• 한국운동역학회지
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• 제17권2호
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• pp.41-50
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• 2007

The purpose of this study was to examine the effects of Task-oriented training on the balance, lapse time and MVC(Maximum Voluntary Contraction) of CVA(cerebral vascular accident) patients. The active balance equipment was used to measure of the static balance, lapse time and task-oriented training. The EMG technique was used to record muscle activitie of affected side of gluteus medius and vastus medialis. The raw EMG data were filtered with band pass filter (60Hz) to remove artifacts and then low pass filtered (20Hz) to find the linear envelope which resemble muscle tension curve. The experiment had been conducted at the department of physical therapy in J hospital in M city during 8weeks. The thirty patients experienced the stroke were participated: training group (15), control group (15). They were ambulatory with or without an assistive device. They were assessed on central perturbation(mm) in the static balance, lapse time(s) and MVC test(mV). The data were analyzed using repeated measured ANOVA. The results were as follows: After Task-oriented training, central perturbation and lapse time was significantly differences in both groups(p<.001), and MVC in gluteus medius were no significant differences in both groups, but vastus medialis was significant differences in both groups (p<.001).

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2006년도 공동학술대회 논문집
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• pp.109-112
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• 2006

기존 상용 전기탐사장비의 한계는 간척지 갯벌 등 해성퇴적층 하부지반조사 적용이 매우 힘들거나, 불가능한 것으로 인지되어 왔다. 최근 전 세계적으로 해저면 또는 연안지역환경 전기탐사 필요성이 대두됨에 따라 자체개발 발전기 전원 5 Ampere 대전류 송신 전기탐사 현장적용이 광양만에서 확인된다. 항만관련 기반시설 연안투자는 지속 확대될 것으로 기존 탐사방법 지반조사에서 탈피하여 항만 교량, 해저터널, 해저 가스 층 등의 효과적 적용 가능성이 기대된다. 한편 조석변화를 고려한 대전류 전기 비저항탐사를 수위별로 시간대 측정하여 연약구역 효과를 비교 시도하였다. 대전류 송신은 탐사전선저항 길이를 고려한 덜 무거운 케이블 선택 설계가 현장야업 시 중요하다.

• Communications for Statistical Applications and Methods
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• 제28권5호
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• pp.447-462
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• 2021

In insurance, the surrender rate is an important variable that threatens the sustainability of insurers and determines the profitability of the contract. Unlike other actuarial assumptions that determine the cash flow of an insurance contract, however, it is characterized by endogenous variables such as people's economic, social, and subjective decisions. Therefore, a microscopic approach is required to identify and analyze the factors that determine the lapse rate. Specifically, micro-level characteristics including the individual, demographic, microeconomic, and household characteristics of policyholders are necessary for the analysis. In this study, we select panel survey data of Korean Retirement Income Study (KReIS) with many diverse dimensions to determine which variables have a decisive effect on the lapse and apply the lasso regularized regression model to analyze it empirically. As the data contain many missing values, they are imputed using the random forest method. Among the household variables, we find that the non-existence of old dependents, the existence of young dependents, and employed family members increase the surrender rate. Among the individual variables, divorce, non-urban residential areas, apartment type of housing, non-ownership of homes, and bad relationship with siblings increase the lapse rate. Finally, among the financial variables, low income, low expenditure, the existence of children that incur child care expenditure, not expecting to bequest from spouse, not holding public health insurance, and expecting to benefit from a retirement pension increase the lapse rate. Some of these findings are consistent with those in the literature.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2008년도 춘계 종합학술대회 논문집
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• pp.639-643
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• 2008

