• 한국경제지리학회지
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• 제13권3호
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• pp.457-469
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• 2010

본 연구의 목적은 중력모형을 이용하여 서비스업에 대한 지역간 교역계수를 추정하는 것이다. 중력모형을 이용하여 지역간 교역규모를 추정할 때 가장 중요한 점은 바로 종속변수인 지역간 교역자료와 독립변수인 지역간 인력요인 및 지역간 거리를 나타내는데 적용되는 대리변수의 선정이라고 할 수 있다. 따라서 본 연구에서는 중력모형을 이용하여 서비스업의 지역간 교역규모를 추정할 때 적용 가능한 다양한 대리변수에 따라 네 가지 유형의 모형을 제시하고 이중에서 통계적 설명력이 가장 높은 모형을 선정하고자 하였다. 분석결과, 종속변수로 지역산업연관표의 16개 지역간 서비스업 교역량 자료를 적용하고 독립변수로 이출지역의 서비스업 생산액 자료와 이입지역의 인구규모 그리고 지역간 공간거리를 적용한 모형의 설명력이 가장 높은 것으로 나타났다. 따라서 본 연구는 광역자치단체보다 작은 경제단위의 지역을 대상으로 지역산업연관표를 작성하거나 또는 최신의 지역산업연관표를 작성하기 위해 비조사적 방법을 적용하는데 있어 보다 정확한 지역간 교역자료 구축을 위한 방법을 제시하였다는데 의의가 있다고 할 수 있겠다.

• 보건행정학회지
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• 제24권1호
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• pp.92-99
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• 2014

Background: Korea's primary care clinics are seeking increase in consultation fees by expanding supply within the frame of the health insurance system, but inequality of physician income between regions and individuals is exacerbating. The purpose of this study lies in analyzing the distribution of patients of primary care clinics, their specialized field, and the degree of inequality between medical fee income according to region. Data was acquired from the Health Insurance Review and Assessment Service on charged bills made by clinic-size medical institutions from 2008 to 2011. Methods: By comparing the outpatient number per clinic according to the clinic's specialized field, results showed that ophthalmology, otolaryngology, dermatology, orthopedics, and internal medicine showed high numbers whereas plastic surgery, neuropsychiatry, cardiothoracic surgery had fewer outpatients. The number of outpatients for clinic according to region showed Chuncheonnam-do, Jeju-do, Gangwon-do, Chungcheongbuk-do, Ulsan to have higher numbers of outpatients. For those four years, clinics in the Seoul area had a rather lower number. Results: As a result of comparing the decile hierarchy distribution ratio between specialized fields according to primary care clinics income from National Health Insurance, the inequality degree showed that obstetrics and gynecology and general medicine were each 0.130, 0.280 for the decile distribution ratio, which was the highest degree of inequality within the specialized field. Their Gini coefficient were also relatively high at 0.691, 0.528 respectively. On the other hand, the decile distribution ratio for otolaryngology and orthopedics were 0.510, 0.468, respectively, while their Gini coefficient each at 0.318, 0.314 makes their inequality degree relatively lower than other fields. Conclusion: This study is limited in that the data used was the health insurance charges submitted by clinics, which does not provide total information of the doctors' income. However, because most clinics are largely dependant on their income to come from health insurance reimbursements. Therefore, the results of this study can be used effectively. In the future, research that includes data on non-covered service income should be conducted to closely examine policy plans with a new medical fee policy which can resolve the medical fee income inequality issue between clinics as well as revitalize primary medical care.

• 수산해양기술연구
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• 제21권1호
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• pp.28-34
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• 1985

