Clinical importance of preoperative and postoperative prognostic nutritional index in patients with pancreatic ductal adenocarcinoma

Masahide Ikeguchi,Keisuke Goto,June Watanabe,Shoichi Urushibara,Tomohiro Osaki,Kanenori Endo,Shigeru Tatebe,Seiichi Nakamura 한국간담췌외과학회 2019 Annals of hepato-biliary-pancreatic surgery Vol.23 No.4

Backgrounds/Aims: The prognostic nutritional index (PNI) is based on the albumin concentration and absolute lymphocyte count and is designed to assess the nutritional and immunological status of patients. In this study, we evaluated the prognostic importance of the preoperative and postoperative PNI in patients who underwent curative resection of pancreatic ductal adenocarcinoma (PDAC). Methods: From 2006 to 2017, 50 patients with PDAC underwent curative resection at our hospital. We performed distal pancreatectomy (DP) with splenectomy in 15 patients, pancreaticoduodenectomy (PD) in 27 patients, PD combined with portal vein partial resection in 6 patients, and total pancreatectomy with splenectomy in 2 patients. We compared the preoperative PNI and postoperative PNI (1 and 2 months postoperatively) and analyzed the prognostic importance for these patients. Results: The mean PNI significantly decreased from 45.5 preoperatively to 39.8 at 1 month postoperatively (p<0.001), but recovered to 42.7 at 2 months postoperatively. In 23 patients, the PNI at 2 months postoperatively recovered to the preoperative level (recovered group), but in the remaining 27 patients, the PNI at 2 months postoperatively did not reach the preoperative level (non-recovered group). The overall median survival time in the recovered group (29 months) was significantly longer than that in the non-recovered group (12 months, p=0.003). The multivariate overall analysis demonstrated that good recovery of the postoperative PNI was strongly correlated with a better prognosis. Conclusions: Effective postoperative nutrition may have a prognostic benefit for patients with operable PDAC.

A Platform of Service Registry to Discover Service Resources in Ubiquitous Network

BenYan,Hua-Ping Yao,Masahide Nakamura,Shinsuke Matsumoto,Hideharu Seto 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9

In a ubiquitous network, a variety of things such as environmental sensor, home appliance and mobile phone are connected to an information network, which can be regarded as a service resource. Combined via network, these service resources can provide value-added ubiquitous services anywhere at anytime. In a future ubiquitous network, it is expected to achieve an adaptive service platform, which can dynamically integrate various service resources to provide adaptive and context-aware services. This paper presents a new service registry platform named UBI-REGI, which is used to support efficient and dynamic discovery of service resources in a ubiquitous network. To define the scope of operation within the real world and IT world, UBI-REGI divides every service operation into three categories: source service, transformation service and sink service. Furthermore, UBI-REGI specifies meta-data like physical location or device owner to manage physical devices, in addition to the conventional meta-data like service name, purpose and description. In order to enable UBI-REGI to be easily used by external program, this paper designs and implements UBI-REGI API by using Web service technologies. With this API, external applications can find service resources by queries of service category, location, purpose keywords, and so on. As a case study, this paper demonstrates an environment continue service in a home network system to prove the feasibility of this proposal.

Characterizing Semantic Warnings of Service Description in Call Processing Language on Internet Telephony

Pattara Leeraplute,Tomokazu Taki,Masahide Nakamura,Tohru Kikuno 대한전자공학회 2002 ITC-CSCC :International Technical Conference on Ci Vol.2002 No.7

The Improvement and Evaluation of the Implementation Ability for Deriving Timing Constraints Context in Service-Oriented Home Network

BenYan,Hua-Ping Yao,Masahide Nakamura,Shinsuke Matsumoto 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.12

Home Network System (HNS) is comprised of networked home appliances and sensors to provide value-added and more powerful services. In order to build high- level HNS service by integrating multiple appliances and sensors, our earlier study proposes a method to derive timing constraints context based on Sensor Service Framework (SSF, which deploys sensor devices as web services to achieve easy development of context-aware application). That method divides timing constraints into two types: the sequential timing constraint and the continuous timing constraint. A high-level context can be defined as conditions expression based on the above two types. Moreover, we present a timer service to implement timing constraints context within SSF, and demonstrate how a high-level context with timing constraint is registered and detected in a real home network system. However, to create high-level context with timing constraints, the developer needs to know the details about pre-existing context of HNS, and also needs the ability to analyze and implement complex logic to detect a high-level timing constraints context. This limitation impedes the efficient creation of high-level context in HNS. Therefore, we propose a method to collectively manage the information of a pre- existing context of HNS in this paper, by which the developer can create high-level timing constraints context more easily than before. As a case study, we implement Enter-Leave context and TV Left On context, and execute an evaluation to prove the effectiveness of this proposal.

