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자동차 내부 센서간의 통신 및 네트워킹을 위한 다중 반송파 DS-CDMA의 성능 분석
박태윤,최재호,Park, Tae-Yoon,Choi, Jae-Ho 한국컴퓨터산업학회 2004 컴퓨터産業敎育學會論文誌 Vol.5 No.5
다중 반송파 기반의 DS/CDMA 다중 접속 및 데이터 전송 기법은 여러 종류의 모바일 통신과 무선 통신 분야에 적용 가능한 것으로 알려지고 있다. 특히, 다양한 센서를 탑재한 차세대 지능형 자동차에서 이들 무선 센서 간의 통신 및 네트워킹을 수행함에 있어서 MC-DS/CDMA 기술은 가장 먼저 고려 될 수 있는 기법중의 하나이다. 본 논문에서는 자동차 내부의 센서간의 통신 및 네트워킹을 위해서 부심벌 단위로 순환 접두부를 삽입하는 새로운 방식의 MC-DS/CDMA 기법을 제안하고 우리가 제안한 기법의 간섭 잡음 제한 성능을 주파수 밴드 사용 효율, 코드화 이득 및 동시 접속 센서의 개수 등의 파라미터를 대상으로 비교 평가하였다. 차량의내부는 일반적인 모바일 통신 환경에 비하여 채널 지연 확산이 매우 작은 경우이므로 본 논문에서 제안한 기법은 다수의 무선 센서가 동시에 작동하는 지능형 차량의 센서 간의 통신과 네트워킹에 효과적인 적용이 가능할 것으로 사료된다. The multicarrier direct sequence code-division (MC-DS/CDMA) is a well-known multiple access and data transmission scheme that is applicable for various mobile and wireless communications. Particularly for modern, smart vehicles equipped with multiple sensors, MC-DS/CDMA is one of the possible means for giving the sensors to get connected one another for sending and receiving messages and control information. For intra-vehicalur communicaiton and networking applications, we have proposed a novel MC-DS/CDMA multiple access and data transmission scheme incorporating a new idea of inserting sub-symbol based cyclic prefixes for compromising inter-symbol interference. In the performance investigation of our MC-DS/CDMA, we have looked into system performances related to bandwidth utiltzation, coding gain, and multiple number of sensors. Since the channel delay is comparatively shorter inside of vehicle than any other general mobile channels, the proposed scheme can be a successful candidate for networking wireless sensors simultaneously operting in an intelligent vehicle.
Prediction of Anthracofibrosis Based on Clinico-Radiographic Findings
박태윤,김덕겸,허은영,정희순,진광남 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.2
Purpose: Because anthracofibrosis (AF) is associated with tuberculosis (TB), detection of AF is clinically relevant in Korea, a TB endemic region. We thus sought to develop and validate a predictive model for AF using clinical radiographic data. Materials and Methods: Between January 1, 2008 and March 31, 2014, 3849 adult patients who underwent bronchoscopies were retrospectively included from an observational registry. We dichotomized patients based on the presence (n=167) or absence (n=242) of AF. After analyzing their clinico-radiographic characteristics, a logistic prediction model was developed. An area under the curve (AUC) was drawn using the weighted score in logistic regression model. To evaluate the degree of overfitting of the predictivemodel, a 5-fold cross-validation procedure was performed. Results: In multivariate logistic regression, clinical findings such as age >70 years, female gender, active TB, and computed tomographyfindings including atelectasis, stenosis, bronchial wall thickening, enlarged and calcified lymph nodes were significant diagnostic predictors for AF. The weighed score had an AUC of 0.939 [95% confidence interval (CI)=0.911–0.960], similar to the AUC obtained from internal validation (AUC=0.926, 95% CI=0.896–0.949). Conclusion: The prediction model may be helpful for predicting AF based only on clinical and radiographic findings. However, further external validation is necessary.
박태윤,정재우,장주영,최재철,신종욱,박인원,최병휘,김재열 대한결핵및호흡기학회 2018 Tuberculosis and Respiratory Diseases Vol.81 No.2
Background: Eosinophilia is well recognized in specific conditions. The objective of the present study was to determine clinico-radiologic characteristics of eosinophilia and changes in prevalence over 10 years in recipients of private health screening program at a tertiary hospital in Korea. Methods: Data of private health screening program recipients at the health promotion center of Chung-Ang University Hospital from 2004 to 2013 were collected. Health-related questionnaires and laboratory findings of private health screening program with possible relation with eosinophilia were reviewed. Results of enzyme-linked immunosorbent assay (ELISA) for parasite, chest computed tomography, and pulmonary function test were also reviewed. Results: The cumulative prevalence of eosinophilia was 4.0% (1,963 of 48,928). Prevalence of eosinophilia showed a decreased trend from 2004 to 2013. Most cases (96.6%) had mild degree of eosinophilia. Eosinophilic subjects were older and male-predominant. They showed lower levels of forced expiratory volume in 1 second (FEV1%), forced vital capacity (FVC%), and FEV1/FVC than those without eosinophilia. Eosinophilic subjects showed higher positive rate for common parasite in ELISA than those without eosinophilia. On radiologic findings, consolidation and ground glass opacities were positively associated with the degree of eosinophilia. When eosinophil was classified based on severity, statistically significant correlation between the severity of eosinophil and radiologic abnormalities was found. Conclusion: Eosinophilia is uncommon in healthy population. It usually occurs at a mild degree. Eosinophilic patients have more radiologic abnormalities compared to those without eosinophilia. Such radiologic abnormalities are associated with the severity of eosinophilia.
박태윤,Jang Won Sohn,최덕근 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.4
The upper part of the Sesong Formation of the Taebaek Group, Taebaeksan Basin, Korea, is known to contain the Kaolishania Zone which can be equated to the Kaolishania Zone of North China. Silicified trilobite sclerites were recovered from six horizons of the upper part of the Sesong Formation at the Sagundari section, which include a total of thirteen polymerid species: i.e., Shirakiella elongata Kobayashi, 1935, Shirakiella sp. 1, Taishania? sp. 1, Acanthometopus sp. 1, Pagodia sp. cf. P. spina Qian, 1994, Kaolishania granulosa Kobayashi, 1933, Gumunsoia triangularis gen. et sp. nov., Gumunsoia sp. 1, kaolishaniid genus and species indeterminate 1, Elaphraella? taebaeksanensis Park and Choi, 2012, Elaphraella microforma Lu and Qian, 1983, Elaphraella nodus (Qian, 1994), and Lingyuanaspis sp. The occurrence of Kaolishania suggests that the studied interval may be part of the Kaolishania Zone. However, Kaolishania occurs only from the lowermost horizon, and the full stratigraphic range of Kaolishania is unknown at present. Accordingly, the studied interval is provisionally called the Kaolishania fauna. The uppermost interval of this Kaolishania fauna produces Acanthometopus sp. 1, and thus can be correlated with the Acanthometopus Zone in Northeast China, which is underlain by the Kaolishania Zone