3 research outputs found
Desain Multipurpose Landing Craft Tank Menggunakan Metode Optimisasi Global dan Lokal
No full textMultipurpose LCT (Landing Craft Tank) dikenal sangat efisien untuk pengangkutan alat berat, pekerjaan pertambangan dan proyek konstruksi. Keberadaaan multipurpose LCT diharapkan mampu membantu perkembangan daerah terpencil di Indonesia, salah satunya kabupaten Kepulauan Mentawai. Metode optimasi sangat tepat untuk menyelesaikan persoalan desain kapal yang kompleks. Pemodelan optimisasi yang akan digunakan adalah gabungan dari optimisasi global dan lokal. Metode optimisasi global dan lokal ini dinilai mampu menentukan nilai ukuran utama kapal yang optimum. Pada global optimization, nilai yang didapatkan bersifat umum atau global sehingga hasil yang didapatkan kurang mampu mencapai nilai optima. Oleh karena itu digunakan optimasi lokal untuk mengatasi kelemahan tersebut. Optimasi global menggunakan metode Artificial Neural Network (ANN) dan optimisasi lokal menggunakan metode Generalized Reduced Gradient (GRG). Optimasi dilakukan dengan pembuatan program add-ins pada Microsoft Excel menggunakan Visual Basic For Application (VBA). Fungsi objektif yaitu meminimumkan biaya pembangunan kapal. Dari hasil optimisasi global didapatkan 7 kombinasi ukuran utama dari 10000 kombinasi ukuran utama yang memenuhi batasan optimasi. Perbandingan antara fungsi objektif terminimum optimasi global dengan optimasi global dan lokal yang memenuhi seluruh batasan optimisasi adalah 4.19%. Perbandingan antara nilai fungsi objektif maksimum dan minimum pada optimasi global adalah 7%, sedangkan perbandingan antara nilai fungsi objektif maksimum dan minimum pada gabungan optimasi global dan lokal adalah 10%. Hasil optimisasi gabungan metode global dan lokal menghasilkan fungsi objektif yang lebih optimum. ========== viii
DES
IGN
OF
MULTIPURPOSE LANDING CRAFT TANK (LCT) USING
GLOBAL AND LOCAL OPTIMIZATION
Author
:
Varisha Vada Zumar
Student Number
:
4114100
0
79
Department / Faculty
:
Teknik Perkapalan / Teknologi Kelautan
Supervisor
:
Hasanudin, S.T., M.T.
ABSTRACT
Multipurpo
se
landing craft tank (
LCT
)
is known as very efficient for heavy equipment
transport, mining work and construction projects.
The exist of multipurpose LCT was expected
to help develop in remote areas in Indonesia,
such as
Mentawai Islands
regency
.
The
opti
mization method is perfect for resolving complex ship design issues. Optimization
modeling that used is combine of global and local optimization. This global and local
optimization method was capable of determining the
optimum ship main dimension.
Global
o
ptimization, the value obtained is general or global so that the results obtained less able to
reach the value of optima. Therefore, local optimization used to overcome these weaknesses.
Global optimization uses
Artificial Neural Network
(ANN)
methods and
local optimization
using the
Generalized Reduced Gradient
(GRG)
method
s
. The optimization is working by
creating an add
-
in program in Microsoft Excel using visual basic for application (VBA). The
objective function is to minimize the cost of ship building.
From the results of global
optimization obtained 10 main size combinations of 10000 combinations of key sizes that meet
the limits of optimization. The comparison between the minimum global optimization value
with global and local optimization is 5.14%. T
he ratio between the maximum and minimum
objective function values
for global optimization is 5%, while the comparison between the
maximum and minimum objective function values
on the combined global and local
optimization is 7%. The combined optimizat
ion results of global and local methods produce
more optimum objective functions
Use of a dual-purpose implant scan body to obtain both digital and analog records for complete arch fixed implant restorations
No full textA technique is described for capturing relative dental implant positions for an implant-supported fixed prosthesis in a completely edentulous arch with a novel implant indexing apparatus that also functions as a scannable verification device. A series of intraoral scans are made to record the contours and occlusal records of the existing prosthetics and soft tissue. The individual scans are aligned by using a dental software program to design either an interim or definitive prosthesis. The technique reduces the time needed to gather the records dental laboratory technicians require to fabricate a complete arch implant-supported prosthesis
Women speaker representation at SAGES annual meetings: a cross-sectional analysis
No full textBackground Gender representation trends at the Society of American Gastrointestinal and Endoscopic Surgeons (SAGES) Annual Meetings and the effect of the 2018 ‘We R SAGES’ initiatives are unknown. We assessed gender trends in oral presentations at the SAGES Annual Meeting between 2012 and 2022 with a focus on assessing the impact of the 2018 initiatives. Methods Abstracts selected for oral presentations from 2012 to 2022 were reviewed for presenter and first, second, and senior author gender. Gender was categorized as woman, man, or unknown using public professional profiles. Subsequent publications were identified using search engines. The primary outcome was the temporal trend of proportion of women in each role using interrupted time series analysis. Secondary outcomes included publication rates based on first and senior author genders in 2012–2018 versus 2019–2022. Results 1605 abstracts were reviewed. The proportion of women increased linearly in all categories: presenter (2.4%/year, R2 = 0.91), first author (2.4%/year, R2 = 0.90), senior author (2%/year, R2 = 0.65), and overall (2.2%, R2 = 0.91), (p < 0.01 for all). Prior to 2018, the proportion of women increased annually for presenters (coefficient: 0.026, 95% CI [0.016, 0.037], p = 0.002) and first authors (coefficient: 0.026, 95% CI [0.016, 0.037], p = 0.002), but there was no significant increase after 2018 (p > 0.05). Female second author proportion increased annually prior to 2018 (coefficient: 0.012, 95% CI [0.003, 0.021], p = 0.042) and increased by 0.139 (95% CI [0.070, 0.208], p = 0.006) in 2018. Annual female senior author proportion did not significantly change after 2018 (p > 0.05). 1198 (75.2%) abstracts led to publications. Women were as likely as men to be first (79% vs 77%, p = 0.284) or senior author (79% vs 77%, p = 0.702) in abstracts culminating in publications. There was no difference in woman first author publication rate before and after 2018 (80% vs 79%, p = 1.000), but woman senior author publication rate increased after 2018 (71% vs 83%, p = 0.032). Conclusion There was an upward trend in women surgeons’ presentations and associated publications in the SAGES Annual Meetings over the last decade
