개량된 분기한정법에 의한 고속연산 2차원 상태공간 디지털필터의 설계

이영호,Lee Young-Ho 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.7

본 논문은 개량된 분기한정법(branch-and bound method)을 이용하여 고속연산이 가능한 2차원 상태공간 디지털 필터의 설계방법을 제안하였다. 설계된 디지털 필터가 갖는 계수행렬의 모든 요소 값들은 오직 2개의 2의 멱수 (powers-of-two) 의 합으로만 표현되어진다. 따라서 제안된 방법으로 설계한 2 차원 상태공간 디지털필터는 간단한 가산연산만으로 수행이 이루어지므로 고속연산이 가능하고, 또한 구조가 간단하며 저가격으로 실현이 가능하다는 장점을 가진다 . 본 논문에서 제안된 방법의 타당성을 설계예시를 통해 고찰한 결과, 설계된 디지털 필터의 근사오차와 군지연특성이 동일한 설계사양으로 연속계수공간에서 설계되어진 디지털필터와 비교하여 유사한 결과를 얻을 수 있었다. This paper presents an efficient design method of 2-D state-space digital filter based on an improved branch-and -bound algorithm. The resultant 2-D state-space digital filters whose coefficients are represented as the sum of two power-of-two terms, are attractive for high-speed operation and simple implementation. The feasibility of the proposed method is demonstrated by several experiments. The results show that the approximation error and group delay characteristic of the resultant filters are similar to those of the digital filters which designed in the continuous coefficient space.

Broadband Convergence Network 가입자 망 설계 시스템 연구

이영호,정진모,김영진,이순석,박노익,강국창,Lee, Young-Ho,Jung, Jin-Mo,Kim, Young-Jin,Lee, Sun-Suk,Park, No-Ik,kang, Kuk-Chang 한국경영과학회 2006 經營 科學 Vol.23 No.2

In this paper, we consider a network optimization problem arising from the deployment of BcN access network. BcN convergence services requires that access networks satisfy QoS meausres. BcN services have two types of traffics : stream traffic and elastic traffic. Stream traffic uses blocking probability as a QoS measure, while elastic traffic uses delay factor as a QoS measure. Incorporating the QoS requirements, we formulate the problem as a nonlinear mixed-integer Programming model. The Proposed model seeks to find a minimum cost dimensioning solution, while satisfying the QoS requirement. We propose two local search heuristic algorithms for solving the problem, and develop a network design system that implements the developed heuristic algorithms. We demonstrate the computational efficacy of the proposed algorithm by solving a realistic network design problem.

연구논문 : Fe - Mn - 5Si 계 합금에서의 형상기억효과와 ε 마르텐사이트 생성에 미치는 Co 첨가의 영향과 인장변형률의 효과

이영호,백무현,김상주 ( Young Ho Lee,Mu Heun Bak,Sang Ju Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 1991 재료.물성 심포지엄 Vol.- No.-

졸-겔법에 의해 제조한 K_0.5Bi_0.5TiO₃ 막과 압전발전기의 특성

이영호,박상식,Lee, Young-Ho,Park, Sang-Shik 한국재료학회 2021 한국재료학회지 Vol.31 No.11

K_0.5Bi_0.5TiO₃ (KBT) thin films were prepared by sol-gel processing for future use in piezoelectric generators. It is believed that the annealing temperature of films plays an important role in the output performance of piezoelectric generators. KBT films prepared on Ni substrates were annealed at 500 ~ 700 ℃. Tetragonal KBT films were formed after annealing process. As the annealing temperature increased, the grain size of KBT films increased. KBT thin films show piezoelectric constant (d₃₃) from 23 to 41 pC/N. The increase of grain size in KBT films brought about output voltage and current in the KBT generators. Also, the increase in the displacement of specimens during bending test resulted in increases in output voltage and current. Although KBT generators showed lower output power than those of generators prepared using NBT films, as reported previously, the KBT films prepared by sol-gel method show applicability as piezoelectric thin films for lead-free nano-generators, along with NBT films.

