압력센서의 디지털 인터페이스와 신호처리에 관한 연구

강형구,이종호,안광희,이충호,박찬원 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-

A smart pressure measurement system is described, which provides a precise A/D conversion and is highly suitable for communication with microprocessors. In order to avoid unstable problems of remote pressure sensing we have developed a new interface board which performs the A/D conversion and smart signal processing of the measured pressure data Serial communication software which is based on ASCII code commands is also developed to process initial setup an calibration functions as well as multi-drop communication with PC. The test and evaluation of the proposed system has been shown as having the better performance compared to the other types of existing pressure measuring systems and will give good applications to the industrial use where a highly precision remote sensing is needed.

뇌졸중 위험인자를 가진 어지럼 환자에서의 확산강조 자기공명영상

강형구,윤유상,이진희,박인철,이경룡,정상원,구홍두,김승호 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Background: The management of vertiginous patients is a great challenge to emergency physicians. We evaluated the diagnostic value of a diffusion-weighted image(DWI) in differentiating central vertigo from the peripheral vertigo in patients who presented no neurological symptoms other than risk factors for stroke. Methods: From March 2000 to February 2001, we retrospectively analyzed the cases of 68 patients who visited the emergency department with symptoms of isolated vertigo and who had risk factors for stroke. DWIs, computed tomograms(CT), and medical records were reviewed, and the final diagnose, the DWIs and the CT readings, the risk factors for stroke, and the time it took waiting for a DWI or CT scan were analyzed. Results: Of the 68 patients, 21(30.8%) had central vertigo: 15 vertebrobasilar transient ischemic attacks(VB-TIA), 4 brain stem infarctions, 1 cerebellar infarction, and 1 cerebellopeduncular infarction. The DWI showed a 28.6% sensitivity, a 97.9% specificity, and an 85.7% positive predictive value in diagnosing central vertigo. It also had a 100% sensitivity in detecting infarctions. Conclusion: A DWI had a comparable sensitivity to MRI in detecting central vertigo and small, but potentially, lethal infarctions in our patient population. We recommend clinical application of DWI in the emergency department evaluation of isolated vertigo patients with risk factors for stroke.

월견초 종자추출물 투여에 의한 생체면역 반응 억제 및 그 기전

강현구,유형근,신형식 圓光大學校 1993 論文集 Vol.27 No.2

Recently, essential fatty acids(EPA) have started commanding clincal interest. Their vast possibilities for therapeutic use make basic knowledge of their chemical nature and physiologic significance a necessity. EPAs are important not only in themselves but also as precursors of other polyunsaturayed fatty acids. Evaing primrose extract(EPE) is a naturally occurring rich source of EPA especially linoleic and gamma-linolenic acid which are biosynthetic precursors of prostaglandins(PG). SO gamma-linolenic acid in the form of particular variety of EPE has been extensively reported of value in the treatment of various disorders resulting from the abnormalities of EPA. However, surprisingly little has been done to develope and exploit EPE’s immunomodulating properties. Moreover, the mechanisms of EPE action on ommune function has not been elucidated. This study was designed to evaluate the effect of EPE on the cellular and humoral immunr responses of mice, and to investigate the mechanisms responsible for the immunomodulating action of EPE. Mice sensitized with ?? SRBC were injected with EPE(1mg/mouse,ip) for 4 days before SRBC, and/or with cholesterol(CHO,10mg/mouse,sc) on day O of SRBC, or with indomethacin(an inhibitor of PG-synthetase, IDM, 0.15mg/mouse,ip) on day-1 and O of SRBC, and challenged with a dose of ?? SRBC on day 4 of sensitization. The effect of EPE on immune response and the effect of CHO and IDM on EPE-induced immunosuppression were evaluated by measuring the footpad sweelling reaction and antibody response to SRBC. EPE itself did not influence arthus reaction but remarkably reduced delayed type hypersesitivity(DTH) and antibody production in comparison with the corresponding control. While CHO slightly increased Arthus reaction and DTH but it somewhat decreased antibody responses. IDM significantly enhanced both cellular and humoral immune response. And when CHO or IDM was administered into mice in combination with EPE, both of them significantly blocked the immunosuppressive activities of EPE at the almost same degree. Taken together, the present study revealed that EPE iteslf has immunosuppressive principle, and that this nonspecific immune-inhibitory effect of EPE might be manifested partially via the decrement of the CHO-levels and partially via the enhancement of PG synthesis.

