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Concrete structures are subjected to crack formation over time. The causes of crack formation are shrinkage, thermal stress, weathering, etc. This paper is about the construction and application of a device that uses image processing to detect cracks. The system is carried by a drone and can be remotely accessed. The system has a graphical user interface for initializing the device, viewing real time video, taking pictures of a crack, measuring its width, and evaluating if safe or unsafe. The pictures and their results are stored for reference.

This research aimed to describe the types of grammatical collocation errors produced by English learners in their writings. The writers used a qualitative method for collecting and analyzing the data. The data were taken from first-year students’ essays. Collocations from fifteen essays were collected and analyzed. As the standard for the collocations being analyzed, The Oxford Collocation Dictionary and The BBI Combinatory Dictionary of English were used by the writers. The results showed that the students made grammatical collocation errors in their writings, with a total of 35 grammatical collocations. It was also found that verb-noun collocation is the most dominant error made, which indicated that the students faced difficulties in using proper verbs in collocations.Keywords: Collocation error, grammatical collocation, students’ writings

This article is about gerund and to infinitive usages made by students in their argumentative essays. The research identified grammatical problems occurred in argumentative essays. The theories of Dulay about errors and Harmer about grammar were used. The writers used taxonomies in classifying errors into four types which are omission, addition, misformation and misordering. The method used was library research. In collecting the data, the researchers used students’ papers taken from two classes of a university. The writers concluded that the most common problem in using gerund and to infinitive is misformation. Students found it difficult to use gerunds and to infinitives. It also showed that practice is needed to solve the grammatical problems faced by the students.