• Title/Summary/Keyword: field projection method

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The Clinical Usefulness of Spiral CT Angiography in the Diagnosis of Pulmonary Thromboembolism (폐색전증 진단에서 나선식 전산화 단층촬영 혈관조영술의 임상적 유용성)

  • Kim, Woo-Gyu;Lim, Byung-Sung;Kim, Mi-Young;Hwang, Hweung-Kon
    • Tuberculosis and Respiratory Diseases
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    • v.47 no.5
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    • pp.669-680
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    • 1999
  • Background: Pulmonary thromboembolism(PTE) is a life threatening disease that needs early diagnosis. Spiral CT angiography depict thromboemboli in the central pulmonary vessels with greater than 90% sensitivity and specificity, which approaches the results of pulmonary angiography in the Prospective Investigation of Pulmonary Embolism Diagnosis(PIOPED) study. This study was performed to evaluate the findings and the diagnostic value(clinical utility) of the spiral CT angiography with 2D image(multiplanar reformation) and 3D images(Shaded surface display, Minimal intensity projection) in the pulmonary thromboembolism. Methods: We retrospectively analysed spiral CT angiography and pulmonary angiography, lung scan and clinical recordings of 20 patients who had PTE diagnosed by spiral CT angiography(n=19 cases) or pulmonary angiography(n=l case) from September 1997 to August 1998. Among 20 patients who had underwent spiral CT angiography, 14 patients could be performed lung perfusion scan at the same time. We analyzed the vascular and parenchymal change in spiral CT angiogram. Results: Anatomical distribution of PTE was as follows: 1) left lung(n= 103)

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Effectiveness of "Village Image Construction Tool Kit" in the Residents Workshop of a Housing Improvement Area (주거지 정비지역 주민 워크샵을 통한 마을이미지 맵 제작도구의 효용성 연구)

  • Lee, Yeun-Sook;Kim, Ju-Suck;Jung, Eun-Jung
    • Journal of the Korean housing association
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    • v.21 no.1
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    • pp.67-77
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    • 2010
  • Citizen participation in local redevelopment has recently been regarded as essential, since progress in democracy and diversified public interests have contributed to more importance being placed on citizen participation in the implementation of public policies. While the importance of resident participation has been increasingly emphasized in principle, in reality more effort is still required in its application. We need to develop practical strategies of collecting community opinion in order to reflect it in public policy, if we are to achieve a resident and citizen-centered society. The purpose of this study is to develop an image map construction tool that can be applied to the "Maul-Mandulgi" projects as a visualized method to facilitate the exchange of opinions and work toward agreements. The tool is intended to assist public discussion by visualizing policies and plans and reducing the possibility of misunderstanding, so that residents can properly respond to the plans. Second, this study will verify the effectiveness of the tool in the application to local community workshops. The main research method is participant observation method and field study. Major findings are as follows, First, every resident who had participated in previous workshops gathered together, used the tool and represented their opinions unusually more than once. Each resident tried to make sure that other participants appropriately understood his or her opinion. The workshop finished when all participants agreed and produced a consensus. The workshop took much less time, which is in stark contrast to previous workshops in which it took significantly more time to collect opinions. Second, it proved that residents in the redevelopment area can strike a broad agreement by themselves on a method and direction for residential improvement. In previous workshops, conflicts between residents developed over the choice between the two methods, of local improvement and total demolition prior to multi-housing construction. In this study, opinions of residents were not limited to the two methods by finding a winwin solution. Third, the use of the tool kit for image map became efficient for inactive residents to develop their own opinions in regard to the direction and orientations of the residential improvement process. In addition, for those who have either no or a slight understanding of the residential improvement projects, the tool can provide access to information and knowledge. This study concludes that the developed tool for imaging of the redevelopment projection like a design game, rather than using forms of text and speech, can be a useful tool in collecting opinions and forming an agreed opinion for forthcoming residential improvement plans.

