LCC분석에 의한 슬러지수집기 선정 모델

이승훈,우유미,이성락,구교진,현창택,홍태훈,Lee, Seung-Hoon,Woo, Yu-Mi,Lee, Sung-Rak,Koo, Kyo-Jin,Hyun, Chang-Taek,Hong, Tae-Hoon 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.6

사회기반시설의 노후화에 따라 시설물 유지관리에 관한 관심이 증대되고 있으며, 이에 따라 다양한 사회기반시설에 대한 LCC분석 연구가 수행되고 있다. 특히 기계설비가 다수 포함된 기반시설에서는 시설물의 건설비와 더불어 보수/교체비, 에너지비 등 유지관리비용이 높은 비중을 차지하고 있다. 이에 본 연구에서는 하수처리장의 슬러지 수집기 선정에 있어 정량적 요소와 정성적 요소를 모두 고려하는 LCC 분석 모델을 개발하고, 사례적용을 통하여 최적대안을 선정하고자 한다. 문헌고찰과 분석대상 하수처리장의 슬러지 수집기에 대한 공사비와 유지관리 및 보수/교체 이력자료를 바탕으로 비용항목을 도출한다. LCC분석을 위한 가정사항 설정 후, 각 항목별 실적자료와 장비납품업체의 정보를 활용하여 경제성 평가결과를 도출하고, 할인율과 초기투자비 및 유지관리비의 비용변동범위에 따른 민감도분석을 실시한다. 설계자, 자재공급업체 및 시공전문가의 면담을 통하여 유지관리 편의성, 조달 용이성, 슬러지 수집 성능, 침전물제거 효율도, 환경친화성 등 슬러지 수집기 선정을 위한 기술적 사회적 영향인자를 파악한다. 분석된 기술적 사회적 요인과 LCC 분석결과인 경제성에 대하여 각 항목별 쌍별비교를 통하여 항목별 가중치를 설정하고 전문가 평가를 통하여 종합적인 최적안을 선정한다. This study focused on developing Life Cycle Cost(LCC) analysis model for selecting sludge collectors in wastewater treatment system and applying the model to a case study. Cost items are examined through literature review and historical data of a facility. Analysis period, discount rate, energy cost escalation ratio are assumed to reasonable level. Monetary evaluation is performed using historical data and estimations from vendors. Sensitive analysis is executed using Monte Carlo Simulation for assumed factors. Interviews with operators, vendors, constructors, managers are conducted to define factors which indicates ease of maintenance, ease of delivery, technical performance, efficiency, environmental friendship. Factors are representing technical and social factors. Results from LCC analysis and qualitative analysis are evaluate together with Weighted Matrix Evaluation Methods for optimum alternative of sludge collectors.

HVPE 법을 활용한 GaN 성장 시 질화처리에 관한 연구

이승훈,이주형,이희애,오누리,이성철,강효상,이성국,양재득,박재화,Lee, Seung Hoon,Lee, Joo Hyung,Lee, Hee Ae,Oh, Nuri,Yi, Sung Chul,Kang, Hyo Sang,Lee, Seong Kuk,Yang, Jae Duk,Park, Jae Hwa 한국결정성장학회 2019 한국결정성장학회지 Vol.29 No.4

HVPE is one of the GaN single crystal manufacturing methods which has been commercially widely used due to its high growth rate. HVPE method consists of a number of processes, in particular the nitridation of the substrate prior to GaN growth has a significant effect on the crystalline quality of the manufactured GaN single crystal. In this study, we investigated the effect of nitridation for crystalline quality of GaN when it was grown on the sapphire substrate. The whole growth conditions except for the nitridation process were the same, and the gas flow rate supplied to the sapphire substrate was variously changed during the nitridation. Here, we examined the effect of nitridation via the surface characterization of GaN single crystal grown by HVPE. HVPE는 GaN 단결정의 제조 방법 중 하나로 빠른 성장 속도가 장점인 상업적으로 널리 사용되는 성장 방법이다. HVPE 법에 의한 GaN 단결정 성장은 여러 공정으로 이루어지며, 특히 GaN 성장 전 기판의 질화 처리는 성장되는 GaN 단결정 품질에 상당한 영향을 미친다. 본 연구에서는 사파이어 기판 위에 GaN 단결정 성장 시 기판의 질화처리가 성장되는 GaN 단결정 품질에 미치는 영향을 알아보고자 하였다. 질화 처리를 제외한 다른 성장 조건은 동일하게 하였고 질화처리 시 기판에 공급되는 가스 유량을 다양하게 변화시킨 후 GaN 박막을 성장시키고, 성장된 GaN의 표면 특성평가를 통하여, HVPE 법에서의 질화처리 효과를 고찰하여 보고자 하였다.

