• Communications of the Korean Mathematical Society
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• v.17 no.3
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• pp.531-534
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• 2002

We prove that the star operator and the sequential closure operator on a weakly first countable space are the same and show that the Frechetness is a sufficient condition for a weakly first countable space to be first countable.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.11 no.5
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• pp.297-306
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• 1986

This paper surveys circuit switching local area networks(LANs) whit topology of ring, mesh, bus and star. Emphasis of this study is given on the conceptual switching technologies of these LANs.

• The monthly packaging world
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• s.101
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• pp.180-189
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• 2001

Asia Star Award는 매년 아시아포장연맹(APF) 회원국의 유대 강화와 협력체제의 구축 및 각종 정보교류를 위해 열리고 있는 APF 행사의 일환으로 열리는 전시$\cdot$시상제도로서 1997년에는 우리나라에서 개최된 바 있다. 2000 APF 행사에는 총 8개국이 참가하여 67개 작품이 소개됐다. 이중 국내 작품으로는 LG 화학의 오휘 기초화장품, 이자녹스 화장품, 더블리치 염색제가 선정되었다. 본 고에서는 Asia Sta

• Journal of The Korean Astronomical Society
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• v.29 no.spc1
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• pp.159-160
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• 1996

Recent high resolution CO observations of normal and starburst galaxies at Owens Valley Millimeter Array are summarized. While normal disk galaxies generally show exponential distribution which follows the optical blue light, starburst galaxies are often characterized by a compact ($\~$1 kpc) nuclear complex whose surface gas mass density is strongly correlated with the observed large infrared luminosity and thus the ongoing massive star formation.

• Journal of Applied and Pure Mathematics
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• v.4 no.5_6
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• pp.317-329
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• 2022

In this paper we investigate the pair difference cordial labeling behaviour of m- copies of K₄, subdivision of star, fan, comb graphs.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.2
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• pp.169-176
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• 2012

This paper uses loop-star basis functions to overcome the low frequency breakdown problem in method of moments (MoM) based on electric field integral equation(EFIE). In addition, p-Type Multiplicative Schwarz preconditioner (p-MUS) technique is employed to reduce the number of iterations required for the conjugate gradient method(CGM). Low frequency instability with Rao Wilton Glisson(RWG) basis functions in EFIE can be resolved using loop-start basis functions and frequency normalized techniques. However, loop-star basis functions, consisting of irrotational and solenoidal components of RWG basis functions, require a large number of iterations to calculate a solution through iterative methods, such as conjugate gradient method(CGM), due to high condition number. To circumvent this problem, in this paper, the pMUS preconditioner technique is proposed to reduce the number of iterations in CGM. Simulation results show that pMUS preconditioner is much faster than block diagonal preconditioner(BDP) when the sparsity of pMUS is the same as that of BDP.

• Industry Promotion Research
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• v.5 no.3
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• pp.105-122
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• 2020

The purpose of this thesis is to contemplate Astrology, 28 Fixed star, and Naksatra. The goal of this study was to look through the birth process of Astrology in the classical literature, and to examine how it can be applied to each individual's life by looking into the meaning of 28 Fixed star and Nakshatra. From the literary review, Astrology existed among the Babylonians 1000 BC and it originated from the start of calling by naming the animal. Assyrians called it "the zodiac is the Way of the Moon" which was written on Molapin in the Enuma Anu Enil, the clay plate recorded by Assyrians. Therefore, it was found that the zodiac, called Astrology, was made through the movement of the moon. There are also 28 stars in 배도, which is the way the moon passes, and it is called 28 Fixed star. 28 Fixed Star is called Nakshatra in India and can read the natural destiny of an individual through Nakshatra., Knowing the lunar month and date, you can find the individual Nakshatra and choose the best life in the framework of your natural destiny. Therefore, this researcher reviewed the literature on Astrology, 28 Fixed Star and Nakshatra and suggested the utilization plan. I hope this study will help the related field in the future.

