• The korean journal of orthodontics
• /
• v.22 no.1
• /
• pp.17-30
• /
• 1992

Since 1984, many patients have been treated with Multiloop Edgewise Archwire (MEAW) Technique and diagnosed with ODI (Overbite Depth Indicator) and APDI (Anteroposterior Dysplasia Indicator) by the authors. 234 samples of them were selected randomly for the statistical analysis (age, sex, Angle's classification, treatment period, extraction, ODI etc.). Especially, ODI was analysed statistically and its application methods were reviewed. The results and conclusions were as follows: 1. On the 150 patients with normal overbite, the mean values of Class I, II, III malocclusion were $67.5^{\circ}$, $72.2^{\circ}$ and $59.0^{\circ}$. They were significantly different on the level of p < 0.01. 2. In normal overbite samples, ODI decreased with the increase of APDI and the correlation coefficient was -0.54. It seems that this result reflects the characteristics of AB to mandibular plane angle. 3. The regression equation was Y = - 0.57X + 114.64, where X is APDI and Y is ODI. In cases of small or large APDI, it seems to be absurd that the patient's ODI is compared with the mean ODI to differentiate diagnostically the open bite or deep bite tendency from the normal.

• Journal of radiological science and technology
• /
• v.42 no.6
• /
• pp.413-422
• /
• 2019

Heavy ion particle, represented carbon ion, radiotherapy is currently most advanced radiation therapy technique. Conventional radiation therapy has made remarkable changes over a relatively short period of time and leading various developments such as intensity modulated radiation therapy, 4D radiation therapy, image guided radiation therapy, and high precisional therapy. However, the biological and physical superiority of particle radiation, represented by Bragg peak, can give the maximum dose to tumor and minimal dose to surrounding normal tissues in the treatment of cancers in various areas surrounded by radiation-sensitive normal tissues. However, despite these advantages, there are some limitations and factors to consider. First, there is not enough evidence, such as large-scale randomized, prospective phase III trials, for the clinical application. Secondly, additional studies are needed to establish a very limited number of treatment facilities, uncertainty about the demand for heavy particle treatment, parallel with convetional radiotherapy or indications. In addition, Bragg peak of the heavy particles can greatly reduce the dose to the normal tissues front and behind the tumor compared to the photon or protons. High precision and accuracy are needed for treatment planning and treatment, especially for lungs or livers with large respiratory movements. Currently, the introduction of the heavy particle therapy device is in progress, and therefore, it is expected that more research will be active.

• The Journal of the Korea Contents Association
• /
• v.16 no.11
• /
• pp.321-329
• /
• 2016

The purpose of this study is to analyze the impact of R&D investment on productivity growth of the Korean Economy in the New Normal Era. To be specific, this study focuses on the impact of R&D capital, other capitals, and total factor productivity(TFP) on the labor productivity during the three periods: 1970-2014, 1970-1997, and 1999-2014. We found out that the change of the intensity in the R&D capital and other capitals significantly impacted on the change of the labor productivity in Korea. In particular, the estimated coefficients of these variables are higher after the period of the IMF financial crisis than before the crisis. We also estimated the marginal productivity of R&D capital investment in terms of the TFP growth. The estimated coefficients of the variables showed stronger effects after the period of the IMF financial crisis than before the crisis. As a result, the increase of R&D investment has been greatly impacted on the growth of the total factor productivity(TFP) after the IMF financial crisis in Korea.

• Journal of Oral Medicine and Pain
• /
• v.22 no.2
• /
• pp.373-381
• /
• 1997

The anxiety and depression level of new outpatients wert studied clinically by means of The Hospital Anxiety and Depression Scale(HAD). 64 males and 97 females were subjected at local dental clinic and also 6l male and 91 females were studied at the Dept. of Oral Medicine, PNUH, during period from 1996 to 1997 The obtained results were as follows : 1. Anxiety disorder was 17.76% in the new dental outpatients of university hospital and 13.66% in the local dental Clinic find depression disorder was 7.23% In the University hospital and 3.72% in the local dental clinic. 2. Mean values of depression and anxiety level were within normal range. 3. Anxiety level in female was significantly higher than that in male at the local dental clinic (p<0.05). 4. Anxiety and depression level in university hospital outpatients decreased in order of clerk, housewife and student(p<0.01). 5. The outpatients of university hospital with lower education level showed more anxious and depressed. 6. Anxiety and depression of unmarried group of new outpatients in university hospital was higher than that of married group. Through the above results, proper treatment plans will be demanded In the dental procedure, because psychologic 야sorders as anxiety and depression were included in the 25% of new outpatients of university hospital and 17% at local dental clinic.

• The Transactions of the Korean Institute of Electrical Engineers
• /
• v.37 no.12
• /
• pp.894-902
• /
• 1988

In this paper, a method for the design of robust adaptive controller using the heuristic rules of industrial engineers is presented. This scheme works on the basis of heuristic rules and includes a supervisor, a system identifier and a detuner. The supervisor detects onsetting instability based on the analysis of the amplitude and the trend of error signal, also selects running controllers. Upon detecting instability, the controller is switched to a PID algorithm and run recursively until stability is restored. Simultaneously, new input / output data is gathered and the system identifier runs to get critical sensitivity (kc) and critical period(tc). Based on the new values(kc, tc), a GPC controller is redesigned and normal GPC is finally run. The algorithm described in this paper belongs to the supervised adaptive control category with a limited use of heuristic rules. Finally, we show the robust of this scheme by simulated example.

