Whole body vibration is vibration that propagates throughout the worker's body from vibration sources in the form of machines, vehicles, and so on. In this paper it is reported the results of research to determine the total value of vibration acceleration on several drivers of the public transport in Samarinda and to analyze the comfort level of the drivers receiving the vibration on their bodies. The components of the vibration acceleration were measured by using a vibration meter type of Svantex 106. The comfort level of the driver in receiving the vibration was assosiated with the scale of comfortable level set by the Ministry of Manpower of the Republic of Indonesia by decree number PER.13/MEN/X/2011. The research found that the average of the total value of vibration acceleration received by the drivers in A, B, and C transportations were 0.3877 m/s2 , 0.7056 m/s2 dan 0.6596 m/s2 , respectively. In Samarinda the drivers in B and C transportations were more uncomfortable to receive the whole body vibration than the drivers in C transportation.

Work climate is one of the factors whose gave big influence  on the performance of human resources, for both in hot work climate and cold work climate, even the effect is not limited to performance but can go further, specifically on the safety and health of workers. For this reason, it is necessary to measure and evaluate the working climate standard. This study was conducted to determine the effect of hot working climate on the physiological response of workers in the preparation room at PT-X and to find a temperature control strategy in the preparation room at PT-X. The research were carried out in 4 steps, namely: first was collecting data on the work climate in the Preparation Room at PT-X, second was collecting data on the workload of workers in the Preparation Room at PT-X, third was collecting data on the physiological response of the worker in the form of measuring body temperature, measuring blood pressure, measuring pulse rate and measuring the weight of workers.  The last step was analysis. Based on the results of the research, the hot working climate affects the physiological response of the workers before and after work. The strategy for controlling the hot working climate in the Preparation Room at PT-X is by increasing the rest time for workers, maximizing the use of PPE (Personal Protection Equipment) for each worker, and adding health signs at the worker's location.

The activity of lifting weights has many risks that can lead to complaints and work accidents such as mistakes in lifting excessive loads, overly bent postures, and other complaints that result in uncomfortable working conditions. This research was conducted to determine the risk level of work posture using the REBA method and biomechanics in lifting weights with different lifting variables. The research were took documentation data, angle and distance measurements by using the Kinovea application, and the data analyzed by using the REBA Assessment Worksheet and biomechanical equations. Based on the results obtained, the activity of lifting burdens on workers from the aspect of the REBA method mostly has a high level of risk category and only 1 worker has a moderate level of risk category. Meanwhile, from the biomechanics aspect, most of them have a risk level in the careful category, 1 worker has a risk level in the safe category, and 1 worker who has lifted a load of 50 kg has a risk level in the dangerous category.

Craniospinal is known as the method to kill the cancer within a wide radiation area, starting from the cranial to spinal nervous system. In the case, the cancer has spread through the fluid of cerebro spinalis, such as medulloblastoma. We carried out the research to determine the isodose curve in medulloblastoma craniospinal patients and DVH (Dose Volume Histogram) statistic in the OAR (Organ at Risk) by using 3D-CRT radiotherapy technique.  To conduct the radiative treatment, we used the moving Junction method in which the radiation was divided into three Iso section, i.e.: Section Iso brain with gantry 90° and 270°, Section Iso thoracic with gantry 0°, and Section Iso lumbar with gantry 0°. Then, we analyzed the isodose curves and DVH statistics created by photon beams of 6 MV and 10 MV with and without considering the dose absorbed by OAR. We found that the isodose curves created with considering the OAR dose were better than those created without considering the OAR dose. We also found that the dose absorbed by OAR was within the tolerance limit stated in ICRU guidelines.   Kata Kunci: DVH of statistic, Isodose curve, Craniospinal, Medulloblastoma

Knowing the condition of the waters is very important for the sustainability of aquatic ecosystems. The condition of the waters so as not to have a bad impact on aquatic ecosystems can be known through temperature and salinity parameters. Seawater temperature is the distribution of heat in the ocean caused by the movement of water and other factors. The salinity of seawater is the level of saltiness or the level of salt dissolved in seawater. Temperature can be measured using a thermometer and salinity is measured using a refractometer. However, using these tools requires time, effort, cost, and manual data retrieval processes. Therefore, this research aims to make a temperature and salinity measuring instrument and determine the relationship between Voltage and salinity in the seawater. This research used the method of measuring electrical conductivity (DHL) to determine a change in magnitude. The temperature and salinity design consisted of an Arduino Uno, a YL-38 Module, and copper as an electrode, and a DS18B20 Temperature Sensor. the result of this research shows that has been done, the average error presentation of salinity is 0.00732% and temperature is 0.044 %. Through this research, salinity and the temperature instrument produced using electrodes made of copper and DS18B20 which operate at a Voltage of 4,8 Volts. The obtained a linear graph between stress and salinity. The relationship between voltage and salinity is directly proportional, the higher the salinity of seawater, the greater the output voltage.