• 지역연구
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• 제6권1호
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• pp.11-38
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• 1990

The purpose of this thesis is, first to present the spatial division of labor in Korea and its mechanism, and second, to elucidate the organic integral relation between local labor market and local community by studing the mechanism that the spatial division of labor is projected into the individual lacal labor marker, and reproduction of labor force process in this local labor market. According to this purpose, the theoretical frame of this analysis is done, the positive analysis is made and Kumi is choosed as its analysis case area. The main data is from 'Survey Report on Manufacturing Idustry Wage Conditions' published by Minimum Wage Council, Ministry of Labour and from the questionnaires and interview on textile industry and electric electronics industry firms in Kumi Export Industrial Estate. The following are the results of this study. 1. The mechanism of spatial division of labor in Korea, seen through the employment structure index, is accelerating the regional discrimination by fixing the regional hierarchisation between Seoul (or Seoul Metropolitan Area as expanded Seoul) and other areas. But it is also developing highly the regional employment structure at the level of technical division of labor, since the spatial division of labor in Korea is leaded by large firms and influenced by the policy for regional development. 2. Local labor market is formed in Kumi area and its delimitation is Kumi city. The employment structure of Kumi local labor market is occupying lower hierarchy division at management hierachical level and occupying upper hierarchy division at the level of technical division of labor, and brand plants of large firs are determinating and dominating this emplogment structure. These bdranch plants of large firs are forming more favorable and stabel labor marker than locally controlled ploants in Kumi local labor market. But the reproduction of labor force process in Kumi local labor market is not fully carried out and leaked into central city, therefore Kumi is now becoming an unstable local community, suffering from large movement of population. This is because Kumi local labor market is found not for itself, but by the state policy and externally controlled plants of large firms, and therefore no potentiality to control and to absorb the exterior influences is built in Kumi local labor market. 3. The case firms A, B have spatial division of labor between decision-making function and production function, and between upper management hierachical labor force and lower management hierachical labor force in internal labor market.

• 대한원격탐사학회지
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• 제34권2_1호
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• pp.191-201
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• 2018

본 연구에서는 한반도 서울의 연세대학교에서 Multi-Axis Differential Optical Absorption Spectroscopy(MAX-DOAS)장비로부터 산출된 원시자료를 이용하여 처음으로 최적추정(Optimal Estimation; OE)을 사용하여 오존전량 및 오존의 대류권 프로파일을 산출하였다. 오존전량 및 오존의 대류권 프로파일을 산출하기 위하여 최적추정을 통하여 MAX-DOAS자료의 광학두께 피팅을 수행하였다. 광학두께 피팅은 MAX-DOAS 장비로부터 각각의 기기 고도각별로 관측된 값을 천정각에서 관측된 값으로 나누어 계산된 자료를 통하여 수행하였다. 오존전량은 2017년 5월 23일 오전(08:13)과 오후(17:55)에 각각 375.4와 412.6 DU로 산출되었다. 오존의 대류권 프로파일(<10 km)은참값 오존존데와 비교하여 약 5% 이내의 오차로 산출되었다. 하지만 10 km 이상의 높은 고도에서는 산출 에러가 커져 10% 이상 과대추정 하는 것으로 산출되었다. MAX-DOAS 자료의 스펙트럼 피팅에 의한 오차는 오전과 오후에 각각 16.8%와 19.1%로 계산되었다. 본 연구에서 제시한 방법은 지상관측 기반의 초분광 UV 센서를 이용하여 오존전량과 대류권 오존 프로파일을 산출하는데 유용하게 사용될 수 있다.

• 한국물환경학회지
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• 제30권4호
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• pp.409-417
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• 2014

Spatial prediction methods have been useful to determine the variability of water quality in space and time due to difficulties in collecting spatial data across extensive spaces such as watershed. This study compares two kriging methods in predicting BOD concentration on the unmonitored sites in the Geum River Watershed and to assess its predictive performance by leave-one-out cross validation. This study has shown that cokriging method can make better predictions of BOD concentration than ordinary kriging method across the Geum River Watershed. Challenges for the application of cokriging on the spatial prediction of surface water quality involve the comparison of network-distance-based relationship and euclidean-distance-based relationship for the improvement in the predictive performance.

• 대한조선학회논문집
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• 제61권3호
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• pp.143-151
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• 2024

In this study, we present a mapping framework for 3D spatial reconstruction of digital twin model using navigation and perception sensors mounted on an Autonomous Surface Vehicle (ASV). For improving the level of realism of digital twin models, 3D spatial information should be reconstructed as a digitalized spatial model and integrated with the components and system models of the ASV. In particular, for the 3D spatial reconstruction, color and 3D point cloud data which acquired from a camera and a LiDAR sensors corresponding to the navigation information at the specific time are required to map without minimizing the noise. To ensure clear and accurate reconstruction of the acquired data in the proposed mapping framework, a image preprocessing was designed to enhance the brightness of low-light images, and a preprocessing for 3D point cloud data was included to filter out unnecessary data. Subsequently, a point matching process between consecutive 3D point cloud data was conducted using the Generalized Iterative Closest Point (G-ICP) approach, and the color information was mapped with the matched 3D point cloud data. The feasibility of the proposed mapping framework was validated through a field data set acquired from field experiments in a inland water environment, and its results were described.

