scholarly journals A Study on Multi-Objective Parametric Design Tool for Surround-Type Movable Shading Device

2019 ◽  
Vol 11 (24) ◽  
pp. 7096
Author(s):  
Ho-Jeong Kim ◽  
Chang-Seok Yang ◽  
Hyeun Jun Moon
Keyword(s):  
Solar Radiation ◽  
Parametric Design ◽  
Design Tool ◽  
Direct Solar Radiation ◽  
The South ◽  
Winter Solstice ◽  
Performance Simulation ◽  
Multi Objective ◽  
The One ◽  
Shading Device

This study presents a multi-objective parametric design tool for four-axis surround-type movable shading device using solar position tracking in Seoul, South Korea. In order to explore large numbers of possible forms of shades, generic algorithms are utilized with real-time simulation of the performative criteria such as solar radiation, daylight glare probability (DGP), and solar shielding rate on window surface. This study outlines a workflow using a multi-objective engine called Octopus that runs within Grasshopper 3D, a parametric design tool, in addition to environmental performance simulation plug-in Ladybug. The workflow utilizes a performance-based design tool, which allows the designer to explore, sort, and filter solutions, and visually compare alternative solutions in terms of energy saving and indoor daylight quality in order to determine the optimal form of shade changing its shape every one hour. The result of deriving and analyzing the optimal shade shape through the genetic algorithm proposed in this study is as follows: On the one hand, on the summer solstice, shade shapes with shielding areas of almost 100% should be derived to achieve the most effective reduction of the direct solar radiation. The proposed movable shading device reduced direct solar radiation by 52.40% and 57.20% in the south- and east-facing windows, respectively. On the other hand, in winter when solar heat gain is important, the absence of sunshade is optimal in terms of heating load. However, in order to improve the indoor light environment, it is confirmed that it is possible to derive a certain shape of sunshade according to the sun’s trajectory. On the winter solstice, the problem of glare arises from 10:00 to 15:00 in the south and 10:00 in the east. Therefore, the proposed four-axis movable shading device can be configured to have a minimum protrusion length satisfying DGP less than 0.35 in winter.

Factors influencing generation times of spruce beetles in Alaska

1985 ◽  
Vol 15 (2) ◽  
pp. 438-443 ◽  
Author(s):  
Richard A. Werner ◽  
Edward H. Holsten
Keyword(s):  
Solar Radiation ◽  
Developmental Rate ◽  
Life Cycles ◽  
Direct Solar Radiation ◽  
Threshold Temperature ◽  
The South ◽  
The North ◽  
Generation Times ◽  
Standing Trees ◽  
One Year

Direct solar radiation to the bark surface of white spruce, Piceaglauca (Moench) Voss, is the primary environmental factor influencing the developmental rate of spruce beetles, Dendroctonusrufipennis (Kirby), in Alaska. A phloem threshold temperature of 16.5 °C is required to initiate the development of 1 year life cycle beetles. Tree location within a stand and stand aspect in relation to direct solar radiation determine which trees or areas of the tree support beetles with 1- and 2-year life cycles. Two-year cycles normally developed on the north and west sides of standing trees and the north and bottom sides of felled trees, which were characterized by an average phloem temperature of 10.6 °C. One-year cycles normally developed on the south sides of standing trees and the south and top sides of felled trees, which were characterized by an average phloem temperature of 16.5 °C.

scholarly journals ¿Atrapando el Solsticio? Un análisis crítico de la orientación de los templos de Deir el-Bahari

2019 ◽  
pp. 11-26
Author(s):  
Juan Antonio Belmonte Avilés ◽  
◽  
Magdi Fekri ◽  
Miquel Serra ◽  
◽  
...  
Keyword(s):  
Ancient Egypt ◽  
The Other ◽  
The South ◽  
Winter Solstice ◽  
New Approaches ◽  
Other Hand ◽  
The Family ◽  
Alternative Hypotheses ◽  
The One ◽  
The Temple

The temples of Deir el-Bahari were studied in earlier campaigns carried out during the last decade within the framework of the Archaeoastronomy Mission of Ancient Egypt; in particular those of Mentuhotep II and Hatshepsut. Although they seem to belong to the family of temples oriented to the rising sun at the winter solstice, this orientation was not as precise as would be expected for temples of such importance. Therefore, after resuming work in Egypt, it was decided to propose alternative hypotheses that could explain the deviations of these two temples to the south and north of the solsticial line, respectively. It is difficult to imagine that they were mere design errors. In December 2017, further fieldwork was carried out in Thebes, in particular at Deir el-Bahari, and observations and measures were made on site during the winter solstice itself, documenting this phenomenon. The verifications carried out seem to confirm some new approaches. On the one hand, the memorial temple of Mentuhotep II could be diverted c. 2º to the south so that there would be a lighting effect during the winter solstice in the chapel closing the complex at the base of the cliff. This would be an astronomical event that could be related to the Wepet Renpet (New Year) at that period (11th Dynasty). On the other hand, the Temple of Millions of Years of Hatshepsut could be oriented towards sunrise on another unique date of the civil calendar during the reign of this sovereign. All in all, astronomical orientations at the site could relate to key dates in the civil calendar at the time when the temples were built.

