• 대한수학회논문집
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• 제21권2호
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• pp.337-345
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• 2006

John Harer conjectured that the canonical map from braid group to mapping class group induces zero homology homomorphism. To prove the conjecture it suffices to show that this map preserves the first Araki-Kudo-Dyer-Lashof operation. To get information on this homology operation we need to investigate the image of braiding under the Harer map. The main result of this paper is to give both algebraic and geometric interpretations of the image of braiding under the Harer map. For this we need to calculate long chains of consecutive actions of Dehn twists on the fundamental group of surface.

• Journal of Periodontal and Implant Science
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• 제25권1호
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• pp.121-132
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• 1995

Patients, who have gingival recession and complain of root sensitivity, or esthetic concerns, are candidates for root coverage. When free gingival grafting is used for complete root corverage, the results may not be entirely predictible unless the recession is shallow and narrow because a free gingival graft depends on collateral circulation from the lateral and apical parts of the recipient bed to survive over the avascular root. Various pedicle graft techniques can produce more esthetic results, but these procedures are only indicated when adequate donor tissues are available adjacent to the defect. This case report presents three cases for root coverage using the various connective tissue graft techniques. In the first case(Class III & IV), subepithelial connective tissue grafting was done and resulted in gingival coverage on the two-thirds of exposed root surface and blended with the adjacent tissue in color and texture. In the second case(Class I), connective tissue and partial thickness double pedicle graft resulted in complete coverage of denuded root surface. In the third case(Class I), recession was treated by supraperiosteal envelope technique. The root surface was covered completely and esthetically. Finally, the esthetics in both colors and tissue contours were acceptable to patients in all cases by the connective tissue grafting. However, in the case of the reduced interdental bone, the denuded root surfaces were hardly covered completely.

• 대한의생명과학회지
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• 제25권4호
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• pp.321-330
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• 2019

Carbapenem is recently considered as the last resort of the therapeutics for gram negative bacterial infection. Increasing of organisms producing metallo-β-lactamase (MBL), we have difficulty in choosing the antimicrobial agents. Among 345 clinical isolates of Pseudomonas spp., 61 isolates (17.7%) were positive for the modified imipenem or meropenem-Hodge test and 55 isolates (15.9%) were positive for the imipenem-EDTA + SMA double disk synergy test (DDS). PCR and sequencing of bla_VIM-2-allele and bla_IMP-1-allele showed that 17 isolates of Pseudomonas aeruginosa, 9 isolates of Pseudomonas taiwnensis and 2 Pseudomonas plecoglossicida had bla_VIM-2, and 22 isolates of P. aeruginosa and one Pseudomonas otitidis had bla_IMP-6. These MBL genes were all in class 1 integron. The size of class 1 integron with bla_VIM-2 ranged from 3.5 kb to 5.5 kb in clinical isolates of Pseudomonas spp. including P. aeruginosa. bla_VIM-2 was most often located first in the class 1 integron, sometimes in the second or third position, and these integrons often had aacA4 or aadA1. Strict infection control measures are needed to more effectively prevent further spread of these MBL-producing Pseudomonas spp. In addition, MBL-producing Pseudomonas spp. is expected to continue to spread in various countries and regions.

• 대한임상검사과학회지
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• 제51권4호
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• pp.444-452
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• 2019

주요 획득성 metallo-β-lactamase (MBL) 유전자에 의해 매개되는 carbapenem 내성, 특히 Acinetobacter spp. 균종의 임상 분리주에 대한 보고가 증가하고 있다. 본 연구에서 임상에서 비 중복으로 분리된 carbapenem 비감수성 Acinetobacter spp. 191주 중 125 (65.4%)주가 imipenem 혹은 meropenem-Hodge 변법시험에 양성이었고, 49 (25.7%)주가 imipenem-EDTA+SMA double disk synergy (DDS) 시험에 양성이었다. bla_VIM-2 allele와 bla_IMP-2 allele 검출을 위한 중합효소연쇄반응과 염기서열분석을 시행한 결과, A. baumannii와 A. calcoaceticus에서 각각 29주와 1주가 bla_VIM-2를 갖고 있었고, A. baumannii 16주와 A. calcoaceticus 2주가 bla_IMP-1을 갖고 있었다. A. genomospecies 3는 blaVIM-2와 bla_AIM-1을 동시에 갖고 있었다. 이들 MBL 유전자는 모두 class 1 integron에 있었다. bla_VIM-2 혹은 bla_IMP-6를 갖는 class 1 integron의 크기는 A. baumannii 분리주에서는 2.8 kb에서 3.2 kb이었고, A. genomospecies 3 분리주에서는 3.2 kb에서 3.5 kb이었다. bla_VIM-2는 대부분 class 1 integron에 첫번째 혹은 두번째에 위치하였고, aacA4를 흔히 가지고 있었다. 다양한 내성 유전자를 가질 수 있는 MBL 생성 Acinetobacter spp.뿐 아니라 다양한 내성 유전자를 가질 수 있는 integron의 전파로 imipenem이나 meropenem과 같은 carbapenem 내성을 포함하여 다제 내성 그람음성 세균의 증가가 예상된다. 또한, 위중한 Acinetobacter spp. 감염증 치료를 위한 새로운 항균제 개발이 필요하다.