액체식 자기컴퍼스 방위지시부의 제진특성을 인공자장발생장치내에서 수평자장의 세기에 따라, 컴퍼스종류 및 컴퍼스액의 점성계수별로 측정한 결과는 다음과 같다. 1. 컴퍼스종류별 제진특성은, 실험용 컴퍼스(A, B, C, D, E) 모두 수평자장의 세기가 강할수록 주기는 짧으며, 과행각은 커지는 경향을 나타내었다. 2. 실험용 컴퍼스 모두 지자기의 수평자장이 0.39 gauss인 적도부근에 가까울수록 자기컴퍼스 카아드는 비교적 빨리 안정되고, 평균자장이 아주 약한 극지인 0.03 gauss에서는 주기는 45초 이상으로 길어져 불안정하였다. 3. 컴퍼스종류별 제요소를 ISO의 성능기준과 비교한 결과, A컴퍼스가 그 성능이 가장 양호하여, 자침의 자기능률과 카아드의 직경이 자기컴퍼스 방위 지시부의 제진특성에 큰 영향을 미침을 알 수 있었다. 4. 컴퍼스액의 점성계수별 제진특성은 점성계수가 크고 수평자장이 강할수록 진폭은 커지며, 주기는 짧아지는 경향을 나타내었다. 5. 컴퍼스종류별 제진곡선의 주요점까지의 경과시간(t 하(i))은 수평자장(H)의 -0.71승에, 과행각(P 하(i))은 0.22승에 비례하였으며, 컴퍼스액의 점성계수에 따른 제진곡선의 주요점까지의 경과시간(t 하(i))은 수평자장(H)의 -0.80승에, 과행각(P 하(i))은 0.13~1.08승에 비례하였다.

• 한국산학기술학회논문지
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• 제22권4호
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• pp.220-227
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• 2021

비운송 지중구조물인 전력구와 공동구는 대부분 철근 콘크리트 구조물로서 공용기간이 경과함에 따라 탄산화에 의한 열화로 내구성이 저하된다. 특히, 전력구 및 공동구는 용도별, 지역별로 탄산화 속도가 상이하므로 개별적인 유지관리를 위해서는 탄산화 실측 데이터에 기반한 예측 모델이 요구된다. 본 연구에서는 노후화 된 전력구 및 공동구와 같이 기존 비운송 지중구조물에 대한 탄산화 예측 모델을 개발하였다. 탄산화 예측 모델 개발을 위해 안전점검에서 확보한 실측 데이터를 기반으로 다중회귀분석 및 심층신경망 기법을 활용하였다. 다중회귀분석에서 종속 변수인 탄산화 속도계수 결정을 위해 독립 변수로서 구조물, 지역, 측정 위치, 시공 유형, 측정 부재, 콘크리트 강도를 선정하였으며, 다중회귀 예측 모델의 수정결정계수(Ra2)는 0.67로 분석되었다. 심층신경망을 이용한 비운송 지중구조물의 탄산화 예측 모델결정계수(R2)는 0.82로 나타났으며, 비교대상 모델보다 우수한 예측 성능을 보였다. 심층신경망을 이용한 비운송 지중구조물의 탄산화 예측 모델은 콘크리트 강도에 기초한 것으로, 본 연구의 결과가 노후화 된 전력구 및 공동구에 대한 탄산화 유지보수 최적 시기 결정 및 예방적 유지관리 방법론에 기여되길 기대한다.

• 대한기계학회논문집B
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• 제22권1호
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• pp.50-60
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• 1998

As a method to develop an enhanced heat transfer fluid, the fine particles of a phase-change material were mixed with a conventional heat transfer fluid. Paraffin, which can be obtained easily in domestic market, was used for the phase-change material and water was used as a carrier fluid. Fine liquid particles of paraffin were formed in water as an emulsion by using an emulsifier, and they were cooled rapidly to become solid particle, resulting in paraffin slurry. The average diameter of produced solid particles was inversely proportional to the amount of the added emulsifier, which was theoretically proved. The produced paraffin slurry was tested thermally in heat transfer test section having a constant-heat-flux boundary condition. The test section was made of a circular stainless-steel pipe, which was directly heated by the power supply having a maximum of 50 Volts-500 Amperes. DSC(Differential scanning calorimeter) tests showed that two kinds of phase change were involved in the melting of paraffin, and it was explained in two different ways. A five- region-melting model was developed by extending the conventional three-region-melting model, and was used to obtain the local bulk mean temperatures of paraffin slurry in the heating test section. The local heat transfer coefficient showed a maximum where the bulk mean temperature of the paraffin slurry reached at the melting temperature of paraffin.

• 대한기계학회논문집B
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• 제22권6호
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• pp.849-859
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• 1998

The heat generated in an induction motor is mostly dissipated through the frame. The study on the heat transfer characteristics of a newly manufactured finless TEFC(Totally Enclosed Fan Cooled) induction motor showed/that it had an unsuitable structure in view of the heat transfer. The angle of the cooling air flow was very large and the ribs disturbed the air flow and partially generated the wake region on the frame. In the wake region the temperature was very high. Thus the heat transfer coefficients were lower than those of the frame with fins. Also was investigated the heat transfer characteristics of the motor frame by installing various guide vanes in the fan-side end cap. An optimum heat transfer case was found and the average heat transfer coefficient of the frame was 70% higher and the average coil temperature measured by the resistance method was 9 deg. C lower than that of the frame which had no guide vanes.

