• The Bulletin of The Korean Astronomical Society
• /
• v.43 no.1
• /
• pp.59.1-59.1
• /
• 2018

On 2018 February 5 a gamma ray burst with trigger time 04:25:29.3 UT was detected by Swift BAT and this event was named GRB 180205A. We observed the optical afterglow of GRB 180205A starting from about 1 hour after the burst until February 22 in the optical bands with the 1m telescope of Deokheung Optical Astronomy Observatory (DOAO), the 1m telescope at Mt. Lemmon Optical Astronomy Observatory(LOAO) and the 0.8m and 0.25m telescopes at McDonald Observatory. According to the fireball model, which is a well-accepted and conventional model for the afterglow of the GRB, the mechanism of the afterglow is that the expanding external blast wave of the GRB successively collides with the ambient medium and loses its energy, and as a result emits radiation at wavelengths longer than gamma rays. Here we present optical photometry and light curve of the afterglow in the R band and analyze it to characterize GRB 180205A.

• Journal of Korean Medical classics
• /
• v.24 no.6
• /
• pp.63-90
• /
• 2011

Safflower is a world-wide plant for multiple uses. flower of safflower is honghwa(紅花) which has been used for heart disease in oriental medicine. but its seed was not used in oriental medicine. after the publication of "Shinyak(神藥)" - the late 1980s, its seed(紅花子, hongwhassi) was known as good for bone fracture, osteoporosis and menopausal disorders. so many researchers studied hongwhassi and delivered lots of papers. the concern of each paper is different. this paper is a review paper. this paper studied documentary records about hongwhassi, and analyzed hongwhassi research trend. the trend consists of cultivation, ingredient analysis, osteoporosis, atherosclerosis, periodontal ligament and phytoestrogen. many papers lack of information about plant origin. so this paper supplements the standard form of plant origin(when sowing, where grow up, which direction, what kind etc).

• Korean Journal of Human Ecology
• /
• v.18 no.4
• /
• pp.825-840
• /
• 2009

The purpose of this study is to investigate the factors associated with marital satisfaction and stability among married men and women. The major findings of this study are as follows: the factors associated with marital satisfaction and stability are different between gender. For married women the positive communication with spouse strongly had positive effect on women's marital satisfaction, while destructive conflict strongly had negative effect on women's marital stability. Otherwise, married men's positive communication with spouse was the most important factor in the marital satisfaction. The emotional support of family-of-origin strongly had effect on men's marital stability. This study reveals that the emotional support from families of origin have a direct effect on needs for affection and autonomy, positive communication, destructive conflict patterns, sexual satisfaction, marital satisfaction and stability. Therefore, the results could be useful resources for family counselors and researchers to develop educational program for married couples.

• Journal of the Korean Society of Industry Convergence
• /
• v.23 no.1
• /
• pp.73-81
• /
• 2020

This study analyzed the causes of failure of SCM435 bolts that fix the springs of automobile air brakes that have been fractured during use. The cause of failure was analyzed using SEM, EDS, metallogical microscope and Vickers hardness tester. In the fracture, the ratchet mark began at the outer boundary of crack origin, and the grains at crack origin were found to have clear intergranular corrosion. One SCM435 bolt was subjected to a stress of 398 MPa, it's a stress of about 80% of the fatigue limit. As a result of such a large applied stress, cracks occurred at the corrosion origin and were fractured. In order to prevent the SCM435 bolt from fracture, it is necessary to use the correct composition, the accuracy of heat treatment, preventing damage by external impact, preventing corrosion of the damage part by moisture, and introduction a compressive residual stress by peening.

• Korean Journal of Head & Neck Oncology
• /
• v.28 no.1
• /
• pp.16-18
• /
• 2012

Ipsilateral tonsillectomy and panendoscopy-guided biopsy following imaging studies are considered a standard procedure in the search for a primary origin in patients with cervical metastatic carcinoma of unknown origin(MUO). However, many authors recommended bilateral tonsillectomy for the determination of the primary site of a MUO, because cervical metastasis may occur contralateral to tonsillar carcinoma. The authors attempted to address the clinical implications of using routine bilateral tonsillectomy to determine the primary site of MUOs based on a case report of cervical MUO that was finally diagnosed as a bilateral synchronous tonsillar carcinoma with cervical metastasis after a diagnostic work-up that included bilateral tonsillectomy.

