• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1509_1510
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• 2009

This paper presents the design and simulation results of ohmic contact RF MEMS silicon switch with a high isolation at high frequencies along with the position of a contact part, initial off-state and intermediate off-state including the state where a contact part is placed right over a signal line of coplanar waveguide (CPW). The ohmic contact part is connected with comb drives made of high resistivity single crystalline silicon. The released contact part is $30{\mu}m$ apart from the edge of signal line on the glass substrate along the lateral direction (x-direction) at initial off-state. The electrostatic force of the comb electrode creates the x-directional movement thus initial state is converted to the intermediate off-state. The initial off-state of the switch results in isolations of -31 dB, -24 dB and reflections of -0.45 dB, -0.67 dB at 50 GHz and 110 GHz, respectively. It shows the isolation degradation when the contact part moves right over the signal line of CPW like an initial off-state of a conventional MEMS switch. The isolations and reflections are -31 dB, -24 dB and -0.50 dB, -1.31 dB at 50 GHz and 110 GHz, respectively at the intermediate off-state.

• Journal of Sasang Constitutional Medicine
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• v.21 no.3
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• pp.107-121
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• 2009

1. Objectives: We aimed to know what are different in physiological and pathological symptoms associated with health state according to Sasang Constitution in women 2. Methods: We recruited 338 women between 10 and 80, excluding individuals who have physically or psychologically serious disease, or women in pregnancy among Korean population in Traditional Korea Clinics. We used CRF(Case Report Form, C-2009-002439) as measurement of physiological and pathological symptoms and SF-36 (Short Form-36) as measurement of health state We analyzed association between physiological and pathological symptoms and health state with Two-way ANOVA 3. Results: There are 9 different symptoms associated with health state, such as digestion state, uncomfortable problem in belly, indigestion in bad condition, abnormal sweat, night sweat, clean in urine, no problem in urine, feel heavy in chest according to Sasang constitution. 4. Conclusions: Physiological and pathological symptoms are associated with health state and some symptoms associated with health state are different according to Sasang Constitution in women.

• Journal of Advanced Navigation Technology
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• v.15 no.4
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• pp.536-542
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• 2011

This paper considers the performance of tightly-coupled GPS/INS integration using total-state UKF (Unscented Kalman Filter) for multipath error. In the city canyon there exists large multipath error and it may happen that GPS satellites are seen only three or less. For these situations simulations show that the performance of total-state UKF is better than that of EKF in the presence of multipath error. The total-state UKF shows robust performance for multipath error.

• The Korean Journal of Food And Nutrition
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• v.18 no.3
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• pp.229-240
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• 2005

This quantitative study was investigated to examine the relationship between severity of state-trait anxiety and disordered eating patterns in some university students. This study used a cross-sectional study design. Total 347 students participated in this study (88 male and 259 female) among three universities. The assessment of eating disorder was conducted by Eating Attitudes Test (EAT-26), a score of >or=20 identified individuals likely to have an eating disorder, including anorexia nervosa and bulimia nervosa. Scores of healthy dietary behaviors were obtained by self-assessment instrument on healthy diet scale(20-item questionnaire), and severity of state-trait anxiety was calculated by state-trait anxiety inventory(Total 40- item questionnaire). In groups for each state anxiety and trait anxiety, there were divided between 50 percentile point of cumulatived scores of state anxiety and trait anxiety in all subjects. Linear regression analysis showed overall significant difference between dietary patterns(anorexia nervosa and healthy dietary behaviors) and severity of state-trait anxiety in all sex. Our results indicated that severity of state-trait anxiety may marked eating disorder symptomatology on dimensions of eating disorder prevention.

• Journal of the Korean Society for Library and Information Science
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• v.41 no.2
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• pp.203-218
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• 2007

The purpose of this study was to investigate the state library services in the United States in order to consider what services are needed for regional libraries in Korea. The data were collected from library statistics and library web pages. The analyses particularly focused on examining the residental service and library service of state libraries. The analyses revealed that the state libraries provide funds, services, and training to local libraries, but the service levels are varied among states. State libraries provide state historical information and genealogy information to residential users, and focus on the information needs for handicapped people. Based upon the analysis of U.S. state libraries, Korea regional libraries would provide services different from local public libraries. Also, regional libraries would be operated based upon the regional characteristics.

