Lower Limb Kinematic Coordination during the Running Motion of Stroke Patient: A Single Case Study

The purpose of this study was to clarify the lower limb joint motor coordination of para-athletes during running motion from frequency characteristics and to propose this as a method for evaluating their performance. The subject used was a 43-year-old male para-athlete who had suffered a left cerebral infarction. Using a three-dimensional motion analysis system, the angles of the hip, knee, and ankle joints were measured during 1 min of running at a speed of 8 km/h on a treadmill. Nine inter- and intra-limb joint angle pairs were analyzed by coherence and phase analyses. The main characteristic of the stroke patient was that there were joint pairs with absent or increased coherence peaks in the high-frequency band above 4 Hz that were not found in healthy subjects. Interestingly, these features were also observed on the non-paralyzed side. Furthermore, a phase analysis showed different phase differences between the joint motions of the stroke patient and healthy subjects in some joint pairs. Thus, we concluded there was a widespread functional impairment of joint motion in the stroke patient that has not been revealed by conventional methods. The coherence analysis of joint motion may be useful for identifying joint motion problems in para-athletes.

ANALISIS TINGKAT BERPIKIR DALAM MENYELESAIKAN SOAL GERAK PARABOLA MENGGUNAKAN TAKSONOMI STRUCTURE OF THE OBSERVED LEARNING OUTCOMES (SOLO) SISWA KELAS X MIA SMAN 1 SUNGAI RAYA

This This study aims to describe the level of students’ thinking profilein solving parabolic motion problems based on the SOLO taxonomy seen from learning outcomes and gender. This is a survey research without a comparison group. Data collection was done by giving 4 questions to 95class X MIA students at SMAN 1 Sungai Raya, and categorized based on learning outcomes (high, medium, low) and gender (male, female). The level ofstudents’ thinking profile in solving parabolic motion problems based on SOLO taxonomyis 50.52% at the pre-structural level, 11.57% at the uni-structural level, 21.05% at the multi-structural level, 16.84% at relational level , and0% at extended-abstract level. Additionally, students with high learning outcomes reached the uni-structural-relational thinking level, while moderate ones reached the uni-structural-multi-structural level, and low ones reached the uni-structural-pre-structural level. In terms of gender,female students' average percentage of thinking level is 44.2% higher than male students with only 33.6% of the ideal score.Keywords: Thinking Level, SOLO Taxonomy, Parabolic Motion.

LONG-WAVE MITIGATION STUDY FOR THE PORT OF NGQURA

Solutions to the long-wave induced moored ship motion problems at the Port of Ngqura were investigated in this study. Long-wave mitigation options were modelled with various layout modifications to the present model of the port, which has been validated with measured data. The numerical model simulations were used to derive long-term data sets inside the Port. Several moored ship motion simulations, using alternative conventional and dynamic mooring options, were performed for an extreme wave and wind condition for each berth at the port. Preferred port layout options and optimal mooring solutions were then determined for each berth. A complete framework of wave and ship motion simulations were performed for the preferred mitigation options. The ship motions and mooring line forces were determined for the relevant vessels at selected berths. This allowed for berth operability and downtime statistics to be determined, taking the limiting wave height and allowable mooring line criteria into account. Since several port layout options and different mooring arrangements were assessed, a Multi-Criteria-Analysis (MCA) was followed to determine the best possible solution.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/y79b158riGE

ANALISIS DESKRIPTIF BERBASIS MODEL MENTAL FISIKA TERHADAP PEMAHAMAN KOGNITIF MAHASISWA PADA KONSEP KINEMATIKA PARTIKEL DAN GERAK PARABOLA

ABSTRAK Artikel ini menguraikan hasil analisis deskriptif berbasis model mental fisika terhadap pemahaman kognitif mahasiswa semester pertama tahun ajaran 2019/2020 prodi pendidikan fisika JPMIPA FKIP UNIB Universitas Bengkulu pada konsep kinematika partikel dan gerak parabola. Data yang dianalisis diperoleh dari hasil pretest, lembar kerja mahasiswa (LKM), dan data hasil posttest dari mahasiswa yang berjumlah 28 orang mengikuti kuliah fisika dasar 1. Skor rata-rata data hasil Pretest adalah 44,64 pada rentang nilai yang cukup lebar yaitu 30-80. Skor rata-rata pada data hasil Posttest adalah 71,42 dengan rentang 50-100. Skor rata-rata pada posttest mengalami peningkatan sebesar 26,78 atau 60% terhadap skor rerata Pretest. Hasil analisis deskriptif pada data hasil pretest dan LKM menunjukkan rendahnya penguasaan mahasiswa dalam memahami soal-soal bentuk diagram gambar fisika dan grafik fisika. Tetapi mahasiswa tidak mengalami kesulitan dalam menerapkan rumus-rumus untuk menjawab soal-soal konsep GLB. meskipun ada sejumlah mahasiswa salah menentukan besarnya percepatan pada soal GLBB. Dari analisis pada posttest menunjukkan adanya peningkatan kompetensi kognitif pada mahasiswa. Mahasiswa telah mampu menerapkan model mental fisika dalam memahami dan memecahkan soal-soal berbentuk konseptual, diagram, grafik, dan penerapan rumus fisika pada materi kinematika partikel, dan konsep gerak parabola. Kata kunci: model mental, kompetensi kognitif, kinematika partikel dan gerak parabola ABSTRACT This article portrays a deskriptif analysis results based on physics mental model toward cognitif reasoning of the first semester in the year of study 2019/2020 students in physics education study program of the JPMIPA FKIP Bengkulu University on the concepts of kinematics particle and parabolic motion. The analized data were a pretestt, students work sheets (SWS) and posttest data Of 28 students who participated in basics physics 1 class. The mean score of the pretestt data was 44,64 in a range score of 30.00-80.00. The mean score of the posttest data was 71,42 in a range score of 50.00-100.00. The mean score of posttest increased about 60% compare with the mean score of pretestt. The deskriptif analysis on the pretestt data and the SWS data indicated that a low kognitif competency among the students in understanding physics diagram and solving physics graphs related problems. But no student faund any dificulty in using physics equations on solving the uniform motion problems. Eventhough some students failed in solving the amount of acceleration related problems. The analysed results of the posttest data indicated an improvement on students kognitif competency. Most of the students could apply the physics mental model on solving the conceptual, diagram, graph, and matematics related physics problems. Keywords: mental model, kognitif competency, arithmatics particle, and parabolics motion.

The Parameterized Complexity of Motion Planning for Snake-Like Robots

We study a motion-planning problem inspired by the game Snake that models scenarios like the transportation of linked wagons towed by a locomotor to the movement of a group of agents that travel in an ``ant-like'' fashion. Given a ``snake-like'' robot with initial and final positions in an environment modeled by a graph, our goal is to decide whether the robot can reach the final position from the initial position without intersecting itself. Already on grid graphs, this problem is PSPACE-complete [Biasi and Ophelders, 2018]. Nevertheless, we prove that even on general graphs, it is solvable in time k^{O(k)}|I|^{O(1)} where k is the size of the robot, and |I| is the input size. Towards this, we give a novel application of color-coding to sparsify the configuration graph of the problem. We also show that the problem is unlikely to have a polynomial kernel even on grid graphs, but it admits a treewidth-reduction procedure. To the best of our knowledge, the study of the parameterized complexity of motion problems has been~largely~neglected, thus our work is pioneering in this regard.