SoMeT - A Formal Verification Approach of Conversations in Composite Web Services Using NuSMV

Web service composition is currently a very focused-on topic of research, with many studies being proposed by academic and industrial research groups. This paper discusses the design and verification of behavior of composite Web services. We model composite Web services based on two behaviors, namely control and operational. These behaviors communicate through conversation messages. We use state charts to model composite Web services and verify the synchronization of the conversations among them using symbolic model checking with NuSMV

A formal verification approach of conversations in composite web services using NuSMV

Web service composition is currently a very focused-on topic of research, with many studies being proposed by academic and industrial research groups. This paper discusses the design and verification of behavior of composite Web services. We model composite Web services based on two behaviors, namely control and operational. These behaviors communicate through conversation messages. We use state charts to model composite Web services and verify the synchronization of the conversations among them using symbolic model checking with NuSMV. © 2009 IOS Press. All rights reserved

Symbolic model checking composite Web services using operational and control behaviors

This paper addresses the issue of verifying if composite Web services design meets some desirable properties in terms of deadlock freedom, safety (something bad never happens), and reachability (something good will eventually happen). Composite Web services are modeled based on a separation of concerns between business and control aspects of Web services. This separation is achieved through the design of an operational behavior, which defines the composition functioning according to the Web services\u27 business logic, and a control behavior, which identifies the valid sequences of actions that the operational behavior should follow. These two behaviors are formally defined using automata-based techniques. The proposed approach is model checking-based where the operational behavior is the model to be checked against properties defined in the control behavior. The paper proves that the proposed technique allows checking the soundness and completeness of the design model with respect to the operational and control behaviors. Moreover, automatic translation procedures from the design models to the NuSMV model checker\u27s code and a verification tool are reported in the paper. © 2012 Elsevier Ltd. All rights reserved

Reputation of communities of Web services - Preliminary investigation

Web services communities can be seen as virtual clusters that agglomerate Web services with the same functionality (e.g., FlightBooking). However, selecting a community to deal with is a challenging task to users and providers. Reputation, besides other selection criteria, has been widely used for evaluating and ranking candidates. Interestingly, the definition of community reputation from the perspective of users differs from the perspective of Web service providers. In this paper, we introduce a reputation-based Web services community architecture and define some of the petformance metrics that are needed to assess the reputation of a Web service community as perceived by users and providers. © 2008 IEEE

Meningkatkan Hasil Belajar Fisika Dengan Menerapkan Model Pembelajaran Kooperatif Tipe Two Stay Two Stray

Rendahnya hasil belajar siswa selama proses pembelajaran disebabkan kurang efektifnya model pembelajaran yang digunakan oleh guru. Sehingga dilakukan penelitian yang bertujuan meningatkan hasil belajar siswa kelas VIII-B SMPN 2 Batu Ampar pada materi ajar gelombang dan bunyi dengan menerapkan model pembelajaran koopreratif tipe TSTS. Tujuan khusus penelitian ini adalah mendeskripsikan keterlaksanaan RPP, hasil belajar, keterampilan sosial, dan respon siswa selama proses pembelajaran. Jenis penelitian ini adalah Penelitian Tindakan Kelas (PTK) model Kemmis dan Taggart yang terdiri dari 3 siklus, setiap siklus meliputi perencanaan, pengamatan dan observasi serta refleksi. Subjek penelitian adalah 24 siswa kelas VIII-B.Pengumpulan data menggunakan tes, observasi, angket, dan dokumentasi.Analisis data secara deskriftif kualitatif dan deskriftif kuantitatif. Hasil penelitian menunjukan peningkatan: 1) keterlaksanaan RPP siklus I 77,14%, siklus II 88,39%, dan siklus III 96,79%, 2) keterampilan sosial siswa meliputi mendengarkan / memperhatikan penjelasan guru, berdiskusi / kerjasama antar siswa dalam kelompok, mematuhi aturan main pembelajaran, menyampaikan pendapat, dan mendengarkan pendapat teman, pada siklus I berkatagori cukup baik, siklus II berkatagori baik, dan siklus III berkatagori baik, 3) ketentuan hasil belajar siswa secara klasikal pada siklus I 66,67%, siklus II 79,17% , dan siklus III 95,83%. Sebagian besar siswa kesulitan menganalisis soal hitungan, 4) respon positif siswa terhadap pembelajaran tipe TSTS.Kesimpulan di atas penerapan pembelajaran kooperatif tipe TSTS efektif dalam meningkatkan hasil belajar siswa kelas VIII-B SMPN 2 Batu Ampar pada materi ajar gelombang dan bunyi

On the reputation of communities of web services

Web services communities are virtual clusters that agglomerate Web services with the same functionality. However, selecting the best community to deal with is challenging to both users and providers. Reputation has been widely used for evaluating and ranking candidates. In this paper, we introduce a reputation-based Web services community architecture and define some of the performance metrics that are needed to assess the reputation of a Web service community as perceived by the users and providers. Copyright 2008 ACM

Chemical Composition and the Anticancer, Antimicrobial, and Antioxidant Properties of Acacia Honey from the Hail Region: The in vitro and in silico Investigation

