• 한국항공우주학회지
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• 제45권1호
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• pp.71-78
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• 2017

한국형 기동헬기(KUH)의 전원계통은 항공기의 안정성을 높이기 위하여 이중 시스템으로 이루어져 있고, 각 전원 시스템은 생존성 향상을 위하여 항공기 좌/우측에 배치되어 있다. 전원 계통을 구성하는 주요 장비는 교류 발전기, 보조동력장치 발전기, 직류변환기, 교류/직류 전원분배제어 장치 등이다. 교류/직류 전원분배제어장치(AC/DC EMB)는 2개의 AC EMB와 2개의 DC EMB로 구성되어 있으며, 항공전자 장비 운용에 필요한 전원을 공급, 분배 및 제어하는 역할을 수행한다. KUH 초도양산 기간 중 AC EMB가 내부 단락(Short)으로 인한 결함이 발생하였고, 이에 대한 설계개선을 추진하였다. 본 논문에서는 AC EMB의 결함현상 분석, 고장탐구 과정, 발생원인, 설계변경을 통한 개선 결과 등을 기술하였다.

• 한국해양공학회지
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• 제32권2호
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• pp.95-105
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• 2018

An FLNG (floating liquefied natural gas) or LNG FPSO (floating production, storage and offloading) unit is a notable offshore unit with the increasing demand for LNG. The liquefaction process on an FLNG unit is the most important process because it determines the economic feasibility, but would be a hazard source because of the large quantity of hydrocarbons. While a high efficiency process such as C3MR has been preferred for onshore liquefaction processes, a relatively simple process such as the SMR (single mixed refrigerant) or DMR (dual mixed refrigerant) liquefaction process has been selected for offshore units because they require a more compact size, lighter weight, and higher safety due to their space limitation for facilities and long distance from shore. It is known that an SMR has the advantages of a simple configuration, small footprint, and lower risk. However, with an increased production rate, the inherent safety of SMR needs to be evaluated because of its small train capacity. In this study, the potential explosion risks of the SMR and DMR liquefaction processes were evaluated at the conceptual design stage. The results showed that an SMR has a lower overpressure than a DMR at the same frequency, only with a small production capacity of 0.9 MTPA. With increased capacity, the overpressure of the SMR was higher than that of the DMR. The increased number of trains increased the frequency in spite of the small amount of equipment per train. This showed that the inherent risk of an SMR is not always lower than that of a DMR, and an additional risk management strategy is recommended when an SMR is selected as the concept for an FLNG liquefaction process compared to the DMR liquefaction process.

• International Journal of Industrial Entomology and Biomaterials
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• 제2권1호
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• pp.19-26
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• 2001

Transformed Spodoptera frugiperda (Sf9) cells expressing baculovirus very late factor (VLF-1) were constructed by using Autograha nuclear polyhedrosis virus (AcNPV) immediate earthy gene (ie1). Neomycin-resistance gene as a selectable marker was introduced under the control of AcNPV ie1 promoter, and Bombyx mori nuclear polyhedrosis (BmNPV-K1) vlf-1 gene was introduced under the control of the Drosophila heat shock protein gene (hspr70) promoter to yield dual expression plasmid with two independent transcription units. It was transfected into Sf9 cells and cell clones expressing vlf-1 were selected by G4l8 treatment. Genomic DNA from transformed cells was isolated and integration of AcNPV iel harboring vlf-1 was confirmed by PCR using AcNPV iel-specific primers and Southern blot analysis. The transformed cells expressing VLF-1 in an infection-independent manner expressed foreign gene product of recombinant baculovirus in the earlier stage of infection compared with control Sf9 cells. These results suggest the possible to develop highly efficient transformed insect cells for baculovirus expression vector system.

• International Journal of Automotive Technology
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• 제8권6호
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• pp.799-806
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• 2007

One method for improving the torque capacity of the CVT is to use a split-powered CVT(SPCVT) to reduce the power transmitted into a continuously variable unit(CVU). A variable bridge SPCVT with two planetary gear units(PGUs), which are composed of a sun gear, a ring gear, and carrier and planetary gears, can minimize the power to the CVU. However, a SPCVT with a conventional CVT should possess a dual mode, which would allow the conventional CVT to be used at high speeds and an additional gear train to be used at low speeds. The inner-spherical CVU(ISCVU) with an inner and outer spherical contact mechanism developed in this study can cover the range from low to high speeds. The rated power and the overall speed ratios were 100 kW and $0.09{\sim}0.36$, respectively. Power efficiency was numerically calculated to be over 90% over the speed ratio range of $0.1{\sim}0.29$. The maximum shear stress at the two contact areas of the rotor pairs, the minimum life and the overall size were estimated to be 700 MPa, 276 kh and $350{\times}350{\times}400mm^3$, respectively. This study shows that an ISCVU and a variable bridge type PGU can realize the SPCVT with a single mode for a vehicle.