시간의 흐름에 따른 계절의 변화, 꽃의 개화 등은 장시간에 걸쳐 이루어지므로 시간을 압축하여 빠르게 볼 수 있도록 미속촬영을 한다. 이러한 미속촬영을 이용하여 장소, 화각, 시간 등 다양한 조건을 동일한 상태에서 정확한 시간 간격을 통해 촬영하는 기법을 인터벌 촬영이라 한다. 미속촬영 기법은 교육, 과학, 다큐, 미디어 매체 등 다양한 분야에서 널리 사용한다. 본 논문에서는 미속촬영 영상을 취득함에 있어 기존과 다르게 꽃과 같은 주 피사체를 제외한 불필요한 배경을 삭제와 조정을 통해 영상처리가 가능하도록 하여 실사촬영 영상을 2D 및 3D상에서 필요한 라이브러리 또는 영상데이터로 폭 넓게 응용이 가능하도록 하여 누구나 쉽고 간편하게 영상제작에 창조성을 부여 할 수 있도록 하는 미속촬영 영상의 배경처리 기법을 제안한다.

• 한국농림기상학회지
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• 제18권3호
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• pp.135-142
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• 2016

운량 기반 기온감률 추정모형을 이용하여 0600과 1500의 기온감률을 모의하고, 최저 및 최고기온 추정과정에 활용되었던 기존의 단일 기온감률($-6.5^{\circ}C/km$, $-9^{\circ}C/km$)에 비해 추정 기온감률이 0600, 1500 기온의 추정오차를 개선할 수 있는지 확인하였다. 경남 하동과 전남 구례, 광양 지역의 '하동 2 수위표' 집수역을 기온감률 추정기법의 실용성 평가 지역으로 선정하고, 이 집수역 내 기상관측지점 12곳의 0600, 1500 기온자료를 2015년 한 해에 대해 수집하였다. 또한 2015년의 기상청 하늘상태 초단기예보 5km 격자자료를 이용, 대상 집수역의 0600, 1500 운량(0~10) 공간평균값을 계산하여 기온감률을 추정하였다. 검증지점의 0600 기온 추정오차는 기존 기온감률을 적용한 경우 평균 ME $-0.39^{\circ}C$, RMSE $1.45^{\circ}C$ 였으나, 새로운 기온감률로 변경한 결과 ME $-0.19^{\circ}C$, RMSE $1.32^{\circ}C$로 개선되었으며, 맑은 날은 ME $-0.8^{\circ}C$에서 $-0.57^{\circ}C$로, RMSE는 $1.72^{\circ}C$에서 $1.42^{\circ}C$로 감소되었고 흐린 날은 ME $-0.17^{\circ}C$에서 $-0.06^{\circ}C$, RMSE $1.16^{\circ}C$에서 $1.01^{\circ}C$로 줄어들었다. 또한 1500 기온에서 기존의 단일 기온감률과 추정 기온감률의 적용결과를 비교하면 맑은 날은 기온 추정오차에 거의 차이가 없었지만, 흐린 날은 기존 ME $-0.69^{\circ}C$, RMSE $1.54^{\circ}C$에서 ME $-0.51^{\circ}C$, RMSE $1.19^{\circ}C$로 개선되었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.250-252
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• 2006

The land surface temperature (LST) can be defined as a weighted average temperature of components which constitute a pixel. The coefficients of split-window algorithm for MTSAT-1R were obtained by means of a statistical regression analysis from radiative transfer simulations using MODTRAN 4.0 for a wide range of atmospheric, satellite viewing angle (SVA) and lapse rate conditions. 6 types of atmospheric profile data imbedded in the MODTRAN 4 are used for the radiative transfer simulations. The RMSE is clearly larger on warm and humid profiles than cold and dry profiles, especially when the satellite viewing angle and lapse rate are large. The derivation of LST equations according to the atmospheric profiles clearly decreased the RMSE without regard to the SVA and lapse rate. The bias and RMSE are decreased as the more controls factors included. This preliminary result indicates that the characteristics of atmosphere, SVA and lapse rate should be included in the LST equation.