음성, 성문 및 호흡 통합 검사 시스템의 개발

이승훈,정원혁,최홍식,김수찬,임재중,김덕원,Lee, Seung Hoon,Jung, Won Hyuk,Choi, Hong-Shik,Kim, Soo-Chan,Im, Jae-Joong,Kim, Deok-Won 한국음성학회 2005 음성과학 Vol.12 No.4

Voice is made by systemic interaction of respiration, vocalization, articulation and resonation. There is no existing multi-channel voice analysis system to assess voice and respiration simultaneously. The most existing systems consist of. vocal fold vibration measurement such as stroboscopy, EGG (electroglottography) or laryngeal electromyography and voice analysis system. Since respiration has close relationship with voice simultaneous analysis of both vocal cord vibration and respiration are essential. In this study, a four channel integrated system are developed for acoustic analysis through microphone, vocal fold vibratory analysis using EGG, and respiratory analysis using two channel RIP (respiratory inductive plethysmography).

플라즈마 처리에 의한 폴리비닐리덴플로라이드 나노섬유의 젖음성

이승훈,장선호,소윤미,이헌수,양철민,윤중현,김찬,Lee, Seung-Hoon,Jang, Seon-Ho,So, Yun-Mi,Lee, Hun-Su,Yang, Cheol-Min,Yun, Jung-hyun,Kim, Chan 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.1

Poly(vinylidene fluoride) (PVDF) is a critical polymeric material used in the mass production and application of electrospun nanofibers, and is popular due to its excellent properties. However, electrospun PVDF nanofibers are very hydrophobic and possess low surface energies, limiting their broad application. In this work, we investigated practical methods for the hydrophobic surface modification of PVDF nanofibers using four techniques: radio-frequency (RF) and PIN-type atmospheric plasmas, planar inductively coupled plasma (ICP), and planar capacitively coupled plasma (CCP). The use of RF atmospheric plasma was ineffective under the experimental conditions used, while the PIN-type atmospheric plasma efficiently modified PVDF nanofiber surfaces locally. The application of planar CCP to PVDF nanofibers was more effective than planar ICP for the same experimental conditions. In particular, the water contact angles of samples treated with planar CCP for 600 s and 900 s were $25^{\circ}$ and $10^{\circ}$ respectively, and wettability improved. Analysis with FT-IR, XPS, and FE-SEM showed that the surface CF and CH hydrophobic groups were destroyed without damaging the PVDF nanofibers, and hydrophilic species such as C=O, OH, and COOH were formed. As a consequence, quantitative analysis of nanofiber chemical composition is necessary when treated by plasmas, providing insight into the correlation of specific property changes with processing conditions, and indicating precise research results and application examples.

TadGAN 기반 시계열 이상 탐지를 활용한 전처리 프로세스 연구

이승훈,김용수,Lee, Seung Hoon,Kim, Yong Soo 한국품질경영학회 2022 품질경영학회지 Vol.50 No.3

Purpose: The purpose of this study was to increase prediction accuracy for an anomaly interval identified using an artificial intelligence-based time series anomaly detection technique by establishing a pre-processing process. Methods: Significant variables were extracted by applying feature selection techniques, and anomalies were derived using the TadGAN time series anomaly detection algorithm. After applying machine learning and deep learning methodologies using normal section data (excluding anomaly sections), the explanatory power of the anomaly sections was demonstrated through performance comparison. Results: The results of the machine learning methodology, the performance was the best when SHAP and TadGAN were applied, and the results in the deep learning, the performance was excellent when Chi-square Test and TadGAN were applied. Comparing each performance with the papers applied with a Conventional methodology using the same data, it can be seen that the performance of the MLR was significantly improved to 15%, Random Forest to 24%, XGBoost to 30%, Lasso Regression to 73%, LSTM to 17% and GRU to 19%. Conclusion: Based on the proposed process, when detecting unsupervised learning anomalies of data that are not actually labeled in various fields such as cyber security, financial sector, behavior pattern field, SNS. It is expected to prove the accuracy and explanation of the anomaly detection section and improve the performance of the model.