• International Area Studies Review
• /
• v.20 no.4
• /
• pp.73-90
• /
• 2016

Recently China's economy has been entered a new normal state with mid-speed growth. Along with the new normal state, Chinese government presented new development strategies. Among them, Beijing-Tianjin-Hebei Integration Strategy(BTH) has become the primary policy on the list of national economic development plan, and the BTH is expected to be the new model of regional development in China. With this background, this article firstly explains the concept and development process of the BTH, secondly presents the state of regional economies, lastly introduces some challenges ahead in the process of the BTH. The challenges, including industry structure adjustment problem, poverty belt in Hebei, environment problem and the distribution of functions of Beijing as a capital, are difficult to solve in a short period. It is needed more cooperative measures between central and local governments to cope with the challenges.

• Korean Journal of Health Education and Promotion
• /
• v.8 no.2
• /
• pp.24-33
• /
• 1991

This study was conducted to assess to the knowledge and educational needs of pregnant women relating to antepartum, delivery, postpartum periods, and to identify the variables which influenced their knowledge and educational needs. The study subjects were 282 postpartum women who had delivered fullterm normal babies without any complications. Data were collected from women those who were not more than two days after delivery at general hospitals, 3 maternal child health care centers and 4 midwife's offices in Pusan using questionnaire method from Feb. 1. 1991 to Mar. 20. 1991. The results of this study are as follows 1. Relating to the antepartum period, the knowledge about the time when the sex of fetus was fixed was low, and relating to delivery, the knowledge about the method reducing labor pain was low. 2. Relating to the antepartum period, the educational needs about child rearing was high, and relating to delivery, the educational needs about newborn baby were high. Relating to the postpartum period, the educational needs about emergency care of new born baby were high. 3. There were statistically significant differences in total educational needs by educational level(P<.01), duration of marriage (P<.01), and number of pregnancy(P<.05). 4. There were positive correlation between the total knowledge and educational level and negative correlations between the total knowledge and duration of marriage and age.

• The Transactions of the Korean Institute of Electrical Engineers D
• /
• v.50 no.11
• /
• pp.541-549
• /
• 2001

The term 'silent period(SP)' refers to a transitory, relative or absolute decrease electromyography(EMG) activity, evoked in the midst of an otherwise sustained contraction. Masseteric SP is elicited by a tap on the chin during isometric contraction of masseter muscle. In this paper, a new EMG signal generation model including SP in masseter muscle is proposed. This work is based on the anatomical structure of trigeminal nerve system that related on temporomandibular joint(TMJ) dysfunction. And it was verified by comparing the real EMG signals including SP in masseter muscle to the simulated signals by the proposed model. Through this studies, it was shown that SP has relation to variable neurophysiological phenomena. A proposed model is based on the control system theory and DSP(Digital Signal Processing) theory, and was simulated using MATLAB simulink. As a result, the proposed SP model generated EMG signals which are similar to real EMG signal including normal SP and an abnormal extended SP. This model can be applied to the diagnosis of TMJ dysfunction and can effectively explain the origin of extended SP.

• Current Optics and Photonics
• /
• v.5 no.3
• /
• pp.243-249
• /
• 2021

In this paper, the sensing characteristics of a double cladding fiber (DCF) long-period fiber grating (LPFG) to the surrounding refractive index (SRI) are studied. The outer cladding of the DCF plays the role of the overlay, thus, the mode transition (MT) phenomenon of DCF can be induced by etching the outer cladding radius instead of coating overlays. The response characteristics of the effective refractive index (ERI) of the cladding mode to the outer cladding radius are analyzed. It is found that in the MT range, the change rate of ERIs of cladding modes is relatively larger than that for other ranges. Further, based on the features of the mode transition region (MTR), the phase-matching curve of the 11^th cladding mode is investigated, and the response of the DCF-LPFG to the SRI is characterized by the change of wavelength intervals between the dual peaks under different outer cladding radii. The numerical simulation results show that the SRI sensitivity is greatly improved, which is available to 3484.0 nm/RIU with the fitting degree 0.998 in the SRI range of 1.33-1.37. The proposed DCF-LPFG can provide new theoretical support for designing the DCF-LPFG refractive index sensor with excellent performances of sensitivity, linearity and structure.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
• /
• v.18 no.1
• /
• pp.22-25
• /
• 2007

Background and Objectives: Biomedical signals have been usually used for the diagnosis of the laryngeal function such as speech, electroglottograph(EGG), airflow and other signals. But, in most cases these signals were analysed separately. Here, we propose a new interchannel parameter Glottal Closure Delay Ratio(GCDR) which is estimated from speech and EGG measured simultaneously. Materials and Method: Speech and EGG signal were recorded simultaneously from 13 normal subjects, 39 patients. The patients' data included 16 polyps and 23 vocal folds palsy. Time difference between glottal closing instance on EGG and the first maximum peak on speech in a pitch period was calculated. Glottal closing instance was defined as the maximum peak on the first derivative of EGG signal(dEGG). Results: The standard deviation and jitter were calculated using 20-30 GCDRs extracted from each data, and they are significant different between normal and vocal fold paralysis group. Conclusion: The GCDR may be the first index reflecting speech and EGG characteristics and the perturbation of this parameter was significant different between normal and vocal fold paralysis group.