Sisuljak 2003.

Stručna praks

Optech LiDAR

U ovom članku je dan opći pregled Optechove tehnologije laserskog skeniranja podijeljene na terestrički, zračni i svemirski dio. Prikazan je i reprezentativan proces obrade sirovih podataka iz terestričkog laserskog skenera, kao i nova dostignuća u ovoj tehnologiji

USING 3D LASER SCANNERS ON ARCHAEOLOGICAL SITES

In order to fully understand and interpret an archaeological site, it must be recorded and documented in detail. There are two types of archaeological documentation – the, so-called, direct surveys which usually include a pencil, piece of paper and a tape measure, and the second type which includes indirect techniques like total stations, 3D optical instruments, drones or a simple camera. More time to collect data is required when applying the first approach, meaning that more people are a prerequisite for speeding up the process, which leads to “not fully precise” and subjective data acquisition. On the other hand, indirect techniques, like 3D laser scanning discussed in this paper, are less time consuming and provide more accurate documentation. 3D scanning may also improve object accessibility, can aid expert understanding, and enhance relations with the general public

Razvoj alata za obradu i prilagodbu podataka pri izradi preciznog forenzičnog 3D modela

Prošlo je nekoliko godina od najveće vatrogasne tragedije u povijesti Hrvatske, tragedije u kojoj je život izgubilo 12 vatrogasaca. Taj je nesretni događaj objedinio velik broj stručnjaka iz najrazličitijih znanstvenih disciplina čiji je cilj bio rekonstrukcija događaja i otkrivanje istine te objašnjenje vatrenog fenomena koji je naglo iznenadio i opkolio vatrogasce na Velikom Kornatu. Za potrebe forenzične analize i izrade adekvatnog 3D modela korištene su najnovije tehnologije i metode prikupljanja i obrade prostornih podataka – članak opisuje korištene tehnologije uz naglasak na obradu i prilagodbu podataka koja je prethodila izradi 3D simulacijskog modela – za tu namjenu je razvijen autorski program Rasterizer koji se posebno opisuje u ovom članku. Konačan je 3D model predstavljao jedan od ključnih elemenata u daljnjem znanstvenom i praktičnom proučavanju požara

Exercise-Induced Fatigue Impairs Change of Direction Performance and Serve Precision among Young Male Tennis Players

This study investigates the effect of exercise-induced fatigue on change of direction performance and serve precision among young tennis players. A group of 21 players (age 12.90 ± 0.76 years), ranked among the top 50 players on the national tennis federation scale and the top 300 on the “Tennis Europe” scale, participated in the study. They underwent a standardized physiological load protocol using the “300-m running test” which consists of consecutive runs for 15 shares of 20 m (15 × 20). Its intensity was determined using the Borg Rating of Perceived Exertion (RPE) scale where subjects evaluated their level of experienced load on a scale from 0 to 10. Prior to and after the protocol, they performed a pre-planned change of direction T-test and serve precision test. Results showed significant increase of time in the T-test (from 11.75 ± 0.45 s to 12.99 ± 0.4 s, p = 0.00) and decrease in serve precision parameter from (6.00 ± 1.04 to 4.00 ± 1.26, p = 0.00) after the fatigue test protocol. The RPE increased from 5 to 9, after the fatigue protocol, indicating the desired fatigue effect. These findings indicate that exercise-induced fatigue impairs change of direction performance and serve precision among young tennis players