• 한국영어학회지:영어학
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• 제2권4호
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• pp.471-494
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• 2002

May(1985) argued that the regress problem of antecedent-contained deletion (ACD) construction could be resolved easily by positing QR. But the proposal has some conceptual and empirical problems. To resolve the problems of QR account on ACD, Hornstein(1994) suggested a new approach viz. LF A-movement approach. In the Minimalist framework, an object raises to the [Spec, Agro] to check the accusative case. Through this movement, the regress problem can be resolved naturally without QR. But the LF A-movement account has the same conceptual problem as the QR approach. In addition to the conceptual problem, it has also empirical problems which were pointed out by Kennedy(1997). To solve the problems, I propose that the object raise to [Spec Agro] overtly as Koizumi(1993, 1995) and Lasnik(1995) insisted. In addition to the proposal, I adopt another assumption that only the copy of a quantifier could become a variable by the vehicle change, which was suggested by Brody(1995). With the above proposals, the unnatural QR operation could be dispensed with and the conceptual and empirical problems which were made concerning the LF A-movement approach could be resolved.

• 대한의용생체공학회:의공학회지
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• 제27권6호
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• pp.370-375
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• 2006

The purpose of this work is to predict the systolic blood pressure (BP) during exercise from pulse transit time (PTT) for warning of possible danger. PTT was calculated as the time between R-peak of ECG and the peak of differential photoplethysmograph (PPG). For the PTT-BP model, we used regress equations from previous studies and 3 kinds of new models combining linear and nonlinear regress equation. The model parameters were estimated with the data measured under low to middle intensity exercise, and then was tested with the data measured under high intensity exercise. Predicted BP values after high intensity exercise were compared with those measured by cuff-type sphygmomanometer. The results showed that the error between measured and predicted values were acceptable for the monitoring BP. We tested PTT-BP models 1 month after the identification without further calibration. Models could predict the BP and the errors between measured and predicted BP were about 5mmHg. The suggested system is expected to be helpful in recognizing any danger during exercise.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 가을 학술발표회 논문집
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• pp.350-355
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• 1994

This study is aimed at the experimental investigation of the influence of the structural parameters such as concrete cover, width of specimen and bar size on the dowel action of reinforcing bari in high strength concrete members. Based on the proper combination of these parameter, a total of 46 specimens has been cast for fc'= 500 ㎏/㎠ and another 46 specimens for fc'= 700 ㎏/㎠, and cured at the laboratory. Comparative analyses have been made for the parametric contribution to the dowel strength from the test results, and a regress equation has been suggested.

• Journal of Chest Surgery
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• 제15권3호
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• pp.321-324
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• 1982

Patent ductus arteriosus is not uncommon congenital heart disease. Patent ductus arteriosus associated with mitral regurgitation is very rare, however especially nonrheumatic in character. In such a case, a ligation of ductus arteriosus alone makes it regress the symptoms and signs of mitral regurgitation. Till recent days, we have experienced 10 cases of patent ductus arteriosus with mitral regurgitation who had been undergone a ligation of ductus arteriosus alone with good clinical benefits. In 5 cases among above patients, we have followed up the patients from 4 months to 6 years. Herewith, we report these cases with review of some literatures.

• Journal of Chest Surgery
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• 제29권6호
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• pp.655-659
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• 1996

Primary cardiac tumors are known to be rare. Of the benign primary tumors, rhabdomyoma predominates in neonates and infants. Tuberous sclerosis is found in hall of the patients with rhabdomyomas. Rhabdomyomas demonstrate benign pathological characteristics and may regress spontaneously that resection of the intracavitary obstructing portion of these tumors are recommended. We performed resection of intraatrial rhabdomyoma which had been obstructing mitral valve orifice and caused heart failure in a neonate. Postoperatively, fungal endocarditis developed and after 3 days, rapid growth and extension of the vegetation in the aorta obstructed the flow through the ascending aorta and resulted in hemodynamic deterioration.

• 응용통계연구
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• 제10권2호
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• pp.293-308
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• 1997

일변량 분할 역회귀 방법은 일반화 회귀모형에서 효과적인 차원축약방향과 공간을 추정하는 방법이다. 본 논문에서는 두 일반화 회귀모형을 동시에 고려하여 효과적인 차원축약방향과 공간을 추정하는 방법으로 이변량 분할 역회귀를 제안한다. 이러한 이변량 분할 역회귀 방법은 모형식이 선형, 이차형, 삼차형, 비선형 등의 여러 모형식에서 효과적인 차원축약방향을 추정하며, 일변량 분할 역회귀에 비하여 모형에 존재하는 오차에 크게 영향을 받지 않고 효과적인 차원축약방향을 추정한다. 특히 모형식이 대칭의 이차형인 경우에 일변량 분할 역회귀 방법이 효과적인 차원축약방향을 추정하지 못하는 문제를 해결할 수 있다.