• Journal of Advanced Marine Engineering and Technology
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• 제33권2호
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• pp.244-251
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• 2009

Porous media have especially large surface area per volume, which contain complex fluid passage. If porous media can be applied to cool a CPU or an electronic device with large heat dissipation, it could result in heat transfer enhancement due to the enlargement of the heat transfer area and the flow disturbance. This study is aimed to identify the heat transfer and pressure drop characteristics of high-porosity metal foams in a horizontal channel. Experiment is performed with the various heat flux, velocity and pore density conditions. Permeabilities, which is deduced from Non-Darcy flow model, become lower with increasing pore density. Nusselt number also decreases with higher pore density. High pore density with same porosity case shows higher pressure loss due to the increase of surface area per unit volume. The fiction factor decreases rapidly with increase of Reynolds number in Darcy flow region. However, it converges to a constant value of the Ergun coefficient in Non-Darcy flow region.

• 한국산업융합학회 논문집
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• 제20권5호
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• pp.431-439
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• 2017

Since the power transmission line(PTL) passes through the high mountain and heavy snowfall region, it is necessary to keep the stability of the PTL. In this study, PTL is modeled as a mass-spring-damper system by using RecurDyn. The lumped mass model is verified by calculated from the simulation comparing the deflection analysis according to the sag and tension. In order to analyze the dynamic behavior of PTL, a damping coefficient for a multi-body model is derived by using the free vibration test and Rayleigh damping theory. Sleet jump simulation according to the region is performed. The maximum jump height, icing sag and amount of jump are confirmed. Also, the amount of jump and the reaction force at the supporting point according to the tension and load of ice are analyzed, respectively. As a result, it is noted that the amount of jump and reaction force are influenced more by the load of ice than by the tension of PTL.

• The Journal of Korean Physical Therapy
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• 제1권1호
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• pp.73-82
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• 1989

The purpose of this study was to contribute to the relatively neglected area of out -patient satisfaction with physical therapy service by measuring and determining the factors affecting patient satisfaction in the Andong region. One hundred and forty-five subjects (81 males and 64 females) at 11 facilities with a mean age of 39.2 years (SD=16.2) responded to the satisfaction questionnaire. Each questionnaire contained a set of demographic questions and 19 patient satisfaction items. Cronbach's alpha test of reliability was used as the measure of internal consistency . The satisfaction scale had a good reliability coefficient : Cronbach's alpha=.8688. The average satisfaction score (minimum score=19, maximum score=95) was 75.4 ranging from 38 to 90. Respondent variables including sex, education, marital status, religion, medical security, average monthly income, and number of physical therapy out-patient department treatment visits were analyzed by t-test, ANOVA, and ANCOVA. Satisfaction with the service was largely unrelated to mallets of sex, education, occupation, or other demographic variables. However, marital status, age, average monthly income, and number of treatment visits in the out-patient department were significantly related to patient satisfaction. The analysis presented here could be replicatied with a larger sample in other areas. Other factors such as physical therapist availability, physical therapist competence, accessibility, waiting time, and atmosphere of the treatment area should be considered in further studies.

• 한국유체기계학회 논문집
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• 제14권1호
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• pp.48-54
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• 2011

The effect of channel cutback on three-dimensional flow fields and aerodynamic losses downstream of a cavity squealer tip has been investigated in a turbine rotor cascade for the squealer rim height-to-chord ratio and tip gap height-to-chord ratio of $h_{st}/c$ = 5.51% and h/c = 2.0% respectively. The cutback length-to-camber ratio is changed to be $CB/c_c$ = 0.0, 0.1, 0.2 and 0.3. The results show that longer cutback delivers not only stronger secondary flow but also higher aerodynamic loss in the tip leakage vortex region, meanwhile it leads to lower aerodynamic loss in the passage vortex region. The discharge of cavity fluid through the cutback opening provides a beneficial effect in the reduction of aerodynamic loss, whereas there also exists a side effect of aerodynamic loss increase due to local wider tip gap near the trailing edge. With increasing $CB/c_c$ from 0.0 to 0.3, the aerodynamic loss coefficient mass-averaged all over the measurement plane tends to increase slightly.