주요우울장애의 치료로서 경두개 직류자극술(Transcranial Direct Current Stimulation)의 현재

이승훈,김용구,Lee, Seung-Hoon,Kim, Yong-Ku 대한생물정신의학회 2018 생물정신의학 Vol.25 No.4

Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation method that delivers 1-2 mA of current to the scalp. Several clinical studies have been conducted to confirm the therapeutic effect of major depressive disorder (MDD) patients with tDCS. Some studies have shown tDCS's antidepressant effect, while the others showed conflicting results in antidepressant effects. Our aim of this review is to understand the biological bases of tDCS's antidepressant effect and review the results of studies on tDCS's antidepressant effect. For the review and search process of MDD treatment using tDCS, the US National Library of Medicine search engine PubMed was used. In this review, we discuss the biological mechanism of tDCS's antidepressant effect and the existing published literature including meta-analysis, systematic review, control trial, open studies, and case reports of antidepressant effects and cognitive function improvement in patients with MDD are reviewed. We also discuss the appropriate tDCS protocol for MDD patients, factors predictive of response to tDCS treatment, the disadvantages of tDCS in MDD treatment, and side effects.

가소제 함유 PVDF 나노섬유의 상용화 가능성에 관한 연구

이승훈,소윤미,장선호,심현주,김찬,Lee, Seung-Hoon,So, Yun-Mi,Jang, Seon-Ho,Shim, Hyun-Joo,Kim, Chan 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.4

The mechanical properties and softness of electrospun polyvinylidene fluoride (PVDF) nanofibers was improved by the addition of a small amount of tributyl citrate (TBC) plasticizer to PVDF spinning solutions. The PVDF nanofibers containing TBC were prepared by electrospinning and subsequent calendering. The morphology, mechanical properties, and thermal properties of the electrospun PVDF nanofibers were investigated using Field Emission Scanning Electron Microscopy (FE-SEM), tensile test and DSC analysis. The results of the tensile experiment indicate that the PVDF nanofibers containing 5 wt% of TBC have three times better strength and six times higher elongation in the mechanical direction (MD) compared to those of pure PVDF nanofibers. Thus, the results indicate that PVDF nanofibers containing TBC have potential applications not only in the textile industry but also in the electrical and biomedical fields. Further, the excellent mechanical properties and softness of the eco-friendly nanofibers containing TBC plasticizer is useful for its commercialization.

6 MeV 전자선의 차폐물질 원자번호와 조사야 크기에 따른 선량변화 연구

이승훈,곽근탁,박주경,김양수,차석용,Lee, Seung Hoon,Kwak, Keun Tak,Park, Ju Kyeong,Gim, Yang Soo,Cha, Seok Yong 대한방사선치료학회 2013 대한방사선치료학회지 Vol.25 No.2

