• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.6
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• pp.989-996
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• 2017

The proposed directional pencil beam antenna consists of a waveguide feeder with bended elliptical conductor plate feed and a parabolic curved reflector. Two rectangular apertures located at the broad wall near the end of the feed waveguide inserted from behind the reflector are located at the focus of the reflector and emit electromagnetic energy with bended elliptical conductor plate. This plate is designed to reflect electromagnetic energy primarily and to face the main reflector. The two rectangular apertures located at the waveguide end have inwardly protruding tabs for impedance matching of the antenna system, the shape of the tabs is a truncated oval. The proposed parabolic reflector antenna has a diameter of 400 mm and a focal length of 134.23 mm. The antenna gain is 33.68 dBi at the center frequency of 16.5 GHz, the beam width is $3.3^{\circ}$ and the reflection loss is -15 dB. Using the HFSS-IE, simulation results are performed to validate the proposed antennas.

• Korean Institute of Interior Design Journal
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• v.17 no.2
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• pp.75-82
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• 2008

Weeks who is an architect in England suggest that let us consider the hospital architecture as not determined architecture but an undetermined architecture. Because it has been changing unexpectedly. The changing process of hospital architecture is required that it has to involve the new function and be a role model because of variations of environmental factors. For silving the requirements above mentioned, hospital architecture takes the way of appropriateness inner origin form and finally it considers new formation. The 53% of hospital buildings in Korea were built in 1980s. For 30years, these buildings have been not only extended a buildings but also changed in parts of functions and sizes on buildings which are original. The purpose of this study is producing the basic references which suggest solution to face on the changing of hospital building during planning it in the future using by analysis of variation inside the hospital building and grasping of characters in each departments. Each department is analyzed as follows. There is no inner change but only expansion partly by enlargement of building. In the outpatient, there is not only expansion by enlargement of building and but also extension toward other parts and the rate of variation of inside is high. In the diagnostic treatment, there are differences in diagnostic treatment. Surgical suit and diagnostic imaging have been expanded by enlargement than the change of inside. But the others of the departments have been changed by change of inside and also there are sometimes changes of inner walls.

• Journal of the Korean Society of Costume
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• v.63 no.6
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• pp.113-126
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• 2013

The purpose of this study is to analyze the current use of mannequins that are designed to display Hanbok and put forward suggestions for improvement. In order to carry out the study, an analysis on the mannequins that are currently in the market was conducted along with a survey with professionals who are in charge of the display. The significance of the study is that it has gathered the opinions of professionals who are currently participating in the displays of Hanbok to lay the foundation for improvements. As Hanbok is a flat-pattern costume unlike the Western ones, the most prominent way to display is to lay them on the floor or hang them on the wall. Nevertheless, the mannequin displays are needed to show the beauty of Hanbok as the silhouette can only be completed when it is put on a body. A new type of mannequins that can portray the distinctive features of Korean beauty more effectively need to be developed. Although the museum and enterprise slightly differ in their preferences and requirements for the mannequins, both agree on the following criteria; the shape should be adjusted: the protruding breasts of the mannequin are not suitable for Hanbok, the body should be disassembled: all parts of the body should be separable and it should be flexible at the joints so that it can produce various poses, the face should represent the "koreaness" and the material should be soft. Based on these findings, we put forth the suggestion that a more suitable mannequin should be developed to portray the beauty of Hanbok.

• Journal of the Korean Society of Propulsion Engineers
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• v.11 no.5
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• pp.72-77
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• 2007

The combustion test results of the sub-scale combustor having dual swirl injector with internal mixing for a liquid rocket engine are described. The sub-scale combustor uses liquid oxygen(LOx) and kerosene as propellants and has an injector head, an ablative material combustor wall and a water cooled nozzle. The injector head has LOx manifold, fuel manifold, fire face plate, one center swirl injector and 18 main swirl injectors of internal mixing. The combustion tests were successfully performed at design and off-design points without any damages on the injectors. Combustion characteristics velocity of 1756m/s was measured at design point. High frequency combustion instability was not observed but low frequency pulsations occurred at off-design conditions.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.12 no.2
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• pp.92-95
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• 2016

Beckwith-Wiedemann syndrome comprises multiple congenital anomalies with a risk of development of childhood tumors. Macroglossia is the predominent finding in Beckwith-Wiedemann syndrome and other findings include postnatal somatic gigantism, abdominal wall defects, nevus flammeus of the face, congenital heart defects, and cleft palate. The aim of this case presentation is to describe the dental treatment of a child with Beckwith-Wiedemann syndrome. A 3-year-old boy with Beckwith-Wiedemann syndrome visited to the Seoul National University Dental Hospital for dental evaluation and treatment. Due to the multiple caries and poor cooperation, we planned to perform the dental procedure under general anesthesia. The dental procedure was successfully performed and there was no airway complications after extubation. This case suggests that general anesthesia may be useful for the patient with uncooperative Beckwith-Wiedemann syndrome, since macroglossia and laryngomalacia may exacerbates airway compromise during dental sedation.

