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고유함수전개법을 이용한 비대칭 유전체 원주공진기의 공진특성해석
류원열,민경호,장중호,전오곤,이창화,최현철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The resonant frequency of the dielectric rod resonator which is surrounded by cylindrical cavity can be calculated very exactly by using eigenfunction expansion method in the concept of electric and magnetic wall from the symmetry. But if the supporter is put in the cavity, the symmetry disappears. Thus this method has some errors. In this paper, the resonant frequency of the asymmetric dielectric rod resonator was calculated by using the eigenfunction expansion method. Also, the effect of the supporter was discussed. Then we found that the resonant frequency was more affected in the case of TM mode than TE or Hybrid modes as the length of the supporter was longer.
류해일,백중현,김영유 공주대학교 사범대학 과학교육연구소 1998 과학교육연구 Vol.29 No.1
현대 과학에서 가장 첨예하게 대두되는 것은 전자 제품의 개발 및 경쟁적 연구 투자이다. 고도의 기술을 요하는 전자 제품의 사용은 그 목적과 이용 방법에서 새로운 특성과 안전을 요구하고 있다. 특히 항공기, VTR, TV, 전자 회로, 컴퓨터 등의 정밀 제품에서 발생하는 전자기적 간섭 효과는 기기의 정밀도 및 수명을 저해하며 파괴의 원인이 되어지고 있다. 이러한 관점에서 본 연구에서는 유리, 금속 표면, 전자장치, 폭발물 및 인화성 보관 용기 등의 각종 전자 제품에 이용할 수 있는 전도성 수지 및 테이프를 개발하여, 전자기 제품에 안정성을 제공하고 수지의 전기전도도, 접착력, 내열성, 박리 강도, 점도 및 정전기 발생 등의 물리적 특성을 분석하여 최적 조건을 도출하여 개발하고 그의 응용성을 연구하였다. Nowadays, the development of the tapes which have anti-electrostatic adhesion at aircraft, VTR, TV, electric circuit, and computer brings much profits to industries. The development of industrial techniques needs specialized materials which are stable under the chemical and physical conditions, because it provides valuable products on a particular type of adhesive property. In this study, anti-electrostatic adhesive tapes were studied as a new form which can be used on glass, metal surface, electronic products, electronic device, car, aircraft accessaries, and exploder.
초고층건축물의 공공성 증진을 위한 계획방향에 관한 연구
신중진,임창복,류훈,박종현 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10
The purpose of this study is to suggest the planning strategy of super tall building for publicness improvement in the points of urban, local and environmental level As a result is summarized with 8 theme, content is following as First, skyscrapers plan to consider urban grad and local character Second, urban landscape plan to promote city identity and image Third, context plan to consider local history and culture Fifth, pedestrian network plan to link near site and district Sixth, pedestrian environment plan to promote physical and sensibility Seventh, the security of residential environment and insurance of residential amenity In last, consideration to prevent corruption of surrounding local environment
오건환,백중현,박병빈,류해일 공주대학교 사범대학 과학교육연구소 1998 과학교육연구 Vol.29 No.1
측쇄가 메틸, 페닐 혹은 이들이 혼합된 구조인 폴리 실란계 및 공중합체를 합성하고, 이들에 요오드를 도핑하여 폴리실란/I₂고분자들을 얻었다. 그들의 구조적, 열적, 전기적 특성을 분광학적 방법을 통하여 연구되어졌다. 열분석에 의하여 측쇄그룹이 메틸기에서 페닐기로 치환됨에 따라 열안정성이 증가함을 확인하였다. 요오드로 도핑된 고분자들은 도핑되지 않은 고분자들에 비하여 여러 단계의 열분해가 일어나며 잔기의 함량도 높았다. 전도도는 폴리실란에서는 ?? 범위의 값을 가지고, 도핑 폴리실란에서 ?? 범위의 값을, 공중합체에서는 ?? 값을 나타내었다. Polysilanes and copolymers which had side chains of methyl, phenyl, and mixed structures, were synthesized. The structural, thermal, and electrical characteristics of the polymers were systematically studied with spectroscopic methods. The thermal stabilities of the polymers were found to increase in polymers with phenyl substituents. The bathochromic shift of polysilanes with phenyl substituents relates probably to the narrowed band gap caused by delocalization of electron. The polymers were modified by doping process with iodine. The polymers doped with iodine showed multi-step pyrolysis behavior. The electric conductivities of the undoped and doped polysilanes were ?? and ??, respectively.
( Joong Hyun Ryu ) 한국운동역학회 2018 한국운동역학회지 Vol.28 No.1
Objective: The human body is often modelled as a spring-mass system. Lower extremity stiffness has been considered to be one of key factor in the performance enhancement of running, jumping, and hopping involved sports activities. There are several different classification of lower extremity stiffness consisting of vertical stiffness, leg stiffness, joint stiffness, as well as muscle and tendon stiffness. The primary purpose of this paper was to review the literature and describe different stiffness models and discuss applications of stiffness models while engaging in sports activities. In addition, this paper provided a current update of the lower extremity literature as it investigates the relationships between lower extremity stiffness and both functional performance and injury. Summary: Because various methods for measuring lower extremity stiffness are existing, measurements should always be accompanied by a detailed description including type of stiffness, testing method and calculation method. Moreover, investigator should be cautious when comparing lower extremity stiffness from different methods. Some evidence highlights that optimal degree of lower extremity stiffness is required for successful athletic performance. However, the actual magnitude of stiffness required to optimize performance is relatively unexplored. Direct relationship between lower extremity stiffness and lower extremity injuries has not clearly been established yet. Overall, high stiffness is potentially associate risk factors of lower extremity injuries although some of the evidence is controversial. Prospective injures studies are necessary to confirm this relationship. Moreover, further biomechanical and physiological investigation is needed to identify the optimal regulation of the lower limb stiffness behavior and its impact on athletic performance and lower limb injuries.
The influence of monochorionicity on the perinatal outcomes in spontaneously conceived twins
신중식 ( Joong Sik Shin ),( Jae Hyug Yang ),( Hyun Mee Ryu ),( Moon Young Kim ),( Jung Yeol Han ),( Hyun Kyong Ahn ),( Jin Hoon Chung ),( Ha Jung Lim ),( June Seek Choi ),( Joo Oh Kim ),( Su Hyun Park ) 대한산부인과학회 2004 대한산부인과학회 학술대회 Vol.90 No.-