• 한국해양공학회지
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• 제17권2호
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• pp.72-76
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• 2003

This paper presents the design concept and operation results of float-off for FSO (340,000 DWT Class, ELF AMENAM KPONO Project) built on the ground, without dry dock facilities. It was the first attempt to build FSO, completely, on the ground and launch it using DBU (Double Barge Unit, which was connected by rigid frame structure.) The major characteristics of FSO, which are similar to general VLCC type hull, including topside structure, weigh 51,000 metric ton. In order to have sufficient stability during the deck immersion of DBU, while passing through a minimum water plane area zone, proper trim control was completed with LMC (Load Master Computer). The major features of the monitoring system include calculation for transverse bending moment, shear force, local strength check of each connector, based on component stress, and deformation check during the load-out and float-off. Another major concern during the operation was to avoid damages at the bottom and sides of FSO, due to motion & movement after free-floating; therefore, adequate clearances between DBU and FSO were to be provided, and guide posts were installed to prevent side damage of the DBU casings. This paper also presents various measures that indecate the connector bending moment, damage stability analysis, and mooring of DBU during float off.

• 디지털융복합연구
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• 제18권2호
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• pp.455-462
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• 2020

이 연구는 초등학교 무용 예술강사의 교수지시형, 긍정적보상형에 따라 학생들의 수업만족도에 대한 수업몰입 및 지각된 유능감의 매개 효과를 분석하고자 하였다. 초등학교 표현수업에서의 무용 예술강사 역할은 수업만족도에 영향을 미칠 것이라는 판단에 수업몰입과 지각된 유능감의 이중 매개 효과를 통해 분석하고자 하였다. 이 연구는 B광역시 S교육청 소재 초등학생들을 모집단으로 선정하였다. 연구 설계에 준하여 비확률 표본추출방법 중의 하나인 편의표본추출법을 사용하여 표본을 추출하였다. 453부를 최종분석에 사용하였다. 자료처리는 Window용 SPSS 통계 Package 22.0 Version을 이용하여 빈도분석, 신뢰도분석, 탐색적요인분석, 상관관계분석 및 매개효과 검증을 실시하였다. 결과는 다음과 같다. 첫째, 초등학교 무용 예술강사의 교수지시형, 긍정적보상형 모두 수업만족도에 유의한 영향을 미치고 있는 것으로 나타났다. 둘째, 초등학교 무용 예술강사의 교수지시형, 긍정적보상형 모두 수업몰입을 통해 수업만족도에 유의한 영향을 미치는 것으로 나타나, 매개효과가 있는 것으로 검증되었다. 셋째, 초등학교 무용 예술강사의 교수지시형, 긍정적보상형 모두 지각된 유능감을 통해 수업만족도에 영향을 미치지 않는 것으로 나타나, 매개효과가 없는 것으로 검증되었다. 넷째, 초등학교 무용 예술강사의 교수지시형, 긍정적보상형 모두 수업몰입과 지각된 유능감을 통해서 수업만족도에 유의한 영향을 미치는 것으로 나타나, 이중 매개 효과가 있는 것으로 확인되었다.

• 응용통계연구
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• 제22권2호
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• pp.387-402
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• 2009

In this paper we have considered the problem of estimating the population mean $\bar{Y}$ of the study variable y using auxiliary information in presence of non-response. Classes of estimators for $\bar{Y}$ in the presence of non-response on the study variable y only and complete response on the auxiliary variable x is available, have been proposed in different situations viz., (i) population mean $\bar{X}$ is known, (ii) when population mean $\bar{X}$ and variance $S^2_x$ are known; (iii) when population mean $\bar{X}$ is not known: and (iv) when both population mean $\bar{X}$ and variance $S^2_x$ are not known: single and two-phase (or double) sampling. It has been shown that various estimators including usual unbiased estimator and the estimators reported by Rao (1986), Khare and Srivastava (1993, 1995) and Tabasum and Khan (2006) are members of the proposed classes of estimators. The optimum values of the first phase sample size n', second phase sample size n and the sub sampling fraction 1/k have been obtained for the fixed cost and the fixed precision. To illustrate foregoing, we have carried out an empirical investigation to reflect the relative performance of all the potentially competing estimators including the one due to Hansen and Hurwitz (1946) estimator, Rao (1986) estimator, Khare and Srivastava (1993, 1995) and Tabasum and Khan (2006) estimator.

