• International Journal of Fuzzy Logic and Intelligent Systems
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• 제16권1호
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• pp.72-80
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• 2016

Re-auction happens when a bid winner defaults on the payment without making second in-line purchase declaration even after determining sales permission. This is a process of selling under the court's authority. Re-auctioning contract price of real estate is largely influenced by the real estate business, real estate value, and the number of bidders. This paper is designed to establish a statistical model that deals with the number of bidders participating especially in apartment re-auctioning. For these, diverse factors are taken into consideration, including ratio of minimum sales value from the point of selling to re-auctioning, number of bidders at the time of selling, investment value of the real estate, and so forth. As an attempt to consider ambiguous and vague factors, this paper presents a comparatively vague concept of real estate and bidders as trapezoid fuzzy number. Two different methods based on the least squares estimation are applied to fuzzy regression model in this paper. The first method is the estimating method applying substitution after obtaining the estimators of regression coefficients, and the other method is to estimate directly from the estimating procedure without substitution. These methods are provided in application for re-auction data, and appropriate performance measure is also provided to compare the accuracies.

• 대한임상검사과학회지
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• 제51권2호
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• pp.171-176
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• 2019

BACTEC MGIT 960 system의 mycobacteria growth indicator tube (MGIT) 오염 제거과정의 효율성을 평가하기 위하여 기존 3% Ogawa media와 마이코박테리아의 배양 양상을 비교하였다. 검체는 5% sodium hydroxide (NaOH)과 0.5% N-acetyl-L-cysteine (NALC)를 처리하여 MGIT와 Ogawa media에 접종하였다. 배양된 마이코박테리아는 결핵균(mycobacterium tuberculosis, TB) 항원 kit로 동정하였다. 만약 MGIT에서 5일 이내에 오염균 배양되면 오염제거 과정을 반복하였다. BACTEC MGIT 960 system에 장착한 MGIT 4,790건 중 1,190건(24.8%)이 배양 양성의 결과를 보였고 이중 278건을 재처리 하였다. MGIT와 Ogawa media 사이의 결과를 비교하였을 때 불일치 결과(weighted kappa value: 0.283)를 보였고, 특히 TB 1건과 nontuberculous mycobacteria (NTM) 10건이 재처리한 MGIT에서만 배양되었다. 비록 소수이지만 재처리 과정으로 검출할 수 없었던 마이코박테리아를 검출하였다. 이는 마이코박테리아 검출을 위하여 MGIT와 Ogawa media을 동시에 시행할 뿐 아니라 MGIT에서 위양성을 보이는 경우, 검체의 재처리 과정을 추가하는 것이 필요하다 생각된다.

• 산업기술연구
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• 제36권
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• pp.23-31
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• 2016

This paper presents EMQ models in which some proportion of defective items are produced and some of them are converted to good items through rework process and items not converted are disposed. Numerical models are developed for three cases of disposal and optimal solution of each model is derived. In the first model, if a defective item is found during the production process, only re-workable items are stored and reworked after normal production is finished. Not re-workable items are disposed immediately during normal production. The second model deals with the case where all defective items are stored and items to be disposed are determined in rework process. In the third model, an additional inspection process exists before rework to determine rework or disposal. Numerical examples are presented to validate the proposed models.

• 한국분말재료학회지
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• 제25권3호
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• pp.213-219
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• 2018

We report a method for preparing rare earth oxides ($Re_xO_y$) from the recycling process for spent Ni-metal hydride (Ni-MH) batteries. This process first involves a leaching of spent Ni-MH powders with sulfuric acid at $90^{\circ}C$, resulting in rare earth precipitates (i.e., $NaRE(SO_4)_2{\cdot}H_2O$, RE = La, Ce, Nd), which are converted into rare earth oxides via two different approaches: i) simple heat treatment in air, and ii) metathesis reaction with NaOH at $70^{\circ}C$. Not only the morphological features but also the crystallographic structures of all products are systematically investigated using field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD); their thermal behaviors are also analyzed. In particular, XRD results show that some of the rare earth precipitates are converted into oxide form (such as $La_2O_3$, $Ce_2O_3$, and $Nd_2O_3$) with heat treatment at $1200^{\circ}C$; however, secondary peaks are also observed. On the other hand, rare earth oxides, RExOy can be successfully obtained after metathesis of rare earth precipitates, followed by heat treatment at $1000^{\circ}C$ in air, along with a change of crystallographic structures, i.e., $NaRE(SO_4)_2{\cdot}H_2O{\rightarrow}RE(OH)_3{\rightarrow}RE_xO_y$.

• 한국노년학
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• 제31권3호
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• pp.489-503
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• 2011

본 연구는 노인을 대상으로 하는 성매매 여성, 속칭 '박카스 아줌마'에 관한 질적 연구이다. 연구의 목적은 박카스 아줌마들의 실태를 파악하고 이들을 위한 상담적 대안을 살피는 것이다. 이를 위하여 중도에 연구철회를 요청한 5명을 제외한 53세~71세 사이의 여성 총 10명이 연구에 참여하였다. 이들에 대한 심층면접 결과 이들의 성매매와 관련한 유형으로 유입-생계형, 재유입-생계형, 재유입-유희형, 재유입-강제형이 나타났다. 노인을 대상으로 하는 성매매 여성들을 위한 상담 과정은 노인상담의 특성과 성매매 여성들의 PTSD 양상을 고려해야하며, 사회적 연결망을 통한 복지지원과, 성교육 및 보건 의료적 조치가 필요하다. 나아가 독특한 현상으로 나타난 박카스 아줌마에 대한 연구인력 확보와 상담전문가 및 성교육자 양성을 통해 노인복지 향상을 위한 구체적 노력이 요구된다.