• Journal of Korean Society for Geospatial Information Science
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• v.24 no.1
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• pp.61-68
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• 2016

Digital aerial images have been commonly used in a large scale map production owing to their excellent geometry, and high spatial and radiometric resolution in recent years. However, a quality verification process for acquired images should be preceded in order to secure the high precision and reliability of produced results. Several experimental studies to verify digital imaging systems have been vigorously researched by constructing permanent test field in abroad. On the other hand, it is urgently necessary to suggest a practical scheme for an image quality verification, because this related study and experiment are still in its early stage at home. Hence, this study aims to present an easy method to measure the spatial resolution of the image in a visual way using a portable Siemens star. The images used in the study were obtained with three different cameras, two frame array sensors of DMC, UltraCamXp and a linear array sensor of ADS80. The Siemens star target appeared in every image is extracted and then the spatial resolution of image is compared with theoretical GSD(Ground Sample Distance) by a visual method. In addition, the change of spatial resolution depending on the location of the Siemens star from image center and flight direction and cross-flight direction is also compared and analyzed. As study results, while the theoretical GSDs of images taken with each camera are about 6~9cm, the visual resolutions are 1.2~1.3 times as great as the theoretical ones.

• Asian-Australasian Journal of Animal Sciences
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• v.32 no.11
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• pp.1753-1762
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• 2019

Objective: The study was aimed to compare carcass traits, physicochemical and textural properties of meat in two different genotypes of Pekin ducks with regard to sex effect. Methods: The study involved 120 Pekin ducks: 30 males and 30 females of strain P33 (Polish native Pekin ducks) and 30 males and 30 females of Star 53 HY (commercial hybrid Pekin ducks). At 49 d of age, 48 birds (12 males and 12 females of each genotype) were selected for dissection. After the dissection, meat samples were collected to determine meat quality traits. Results: The studied Pekin ducks of different genotype showed significant differences in body weight, carcass weight, dressing percentage, as well as percentages of breast muscles, skin with subcutaneous fat, abdominal fat, neck, and remainders of eviscerated carcass with neck. Duck genotype influenced the content of crude protein, crude fat, Na, K, P, Zn, $pH_{24}$, electric conductivity ($EC_{24}$), cooking loss, $L^{\star}$, $a^{\star}$, most textural traits of breast muscle, and also Na, Mg and Fe content, $EC_{24}$, drip loss, cooking loss and $L^{\star}$, $a^{\star}$, and $b^{\star}$ colour coordinates of leg muscles. Regardless of genetic origin, males exhibited higher BW, carcass weight and carcass neck percentage, as well as lower redness, hardness, chewiness and gumminess of breast muscle compared to females. The genotype${\times}$sex interaction was significant for the crude fat content and cooking loss of breast muscle, and for the yellowness of leg muscle. Conclusion: Star 53 HY ducks are more suited for broiler production due to their higher body weight and dressing percentage. Their breast and leg meat are characterized by more beneficial chemical composition but has poorer sensory and textural properties compared to the meat of P33 ducks.

• Archives of Plastic Surgery
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• v.46 no.5
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• pp.462-469
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• 2019

Background Incisional hernia is a common complication following visceral organ transplantation. Transplant patients are at increased risk of primary and recurrent hernias due to chronic immune suppression and large incisions. We conducted a retrospective review of patients with a history of liver or kidney transplantation who underwent hernia repair to analyze outcomes and hernia recurrence. Methods This is a single center, retrospective review of 19 patients who received kidney and/or liver transplantation prior to presenting with an incisional hernia from 2011 to 2017. All hernias were repaired with open component separation technique (CST) with biologic mesh underlay. Results The mean age of patients was $61.0{\pm}8.3years\;old$, with a mean body mass index of $28.4{\pm}4.8kg/m^2$, 15 males (78.9%), and four females (21.1%). There were seven kidney, 11 liver, and one combined liver and kidney transplant patients. The most common comorbidities were hypertension (16 patients, 84.2%), diabetes (9 patients, 47.4%), and tobacco use (8 patients, 42.1%). Complications occurred in six patients (31.6%) including hematoma (1/19), abscess (1/19), seroma (2/19), and hernia recurrence (3/19) at mean follow-up of $28.7{\pm}22.8months$. With the exception of two patients with incomplete follow-up, all patients healed at a median time of 27 days. Conclusions This small, retrospective series of complex open CST in transplant patients shows acceptable rates of long-term hernia recurrence and healing. By using a multidisciplinary approach for abdominal wall reconstruction, we believe that modified open CST with biologic mesh is a safe and effective technique in the transplant population with complex abdominal hernias.