Constrained Spatiotemporal Independent Component Analysis and Its Application for fMRI Data Analysis

Rasheed, Tahir,Lee, Young-Koo,Lee, Sung-Young,Kim, Tae-Seong The Korean Society of Medical and Biological Engin 2009 의공학회지 Vol.30 No.5

In general, Independent component analysis (ICA) is a statistical blind source separation technique, used either in spatial or temporal domain. The spatial or temporal ICAs are designed to extract maximally independent sources in respective domains. The underlying sources for spatiotemporal data (sequence of images) can not always be guaranteed to be independent, therefore spatial ICA extracts the maximally independent spatial sources, deteriorating the temporal sources and vice versa. For such data types, spatiotemporal ICA tries to create a balance by simultaneous optimization in both the domains. However, the spatiotemporal ICA suffers the problem of source ambiguity. Recently, constrained ICA (c-ICA) has been proposed which incorporates a priori information to extract the desired source. In this study, we have extended the c-ICA for better analysis of spatiotemporal data. The proposed algorithm, i.e., constrained spatiotemporal ICA (constrained st-ICA), tries to find the desired independent sources in spatial and temporal domains with no source ambiguity. The performance of the proposed algorithm is tested against the conventional spatial and temporal ICAs using simulated data. Furthermore, its performance for the real spatiotemporal data, functional magnetic resonance images (fMRI), is compared with the SPM (conventional fMRI data analysis tool). The functional maps obtained with the proposed algorithm reveal more activity as compared to SPM.

Identity-Exchange based Privacy Preserving Mechanism in Vehicular Networks

Rasheed Hussain(후세인 라쉬드),Heekuck Oh(오희국) 한국정보보호학회 2014 정보보호학회논문지 Vol.24 No.6

차량과 통신기술의 발전으로 임시네트워크를 이용한 지능형 교통 시스템이 실현되었다. VANET은 지능형 교통 시스템의 한 예로써, 현재 배포단계를 눈앞에 두고 있다. 하지만 지능형 교통 시스템의 많은 장점에도 불구하고, 보안과 프라이버시 문제로 아직 대다수 차량에 설치되지 못하고 있다. 사용자들은 주변 차량이나 기반시설과의 통신을 위해 자신들의 프라이버시가 노출되는 것을 원치 않기 때문이다. 따라서 지능형 교통 시스템의 대중화를 위해 프라이버시 문제는 선결되어야 한다. 일반적인 임시네트워크나 VANET과 같은 특정 상황에서 프라이버시 문제를 해결하기 위한 여러 가지 기법들이 제안되었다. 대표적으로 다중 익명성을 이용한 기법이 있지만, 이를 비콘 메시지에 적용하더라도 공격자는 사용자를 특정 지을 수 있다. 따라서 임시네트워크에서 프라이버시를 보호하기 위한 새로운 기법이 필요하다. 본 논문에서는 VANET 환경에서 프라이버시를 조건부로 보장하는 신원교환 기법을 제안한다. 사용자는 자신의 가명을 이웃과 교환하고 메시지를 보낼 땐 이웃의 가명을 이용하여 보낸다. 제안하는 기법은 분쟁이 발생하는 경우 (권한이 있는) 기관이 메시지 송신자의 익명성을 철회할 수 있게 만듦으로써 프라이버시를 조건부로 제공한다. Intelligent transportation system (ITS) is realized through a highly ephemeral network, i.e. vehicular ad hoc network (VANET) which is on its way towards the deployment stage, thanks to the advancements in the automobile and communication technologies. However, it has not been successful, at least to date, to install the technology in the mass of vehicles due to security and privacy challenges. Besides, the users of such technology do not want to put their privacy at stake as a result of communication with peer vehicles or with the infrastructure. Therefore serious privacy measures should be taken before bringing this technology to the roads. To date, privacy issues in ephemeral networks in general and in VANET in particular, have been dealt with through various approaches. So far, multiple pseudonymous approach is the most prominent approach. However, recently it has been found out that even multiple pseudonyms cannot protect the privacy of the user and profilation is still possible even if different pseudonym is used with every message. Therefore, another privacy-aware mechanism is essential in vehicular networks. In this paper, we propose a novel identity exchange mechanism to preserve conditional privacy of the users in VANET. Users exchange their pseudonyms with neighbors and then use neighbors’ pseudonyms in their own messages. To this end, our proposed scheme conditionally preserves the privacy where the senders of the message can be revoked by the authorities in case of any dispute.

