Garuda - Garba Rujukan Digital

Secure Communication and Information Exchange using Authenticated Ciphertext Policy Attribute-Based Encryption in Mobile Ad-hoc Network Huda, Samsul; Sudarsono, Amang; Harsono, Tri
EMITTER International Journal of Engineering Technology Vol 4, No 1 (2016)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

MANETs are considered as suitable for commercial applications such as law enforcement, conference meeting, and sharing information in a student classroom and critical services such as military operations, disaster relief, and rescue operations. Meanwhile, in military operation especially in the battlefield in freely medium which naturally needs high mobility and flexibility. Thus, applying MANETs make these networks vulnerable to various types of attacks such aspacket eavesdropping, data disseminating, message replay, message modification, and especially privacy issue. In this paper, we propose a secure communication and information exchange in MANET with considering secure adhoc routing and secure information exchange. Regarding privacy issue or anonymity, we use a reliable asymmetric encryption which protecting user privacy by utilizing insensitive user attributes as user identity, CP-ABE (Ciphertext-Policy Attribute-Based Encryption) cryptographic scheme. We also design protocols to implement the proposed scheme for various battlefied scenarios in real evironment using embedded devices. Our experimental results showed that the additional of HMAC (Keyed-Hash Message Authentication Code) and AES (Advanced Encryption standard) schemes using processor 1.2GHz only take processing time about 4.452 ms,Â we can confirm that our approach by using CP-ABE with added HMAC and AES schemes make low overhead.

IMPLEMENTATION OF INFORMATION SYSTEM TOWARDS HEALTH SYSTEM STRENGTHENING IN INDONESIA: A POLICY BRIEF Veruswati, Meita; Asyary, Al
Public Health of Indonesia Vol. 3 No. 3 (2017): July - September
Publisher : YCAB Publisher & IAKMI SULTRA

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A Similarity-Ranking Method on Semantic Computing for Providing Information-Services in Station-Concierge System Yokoyama, Motoki; Kiyoki, Yasushi; Mita, Tetsuya
EMITTER International Journal of Engineering Technology Vol 5, No 1 (2017)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

The prevalence of smartphones and wireless broadband networks have been progressing as a new Railway infomration environment.ãAccording to the spread of such devices and information technology, various types of information can be obtained from databases connected to the Internet. One scenario of obtaining such a wide variety of information resources is in the phase of userâs transportation. This paper proposes an information provision system, named the Station Concierge System that matches the situation and intention of passengers. The purpose of this system is to estimate the needs of passengers like station staff or hotel concierge and to provide information resources that satisfy userâs expectations dynamically. The most important module of the system is constructed based on a new information ranking method for passenger intention prediction and service recommendation. This method has three main features, which are (1) projecting a user to semantic vector space by using her current context, (2) predicting the intention of a user based on selecting a semantic vector subspace, and (3) ranking the services by a descending order of relevant scores to the userâ intention. By comparing the predicted results of our method with those of two straightforward computation methods, the experimental studies show the effectiveness and efficiency of the proposed method. Using this system, users can obtain transit information and service map that dynamically matches their context.

PRIVATE INFORMATION ARRIVAL AT INDONESIA STOCK EXCHANGE, REALITY OR IMAGINARY? U-SHAPED RETURN VARIANCE CURVE VERIFICATION Setiyono Mihardjo; Sumiyana Sumiyana
Journal of Indonesian Economy and Business (JIEB) Vol 27, No 3 (2012): September
Publisher : Faculty of Economics and Business, Universitas Gadjah Mada

This research investigates occurrence of private information arrival in Indonesia Stock Exchange (IDX). The occurrence comes from overnight nontrading session as well as lunch-break hour. Lunch-break return variance decreases two times in comparison with early morning and lately afternoon return variances. This variance is due to private information arrival. This study finds that opening prices form the full day U-shape. It means that opening price causes stock mispricing. It also be concluded that lunch-break session produces the bottom line on the U-shape to move downward. U-shaped curve during morning until the end-afternoon session occurs. Therefore, the line formationimplies the existence of private information arrival that is in short-lived.Keywords: U-shaped curve, private and public information

