• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.81-85
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• 2002

The possibility of simultaneous analysis of 24 pesticides out of 30 residual pesticides which are subjected to test in the golf courses was examined. The utility of the simultaneous analysis of multi-residue pesticides was evaluated by recovery test through a standard addition method of pesticides in water, soil, and lawn grass. The experimental results of the recovery rates for individual pesticides are as follows : The number of pesticide of which average recovery was over 70% regardless of medium was 16 pesticides. These pesticides were composed of 8 organophosphorus pesticides(Chlorpyrifos, Chlorpyrifos-methyl, Diazinon, EPN, Fenitrothion, Phenthoate, Phosalone, and Toclofos-methyl). 4 organochlorinated pesticides(Daconil, Captan, Endosulfan, and Tetradifon), 2 pyrethroid pesticides(Fepropathrin, Lambda-cyhalothrin) and 2 other pesticides(Bromopropylate, Pendimethalin). On the other hand, in case of Dicofol, average recovery by medium was over 70% for water and lawn grass but was only 53.3% for soil. Therefore, the simultaneous analytical method applied in this experiment is not appropriate for analysis of Dicofol in soil. Furthermore, among 7 pesticides, 2 pesticides(Amitraz and Pyraclofos) showed that theirs average recovery rates deviated from criteria(70~130%) at almost all media, while 5 pesticides(Bensulide, Deltamethrin, Iprodione, Phosphamidon and Tralomethlin) were not detected from all media by selected GC detector(NPD or ECD).

• 상하수도학회지
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• 제28권5호
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• pp.529-540
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• 2014

As sewerage systems have obsolete, as quality and service level standards increase, and as rain characteristics change, the sewerage utility authorities are challenged to develop cost recovery strategies that assure financial sustainability. In this study, we conducted scenario analysis to examine the effect of three alternatives of partial or full sewerage cost recovery in Seoul during 2014-30 periods. It turned out that the alternative 1 is optimal and recommended. According to alternative 1, we had better increase annually sewerage fee by 14.8% until 2020 and thereafter apply only the inflation rate in setting sewerage fee. It would gradually decrease the deficit after 2019. The accumulated deficit of 13 billion Won in 2030 was estimated. We expect that this kind of analysis may provide useful informations to help sewage utility staffs, decision makers, and regulatory authorities understand, develop and implement ultimate full cost recovery strategy for many municipalities.

• 정보과학회 논문지
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• 제42권11호
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• pp.1452-1458
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• 2015

한국어 형태소 분석은 교착어 특성상 난이도가 높은 작업이다. 그 중에서 형태소의 원형 복원 작업은 규칙이나 기분석 사전 정보 등을 활용하는 방법이 주로 연구되었다. 그러나 이러한 방법들은 어휘 수준의 문맥 정보를 보지 못하기 때문에 원형 복원에 한계가 있다. 본 논문에서는 최근 자연어처리에 연구되고 있는 기계학습 방법인 딥 러닝(deep learning)을 사용하여 형태소의 원형 복원 문제의 해결을 시도하였다. 문맥 정보를 보기 위해 단어 표현(word embedding)을 사용하여 기존의 방법들 보다 높은 성능을 보였다. 실험 결과, '들/VV'과 '듣/VV'의 복원 문제에 대해서 97.97%로 기존의 자연어처리에 쓰이는 기계학습 방법 중 하나인 SVM(Support Vector Machine)의 96.22% 보다 1.75% 높은 성능을 보였다.

• 한국조리학회지
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• 제22권8호
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• pp.204-218
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• 2016

The purpose of this study is to identify the differences in the effect of service recovery efforts on consumers satisfaction, word of mouth intentions, and revisit intentions when exposed to service failure situations. The service failure situation was classified into outcome-related and process-related failures. The service recovery effort was divided into financial and emotional efforts. Using a scenario technique, this study collected data from diners in Daegu and Gyoungbuk province. The results of the empirical analysis show that the effect of service recovery efforts varies depending on types of service failures and recovery efforts. Also, the interaction between service failure types and service recovery efforts was confirmed.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.333-339
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• 2000

This study was performed to investigate the performance of heat recovery device attached to exhaust gas funnel connected to combustion chamber of greenhouse heating system. The experiment heat recovery system is mainly consisted of LPG combustion chamber and two heat recovery units; unit-A is attached directly to the exhaust gas funnel, and unit-B is connected with unit-A. Heat recovery performance was evaluated by estimating total energy amount by using enthalpy difference between two measurement points together with mass flow rate of gas and/or air passing through each heat recovery unit depending on 5 different flow rates controlled by voltage meter. The results of this experimental study, such as heat exchange behavior of supply air pipes and exhaust air passages crossing the pipes, pressure drop between inlet and outlet, heat recovery performance of exchange unit, etc., will be used as fundamental data for designing optimum heat recovery device to be used for fuel saving purpose by reducing heat loss amounts mostly wasted outside of greenhouse through funnels.