• 동남아시아연구
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• 제22권2호
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• pp.133-170
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• 2012

This thesis aims to analyze the political, social, and cultural activities of the Acehnese ethnic group living in Jakarta, Indonesia. Based on analysis, this thesis examines how their ethnicity and national identity have been formed and expressed. For this purpose, this study deals with Taman Iskandar Muda (hereinafter referred to as TIM), a group of Acehnese transmigrants living in Jakarta. The immigration of the Acehnese to Jakarta started in the 1950s and the number of Acehnese people living in Jakarta persently amounts to 100,000. TIM, which was organized by the first generational of immigrants, functions to group Acehnese immigrants of various generations and class. Forum Keprihatinan Untuk Aceh(hereinafter referred to as Forka), an organization designed to solve the political problems of TIM, undertook various activities to maintain the peace of Aceh as the representative of TIM. Through those activities, TIM and Forka were able to confirm the feeling of homogeneity among the Acehnese who were living in their hometown and also strengthen their identity within the organizations. However, the fact that TIM and Forka put their focus on humanitarian activities paradoxically shows the political limitations that they sustain. TIM and Forka take care not to make their humanitarian activities seem as if they intend to openly strengthen their Acehnese identity and deny their Indonesian one. These political characteristics of Forka's identity are commonly found in groups that practice long-distance nationalism, as transmigrants in diaspora circumstances do. In the organization of TIM, there exists the menasah, which is a space where discussions of the ethnicity and the nation are practiced. As it is the space for local exchange, menasah reveals the identity of TIM through educational/social activities and public services. Menasah functions as the public arena where people practice ethnic identity on the basis of national integration. As a minority ethnic group living in Jakarta and its neighborhood, they are accustomed to double and selective political activities, social activities, and cultural practices. In order to adapt themselves to the double circumstance that they are faced with, they should live extemporaneously, and this life may be the fate that minority ethnic and transmigrants should endure.

• 대한치과교정학회지
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• 제18권2호
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• pp.367-385
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• 1988

In case of skeletal Class III malocclusion with underdeveloped maxilla, the extraoral orthopedic force for the stimulation of maxillary growth or anterior reposition of the maxilla has been used clinically for the improvement of facial skeletal relationship. The purpose of this investigation was to examine the initial reaction of maxillofacial complex to the maxillary protraction by using extraoral orthopedic force. The dried human skull was used and this investigation was done by means of double exposure holographic interferometry. The protraction forces placed on the canine or the first molar were parallel, $10^{\circ}$ downward, $20^{\circ}$ downward to the occlusal plane. Fringe pattern of each protraction condition was compared and analized. The results were as follows: 1. Each maxillofacial bone displaced saparately. 2. More displacement was shown at the area of the teeth and the alveolar bone. 3. A counterclockwise rotation of the maxilla wa decreased by downward protraction and especially 20 degree downward protraction from the canine showed least rotation. 4. On the zygomatic arch, outward bend was observed and this effect was decreased by downward protraction. 5. On the zygomatic bone, the counter clockwise rotation was increased by the downward protraction. 6. When maxillary expansion was applied at the same time, outward and upward displacement with counterclockwise rotation was observed on the maxilla. 7. The lateral pterygoid plate of sphenoid bone was affected by maxillary protraction.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 춘계학술대회 논문집
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• pp.484-489
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• 2011

In this paper, it was described the current technology status of bearingless rotor hub system for helicopter which is one of major rotor hub system. Also, a conceptual study on the new bearingless rotor hub system of helicopter was described. First, the advantages and disadvantages of major helicopter rotor hub system are described in comparison to each other types of rotor hub system. The unique characteristics of bearingless rotor hub system are described compared to other types of rotor hub systems. Next, the main function, role and characteristics of the sub-components of bearingless rotor hub system are described. Recent helicopters which adopt this bearingless rotor hub system are described and introduced. This conceptual study shows that double-H sectional construction and rectangular construction of flexbeam are the most effective candidates of this new bearingless rotor system. This bearingless rotor hub system can be used for 7,000lbs class helicopter. Now, a further trade-off study will show.