• Journal of KIISE:Software and Applications
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• v.28 no.12
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• pp.875-884
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• 2001

Although the self organizing map (SOM) is widely utilized in such fields of data visualization and topology preserving mapping, since it should have the topology fixed before trained, it has some shortcomings that it is difficult to apply it to practical problems, and classification capability is quite low despite better clustering performance. To overcome these points this paper proposes the dynamic topology preserving self-organizing map(DTSOM) that dynamically splits the output nodes on the map and trains them, and attempts to improve the classification capability by combining multiple DTSOMs K-Winner method has been applied to combine DTSOMs which produces K outputs with winner node selection method. This produces even better performance than the conventional combining methods such as majority voting weighting, BKS Bayesian, Borda, Condorect and reliability sum. DTSOM remedies the shortcoming of determining the topology in advance, and the classification rate increases significantly by combing multiple maps trained with different features. Experimental results with handwritten digit recognition indicate that the proposed method works out to problems of conventional SOM effectively so to improve the classification rate to 98.1%.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.123.2-123.2
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• 2011

Self-preservation effect was identified by means of macroscopic dissociation experiments after keeping natural gas hydrate samples at 258 K for 15 days. The hydrate samples were formed using synthetic natural gas hydrate whose compositions are 90% $CH_4$, 7% $C_2H_6$, and 3% $C_3H_8$. In addition, during the formation, heavy hydrocarbons of propane and ethane are found to occupy hydrate cages in a more favorable way than methane so as to change the gas composition after hydrate formation. Experimental results obtained in this study can provide useful information on applications of natural gas hydrate for storing or transporting natural gas in the form of solid hydrate.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.2
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• pp.625-631
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• 2021

This study examined the effects of self-critical perfectionism on organizational citizenship behavior (OCB) and the moderating effects of gender in the relationship to understand deeply the dilemmatic situation resulting from OCB at the individual level. In other words, based on the conservation of resources theory, this study examined how self-critical perfectionism influences the OCB and how gender moderates the relationship between self-critical perfectionism and OCB. More specifically, this study predicts that self-perfectionism will be negatively related to OCB. Furthermore, this negative relationship between self-critical perfectionism and OCB will be strengthened in men compared to women. To test these hypotheses, the supervisor-subordinate survey was conducted, and 150 dyad data were analyzed. The analytical results of HLM (Hierarchical Linear Modeling) showed that self-critical perfectionism negatively influenced the OCB, and this negative effect was strengthened in men compared to women. This paper suggests implications and limitations for the literature on OCB.

• Korean Chemical Engineering Research
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• v.51 no.5
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• pp.602-608
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• 2013

Gas hydrate studies are attracting attention of many researchers as an innovative, economic and environmentally friendly technology when it is applied to $CO_2$ capture, transport, and storage. In this study, we investigated whether $CO_2$ hydrate shows the self-preservation effect or not, that is the key property for developing a novel $CO_2$ transport/storage method. Especially the degree of self-preservation effect for $CO_2$ hydrate was studied according to the particle size of $CO_2$ hydrate samples. We prepared three kinds of $CO_2$ hydrate samples varying their particle diameter as millimeter, micron and nano size and measured their change of weight at $-15{\sim}-30^{\circ}C$ under atmospheric pressure during 3 weeks. According to our experimental result, the lower temperature, larger particle size, and compact structure for higher density are the better conditions for obtaining self-preservation effect.

• Journal of Digital Contents Society
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• v.18 no.3
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• pp.475-483
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• 2017

This study attempted to investigate how the effectiveness of value-oriented promotion for media contents depends on self-construal and incorporated Schwartz' value system theory(1992) and Gutman's means-end chain theory(1982) into the development of hypotheses. It was expected that media content promotion emphasizing "openness to change" value would be more appealing to those with independent self-construal, whereas media content promotion emphasizing "conservation" value would be more appealing to those with interdependent self-construal. These hypotheses were generally supported in a series of experiments. Also, the dynamic relationship among the four primary value dimensions proposed by Schwartz (i.e., openness to change, conservation, self-enhancement, self-transcendence) was clearly validated in this study.

• Korean Journal Plant Pathology
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• v.12 no.2
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• pp.142-146
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• 1996

옥수수 깜부기병균 Ustilago maydis 동포자를 풍건한 후 모래나 silica gel을 보존매체로 해서 4$^{\circ}C$나 그 이하 온도에서 24개월 두었을 때 동포자 생존율은 40~45%였다. 동포자는 28$^{\circ}C$ PDA상에서 쉽게 발아하여 많은 소생자를 형성하였다. U. maydis 동포자로부터 소생자 형성의 최적배지는 corn meal broth였고, carrot broth와 potato-dextrose broth의 순으로 좋았다. 소생자 형성에 가장 적합한 조건은 온도 28~3$0^{\circ}C$, pH5~7이었다. 소생자 형성은 암조건에서 보다 좋았다.