• 건축역사연구
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• 제11권2호
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• pp.23-35
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• 2002

Even though there have been greate changes in the types and contents of the housing plan in Korea since the Modem age, it seems that the identity of traditional dwelling culture is still remains within it. The purpose of this study is to examine the characteristics and features in the development of the 'Public Standard' Housing Unit Plan by comparing the differences and similarities in unit plans in housings built on Japanese occupation period and those built after the period. From the study, we can conclude as follows: 1. The public standard housing unit plans on both periods have shown the common features in the composition of their physical forms in the way that the front-row area still remains the traditional housing culture and the rear-row area reflects the desires of the modem lives. The structure of the dual-row unit plan appeared in the public standard housing plan was caused by the cultural acculturation in Japanese occupation period. 2. The public standard housing unit plans, however, show the differences in the contents and meaning in units plans with the them of the Japanese housing because of the cultural differences. These differences took placed autonomously through the change of housing plans in the modern time, and have the common features such that 1) the changes in the Maru-centered plan type differ in composition from the inner-corridor plan type used Japanese housing, and 2) the composition of the open-inner spaces in the double-row housing plan reflects the single-row outer open space In the traditional housing. All of these cultural progresses in the public standard housing unit plans was took place as the result of the inner-oriented and notional circulations derived from the modernity. However, the transformed unit plans still contains the identity derived from the variation of the traditional Korean building elements such as Maru and Ondol. In other words, those are the Maru-centered and composed housing plans with juxtaposition of the inner block and the outer block. As the conclusion, though the public standard dwelling unit plan has the similarity in the physical form, it is different in the cultural Identity and meaning from the public standard plans before the independence from the Japan occupation.

• 천문학회지
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• 제46권6호
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• pp.225-234
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• 2013

We develop a radio receiver system operating at ${\lambda}{\sim}1.3$ mm for the 6 m telescope of Seoul Radio Astronomy Observatory. It consists of a dual polarization receiver, a couple of IF processing units, two FFT spectrometers, and associated software. By adopting sideband-separating superconductor mixers with image band terminated to waveguide load at 4.2 K, we achieve $T_{RX}{\leq}100$ K and $T_{sys}$ less than 150 K at best weather condition over 210-250 GHz frequency range. The intermediate frequency signal of 3.5-4.5 GHz is down converted to 0-1 GHz and fed into the FFT spectrometers. The spectrometer covers 1 GHz bandwidth with a spectral resolution of 61 KHz. Test observations are conducted toward several radio sources to evaluate the performance of the system. Aperture and beam efficiencies measured by observing planets are found to be typically 44 ~ 59% and 47 ~ 61%, respectively over the RF band, which are consistent with those measured at 3 mm band previously.

• 한국음향학회지
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• 제24권1호
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• pp.52-57
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• 2005

AMR-WB 음성부호화기는 50~7000 Hz의 확장된 대역폭을 갖는 음성신호를 압축/복원하는 광대역 음성부호화기로써 6.60 kbit/s에서 23.85 kbit/s까지 9개의 전송 비트율을 가지고 있다. 본 논문에서는 2개의 MAC (Multimply and-Accumulate) 유닛을 가진 Tl의 16bit 고정소수점 DSP인 TMS320C5509 DSP를 이용한 AMR-WB 음성부호화기의 실시간 구현에 관하여 논한다. 실시간 구현은 intrinsic을 이용한 C수준의 구현 및 어셈블리 코딩에 의한 구현을 수행하여 그 결과를 비교하였다. 어셈블리 코딩에 의하여 실시간 구현된 AMR-WB 음성부호화기는 23.85 kbit/s 모드에서 42.9 Mclock의 계산량을 가지며, 사용된 프로그램 메모리는 15.1 kword이고, 데이터 ROM 메모리는 9.2 kword이고 데이터 RAM 메모리는 13.9 kword이다.