목 적: 본 연구에서 우리는 6 MeV 전자선의 조사야 확대에 따른 선량변화가 차폐물질 원자번호와 관계가 있음을 알아보고 그 영향인자를 분석 하고자 한다. 대상 및 방법: 먼저 평행평판형 전리함(Exradin P11)을 $25{\times}25cm^2$ 폴리스티렌 팬텀표면에 평탄하게 끼운다. 허용투과율 5% 두께의 알루미늄, 구리, 납 물질들을 팬텀 상단에 차폐시킨 후 조사야 $6{\times}6$, $10{\times}10$ 그리고 $20{\times}20cm^2$별로 측정하였다. 조사조건은 선원-표면간거리 100 cm에서 기준조사야인 $10{\times}10cm^2$에 6 MeV 전자선을 이용하여 100 cGy 조사하였다. 다음으로 MCNP (Monte Carlo N Particle Transport Code)를 이용하여 각 물질 통과 후 발생되는 광자수, 전자수, 그리고 축적에너지를 계산하였다. 결 과: 허용투과율 5% 두께에 대한 차폐물 종류에 따른 측정결과 조사야 $10{\times}10cm^2$을 기준으로 한 $6{\times}6cm^2$과 $20{\times}20cm^2$의 두께변화율은 알루미늄에서 각각 +0.06%와 -0.06%, 구리에서 각각 +0.13%와 -0.1%, 납에서 각각 -1.53%와 +1.92%였다. 계산결과 조사야 $10{\times}10cm^2$ 대비 $6{\times}6cm^2$, $20{\times}20cm^2$의 축적에너지는 차폐를 하지 않았을 경우 각각 -4.3%와 +4.85%, 알루미늄 사용 시 각각 -0.87%와 +6.93%, 구리 사용 시 각각 -2.46%와 +4.48%, 납 사용 시 각각 -4.16%와 +5.57%였다. 광자수의 경우 차폐를 하지 않았을 경우 각각 -8.95%와 +15.92%, 알루미늄 사용 시 각각 -15.56%와 +16.06%, 구리 사용시 각각 -12.27%와 +15.53%, 납 사용 시 각각 -12.36%와 +19.81%였다. 전자수의 경우 차폐를 하지 않았을 경우 각각 -3.92%와 +4.55%, 알루미늄 사용 시 각각 +0.59%와 +6.87%, 구리 사용 시 각각 -1.59%와 +3.86%, 납 사용 시 각각 -5.15%와 +4.00%였다. 결 론: 본 연구로 조사야 증가함에 따른 차폐물 두께가 저 원자번호에서 감소하며, 고 원자번호에서는 증가함을 볼 수 있었으며, 계산을 통해 저 원자번호물질에서는 저지방사선, 고 원자번호물질에서는 산란전자가 영향을 주는 것을 알 수 있었다. Purpose: In this study, we analyzed how the dose change by field size effects on atomic number of shielding materials while using 6 MeV election beam. Materials and Methods: The parallel plate chamber is mounted in $25{\times}25cm^2$ the phantom such that the entrance window of the detector is flush with the phantom surface. phantom was covered laterally with aluminum, copper and lead which thickness have 5% of allowable transmission and then the doses were measured in field size $6{\times}6$, $10{\times}10$ and $20{\times}20cm^2$ respectively. 100 cGy was irradiated using 6 MeV electron beam and SSD (Source Surface Distance) was 100 cm with $10{\times}10cm^2$ field size. To calculate the photon flux, electron flux and Energy deposition produced after pass materals respectively, MCNPX code was used. Results: The results according to the various shielding materials which have 5% of allowable transmission are as in the following. Thickness change rate with field size of $6{\times}6cm^2$ and $20{\times}20cm^2$ that compared to the field size of $10{\times}10cm^2$ found to be +0.06% and -0.06% with aluminum, +0.13% and -0.1% with copper, -1.53% and +1.92% with lead respectively. Compare to the field size $10{\times}10cm^2$, energy deposition for $6{\times}6cm^2$ and $20{\times}20cm^2$ had -4.3% and +4.85% respectively without shielding material. With aluminum it had -0.87% and +6.93% respectively and with lead it had -4.16% and +5.57% respectively. When it comes to photon flux with $6{\times}6cm^2$ and $20{\times}20cm^2$ of field sizes the chance -8.95% and +15.92% without shielding material respectively, with aluminum the number -15.56% and +16.06% respectively and with copper the chance -12.27% and +15.53% respectively, with lead the number +12.36% and -19.81% respectively. In case of electron flux in the same condition, the number -3.92% and +4.55% respectively without shielding material respectively, with aluminum the number +0.59% and +6.87% respectively, with copper the number -1.59% and +3.86% respectively, with lead the chance -5.15% and +4.00% respectively. Conclusion: In this study, we found that the required thickness of the shielding materials got thinner with low atomic number substance as the irradiation field is increasing. On the other hand, with high atomic number substance the required thickness had increased. In addition, bremsstrahlung radiation have an influence on low atomic number materials and high atomic number materials are effected by scattered electrons.