Poster Session : PS 0131 ; Neurology : Age, Sex and Stroke Type Differences in Stroke Patients at Mukalla, Hadhramout: Analysis of 1072 Cases

( Rasheed Mohammed Bamekhlah ),( Nabeel Musian ),( Hussain Alghazali ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: Stroke is the third leading cause of death, and a cause of long-term disability among survivors. Our aim was to identify age, sex and stroke type differences in stroke patients. Methods: A cross-sectional study of stroke patients admitted at Ibnseena Hospital, Hadhramout, Yemen in (2009- 2011). Results: stroke cases were 1072 (66.1±14.6) years; ischemic 78.5% and hemorrhagic 21.5%. Males 56.5% and females 43.5%. Patients >60 years 72%, in middle-aged 25.5%, while young <40 years 2.5%. Hypertension in 63.7% and 53.2% of middle- aged & elderly, and in 29.6% of young. Diabetes in 36.3% and 39.5% of middle- aged and old, while in 7.4% of young. Elderly had =2 risk factors (89.9%), 68.9% of middle-aged and 55.6% of the young. Ischemic type increased with age, while hemorrhagic was more in young. Coma was more in the young (29.6%), than in middle- aged (18.3%) and old (19.6%). Nonsignifi cant difference in hypertension, diabetes, previous attack and family history between males & females, Smoking had signifi cant difference between males & females, 94.2% of males had =2 risk factors and females (70%). Ischemic type in 76.2% of males and 81.3% of females while the hemorrhagic in 32.8% and 18.7%. Hypertension in hemorrhagic was signifi cantly higher (81.4%) than in ischemic (48.2%), nonsignifi cant difference between diabetes in ischemic and hemorrhagic. Previous attack was signifi cantly higher in hemorrhagic than ischemic. Sudden onset was signifi cantly higher in hemorrhagic (98.7%) than ischemic (83.2%), coma was higher in hemorrhagic (38.1%) than in ischemic (14.4%) Conclusions: Stroke increased with age. Ischemic type was more in old and hemorrhagic in young patients. Males were more affected. No sex differences with risk factors. Hemorrhagic stroke was more related to hypertension, previous attacks, sudden onset and coma.

Formulation, characterization and in vitro evaluation of herbal sunscreen lotion

Rasheed, Arun,Shama, S. Neelufar,Mohanalakshmi, S.,Ravichandran, V. 경희한의학연구센터 2012 Oriental Pharmacy and Experimental Medicine Vol.12 No.4

Natural substances extracted from plants have recently been considered as potential sunscreen resources owing to high ultraviolet ray absorption and antioxidant activity. The decrease in the intensity of UV radiation reaching the skin through sunscreens may reduce the risk of sun-induced skin cancer. The present study attempts to develop sunscreen lotions, possessing broad spectrum of anti-UV radiation effectiveness with reduced concentration of chemical UV filters, from the extracts of bioactive products such as Curcuma longa L. (Zingiberaceae), Aloe vera (Liliaceae) and Alpinia galanga Willd. The effectiveness of the product was evaluated using Sun Protection Factor (SPF). Curcumin was selected as potential bioactive agents due to their phytochemical compositions possessing considerable content of polyphenolic compounds and Alpinia galanga is used as key ingredient in various commercial sunscreen lotions as it has skin protectant action against UV rays and boosts the activity of conventional sunscreens. The sunscreen lotions were prepared using three different compositions F1, F2 and F3 and evaluated for their stability, safety and SPF. Results showed that the sunscreen lotions were non-mutagenic, non-irritant, stable and possess SPF for normal skin. The efficacy when tested with a standard was observed to be same as that of a marketed sunscreen with SPF 55 and SPF 20. From the present study, formulation F2 having curcumin extract was proved to be stable and effective with high SPF compared to F1 and F3.

Reconstruction algorithm for archaeological fragments using slope features

Rasheed, Nada A.,Nordin, Md Jan Electronics and Telecommunications Research Instit 2020 ETRI Journal Vol.42 No.3

The reconstruction of archaeological fragments in 3D geometry is an important problem in pattern recognition and computer vision. Therefore, we implement an algorithm with the help of a 3D model to perform reconstruction from the real datasets using the slope features. This approach avoids the problem of gaps created through the loss of parts of the artifacts. Therefore, the aim of this study is to assemble the object without previous knowledge about the form of the original object. We utilize the edges of the fragments as an important feature in reconstructing the objects and apply multiple procedures to extract the 3D edge points. In order to assign the positions of the unknown parts that are supposed to match, the contour must be divided into four parts. Furthermore, to classify the fragments under reconstruction, we apply a backpropagation neural network. We test the algorithm on several models of ceramic fragments. It achieves highly accurate results in reconstructing the objects into their original forms, in spite of absent pieces.

