• 한국해양공학회지
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• 제28권2호
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• pp.160-166
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• 2014

Because of industrial development, industrial facilities are becoming more complex and diversified. Plant industries are focused on productivity improvement, cost reduction, and product uniformity by simplifying production processes using automated control. Furthermore, plant industries require higher pressures and temperatures to improve energy efficiency. For this reason, the valves used in plants are operated under harsh conditions. Globe valves and gate valves are mainly used for high pressure these days. However, these valves have various problems, including low maintainability and high cost, due to structural problems. Therefore, butterfly and ball valve applications are increasing in industrial plants. This paper suggests a quadruple-offset butterfly valve that is applicable to bi-direction use, and the principle design parameters are suggested. The selected design parameters are an eccentric flange center line and shaft centerline(Offset 1), an eccentric seat centerline and disc shaft centerline(Offset 2), the angle between the flange centerline and seat wedge angle(Offset 3), the angle between the vertical direction of the disc shaft centerline and seat centerline(Offset 4), and the seat engagement angle. To analyze the interaction effect of the design parameters, ANOM and ANOVA were performed with an orthogonal array. The parameters were found to have effects in the following order: Offset 2, Offset 1, engagement angle, Offset 3, and Offset 4. The interaction between the parameters was insignificant.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2000년도 춘계종합학술대회
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• pp.93-97
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• 2000

최근 주요 선진국 및 표준화 기구들은 급변하는 시장의 요구 및 기술변화를 수용하기 위해 더 많은 새롭고 복잡한 표준들을 보다 짧은 시간 내에 개발하여, 표준화를 통한 동 분야의 경쟁력강화는 물론 이를 시장선점용 전략수단으로 활용하고 있으며, 이를 효과적으로 실현하기 위해 전자적 (표준) 문서 처리시스템(EDH: Electronic Document Handling) 혹은 표준정보유통시스템 개발에 박차를 가하고 있다. 본 논문에서는 이러한 정보통신분야의 환경변화에 효율적으로 대처하기 위해 국내 환경을 고려한 전자적 표준개발환경의 기본 시스템 구성과 이를 지원하기 위한 XML기반 표준 정보 공유 및 교환을 가능하게 하는 차세대 표준 정보 유통망의 구조, 그리고 표준화관련 종합정보의 One-stop Service 통한 표준화 로드맵 역할을 포함하는 차세대 표준정보유통망기능 중 정보서버역할을 하는 표준화전용 보털 사이트(Standardization Vortal Site) 구축 프레임워크를 제시한다.

• 한국주거학회논문집
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• 제21권1호
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• pp.79-88
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• 2010

The purpose of this study is to examine the design characteristic about the public space of privately-built apartment housing after the enforcement of price deregulation in Daegu. The public space of the multi-family housing is monotonous and closed according to the position of an elevator and a stair hall by the 1990's. However, the housing has been gentrified since 2000 because of demands of residents and purpose for selling in lots. Thus, the recognition of the apartments has changed and this change has led to extend the living territory and magnify the role of the public space where help interact with neighbors. This study is based on the survey of thirty nine apartment complex. Also, by using an analysis derived from a precedent study, design elements in approach and interior space of apartment residents are comprehended. The characteristic of the porch is researched and divided according to a roof of porch, form as the door, material of roof, wall, the ceiling and floor. Interior space is analyzed by several elements; forms of core, forms, materials and lights of ceiling, materials of walls and floors, existence and nonexistence of windows, and extra interior components etc. As a result of the study, After the enforcement of price deregulation, the public space of apartments has had improved quality in materials and design and the community center for residents such as waiting rooms and spots facilities has appeared. However, the traffic line of interior space has been very intricate. Also, sports facilities and waiting areas are limited to some apartments.

• 한국의상디자인학회지
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• 제16권1호
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• pp.53-64
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• 2014

