Shiho Lee,O Kyu Noh 대한방사선종양학회 2022 Radiation Oncology Journal Vol.40 No.1

Purpose: This study aimed to identify the clinical parameters having the beneficial effect of postoperative radiotherapy (PORT) in pathologic N2 (pN2) non-small cell lung cancer (NSCLC) using the Surveillance, Epidemiology, and End Results (SEER) data. Materials and Methods: Among non-metastatic NSCLC patients in the SEER data, we included patients who diagnosed after 2002, who confirmed as pN2 after lobectomy or pneumonectomy, and who coded as underwent PORT or observation. Patients who survived less than 4 months of diagnosis were excluded in consideration of the perioperative mortality. After performing propensity score matching (PSM) on the selected patients, we compared PORT group with surgery alone group. We also performed exploratory subgroup analysis to find patients who could benefit from PORT. Results: Among the selected 4,456 patients, 1,729 patients received PORT, and 2,727 patients did not. There was no survival benefit of PORT in all patients with pN2 disease (hazard ratio [HR] = 1.03, p = 0.5). In subgroup analyses, the patients with a positive lymph node (LN) ratio of 60%-80% showed the significant benefit of PORT (HR = 0.71, p = 0.002). Conclusion: PORT did not show the significant survival benefit in patients with pN2 disease after correcting the confoundedness in the SEER data. However, a specific range of LN ratios can be a potential indicator maximizing the survival benefit of PORT.

Heat coma temperature, relative contents of saturated/unsaturated fatty acids and reproductive maturation in the oceanic sea skaters Halobates micans

Shiho Takenaka,Chihiro Katagiri,Vladimír Koštál,Tetsuo Harada 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3

This study was performed to clarify how the relative volume of saturated/unsaturated lipid and reproductivematuration relate to resistance to high temperature in the oceanic sea skaters, Halobates micans. Heat comatemperature (HCT) was measured in H. micans adults collected from a fixed sampling location (12°00′N,135°00′E) in the western tropical Pacific Ocean. After measuring HCT, the specimen were dissected to measurethe testes size and to determine the presence and number of oocytes in females. Bodies of the specimen wereassessed by lipid analysis to evaluate saturated and unsaturated lipid content. A negative trendwas seen betweenheat coma temperature and percentage of a saturated fatty acid, myristic acid (ratio of carbon number to numberof double bonds = 14:0) (Pearson's correlation test: r = −0.520, p = 0.101). In contrast, a positive trend wasdetected between heat coma temperature and percentage of an unsaturated fatty acid, palmitoleic acid (16:1)(r = 478, p = 0.137). Young males with small testes showed lower heat coma temperatures, whereas femalesthat showed relatively high heat coma temperatures of 36–40 °C tended to have fewer mature oocytes in theirovaries than those that showed low heat coma temperatures of 30–34 °C. As Halobates appears to exhibitembryonic diapause rather than adult diapause, males of H. micans may develop both testes and resistance tohigh temperature in the parallel as they grow. In females, a trade-off may occur between heat tolerance functionand oogenesis in the oceanic sea skaters.

Fundamental Study of the Number of Discrete Measurement Points on the Sound Power Level Using Sound Intensity Method

Shiho Nagata,Kenji Furihata,Takesaburo Yanagisawa 한국소음진동공학회 2003 한국소음진동공학회 국제학술대회논문집 Vol.2003 No.8

A Study on Stability Robustness of Dynamic Controller Design

Ryu, Shiho,Oh, Yonghun,Jeong, Sanghwa CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.1

In industrial production-distribution systems, production and purchasing rates, associated inventories, and sales are very critical in contributing to the profits of each component. The objective of this study is to investigate an effective information control for a production-distribution system by automatic feedback control techniques. In this work, a dynamic control scheme is developed which is an Integrated-Error with State-Feedback and filtering(ISFF) as a new algorithm for a dynamic controller. Generalized formulations of the dynamic control are proposed in the continuous-time and discrete-time cases. A methodology for an evaluation of ISFF controller gains using the eigen-structure property is presented. When the upper-limit is imposed on the productive capability by available factory space and capital equipment, supervisory control is provided to avoid a integrator-windup and deterioration of system performance.

자동차 산업에 다가오는 디지털 트랜스포메이션과 밀레니얼 세대

김시호(Shiho Kim) 한국자동차공학회 2019 오토저널 Vol.41 No.8