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이종적층 LTCC 기술을 이용한 GSM 대역 BPF 설계
고정호,이상노,육종관,박한규 한국전자파학회 2003 한국전자파학회논문지 Vol.14 No.9
본 논문에서는 LTCC 기술을 이용한 다중기판 2단 LC 대역통과 필터를 제안하였다. 이 필터는 서로 다른 유전율을 갖는 세라믹 재료를 사용하였다. 인덕터는 손실과 기생성분을 감소시키기 위하여 저유전율의 재료에 설계되었다. 반면에 커패시터는 단면적을 감쇄시키기 위하여 고유전율의 재료에 설계되었다. 본 논문에서 제안된 대역통과 필터의 전체크기는 2.5${\times}$2.5${\times}$l.4mm$^3$이며 949 MHz의 중심주파수 및 3.5 dB의 삽입손실과 118MHz의 대역폭을 갖는다. 성능은 각각의 LC 공진기 사이의 커플링 커패시터에 의하여 조절하였다. A multilayer two-stage LC bandpass filter using low-temperature cofired-ceramic(LTCC) is proposed in this paper. The proposed bandpass filter is composed of two ceramic substrates with different dielectric constant instead of single ceramic material from top to bottom layer. Inductive elements are designed in a low permitivity ceramic layer to reduce parasitic effects and loss, while capacitive elements are designed in a high permitivity ceramic layer for size reduction. The proposed filter has 950 MHz center &equency, 118 MHz tractional bandwidth, and 3.5 dB insertion loss. And, the total size of this filter is 2.5${\times}$2.5${\times}$l.4mm$^3$. The performance of filter is analyzed by changing coupling capacitance between each resonator.
유전개념의 역사적 변천과 학생들의 유전개념 발달의 비교 연구
고정호,길학균,이길재 韓國生物敎育學會 1997 생물교육 Vol.25 No.2
The nature of heredity was identified by many efforts of ancient and recent researchers: Hipocrates, Aristoteles, 19C's Mendel and 20C's Wanton and Crick. In the present day, however, in teaching and learning their thoughts and impressions in science is negligent. Many researchers have noted that a similarity exists between the historical transitions of scientific concepts and learner's cognitive development. Therefore many researchers insisted on using their ideas, knowledge, and concept's of developmental process in science teaching-learning. The purpose of this study is to find out the existence of similarities between the historical transitions process of related genetic concepts and the developmental process of individual genetic concepts among the different school years of students. For the purpose, historical transitions process of related genetic concepts was investigated using various literature cited. Then the student's concepts was investigated about related reproduction, development and heredity concepts by using open-ended questionnaires. The results showed that there is the existence of similarities between the historical transitions process of related genetic concepts and the developmental process of learner's concepts. The results of this research will help the selection of learning contents and the design of teaching-learning for teachers. Using this kind of results, teachers can lead students try have correct scientific concepts and scientific attitudes.
고정호,송윤미,박주현,박재영,최윤호 대한가정의학회 2012 Korean Journal of Family Medicine Vol.33 No.3
Background: Blood lipid profiles have been suggested to be a risk factor for osteoporosis. However, the association between lipid profiles and bone mineral density (BMD) is still unclear. This study aimed to evaluate an association between blood lipid profiles and BMD through both a cross-sectional and a longitudinal study. Methods: Study subjects were 958 postmenopausal Korean women who have repeatedly undertaken laboratory tests and BMD measurements at lumbar spine and femur neck with an interval of 7.1 years. The associations between lipid profiles and BMD were examined using Spearman correlation analysis with an adjustment for age, smoking, alcohol drinking,physical activity, body mass index, and follow-up duration. Results: Lumbar spine BMD was not associated with total cholesterol (TC), low density lipoprotein cholesterol (LDL-C),and high density lipoprotein cholesterol (HLD-C) regardless of when the measurement was performed. In an analysis using data measured at the beginning of the study, femur neck BMD was not associated with TC and LDL-C. However,femur neck BMD showed weak but significantly positive correlation with HDL-C (correlation coefficient, 0.077; 95%confidence interval, 0.005 to 0.149). When the analysis was repeated with data measured at the end of the follow-up, there was no significant correlation between femur neck BMD and any lipid profile. In addition, change in femur neck BMD during follow-up was not associated with the change in lipid profiles. Conclusion: Although further study with a consideration of calcium intake and osteoporosis medication seems necessary,this study found no association between serum lipid profiles and BMD in postmenopausal Korean women.
Photoperiodic Responses of Kalanchoe and Chrysanthemum to Radiation by an Infrared Lamp
고정호,이상복,정병룡 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.6
This experiment was conducted to investigate the effect of a low intensity infrared radiation on the growth and photoperiodic responses of Kalanchoe blossfeldiana ‘Kaluna’ and ‘Taos’, and Dendranthema grandiflorum ‘Lemon Eye’ grown in growth chambers. In the first experiment, uniformly-rooted cuttings of ‘Kaluna’ and ‘Lemon Eye’ were selected and transplanted to 10 cm pots. After a week, pots were transferred from greenhouse to three environmentcontrolled growth chambers. All chambers were maintained at 25 ± 1℃ and 70% RH with an 8 hours photoperiod (760 µmol·m-2·s-1), provided by high pressure sodium and white fluorescent lamps. During the night period one chamber was left unlit (darkness), while the second and third ones were lit with an incandescent lamp (10 µmol·m-2·s-1) or an infrared lamp (15 µmol·m-2·s-1), respectively. Shoot length, root length, stem diameter, number of flowers,number of branches, fresh weight, and dry weight were measured after eight weeks. Flowering occurred on plants maintained in the unlit darkness and under an incandescent lamp during the night period, while only vegetative growth was observed under an infrared lamp. In the second experiment, cuttings of uniformly-rooted ‘Taos’ and ‘Lemon Eye’ were selected and transferred from the greenhouse to three environment-controlled growth chambers with the same environment setting as in the first experiment at a week after potting. During the night period one chamber was left unlit (darkness), the second and third ones were lit with an incandescent or an infrared heating lamp, both at a 0.3 µmol·m-2·s-1 PPFD level. After nine weeks, flowering in all treatments was observed, but was slightly delayed under an incandescent and an infrared heating lamp. Because both the incandescent lamp and the infrared lamp slightly delayed flowering in these two species, a more detailed experiment is necessary to find out at which intensity and light quality inhibits the flowering of these species.
고정호,강상승,전은아,이강수,Go, Jeong-Ho,Gang, Sang-Seung,Jeon, Eun-A,Lee, Gang-Su 한국정보처리학회 2000 정보처리논문지 Vol.7 No.6
When a receiver of ciphertext message can not decrypt a message because he has lost his private-key, the private-key of receiver and session-key of the message should be recovered. In this paper, we developed an Encapsulation based Key Recovery System (EKRS). EKRS is a new key encapsulation based key recovery system which is characterized by secretly choice of KRA, randomized target keys. n-way recovery type, and useful for commercial key recovery. EKRS is formally specified by a pictorial model, an Extended Cryptographic Timed Petri Net (ECTPN). Secure information flow and reachability of a session-key are verified by using reachability graph of ECTPN. EKRS, executing over a Public Key Infrastructure, can be used as a security solution in Web based applications such as CALS, EC an EDI.