• Solar Energy
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• v.19 no.4
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• pp.71-80
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• 1999

For developing a new measuring device which enables the thermal resistance at comers of the building envelope in addition to the plate wall measuring device, computer simulations were performed to clarify the problems produced during previous tests. For the optimum design to reduce the temperature deviation in measuring device, the specifications of the measuring devices are to be as follows : Dimension of the device is $500{\times}500{\times}100mm$ in size, heating plate is seperated to some degree from the inner surface of the measuring device, lower temperature of heating plate is as effective as possible, fans should be located at the upper part in the measuring device and face to downward.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1983.05a
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• pp.19.1-19
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• 1983

The dentigerous cyst involving maxilla is rare disease in Otolaryngologic field. A case of 22-year-old male patient involving dentigerous cyst of the maxilla with chronic inflammatory signs has been presented. The occurrence of odontogenic epithelium in the wall of dentigerous cyst is a well known entity. This epithelium usually remains inactive and does not have clinical significance, but these small inactive islands of epithelium may be stimulated, resulting in chronic inflammation, ameloblastoma and squamous cell carcinoma. Therefore correct diagnosis and proper treatment are very important. The authors have recently experienced a case of dentigerous cyst causing a mild disfigulation of face. The cyst was surgically enucleated through sublabial approach.

• Cross-Cultural Studies
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• v.31
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• pp.95-118
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• 2013

Robert Frost's poetry has generally been considered fairly readable partly because of the simplicity or down-to-earth-ness of the messages that go along with the poet's projected public image and the 'traditional' forms he used. Against the grain of such general perception, this study reads some of the early poems of Robert Frost to re-characterize the beginning of the poet's career as a modernist attempt to challenge the dominant poetic conventions of the time: the genteel conventions. In reading the poems, this study focuses on frost's strategic method of using the speaker or persona regarding the delivery of meanings. Those readers who would like to find the immediate presence of Frost's voice in the poems, fail to distinguish the speaker and the poet, readily accepting the face value of what the speaker tries to convey: those messages which are in line with liberal individualism, like self-reliance, autonomous self, work ethics, etc. Frost's speakers, however, are rarely the mouthpiece of the poet himself. Rather, they are fictional characters who, while on the surface of the text appear to be hammering out a stable theme out of their everyday experience, under a heuristic scrutiny of the textual structure, turn out to be undermining the logic or the rationality of the theme, which can be identified as a modernist textual strategy that challenges the traditional conventions regarding the stability of meaning in a poetic text.

• The Journal of Advanced Prosthodontics
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• v.15 no.1
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• pp.1-10
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• 2023

PURPOSE. Accuracy of image matching between resting and smiling facial models is affected by the stability of the reference surfaces. This study aimed to investigate the morphometric variations in subdivided facial units during resting, posed and spontaneous smiling. MATERIALS AND METHODS. The posed and spontaneous smiling faces of 33 adults were digitized and registered to the resting faces. The morphological changes of subdivided facial units at the forehead (upper and lower central, upper and lower lateral, and temple), nasal (dorsum, tip, lateral wall, and alar lobules), and chin (central and lateral) regions were assessed by measuring the 3D mesh deviations between the smiling and resting facial models. The one-way analysis of variance, Duncan post hoc tests, and Student's t-test were used to determine the differences among the groups (α = .05). RESULTS. The smallest morphometric changes were observed at the upper and central forehead and nasal dorsum; meanwhile, the largest deviation was found at the nasal alar lobules in both the posed and spontaneous smiles (P < .001). The spontaneous smile generally resulted in larger facial unit changes than the posed smile, and significant difference was observed at the alar lobules, central chin, and lateral chin units (P < .001). CONCLUSION. The upper and central forehead and nasal dorsum are reliable areas for image matching between resting and smiling 3D facial images. The central chin area can be considered an additional reference area for posed smiles; however, special cautions should be taken when selecting this area as references for spontaneous smiles.

• Wind and Structures
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• v.37 no.4
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• pp.255-274
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• 2023

The aim of this paper is to enhance the accuracy of predicting time-averaged external surface pressures on low-rise buildings by utilizing Computational Fluid Dynamics (CFD) simulations. To achieve this, benchmark studies of the Silsoe cube and the Texas Tech University (TTU) experimental building are employed for comparison with simulation results. The paper is structured into three main sections. In the initial part, an appropriate domain size is selected based on the precision of mean pressure coefficients on the windward face of the cube, utilizing Reynolds Averaged Navier-Stokes (RANS) turbulence models. Subsequently, recommendations regarding the optimal computational domain size for an isolated building are provided based on revised findings. Moving on to the second part, the Silsoe cube model is examined within a horizontally homogeneous computational domain using more accurate turbulence models, such as Large Eddy Simulation (LES) and hybrid RANS-LES models. For computational efficiency, transient simulation settings are employed, building upon previous studies by the authors at the Windstorm Impact, Science, and Engineering (WISE) Lab, Louisiana State University (LSU). An optimal meshing strategy is determined for LES based on a grid convergence study. Three hybrid RANS-LES cases are investigated to achieve desired enhancements in the distribution of mean pressure coefficients on the Silsoe cube. In the final part, a 1:10 scale model of the TTU building is studied, incorporating the insights gained from the second part. The generated flow characteristics, including vertical profiles of mean velocity, turbulence intensity, and velocity spectra (small and large eddies), exhibit good agreement with full-scale (TTU) measurements. The results indicate promising roof pressures achieved through the careful consideration of meshing strategy, time step, domain size, inflow turbulence, near-wall treatment, and turbulence models. Moreover, this paper demonstrates an improvement in mean roof pressures compared to other state-of-the-art studies, thus highlighting the significance of CFD simulations in building aerodynamics.