• 대한수학회논문집
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• 제38권2호
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• pp.469-485
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• 2023

Let 𝓐 be a unital Banach *-algebra and 𝓜 be a unital *-𝓐-bimodule. If W is a left separating point of 𝓜, we show that every *-derivable mapping at W is a Jordan derivation, and every *-left derivable mapping at W is a Jordan left derivation under the condition W𝓐 = 𝓐W. Moreover we give a complete description of linear mappings 𝛿 and 𝜏 from 𝓐 into 𝓜 satisfying 𝛿(A)B^* + A𝜏(B)^* = 0 for any A, B ∈ 𝓐 with AB^* = 0 or 𝛿(A)◦B^* + A◦𝜏(B)^* = 0 for any A, B ∈ 𝓐 with A◦B^* = 0, where A◦B = AB + BA is the Jordan product.

• Human Ecology Research
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• 제53권2호
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• pp.131-141
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• 2015

The purpose of this study is to examine a potential association between community factors and the establishment of Local Healthy Family Support Centers (LHFSCs). Community factors were population size, community size, local finance independency, number of workplaces per 1,000 people, number of colleges, political party affiliation of mayor, and political party affiliation of congressman. Data of this study were collected from the census indicators of 222 communities from 2004 to 2014 and analyzed by frequency, mean, geographical information system mapping, and the binary logit analysis. The results of this study are as follows. First, LHFSCs are less likely to be established in communities in the provinces of Gangwon, Chungbuk, and Gyeongbuk. Second, the population size was positively related to the establishment of LHFSCs. Third, finance independency was positively associated with the establishment of LHFSCs. Forth, a mayor was more likely to establish LHFSCs if they were affiliated with the ruling conservative political party. However, the establishment of LHFSCs was not affected by other factors such as community scale, number of workplaces per 1,000 people, the number of colleges, and party affiliation of congressman. Thus, the conclusion suggests family policy implications to improve the geographical imbalance of LHFSCs based on the analysis results.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권9호
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• pp.4412-4428
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• 2018

The purpose of this work is to solve the problem of representing an entire video using Convolutional Neural Network (CNN) features for human action recognition. Recently, due to insufficient GPU memory, it has been difficult to take the whole video as the input of the CNN for end-to-end learning. A typical method is to use sampled video frames as inputs and corresponding labels as supervision. One major issue of this popular approach is that the local samples may not contain the information indicated by the global labels and sufficient motion information. To address this issue, we propose a binary hashing method to enhance the local feature extractors. First, we extract the local features and aggregate them into global features using maximum/minimum pooling. Second, we use the binary hashing method to capture the motion features. Finally, we concatenate the hashing features with global features using different normalization methods to train the classifier. Experimental results on the JHMDB and MPII-Cooking datasets show that, for these new local features, binary hashing mapping on the sparsely sampled features led to significant performance improvements.

• 한국통신학회논문지
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• 제38A권8호
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• pp.669-679
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• 2013

HDR (high dynamic range) 영상을 LDR (low dynamic range) 영상으로 변환할 때 톤 맵핑 (tone mapping) 과정은 필수적이다. 많은 TMO (tone mapping operator)는 인간 시각 시스템의 특성들을 모방하여 발달되어 왔고 그 중 가장 대표적인 시각 특성이 국부 순응 방식이다. 그러나 TMO는 밝기나 명암, 채도 등의 영상 정보들을 압축하여 LDR 영상으로 대응시키기 때문에 압축에 의한 화질 저하가 나타난다. 본 논문에서는 TMO에 의한 화질 저하 보상을 위해 인간 시각의 선명도 특성을 기저 및 세부 영상 분할 처리에 적용하여 휘도 적응적 에지 보존 함수를 제안했다. 또한, 인간 시각 시스템에서 공간 주파수와 대비 민감도 사이의 관계를 나타내는 CSF (contrast sensitivity function)를 이용하여 선명화 필터를 설계하고, 이를 배경 휘도에 따라 적응적으로 적용하였다.

• Advances in nano research
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• 제10권3호
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• pp.253-261
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• 2021

Polydimethylsiloxane (PDMS) is one of the most widely adopted silicon-based organic polymeric elastomers. Elastomeric nanostructures are normally required to accomplish an explicit mechanical role and correspondingly their mechanical properties are crucial to affect device and material performance. Despite its wide application, the mechanical properties of PDMS are yet fully understood. In particular, the time dependent mechanical response of PDMS has not been fully elucidated. Here, utilizing state-of-the-art PeakForce Quantitative Nanomechanical Mapping (PFQNM) together with Force Volume (FV) and Fast Force Volume (FFV), the elastic moduli of PDMS samples were assessed in a time-dependent fashion. Specifically, the acquisition frequency was discretely changed four orders of magnitude from 0.1 Hz up to 2 kHz. Careful calibrations were done. Force data were fitted with a linearized DMT contact mechanics model considering surface adhesion force. Increased Young's modulus was discovered with increasing acquisition frequency. It was measured 878 ± 274 kPa at 0.1 Hz and increased to 4586 ± 758 kPa at 2 kHz. The robust local probing of mechanical measurement as well as unprecedented high-resolution topography imaging open new avenues for quantitative nanomechanical mapping of soft polymers, and can be extended to soft biological systems.

