• Title/Summary/Keyword: Operating Experiences

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Methods of DICOM and Non-DICOM Interfacing for various Radiological Equipments with PACS (방사선 검사 관련 의료장비와 PACS 간의 연동을 위한 DICOM 및 Non-DICOM 인터페이스 방안)

  • Kim, Hyeon-Cheol
    • Korean Journal of Digital Imaging in Medicine
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    • v.5 no.1
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    • pp.46-63
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    • 2002
  • This thesis describes the effective interfacing methods of PACS Modality based on the system installation and operating experiences. PACS(Picture Archiving and Communication Systems) is a system for medical image archiving and communication using large storage device and high-speed network. The standard communication protocol of PACS is DICOM(Digital Imaging and Communication in Medicine) based on TCP/IP and point-to-point protocol. However, there are many Non-DICOM Modalities and DICOM Modalities having problems. First, we had interfaced almost modalities, Fuji CR, GE CT, MRI, Angio, Fluoro, Phillips Angio, Shimadzu Fluoro, Ultrasound PACS, with the main PACS in the Seoul S Hospital as large scale hospital. And we manipulated the intelligent image distribution and the CT, MRI Interfaces never experienced before in the Anyang J Hospital and the Chungju C Hospital as mid or small scale hospital. Technically, we developed both the DICOM Interface and the Non-DICOM Interface. At the last, the DICOM Worklist and the DICOM Print Interface were implemented in the Seoul B Hospital, the Bucheon SJ Hospital and the Seoul K Hospital independently with PACS. The Oracle, Sybase and MS-SQL are used as database, and UNIX, Macintosh, MS Windows as operating systems. And the Visual C++ and UNIX C are the main programming tools. We have used UTP, coaxial and fiber optic Gable under 10/100 mbps LAN for networking.

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A Scheme for the Load Shedding on Cheju Power Systems using Rate of Change of Frequency (주파수변화율을 이용한 제주계통 부하차단 방안)

  • Jang, B.T.;Lee, S.Y.;Cho, K.B.;Kwak, N.H.;Ahn, J.S.;Oh, H.J.;Cho, B.S.
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.184-186
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    • 2003
  • Power systems must be operated within limits that will ensure adequate generation and transmission capacity to avoid cascading. In developing a set of operations limits, it is important to do so within a general framework in order to ensure that the operating objectives are met. In the this regard, when the system experiences a generation-load imbalance, the principles of sound operation will be maintained by bringing under control an unscheduled power flow condition as quickly as possible. This paper presents load shedding application which responds both to frequency and to rate of change of frequency. Its application is in the operating situation of load suddenly in excess of generation, either because of generator or other equipment failure. A scheme which is able to utilize rate of change of frequency as well as frequency itself is an improvement over existing scheme.

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Exploring the Opening Process of New Entrusted Public Daycare Centers: Focusing on Sejong City (신도시 신규위탁 국공립어린이집의 개원과정 탐색: 세종시를 중심으로)

  • Lee, Sunghee;Kim, Youngmi
    • Korean Journal of Childcare and Education
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    • v.18 no.2
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    • pp.125-144
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    • 2022
  • Objective: The purpose of this study was to suggest institutional improvements and support measures for the opening process of new entrusted public daycare centers by exploring the experiences of the directors of daycare centers. Methods: In-depth interviews were held with nine directors of daycare centers in Sejong City. The recordings of the interviews were databased, and then the data were analyzed by categorizing the content. Results: First, the participants of this study were interested in the national/public daycare service consignment program and were eager to be selected for the program. They also had high expectations for operating daycare centers. Second, while preparing for the opening of the daycare center, the participants encountered problems after being selected for the program in terms of finance, facilities, equipment, and personnel management. Third, after opening the center, the participants went through the "survival period" as they had to overcome many issues while operating the center on their own. Conclusion/Implications: This study suggested financial and administrative improvements and support measures required for the consignment program so that daycare center directors can successfully and sustainably open and operate daycare centers.

'Jangseong Pyunbaek Healing Forest(JPHF)' Visitors: Socio-demographic Characteristics, Use Patterns and Motivational Factors by Types of Visitors ('장성 편백치유의 숲' 방문객 유형에 따른 인구사회학적 특성, 이용행태 및 방문동기 요인)