• Journal of the Korean Society of Food Culture
• /
• v.30 no.3
• /
• pp.296-312
• /
• 2015

This study conducted a literature review, field study, and in-depth interview on the build order, cooking method, and origin of 'Donggot-tteok (rice cake)', which was the ritual food for 'Chungjae Gwon Beol from the Andong Gwon clan Jong-ga' in Bonghwa, Gyeongbuk, who deifies Chungjae Gwon Beol as Bulcheonwi. Donggot-tteok of Chungjae Jong-ga is classified as one kind of Bonpyeon (Janjeolpyeon) and 11 kinds of Utgipyeon, and assumes a unique circle build shape. According to the results of the literature review data in 2004 and 2010 with field study data in 2014, the build order, materials, and cooking method were maintained without large changes. With regard to Utgipyeon with which Donggot-tteok is topped, Cheongjeolpyeon, Milbiji, Songgisongpyeon, Gyeongdan, Ssukdanja, Bupyeon, Japgwapyeon, Jeon, Sansim, Jo-ak, and Kkaeguri were heaped in each layer, and the beauty of obangsaek (five colors) was well harmonized. Besides, with regard to the origin of Donggot-tteok, which was presented without elaborating sundry records, we examined the possibility of being introduced from the royal court through old paper and the Jokbo (family tree) that Jong-ga owns.

• Journal of the Korean Ceramic Society
• /
• v.46 no.2
• /
• pp.211-218
• /
• 2009

For the Y5V characteristic MLCC which is very prone to crack, it is important to to find out the basic cause of the crack. After finding out the crack origin, the materials and processes should be developed to remove the crack. The microstructures of the cracks were investigated using the fractographic method for the various types of cracks such as an exterior crack, a cyclic thermal shock crack, and an piezo-electric crack. It was found out that the crack origin was the pore at the end of the Ni inner electrode after bake-out. Even though the three dimensional crack shapes were different, the crack origins were seemed to be similar. The exterior crack could grow from the origin with the aids of residual and applied stress. FEM (finite element method) analysis was used to calculate the stress distribution of residual and applied stress. And the concept of fracture mechanics was applied for the explanation of the crack initiation and propagation from the stresses concentration.

• The Bulletin of The Korean Astronomical Society
• /
• v.38 no.1
• /
• pp.40.1-40.1
• /
• 2013

The HI ring serendipitously found in the Leo I galaxy group is unique in size in the Local Universe. It is ~200kpc in diameter with MHI~$1.67{\times}109M{\odot}$, surrounding a pair of early type galaxies M105 and NGC 3384. Its origin is still under debate whether it is the remnant of formation of a galaxy group (primordial) or formed from stripped material during galaxy-galaxy interaction (tidal origin). Intriguingly a number of dwarf galaxies have been identified along the gas ring (with or without optical counterpart). Various properties of these dwarf galaxies such as dark matter content, color, and/or metallicity will allow us to pin down the origin of this large scale HI ring. We have obtained a mosaicked CFHT MegaCam image and the EVLA HI cube of the large scale gas ring. In this work we present optical and gas properties of dwarf galaxies identified in the CFHT data.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.40 no.5
• /
• pp.815-825
• /
• 2015

DNP3(Distributed Network Protocol) is one of the most representative protocols which is used in SCADA(Supervisory Control and Data Acquisition) system. IEC 62351 is listing the integrity, confidentiality, availability and non-repudiation or accountability as the security requirement. However, IEEE Std. 1815 that is DNP3 standards does not define a mechanism for non-repudiation or accountability. In this paper, we propose a non-repudiation of origin technique about the sender of critical ASDU and implement the proposed scheme using software such as OpenSSL and SCADA source code library.

• Journal of the Korean Society of Costume
• /
• v.60 no.9
• /
• pp.41-57
• /
• 2010

Yunnan, where twenty-six minor ethnics live, is located in Southwest part of China. They have preserved and developed their folk costume, artcraft, music and dance in their peculiar way with natural and cultural surroundings. So, Yunnan is known as a living folk museum. It's worth examining how climate and circumstances change has affected certain differences of dress shape in same ethnic. Research into costumes of minor ethnics can contribute to the study of origin of the trousers, as this group of people have well succeeded the basic form of trousers through their cultural history and everyday life. This study, at first, investigates geographical surroundings of each minor ethnic group, and figures out the style of all trousers by measuring the each size, then compares design color pattern and fabric. The origin of trousers examined by formative characteristics has been classified and comparatively studied. The study materials are twenty-three trousers selected from in Yunnan Folk Museum as well as other relevant literature records. This study suggests that one can examine the type of human culture through the forms of costume which reflects folk custom geography economy etc. This, in turn, can be used as a basic information for other studies, and in particular, for the study of origin and structure of the trousers.