전국 응급의학과 수련병원의 응급실 병력지에 대한 분석

임태호,임훈,이종호,강형구,장문준,조광현,장석준,김승호,정상원 대한응급의학회 2000 대한응급의학회지 Vol.11 No.4

Background: This study was designed to analyze the current emergency department(ED) medical records of teaching hospitals in Korea. Methods: The five-item questionnaires were mailed to the EDs of 40 hospitals. Among them, 27 questionnaires and 35 ED medical records were returned for reply rates of 67.5% and 87.5%, respectively. Results: 1) The actual number of data elements in the ED medical records used by each hospital varies widely. It ranges from 1 to 15 data elements with an average of 7.5 data elements. 2) Thirteen data elements, signature of nurse, checklist style in review of systems, checklist style in physical examination, neurologic examination, figure of face, Glasgow coma scale, trauma scale, treatment plan, mode of transfer, condition on transfer, documents sent with patient, condition on discharge or discharge instruction, use of pediatric chart and vaccination history are used by less than 50% of the medical records examined. 3) There was no difference in the total number of data elements or in redesign and computerization of ED medical record based on the location of the hospital, the type of hospital administration, or the number of years since the start of EM residency program. 4) There was a statistically increased number of data elements in redesigned medical records. 5) In the survey, 89% of the residents replied that medical records needed to be redesigned. With respect to uniformity, 58% of the residents disagreed. A well-designed checklist chart rather than a descriptive chart was preferred by 89% of the residents. Conclusion: The currently used ED medical records have much room for improvement. The age of the ED had little impact on the quality of ED medical records. More attention and effort in this field are needed. In addition, The Korean Society of Emergency Medicine should provide guidelines for ED medical records.

초전도 저장장치의 신경회로망 모형 및 이를 이용한 안정도해석 앨고리즘 개발에 관한 연구

林裁尹,張勝燦,金正勳,姜亨求 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

Recently the need of energy storage device such as the pumped-storage has more and more increased in power system in order to aid a side reliability. But it has the problem of environment. As an alternative way of installing it, the Superconducting Magnetic Energy Storage(SMES) is widely study in a power system. Generally the SMES might divide in two class ; the storage use and the stability use. For use in storage SMES never has been construct, because of its expensive cost. Actively progressing the field of the study is for use in stability SMES, so as construction cost is relatively inexpensive. In order to application of the SMES in the power system, it has to be proven of stability efficiency through stability analysis. Stability analysis need modelling of the SMES. The existing model has been used only mathematical model that presented by first order delay time function, so that the SMES has fast response characteristic. But this kind of mathematical model of dynamic system have some problems when stability analysis requests more precision analysis. The problems are the complexity of equation, long calculus time and error of model-decision. For the purpose of settling this problems, this paper proposed an artificial neural network(ANN) methodology to make SMES modelling. ANN is presented using the input-output power characteristics of SMES. when it uses ANN which functions as a model-free system, network construction and parameters determination are carefully chosen to represent the complicated nonlinear input-output relation from the black-boxed SMES system. So far medelling of SMES by ANN never used stability analysis. In this paper, the proposed ANN-based SMES model is applied to analyze the power system stability and the simulation results provide the property of this approach.

Comparison of Impedance Cardiography with Thermodilution of Hemodynamic Parameters in Critically Ill Patients

Hyung Goo Kang,Sang Won Chung,Ki Hyun Byun,In Byung Kim Korean Society of Critical Care Medicine 2006 Acute and Critical Care Vol.21 No.2

BACKGROUND: To evaluate the feasibility of noninvasive hemodynamic monitoring (impedance cardiography, ICG) in critically ill patients, we compared this technique with simultaneous invasive monitoring with a pulmonary artery thermodilution catheter. METHODS: A prospective observational study was done comparing invasive monitoring and noninvasive monitoring in 12 critically ill patients. The cardiac output (CO), the stroke volume (SV) and the systemic vascular resistance (SVR) measured by using a standard thermodilution pulmonary artery catheter technique were compared with the corresponding measurements simultaneously using an ICG. RESULTS: The value of CO, SV and SVR measured by ICG were closely correlated to those by the thermodilution methods [r: 0.659 (p