Reconstruction Of Photo-Realistic 3D Assets For Actual Objects Combining Photogrammetry And Computer Graphics (사진측량과 컴퓨터 그래픽의 결합을 통한 실제 물체의 사실적인 3D 에셋 재건)

  • Yan, Yong
    • The Journal of the Korea Contents Association
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    • v.21 no.1
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    • pp.147-161
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    • 2021
  • Through photogrammetry techniques, what current researches can achieve at present is rough 3D mesh and color map of objects, rather than usable photo-realistic 3D assets. This research aims to propose a new method to create photo-realistic 3D assets that can be used in the field of visualization applications. The new method combines photogrammetry with computer graphics modeling. Through the description of the production process of three objects in the real world - "Bullet Box", "Gun" and "Metal Beverage Bottle," it introduces in details the concept, functions, operating skills and software packages used in the steps including the photograph object, white balance, reconstruction, cleanup reconstruction, retopology, UV unwrapping, projection, texture baking, De-Lighting and Create Material Maps. In order to increase the flexibility of the method, alternatives to the software packages are also recommended for each step. In this research, 3D assets are produced that are accurate in shape, correct in color, easy to render and can be physically interacted with dynamic lighting in texture. The new method can obtain more realistic visual effects at a faster speed. It does not require large-scale teams, expensive equipment and software packages, therefore it is suitable for small studios and independent artists and educational institutions.

A Study on the Projected Workforce for Public Health Nurses in Korea (보건간호사 인력수요 추계에 관한 연구)

  • Han, Suk-Jung;Oh, Pok-Ja
    • Research in Community and Public Health Nursing
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    • v.13 no.4
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    • pp.757-766
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    • 2002
  • Purpose: Recently there have been many changes in health care environments in Korea. To perform public health programs effectively and efficiently, it is necessary to analyze and identify the demand and supply for the public health nurses. Method: The study analyzed experts' opinions regarding the supply of public health nurses, as well as national and foreign statistical data on workforce supply of public health nurses. Two methods for estimating the amount of demand for public health nurses were used: one was applying the indicators of developed countries for public health nurses based on population: the other was to refer to regulations and/or recommended guidelines in Korea. Result: 1) The number of public health centers, public health sub-centers, and primary health care posts have decreased between 1990 and 2001, from 260 to 242, 1318 to 1270, 2038 to 1907, respectively. 2) Between 1997 and 2002, the number of public health nurses has also decreased from 5572 to 5112. 3) In the case of applying regulations, the number (5112) of existing public health nurses falls shortly by 942. 4) In 2001, the Korean population per one public health nurse was 9262. 5) In the case of applying regulations, the number of public health nurses required to meet the demand for health services in 2001 and 2020 is estimated at 5932 and 6347, respectively. 6) In the case of applying the indicators of developed countries, the number of public health nurses required to meet the demand for health service in 2001 and 2020 is estimated at 9.469 and 10.310, respectively. Conclusion and suggestions: Because of the importance of public health industry, public health nurses have been approved as a field specialist and specialized nurse practitioner by the newly revised legal regulation, there have been absence of approval of their role differentiation and capability. In addition, organizational activity and insufficient number of the public health nurses have contributed to the inactive utilization of them. As community public health is focused on caring individuals as well as organizations, it requires more autonomy and special skills than other fields. Therefore, public health nurses need to enhance the capability as health educator, consultant, and information management persons through advanced education course for public health nurses. Public health nurses need to be prepared as advanced nurse practitioners by receiving advanced education courses and field experiences.

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A Study on the Failure Cause of Large Scale Rock Slope in Limestone Quarries (석회석 광산에서 발생한 대규모 암반사면의 붕괴원인 분석에 관한 연구)

  • Lee, Sang-Eun;Kim, Hak-Sung;Jang, Yoon-Ho
    • Tunnel and Underground Space
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    • v.24 no.4
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    • pp.255-274
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    • 2014
  • The target of this study is large scale rock slope collapsed by around 7 pm on August, 2012, which is located at ${\bigcirc}{\bigcirc}$ limestone quarries of Gangneung city, Gangwondo. The slope prior to the collapse is formed as the height of about 200 m and the average inclination of $45^{\circ}$. The estimated amount of the collapse is about $1,500,000m^3$ with respect to the slope after the collapse. Geotechnical and field investigations such as boring, geophysical prospecting, surface geological survey, geological lineaments, borehole imaging, metric 3D imaging, experimental and field test, mining work by year, and daily rainfall were performed to find the cause of rock slope failure. Various analyzes using slope mass rating, stereonet projection, limit equilibrium method, continuum and non-continuum model were conducted to check of the stability of the slope. It is expected that the cause of slope failure from the results of various analysis and survey is due to the combined factors such as topography, rainfall, rock type and quality, discontinuities, geo-structural characteristics as the limestone cavity and fault zones, but the failure of slope in case of the analysis without the limestone cavity is not occurred. Safe factor of 0.66 was obtained from continuum analysis of the slope considering the limestone cavity, so the ultimate causes of slope failure is considered to be due to the influence of limestone cavity developed along fault zone.

