Iftikar Z. Sutalaksana

TEKNIK JARINGAN SYARAF TIRUAN FEEDFORWARD UNTUK PREDIKSI HARGA SAHAM PADA PASAR MODAL INDONESIA

This paper presents a project of Web-based Distance Learning support system. The system has been built based on the Internet and World Wide Web facility. The system could be accessed with a web browser which is directed to a certain web server address so that students can do learning process just like in the real situation, such as student admissions, taking course materials, syllabus, assignments, students grades, class discussions through web, and doing online quizzes. Students could also join collaboration works by giving opinions, feedback and student produced paper/web which can be shared to the entire learning community. Therefore, it will build a collaborative learning environment where lectures together with students make constructive knowledge databases for entire learning community. This system has been developed based on Active Server Pages (ASP) technology from Microsoft which is embedded in a web server. Web pages reside in a web server which is connected to an SQL Database Server. Database server is used to store structured data such as lectures/students personal information, course lists, syllabus and its descriptions, announcement texts from lecturers, commentaries for discussion forum, student’s study evaluations, scores for each assignment, quizzes for each course, assignments text from lectures, assignments which are collected by students and students contribution/materials. This system has been maintained by an administrator for maintaining and developing web pages using HTML. The administrator also does ASP scripts programming to convert web pages into active server pages. Lectures and students could contribute some course materials and share their ideas through their web browser. This web-based collaborative learning system gives the students more active role in the information gathering and learning process, making the distance students feel part of a learning community, therefore increasing motivation, comprehension and interaction with other students.Nowadays, most of the information is still in printed format. To reproduce it in the electronic form, we need an efficient way to save the scanned document. For this purpose, AT & T Labs has been developing a new technology called DjVu. In this paper, we try to compare DjVu and JPG format. The goal is to decide whether DjVu is better or not. To achieve the goal, we try to scan the document and save it in DjVu and JPG format, make comparison between these two based on file size and image quality. Comparison is done for three types of document, such as b/w photo, document with text, and document in colour. The conclusion is, DjVu format is better than JPG in file size and quite good in image quality. So, DjVu have a chance to become a new standart.

The sensitivity of galvanic skin response for assessing mental workload in indonesia.

BACKGROUND Objective measures have been shown to be equally sensitive in different cultures. However, these measures need special devices that are relatively expensive and need expertise to analyze the result. In Indonesia, there is a need for a sensitive and affordable mental workload measure. OBJECTIVE To evaluate the sensitivity of Galvanic Skin Response (GSR) in assessing mental workload in Indonesia. PARTICIPANTS A total of 72 Indonesian students with normal visual capability. METHOD Participants were asked to work on visual memory search task with a secondary task of counting with three different levels of difficulty. GSR, Heart Rate Variability (HRV), and the NASA-TLX were administered prior to, during, and after the tasks. RESULTS GSR measure was compared to NASA-TLX and HRV measures. Like the HRV, GSR showed to be sensitive in distinguishing rest and task condition significantly but not sensitive in distinguishing different levels of mental workload. In contrast, both the NASA-TLX and performance measure were sensitive in differentiating different levels of mental workload. CONCLUSIONS GSR has potential as a simple, cost-effective tool for measuring mental workload in Indonesia.

Lumbar and seat cushions reduce whole-body vibration exposures in car driving

Whole-body vibration (WBV) has been associated with risk factors of low back pain among exposed drivers. The present study examined the efficacy of the use of lumbar cushion and seat cushion in reducing exposure to WBV. A total of 24 male participants completed 24 experimental sessions, a combination of two levels of rotational amplitude, three levels of rotational frequency and four levels of seating conditions. In each session, they were exposed to a five-minute vibration stimulus. The main and interaction effects of rotational amplitude, rotational frequency, and seating condition were significant (p < 0.01). The use of lumbar cushion and seat cushion reduced WBV exposure up to 12%, and the decline was more substantial at higher rotational frequency (i.e., higher speed) and higher rotational amplitude (i.e., rougher road condition). Lumbar and seat cushions can be used to improve driving health aspect in occupational setting.

Oculomotor response in measuring driving fatigue

Fatigue is a major factor that affects road safety. In Indonesia, the number of accidents seems to increase every year. Unfortunately, research that focuses on fatigue while driving is still limited. This study focuses on discussing oculomotor responses in measuring fatigue associated with driving. Experimental design used in this research, consisted of various factors of fatigue based on literature, and measured several indicators of oculomotor response. The experimental design in this research was modeled according to the real working condition of commercial drivers in Indonesia, with fairly long working hours (15-16 hours/day). The benefit of this study is to develop a valid method for detecting fatigue based on oculomotor response. It is expected that the finding can help to minimize the level of accident in Indonesia. In conclusion, there is still disagreement from literature on good oculomotor response for measuring fatigue, which warrants further investigations such as the present study.