• 한국식품영양과학회지
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• 제30권2호
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• pp.199-203
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• 2001

Chopi, Zanthaxylum piperitum DC., has been used as natural spice traditionally in the Far East countries including Korea. This study was performed with the object of providing basic data, firstly for the decision of the appropriate harvesting time for traditional use of chopi and secondly for developing a new spice satisfying the national dietary custom from chopi as raw material. Concerning the conte수 and its change of the proximate composition, the content of moisture and crude protein decreased in all sample, while the content of fiber and ash tended to increased with the lapse of harvest time. The content of mineral elements tended to increase in every sample with the lapse of harvest time, and contents of K and P were higher than that of Ca, Na and Mg. Every sample showed the highest content of 15~16 components of total amino acids at the first period and the content decreased gradually with the lapse of harvest time. On the basis of the first period, every sample showed the highest content of aspartic acid, the lowest content of methionine and the trace of cysteine. Free amino acids increased considerably with the lapse of harvest time for peels of chopi and minchopi broth, while the amount for leaves increased on the contrary.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2007년도 공동학술대회 논문집
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• pp.241-244
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• 2007

Cement-grouts are injected into limestone cavities beneath the road in the project area, in order to improve strength and reduce permeability; the extent to which grout has penetrated in cavities need to be monitored in order to determined effectiveness of cement-grout. Geophysical approaches, offer great potential for monitoring the grout injection process in a fast and cost-effective way as well as showing whether the grout has successfully achieved the target. This paper presents the ability of surface electrical resistivity to investigate the verification of the grout placement. In order to image the cement-grout, time-lapse surface electrical resistivity surveys were conducted to compare electrical resistivity images before and after injection. Cement-grout was imaged as anomalies exhibiting low resistivity than the surrounding rocks. In accordance with field monitoring, laboratory study was also designed to monitor the resistivity changes of cement-grout specimens with time-lapse. Time-lapse laboratory measurements indicated that electrical methods are good tool to identify the grouted zone. Pre-and post grouting electrical images showed significant changes in subsurface resistivity at grouted zone. The study showed that electrical resistivity imaging technology can be a useful tool for detecting and evaluating changes in subsurface resistivity due to the injection of the grout.

• 대한원격탐사학회지
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• 제25권6호
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• pp.507-515
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• 2009

Land surface temperature (LST) is a key environmental variable in a wide range of applications, such as weather, climate, hydrology, and ecology. However, LST is one of the most difficult surface variables to observe regularly due to the strong spatio-temporal variations. So, we have developed the LST retrieval algorithm from COMS (Communication, Ocean and Meteorological Satellite) data through the radiative transfer simulations under various atmospheric profiles (TIGR data), satellite zenith angle (SZA), spectral emissivity, and surface lapse rate conditions using MODTRAN 4. However, the LST retrieval algorithm has a tendency to overestimate and underestimate the LST for surface inversion and superadiabatic conditions, respectively. To minimize the overestimation and underestimation of LST, we also developed day/night LST algorithms separately based on the surface lapse rate (local time) and recalculated the final LST by using the weighted sum of day/night LST. The analysis results showed that the quality of weighted LST of day/night algorithms is greatly improved compared to that of LST estimated by original algorithm regardless of the surface lapse rate, spectral emissivity difference (${\Delta}{\varepsilon}$) SZA, and atmospheric conditions. In general, the improvements are greatest when the surface lapse rate and ${\Delta}{\varepsilon}$ are negatively large (strong inversion conditions and less vegetated surface).

• 대한원격탐사학회지
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• 제22권5호
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• pp.385-388
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• 2006

The land surface temperature (LST) can be defined as a weighted average temperature of components which constitute a pixel. The coefficients of split-window algorithm for MTSAT-1R were obtained by means of a statistical regression analysis from radiative transfer simulations using MODTRAN 4.0 for a wide range of atmospheric, satellite viewing angle (SVA) and lapse rate conditions. 6 types of atmospheric profile data imbedded in the MODTRAN 4 are used for the radiative transfer simulations. The RMSE is clearly larger on warm and humid profiles than cold and dry profiles, especially when the satellite viewing angle and lapse rate are large. The derivation of LST equations according to the atmospheric profiles clearly decreased the RMSE without regard to the SVA and lapse rate. The bias and RMSE are decreased as the more controls factors included. This preliminary result indicates that the characteristics of atmosphere, SVA and lapse rate should be included in the LST equation.