3-Dimensional Tunnel Analyses for the Prediction of Fault Zones (파쇄대 예측을 위한 터널의 3차원 수치해석)

  • 이인모;김돈희;이석원;박영진;안형준
    • Journal of the Korean Geotechnical Society
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    • v.15 no.4
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    • pp.99-112
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    • 1999
  • When there exists a fault zone ahead of the tunnel face and a tunnel is excavated without perceiving its existence, it will cause stress concentration in the region between the tunnel face and the fault zone because of the influence of the fault zone on the arching phenomena. Because the underground structure has many unreliable factors in the design stage, the prediction of a fault zone ahead of the tunnel face by monitoring plans during tunnel construction and the rapid establishment of appropriate support system are required for more economical and safer tunnel construction. Recent study shows that longitudinal displacement changes during excavation due to the change of rock property, and if longitudinal displacement and settlement, which are measured in the field, are considered together in displacement analysis, the prediction of change in rock mass property is possible. This study provided the method for the prediction of fault zones by analyzing the changes of L/C and (Ll-Lr)/C ratio (L= longitudinal displacement at crown, C = settlement at crown, Ll = longitudinal displacement at left sidewall, Lr = longitudinal displacement at right sidewall) and the stereographic projection of displacement vectors which were obtained from the 3-D numerical analysis of hybrid method in various initial stress conditions.

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Double-Gauss Optical System Design with Fixed Magnification and Image Surface Independent of Object Distance (물체거리가 변하여도 배율과 상면이 고정되는 이중 가우스 광학계의 설계)

  • Ryu, Jae Myung;Ryu, Chang Ho;Kim, Kang Min;Kim, Byoung Young;Ju, Yun Jae;Jo, Jae Heung
    • Korean Journal of Optics and Photonics
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    • v.29 no.1
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    • pp.19-27
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    • 2018
  • A change in object distance would generally change the magnification of an optical system. In this paper, we have proposed and designed a double-Gauss optical system with a fixed magnification and image surface regardless of any change in object distance, according to moving the lens groups a little bit to the front and rear of the stop, independently parallel to the direction of the optical axis. By maintaining a constant size of image formation in spite of various object-distance changes in a projection system such as a head-up display (HUD) or head-mounted display (HMD), we can prevent the field of view from changing while focusing in an HUD or HMD. Also, to check precisely the state of the wiring that connects semiconductor chips and IC circuit boards, we can keep the magnification of the optical system constant, even when the object distance changes due to vertical movement along the optical axis of a testing device. Additionally, if we use this double-Gauss optical system as a vision system in the testing process of lots of electronic boards in a manufacturing system, since we can systematically eliminate additional image processing for visual enhancement of image quality, we can dramatically reduce the testing time for a fast test process. Also, the Gaussian bracket method was used to find the moving distance of each group, to achieve the desired specifications and fix magnification and image surface simultaneously. After the initial design, the optimization of the optical system was performed using the Synopsys optical design software.

Field Investigation and Stability Analysis of a Volcanic Rock Slope at the Song-Gok site, Wan-Do (완도 송곡지구 화산암류 비탈면의 현장조사 및 안정성 검토 사례 연구)

  • Kim, Hong-Gyun;Ok, Young-Seok;Kim, Seung-Hyun;Koo, Ho-Bon
    • The Journal of Engineering Geology
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    • v.23 no.2
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    • pp.149-160
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    • 2013
  • Volcanic activity commonly creates a highly complicated volcanic complex due to the admixture of lava flow and sedimentation of volcanic ash. The Song-Gok site is composed of volcanic rocks that collapsed at the lower part of the slope, in combination with several discontinuities in and around a fault. The results of projection analysis indicated the possibility of plane, wedge, and toppling failure in the failure section. The results of discontinuity modeling using the Distinct Element Method (DEM) revealed a total displacement of 207 mm and a joint shear displacement of 114 mm. The yield surface zone was verified at the fault plane of the failure section. In geotechnical terms, volcanic rock slopes are characteristically vulnerable to failure because of differential weathering among the various rock types, the effect of groundwater based on the permeability of the rocks, and the presence of systematic joints generated by the cooling and contraction of lava. When considering the stability of a volcanic rock slope, it is necessary to consider data such as the geological features of the rock, as obtained through detailed geological survey, and variations in discontinuities and rock blocks.