• 한국지형학회지
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• 제20권3호
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• pp.27-39
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• 2013

본 논문은 남부 동해안의 5개 지역을 대상으로 최근 약 30년 동안 해안선의 장기적인 변화 경향을 파악하고, 중부 및 남부 동해안 연구를 종합하여, 동해안 해안선의 장기적인 변화 경향과 그 요인을 분석하였다. DSAS를 이용하여 해안선 변화량을 계산한 결과, 망양정 지역은 평균 28.9m, 조사 지역은 평균 6.4m 해안선이 후퇴하였고, 고래불 지역은 평균 25.0m, 대진 지역은 평균 10.6m, 봉길 지역은 평균 18.8m 해안선이 전진하였다. 동해안의 해안선 변화 경향을 종합하면, 1) 모든 지역 내에서 해안선은 전진과 후퇴 구역이 반복적으로 나타나고 있다. 2) 최근에 건설되거나 증축된 방파제와 접한 남쪽 구역에서는 해안선이 전진하였는데, 이는 북류하는 연안류의 영향으로 판단된다. 3) 해수욕장으로 이용되는 구역에서는 상대적으로 큰 해안선 후퇴 경향을 보인다. 4) 하천의 하구에서는 하천 상류 지역에서의 퇴적물 공급량 변화에 따라 해안선의 전진 및 후퇴가 다양하게 나타난다.

• 한국정보전자통신기술학회논문지
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• 제16권5호
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• pp.325-330
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• 2023

본 논문은 머신러닝을 활용하여 교량 데이터 설계 시 기존 엔지니어의 구조해석결과 또는 경험 및 주관에 따라 슬래브 두께를 예측하여 왔던 프로세스를 머신러닝 기법을 적용하여 디지털 기반 의사결정이 가능하도록 제시한다. 본 연구에서는 슬래브 두께 선정을 구조해석 외에 머신러닝 기법을 활용하여 엔지니어에게 가이드 값을 제공하게 함으로써 신뢰성 있는 설계 환경을 구축하고자 한다. 교량 데이터 중 가장 많은 비중을 차지하고 있는 거더교를 기준으로 상부구조물 중 슬래브 두께를 예측하기 위한 예측모델 프로세스를 정의 하였다. 각 프로세스 별 예측 값을 산출하기 위하여 다양한 머신러닝 모델 (Linear Regress, Decision Tree, Random Forest, Muliti-layer Perceptron)을 프로세스별 경합하여 최적의 모델을 도출하였다. 본 연구를 통해 기존 구조해석을 통해서만 슬래브 두께 예측을 하였던 영역에 머신러닝 기법의 적용 가능성을 확인하였으며 정확도 또한 95.4%를 도출하였다, 향후 프로세스 확장 및 데이터를 지속 확보하여 예측모델 정확도를 향상시킨다면 공사 환경에 머신러닝 모델이 지속 활용될 수 있을 것으로 기대된다.

• 기술혁신학회지
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• 제4권3호
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• pp.369-382
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• 2001

In this research, the world top steel companies' technical changes were measured by the nonparametric Malmquist index. Steel industry's production frontier which was composed of multiple inputs and multiple outputs was defined by using real data of the companies from 1986 to 1998, and then the variability of technical progress(or regress) was analyzed during that period. The dynamics of individual steel companies\` technical changes, periodical technical changes, and each country's technical chanties were explained. A matrix which was based on technical chanties, technical efficiency changes, and scale efficiency changes was designed to assist to find out current position and In build up future strategies. This research results will be an valuable input to the early stage of formulating competitive strategy because the technical core capability is an important source of the each companies's competitiveness.

• 한국임상약학회지
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• 제20권3호
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• pp.242-247
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• 2010

Controlling inappropriate antibiotics prescribing for acute upper respiratory infections(URI) is a very important for prudent use of antibiotics and resistance control. Health Insurance Review and Assessment Service (HIRA) introduced Prescribing Evaluation Program and publicly reported antibiotics prescribing rate for URI of each health institution. We performed segmented regression analysis of interrupted time series to estimate the effect of public report on antibiotics prescribing rate using national health insurance claims data. The results indicate that just before the public report period, clinics' monthly antibiotics prescribing rate for URI was 66.7%. Right after the public report, the estimated antibiotics prescribing rate dropped abruptly by 12.3%p. There was no significant changes in month-to-month trend in the prescribing rate before and after the intervention.