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고현정(Hyun-Jung Koh),손창식(Chang-Sik Son),정환묵(Hwan-Mook Chung) 한국지능시스템학회 2004 한국지능시스템학회 학술발표 논문집 Vol.14 No.1
생물과 같이 외부 환경의 변화에 적응하는 능력을 갖도록 하기 위한 시스템을 다치오토마타를 사용하여 모델화하고 이들에 대하여 도태, 교배, 돌연변이 등의 유전적 조작을 반복함 적용에 의해 유한 상태 전이 과정을 해석하교 응용할 수 있는 방법을 제안한다. 이러한해석과 방법에 대한 모델을 기초로 자기 갱신할 수 있는 자율오토마타와 환경에 적응할 수 있는 적응 오토마타를 실현하는 기초 단계로 적용할 수 있는 가능성을 제안한다.
고현정(Hyun-Jung Koh),정환묵(Hwan-Mook Chung) 한국지능시스템학회 2006 한국지능시스템학회논문지 Vol.16 No.6
최근 유비쿼터스 컴퓨팅 환경에서 핵심적인 요소 기술인 상황 인식 시스템을 실현하기 위해 필요한 상황 정보를 수집하는데 점차 센서의 활용과 응용분야가 확대되고 있다. 상황 인식 서비스는 센서로부터 수집된 상황 정보를 통합하고 해석 및 추론 과정을 거쳐 사용자에게 상황에 따라 적절한 서비스를 제공하는 것으로 매장, 의료, 교육 등의 응용분야에서 많이 연구되고 있다. 본 논문에서는 다치 함수의 차분 및 구조적 성질을 이용하여 주변 상황 등을 인식하는 방법과 그 인식 결과를 해석하여 주변상황의 변화에 따른 적절한 서비스를 제공할 수 있는 모델을 제안하고 적용 예를 통하여 확인한다. The Context-Aware system is the core technology in the Ubiquitous Computing Environment. Recently, the practical use of a sensor is magnified and the application fields of it are gradually extended in order to collect necessary context information. Context-Aware service integrates the context information which is collected by sensors, and then provides, a suitable service to a user through the process of analysis and reasoning. This service is studied in a variety of fields such as marketing, medical treatment, education and so on. In this paper, we analyze the method of recognizing surrounding context and the result of the awareness by using differential and structural property of multiple valued logic function; propose the model that provides appropriate service depending on the change of surrounding context; confirm the applicability of the Context-aware system by showing the example of application.
Slot 코팅 공정에서 Non-Newtonian 유체의 코팅 균일성을 위한 최적 다이 설계
이시형 ( Si Hyung Lee ),고현정 ( Hyun Jung Koh ),심서훈 ( Seo Hoon Shim ),정현욱 ( Hyun Wook Jung ),현재천 ( Jae Chun Hyun ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.3
In this study, the flow behavior of Newtonian and non-Newtonian coating liquids inside slot die has been scrutinized for the purpose of optimal internal die design in slot coating system from three-dimensional computations by CFD Fluent solver. A hybrid slot die could be optimally designed by changing the chamber or manifold structure to guarantee the uniform velocity distribution of coating liquids at die exit. Especially, for the non-Newtonian coating liquids, the length of coat-hanger for the uniform coating has been properly chosen, according to the degree of their shear-thinning properties.
임상연구 : 비뇨기과 수술을 받는 노인 환자의 척추마취 시 첨가된 Fentanyl의 용량에 따른 임상효과의 비교
김정은 ( Jeong Eun Kim ),문영은 ( Young Eun Moon ),홍상현 ( Sang Hyun Hong ),전준표 ( Joon Pyo Jeon ),장혜원 ( Hae Wone Chang ),김수진 ( Su Jin Kim ),고현정 ( Hyun Jung Koh ),유건희 ( Keon Hee Ryu ) 대한마취과학회 2008 Korean Journal of Anesthesiology Vol.55 No.5
Background: Spinal anesthesia for urologic surgery in elderly patients is preferred. The addition of opioids to local anesthetics reduces the side effects of spinal anesthesia. This study examined the effects of intrathecal fentanyl 10 μg and 20 μg when administered with hyperbaric 0.5% bupivacaine to elderly patients undergoing urologic surgery. Methods: Forty-five elderly patients undergoing urologic surgery were randomized into the following three groups: group 1, bupivacaine 7.5 mg; group 2, bupivacaine 5 mg + fentanyl 10 μg; and group 3, bupivacanie 5 mg + fentanyl 20 μg. The total volume of intrathecally injected was adjusted to 1.5 ml with sterile normal saline. Spinal anesthesia was administered with a 25 G Quincke needle at the L3-4 or L4-5 interspace in the lateral position. The neural block was assessed using a pinprick test and the Bromage scale. Results: There were no significant differences in the onset time of the T10 sensory block, peak level of the sensory block, and onset time of the peak level. The duration of the sensory block was significantly shorter in group 2 than in group 1 (P=0.017). The duration of the motor block was longer in group 1 than in groups 2 and 3 (P=0.016, P=0.04). Pruritus was observed more often in group 3 (37.5%) and shivering was more common in group 1 (P=0.005). Conclusions: The addition of fentanyl 10 μg and 20 μg to bupivacaine 5 mg provides adequate anesthesia for elderly patients undergoing urologic surgery with fewer side effects, and fentanyl 10 μg is recommended as outpatient anesthesia. (Korean J Anesthesiol 2008;55:579~84)