Anomaly Detection Using LibSVM Training Tools

Jung-Chun Liu,Chu-Hsing Lin,Jui-Ling Yu,Wei-Shen Lai,Chia-Han Ho 보안공학연구지원센터 2008 International Journal of Security and Its Applicat Vol.2 No.4

Intrusion detection is the means to identify the intrusive behaviors and provide useful information to intruded systems to respond fast and to avoid or reduce damages. In recent years, learning machine technology is often used as a detection method in anomaly detection. In this research, we use support vector machine as a learning method for anomaly detection, and use LibSVM as the support vector machine tool. By using this tool, we get rid of numerous and complex operations and do not have to use external tools for finding parameters as needed by using other algorithms such as the genetic algorithm. Experimental results show that high average detection rates and low average false positive rates in anomaly detection are achieved by our proposed approach.

Comparison of Serum Ketone Levels and Cardiometabolic Efficacy of Dapagliflozin versus Sitagliptin among Insulin-Treated Chinese Patients with Type 2 Diabetes Mellitus

Chi-Ho Lee,Mei-Zhen Wu,David Tak-Wai Lui,Darren Shing-Hei Chan,Carol Ho-Yi Fong,Sammy Wing-Ming Shiu,Ying Wong,Alan Chun-Hong Lee,Joanne King-Yan Lam,Yu-Cho Woo,Karen Siu-Ling Lam,Kelvin Kai-Hang Yiu 대한당뇨병학회 2022 Diabetes and Metabolism Journal Vol.46 No.6

Background: Insulin-treated patients with long duration of type 2 diabetes mellitus (T2DM) are at increased risk of ketoacidosis related to sodium-glucose co-transporter 2 inhibitor (SGLT2i). The extent of circulating ketone elevation in these patients remains unknown. We conducted this study to compare the serum ketone response between dapagliflozin, an SGLT2i, and sitagliptin, a dipeptidyl peptidase-4 inhibitor, among insulin-treated T2DM patients.Methods: This was a randomized, open-label, active comparator-controlled study involving 60 insulin-treated T2DM patients. Participants were randomized 1:1 for 24-week of dapagliflozin 10 mg daily or sitagliptin 100 mg daily. Serum β-hydroxybutyrate (BHB) levels were measured at baseline, 12 and 24 weeks after intervention. Comprehensive cardiometabolic assessments were performed with measurements of high-density lipoprotein cholesterol (HDL-C) cholesterol efflux capacity (CEC), vibration-controlled transient elastography and echocardiography.Results: Among these 60 insulin-treated participants (mean age 58.8 years, diabetes duration 18.2 years, glycosylated hemoglobin 8.87%), as compared with sitagliptin, serum BHB levels increased significantly after 24 weeks of dapagliflozin (P=0.045), with a median of 27% increase from baseline. Change in serum BHB levels correlated significantly with change in free fatty acid levels. Despite similar glucose lowering, dapagliflozin led to significant improvements in body weight (P=0.006), waist circumference (P=0.028), HDL-C (P=0.041), CEC (P=0.045), controlled attenuation parameter (P=0.007), and liver stiffness (P=0.022). Average E/e’, an echocardiographic index of left ventricular diastolic dysfunction, was also significantly lower at 24 weeks in participants treated with dapagliflozin (P=0.037).Conclusion: Among insulin-treated T2DM patients with long diabetes duration, compared to sitagliptin, dapagliflozin modestly increased ketone levels and was associated with cardiometabolic benefits.

Child maltreatment hospitalisations in Hong Kong: incidence rate and seasonal pattern

Ip, Patrick,Ho, Frederick Ka-wing,Chan, Ko Ling,Yip, Paul Siu-fai,Lau, Joseph Tak-fai,Wong, Wilfred Hing-sang,Chow, Chun-bong,Jiang, Fan BMJ Publishing Group Ltd 2016 Archives of disease in childhood Vol.101 No.12

<P><B>Objective</B></P><P>We investigated the incidence and seasonal patterns of child maltreatment hospitalisations in Hong Kong.</P><P><B>Design</B></P><P>A retrospective study of subjects aged under 19 years with a primary diagnosis of child maltreatment admitted to hospitals in Hong Kong from 2001 to 2010. Data were retrieved from the centralised database of all 42 public hospitals in the Hospital Authority.</P><P><B>Main outcome measures</B></P><P>Child maltreatment incidence rate.</P><P><B>Results</B></P><P>A consistent seasonal pattern was found for non-sexual maltreatment in children aged 6–18 years (p<0.001). Hospitalisations peaked in May and October but dipped in August and January. No significant seasonal patterns were found for sexual maltreatment or among children under 6 years. The seasonal pattern of child maltreatment coincided with the two school examination periods. The annual child maltreatment hospitalisation rate in Hong Kong in 2010 was 73.4 per 100 000 children under 19 years, more than double that in 2001.</P><P><B>Conclusions</B></P><P>A peculiar seasonal pattern and an alarming increasing trend in child maltreatment hospitalisation were observed in Hong Kong, which we speculated to be related to school examination stress and increasing socioeconomic disparity. Our findings highlighted differences in the trends of child maltreatment between Hong Kong and the West. Professionals and policymakers should be made aware of these trends and develop effective strategies to tackle child maltreatment.</P>

Genetic Algorithm for Shortest Driving Time in Intelligent Transportation Systems