The main objective of this research was to understand the characteristics of printed geometric patterns through the statistical & qualitative analysis of fashion appeared in contemporary female collections 2011 S/S to 2013 A/W. Data collection of 294 was done through review of 'pr$\hat{e}$t-$\grave{a}$-porter Collections' of three major fashion cities; Paris, Milan and NY. Statistical analysis of frequency was conducted. Also qualitative interpretation of natural print design' characteristics were completed. The main findings were as followed; 1,636 of the total 15,852 designs were printed patterns in 12 Collections and the occurrence rate of printed geometric patterns in three collections were 8.6% in Milan, 9.2% in Paris and 12.9% in N.Y. Most geometric patterns were the types of compact or medium density in a front patterns with a variety of sizes and mainly applied to the one piece dress or two piece clothing item combination styles. Formative Characteristics of printed geometric patterns were classified into four types. First, a variety of thicknesses and shapes, such as a line or a rectangle shape to take advantage of the types of the typical geometric pattern. Second types were using the motifs which inspired by geometric shapes such as point, circle star and other special geometric shapes and arranging them regularly with various sizes and density. The third was repeated particular motifs which based on complex and sophisticated mathematical formulas. Fourth were the specific diagram types of bold and free shapes or dividing the flat and arranging them without rules, or the combination type of various geometric motifs.

• 대한소아치과학회지
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• 제43권2호
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• pp.192-199
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• 2016

유치열에서 드물게 관찰되는 삼중치는 세 치아의 비정상적인 융합으로 나타난다. 몇몇 문헌들에서 이중치에 대해 보고하고 있지만, 삼중치에 대한 보고는 매우 드물다. 이러한 다중치는 유치열에서 더 흔하게 관찰되며, 몇 가지 임상적 문제점을 나타낸다. 심미적인 문제 뿐만 아니라 치아 우식증 및 파절에 취약함, 영구 치배의 결손, 교정적, 치주적 문제를 야기할 수 있으며, 복잡한 치아 구조로 인해 치수 치료를 어렵게 한다. 첫 번째 증례는 만 1세 7개월 남아의 상악 유전치부에 나타난 삼중치로, 깊은 우식으로 치수 치료가 필요할 것으로 예상되었고, Mineral Trioxide Aggregate (MTA)를 이용하여 부분 치수 절단술을 시행하였다. 두 번째 증례는 만 1세 9개월 남아의 하악 유전치부에 나타난 삼중치로 파절을 주소로 내원하였다. 파절편 조각을 제거한 뒤, 잔존 치아에서 치수 절제술을 시행하였다. 각각 24개월, 6개월간의 정기 검진시까지 특별한 합병증은 나타나지 않았으며, 수복물 또한 비교적 양호하게 유지되었다.

• 한국전자파학회논문지
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• 제7권1호
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• pp.83-91
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• 1996

SPICE 회로 해석 프로그램은 수치계산에서 한계를 가지고 있으며 일반적으로 노드전압으로부터 S 파라미터를 계산하기 위한 복잡한 수식으로 인하여 RF나 Microwave회로의 시율레이션에서는 사용 할 수 없는 것으로 알려져 왔다, 회로해석에 의한 노드 전압과 전류로서도 S 파라미터를 쉽게 구할 수 있음을 보였으며 입사, 반사, 진행파와 비례하는 노드 전압을 구하기 위하여 사용되는 테스트 벤치를 개발하였다 SPICE의 계산된 노드전압으로부터 S-파라미터를 계산하고 PSPICE의 후처리 프로 세서인 PROBE를 사용하여 전송선로로 구성된 저역통과 필터를 예로써 제시한다. 시뮬레이션 결과는 또다른 고주파 회로해석 프로그램인 TOUCHSTONE으로 얻어진 결과와 비교하였다. 2가지 프로그 램의 해석 결과에서 크기(amplitude)는 0.003이하의 오차를 나타내었고 위상(phase)은 수십분의 1도 (degree)정도의 차이를 보였다. RF나 Microwave회로를 시뮬레이션하기 위하여 이러한 테스트 벤치를 사용하면 정확도는 물론 가격적으로 매우 저렴하고 교육에 필요한 도구로써 유용하고 실제의 기술자들에게도 효율적일 것이다.

• 천문학회보
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• 제42권2호
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• pp.80.1-80.1
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• 2017

We present preliminary results of KVN single dish telescope observations of 80 dense cores in the Orion molecular cloud complex which contains the Orion A, B, and ${\lambda}$ Orionis cloud. We investigate the behavior of the different molecular tracers and look for chemical variations of cores in the three clouds in order to systematically investigate the effects of stellar feedback. The most commonly detected molecular lines (with the detection rates higher than 50%) are N2H+, HCO+, H13CO+, C2H, HCN, and H2CO. The detection rates of dense gas tracers, N2H+, HCO+, H13CO+, and C2H show the lowest values in the ${\lambda}$ Orionis cloud. We find difference between molecular D/H ratios and N2H+/H13CO+ abundance ratios towards different clouds, and between protostellar cores and starless cores. Eight starless cores in the Orion A and B clouds exhibit high deuterium fractionations, larger than 0.10, while in the ${\lambda}$ Orionis cloud, no cores reveal the high ratio. These chemical properties could support that cores in the ${\lambda}$ Orionis cloud are affected by the photo-dissociation and external heating from the nearby H II region, which is a hint of negative stellar feedback on core formation. The striking difference between the [N2H+]/[H13CO+] ratios leads us to suggest that there are significant evolutionary differences between the Orion A/B and ${\lambda}$ Orionis clouds. In order to examine whether starless cores can be candidates of pre-stellar cores, we compared the core masses estimated from the 850 um emission to their Virial masses calculated from the N2H+ line data and find that most of them are not gravitationally bound in the three clouds.

