극배치 특성을 갖는 LQR 제어기 설계

박민호(Minho Park),박문수(Mun-Soo Park),박덕기(Duckgee Park),홍석교(Suk-Kyo Hong),이상혁(Sang-Hyuk Lee) 제어로봇시스템학회 2007 제어·로봇·시스템학회 논문지 Vol.13 No.6

Characteristics of Quasi Microwave-Optical Single-Sideband Signal Generation Using a Nonlinear Semiconductor Optical Amplifier

Park, Minho,Sohn, Ju-Hang NADIA 2018 International Journal of Advanced Science and Tech Vol.111 No.-

생활안전사고의 발생원인 유형화에 관한 연구

Minho Park,Changyeol Park 위기관리 이론과 실천 2023 Disastronomy Vol.6 No.1

생활안전사고는 일상생활에서 발생하는 안전사고를 통칭하여 사용된다. 안전에 대한 국민적 관심 증가에도 불구하고, 생활안전사고와 관련한 학술적 논의는 다소 미흡한 것으로 확인되었다. 본 연구는 생활안전사고에 대한 실태를 파악하는데 중점을 두고 있으며, 그 일환으로 발생원인을 유형화하고자 한다. 이를 위해 소방안전본부로부터 수집한 구조구급 데이터베 이스를 이용하였으며, 텍스트마이닝을 통해 원인 관련 주제어를 추출하여 군집분석과 의미연결망 분석을 수행하였다. 먼저 사고 관련 주제어를 사고 유형에 따라 군집화하였으며, 군집분석 결과는 생활안전사고가 일상생활의 경미한 안전사고뿐만 아니라 재난, 범죄 등을 복합적 사고에 기인하고 있음을 보여주었다. 다음은 의미연결망 분석을 통해 사고 소견서 문장 내 동시출현빈도가 높은 단어유형을 확인하였다. 이를 통해 의미연결망 분석이 안전사고의 종류를 파악할 뿐 아니라 사고의 원인, 환자의 상태 및 특징 등의 유형화에도 활용될 수 있음을 알 수 있었다. 본 연구의 성과는 생활안전사고의 발생원인을 과학적으로 파악함으로써 안전정책의 실효성 제고에 기여할 것으로 기대한다. Life safety accidents are commonly used as safety accidents that occur in everyday life. Despite the increase of interests for safety, academic discussions on life safety accidents were confirmed to be insufficient. This study focuses on understanding the actual situation of life safety accidents, and as part of that, this study categorizes the causes of occurrence. To this end, a rescue first aid database collected from the Fire and Safety Headquarters was used, and through text mining, keywords related to the cause were extracted and cluster analysis and semantic network analysis were performed. First, accident-related keywords were clustered according to the type of accident, and the cluster analysis results showed that life safety accidents are caused by complex accidents such as disasters and crimes as well as minor safety accidents in daily life. Next, through semantic network analysis, the types of words with a high frequency of simultaneous appearance in the sentence of the accident opinion were identified. Through this, it was found that semantic network analysis can be used not only to identify the type of safety accident, but also to categorize the cause of the accident, the patient's condition, and characteristics. The results of this study are expected to contribute to enhancing the effectiveness of safety policies by identifying the causes of life safety accidents.

Application of nanofiltration pretreatment to remove divalent ions for economical seawater reverse osmosis desalination

Park, Minho,Park, Jongkwan,Lee, Eunkyung,Khim, Jeehyeong,Cho, Jaeweon Informa UK (Taylor Francis) 2016 Desalination and Water Treatment Vol.57 No.44

<P>To minimize scale formation potential in the applications of reverse osmosis (RO) membranes as a pretreatment unit, relatively loose nanofiltration (NF) membrane systems coupled with ultrafiltration (UF) were used to remove divalent ions from seawater. However, the UF did not reject any ions because of pore size. The rejection of divalent ions by NF was in order of sulfate (>95%), magnesium (>60%), and calcium (>30%) in every rejection experiment based on water recovery rate (40, 50, 60, 70, and 80%). In the UF/NF/RO hybrid pilot system, most of the divalent (>99%) and the monovalent (>97%) ions were effectively rejected with slightly increased divalent ion rejection compared to the UF/RO system. Seawater temperature influenced rejection of ions with regards to either the diffusion- or convection-dominant transport of ions through the membrane pores. Electric power consumption was also compared between the UF/NF/RO process and the UF/RO process. For different salinity conditions (28,000 and 45,000mg/L of total dissolved solids), the lowest energy consumption by NF/RO was 3.3 and 6kWh/m(3) with recovery of 80% for NF and 40% for RO, respectively.</P>

Preparation and Electrochemical Properties of Pt—Ru/Mn₃O₄/C Bifunctional Catalysts for Lithium-Air Secondary Battery