• Imaging Science in Dentistry
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• 제49권2호
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• pp.97-102
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• 2019

Purpose: This study was conducted to evaluate the effect of different spatial resolutions of a photostimulable phosphor plate (PSP) radiography system on the detection of proximal caries lesions. Materials and Methods: Forty-five extracted human permanent teeth were radiographed using a PSP system (VistaScan Perio Plus) and scanned at the 4 resolutions (10 lp/mm, 20 lp/mm, 25 lp/mm, and 40 lp/mm) available in the system. Three independent examiners scored the images for the presence and absence of proximal caries lesions using a 5-point scale. The presence or absence of caries was confirmed by histological sections of the examined teeth (defined as the gold standard). Intra- and inter-observer reproducibility was calculated by the weighted kappa test. One-way analysis of variance with the post hoc Tukey test was used to compare the area under the receiver operating characteristic curve for the classifications made with each resolution. Results: For the detection of enamel lesions, the spatial resolution of 10 lp/mm was significantly superior to the other resolutions. However, the spatial resolution did not affect the detection of caries lesions in dentin (P>0.05). Conclusion: Spatial resolution may influence the accuracy of the detection of incipient caries lesions in radiographs with PSP plates. Images with low spatial resolution seem to be more appropriate for this purpose.

• ETRI Journal
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• 제26권1호
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• pp.45-47
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• 2004

A resolution enhancement method for estimating the direction-of-arrival (DOA) of signals is presented. The proposed method is by virtually expanding a real array into virtual arrays and then averaging the spatial spectrum of the virtual arrays, each of which has a different aperture size. Superior DOA resolutions are shown in comparison with the standard algorithm, MUltiple SIgnal Classification (MUSIC), for incoherent signals incident on a uniform circular array.

• 대한원격탐사학회지
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• 제38권6_3호
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• pp.1847-1859
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• 2022

북한에서 발생한 산불은 비무장지대 등으로 남하하는 경우 우리나라에 직·간접적인 영향을 줄 수 있다. 이에 본 연구는 정보 접근불능 지역인 북한의 산불위험정보를 획득하기 위하여 Local Data Assimilation and Prediction System (LDAPS) 기상자료 기반의 지역 최적화된 산불위험지수 Forest Fire Danger Index (FFDI)를 산출하고, 2022년 4월 북한 고성군과 철원군의 산불 사례에 적용하였다. 그 결과 발화일 당시 FFDI가 각각 위험등급 Extreme과 Severe 구간에 해당하여 적합성을 확인하였다. 또한 산불 발생 전후의 위험도지도와 토양수분지도를 정성적으로 비교한 결과 상호 관계성을 파악하였으며, 향후 토양수분, 표준화강수지수(Standardized Precipitation Index, SPI), 식생수분지수(Normalized Difference Water Index, NDWI) 등을 결합하는 방식으로 산불발생위험지수의 개선이 필요하다.

• 대한원격탐사학회지
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• 제39권6_1호
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• pp.1477-1482
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• 2023

본 연구는 2012년부터 2021년까지 동북아시아 해역에서 발생한 해수고온현상을 Communication, Ocean, and Meteorological Satellite (COMS)/Meteorological Imager sensor (MI)와 GEO-KOMPSAT-2A (GK-2A)/Advanced Meteorological Imager sensor (AMI) 정지궤도 위성 해수면온도 자료를 통해 탐지하였다. 특히 2018년 이후 및 2020년에 해수고온현상의 빈도와 강도가 눈에 띄게 증가하였음을 발견하였다. Optimal Interpolation Sea Surface Temperature (OISST) 자료와 천리안위성 자료를 활용한 T-test 통계적 검증은 해수면 온도가 통계학적으로 유의미하게 상승했다는 것을 확인시켜 주었으며, 이는 기후 변화의 직접적 영향이라는 결론을 뒷받침한다. 이 연구 결과는 해수고온현상의 지속적인 모니터링과 정밀한 분석의 중요성을 강조한다. 복잡한 지형과 다양한 기후 조건을 가진 동북아시아에서 이루어진 연구는 글로벌 기후 변화가 지역 환경에 미치는 영향을 이해하는 데 있어 중요한 통찰을 제공한다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.81-81
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• 2004

• ETRI Journal
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• 제43권5호
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• pp.941-949
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• 2021

In this study, a spatial spectrum method is proposed to cope with the pilot spoofing attack (PSA) problem by exploiting the of uplink-downlink channel reciprocity in time-division-duplex multiple-input multiple-output systems. First, the spoofing attack in the uplink stage is detected by a threshold derived from the predefined false alarm based on the estimated spatial spectrum. When the PSA occurs, the transmitter (That is Alice) can detect either one or two spatial spectrum peaks. Then, the legitimate user (That is Bob) and Eve are recognized in the downlink stage via the channel reciprocity property based on the difference between the spatial spectra if PSA occurs. This way, the presence of Eve and the direction of arrival of Eve and Bob can be identified at the transmitter end. Because noise is suppressed by a spatial spectrum, the detection performance is reliable even for low signal-noise ratios and a short training length. Consequently, Bob can use beamforming to transmit secure information during the data transmission stage. Theoretical analysis and numerical simulations are performed to evaluate the performance of the proposed scheme compared with conventional methods.