간이 신경 인지기능 국재화 검사의 개발 I : 고안

이영호,정효경,허시영,고영택,박병관,Lee, Young-Ho,Jung, Hyo-Kyung,Hoe, Si-Young,Koh, Young-Taek,Park, Byung-Kwan 대한수면의학회 1999 수면·정신생리 Vol.6 No.2

Recently, with increasing the number of patients with head injury and cerebrovascular accident, there has been an increasing need for the useful assessment tools of brain dysfunction and it's localization. With the advances in the neuroscience since the mid-1970s, particularly in the areas of neuroanatomical tracing, neuroimaging, and improved behavioraltest design, it has been possible to develop a more precise understanding and localization of brain dysfunction. However, these equipments are not readily available in the private clinics and too expensive to use as a screening tool to all suspected patients with brain dysfunction. Although several screening tests such as Mini-Mental States Examination(MMSE) or Brief Cognitive Rating Scale(BCRS) are simple in use and useful for the brief assessment of brain dysfunction, these are also limited in using for localization of brain dysfunction because of their simplicity. With increasing need of the assessment tool which is able to localize the dysfunction more precisely in the clinical practice, we planned to develop the new assessment tool, the Bedside Neurocognitive Function Localization Test(BNLT) which is suitable for this purpose. The BNLT was designed to be utilized for localizing brain dysfunction effectively and readily in the clinical practice. We introduced the whole process of designing the BNLT in this manuscript.

식사 행동의 신경학 : 섭취에 중점을 맞추어서

이영호,Lee, Young Ho 대한생물정신의학회 1998 생물정신의학 Vol.5 No.2

In mordern society, nutritional and appetite disorders occur in epidemic proportions and are serious health harzards. Obesity and diabetes affect over 30% of American population, while eating disorders, such as anorexia nervosa and bulimia nervosa occur in a growing number of adolescences and young adults. The changes in various sociocultural aspects with the introduction of Westernized culture have had the effect of increasing the risk of same problems in Korea. Disorderd eating patterns are a primary symptom of numerous psychiatric disorders and loss of appetite and cachexia, during illness or in the elderly, preclude proper medical treatment for restoring good health or preserving life. Increased understanding of the systems of the body and brain, related to energy and nutrient balance, may help us to treatment and ultimately prevent these commom disorders. In this review, the author highlights the psychobiological mechanisms or factors which are associated with eating behavior, especially in the view of intake psychobiology. This review would be concentrated on 1) the theoretical concepts and theories of eating behavior ; 2) the psychobiological determinants of food intake ; and 3) the psychobiological control of eating behavior.

하와이 이민과 '인하공과대학'의 설립

이영호,Lee, Young-Ho 한국기록학회 2001 기록학연구 Vol.0 No.3

'Inha University' (Inha Institute of Technology) was founded on April 1954. The establishment of Inha University has several special meanings. First, I tried to examine the establishing process of Inha University in the context of emigrations and nationalist movements. Inha University was established to commemorate the 50th anniversary of emigration to Hawaii, with the seed money of $150,000 which came from the sale of 'Korean Christian Institute' in Hawaii. Korean Christian Institute had taken charge of teaching the children of Korean residents in Hawaii. Rhee Syhngman, the fist president of Republic Korea was the leader in founding Korean Christian Institute and Inha University, but behind him there were donations of both Korean residents in Hawaii and common Korean people of the 1950's. The establishment of Inha University has a nation-wide and national meaning in that the spirit of nationalist movements in Hawaii and donations of Korean people at home and abroad were linked together. Second, I tried to examine the economic and educational policies after the liberation in 1945. In the 1950's Korea planned to set up self-supporting economy with the aid of America. Accordingly, the educational policy had to be considered in view of economic independence, too. 'Inha Institute of Technology' was the result of these national economic and educational demands. Consequently Inha Institute of Technology took a special position of carrying out national policies with the intervention and protection of the Government, including the president Rhee Syungman in person, even though it was neither national not public but private college. Third, I tried to examine the local history of Incheon. How did Inha Institute of Technology come to be built in Incheon? That's because the emigrant ships departed from Incheon. For those Korean emigrants, it is quite natural that the city of Incheon has a symbolic and commemorative meaning. In addition, Incheon is a port city neighboring the capital Seoul and has 'Seoul-Incheon Industrial Complex' in it. Graduates from Inha Institute of Technology were expected to act as competent scientists and technical leaders of that complex. Really Inha Institute of Technology trained many a good technicians with short-term courses and re-educated them after. The history of university has been usually underestimated as that of mere institution. In dealing with the history of Inha University as an example, I tried to re-examine the history of university in the context of Korean history and to emphasize the importance of keeping any all records relating universities.