Park, Inyeong,Kim, Taewoo,Park, Hyelee,Mun, Minho,Shim, Sang Eun,Baeck, Sung-Hyeon American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10

<P>Pt-based materials are generally recognized as promising electrocatalysts for use in Li-air batteries, but their high cost and scarcity present limiting factors for practical application. Therefore, catalyst costs need to be reduced by either replacing Pt with less expensive materials or by increasing the Pt dispersion. Herein, we report the fabrication of a Pt-Ru/Mn3O4/C composite as a relatively low cost and highly-efficient catalyst for use in Li-air battery cathodes. Mn3O4/C composites were first synthesized via simple precipitation methods. Pt-Ru nanoparticles were subsequently deposited onto the as-synthesized Mn3O4/C materials via impregnation-reduction methods. Results showed that Pt-Ru nanoparticles were uniformly dispersed onto the Mn3O4/C surface as made evident via transmission electron microscopy. The prepared Pt-Ru/Mn3O4/C catalyst was employed as an air-cathode material for Li-Air batteries, exhibiting not only high electrocatalytic performance but also an improved cyclability up to 130 cycles, compared to a physically-mixed catalyst composite.</P>

Imaging Predictors of Survival in Patients with Single Small Hepatocellular Carcinoma Treated with Transarterial Chemoembolization

Park Chan,Kim Jin Hyoung,Kim Pyeong Hwa,Kim So Yeon,Gwon Dong Il,Chu Hee Ho,Park Minho,Hur Joonho,Kim Jin Young,Kim Dong Joon 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.2

Objective: Clinical outcomes of patients who undergo transarterial chemoembolization (TACE) for single small hepatocellular carcinoma (HCC) are not consistent, and may differ based on certain imaging findings. This retrospective study was aimed at determining the efficacy of pre-TACE CT or MR imaging findings in predicting survival outcomes in patients with small HCC upon being treated with TACE. Besides, the study proposed to build a risk prediction model for these patients. Materials and Methods: Altogether, 750 patients with functionally good hepatic reserve who received TACE as the first-line treatment for single small HCC between 2004 and 2014 were included in the study. These patients were randomly assigned into training (n = 525) and validation (n = 225) sets. Results: According to the results of a multivariable Cox analysis, three pre-TACE imaging findings (tumor margin, tumor location, enhancement pattern) and two clinical factors (age, serum albumin level) were selected and scored to create predictive models for overall, local tumor progression (LTP)-free, and progression-free survival in the training set. The median overall survival time in the validation set were 137.5 months, 76.1 months, and 44.0 months for low-, intermediate-, and high-risk groups, respectively (p < 0.001). Time-dependent receiver operating characteristic curves of the predictive models for overall, LTP-free, and progression-free survival applied to the validation cohort showed acceptable areas under the curve values (0.734, 0.802, and 0.775 for overall survival; 0.738, 0.789, and 0.791 for LTP-free survival; and 0.671, 0.733, and 0.694 for progression-free survival at 3, 5, and 10 years, respectively). Conclusion: Pre-TACE CT or MR imaging findings could predict survival outcomes in patients with small HCC upon treatment with TACE. Our predictive models including three imaging predictors could be helpful in prognostication, identification, and selection of suitable candidates for TACE in patients with single small HCC.

Urban Scene Editing with Diffusion Model using Segmentation Mask

Minho Park,Dong-oh Kang 제어로봇시스템학회 2023 제어로봇시스템학회 국제학술대회 논문집 Vol.2023 No.10

Occurrence of Bemisia tabaci and its vectored virus in Korea

Minho Lee,Ki-Baik Uhm,Sunyoung Lee,Heeyong Park,Murad Ghanim 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10

