• 한국멀티미디어학회논문지
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• 제6권5호
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• pp.896-908
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• 2003

3D 가상환경에서의 상호작용기법은 가상공간 사용자의 몰입감과 사실감에 결정적인 영향을 미치는 매우 중요한 요소이다. 특히 데스크탑환경의 전자매뉴얼과 같이 정교한 객체조작이 요구되는 분야에서는 효과적이고 자연스런 객체조작을 위한 상호작용기법이 절실히 요구되고 있다. 본 논문에서는 객체를 구성하는 장면 그래프를 사용자의 선택에 따라 내부적으로 분할, 생성된 선택 후보 리스트론 이용하여 객체의 세부 단위요소를 정확하게 선택하고, 이동 및 회전 등의 조작을 하며 선택을 해제할 수 있는 일련의 조작 기법을 제안한다. 여기엔 각 조작단계마다 다양한 시각피드백 기능을 지원함으로써 객체조작을 보다 효과적으로 수행할 수 있는 기능도 포함된다. 제안된 기법은 정교한 객체의 조작을 필요로 하는 분야의 3D 사용자 인터페이스 구축에 효과적으로 적용될 수 있을 것이다.

• 생물정신의학
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• 제18권4호
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• pp.217-224
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• 2011

Subsyndromal bipolar symptoms are common during maintenance treatment and appear to be associated with relapse into an episode of the same polarity. This implies subsyndromal symptoms are an important problem in recurrent bipolar disorder and require more additive and infallible therapeutic intervention. Undetected, untreated subsyndromal states lead patients to have poor prognosis and quality of life. The combination of a long undetected illness and significant psychosocial impairment renders early identification and intervention vital for the treatment of bipolar disorders. Methods for early identification includes finding prodromes, using screening tools such as the HCL-32 (Hypomania Checklist-32) and the BSDS (bipolar spectrum diagnostic scale). Various augmentation treatment methods would be needed to reduce subsyndromal symptoms, especially, psychosocial treatment has the potential to help patients address the multiple psychosocial problems associated with this chronic illness. To overcome difficulties of diagnosing subsyndromal disorder and to treat it appropriately, a staging system was suggested by some researchers. It assumes that earlier stages have better prognosis and require simpler therapeutic regimens. Staging may assist in treatment planning and prognosis of bipolar disorder, and emphasize the importance of early intervention. Further research is required in this exciting and novel area.

• Journal of Advanced Marine Engineering and Technology
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• 제27권3호
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• pp.412-420
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• 2003

This study describes the merits of PWM control of hydraulic system using high speed on-off valves. Generally, Electro-hydraulic valves can be classified into two classification: valves which are controlled by analog signal and which are controlled by digital. The former includes hydraulic servo valves and proportional valves which require A/D converters as interface to digital computer and too costly and sensitive to oil contamination because of complexity in structures. The latter includes high speed on-off valves which do not require A/D converters because they are normally operated in a pulse width modulation(PWM) method, and are low in price and robust to oil contamination because of their simple structures. The objectives of this study is to analyze the limit cycle which regularly appear in the position control system using 2/2way high speed on-off valves and to give a criterion for the stability of this system. The nonlinear characteristics of PWM and cylinder friction of this system are described by harmonic linearization and the effects of parameter variations to the system stability are simulated.

• 대한기계학회논문집A
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• 제25권2호
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• pp.182-191
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• 2001

The paper describes the improvement on concurrent subspace optimization(CSSO) via automatic differentiation. CSSO is an efficient strategy to coupled multidisciplinary design optimization(MDO), wherein the original design problem is non-hierarchically decomposed into a set of smaller, more tractable subspaces. Key elements in CSSO are consisted of global sensitivity equation, subspace optimization, optimum sensitivity analysis, and coordination optimization problem that require frequent use of 1st order derivatives to obtain design sensitivity information. The current version of CSSO adopts automatic differentiation scheme to provide a robust sensitivity solution. Automatic differentiation has numerical effectiveness over finite difference schemes tat require the perturbed finite step size in design variable. ADIFOR(Automatic Differentiation In FORtran) is employed to evaluate sensitivities in the present work. The use of exact function derivatives facilitates to enhance the numerical accuracy during the iterative design process. The paper discusses how much the automatic differentiation based approach contributes design performance, compared with traditional all-in-one(non-decomposed) and finite difference based approaches.

• 대한기계학회논문집A
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• 제28권3호
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• pp.230-237
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• 2004

Lane Sensing techniques based on vision sensors are regarded promising because they require little infrastructure on the highway except clear lane markers. However, they require more intelligent processing algorithms in vehicles to generate the previewed roadway from the vision images. In this paper, a lane sensing algorithm using vision sensors is developed to improve the sensing robustness. The parallel stereo-camera is utilized to regenerate the 3-dimensional road geometry. The lane geometry models are derived such that their parameters represent the road curvature, lateral offset and heading angle, respectively. The parameters of the lane geometry models are estimated by the Kalman filter and utilized to reconstruct the lane geometry in the global coordinate. The inverse perspective mapping from the image plane to the global coordinate considers roll and pitch motions of a vehicle so that the mapping error is minimized during acceleration, braking or steering. The proposed sensing system has been built and implemented on a 1/10-scale model car.