KrF 엑시머 레이저를 이용한 웨이퍼 스텝퍼의 제작 및 성능분석

  • 이종현;최부연;김도훈;장원익;이용일;이진효
    • Korean Journal of Optics and Photonics
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    • v.4 no.1
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    • pp.15-21
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    • 1993
  • This paper describes the design and development of a KrF excimer laser stepper and discusses the detailed system parameters and characterization data obtained from the performance test. We have developed a deep UV step-and-repeat system, operating at 248 nm, by retrofitting a commercial modules such as KrF excimer laser, precision wafer stage and fused silica illumination and 5X projection optics of numerical aperture 0.42. What we have developed, to the basic structure, are wafer alignment optics, reticle alignment system, autofocusing/leveling mechanisms and environment chamber. Finally, all these subsystem were integrated under the control of microprocessor-based controllers and computer. The wafer alignment system comprises the OFF-AXIS and the TTL alignment. The OFF-AXIS alignment system was realized with two kinds of optics. One is the magnification system with the image processing technique and the other is He-Ne laser diffraction type system using the alignment grating on the wafer. 'The TTL alignment system employs a dual beam inteferometric method, which takes advantages of higher diffraction efficiency compared with other TTL type alignment systems. As the results, alignment accuracy for OFF-AXIS and TTL alignment system were obtained within 0.1 $\mu\textrm{m}$/ 3 $\sigma$ for the various substrate on the wafers. The wafer focusing and leveling system is modified version of the conventional systems using position sensitive detectors (PSD). This type of detection method showed focusing and leveling accuracies of about $\pm$ 0.1 $\mu\textrm{m}$ and $\pm$ 0.5 arcsec, respectively. From the CD measurement, we obtained 0.4 $\mu\textrm{m}$ resolution features over the full field with routine use, and 0.3 $\mu\textrm{m}$ resolution was attainable under more strict conditions.

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Analysis of comic 'Monster' based on J. Lacan's psychoanalytic theory - Focused on desire theory - (자끄 라깡의 정신분석 이론으로 본 만화 '몬스터' 분석 - 욕망이론을 중심으로 -)

  • Park, Hye Ri
    • Cartoon and Animation Studies
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    • s.50
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    • pp.153-185
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    • 2018
  • This study analyzed the comic "Monster" based on J. Lacan's psychoanalytic theory. J. Lacan advocated a new psychoanalytic theory through S. Freud's psychoanalytic theories and socio-cultural studies. The main theory of his theoretical background is the 'desire theory' which analyzed human desires. He distinguished human desires as desires and demands and had the basic proposition that 'human desire is the desire of the other'. J. Lacan (J. Lacan) studied in depth the relationship between oneself and others, which he defined by dividing it into an imaginary system (mirror stage), a symbolic system (Oedipus complex), and a real system (desiring subject). Based on these theories, the main purpose of this study is to analyze the comic "Monster" by Naoki Urasawa focused on the desire theory of J. Lacan based on psychoanalysis to examine what new meaning could be extracted. In order to analyze the comic "Monster", the qualitative research method was used and the method of analysis was the descriptive phenomenological method devised by Giorgi (1985). Through this analytical method, the background, characters, and symbols of "Monster" were analyzed and content analysis was performed based on the theory of Giorgi (1985) and the desire theory of J. Lacan As a result of the analysis of the meaning unit and components related to the desire theory through content analysis, the contents analysis was divided into four components: identification, reproduction of desire, alienation, and unique desire and freedom. The results of this study are summarized as follows. First, on the basis of psychoanalysis, "Monster" is classified into four elements, identification of twin characters, reproduction of desire, feeling of alienation and unique desire and freedom of characters based on desire theory of J. Lacan. Second, the characters analyzed by the desire theory of J. Lacan attempted to reproduce their desires through identification and projection of twins due to their traumatic experience when they were young. Also, the characters who felt alienated in the process of reproduction made a tragic ending to complete human desire and freedom to fill in their emptiness. This result shows that desire theory of J. Lacan based on psychoanalysis can be used as a new analytical theory, a comic analysis which suggested a new meaning. The results of this study suggest that a new field of research, a comic analysis using psychological theory, needs to be created and further studies in this field are required.