• 한국의류학회지
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• 제35권2호
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• pp.146-155
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• 2011

This study examines the design characteristics of figure skating costumes by a content analysis of their design elements. The content analysis method for the study was used based on 185 photos of female figure skaters. A total of 218 coding units in 15 categories were used. In the category of color, unicolor costumes were the mainstay and represented 48.11% of the total costumes. Black costumes showed the highest rate (13.51%), followed by red (7.57%) and blue (7.03%). In the dual-color costumes, combinations of red and black and white and black, represented 4.32% of all costumes. A camisole was the most popular type of neckline (20.54%). Stand collars with neck decorations were found in 5.95% of the costumes. In addition, 98.2% of all figure skating costumes had decorations (crystal beads 21.86% were the most frequently used decoration type), 65.41% exposed all the shoulders and arms, 70.81% of the costumes did not have sleeves, 5.41% of the costumes had arm decorations, and 3.78% had wrist decorations. In the analysis of the hem of skirts, 32.40% had a curved line, 30.73% had a straight line, and 15.08% had an unrecognizable form. In general, the figure skating costumes have stand collars with neck decorations, arm and wrist decorations, and irregular skirt hems that are not found in everyday dresses. To emphasize and intensify a theatrical effect, the costumes were fabulously decorated with spangles, crystal beads, feathers, and lace; black, red, and blue were frequently used. The skirts had frills, fringe, flared lines, and beads on them to reflect the stage lights and emphasize movements.

• 한국조리학회지
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• 제17권5호
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• pp.139-153
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• 2011

본 연구는 호텔기업의 브랜드 증거가 전환과 관계성과에 대한 인과관계를 파악하여 차별화되고 경쟁력 있는 유용한 정보를 제공하고자 하였다. 표본의 단위는 서울지역의 브랜드 증거를 전환한 호텔고객들이 조사에 참여하였으며, 2011년 6월 10일부터 2011년 7월 20일까지 총 500부를 배포하고 이중 408부에 대하여 SPSS 18.0과 AMOS 18.0을 이용하여 요인분석과 신뢰성 검증을 실시하고, 제시된 연구가설을 검증하기 위해서 공분산구조분석을 실시하였다. 분석결과 종사자서비스는 전환장벽과 전환비용에 유의한 영향을 미치는 것으로 나타났으며, 브랜드 네임은 전환장벽과 전환비용에, 이미지 일치성은 전환장벽과 전환비용, 대안매력에 유의한 결과를 보이는 것으로 나타났다. 그리고 지각된 가격은 전환장벽에 유의한 영향을 미치는 것으로 나타났다. 둘째, 전환장벽, 전환비용, 대안매력은 관계성과 즉, 전환의도와 비재무적성과에 유의한 영향을 미치는 것으로 나타났다. 셋째, 종사자서비스, 브랜드 네임, 이미지일치성은 전환의도 및 비재무적성과에 유의한 결과를 보이고 있는 것으로 밝혀졌다.

• 영어영문학
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• 제57권4호
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• pp.529-552
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• 2011

My essay aims at reading Ginsberg's "Howl" and "Kaddish" with the concept of 'shaman-prophet-poet' to illustrate the dynamic relationship between his poetics and radical politics. Throughout his widely-ranging career, Ginsberg represents himself as a poet-prophet and commands a typical rhetoric of revelation as a way of decentering Cold War orthodoxies. While well aware of the oppressive and pervasive power of the dominant post-war ideologies, he adopts 'madness' to oppose conventional political, social, and religious institutions; by way of entering into the madness of this world and actively engaging himself as a victim, he can finally heal both himself and the world. This dual function of poet characterizes his rhetoric of revelation, but it doesn't appeal to the mainstream of American critical ideology where the post-structural approach to language and subject gives a skeptical look at any account of active human agency and humanistic belief in the possibility of language. In "Howl" and "Kaddish," Ginsburg persuades the reader of the truth of his own vision through the convincing and realistic portraits of his contemporaries as well as his own mother and family. Different from his visionary predecessors such as Emerson and Whitman, Ginsberg knew the difficulty of a negotiation between history and divine vision, and attempted to imbricate his family, friends, and even the larger social and political units within his visionary experience in order to avoid naive idealism, escapism, or solipsism. Furthermore, he deconstructs the Logos of Western prophecy and replaces it with the groundless identity and the nontheistic epistemology of Buddhism, which, in turn, leads to emptying his powerful language of absolutist meaning and prevents his prophecy from becoming re-reified as divine essentialism. Ginsberg's idea of poet and poem revitalizes the skeptical view on language and literary representation of our contemporary critical community which is unwilling to engage the experimental scope of his radical prophecy.