공동주택 마감공사 공사주체별 작업지연 요인 분석

이승훈,김용만,김주형,김재준,Lee, Seung-Hoon,Kim, Yong-Man,Kim, Ju-Hyung,Kim, Jae-Junn 한국건축시공학회 2011 한국건축시공학회지 Vol.11 No.1

건설 공사의 궁극적인 목표는 주어진 공사를 요구된 공사기간내에 설계도서에 명시된 품질 기준을 만족시키면서 가장 경제적이고 안전하게 완성하는데 있다. 마감공사는 공종이 세분화되어 매우 다양하고 복잡한 구조를 가지고 있으며 적정 투입 시점에 대한 세부 공종별 기준이 없고, 선후행 작업간의 우선 순위의 정립의 필요성이 약한 것이 특징이다. 본 연구는 마감공사 작업지연을 최소화하기 위하여 마감공사 세부 공종별 작업지연 우선 순위를 선정하여 소요 공기에 맞추어 프로젝트를 완료할 수 있는 정보를 제공하는 것이 목적이다. 본 연구에서 마감공사를 습식공사와 기타 마감공사로 나누어 각 공종별 내역을 기반으로 중요도를 분류하고, 설문을 통해 설계자, 시공자, 협력업체의 작업지연 요인을 분석하여 최종 작업지연 우선 순위를 선정하여 계획 공사기간 내에 공동주택 프로젝트를 완료할 수 있는 정보를 제공하는데 목적이 있다. The ultimate goal of construction is to complete the given work in the most economical and safest way within the required construction period while meeting the quality standards specified in the design drawing. There are a few characteristics of finish work. First, executed in subdivided processes, finish work involves a very diverse and complex structure. Second, there are no criteria for each segmented process with regard to the appropriate time of input. Third, it is not very necessary to set priorities for lead and lag works. This study intends to provide information on the completion of a project in accordance with the required duration by setting priorities in the delay of each detailed process of finish work to minimize delay in finish work. In this study, finish work is divided into wet work and other types of finish work, and the importance of each process is classified based on the given details of each process. In addition, the study employs a survey to analyze delay factors of a designer, a constructor, and a supplier. Using the survey results, the study sets priorities in delay of final work to provide information on the completion of an apartment project within the planned construction period.

한국인 모유영양아의 분변에서 분리한 Lactobacillus rhamnosus IDCC 3201의 항 알레르기 효과

이승훈,강재훈,강대중,Lee, Seung-Hun,Kang, Jae-Hoon,Kang, Dae-Jung 한국미생물학회 2016 미생물학회지 Vol.52 No.1

본 연구에서는 우수한 아토피 완화능을 가진 유산균을 선별하기 위해 한국인 유아 분변으로부터 23종의 유산균을 분리하였다. 후보 균주들을 배양하여 열처리 된 세포와 상등액 농축물을 각각 얻었다. 우수 균주 선별은 마우스 비장세포를 이용하여 IL-4의 억제 및 IFN-${\gamma}$의 증가 정도를 확인하는 실험을 통해 진행되었다. 선별 실험 결과로 Lactobacillus rhamnosus IDCC 3201 (RH3201)을 OVA로 면역 반응을 유발시킨 BALB/c 마우스에 투여할 유산균으로 선정하였다. RH3201의 균체와 대사물을 경구 투여한 군에서는 유발군에 비해 혈중 IgE의 과다 생성이 억제된 것을 확인하였다. 그러한 알레르기 억제능은 type-1 T helper (Th1) 세포와 type-2 T helper (Th2) 세포의 싸이토카인 간의 균형을 향상시킴으로써 유도되었다. 따라서 RH3201의 균체와 배양물은 면역 조절을 통해 아토피 증상을 완화시킬 수 있음을 확인하였다. We investigated 23 lactic acid bacteria isolated from Korean breast milk-fed infant in order to select strains which show superior anti-allergic effect. The candidates were cultivated and then we obtained dried powders of tyndallized cells and supernatant concentrate separately. Screening was carried out with down-regulation of interleukin (IL) 4 and up-regulation of IFN-${\gamma}$ in mouse splenocytes. As a result of the screening, we selected Lactobacillus rhamnosus IDCC 3201 (RH3201) for oral feeding to ovalbumin-sensitized BALB/c mice. Oral administration of RH3201 as dead cell bodies and supernatant concentrate suppressed hyper-production of serum immunoglobulin (Ig) E levels compared to vehicle group. Such anti-allergic effects were achieved by improvement of the balance between cytokines produced from type-1 helper T (Th1) and type-2 helper T (Th2) lymphocytes. Therefore, RH3201 has potential to improve atopic symptoms by immunomodulatory effect.