  • Kim, Sang-Oh;Kim, Sang-Mi
    • Korean Journal of Environment and Ecology
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    • v.32 no.2
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    • pp.203-214
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    • 2018
  • This study was conducted to investigate the types, socio-demographic characteristics, use patterns, and visit motivations of visitors to "Jangseong Pyunbaek Healing Forest (JPHF)." Data were collected from 216 samples selected by convenient sampling method using questionnaire survey between October and November 2016. Data obtained from 476 respondents of the same type of survey during the same period were partly used to examine the types of activities of visitors to the study site. The results showed that 77.0 percent of respondents were categorized as "visitor for recreation" (VR: Those who visit JPHF for the purpose of general recreational experiences such as appreciating landscapes, tourism, social interactions rather than better health or healing). On the other hand, only 10.3 percent of respondents were "visitor for healing" (VH: Those who visit JPHF for the purpose of better health or physical and mental healing). VH showed a higher level of visit experiences to JPHF than VR and tended to expect JPHF as "the place to enjoy calm and natural experiences" more than VR did. VH tended to visit JPHF "alone" more, and their group size was also smaller than VR. About 26.8 percent of all respondents were not aware that JPHF was the "healing forest," and VH showed higher awareness of it than VR. About 66.8% of respondents assessed the managerial and operating states of JPHF positively while only 6.2% assessed them negatively. There was no difference in the assessment of managerial and operating states between VR and VH. The visitors of JPHF showed the markedly high use in main forest roads (use rate: 47.4%) and "Healing Field" (use rate: 59.2%) of JPHF. Regarding the visit motivations to JPHF, VH showed higher importance on "quietude," "health," and "tension release" than VR while VR rated higher importance on "social interaction." The paper discussed the managerial implications, findings, limitations and further studies.

Four-Year Experience Using an Advanced Interdisciplinary Hybrid Operating Room : Potentials in Treatment of Cerebrovascular Disease

  • Jeon, Hong Jun;Lee, Jong Young;Cho, Byung-Moon;Yoon, Dae Young;Oh, Sae-Moon
    • Journal of Korean Neurosurgical Society
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    • v.62 no.1
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    • pp.35-45
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    • 2019
  • Objective : To describe our experiences with a fully equipped high-end digital subtraction angiography (DSA) system within a hybrid operating room (OR). Methods : A single-plane DSA system with 3-dimensional rotational angiography, cone-beam computed tomography (CBCT), and real-time navigation software was used in our hybrid OR. Between April 2014 and January 2018, 191 sessions of cerebrovascular procedures were performed in our hybrid OR. After the retrospective review of all cases, the procedures were categorized into three subcategorical procedures : combined endovascular and surgical procedure, complementary rescue procedure during intervention and surgery, and frameless stereotaxic operation. Results : Forty-nine of 191 procedures were performed using hybrid techniques. Four cases of blood blister aneurysms and a ruptured posterior inferior cerebellar artery aneurysm were treated using bypass surgery and endovascular trapping. Eight cases of ruptured aneurysm with intracranial hemorrhage (ICH) were treated by partial embolization and surgical clipping. Six cases of ruptured arteriovenous malformation with ICH were treated by Onyx embolization of nidus and subsequent surgical removal of nidus and ICH. Two (5.4%) of the 37 cases of pre-mature rupture during clipping were secured by endovascular coil embolization. In one (0.8%) complicated case of 103 intra-arterial thrombectomy procedures, emergency surgical embolectomy with bypass surgery was performed. In 27 cases of ICH, frameless stereotaxic hematoma aspiration was performed using $XperGuide^{(R)}$ system (Philips Medical Systems, Best, the Netherlands). All procedures were performed in single sessions without any procedural complications. Conclusion : Hybrid OR with a fully equipped DSA system could provide precise and safe treatment strategies for cerebrovascular diseases. Especially, we could suggest a strategy to cope flexibly in complex lesions or unexpected situations in hybrid OR. CBCT with real-time navigation software could augment the usefulness of hybrid OR.

Language and Symbolic Reference in Whitehead′s Philosophy (화이트헤드의 언어 이해와 상징적 연관)

  • 문창옥
    • Lingua Humanitatis
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    • v.6
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    • pp.147-166
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    • 2004
  • Whitehead's discussion of language is not to be found in any one book or article. It is interwoven with his discussion of many other questions. He was, however, greatly concerned with the problem of symbolism in general and the uses of language. He regards language, spoken or written, as an instrument devised by men to aid them in their adjustment to the environment in which they live Language is used for many specific purposes in the process of this adjustment. Words are employed not only to refer to data and to express emotions. They may be used also to record experiences, and thoughts about these experiences. Worts also function as instruments in the organization of experiences as they are considered in retrospect. Thus words free us from the bondage of the immediate. And Whitehead's theory of meaning is implicit in his discussion of the functions of language. According to him, the human mind is functioning symbolically when some components of its experience elicit consciousness, beliefs, emotions, and usages, respecting other components of its experiences. The former set of components are the 'symbols', and the latter set constitute the 'meaning' of the symbols. Whitehead points out that one word may have several meanings, i.e. refer to several different data. In order to understand, thus, the meaning to which a word refers, it is sometimes very important to appreciate the system of thought within which a person is operating. Further, Whitehead's discussion of language includes a number of cogent warning the deficiencies of language, and hence the need for great care in the use of words. In fact, language developed gradually. For the most part we have created words designed to deal with practical problems. Attention focuses on the prominent features in a situation, in particular the changing aspects of things. With reference to such data our words are relatively adequate. However, this issues in an unfortunate superficiality. The enduring, the subtle, the complex and the general aspects of the universe do not have adequate verbal representation. for this reason, Whitehead's position concerning the uses of language in speculative philosophy is stated with pungent directness. The uncritical trust in the adequacy of language is one of the main errors to which philosophy is liable. Since ordinary language does not do justice to the generalities, profundities and complexities of life, it is obvious that philosophy requires new words and phrases, or at least the revision of familiar words and phrases. Proceeding to develop the theme Whitehead contends that words and phrases must be stretched towards a generality foreign to their ordinary usage. In the same vein Whitehead refers to the need to realize that language which is the tool of philosophy needs to be redesigned just as in physical science available physical apparatus needs to be redesigned. But even these words and phrases, stretched or redesigned, are never completely adequate in philosophical speculations. They are, in his opinion, merely a great improvement over ordinary language or the language science, mathematics or symbolic logic.