Slide Session : OS-END-17 ; Endocrinology : Metabolic Syndrome Among Diabetic and Hypertensive Patients in Hadhramout

( Rasheed Mohammed Bamekhlah ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: The metabolic syndrome (MetS) is a cluster of cardiovascular risk factors: diabetes, hyperlipidemia and high blood pressure. People with MetS are twice as likely to die from and three times as likely to have a heart attack or stroke compared with people without. Our objective was to observe the frequency of MetS in patients with type 2 diabetes mellitus (DM) and with hypertension. Methods: A cross-sectional study conducted at lbnseena Hospital, Mukalla, Hadhramout, Republic of Yemen from 04/2012 to 02/2013. Two hundreds of type 2 DM and 200 hypertensive cases were included; MetS was estimated according to International Diabetes Federation (IDF) criteria. Results: diabetic patients, 92 were males and 108 females, hypertensive patients 109 were males and 91 females. In diabetics, 130 (65%) had MetS (58.2±10.4years), 57 were males and 73 females. In hypertensive cases, 109 (54.5%) had MetS (57.9±9.2 years), 56 were males and 57 females. Waist circumference was 98.7±6.7 cm in diabetics and 98.7±6.7 cm in hypertensive. In MetS Triglycerides was 152±13.4mg/ dl in diabetics and 154±13.2mg/dl in hypertensive and both were significantly higher in MetS patients. Serum HDL-C was significantly lower in MetS cases, 40.3±8.5mg/ dl in diabetics and 40.9±8.4mg/dl in hypertensive. Increased waist circumference was present in all MetS cases, hypertension in 81.5% in diabetics and DM in 92.7% of hypertensive. Low HDL-C in 62.3% of diabetics and 66.1% of hypertensive, high triglycerides in 57.7% of diabetics and 54.1% of hypertensive. 24.6% of diabetics and 11% of hypertensive were having three criteria, 48.5% of diabetics and 58.7 of hypertensive with four, and 26.9% of diabetics and 30.3% of hypertensive with all criteria.. Conclusions: Metabolic syndrome is common among type 2 diabetic and hypertensive patients in our province; Hadhramout. Most patients were having more than three IDF criteria.

The Exchange-Correlation Field Effect over the Magnetoacoustic-Gravitational Instability in Plasmas

Rasheed, A.,Jamil, M.,Jung, Young-Dae,Sahar, A.,Asif, M. De Gruyter 2017 Zeitschrift für Naturforschung. A, A journal Vol.72 No.10

<P>Jeans instability with magnetosonic perturbations is discussed in quantum dusty magnetoplasmas. The quantum and smaller thermal effects are associated only with electrons. The quantum characteristics include exchange-correlation potential, recoil effect, and Fermi degenerate pressure. The multifluid model of plasmas is used for the analytical study of this problem. The significant contribution of electron exchange is noticed on the threshold value of wave vector and Jeans instability. The presence of electron exchange and correlation effects reduce the time to stabilise the phenomenon of self-gravitational collapse of massive species. The results of Jeans instability by magnetosonic perturbations at quantum scale help to disclose the details of the self-gravitating dusty magnetoplasma systems.</P>

A New Approach Towards Aggregation in VANET

( Rasheed Hussain ),( Fizza Abbas ),( Junggab Son ),( Sangjin Kim ),( Heekuck Oh ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2

Advancements in automobile industries and the communication technologies caused VANET (Vehicular Ad Hoc NETwork) to evolve to VANET-based clouds before its deployment. It is more likely that VANET clouds will replace the traditional VANET in the deployment phase. It is to be noted that an abrupt deployment is out of question because it would require mass of resources and money to do so; instead incremental deployment is more ideal. In this paper, we aim at the incremental deployment phase of VANET clouds and focus on the well-established public transport networks. Data aggregation is one of the essential aspects in traditional VANET and has been researched for quite long time. However the previously proposed schemes are still controversial. Keeping in mind the time and space prediction of public buses, we leverage these buses as potential aggregators and MG (Mobile Gateways) in VANET clouds. Buses gather cooperative whereabouts information from neighbors, aggregate that information, disseminate it to the neighbor MGs and also send it to the cloud for storage and for services exchange. In our proposed scheme, we believe that the dissemination will be effective and cover most of the urban area since at any instant of time; buses cover most part of the urban areas. Besides, the effective transmission range is higher due to tall buses

A Secure and Privacy-Aware Route Tracing and Revocation Mechanism in VANET-based Clouds