• Horticultural Science & Technology
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• v.29 no.2
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• pp.110-115
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• 2011

To examine the availability of onggi (earthenware) as a floral vase, we compared the vase life of cut gerberas (Gerbera jamesonii) with generally used vases made of glass and porcelain. After holding cut gerbera 'Honeymoon' and 'Golden Time' in vases made of glass, porcelain, and onggi containing holding solution (tap water or preservative solution), vase life, fresh weight, and water uptake of cut flowers, and total number of microbes in holding solution were collected. In onggi vase, vase life of both the cultivars was longer than the other vases and floral preservative prolonged vase life compared with tap water. Cut gerberas applied with preservative solution in onggi vase maintained their ornamental value for more than 14 days. Cumulative water uptake by cut gerberas was greatest in onggi vase, where 'Honeymoon' and 'Golden Time' absorbed water by 19.2 and 15.8 mL, respectively, for 10 days. Fresh weight of cut flowers in onggi vase was greater than those of the others, and the preservative solution delayed the reduction of fresh weight compared with tap water. Especially, onggi vase with preservative solution maintained 89% of the initial fresh weight at the 8th day of the treatments due to smooth water uptake with comparison with 71% in porcelain. Total number of microbes in the holding solution was smallest in onggi vase. At the 8th day, microbes number in onggi vase was 435 cfu/mL, that was 20-30% level of those of glass and porcelain vases. In conclusion, onggi vase inhibited microbial proliferation in holding solution, maintained water uptake by cut flower, and delayed bending of flower stalks due to vascular blockage, and then prolonged vase life in gerbera. Therefore, onggi with numerous micropores will be a good material for flower vase and preservative solution can improve its function.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.5 no.3
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• pp.78-87
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• 1994

생물학 및 의학등의 생명과학에서는 현미경을 이용하여 생체물질 즉, 생체조직을 관찰하고 이에 대한 조직의 검사 결과를 판정하고 발표한다. 이때 필히 고정과정(fixation process)을 거쳐야 한 다. 즉, 생체조직중 조직의 구조, 특정 세포나 바이러스 및 효소등을 관찰할 때 고정과정을 거쳐 조직을 절편하고 이를 염색하여 현미경으로 검사하게 된다. 고정과정이란 생체물질을 안정화시키고 자기분해 혹은 부패를 방지하여 보존이 가능하도록 변화시키 는 과정으로, 조직내의 용해성 물질을 불용성 물질로 변형시키는 과정이다. 고정과정을 거친 생체조직 은 구조를 보존하고 있기 때문에 조직의 훼손이 없는 상태에서 절편이 가능하고 또한 염색상태를 좋게 하며 관찰시 contrast를 증진시킨다. 만약 고정과정을 거치지 않으면 물질의 세포막이 파괴되고 단백질 등의 물질이 용해되어 조직의 변형을 일으켜 제대로 조직을 관찰할 수 없게 된다. 고정과정에는 크게 화학적 고정법과 물리적 고정법이 있다. 화학적 고정법은 생체조직을 화학용액에 처리하는 방법이며, 물리적 고정법은 직접적인 열 혹은 초음파등으로 물질을 고정시키는 방법이다. 표 면과 내부의 열전도가 달라져 고정이 균일하게 되지 않는 단점을 가지고 있기 때문에 보통 2~6일의 고 정시간을 요하는 화학적 고정법을 사용하고 있다. 따라서 조직에 대한 총 검사시간이 최소 6일에서 최 대 12일이 요구된다. 병원등에서 조직검사의 결과가 늦게 발표되는 사유는 바로 화학적 고정법을 사용 하여 생체조직을 관찰하고 그 결과를 판정하기 때문이다. 본 고에서는 마이크로파를 이용하여 약 3시간만에 조직의 상태를 관찰할 수 있는 고정법을 소개한다. 마이크로파를 이용하여 조직을 고정하는 고정방법을 기존의 고정법과 비교하여 이들의 장단점을 나타 낸다. 본 연구자에 의해 개발된 마이크로파 고정기를 소개하고, 이를 이용하여 생체물질을 고정한뒤 절 편, 염색하여 현미경 관찰결과를 발표하여 본 연구의 방법이 기존 방법보다 우수함을 나타낸다.

• Journal of Korean Orthopaedic Sports Medicine
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• v.4 no.1
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• pp.60-64
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• 2005

Rupture of the adductor longus muscle of the thigh is a rare muscular injury. It is produced by several causes, such as trauma. Ultrasonography and magnetic resonance imaging need to differential diagnosis to other disease. Successful results by conservative management, surgical repair is indicated in the fresh rupture. 18-year-old, 17-year-old, and 20-year-old male patient were diagnosed as having a adductor longus rupture by means of physical examination, ultrasonography, and magnetic resonance imaging. One patient was treated by physical treatment, the other patients were treated by surgical excision. We report three cases of adductor longus rupture with a brief review of literature.

• Journal of Conservation Science
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• v.31 no.2
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• pp.131-145
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• 2015

Cultural assets restoration is being considered highly as a practical way to extend the lifespan of damaged cultural assets and re-highlight their value. However, restoration process has been mostly dependent on the manual work involving the experience and skill of a person performing restoration, thereby requiring much time and effort. In recent, it became possible to apply a method allowing restoration to be performed more accurately and easily according to the material characteristics and shape of cultural assets. Namely, it is to use a method of printing out the 3D shape data computed in computer as real object by using 3D printer for the restoration that has been performed manually. The missing part of a cultural asset is computed into computer data first and is printed out by using 3D printer to undergo a simple shaping process. The result of 3D printer application showed that repetitive output and shape and figure revision of digital data were possible, and it was possible to improve the degree of completedness of restoration through test output using various types of restoration materials using various materials. For the purpose of verifying the possibility of applying 3D printer to restore missing part of earthenware, two pieces of modern reproductions, namely, the Seven Treasure Incense Burner and Earthenware with Wagon Wheel Decoration, were artificially damaged. The restoration result showed that compared to manual work, it showed better effectiveness in curtailing work time and reproducing accurate shape. On the other hand, secondary manual work was slightly needed for detailed binding and to vividly express surface texture.