• Journal of Sasang Constitutional Medicine
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• v.20 no.2
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• pp.11-20
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• 2008

1. Objectives The objective of this paper is to understand on treatment of in critical state patients based on the text book of Sasang Constitutional Medicine. We expect this study can be helpful in treating the critical state patients. 2. Methods The study is mainly based on the bibliographical research on the "Dongyisoosebowon" and on the "Principle of dosing for patient in critical state". 3. Results and conclusions Lee je-ma suggested a health scale which people can measure his health grade from a standard healthy state to severe diseases. We investigated the treatment of 'critical state' patients according to his scale. Lee je-ma also confirmed the standard dose of herbs and how to take herbs in compliance with the state which each patient in. We tried to find a rules of treating the critical state patients based on the text "Dongyisoosebowon" and we suggested brief principles in treating patients.

• Proceedings of the SAREK Conference
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• 2008.06a
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• pp.282-287
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• 2008

Identification of steady-state is the first step in developing a fault detection and diagnosis (FDD) system. In a complete FDD system, the steady-state detector will be included as a module in a self-learning algorithm which enables the working system's reference model to "tune" itself to its particular installation. In this study, a steady-state detector of a residential air conditioner based on moving windows was designed. Seven representing measurements were selected as key features for steady-state detection. The optimized moving window size and the feature thresholds was suggested through startup transient test and no-fault steady-state test. Performance of the steady-state detector was verified during indoor load change test. From the research, the general methodology to design a moving window steady-state detector was provided for vapor compression applications.

• Journal of Electrical Engineering and Technology
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• v.13 no.5
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• pp.1927-1934
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• 2018

In this paper, we studied the state of charge (SOC) estimation algorithm of a high-capacity lithium secondary battery for electric vehicles (EVs) considering temperature characteristics. Nonlinear characteristics of high-capacity lithium secondary batteries are represented by differential equations in the mathematical form and expressed by the state space equation through battery modeling to extract the characteristic parameters of the lithium secondary battery. Charging and discharging equipment were used to perform characteristic tests for the extraction of parameters of lithium secondary batteries at various temperatures. An extended Kalman filter (EKF) algorithm, a state observer, was used to estimate the state of the battery. The battery capacity and internal resistance of the high-capacity lithium secondary battery were investigated through battery modeling. The proposed modeling was applied to the battery pack for EVs to estimate the state of the battery. We confirmed the feasibility of the proposed study by comparing the estimated SOC values and the SOC values from the experiment. The proposed method using the EKF is expected to be highly applicable in estimating the state of the high-capacity rechargeable lithium battery pack for electric vehicles.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.51 no.1
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• pp.29-36
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• 2002

It is required that the current state of system should be Precisely monitored for efficient and safe operation of the subway power system and it is an important Problem to secure the high quality data for state estimation. The current state of subway power system is estimated by using data transmitted to control center from every measuring instrument. The high accuracy and trust can be maintained if the measured data have a high quality. But it is difficult to estimate the accurate state of system because of the noises in transmitted data and the inaccuracy of measuring instruments. So the object is to reduce the difference between the real values and the measured values in order to improve considerably the inaccuracy due to Instrumental errors and transmission noises using the state estimation method. In this paper, we proposes a new state estimation to estimate the accurate state of the subway power system from the measured values of a Sang-In station in Daegu subway and consider the possibility of application to the real subway power system. on the basis of that. The simulation results show to make sure of the possibility to apply to the real system usefully.

• KIPS Transactions on Software and Data Engineering
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• v.2 no.1
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• pp.19-26
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• 2013

To improve the reliability and quality of software system, many studies of the testing based on state-transition diagram have been in progress. Existing studies tried to solve the complexity problem of state-transition diagram. But the development of test case demands the better way to derive and manage the state diagram with low complexity. In this paper, the STMT(State-Transition Mapping Tree) is proposed to decrease the complexity of state diagram without changing or loosing the original state or transition information. Comparing with other methods, the proposed method turns out to be less complex.