• Title/Summary/Keyword: Distribution Tool

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Experimental Study of the Redistribution of Welding Distortion According to the Partial Removal of Welded Structure (용접구조물의 부분 제거에 따른 용접변형의 재분포에 관한 실험적 연구)

  • Kim, Yong Rae;Wang, Chao;Kim, Jae Woong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.7
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    • pp.707-712
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    • 2015
  • During the welding process, welding distortion is caused by the non-uniformity of the temperature distribution in the weldment. Welding distortion is redistributed because the residual stress and rigidity change according to the removal of the welded structure. In shipbuilding in particular, this phenomenon may be observed during the cutting process of lugs that are attached to blocks for transfer. The redistribution of welding distortion also causes problems, such as damage to the cutting tool. The aim of this study is to experimentally analyze the redistribution of welding distortion because of the partial removal of the welded structure. In the experiments conducted in this study, fillet welding and cutting were performed, and longitudinal bending and angular distortion in the welded structures were then investigated and analyzed.

Field Applicability of Augmented Reality Technology by Marker Mapping for Construction Project (Focused on Measurement Process of Rebar Work) (마커방식 증강현실기법의 건설현장 적용성 연구 (철근배근 검측업무 사례적용))

  • Kim, SunYoung;Kim, HyeonSeung;Moon, HyounSeok;Kang, LeenSeok
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.33 no.6
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    • pp.2509-2518
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    • 2013
  • Augmented reality (AR) technology visualizes a real type object that cannot simulate in virtual reality technology by overlapping a virtual object and real object in a computer system. This study suggests a methodology and prototype system for applying AR system to rebar distribution work in a civil engineering project. Rebar work in civil engineering project is a representative activity that is progressed by empirical approach of skilled labor rather than formalized manual. AR technology improves the constructability of rebar work because AR tool can identify missing rebars and different rebars comparing with the drawings. AR system developed in this study can enhance the understanding of rebar work using 3D modeling with real image of construction site and save construction cost by reducing reconstruction work.

Crosswind effects on high-sided road vehicles with and without movement

  • Wang, Bin;Xu, You-Lin;Zhu, Le-Dong;Li, Yong-Le
    • Wind and Structures
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    • v.18 no.2
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    • pp.155-180
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    • 2014
  • The safety of road vehicles on the ground in crosswind has been investigated for many years. One of the most important fundamentals in the safety analysis is aerodynamic characteristics of a vehicle in crosswind. The most common way to study the aerodynamic characteristics of a vehicle in crosswind is wind tunnel tests to measure the aerodynamic coefficients and/or pressure coefficients of the vehicle. Due to the complexity of wind tunnel test equipment and procedure, the features of flow field around the vehicle are seldom explored in a wind tunnel, particularly for the vehicle moving on the ground. As a complementary to wind tunnel tests, the numerical method using computational fluid dynamics (CFD) can be employed as an effective tool to explore the aerodynamic characteristics of as well as flow features around the vehicle. This study explores crosswind effects on a high-sided lorry on the ground with and without movement through CFD simulations together with wind tunnel tests. Firstly, the aerodynamic forces on a stationary lorry model are measured in a wind tunnel, and the results are compared with the previous measurement results. The CFD with unsteady RANS method is then employed to simulate wind flow around and wind pressures on the stationary lorry. The numerical aerodynamic forces are compared with the wind tunnel test results. Furthermore, the same CFD method is extended to investigate the moving vehicle on the ground in crosswind. The results show that the CFD results match with wind tunnel test results and the current way using aerodynamic coefficients from a stationary vehicle in crosswind is acceptable. The CFD simulation can provide more insights on flow field and pressure distribution which are difficult to be obtained by wind tunnel tests.

Landscape Function and Tourism Industry: A Case Study of Moc Chau Plateau, Vietnam

  • LE, Hoa Thi Thu;TONG, Binh Thanh;VU, Ngoc Thi Minh;HO, Luu Si;PHAM, Thang Viet;TRINH, Hang Thi Thu
    • The Journal of Asian Finance, Economics and Business
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    • v.7 no.12
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    • pp.1195-1204
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    • 2020
  • Tourism is not only a cultural service but also a resource consuming industry. Landscape function framework is a powerful tool to show the relationship between nature and people. This study collects 50 documents around the world to analyze the relationship between the 4 functional groups of the landscape (regulatory functions, production and supply functions, resident functions, information and entertainment functions) and the tourism industry. On that basis, we created an establishment for practical contact analysis of the goods and services of the landscape for tourism development in Moc Chau plateau, Vietnam. Research results show that tourism is an economic sector that benefits from the landscape and has a clear resource orientation. Moc Chau plateau has rich tourism resources and has the conditions to develop various types of tourism, especially cultural tourism based on community and resort tourism. The two cultural functions and the providing functions are the two most important functional groups for the tourism development of Moc Chau district, bringing the two most important tourism icons for Moc Chau, a green steppe, cool milk benevolent and also a district rich in national culture. From these conclusions, the authors give recommendations and notable points about landscapes in the tourism industry, especially in places with topography like Moc Chau.

