On cognitive tensionsm.

Aim. The foundation of symbolization is a substitution: a mediation between a Representamen and Object. The paper leverages this core mechanic to examine the substitutions within the conscious and unconscious parts of the mind, which compose every act of thinking. Recognizing it is a single instance: the Ego, which regulates this parallel mediation, the paper focuses on the exploration of dichotomies that result from the necessity to perform two symbolizations simultaneously. Concepts. The study’s theoretical framework is determined by Charles S. Peirce’s (1998) concept of sign and Melanie Klein’s (1948) psychoanalytic theory. From semiotic and psychoanalytic angles, this paper explores possible comprehensions of the object in the quasi-mind (Interpretant in infinite semiosis) and actual realization of code in the act of individual thinking (Ego mediating between conscious and unconscious symbolization). Results and conclusion. The main result of the study is the exposure of dichotomies that structure the shared ground for the conscious and the unconscious symbolization. This, in turn, highlights tangible constraints that the mind is subjected to in the act of thinking. Cognitive value. The study’s main contribution is the high-level scheme of dynamics that hold the Ego in reality through the means of unconscious and conscious symbolization. The study also incorporates into coherent model unexamined aspects of individual sign usage: it deploys psychic continuity into the conscious symbolization process (by basing the model on the instance of Ego), which allows addressing the issues arising at the border of conscious and unconscious symbolization.

Complexity Evaluation of an Environmental Control and Life-Support System Based on Directed and Undirected Structural Entropy Methods

During manned space missions, an environmental control and life-support system (ECLSS) is employed to meet the life-supporting requirements of astronauts. The ECLSS is a type of hierarchical system, with subsystem—component—single machines, forming a complex structure. Therefore, system-level conceptual designing and performance evaluation of the ECLSS must be conducted. This study reports the top-level scheme of ECLSS, including the subsystems of atmosphere revitalization, water management, and waste management. We propose two schemes based on the design criteria of improving closure and reducing power consumption. In this study, we use the structural entropy method (SEM) to calculate the system order degree to quantitatively evaluate the ECLSS complexity at the top level. The complexity of the system evaluated by directed SEM and undirected SEM presents different rules. The results show that the change in the system structure caused by the replacement of some single technologies will not have great impact on the overall system complexity. The top-level scheme design and complexity evaluation presented in this study may provide technical support for the development of ECLSS in future manned spaceflights.

Statistical Mechanics and Thermodynamics: Boltzmann’s versus Planck’s State Definitions and Counting

During the physical foundation of his radiation formula in his December 1900 talk and subsequent 1901 article, Planck refers to Boltzmann’s 1877 combinatorial-probabilistic treatment and obtains his quantum distribution function, while Boltzmann did not. For this, Boltzmann’s memoirs are usually ascribed to classical statistical mechanics. Agreeing with Bach, it is shown that Boltzmann’s 1868 and 1877 calculations can lead to a Planckian distribution function, where those of 1868 are even closer to Planck than that of 1877. Boltzmann’s and Planck’s calculations are compared based on Bach’s three-level scheme ‘configuration–occupation–occupancy’. Special attention is paid to the concepts of interchangeability and the indistinguishability of particles and states. In contrast to Bach, the level of exposition is most elementary. I hope to make Boltzmann’s work better known in English and to remove misunderstandings in the literature.

Efficient and Scalable Initialization of Partitioned Coupled Simulations with preCICE

preCICE is an open-source library, that provides comprehensive functionality to couple independent parallelized solver codes to establish a partitioned multi-physics multi-code simulation environment. For data communication between the respective executables at runtime, it implements a peer-to-peer concept, which renders the computational cost of the coupling per time step negligible compared to the typical run time of the coupled codes. To initialize the peer-to-peer coupling, the mesh partitions of the respective solvers need to be compared to determine the point-to-point communication channels between the processes of both codes. This initialization effort can become a limiting factor, if we either reach memory limits or if we have to re-initialize communication relations in every time step. In this contribution, we remove two remaining bottlenecks: (i) We base the neighborhood search between mesh entities of two solvers on a tree data structure to avoid quadratic complexity, and (ii) we replace the sequential gather-scatter comparison of both mesh partitions by a two-level approach that first compares bounding boxes around mesh partitions in a sequential manner, subsequently establishes pairwise communication between processes of the two solvers, and finally compares mesh partitions between connected processes in parallel. We show, that the two-level initialization method is fives times faster than the old one-level scheme on 24,567 CPU-cores using a mesh with 628,898 vertices. In addition, the two-level scheme is able to handle much larger computational meshes, since the central mesh communication of the one-level scheme is replaced with a fully point-to-point mesh communication scheme.