A Proposal for Deriving Timing Constraint Context on Using Multiple Sensor Web Servers in Service-Oriented Home Network

BenYan,Hua-Ping Yao,Masahide Nakamura,Shinsuke Matsumoto 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.8

The recent ubiquitous/pervasive technologies allow general household appliances to be connected within the network at home which is named home network system (HNS, for short). The great advantage of HNS is that it provides more value-added and powerful services by integrating multiple appliances and various sensors. Especially, sensor applications in HNS become much more important technology to build a high-level HNS service. In our earlier study, we have proposed the sensor service framework (SSF, for short) in the home network system for developing context-aware service, which wraps various sensor devices by web services to achieve easy development of context-aware service. In the SSF, a context was defined by a condition over a single sensor, or multiple sensors that derived by logical or arithmetic operations. However, the contexts were limited to the ones that can be defined by current values of the sensors, and can not describe the timing constraint relation in context on using multiple sensor web servers such as “after opening the door for 2 seconds, passed the hall” or “setting on the sofa”, and hindered us from creating high-level timing constraints context. In this paper, we propose a method for deriving the timing constraints context bases on the extended study of SSF. We first divide timing constraint in the context into two types: the sequential timing constraint and the continuous timing constraint. By using two types of timing constraint, the high-level context can be defined as conditions by using multiple sensors. After this, we also present a timer service to implement the timing constraints context within the SSF. We finally demonstrate how the high-level contexts with the timing constraints are registered and detected in a real home network system.

Detecting Feature Interactions in Telecommunication Services by Bounded Model Checking

Tomoyuki Yokogawa,Tatsuhiro Tsuchiya,Masahide Nakamura,Tohru Kikuno 대한전자공학회 2003 ITC-CSCC :International Technical Conference on Ci Vol.2003 No.7

Deriving Safety Properties for Home Network System Based on Goal-Oriented Hazard Analysis Model

Ben Yan,Ken-ichi Matsumoto,Masahide Nakamura 보안공학연구지원센터 2009 International Journal of Smart Home Vol.3 No.1

The home network system (HNS, for short) is comprised of networked home appliances, which achieves various value-added services for home users. Assuring safety of the HNS and the services is a crucial issue. However, safety properties to be verified against the HNS have been given in an ad-hoc manner. This paper presents a systematic method that can derive the verifiable safety properties from a given HNS model and hazard contexts. Specifically, we first define a hazard analysis model for the HNS consisting of four levels of abstractions. We then conduct a goal-oriented analysis to specify logical relations between the adjacent abstraction levels. The analysis yields cause-and-effect chains from the abstract hazard contexts to the concrete attributes and operations of HNS objects (appliances, services, environment). Finally, the safety properties and their responsible operations are derived from the complete model, which give the strong rationale of the safety of the HNS.

Improving Reusability of Hazard Analysis Model with Hazard Template for Deriving Safety Properties of Home Network System

Ben Yan,Ken-ichi Matsumoto,Masahide Nakamura,Lydie du Bousquet 보안공학연구지원센터 2009 International Journal of Smart Home Vol.3 No.2

The recent ubiquitous/pervasive technologies allow general household appliances to be connected within the network at home. The home network system (HNS, for short) is comprised of such networked appliances to provide various services and applications for home users. The great advantage of HNS lies in integrating (or orchestrating) features of multiple appliances, which yields more value-added and powerful services. We call such services HNS integrated services. In developing and providing a HNS integrated service, the service provider must guarantee that the service is safe for inhabitants, house properties and their surrounding environment. As for the HNS integrated services, however, we have to consider the safety much more carefully. This paper presents a systematic method that can derive the verifiable safety properties from a given HNS model and hazard contexts. Specifically, we propose the HNS Hazard Analysis Model (HNS-HAM) for deriving safety properties with conducting a goal-oriented analysis. The analysis yields cause-and-effect chains from the abstract hazard contexts to the concrete attributes and operations of HNS objects (appliances, services, and environment). Then the safety properties and their responsible operations are derived from the complete model, which give the strong rationale of the safety of the HNS. On the other hand, to make the proposed method more practical, it is necessary to save the analysis cost while appliances and services in the HNS are added or changed. For this, we have also proposed the notion of the hazard template, which characterizes the generic portion of the HNS-HAM. For every hazard context, the hazard template is supposed to be constructed once by the safety experts. The template can be reused for various kinds of the HNS objects for the common hazard context. The reusable templates make it possible to save the analysis cost and improve the quality of the HNS-HAM.