The Effects of the Marketing Communication and the Trust on Long-Term Relationship Orientation in the B2B Industrial Product Market (B2B 산업재 시장에서 마케팅 커뮤니케이션 요인과 신뢰가 장기거래지향성에 미치는 영향)

  • Oh, Sei-Kyung;Han, Kyung-Il
    • Journal of Digital Convergence
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    • v.10 no.8
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    • pp.81-90
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    • 2012
  • This study is to establish the effects on B2B(Business-to-Business) industrial product market of the Marketing Communication which used in B2C(Business-to-Customer) has influences on Trust and Trust has influences on Long-Term Orientation through survey targeting 177 wholesale and retail dealers of Air-Tool distribution. Accordance with these conclusions, The Trust that the customer felt for Supplier was a positive influence on Long-Term Orientation. Also advertising of marketing communication is useful for increasing the Trust. Thus, to increase Long-Term Orientation on B2B, supplier needs to increase Trust and to find another marketing communication factors increased Trust is needed.

Design and Fabrication of Microstrip Patch Antenna with T-shaped Slits for GPS (T형 슬릿을 갖는 GPS 수신용 마이크로스트립 패치 안테나 설계 및 제작)

  • Lee Eun-Jin;Lee Kwoun-Ig;Kim Heung-Soo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.5 s.347
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    • pp.169-175
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    • 2006
  • In this paper, a microstrip patch antenna with the T-shaped slits is designed and fabricated for GPS. The resonant frequency of the microstrip patch antenna with the slits is lower than that of a microstrip patch antenna without the slits so it can be reduced the size of patch. In order to calculate resonant frequency of the microstrip patch antenna with the slits, the resonant frequency formulas are derived from the surface current distribution on microstrip patch antenna. Using the Ensemble 6.0 simulation tool, the accuracy of approximate equations is verified. The microstrip patch antenna with the slits is designed by using these equations. The size of the designed antenna with T-shaped slits can be reduced to 29% compared with that without the slits. The microstrip patch antenna with slits have a very narrow bandwidth. In order to improve the narrow bandwidth of microstrip patch antennas with the slits, a microstrip patch antenna with rectangular slot is proposed. As the result of the measurements, the resonant frequency of the proposed microstrip patch antenna with the T-shaped slits is 1.575GHz and the bandwidth is about 50MHz.

Assessment of Cellular Proliferation in Oral Verrucous Carcinoma and Well-Differentiated Oral Squamous Cell Carcinoma Using Ki67: A Non-Reliable Factor for Differential Diagnosis?

  • Zargaran, Massoumeh;Eshghyar, Nosratollah;Baghaei, Fahimeh;Moghimbeigi, Abbas
    • Asian Pacific Journal of Cancer Prevention
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    • v.13 no.11
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    • pp.5811-5815
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    • 2012
  • Background: Non-invasive oral verrucous carcinoma (OVC) and invasive well-differentiated oral squamous cell carcinoma (OSCC) have similar histopathologic findings but different biological behavior. These two malignancies must be correctly differentiated by pathologists. The aim of this study was to determine immunohistochemical (IHC) expression of Ki67 in OVC and well-differentiated OSCC. Methods: Expression of Ki67 was evaluated by IHC in 15 cases of epithelial hyperplasia with no dysplasia (A group), 15 cases of OVC (B group), 12 cases of microinvasive OSCC(C group) and 15 cases of well-differentiated OSCC (D group). Results: There was a significant difference in Ki67 expression based on pattern distribution of immunostaining positive cells, with quantitative and semi-quantitative analyses, among the four groups ; also, between A group and each of the other three groups (P=0.0001). But there was no significant difference between B and C, C and D, and B and D groups (P>0.05). Conclusions: The three evaluation methods of Ki67 expression showed Ki67 (Mib-1) is not a good immunohistochemical marker to assess invasion status and differentiate OVC from well-differentiated OSCC; also, it cannot be used as a diagnostic tool to distinguish between variants of OSCC with similar grade.