The Fable of the Writer in Southern Fiction

Prospects ◽  
1982 ◽  
Vol 7 ◽  
pp. 249-266
Author(s):  
Lewis P. Simpson
Keyword(s):  
The Other ◽  
Deep South ◽  
The South ◽  
Southern Fiction ◽  
Yoknapatawpha County ◽  
The One

No scene in Faulkner is more compelling than the one that transpires on a “long still hot weary dead September afternoon” in Yoknapatawpha County, Mississippi, toward the end of the first decade of this century. Quentin Compson sits with Miss Rosa Coldfield in a “dim airless room” still called “the office because her father called it that,” and listens to Miss Rosa tell her version of the story of the “demon” Sutpen and his plantation, Sutpen's Hundred. As she talks “in that grim haggard amazed voice”—“vanishing into and then out of the long intervals like a stream, a trickle running from patch to patch of dried sand”—the 22-year-old Mississippi youth discovers he is hearing not Miss Rosa but the voices of “two separate Quentins.” One voice is that of the “Quentin preparing for Harvard in the South, the deep South dead since 1865 and peopled with garrulous baffled ghosts.” The other voice is that of the Quentin “who was still too young to deserve yet to be a ghost, but nevertheless having to be one for all that, since he was born and bred in the deep South the same as she [Miss Rosa] was.” The two Quentins talk “to one another in the long silence of notpeople, in notlanguage: It seems that this demon—his name was Sutpen—(Colonel Sutpen)—Colonel Sutpen. Who came out of nowhere and without warning upon the land with a band of strange niggers and built a plantation”.

scholarly journals Multi-objective database queries in combined knapsack and set covering problem domains

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Sean A. Mochocki ◽  
Gary B. Lamont ◽  
Robert C. Leishman ◽  
Kyle J. Kauffman
Keyword(s):  
Relational Database ◽  
Set Covering ◽  
Covering Problem ◽  
Set Covering Problem ◽  
Database Queries ◽  
Multi Objective ◽  
Data Representations ◽  
Np Hard Problem ◽  
Institute Of Technology ◽  
The One

AbstractDatabase queries are one of the most important functions of a relational database. Users are interested in viewing a variety of data representations, and this may vary based on database purpose and the nature of the stored data. The Air Force Institute of Technology has approximately 100 data logs which will be converted to the standardized Scorpion Data Model format. A relational database is designed to house this data and its associated sensor and non-sensor metadata. Deterministic polynomial-time queries were used to test the performance of this schema against two other schemas, with databases of 100 and 1000 logs of repeated data and randomized metadata. Of these approaches, the one that had the best performance was chosen as AFIT’s database solution, and now more complex and useful queries need to be developed to enable filter research. To this end, consider the combined Multi-Objective Knapsack/Set Covering Database Query. Algorithms which address The Set Covering Problem or Knapsack Problem could be used individually to achieve useful results, but together they could offer additional power to a potential user. This paper explores the NP-Hard problem domain of the Multi-Objective KP/SCP, proposes Genetic and Hill Climber algorithms, implements these algorithms using Java, populates their data structures using SQL queries from two test databases, and finally compares how these algorithms perform.

The effects of US–China competing strategies in Asia-Pacific on India and Pakistan rivalry in the South Asian region

2021 ◽  
pp. 205789112110211
Author(s):  
Zafar Khan
Keyword(s):  
South Asian ◽  
Strategic Partnership ◽  
Grand Strategy ◽  
Asia Pacific ◽  
The South ◽  
Reduced Pressure ◽  
The Us ◽  
Belt And Road ◽  
Modernization Process ◽  
The One

This article primarily focuses on how the increasing US–China competing strategies in Asia-Pacific affect the policies of South Asian rivals India and Pakistan when, on the one hand, the US as part of its offshore balancing grand strategy has been increasing its strategic partnership with India through the transfer of emerging technologies in terms of military modernization process, and on the other hand, China and Pakistan have improved their geo-economic and geostrategic partnership as part of the Chinese grand strategy via the Belt and Road Initiative while enabling Pakistan to produce effective countermeasures against its potential adversary. The article presumes that, in doing so, such competing strategies frame a quadrangle setting comprising of US and India to deter and contain China on the one hand and China and Pakistan to produce countermeasures and try to create a balance to potentially prevent the risk of conflict in South Asia out of such competing strategies at the quadrangle order conceived here. However, in fact, neither the US nor rising China would desire such a possibility of conflict otherwise unintendedly occurring from the intense US–China competing strategies while affecting the policies of the South Asian rivals. The article concludes that the shaping of this quadrangle framework may bring both opportunities and challenges for the South Asian rivals. It also concludes that the more intense the competition between the US and China becomes, the more intense its implications could be on the South Asian rivals, while the reduced tension between China and the US, although unlikely, would have reduced pressure on India and Pakistan relations as well.