• 한국토양비료학회지
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• 제29권2호
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• pp.81-85
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• 1996

1. 밭 토양의 개별특성(個別特性)인 지형조건(地形條件)과 경사도(傾斜度), 유효토심(有效土深) 및 밭 토양의 집단특성(集團特性)인 규모(規模)(면적), 분포토양의 복합도(複合度)(soil complexity), 작도단위(作圖單位)(군(群))의 분산도(分散度)(mapping unit separation), 사업 예정지역의 장폭비(長幅比)(W/L ratio) 등을 연역적(演繹的)으로 계수화(係數化)하여, 적성등급(適性等級)의 일종으로 볼 수 있는 밭 토양 경지정리(耕地整理) 대상지역(對象地域) 선정기준(選定基準)을 제안하였다. 2. 본 기준을 표본지역(標本地域)인 화강암지대(花崗岩地帶) 전작지역(田作地域)과 퇴적암지대(堆積岩地帶) 답작지역(畓作地域)의 밭 토양에 적용하여 본 결과, 지역특성을 객관적으로 차등화(差等化)하므로서 상호비교가 용이하였다. 3. 밭 토양 경지정리(耕地整理) "매우 적합지(適合地)"는 하성평원지(河成平垣地) 전작지(田作地)이거나 밭 토양이 집단적으로 분포된 저구릉지(低丘陵地)로서 분포토양이 단순하고 작도단위당(作圖單位當) 면적도 넓은 지역이었다. 한편, "부적지(不適地)"는 좁고 긴 곡간(谷間)으로서 곡저부(谷底部)(valley bottom)가 논으로 되어있어 작도단위(作圖單位)가 분산(分散)된 지역이었다.

• 농촌계획
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• 제27권4호
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• pp.55-70
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• 2021

In this study, in the field of remote sensing, where the scope of application is rapidly expanding to fields such as land monitoring, disaster prediction, facility safety inspection, and maintenance of cultural properties, monitoring of rural space and surrounding environment using UAV is utilized. It was carried out to verify the possibility, and the following main results were derived. First, the aerial image taken with an unmanned aerial vehicle had a much higher image size and spatial resolution than the aerial image provided by the National Geographic Information Service. It was suitable for analysis due to its high accuracy. Second, the more the number of photographed photos and the more complex the terrain features, the more the point cloud included in the aerial image taken with the UAV was extracted. As the amount of point cloud increases, accurate 3D mapping is possible, For accurate 3D mapping, it is judged that a point cloud acquisition method for difficult-to-photograph parts in the air is required. Third, 3D mapping technology using point cloud is effective for monitoring rural space and rural resources because it enables observation and comparison of parts that cannot be read from general aerial images. Fourth, the digital elevation model(DEM) produced with aerial image taken with an UAV can visually express the altitude and shape of the topography of the study site, so it can be used as data to predict the effects of topographical changes due to changes in rural space. Therefore, it is possible to utilize various results using the data included in the aerial image taken by the UAV. In this study, the superiority of images acquired by UAV was verified by comparison with existing images, and the effect of 3D mapping on rural space monitoring was visually analyzed. If various types of spatial data such as GIS analysis and topographic map production are collected and utilized using data that can be acquired by unmanned aerial vehicles, it is expected to be used as basic data for rural planning to maintain and preserve the rural environment.

• 대한수학회보
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• 제36권3호
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• pp.609-619
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• 1999

IN this note we study more about the omitted are for the extremal functions and its {{{{ {π } over {4 } }}}}-property based upon Schiffer's variational method and zBrickman-Wilken's result. we give an example other than the Koebe function which is both a support point of S and the extreme point of HS. Furthermore, we discuss the relations between the support points and the L wner chain.

• 대한인간공학회:학술대회논문집
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• 대한인간공학회 1996년도 추계학술대회논문집
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• pp.66-71
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• 1996

This study is to observe human observe human positive and negative sensibility according to modalities such as auditory, visual, olfactory and tactile sense. Twenty university students are participated in this study. Experiment is performed in the subject room specially designed. Measurement system is Spectrum 32 (Cadwell) and is capable of brain mapping. The results shows brain local areas showing statistically significant difference between the positive and negative sensibility in ergonomics.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.468-471
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• 2003

The A＊ algorithm is usually used in game programming, mainly because it is fast in finding a optimal path to goal. In this paper. This algorithm was utilized for path finding, HIMM(Histogramic In-Motion Mapping) method is used in map-building. Map is updated continuously with range data sampled by PSD sensors From the map, A＊ algorithm finds a optimal path and sends subsequently the most suitable point to the Eyebot. A＊ algorithm has been tested on the Eyebot in various unknown maps of unknown and proved to work well. It could escape the local minimum, also.