• 한국기계가공학회지
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• 제16권3호
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• pp.63-68
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• 2017

In order to process more complicated and higher-precision parts, generally, an additional axis for a machine tool is needed which was an approach to minimize the cost of tool modification. A table with a rotary reducer that can rotate through the axis of the gear system was employed to a machine tool to achieve the purpose of adding an extra motion axis. In general, the motion of the rotary reducer is driven by a worm/wheel or helical gear system, which is different from the hypoid helical gear structure that used in this research. Reliability of guarantee of high accurancy throughout the whole life cycle is on of the critical factors to evaluate a rotary reducer in this field. In this paper, in order to evaluate life-time of rotary reducer, a low-cost accelerated life test was developed to satisfy the demands of clients.

• IEIE Transactions on Smart Processing and Computing
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• 제4권2호
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• pp.115-125
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• 2015

This paper presents a Cuckoo search algorithm to secure adversaries misdirecting multi-hop routing in Mobile ad hoc networks (MANETs) using a robust Trust Predicated Routing Framework with an optimized cluster head selection. The clustering technique designed in this framework leads to efficient routing in MANETs. The heavy work load in the node causes an energy drop in cluster head, which leads to re-clustering of the group, and another cluster head is selected to avoid packet loss during data transmission. The problem in the re-clustering process is that the overall efficiency of the routing process is reduced and the processing time is increased. A Cuckoo search based optimization algorithm is proposed to solve the problem of re-clustering by selecting the secondary cluster head within the initially formed cluster group and eliminating the reclustering process. The proposed framework enables a node to select a reliable and secure route for MANET and the performance can be evaluated by comparing the simulated results with the AODV routing protocol, which shows that the performance of the proposed routing protocol are improved significantly.

• The Journal of Asian Finance, Economics and Business
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• 제9권5호
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• pp.239-250
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• 2022

A business's Enterprise Resource Planning (ERP) solution is software that fully integrates the services that businesses require, continuously updates business processes and department operations in real-time, and so aids in the successful management of enterprise resources. Previously, ERP solutions were often deployed for large enterprises, but along with the strong digital transformation process, many small and medium enterprises have been deploying Cloud ERP (CERP) solutions. The objective of the study is to measure the factors affecting the successful implementation of CERP solutions at small and medium enterprises and the impact of successful implementation of CERP solutions on business process re-engineering and enterprise performance. Using a quantitative method based on data collected from 230 small and medium enterprises in Vietnam that have been implementing CERP solutions, the results show that there are 5 factors affecting, which are Organizational ERP Strategic, Top management Commitment, Data Security, Training in ERP Projects, Organizational Culture. Research results also show that Successful implementation of CERP has a direct impact on business process re-engineering and business performance. Based on the results, the study has made a number of policy implications in the successful implementation of CERP towards re-engineering business processes to improve the performance of small and medium enterprises.

• 한국결정성장학회지
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• 제21권1호
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• pp.6-14
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• 2011

이수석고 상태로 존재하는 인산부생석고를 ${\beta}$형 반수석고가 되도록 탈수한 다음 급격히 수화시켜 석고성분 만을 미립의 침상결정이 되도록 하여 불순물과 분리하는 공정과 여기서 회수된 침상의 이수석고 슬러리에 무수황산나트륨 ($Na_2SO_4$)을 첨가하여 용해시키고 적당한 조건에서 탈수와 결정성장 조작을 행하여 고순도 이수석고 결정을 회수하는 공정을 제안하였다. 본 고에서는 상온에서의 미립 이수석고의 결정성장속도, 전체 공정 단계별 수용액 내 $Ca^{2+}$의 농도 변화, 결정질 석고의 입도와 회수율에 미치는 수중탈수 시간, 결정성장 온도, 강온속도의 영향에 대하여 조사하였다.

• International Journal of Automotive Technology
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• 제8권2호
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• pp.243-248
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• 2007

The durability of a cylinder head is influenced by the thermal and mechanical history during the manufacturing process, as well as engine operation. In order to improve the durability of cylinder head, both load from engine operation and the preload conditions from the manufacturing process must be considered. The aluminum cylinder head used for a HSDI diesel engine is investigated to reduce the possibility of high cycle fatigue crack in this study. FE analysis is performed to elucidate the mechanism of high cycle fatigue crack in the HSDI diesel cylinder head. Two separate approaches to increase the durability of the cylinder head are discussed: reducing load from engine operation and re-arranging preload conditions from the manufacturing process at the critical location of the cylinder head. Local design changes of the cylinder head and modification of pretension load in the cylinder head bolt were investigated using FE analysis to relieve load at the critical location during engine operation. Residual stress formed at the critical location during the manufacturing process is measured and heat treatment parameters are changed to re-arrange the distribution of residual stress. Results of FE analysis and experiments showed that thorough consideration of the manufacturing process is necessary to enhance the durability of the cylinder head.