A Study on the Technique and Process of Bending Wood

Kang, Hyung-Goo Korea Furniture Society 2010 한국가구학회지 Vol.21 No.6

가구를 디자인하는데 있어서 재료는 매우 중요한 요소이다. 목재는 가구 재료 가운데 가장 많은 부분을 차지하고 있다. 목재는 자연 재료로 부드럽고 환경 친화적인 반면에 수축과 팽창 같은 변화가 심해 목재가 지닌 특성을 고려하지 않으면 올바른 디자인을 할 수가 없다. 목재를 다루는 기술 가운데 휨 가공법은 가구의 다양한 형태를 만들어내는데 매우 유용한 기술 가운데 하나이며, 오래 전부터 가구제작에 사용되어 오면서 증기, 암모니아, 고주파 등 가공방법에 관한 기술적 발전을 가져왔다. 목재는 점탄성 물질로 약간의 가소성을 가지고 있어 힘을 가하면 아름다운 곡선을 만들 수 있는 재료적 특성을 가지고 있다. 따라서 이 논문은 지금까지 가구제작에 사용되어 온 휨 가공법의 종류와 그 특성들을 조사하여 대량생산 또는 소량생산에 적합한 방법들을 체계적으로 분류하여 가구의 형태와 생산방식에 따라 어떠한 가공법을 사용하여야 되는지를 연구하고자 한다. 이번 연구를 통해서 휨 가공방법의 장점은 가구디자인에서 디자이너의 다양한 아이디어를 표현할 수 있는 기술적 방법의 한 가지라 할 수 있다. 분석결과 증자처리 휨 가공은 다품종 소량생산에 적합하고, 암모니아 휨 가공은 스프링 백 현상이 없으며 다양한 자유곡선의 형태 가공에 적합한 방법이라 할 수 있다. 대량생산에서는 고주파 가공이 많이 사용되며, 거단 휨 가공은 작업방법이 용이했고, 적층 휨 가공은 가장 일반적인 가공법으로 소량 또는 대량생산에 모두 적합한 가공법이라 할 수 있다. 또한 이 연구를 통해 많은 가구 디자이너와 제작자들이 목재의 휨 가공에 도움을 주는데 목적이 있다. Materials are such an important factor in designing furniture. Wood is the biggest part of furniture materials. While wood is soft, eco-friendly and natural material, it is variable because it is characterized by severe expansion and contraction. Thus, if the changeable characteristic of wood is not considered in furniture design, the good design of furniture cannot be produced. As one of the skills dealing with woods, bending is such a useful way for making various forms of furniture. While it has been used in furniture-making for a long time, wood processing techniques like steaming bending, bending with ammonia and high frequency bending has been advanced. As wood is a viscoelastic material and has some plasticity, beautiful curves can be created when force is applied. Therefore this paper studies the types of bending methods for furniture and each characteristic of them. Furthermore, this study classifies wood process according to suitability for mass production or small-scale production and researches the proper wood process by the forms and the way of furniture production. Also this study aims to help furniture designers and cabinet makers with wood bending.

Trellis Defection of Tamed FM with the DLMS and Convergence

Kang, Min-Goo,Lee, Yang-Won,Cho, Hyung-Rae,Kang, Sung-Chul The Korea Institute of Information and Commucation 1997 한국정보통신학회논문지 Vol.1 No.2

The Maximum Likelihood Sequence Estimation scheme is modified to improve the error performance of the correlative coding in the Tamed FM. To remove intersymbol interference, the Decision Feedback Equalization scheme with the delayed LMS algorithm and the Viterbi algorithm(10-symbol delay) in the delayed adaptive equalization are proposed for the performance of decision-directed adaptive equalization under the High Frequency channels, and the condition of convergence is analyzed.