• 한국건설관리학회논문집
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• 제5권3호
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• pp.153-165
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• 2004

현재 국내의 종합병원 건축 시 "설계단계"에서는 초기단계에서부터 병원 관리자의 병원 운영정책 및 실사용 주체인 의료진의 의견반영이 미흡하고 의료장비, 의료경향의 신속한 변화로 인하여 잦은 설계변경이 발생하며 "시공단계"에서는 병원이라는 공사의 특성에 대한 공사 관련자들의 이해부족으로 인하여 재시공이 발생되어 국내 병원공사 프로젝트 수행과정 중 공사비 증가 및 공기지연 등의 문제점이 매우 빈번하게 발생되고 있다. 본 논문에서는 전문가 면접조사 및 사례조사를 통하여 병원공사의 시공성 저해 요인을 조사하고, 파트너링 기법을 분석하여, 병원건축의 시공성 증대 방안으로 시공이전단계에 파트너링을 활용한 병원건축의 '의료 지식/정보공유 시스템'을 제안하였다. 제안된 시스템을 검증하기 위하여 실제 대형병원프로젝트에 적용하여 파트너링을 활용한 대형 병원건축에서의 시공성 증대를 위한 파트너링 모델의 적합성을 확인하였다.

• 디지털산업정보학회논문지
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• 제12권4호
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• pp.41-49
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• 2016

Smart Grid is a next generation of new power growth electrical grid which provide high quality of electrical service by using Information Technologies to increase intelligence and performance. By using Smart Grid system, it can support energy management such as increase quality of electrical power, decrease energy and decrease emissions. However, Smart Grid uses information of energy consumption and when Smart Grid collects information, it will create private information. In this thesis, it will address issues of security private information which caused by Smart Grid for administrative measure and efficiency of Smart Grid in domestic. Also, cryptographic module algorithm, latest security solutions and strong wireless security policy for network environment such as wireless communication Iinternet are require for Smart Grid perform successfully and protect national power network equipment from cyber-attack and can stop leakage of user's personal information. Finally, it is urgent to prepare protection measures of National industrial facilities and power grid which can prepare for a cyber terrorism and penetration attacks and build emergency countermeasure management team for Smart Grid are require for safe Smart Grid environment.

• 한국정밀공학회지
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• 제27권9호
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• pp.58-66
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• 2010

This study examines thermal safety on three-way catalyst that dominates 70 % among whole exhaust gas purification device in 2003. Three-way catalyst durability in the Korea requires 5 years/80,000 km in 1988 but require 10 years/120,000 km after 2002. Three-way catalyst durability in the USA requires 7 years/120,000 km but require 10 years/160,000 km after 2004. Three-way catalyst maintains high temperature in interior domain but maintains low temperature on outside surface. Therefore this device shows tensile stress on outside surface. Temperature distribution of three-way catalyst was acquired by thermal flow analysis for predicted thermal flow parameter. Thermal stress analysis for three-way catalysis was performed based on this temperature distribution. Thermal safety of three-way catalyst was estimated by power law dynamic fatigue life estimation and strength reduction methods for thermal stress.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 International Symposium
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• pp.89-110
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• 2003

최근 현장(In situ)에서의 토양 및 지하수 오염 정화는 오염물질을 현장에서 추출해 지상에서 처리하는 것이 아니라, 직접 현장에서 미생물 혹은 화학물질과 오염물질의 혼합을 통한 분해기 작을 이용해, 오염물질을 제거하는 과정을 의미한다. 이러한 현장오염정화 기법 중 하나가 Figure 1에 도시한 수직흐름처리정(Horizontal Flow Treatment Wells, HFTWs)으로 2개의 정(well) 중간지점에 반응물질을 설치한 후 각각의 정에서 상향 및 하향흐름을 발생시켜 주위의 지하수를 순환시키면서 정화하는 기법이다.

• Toxicological Research
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• 제13권4호
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• pp.385-391
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• 1997

Inductive effects of cytochrome P450 2B1 by $\alpha$- and $\beta$-ionone were characterized in individual liver lobes of male Sprague Dawley rats. When rats were administered ionones orally at 100, 300, and 600 mg/kg for 24 hr, cytochrome P450 2B1 was induced dose-dependently in liver S-9 fractions as measured by P450 2B-specific monooxygenases and Western immunoblotting. The activity of P450 1A- and P450 2B-specific monooxygenases was differentially expressed in each lobe of normal liver. In addition, the monooxygenase activity was induced by $\alpha$- and $\beta$-ionone with different potency in each lobe of the liver. Our present results indicate that the different induction of P450s by $\alpha$- and $\beta$-ionone in each lobe may explain different susceptibilities of rat liver lobes to certain hepatotoxicants which require metabolic activation for their toxicity and that $\alpha$- and $\beta$-ionone may be useful model inducers of P450 2B1 in studying the toxic mechanism of certain toxicants which may require the metabolic activation by P450.