TASK-TECHNOLOGY FIT AND PERSON-JOB FIT: A BEAUTY CONTEST TO IMPROVE THE SUCCESS OF INFORMATION SYSTEMS Woro Dwi Suryani; Sumiyana Sumiyana
Journal of Indonesian Economy and Business (JIEB) Vol 29, No 2 (2014): May
Publisher : Faculty of Economics and Business, Universitas Gadjah Mada

This study raises the issue that information system success could be enhanced by complementing other factors. This study investigates the success of information systems by inducing2 the task-technology fit (TTF) and person-job fit (PJF) into the DeLone and McLean model. This study aims to examine, among the two induced factors, which one is able to explain and improve the success of the information systems implementation. The results of this study indicate that the TTF explains the models’ goodness of fit better than that of the PJF when induced into the modified DeLone and McLean model. This study implies this in terms of both theory and practice. Theoretically, this research presents an alternative research model that can be used to investigate the success of information systems by considering the aspect of the users’ cognitive suitability (the cognitive fit theory). Furthermore, practically, this study suggests the importance of focusing on users’ skills and competencies and, subsequently, management should do so. Additionally, the TTF recommends a simple proposition that it could be attached immediately into the individuals’ skills and competencies. However, the PJF needs to be deeply embedded in the job’s qualifications and recruitment policies.

ASYMMETRIC INFORMATION IN THE IPO UNDERWRITING PROCESS ON THE INDONESIA STOCK EXCHANGE: PRICING, INITIAL ALLOCATION, UNDERPRICING, AND PRICE STABILIZATION Arni Utamaningsih; Eduardus Tandelilin; Suad Husnan; R. Agus Sartono
Journal of Indonesian Economy and Business (JIEB) Vol 28, No 3 (2013): September
Publisher : Faculty of Economics and Business, Universitas Gadjah Mada

This study examines the IPO trading based on asymmetric information among heterogeneous investors. An underwriter plays an active role in the process of the IPO where underpricing is a central issue. The underwriter(s) manages the IPO trading by determining the offered price range and a discriminatory treatment between institutional and individual investors. The underwriter prioritizes institutional investors, especially when they show strong buying interests at the time of book building. The results prove that underpricing is higher when the IPO pricing is closer to the upper limit of the price range. We find that underpricing is higher when the allocation of shares to institutional investors is larger.

Strategi IT Dalam Human Resource Information System (HRIS) Untuk Mencapai Strategi Green IT Sulastri, Heni
Jurnal Rekayasa Sistem & Industri Vol 4 No 02 (2017): Jurnal Rekayasa Sistem & Industri - Desember 2017
Publisher : School of Industrial and System Engineering, Telkom University

Companies not only need a strategy to implement the business process, companies also require IT strategy must be aligned with the business strategy. IT strategic planning can provide a clear picture of the future of the company, utilization of resources on the things that are important or quantitative in nature and can be understood by the environmental conditions that affect the company. a prestigious consultant believes the technology strategy developed at this time one of them is a green IT strategy. Green IT is seen as an innovation because there are many people who give new insights into the perception or green IT could affect the existing knowledge and experience in this case is associated with information systems and technology to become an IT strategy. Based on the above figures and tables, of each sub-system on HRIS, and aspects of green IT strategies are assessed, then the strategy aspect of the challenge (chalenges) is the largest sub-system of recruitment. Where is the part that the use of resources and information technology still requires energy and the amount is large and consistent with the hypothesis that in order to create green IT, the use of computer resources in an efficient way to improve the economic viability, social responsibility and environmental impacts can be realized by determining the right IT strategy (see table 1). while Human resource information system (HRIS) that can be created innovative by implementing green IT strategy. PT Pertamina (Persero) has implemented the system in improving the performance and reducing the cost and resources that are not needed. For example, excessive use of paper in the preparation of reports, information and workforce benefits.