In consideration of the emergence of novel drug-resistant microbial strains and the increase in the incidences of various cancers throughout the world, honey could be utilized as a great alternative source of potent bioactive compounds. In this context, this study pioneers in reporting the phytochemical profiling and the antimicrobial, antioxidant, and anticancer properties of Acacia honey (AH) from the Hail region of Saudi Arabia, assessed using in vitro and molecular docking approaches. The phytochemical profiling based on high-resolution liquid chromatography-mass spectrometry (HR-LCMS) revealed eight compounds and three small peptide-like proteins as the constituents. The honey samples exhibited promising antioxidant activities (DPPH-IC50 = 0.670 mg/mL; ABTS-IC50 = 1.056 mg/mL; β-carotene-IC50 > 5 mg/mL). In the well-diffusion assay, a high mean growth inhibition zone (mGIZ) was observed against Staphylococcus aureus (48.33 ± 1.53 mm), Escherichia coli ATCC 10536 (38.33 ± 1.53 mm), and Staphylococcus epidermidis ATCC 12228 (39.33 ± 1.15 mm). The microdilution assay revealed that low concentrations of AH could inhibit the growth of almost all the evaluated bacterial and fungal strains, with the minimal bactericidal concentration values (MBCs) ranging from 75 mg/mL to 300 mg/mL. On the contrary, high AH concentrations were required to kill the tested microorganisms, with the minimal bactericidal concentration values (MBCs) ranging from approximately 300 mg/mL to over 600 mg/mL and the minimal fungicidal concentration values (MFCs) of approximately 600 mg/mL. The AH exhibited effective anticancer activity in a dose-dependent manner against breast (MCF-7), colon (HCT-116), and lung (A549) cancer cell lines, with the corresponding IC50 values of 5.053 μg/mL, 5.382 μg/mL, and 6.728 μg/mL, respectively. The in silico investigation revealed that the observed antimicrobial, antioxidant, and anticancer activities of the constituent compounds of AH are thermodynamically feasible, particularly those of the tripeptides (Asp-Trp-His and Trp-Arg-Ala) and aminocyclitol glycoside. The overall results highlighted the potential of AH as a source of bioactive compounds with significant antimicrobial, antioxidant, and anticancer activities, which could imply further pharmacological applications of AH

Impact of opioid-free analgesia on pain severity and patient satisfaction after discharge from surgery: multispecialty, prospective cohort study in 25 countries

Background: Balancing opioid stewardship and the need for adequate analgesia following discharge after surgery is challenging. This study aimed to compare the outcomes for patients discharged with opioid versus opioid-free analgesia after common surgical procedures.Methods: This international, multicentre, prospective cohort study collected data from patients undergoing common acute and elective general surgical, urological, gynaecological, and orthopaedic procedures. The primary outcomes were patient-reported time in severe pain measured on a numerical analogue scale from 0 to 100% and patient-reported satisfaction with pain relief during the first week following discharge. Data were collected by in-hospital chart review and patient telephone interview 1 week after discharge.Results: The study recruited 4273 patients from 144 centres in 25 countries; 1311 patients (30.7%) were prescribed opioid analgesia at discharge. Patients reported being in severe pain for 10 (i.q.r. 1-30)% of the first week after discharge and rated satisfaction with analgesia as 90 (i.q.r. 80-100) of 100. After adjustment for confounders, opioid analgesia on discharge was independently associated with increased pain severity (risk ratio 1.52, 95% c.i. 1.31 to 1.76; P < 0.001) and re-presentation to healthcare providers owing to side-effects of medication (OR 2.38, 95% c.i. 1.36 to 4.17; P = 0.004), but not with satisfaction with analgesia (beta coefficient 0.92, 95% c.i. -1.52 to 3.36; P = 0.468) compared with opioid-free analgesia. Although opioid prescribing varied greatly between high-income and low- and middle-income countries, patient-reported outcomes did not.Conclusion: Opioid analgesia prescription on surgical discharge is associated with a higher risk of re-presentation owing to side-effects of medication and increased patient-reported pain, but not with changes in patient-reported satisfaction. Opioid-free discharge analgesia should be adopted routinely

Laparoscopic Cholecystectomy in Situs Inversus Totalis

Situs inversus totalis is a rare defect with genetic predisposition that may present difficulties in the diagnosis and management of abdominal pathology due to mirror-image anatomy. Occasionally, these patients may present with acute cholecystitis. Laparoscopic cholecystectomy is the standard treatment for symptomatic cholelithiasis; however, the technique has to be varied for the treatment of situs inversus totalis. To the best of our knowledge, we report the first case in Saudi Arabia of a successful laparoscopic cholecystectomy in a patient with situs inversus totalis. The technique is presented and the pitfalls are discussed with a review of the relevant literature

Web Services Synchronization in Composition Scenarios

This paper discusses Web services synchronization at the composition level. Synchronization aims at assisting independent parties coordinate their actions and thus, avoid conflicts. Our previous work on synchronization primarily focused on the component level and shed the light on two types of behaviors related to specifying Web services. The control behavior defines the business logic that underpins the functioning of a Web service, and the operational behavior regulates the execution progress of this control behavior by stating the actions to carry out and the constraints to put on this progress. Control and operational behaviors continue to be used to specify composite Web services with respect to the orchestration schemas that these composite Web services have to comply with whether centralized or peer-to-peer. As a result, various types of messages to achieve synchronization are developed per type of orchestration schema. Experiments showing the use of these messages are reported in this paper as well