• Journal of Information Processing Systems
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• 제15권1호
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• pp.55-66
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• 2019

Storage system often applies erasure codes to protect against disk failure and ensure system reliability and availability. Liberation code that is a type of coding scheme has been widely used in many storage systems because its encoding and modifying operations are efficient. However, it cannot effectively achieve fast recovery from single disk failure in storage systems, and has great influence on recovery performance as well as response time of client requests. To solve this problem, in this paper, we present HRSF, a Hybrid Recovery method for solving Single disk Failure. We present the optimal algorithm to accelerate failure recovery process. Theoretical analysis proves that our scheme consumes approximately 25% less amount of data read than the conventional method. In the evaluation, we perform extensive experiments by setting different number of disks and chunk sizes. The results show that HRSF outperforms conventional method in terms of the amount of data read and failure recovery time.

• 한국식품조리과학회지
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• 제29권5호
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• pp.605-616
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• 2013

A multistage approach for service recovery enables restaurant managers to do the most effective recovery strategies to reduce customer dissatisfaction and lead to positive behavioral intentions. The purpose of this study was to identify the most effective service recovery strategies in terms of service stage and examine the relationship between service strategies and behavioral intentions. A total of 227 diners examined the customer perceptions to recovery strategies (tangible strategy and intangible strategy) following service failures in each of the four stages:1) reservation and parking, 2) seating and ordering, 3) meal consumption, and 4) payment and exit. The one-way ANOVA showed that intangible strategies were relatively more effective than tangible strategies regardless of service stages. Free meal or free dessert were most effective in service stage 1 and stage 2 whereas correct the failure and reperformance of service found to be the most effective service recovery strategy. Regarding the association between service recovery strategies and behavioral intentions, multiple regression analysis showed that intangible strategies influenced diners' likelihood of positive behavioral intentions whereas tangible strategies lead to diners' willingness to positive behavioral intentions only in service stage 1. The findings enable restaurant practitioners to improve service recovery activities from a service stage perspective.

• 한국의류학회지
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• 제48권2호
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• pp.254-268
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• 2024

Human agents are increasingly being replaced by chatbots. However, like humans, chatbots can also make mistakes in service delivery by failing to provide accurate answers to customer questions while research on service recovery has been highly focused on human employees. Recognizing the necessity of research on effective chatbot service recovery strategies, this study investigated the relationships among service recovery messages (courteous apology vs. humorous apology), perceived sincerity, recovery satisfaction, and continuous usage intention. An online experiment was conducted with the participants randomly assigned to one of two experimental conditions (courteous apology vs. humorous apology). After using the chatbot developed for this study, the participants completed a questionnaire. The analysis results revealed that, in comparison to the humorous apology, the courteous apology had a higher positive predictive effect on perceived sincerity, Furthermore, perceived sincerity and recovery satisfaction sequentially mediated the relationship between the chatbot's courteous apology and continuous usage intention. In conclusion, this study demonstrates that the courteous apology was a more effective approach as a chatbot service recovery strategy. This study offers insights into crafting recovery service messages for chatbots.

• Journal of Electrical Engineering and Technology
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• 제12권1호
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• pp.472-477
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• 2017

In this work, the current limiting and recovery characteristics of a flux-lock type superconducting fault current limiter (SFCL) with series connection of two coils were effectively improved by adding a third winding into the conventional flux-lock type SFCL with series connection of two coils. To confirm the contribution of the third winding to the current limiting and recovery characteristics of this type of the SFCL, short-circuit testing was carried out with consideration of the third winding, and the effect of the third winding on the current limiting and recovery characteristics was examined by comparative analysis of the amplitude of the limited fault current and the power burden of the high-TC superconducting (HTSC) element comprising the SFCL. Through the analysis of both the limiting impedance and the operational current as the main design parameter of the SFCL, the improved current limiting and recovery characteristics of the flux-lock type SFCL using the third winding could be verified.

• Journal of Microbiology and Biotechnology
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• 제19권10호
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• pp.1230-1237
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• 2009

The selective plugging strategy of Microbial Enhanced Oil Recovery (MEOR) involves the use of microbes that grow and produce exopolymeric substances, which block the high permeability zones of an oil reservoir, thus allowing the water to flow through the low permeability zones leading to increase in oil recovery. Bacillus licheniformis TT33, a hot water spring isolate, is facultatively anaerobic, halotolerant, and thermotolerant. It produces EPS as well as biosurfactant and has a biofilm-forming ability. The viscosity of its cell-free supernatant is $120\;mPa{\cdot}s$ at $28^{\circ}C$. Its purified EPS contained 26% carbohydrate and 3% protein. Its biosurfactant reduced the surface tension of water from 72 to 34 mN/m. This strain gave $27.7{\pm}3.5%$ oil recovery in a sand pack column. Environmental scanning electron microscopy analysis showed bacterial growth and biofilm formation in the sand pack. Biochemical tests and Amplified Ribosomal DNA Restriction Analysis confirmed that the oil recovery obtained in the sand pack column was due to Bacillus licheniformis TT33.