scholarly journals The role of L/W in the solar radiation for Saharian cities

2019 ◽  
Vol 91 ◽  
pp. 05006
Author(s):  
Rami Qaoud ◽  
Alkama Djamal
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Energy Levels ◽  
Direct Solar Radiation ◽  
Test Field ◽  
Natural Lighting ◽  
The Difference ◽  
The Impact ◽  
The Relationship

The urban fabric of the desert cities is based on the principle of reducing the impact of urban canyons on direct solar radiation. Here comes this research, which is based on a comparative study of the periods of direct solarisation and values of the solar energy of urban canyons via two urban fabrics that have different building densities, where the ratio between L/W is different. In order to obtain the real values of the solar energy (thermal, lighting), the test field was examined every two hours, each three consecutive days. The measurement stations are positioned by the three types of the relationship between L/W, (L≥2w, L=w, L≤0.5w). According to the results, we noticed and recorded the difference in the periods of direct solarization between the types of urban engineering canyons, reaching 6 hours a day, the difference in thermal values of air, reaching 4 °C, and the difference in periods of direct natural lighting, reaching 6 hours. It should be noted that the role of the relationship between L/W is to protect the urban canyons by reducing the impact of direct solar radiation on urban canyons, providing longer hours of shading, and reducing solar energy levels (thermal, lighting) at the urban canyons. This research is classified under the research axis (the studies of external spaces in the urban environment according to the bioclimatic approach and geographic approach). But this research aims to focus on the tracking and studying the distribution of the solar radiation - thermal radiation and lighting radiation - in different types of street canyons by comparing the study of the direct solarization periods of each type and the quantity of solar energy collected during the solarization periods.

Dynamic Modeling of Solar Radiation Disturbances Based on a Biomimetic Cloud Shading Model

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Jesús García ◽  
Iván Portnoy ◽  
Ricardo Vasquez Padilla ◽  
Marco E. Sanjuan
Keyword(s):  
Time Series ◽  
Solar Radiation ◽  
Control Strategies ◽  
Ground Level ◽  
Direct Solar Radiation ◽  
Complex Phenomenon ◽  
Two Dimensional ◽  
Multi Objective Optimization ◽  
Tuning Parameters ◽  
Radiation Time

Variation in direct solar radiation is one of the main disturbances that any solar system must handle to maintain efficiency at acceptable levels. As known, solar radiation profiles change due to earth's movements. Even though this change is not manipulable, its behavior is predictable. However, at ground level, direct solar radiation mainly varies due to the effect of clouds, which is a complex phenomenon not easily predictable. In this paper, dynamic solar radiation time series in a two-dimensional (2D) spatial domain are obtained using a biomimetic cloud-shading model. The model is tuned and compared against available measurement time series. The procedure uses an objective function based on statistical indexes that allow extracting the most important characteristics of an actual set of curves. Then, a multi-objective optimization algorithm finds the tuning parameters of the model that better fit data. The results showed that it is possible to obtain responses similar to real direct solar radiation transients using the biomimetic model, which is useful for other studies such as testing control strategies in solar thermal plants.

The Villa Item and a Bride's Ordeal

1929 ◽  
Vol 19 (1) ◽  
pp. 67-87 ◽  
Author(s):  
Jocelyn Toynbee
Keyword(s):  
The South ◽  
Important Paper ◽  
The North ◽  
Dwelling House ◽  
South Wall ◽  
The Subject ◽  
The One ◽  
The Individual ◽  
North Wall ◽  
The Right

The paintings in the triclinium of the Villa Item, a dwelling-house excavated in 1909 outside the Porta Ercolanese at Pompeii, have not only often been published and discussed by foreign scholars, but they have also formed the subject of an important paper in this Journal. The artistic qualities of the paintings have been ably set forth: it has been established beyond all doubt that the subject they depict is some form of Dionysiac initiation: and, of the detailed interpretations of the first seven of the individual scenes, those originally put forward by de Petra and accepted, modified or developed by Mrs. Tillyard appear, so far as they go, to be unquestionably on the right lines. A fresh study of the Villa Item frescoes would seem, however, to be justified by the fact that the majority of previous writers have confined their attention almost entirely to the first seven scenes—the three to the east of the entrance on the north wall (fig. 3), the three on the east wall and the one to the east of the window on the south wall, to which the last figure on the east wall, the winged figure with the whip, undoubtedly belongs.

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