A Study on the Technique and Process of Bending Wood

Hyung-Goo Kang 한국가구학회 2010 한국가구학회지 Vol.21 No.6

가구를 디자인하는데 있어서 재료는 매우 중요한 요소이다. 목재는 가구 재료 가운데 가장 많은 부분을 차지하고 있다. 목재는 자연 재료로 부드럽고 환경 친화적인 반면에 수축과 팽창 같은 변화가 심해 목재가 지닌 특성을 고려하지 않으면 올바른 디자인을 할 수가 없다. 목재를 다루는 기술 가운데 휨 가공법은 가구의 다양한 형태를 만들어내는데 매우 유용한 기술 가운데 하나이며, 오래 전부터 가구제작에 사용되어 오면서 증기, 암모니아, 고주파 등 가공방법에 관한 기술적 발전을 가져왔다. 목재는 점탄성 물질로 약간의 가소성을 가지고 있어 힘을 가하면 아름다운 곡선을 만들 수 있는 재료적 특성을 가지고 있다. 따라서 이 논문은 지금까지 가구제작에 사용되어 온 휨 가공법의 종류와 그 특성들을 조사하여 대량생산 또는 소량생산에 적합한 방법들을 체계적으로 분류하여 가구의 형태와 생산방식에 따라 어떠한 가공법을 사용하여야 되는지를 연구하고자 한다. 이번 연구를 통해서 휨 가공방법의 장점은 가구디자인에서 디자이너의 다양한 아이디어를 표현할 수 있는 기술적 방법의 한 가지라 할 수 있다. 분석결과 증자처리 휨 가공은 다품종 소량생산에 적합하고, 암모니아 휨 가공은 스프링 백 현상이 없으며 다양한 자유곡선의 형태 가공에 적합한 방법이라 할 수 있다. 대량생산에서는 고주파 가공이 많이 사용되며, 거단 휨 가공은 작업방법이 용이했고, 적층 휨 가공은 가장 일반적인 가공법으로 소량 또는 대량생산에 모두 적합한 가공법이라 할 수 있다. 또한 이 연구를 통해 많은 가구 디자이너와 제작자들이 목재의 휨 가공에 도움을 주는데 목적이 있다. Materials are such an important factor in designing furniture. Wood is the biggest part of furniture materials. While wood is soft, eco-friendly and natural material, it is variable because it is characterized by severe expansion and contraction. Thus, if the changeable characteristic of wood is not considered in furniture design, the good design of furniture cannot be produced. As one of the skills dealing with woods, bending is such a useful way for making various forms of furniture. While it has been used in furniture-making for a long time, wood processing techniques like steaming bending, bending with ammonia and high frequency bending has been advanced. As wood is a viscoelastic material and has some plasticity, beautiful curves can be created when force is applied. Therefore this paper studies the types of bending methods for furniture and each characteristic of them. Furthermore, this study classifies wood process according to suitability for mass production or small-scale production and researches the proper wood process by the forms and the way of furniture production. Also this study aims to help furniture designers and cabinet makers with wood bending.

콘크리트구조물의 시간의존적 설계VE 및 LCC분석 모델

강형구 ( Kang Hyung-goo ),손용우 ( Sohn Yong-woo ),이증빈 ( Lee Cheung-bin ),최미라 ( Choi Mi-ra ),박주원 ( Park Ju-won ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1

In the resent years, the importance of VE (value engineering) and LCC (life cycle cost) analysis for concrete construction projects has been fully recognized. Accordingly theoretical models, guidelines, and supporting software systems were developed for the value engineering and life cycle cost analysis for concrete construction including bridges and building systems. However, the level of consensus on VE and LCC analysis results is still low due to the lack of reliable data on maintenance. This paper presents time dependent LCC model based value analysis method for rational investment decision making and design alternative selection for construction of concrete structures. The proposed method incorporates a time dependent LCC model and a performance evaluation technique by fuzzy logic theory to properly handle the uncertainties associated with statistics data and to analyze the value of alternatives more rationally. The presented time dependent VL and LCC analysis procedure were applied to a real world project, and this case study is discussed in the paper. The model and the procedure presented in this study can greatly contribute to design value engineering alternative selection, the estimation of the life cycle cost, and the allocation of budget for concrete construction projects.