생체 리듬과 음식 섭취

이영호,Lee, Young-Ho 대한수면의학회 1998 수면·정신생리 Vol.5 No.1

Living organisms are influenced by many external rhythms and they have adapted their physiology to periodically changing conditions. These adaptive strategies are controlled by endogenous innate programs of behavior and physiology which are determined by external signals ("Zeitgeber"). There are many biological rhythms, each with its own characteristic functional adaptation. Among them, the presence of endogenous time control of feeding and drinking becomes obvious. There are increasing evidences that the control of food intake, food selection, and drinking are regulated by the endogenous rhythms including a circadian rhythm. However, there have been many restrictions in understanding the endogenous control of food intake itself and its mechanism. To broaden our know ledges of the endogenous time control of feeding and drinking, the author reviwed the characteristics of the endogenous timing for food intake, the influence of circadian pacemakers and food-entrainable oscillators, the interaction between the circadian control and the external and internal conditions in the control of food intake, the conseqences of feeding, the circadian control of food selection, and the biological cycles in energy balance.

콘크리트 충진 FRP 합성교각 내진성능에 관한 실험 연구

이영호,Lee. Young Ho 한국방재학회 2012 한국방재학회논문집 Vol.12 No.4

본 논문은 2가지 형태의 콘크리트 충진 FRP 합성교각의 내진성능을 검증하기 위하여 실험을 실시하였다. 첫 번째 형태의 FRP 합성교각은 FRP를 횡보강 철근 및 거푸집 대용으로 사용한 현장타설식 CFFT 교각이고, 다른 하나는 FRP로 보강된 모듈을 적층하는 프리캐스트식 CFFT 교각이다. 두가지 형태 모두 FRP에 의한 횡보강의 증가에 따라 압축강도가 향상되며 피복 콘크리트의 손상을 막아주어 내진성능을 향상시킬 수 있다. 본 연구에서는 두가지 형식의 CFFT 교각의 내진성능 검증을 위하여 4개의 실험체에 대하여 실험을 실시하였고, 파괴형상, 반복 횡하중에 대한 연성능력을 평가하고 각 시험체의 강성저하에 따른 감쇠비, 강성 저감과 소산에너지 등을 비교하였다. This paper presents an experimental investigation of seismic performance for two types of concrete filled FRP column using such as concept. The first type is the CFFT with cast-in-place concrete filled within a FRP tube playing the role of form and lateral confinement. The second type is the precast CFFT column using FRP as lateral confinement. Both methods provide improved compressive strength according to the increase of transverse reinforcement and prevent spalling even after failure of the filling concrete confined by FRP, which allows advantageously slow and gradual loss of bearing capacity. Four scale-down specimens were conducted by quasi-static cyclic loading test. The capacities of ductility for cyclic loading was evaluated and the damping ratio, the stiffness reduction and energy dissipation of each test specimen were compared.

심인성 소양증환자와 만성 담마진환자의 스트레스지각과 통제소재 및 우울증상과의 관계

이영호,고대관,한기석,정영조,김용상,임성춘,남기흠,김중호,Lee, Young-Ho,Ko, Dae-Kwan,Han, Ki-Seok,Chung, Young-Cho,Kim, Yong-Sang,Lim, Sung-Chun,Nam, Ki-Heum,Kim, Chung-Ho 한국정신신체의학회 1995 정신신체의학 Vol.3 No.2

For investigating a disease specific psychological mechanism in various dermatological disorders, we tried to explore the difference in correlation among stress perception, locus of control as a coping strategy, depressive symptoms and pruritic symptoms in the patients with psychological pruritis and chronic urticaria. The subjects were composed of 32 patients with psychol-ogical pruritis and 67 patients with chronic urticaria(subject group), and 25 patients with organic pruritis and 59 patient with major depression(control group). Global assesment of recent stress scale(GARS), I-E locus of control scale, Beck Depression Inventory(BDI) and medical college of wisconsin center pain follow up questionnaire were used for assesement. The results were as follows: 1) There were a significant positive correlation between stress perception and depressive symptom in patients with psychological pruritis, chronic urticaria, and major depression but not hi organic pruritis. 2) In relationship between locus of control and depressive symptom, patients with psychological pruritis, organic pruritis, and major depression except chronic ruticaria showed a significant negative correlation. 3) For intensity and pattern of pruritis, there were positive relations with depressive symptom and stress perception only in patients with chronic urticaria. Above results indicate that stress perception and locus of contorl may play a significant role in the formation of psychological and dermatological symptoms in psychological pruitis and chronic urticaria. But the mechanisms of these processes are different in either disorder.