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Exploring Science Teachers' Experiences and Perceptions in Operating Science Core Schools (과학중점학교 담당교사 관점에서 본 운영 효과 및 교육적 의의에 대한 탐색)

  • Choi, Imjung;Lee, Hyunju
    • Journal of The Korean Association For Science Education
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    • v.41 no.2
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    • pp.171-181
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    • 2021
  • The purpose of the study is to explore the personal experiences and efforts of science teachers, who have worked in science core schools over the years, in order to evaluate the educational effects and implications of science core school policies. To achieve this purpose, we conducted semi-structured interviews with twelve individual science teachers who have operated programs and curriculum at science core schools. The results provided three case studies presenting how the teachers operated curriculum and how they perceived the benefits of science core schools and identified some commonalities in their experiences and perceptions through cross-case discussions. Three teachers in case studies presented different teaching orientations for science core schools, but they positively perceived its benefits and were very satisfied with the school environment and financial supports from government even though they had more burdens on work. In cross-case analysis among 12 teachers, the teachers commonly presented their passion and enthusiasm for organizing and implementing various extra-curriculum science activities. They believed that such efforts contributed to encouraging their students to consider their careers in science and engineering fields in college. And the differentiated school program has increased reputation and preference for the school from local parents and students. In addition, they felt that these efforts brought their own growth and professional development as science teachers.

Guided Wave Characterization Assessment for PWSCC Detection of Pressurizer Heater Sleeve Weld (가압기 히터슬리브 용접부 PWSCC 검출을 위한 유도초음파 특성 평가)

  • Joo, Kyung-Mun;Moon, Yong-Sig;Chung, Woo-Geun
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.7 no.2
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    • pp.21-25
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    • 2011
  • Although many defects in PZR heater sleeve have been reported continually from operating experiences in oversea nuclear power plant, utilities get into difficulties in finding appropriate methods for diagnostics of the components due to the limited access or high radiation problems. Recently, as an alternative, diagnostics using Guided Wave Testing(GWT) are proposed and the attention of the methods has been growing gradually because of their long range inspection capability. This study is to investigate the effectiveness of GWT to detect PWSCC in welding points of PZR heater sleeve. Moreover, mode sensitivity analysis of GWT and optimal frequency for the diagnostics of PWSCC are presented by testing the mock-ups specimens that contain artificial flaws.

Development of Alternative Algorithms to the Decoupled Load Flow (Decoupled Load Flow 알고리즘에 대한 유용한 대안 알고리즘들의 개발)

  • Lee, Seung-Chul;Park, Sang-Soo;Park, Kyung-Bae
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.12
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    • pp.1514-1519
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    • 1999
  • This paper presents two flexible alternatives to the decoupled load flow(DCL) method. The proposed load flow methods can improve the convergence profiles of the DCL by reflecting in part the effects of the off-diagonal terms in the Jacobian at minimal costs. They can improve the convergence characteristics especially when the power system operating states deviate from the conditions required for stable convergence of the DCL and the P-Q coupling becomes significant. Two algorithms are obtained from the expression of the full Newton-Raphson load flow (NRL) method by successively diminishing the effects of the off-diagonal submatrices in the Jacobian. In the process of simplification, the Neuman series expansion is utilized. Test results show promising performances of the proposed algorithms in their convergence characteristics both in number of iterations and overall convergence speeds. Proposed algorithms are expected to provide flexible alternatives to the NRL when the DCL experiences convergence problems.

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Distribution Feeder Reconfiguration Using Heuristic Rules (경험적 규칙을 이용한 배전계통의 재구성기법)

  • Cho, Si-Hyung;Choi, Byoung-Youn;Woo, Kwang-Bang
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.363-365
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    • 1991
  • This paper presents a method for feeder reconfiguration in order to operate distribution systems efficiently using heuristic rules. The reconfiguration method presented here not only eliminates various abnormal states but also achieves minimum power loss and optimum load balance of the distribution feeders under normal operating condition transfering loads from one feeder to anoter applying the experiences of the experts. To implement the method effectively, a best-first tree searching strategy based on heuristics is used to evaluate the various load transfer alternatives. The development of a rule-based system aimed at the reduction of the search space is presented as a means of implementing the best-first searching strategy. The results of the computer simulation of the above procedure are as follows; 1) achieving minimum power loss of the distribution feeder adopting the optimum load transfer alternative. 2) Enhencing system reliability and achieving load balance through rational allocation of the feeder loads.

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