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A Study on an Effective Feature Selection Method Using Hog-Family Feature for Human Detection
Kitae Bae,Libor Mesicek,Hoon Ko 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.12
It is the important that Support Vector Machine (SVM) is the powerful learning machines and has been applied to varying task with generally acceptable performance. The SVM success for classification tasks in one domain is affected by features that it represents the instance of specific class. The representative and discriminative features that they are given, SVM learning is going to provide better generalization and consequently that we are able to obtain good classifier. In this paper, we define the problem of feature choices for tasks of human detections and measure the performance of each feature. And also we consider HOG-family feature to study an effective feature selection method. Finally we proposed the multi-scale HOG as a NEW family member in this feature group. In addition we also combine SVM with Principal Component Analysis (PCA) to reduce dimension of features and enhance the evaluation speed while retaining most of discriminative feature vectors.
배기태 ( Bae Kitae ),류리 ( Ryu Ri ),김용성 ( Kim Yongseong ) 한국공간디자인학회 2020 한국공간디자인학회논문집 Vol.15 No.8
(Background and Purpose) According to the UN's Global Population Outlook Report, the world's population, from 7.6 billion as of 2017, is expected to reach 9.8 billion by 2050. The number of people living in cities will reach 2.5 billion. Consequently, 75% more food will be needed then; more food must be produced in the next 35-40 years than in the past 10,000 years combined. One of the recent innovations in food production is vertical farming. Vertical farms have a structure suitable for urban agriculture. However, constructing new buildings is problematic as land and resources cost extra. Rather than creating a new structure, the problem can be solved by using vacant structures, a continually emerging factor, to save more money. Therefore, this study aims to suggest a plan for vertical farming in idle underground facilities through researching the premise that architecture-based urban agriculture is increasingly needed in a dense urban environment. (Method) The technologies behind vertical farming, as well as the scale and composition of the facilities, were studied using current domestic and overseas commercial cases. This helped envision a module applicable to idle underground facilities. To establish such facilities, a study was conducted on abandoned or declining facilities in Seoul, and the possibility of applying such methods was examined by substituting the configured modules into the facilities. (Results) Consequently, it can be confirmed that the pedestrian environment is poor due to its unnecessary purpose and ineffective management. For example, the empty Euljiro 3-ga Station, the underground walkway in front of the Bank of Korea, and the Sogong-dong underground shopping mall, all with spaces to construct vertical farms, were examined. It was found that as much as 7,000 vegetable heads/month in the idle space of Euljiro 3-ga Station, 8400 vegetable heads/month in the underground walkway in front of the Bank of Korea, and 54,000 vegetable heads/month in the Sogong-dong underground shopping mall could be grown, respectively. (Conclusions) It was confirmed that the available space could be used to provide food to the surrounding commercial districts, offices, and residents; the underground sidewalk ambience could be improved through LED lighting and the soothing green color of vegetables.
Gain and efficiency of table-top terahertz free-electron lasers driven by a microtron accelerator
Bae Sangyoon,Mun Jungho,Jang Kyu-Ha,Lee Kitae,Jeon Min Yong,Jeong Young Uk 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.11
There are difficulties in developing high-power and small-size terahertz (THz) sources that can be used for field applications. In an attempt to design small-size THz free-electron laser (FEL) devices capable of producing higher output powers in the THz spectral region of 1–2 THz, we have developed a microtron accelerator that can accelerate electron beams to 3–6 meV, with a macropulse current of more than 40 mA. The new THz FELs use hybrid electromagnetic (EM) undulators that are two to four times shorter in length than the previous undulator and waveguide resonators with mode cross-sectional areas that are more than two times smaller than the parallel-plate waveguide in the existing FEL. We confirm that the gains and losses of the compact FELs are sufficient for lasing, and we estimate that average output power of approximately 1 W is possible with an efficiency approximately 10 times greater than the existing FEL. The minimum size of the THz FEL system, including a high-voltage pulse modulator, is estimated to be approximately 1.5 m × 2.0 m.
Bae Yurim,Lee Sujin,Kim Kitae,Lee Hyun-Kwon,Kwon Soon-Kyeong,Kim Jihyun F. 한국미생물학회 2021 The journal of microbiology Vol.59 No.11
The actinobacterial group is regarded as a reservoir of biologically active natural products and hydrolytic enzymes with the potential for biomedical and industrial applications. Here, we present the complete genome sequence of Isoptericola dokdonensis DS-3 isolated from soil in Dokdo, small islets in the East Sea of Korea. This actinomycete harbors a large number of genes encoding carbohydrate-degrading enzymes, and its activity to degrade carboxymethyl cellulose into glucose was experimentally evaluated. Since the genus Isoptericola was proposed after reclassification based on phylogenetic analysis, strains of Isoptericola have been continuously isolated from diverse environments and the importance of this genus in the ecosystem has been suggested by recent culturomic or metagenomic studies. The phylogenic relationships of the genus tended to be closer among strains that had been isolated from similar habitats. By analyzing the properties of published genome sequences of seven defined species in the genus, a large number of genes for carbohydrate hydrolysis and utilization, as well as several biosynthetic gene clusters for secondary metabolites, were identified. Genomic information of I. dokdonensis DS-3 together with comparative analysis of the genomes of Isoptericola provides insights into understanding this actinobacterial group with a potential for industrial applications.
예혼합 압축 착화 엔진에서 노킹 예측 및 배기 배출물 저감
염기태(Kitae Yeom),배충식(Choongsik Bae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The knock characteristic and estimation in an engine were investigated under homogeneous charge compression ignition (HCCI) operation. Liquefied petroleum gas (LPG) and gasoline were used as fuels and injected at the intake port using port fuel injection equipment. Di-methyl ether (DME) was used as an ignition promoter and was injected directly into the cylinder during the intake stroke. A commercial variable valve timing device was used to control the volumetric efficiency and the amount of internal residual gas. Different intake valve timings and fuel injection amounts were tested to verify the knock characteristics of the HCCI engine. The ringing intensity (RI) was used to define the intensity of knock according to the operating conditions. The RI of the LPG HCCI engine was lower than that of the gasoline HCCI engine at every experimental condition. The indicated mean effective pressure (IMEP) dropped when the RI was over 0.5 ㎿/㎡ and the maximum combustion pressure was over 6.5 ㎫. There was no significant relationship between RI and fuel type. The RI can be predicted by the crank angle degree (CAD) at 50 CA. Carbon monoxide (CO) and hydrocarbon (HC) emissions were minimized at high RI conditions. The shortest burn duration under low RI was effective in achieving low HC and CO emissions.