• 천문학회보
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• 제42권2호
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• pp.43.3-43.3
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• 2017

NGC 6822 is a dwarf irregular galaxy in the Local Group and it is located in 500 kpc, further than the Large Magellanic Cloud and the Small Magellanic Cloud. Therefore, we can study star-forming processes by local condition in NGC 6822 instead of tidal force of the Galactic gravitational field. Hubble V is the brightest of several H II complexes in this galaxy. We observed Hubble V by using IGRINS attached on the 2.7 m telescope at the McDonald Observatory in Texas, US in May 2016. We performed a spectral mapping of $15^{{\prime}{\prime}}{\times} 7^{{\prime}{\prime}}$area on H and K bands, and detected emission lines of bright $Br{\gamma}\;{\lambda}2.1661{\mu}m$ and weak He I ${\lambda}2.0587{\mu}m$. Molecular hydrogen lines of 1-0S(1) ${\lambda}2.1218{\mu}m$, 2-1 S(1) ${\lambda}2.2477{\mu}m$, and 1-0 S(0) ${\lambda}2.2227{\mu}m$ was also detected. These emission lines show the structure of an ionized core and excited surface of clouds by far-ultraviolet photons, photodissociation region (PDR). We present three-dimensional maps of emission line distributions through multi slit scanning data and compare these results with the previous study. This presentation shows the physical structure of the star-forming regions and we discuss a PDR model and an evolution of Hubble V complex.

• 벤처창업연구
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• 제7권2호
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• pp.91-99
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• 2012

남북간 정치 군사적 갈등과 충돌로 인해 취해진 2008년 12.1조치와 2010년 5.24조치로 남북경협의 핵심 사업 중 남북한 철도 도로 연결과 금강산 관광사업이 중단되었고 개성공단 사업 역시 앞날이 불투명하다. 이 글에서는 남북관계 경색의 경제적 피해와 협력사업의 현황, 남북 현안 관련 국민의식을 살펴보고 향후 남북 기업 간 경제협력 방안에 대해 제시한다. 한반도의 경제외적 불안요인 최소화, 남북간 상생의 경제협력 추진, 남북경협에 선행되어야 할 완벽한 여건보장의 중요성, 국민적 합의에 기초한 남북관계 개선, 끝으로 남북 경제협력에서 미래지향적인 기업가적 관점에서의 신사업기회 모색의 필요성에 대해 논의하였다.

• 한국지역사회생활과학회지
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• 제24권2호
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• pp.251-258
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• 2013

Korean oil and honey Yukwa has been paid attention as formal cake for traditional national seasons' holiday and religious service. Quality of Yukwa, however, has been maintained arbitrarily by each Yukwa manufacturer. Since even same Yukwa had severe differences in size, weight, and pattern, it has given the negative effect to the consumer. Yukwa industries need to setup the quantitative quality specifications instead of qualitative ones to maintain the uniformity of Yukwa quality. Efficient and economical inspection and process control system should be developed. In developing quality standards of Yukwa, features which can measure quality quantitatively in real time should be properly chosen. Existing quality features such as acidity, oxidization, hardness, viscosity, and texture were measured by the chemical or physical base destructive methods. Many research and developments have been performed in investigating and analyzing chemical transition states of those quality features as environment or storage condition changes. Most methods, however, require either off-line or complex treatment or time consuming process of analysis in evaluating quality features. Consumer, however, selects products mostly based on the external features such as shape, size, and color. Therefore, critical visual quality features should be chosen and the efficient real time measurement system must be developed. In this paper, computer image acquisition and processing system were developed and software modules were developed to extract the quantitative data of those features in real-time. Computer image processing system will promote in maintaining uniform quality of Yukwa and establishing quality standards of Yukwa.