Rasheed Hussain(후세인 라쉬드),Heekuck Oh(오희국) 한국정보보호학회 2014 정보보호학회논문지 Vol.24 No.5

많은 연구 끝에 VANET의 상용화를 눈앞에 두고 있다. VANET은 차량용 애드혹 네트워크의 약자로서, Cloud와 융합하는 방향으로 연구가 진행되고 있다. 하지만 놀랍게도 VANET 기반 클라우드로 진화한데 가장 큰 역할을 한 것은 차량과 통신기술의 발달이다. 이러한 기술이 확산되는 단계에서 연구자들은 항상 보안과 프라이버시에 대해 고민해 왔다. 게다가 VANET처럼 프라이버시, 익명철회, 경로추적 등 상반된 보안 이슈들이 서로 얽힌 상황은 연구자들을 더욱 고민에 빠지게 했다. 최근 Hussain 등은 VANET 기반 클라우드 프레임워크인 VuC (VANET using Clouds)를 제안하였다. VuC는 VANET과 클라우드가 VANET 사용자(서비스 가입자)에게 서비스를 제공하기 위해 협력하는 환경을 말한다. 본 논문은 Hussain 등이 제안한 VANET 기반 클라우드 프레임워크인 VuC에 초점을 두고 있으며, 특히 앞서 말한 프라이버시, 익명철회, 경로추적에 대한 문제를 다루고 있다. 제안하는 기법은 다중 익명화를 통해 프라이버시를 보호한다. 또한 비컨(Beacon)메시지를 클라우드에 저장하여 경로추적과 익명 철회에 활용한다. 익명철회 권한을 가진 기관들은 연합하여 사용자 노드가 선택한 경로를 특정 시간 동안 추적할 수 있으며, 필요한 경우 신원을 확인할 수 있다. 제안된 기법은 안전하고 조건부 익명성을 보장하며 기존의 기법에 비해 연산량이 적다 Vehicular Ad hoc Network (VANET) has gone through a rich amount of research and currently is making its way towards the deployment. However, surprisingly it evolved to rather more applications and services-rich breed referred to as VANET-based clouds due to the advancements in the automobile and communication technologies. Security and privacy have always been the challenges for the think tanks to deploy this technology on mass scale. It is even worse that some security issues are orthogonally related to each other such as privacy, revocation and route tracing. In this paper, we aim at a specific VANET-based clouds framework proposed by Hussain et al. namely VANET using Clouds (VuC) where VANET and cloud infrastructure cooperate with each other in order to provide VANET users (more precisely subscribers) with services. We specifically target the aforementioned conflicted privacy, route tracing, and revocation problem in VANET-based clouds environment. We propose a multiple pseudonymous approach for privacy reasons and leverage the beacons stored in the cloud infrastructure for both route tracing and revocation. In the proposed scheme, revocation authorities after colluding, can trace the path taken by the target node for a specified timespan and can also revoke the identity if needed. Our proposed scheme is secure, conditional privacy preserved, and is computationally less expensive than the previously proposed schemes.

Formulation, standardization and pharmacological evaluation of a poly herbal traditional remedy -Ashwagandharishtam

Rasheed, Arun,Roja, C.,Reddy, G. Avinash Kumar,Reddy, B. Sravya 경희한의학연구센터 2012 Oriental Pharmacy and Experimental Medicine Vol.12 No.1

Ayurvedic formulations were considered the best and safer alternatives for synthetic drugs. But the demand to such products is diminishing due to lack of standardization. Ashwagandharishtam, a fermented kind of ayurvedic formulation, is used to treat epilepsy, nervous disorders, skin diseases, immune disorders and rheumatism. In the present study, the standardization of Ashwagandharishtam using sophisticated techniques were attempted for assessing the quality and safety of herbal products involved in it. It was formulated according to a working formula and its physicochemical, pharmacological and biological parameters were determined. The results of physicochemical studies showed that the values were under acceptable limits as per the Ayurvedic Pharmacopoeial specifications. FTIR studies of formulation revealed the presence of functional groups similar to Ashwagandha powder. The heavy metal content in the formulation is determined using Atomic Absorption Spectroscopy. HPTLC reports proved the presence of biomarker, withanolide-A in ashwagandharishtam which helped in its chemical standardization. The anti-epileptic activity of ashwagandharishtamwas evaluated by Maximal electro shock (MES) method in rats. It exhibited a dose dependent significant (P<0.001) reduction in various phases of epileptic seizures when compared with that of standard phenytoin. It was also assessed for its anti inflammatory activity in carrageen induced paw edema method which showed a good activity comparable to standard thus making it biologically standardized.