Fatty Acid Methyl Ester (FAME) Technology for Diagnosing Nocardia Foaming in Activated Sludge (활성슬러지내 Nocardia 거품현상 진단을 위한 Fatty Acid Methyl Ester (FAME) 기술)

  • Lee, Jae Woo;Kim, Il Kyu;Lee, Seok Hun;Ahn, Kyu-Hong;Cha, Daniel K.
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.4
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    • pp.480-485
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    • 2004
  • Fatty acid methyl ester (FAME) technology was evaluated as a monitoring tool for quantification of Nocardia amarae causing a nuisance foaming problem in activated sludge process. The identified signature peak was 19:1 alcohol as a reliable unique peak to N. amarae. Chemostat study revealed that the distribution and quantity of fatty acid peaks were dependent on the growth stage of Nocardia. The FAME results were similar for two relatively high dilution rates; however, the amounts of signature peaks extracted from the 4 and 6 day cultures were significantly higher. This dependence of signature peaks on the physiological state of the organism may be a useful information to assess the health of microbial populations in activated sludge. A laboratory scale batch foaming potential experiment provided a critical foaming level depending on Nocardia population. This critical Nocardia level determined in this study was in terms of either the threshold filament intersections number or the threshold signature FAME amount. The threshold peak area of signature FAME (19:1 alcohol) and corresponding filament counts were 430PA/mg VSS and $1.45{\times}10^6$ intersections/g VSS, respectively. The threshold signature FAME level could be effectively applied as a criterion for diagnosing foam occurrence in activated sludge system.

A Study on the Productivity Improvement of the Dicing Blade Production Process (다이싱 블레이드 제조공정의 생산성향상에 관한 연구)

  • Mun, Jung-Su;Park, Soo-Yong;Lee, Dong-Hyung
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.39 no.3
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    • pp.147-155
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    • 2016
  • Industry 4.0's goal is the 'Smart Factory' that integrates and controls production process, procurement, distribution and service based on the fundamental technology such as internet of the things, cyber physical system, sensor, etc. Basic requirement for successful promotion of this Industry 4.0 is the large supply of semiconductor. However, company I who produces dicing blades has difficulty to meet the increasing demand and has hard time to increase revenue because its raw material includes high price diamond, and requires very complex and sensitive process for production. Therefore, this study is focused on understanding the problems and presenting optimal plan to increase productivity of dicing blade manufacturing processes. We carried out a study as follows to accomplish the above purposes. First, previous researches were investigated. Second, the bottlenecks in manufacturing processes were identified using simulation tool (Arena 14.3). Third, we calculate investment amount according to added equipments purchase and perform economic analysis according to cost and sales increase. Finally, we derive optimum plan for productivity improvement and analyze its expected effect. To summarize these results as follows : First, daily average blade production volume can be increased two times from 60 ea. to 120 ea. by performing mixing job in the day before. Second, work flow can be smoother due to reduced waiting time if more machines are added to improve setting process. It was found that average waiting time of 23 minutes can be reduced to around 9 minutes from current process. Third, it was found through simulation that the whole processing line can compose smoother production line by performing mixing process in advance, and add setting and sintering machines. In the course of this study, it was found that adding more machines to reduce waiting time is not the best alternative.

Comparison of Depth Profiles of CIGS Thin Film by Micro-Raman and XPS (마이크로 라만 및 XPS를 이용한 CIGS 박막의 두께방향 상분석 비교)

  • Beak, Gun Yeol;Jeon, Chan-Wook
    • Current Photovoltaic Research
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    • v.4 no.1
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    • pp.21-24
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    • 2016
  • Chalcopyrite based (CIGS) thin films have considered to be a promising candidates for industrial applications. The growth of quality CIGS thin films without secondary phases is very important for further efficiency improvements. But, the identification of complex secondary phases present in the entire film is crucial issue due to the lack of powerful characterization tools. Even though X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and normal Raman spectroscopy provide the information about the secondary phases, they provide insufficient information because of their resolution problem and complexity in analyzation. Among the above tools, a normal Raman spectroscopy is better for analysis of secondary phases. However, Raman signal provide the information in 300 nm depth of film even the thickness of film is > $1{\mu}m$. For this reason, the information from Raman spectroscopy can't represent the properties of whole film. In this regard, the authors introduce a new way for identification of secondary phases in CIGS film using depth Raman analysis. The CIGS thin films were prepared using DC-sputtering followed by selenization process in 10 min time under $1{\times}10^{-3}torr$ pressure. As-prepared films were polished using a dimple grinder which expanded the $2{\mu}m$ thick films into about 1mm that is more than enough to resolve the depth distribution. Raman analysis indicated that the CIGS film showed different secondary phases such as, $CuIn_3Se_5$, $CuInSe_2$, InSe and CuSe, presented in different depths of the film whereas XPS gave complex information about the phases. Therefore, the present work emphasized that the Raman depth profile tool is more efficient for identification of secondary phases in CIGS thin film.