Judul: Studi Gerak, Pemeliharaan Tempat Kerja dan Waktu Baku Bagian Pengupasan Ubi di PT Galih Estetika Indonesia
Abstrak: Penelitian dilakukan di PT Galih Estetika Indonesia yang merupakan perusahaan yang menghasilkan pasta ubi. Tujuan penelitian menganalisis studi gerak, pemeliharaan tempat kerja, dan mengukur waktu baku pada bagian pengupasan ubi membandingkan mengupas ubi menggunakan pisau kecil dengan mengupas ubi menggunakan pisau besar. Gerakan pengupasan ubi sudah baik, karena gerakan yang dilakukan merupakan gerakan dasar yang berhubungan dengan pekerjaan. Analisis pemeliharaan tempat kerja menggunakan penerapan Seiri, Seiton, Seiso, Seiketsu, Shitsuke (5S) bagian pengupasan ubi perlu ditingkatkan, karena pekerja belum memiliki rasa disiplin diri dan lingkungan. Hasil dari pengukuran waktu pengupasan ubi menggunakan pisau kecil selama 49.11 detik dan pisau besar selama 20.14 detik. Ketika pekerja mengupas ubi menggunakan pisau besar hasil yang didapat 2 219.4 kg sedangkan menggunakan pisau kecil hasil yang didapatkan 2 421.8 kg sehingga target ubi yang dikupas semula 2 000 kg menjadi 3 000 kg kurang 19.27% untuk mencapainya.
Keyword: pemeliharaan tempat kerja, studi gerak, waktu baku

Judul: Perancangan Tata Kerja Bagian Kupas-Periksa pada Proses Pengolahan Ubi Jalar di PT Galih Estetika Indonesia.
Abstrak: The objective of the research were to examine the workload for several age levels of workers, to observe the tools and equipments utilization effect to fatigue, and also to recommend an optimal work system that related with tools/equipment utilization and work scheduling through ergonomic approach of sweet potato processing. The subjects employed in this research were 12 employees that divided based on age level into young, middle, and old age. The results of this research showed that the highest energy consumption when doing a work is on subject in old age group. Therefore, the morning shift is preferable to be taken by the old age workers with assistance from young and middle age workers, whereas afternoon and night shift were preferable for middle and young age. The highest productivity was coming from the middle age group that was constant in every work shift. The questionnaire results indicated that the workload of subjects on medium workload category, but in case of working equipment, subjects were situated in very uncomfortable category for using working tools and equipment, so the repairments based on anthropometric dimensions are required in order to fit the workers to the task.
Keyword: sweet potato processing, workload, work system design, work tools/equipment

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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