An operational approach to validate the path of BGP

BGP (Border Gateway Protocol) is a fundamental component of the current Internet infrastructure. However, BGP is vulnerable to a variety of attacks, since it cannot ensure the authenticity of the path attributes announced by BGP routers. Despite several solutions have been proposed to address this vulnerability, none of them is operational in real-world due to their immense impact on original BGP. In this paper, we propose a Deployable Path Validation Authentication scheme, which can effectively validate the path of BGP. Through analysis and simulation we show that this scheme has little impact on the performance and memory usage for the original BGP, and can be adopted in practice as an operational approach.

Sexing accuracy and indicators of maturation status in captive Murray cod Maccullochella peelii peelii using non-invasive ultrasonic imagery

Macroscopic- and histological-based assessments of gonad condition were compared with ultrasound images to determine the feasibility of this technology as a non-invasive diagnostic tool for identifying sex and assessing maturation status of Murray cod. Four age-classes (1⁺, 2⁺, 3⁺ and 6⁺ years), were sub-sampled at monthly intervals throughout their annual reproductive cycle and scanned with a 5 MHz linear transducer. An interpretation of sex was made from the resulting images and maximum cross-sectional gonad diameter and area were recorded. Fish were subsequently dissected to confirm gender, and the weights and maturation status of gonads determined and then compared with their respective image profile. Ovaries of females were usually a distinctive feature in ultrasound images, being particularly obvious in older and/or more developed fish. In contrast, the identification of male testis was more problematic. Nonetheless, identifying sex from ultrasound images was consistently achieved by recording the presence/absence of a female ovary (96% total sexing accuracy). Maximum cross-sectional ovary diameter and area were highly correlated with gonad weight (r² = 0.90 and 0.89, respectively) suggesting that indices of maturation status, comparable to the gonadosomatic index (GSI), can be obtained non-destructively from ultrasound scans of females. A less distinct relationship occurred between these dimensions and weight of testes (r² = 0.41). Significant increases (P < 0.05) in mean gonad index (GI, calculated from gonad diameter) occurred for most gonad development stages. However, differences in mean GI between maturation stages were confounded by phenotypic variability, indicating that GI may be limited to population level studies. Nevertheless, ultrasound images of ovaries at each development stage were visually distinctive and enabled qualitative evaluations of maturity, thereby complementing quantitative GI assessments. Repeated serial-monitoring of the same population using ultrasound appears to have great potential for tracking maturation-induced changes in broodfish.

Diagnosing borderline personality disorder : examination of how clinical indicators are used by professionals in the health setting

This paper reviews the history of the recognition of borderline personality disorder as a clinical disorder, followed by a review of the contemporary practice of diagnosing borderline personality disorder in psychiatric settings. Many researchers have cautioned against the conflation of difficult patients with the diagnostic category of borderline personality disorder. The current study examines how clinical indicators used to screen for this complex disorder differ across service settings, professions, specialised training and years of clinical experience. A purpose-designed survey was administered to 108 mental and emergency medicine health practitioners across an Australian health service and a New Zealand health service to record the level of significance placed on different clinical indicators in the application of the diagnosis of borderline personality disorder. A heavy reliance was placed on observable behavioural symptoms, such as self-mutilation and impulsive behaviours that are self-damaging, in the screening of borderline personality disorder as a psychiatric diagnosis. Statistically significant differences were found between emergency medical staff and mental health clinicians in their use of diagnostic indicators of borderline personality disorder, χ²(4) = 17.248, p = .002. Implications of these findings for the screening, assessment and diagnosis of patients with borderline personality disorder are discussed.

Generation of statements for the development of clinical indicators for mental heath nursing in New Zealand : achieving a bicultural focus

Aim : In this paper, the first of 4 stages of a large study aiming to develop culturally and clinically valid clinical indicators to flag the achievement of mental health nursing standards of practice in New Zealand are described.

Methods : A bicultural design was employed throughout the research project to ensure that nurses' views of practice and the cultural differences between New Zealand's indigenous Maori and non-Maori peoples could be identified. Accordingly, separate focus groups of Maori- and non-Maori-experienced mental health nurses were asked to develop lists of statementd reflective of the Australian and New Zealand College of Mental Health Nurses' Standards of Practice in New Zealand.

Results : The focus group participants produces 473 statements, which were synthesized into 190 clinical indicator statements. In keeping with the bicultural research design, Maori and non-Maori data were analysed separately until the data were merged to provide a single set of indicator statements. Although both Maori and non-Maori groups wrote statements relevant to clinical practice, there was a difference in the way the 2 groups addressed cultural issues. The Maori focus group wrote statements about cultural issues for 4 of the 6 Standards of Practice, whereas the non-Maori focus group participants wrote statements about cultural issues for only the Standard focusing on cultural safety.

Conclusion : The research design of this project in mental health nursing was unique in that it sought the perspectives of both indigenous and non-indigenous nurses about quality mental health nursing practice related to the professional standards of practice. The involvement of Maori and non-Maori mental health nurses enhanced the cultural and clinical validity of the study and the obtained from it. The bicultural approach adopted for the study highlights the need for more mental health nursing research involving indigenous partners.

Consumer notes clinical indicators : determining inter-rater reliability with multiple users, nominal categories and several cases

A method of determining inter-rater reliability when there are multiple raters, nominal rating categories and several cases is described and applied in the development of an instrument for auditing the ANZCMHN (1995) standards of practice for mental health nursing in New Zealand. Clinical statements (n=41) from the O’Brien et al (2002a, 2003) study, which reflected nursing behaviours contributing to the achievement of the standards of practice, were used to audit consumer files. During two Phases, the clinical indicator statements were refined and rules for judging the achievement of each statement from case note documentation were established. The resultant statements have adequate inter-rater reliability for the assessment of nursing practice with respect to the ANZCMHN (1995) standards of practice.

New Zealand development and trial of mental health nursing clinical indicators - a bicultural study

This paper describes the development and validation of bicultural clinical indicators that measure achievement of mental health nursing practice standards in New Zealand (ANZMCHN, 1995, Standards of practice for mental health nursing in New Zealand. ANZCMHN, Greenacres). A four-stage research design was utilised including focus groups, Delphi surveys, a pilot, and a national field study, with mental health nurses and consumers as participants. During the national field study, consumer files (n=327) from 11 District Health Boards, and registered nurses (n=422) completed an attitude questionnaire regarding the regularity of specific nursing and service activities. Results revealed a variation in the mean occurrence of the clinical indicators in consumer case notes of 18.5–89.9%. Five factors with good internal consistency, encompassing domains of mental health nursing required for best practice, were derived from analysis of the questionnaire. This study presents a research framework for developing culturally and clinically valid, reliable measures of clinical practice.

A study on energy performance of hotel buildings in Singapore

This paper presents a study on energy performance of Singapore's hotel buildings. Energy consumption data and other pertinent information were collected from 29 quality hotels through a national survey. Building features and operational characteristics contributing to the variations in hotel energy performance were discussed. The annual average total energy use intensity (EUI) in these hotels is 427 kWh/m2. Electricity and gas are used in all sampled hotels, and some hotels also use diesel to power standby generator or hot water boiler. We also investigated relationships between electricity consumption and number of occupied rooms in individual hotels; the weak correlations found indicate it is necessary to improve energy management when occupancy rate is low. Besides, Pearson correlations between hotel energy use intensity and possible explanatory indicators revealed that three-star hotels differ from high class establishments in energy use. Worker density and years after the last major energy retrofit were also found to be highly correlated to hotel building energy use intensity. Also discussed in this paper is the effect of weather conditions on electricity consumption of the hotels.