Chu-Hsing Lin,Jung-Chun Liu,Chia-Han Ho,Jui-Ling Yu,Wei-Shen Lai 보안공학연구지원센터 2009 International Journal of Hybrid Information Techno Vol.2 No.1

The route guidance system, which provides driving advice based on traffic information about an origin and a destination, has become very popular along with the advancement of handheld devices and the global position system. Since the accuracy and efficiency of route guidance depend on the accuracy of the traffic conditions, the route guidance system needs to include more variables in calculation, such as real time traffic flows and allowable vehicle speeds. As variables considered by the route guidance system increase, the cost to compute multiplies. Since handheld devices have limited resources, it is not feasible to use them to compute the exact optimal solutions in real time systems by some well-known algorithm, such as the Dijkstra’s algorithm, which is usually used to find the shortest path with a map of reasonable numbers of vertices. To solve this problem, we propose to use the genetic algorithm to alleviate the rising computational cost. We use the genetic algorithm to find the shortest time in driving with diverse scenarios of real traffic conditions and varying vehicle speeds. The effectiveness of the genetic algorithm is clearly demonstrated when applied on a real map of modern city with very large vertex numbers.

Study on engineering properties of ready-mixed soil and slag

Tung-Tsan Chen,Chun-Ling Ho,Her-Yung Wang 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.21 No.5

The slag through sieve #4 replaced the natural fine aggregate in different proportions (0-50%) to make ready-mixed soil and slag (RMSAS). The fresh properties studied, and the concrete specimens were produced to test the hardened properties at different ages. Results showed that the workability of RMSAS decreases when the replacement increases. The unit weight increases with the replacement. The setting time extends when the replacement decreases and shortens when the replacement increases. The compressive strength, ultrasonic pulse velocity and hammer rebound value increase with the replacement. However, the high-replacement results decrease because of the expansion factor at late age. Resistivity is close and less than 20 kΩ-cm. After the industrial of steelmaking by-products are processed properly, they can be used in civil engineering, not only as a substitute for natural resources and to reduce costs, but also to provide environmental protection.

Assessment of compressive strength of cement mortar with glass powder from the early strength

Chien-Chih Wang,Chun-Ling Ho,Her-Yung Wang,Chi Tang 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.24 No.2

The sustainable development principle of replacing natural resources with renewable material is an important research topic. In this study, waste LCD (liquid crystal display) glass powder was used to replace cement (0%, 10%, 20% and 30%) through a volumetric method using three water-binder ratios (0.47, 0.59, and 0.71) to make cement mortar. The compressive strength was tested at the ages of 7, 28, 56 and 91 days. The test results show that the compressive strength increases with age but decreases as the water-binder ratio increases. The compressive strength slightly decreases with an increase in the replacement of LCD glass powder at a curing age of 7 days. However, at a curing age of 91 days, the compressive strength is slightly greater than that for the control group (glass powder is 0%). When the water-binder ratios are 0.47, 0.59 and 0.71, the compressive strength of the various replacements increases by 1.38-1.61 times, 1.56-1.80 times and 1.45-2.20 times, respectively, during the aging process from day 7 to day 91. Furthermore, a prediction model of the compressive strength of a cement mortar with waste LCD glass powder was deduced in this study. According to the comparison between the prediction analysis values and test results, the MAPE (mean absolute percentage error) values of the compressive strength are between 2.79% and 5.29%, and less than 10%. Thus, the analytical model established in this study has a good forecasting accuracy. Therefore, the proposed model can be used as a reliable tool for assessing the design strength of cement mortar from early age test results.

Effect of Vacuum Brazing on Corrosion Resistance of SAF 2205 and Superdex 64 Duplex Stainless Steel

Hsieh, Wen-Chin,Chiu, Liu-Ho,Ling, Yi-Chun 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.2

Duplex stainless steel has a combination of better mechanical strength and pitting corrosion resistance, but the precipitated brittle phase as б phase formed during the cooling from the welding procedure will rapidly degrade its properties. In order to avoid the precipitation of secondary phases in the welds, the effect of vacuum brazing on the properties of the welds of UNS S31803 (SAF 2205) and UNS S31200 (SuperDux64) duplex stainless steels has been investigated. Three fillers, such as copper foil, BNi-3 and BNi-7 Ni-based alloy, were used to evaluate the influence of chemical composition on the corrosion resistance. In air quench, a cooling rate of 0.85℃/s and the precipitation of б phase can be inhibited for those studied duplex stainless steels. Under the quenched state, the weight loss of UNS S31803 DSS dipped in 6%FeCl₃ solution at 45℃ for 24 hours is low. However, the precipitation of a phase in UNS S31803 was increased as the cooling rate decreased. When the cooling rate was decreased to 0.067℃/s, the weight loss of UNS S31803 was increased. Owing to the compositional difference between the filler and duplex stainless steel, the selective corrosion occurred at the interface of brazed joints soaked in 6% FeCl₃ solution for 24 hours.

Mental Health Consequences of Childhood Physical Abuse in Chinese Populations : A Meta-Analysis

Ip, Patrick,Wong, Rosa S.,Li, Sophia L.,Chan, Ko Ling,Ho, Frederick K.,Chow, Chun-bong SAGE Publications 2016 Trauma, violence & abuse Vol.17 No.5