THE INFLUENCE OF INFORMATION, ORGANIZATIONAL OBJECTIVES AND TARGETS, AND EXTERNAL PRESSURE TOWARDS THE ADOPTION OF PERFORMANCE MEASUREMENT SYSTEM IN PUBLIC SECTOR Anthonius H. Citra Wijaya; Rusdi Akbar
Journal of Indonesian Economy and Business (JIEB) Vol 28, No 1 (2013): January
Publisher : Faculty of Economics and Business, Universitas Gadjah Mada

This research studies the use of performance measurement systems (PMS) in public sector. It provides empirical evidence on the influencing factors determined by the use of PMS in Indonesian local government. Institutional theory, especially institutional isomorphism, is utilized as a theoretical lens to further explain the findings. The factors under examination are information, goals and objectives of the organization and external pressure. The context of the study is the Provincial Government of Yogyakarta (including Bantul, Gunungkidul, Kulonprogo, Sleman, and the City of Yogyakarta). This research uses mixed research method and employs Partial Least Square (PLS) and Thematic Content Analysis (TCA) to analyze and interpret the data. The results shows that information and external pressures have a positive and significant effect on the use of PMS in local government operations. In turn, information regarding incentive has a positive and significant effect on the use of PMS. In short, goals and objectives of the organization, information and external pressures influence the use of PMS.

THE EFFECTS DISPOSITIONAL AND SITUATIONAL COGNITIVE FACTORS ON THE INTENTION TO USE INTERNET: AN EMPIRICAL STUDY OF THE ACCEPTANCE OF INFORMATION TECHNOLOGY AT UNIVERSITAS BENGKULU Willy Abdillah
Journal of Indonesian Economy and Business (JIEB) Vol 24, No 2 (2009): May
Publisher : Faculty of Economics and Business, Universitas Gadjah Mada

The objective of this research is to investigate the effect of dispositional personality and situational cognitive factors on the intention to use the internet. Personality factors were measured by five variables openness to experience, conscientiousness, extraversion, agreeableness and neuroticism. Meanwhile, situational cognitive factors were measured by perceived ease of use, perceived usefulness and self-efficacy. Survey was conducted to 323 students of Faculty of Economics, Universitas Bengkulu, include extension and Magister Management students programme. This research uses non-probability sampling procedure with purposive-judgment method. Primary data were gathered using closedquestion form questionnaire. Hypotheses testing were conducted using Partial Least Square with software SmartPLS version 2.0.M3. Results showed that openness to experience, perceived usefulness and self-efficacy significantly affect intention to use internet. Meanwhile, situational cognitive factors were better predictor than personality factors on the intention to use internet. This suggests that the application of information technology acceptance and adoption theory dominantly based on perceptual cognitive factors rather than personality. The current study contributes to higher education managers in terms of how to manage common problems of information system resistance.Keywords: dispositional personality, situational cognitive, Information Technology Acceptance, and Information System.

EARNINGS ANNOUNCEMENTS AND COMPETING INFORMATION: THE INDONESIAN EVIDENCE Dedhy Sulistiawan; Jogiyanto Hartono; Eduardus Tandelilin; Supriyadi Supriyadi
Journal of Indonesian Economy and Business (JIEB) Vol 29, No 1 (2014): January
Publisher : Faculty of Economics and Business, Universitas Gadjah Mada

The main purpose of this study is to provide empirical evidence of the relationship between investors’ responses to two events, which are, (1) earnings anouncements, and (2) technical analysis signals, as competing information. This study is motivated by Francis, et al. (2002), whose study used stock analyst’s recommendations as competing information in the U.S stock market. To extend that idea, this study uses technical analysis signals as competing information in the Indonesian stock market. Using Indonesian data from 2007-2012, this study shows that there are price reactions on the day of a technical analysis signal’s release, which is prior to earnings announcements. It means that investors react to the emergence of competing information. Reactions on earnings announcements also produce a negative relationship with the reaction to a technical analysis signal before an earnings announcement. This study gives evidence about the importance of technical analysis as competing information to earnings announcements.

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