Nationwide occurrence of Bemisia tabaci Q biotype was identified from 2005 May to 2007 Dec. in total 28 cities/counties of 9 provinces such as Goyang (Kyung-gi), Gangnung (Gang-won), Jincheon (Chung-buk), Buyeo (Chung-nam), Seongju (Kyung-buk), Geoje (Kyung-nam), Bukjeju (Jeju). Host plants of the scale of B. tabaci Q biotype were over 15 crops of tomato, sweet pepper, hot pepper, eggplant, etc. and total 12 species of weeds such as Veronica persica, Ipomoea lacunosa, Conyza sumatrensis, I. hederacea, Xanthium canadense, Humulus japonicus, Boehmeria nivea, Artemisia vulgaris, Paederia scandens, Acalypha austeralis, Brassica juncea, Rumex crispus. For molecular identifying Bemisia tabaci B and Q biotypes, and Trialeurodes vaporariorum, for which it is difficult to distinguish morphologically, sequences of mitochondrial 16S rDNA and CO I (Cytochromoxidase I) gene were analyzed and restriction enzymes were selected for biotypespecific cleaved bands. As the results, Hinf I for 16S rDNA and Vsp I for CO I gene made specific band patterns for the B and Q biotypes in gel electrophoresis. Thus these methods were able to identify those biotypes and species without DNA sequence analysis. Populations of the Q biotype were collected in each regions of Korea from 2005 to 2007, and they were genetically compared using CO I gene sequences. Thus the populations were divided by three different groups which were introduced over 3-4 times before 2007 from different population sources. Geoje and Jeju were suggested as the first regions of introduction. Especially the populations in the first introduced regions were highly homologous with the Q biotype of Japan. In addition, infection pattern of secondary symbionts in populations of the B and Q biotypes in Korea were different from the Israeli populations. Thus it is suggested that Japan is the main source of B. tabaci Q biotype introduced to Korea. In addition, populations of the both of B and Q biotype in Korea were infected by Haemiltonella, which is more effectively related to the transmission of tomato yellow leaf curl begomovirus (TYLCV). Therefore it is needed to monitor continuously if the outbreak of begomovirus vectored by B. tabaci. In this molecular phylogenetic analysis, it was shown that the population of B. tabaci Q biotype in weed plants near greenhouse was introduced to crop plants in greenhouse. Therefore we understand that weed control is important to inhibit recurrence of B. tabaci in greenhouse. Three species of begomovirus, sweet potato leaf curl virus (SPLCV), tobacco leaf curl virus (TLCV), and TYLCV, were reported after introduction of B. tabaci in Korea. Especially Korean government removed all plants in the first TYLCV-occurred greenhouse in 2008. Multiplex PCR diagnosis between TLCV and TYLCV was developed for the more rapid and accurate monitoring. TLCV and TYLCV strains occurred in Korea were highly homologous with strains of Japan. Therefore these results support our suggestion that Japan is the main source of B. tabaci Q biotype introduced to Korea.

Bias Compensated Least Mean Mixed-norm Adaptive Filtering Algorithm Robust to Impulsive Noises

Minho Lee,In Seok Park,Chan-eun Park,Hosub Lee,PooGyeon Park 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10

This paper proposes the bias-compensated normalized least mean mixed-norm (BC-LMMN) algorithm robust to the impulsive noises. This algorithm is derived from the cost function that uses mixed-norm of the l₂ norm and l₄ norm, where a mixing parameter is used to combine them. To reduce the bad effects of impulsive noises, two methods step-size scaler (SSS) and modified Huber function (MHF) are utilized. The SSS is derived from the modified log type cost function and is applied to the proposed algorithm to make the algorithm robust against the impulsive noises. MHF is a piece-wise linear function and effective in the impulsive noise environment. An unbiasedness criterion is adopted to eliminate the bias caused by the input noises and derive the bias compensation vector. Simulation results show that the proposed algorithm outperforms the traditional algorithms in the aspect of the convergence rate and the steady-state misalignment.

Preventive Pest Management Using Field Borders and Companion Plants for Organic Farming

Minho Lee,Byungmo Lee,Eun Jung Han,Jong-Ho Park,Sang-Beom Lee,Kwang-Lai Park,Jin-Ho Kim 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04

Materials are limited for pest control and chemical pesticides are prohibited in organic farming. Thus, the concept of pest control may not be effective for pest management in organic farm. As an alternative approach, landscape management is potentially effective and useful approach for preventing pathogen and insect pests in organic farm. It is needed to develop best practices utilizing functional biodiversity for pest management through landscape management. For this purpose, we investigated the effect of companion plants on species richness of insect pests and natural enemies in the field border area and in the crop plants (rice and soybean). In rice paddy fields, Lysimachiae foenum-graecum, Saururus chinensis were selected as effective companion plants on the paddy field levee for conserving Arachnidae as natural enemy and density suppression of insect pest such as Lissorphoptrus oryzophilus, Riptortus clavatus. As a result, damage rate of rice plant by insect pests was significantly lower (2.5%) and yield rate of healthy grains was significantly higher (8.7%) than control. In soybean fields, Marigold plants such as Tagetes patula, T. officinalis, increased Arthropod species richness and ratio of natural enemy group, and decreased ratio of insect pest group. As a result, yield (weight of 100 seeds) of healthy soybean was significantly increased (2.5%) than control. The 2nd infection rate from damage by R. clavatus was significantly lower in the treated plot than that in control. Thus, yield rates of healthy soybean in the control and the companion plant-treated plot were 79.0% and 84.3%, respectively, compared to conventional farming using chemical pesticides. Therefore, use of companion plants on field border was an effective practices for preventing pest insects and increasing yield in organic farming.