• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.172-172
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• 2011

Anaerobic digestion(AD) has successfully been used for many applications that have conclusively demonstrated its ability to recycle biogenic wastes. AD has been successfully applied in industrial waste water treatment, stabilsation of sewage sludge, landfill management and recycling of biowaste and agricultural wastes as manure, energy crops. During AD, i.e. organic materials are decomposed by anaerobic forming bacteria and fina1ly converted to excellent fertilizer and biogas which is primarily composed of methane(CH4) and carbon dioxide(CO2) with smaller amounts of hydrogen sulfide(H2S) and ammonia(NH3), trace gases such as hydrogen(H2), nitrogen(N2), carbon monoxide(CO), oxygen(O2) and contain dust particles and siloxanes. The production and utilisation of biogas has several environmental advantages such as i)a renewable energy source, ii)reduction the release of methane to the atomsphere, iii)use as a substitute for fossil fuels. In utilisation of biogas, most of biogas produced from small scale plant e.g. farm-scale AD plant are used to provide as energy source for cooking and lighting, in most of the industrialised countries for energy recovery, environmental and safety reasons are used in combined heat and power(CHP) engines or as a supplement to natural. In particular, biogas to use as vehicle fuel or for grid injection there different biogas treatment steps are necessary, it is important to have a high energy content in biogas with biogas purification and upgrading. The energy content of biogas is in direct proportion to the methane content and by removing trace gases and carbon dioxide in the purification and upgrading process the energy content of biogas in increased. The process of purification and upgrading biogas generates new possibilities for its use since it can then replace natural gas, which is used extensively in many countries, However, those technologies add to the costs of biogas production. It is important to have an optimized purification and upgrading process in terms of low energy consumption and high efficiency giving high methane content in the upgraded gas. A number of technologies for purification and upgrading of biogas have been developed to use as a vehicle fuel or grid injection during the passed twenty years, and several technologies exist today and they are continually being improved. The biomethane which is produced from the purification and the upgrading process of biogas has gained increased attention due to rising oil and natural gas prices and increasing targets for renewable fuel quotes in many countries. New plants are continually being built and the number of biomethane plants was around 100 in 2009.

• Journal of Microbiology and Biotechnology
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• 제30권6호
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• pp.937-945
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• 2020

N-acyl-homoserine lactone (AHL)-mediated quorum sensing (QS) plays a major role in development of biofilms, which contribute to rise in infections and biofouling in water-related industries. Interference in QS, called quorum quenching (QQ), has recieved a lot of attention in recent years. Rhodococcus spp. are known to have prominent quorum quenching activity and in previous reports it was suggested that this genus possesses multiple QQ enzymes, but only one gene, qsdA, which encodes an AHL-lactonase belonging to phosphotriesterase family, has been identified. Therefore, we conducted a whole genome sequencing and analysis of Rhodococcus sp. BH4 isolated from a wastewater treatment plant. The sequencing revealed another gene encoding a QQ enzyme (named jydB) that exhibited a high AHL degrading activity. This QQ enzyme had a 46% amino acid sequence similarity with the AHL-lactonase (AidH) of Ochrobactrum sp. T63. HPLC analysis and AHL restoration experiments by acidification revealed that the jydB gene encodes an AHL-lactonase which shares the known characteristics of the α/β hydrolase family. Purified recombinant JydB demonstrated a high hydrolytic activity against various AHLs. Kinetic analysis of JydB revealed a high catalytic efficiency (k_cat/K_M) against C4-HSL and 3-oxo-C6 HSL, ranging from 1.88 x 10⁶ to 1.45 x 10⁶ M^-1 s^-1, with distinctly low K_M values (0.16-0.24 mM). This study affirms that the AHL degrading activity and biofilm inhibition ability of Rhodococcus sp. BH4 may be due to the presence of multiple quorum quenching enzymes, including two types of AHL-lactonases, in addition to AHL-acylase and oxidoreductase, for which the genes have yet to be described.

• 정신신체의학
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• 제25권1호
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• pp.3-11
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• 2017

연구목적 소위 '행동증상 아형 전두측두엽 치매 표현형모사 증후군(behavioral variant frontotemporal dementia phenocopy syndrome)' 환자들은 일차성 정신장애와 감별이 힘들고, 기존의 치료 약물에 대한 반응도 회의적이어서, 오진의 위험과 법적 문제의 유발 가능성이 높으므로, 이러한 양상을 보이는 환자군에 대한 지속적인 관심과 연구가 필요함을 환기 시키기 위해서 본 연구를 시행하였다. 방법 2000년 부터 2016년 까지 발행된 영문 학술지에 게재된 논문을 인터넷에서 'frontotemporal', 'phenocopy', 'behavioral'과 같은 단어의 조합으로 검색하여 찾은 참고문헌을 정리, 고찰하였다. 또한 저자가 직접 경험한 두 증례를 간략히 기술하였다. 결과 환자의 행동 증상은 가족과 지역사회에 큰 영향을 끼치므로 행동증상 아형 전두측두엽 치매에서 정확한 진단이 중요하다. 그러나, 행동증상 아형 전두측두엽 치매에서 현재까지 질병 수정 치료법은 개발되지 않았으며, 현재의 약물학적 치료는 특수한 증상에 도움이 될 뿐이고, 적절한 정신의학적 치료에도 불구하고 점진적인 퇴행이 진행된다. 상당수의 '행동증상 아형 전두측두엽 치매 의심(possible bvFTD)' 환자에서 임상적으로 '행동증상 아형 전두측두엽 치매 가능(probable bvFTD)'으로 진행되지 않으며, 인지기능이나 사회적 기능이 저하되지 않고, 활동 기능의 저하를 보이지 않으며, 생존기간이 조금 더 길고, 수년에 걸쳐서 정상적인 뇌영상화 검사 소견을 보인다. 결론 환전두측두엽 치매 및 일차성 정신장애 환자에서 보이는 전형적인 임상적 양상이나 경과, 뇌영상화 검사를 포함한 진단적 평가와는 다른 비전형적인 소견을 보이는 환자군들은 생각보다 많으며, 정신의학과 의사들이 이에 대한 의학적 지식과 판별 능력이 발전되면, 그 발견의 비율은 훨씬 더 높아질 것이다. 그러나, 현재로서는 이러한 비전형적인 환자군의 정체에 대해서는 이견이 많으며, 향후 적극적인 연구가 행해져야할 분야이다.

• 대한공업교육학회지
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• 제42권2호
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• pp.47-66
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• 2017

최근 사회적으로 인성교육의 필요성이 강조되고 있고, 이에 교원양성 단계에서는 교직 적 인성 검사를 실시하여 인성적 역량을 갖춘 교원 양성에 힘쓰고 있다. 특히 일반고에 비해 부정적 자아개념이 강하고 일자리 조기진입 비중이 높은 특성화고학생의 특성을 감안한다면 특성화고 교사는 일반고 교사에 비해 학생의 인성교육 함량에 더욱 관심을 기울일 필요가 있다. 따라서 이 연구에서는 특성화고 예비교사 대상의 사회정서학습(SEL) 프로그램을 개발하고, 개발된 프로그램이 특성화고 예비교사의 교직인성에 미치는 효과를 분석하였다. 이 연구에서는 ADDIE 모형을 활용하여 사회정서학습 프로그램을 개발하였고 개발된 프로그램은 총 6차시로 구성되어 있다. 연구 대상은 대전광역시 C 대학의 특성화고 예비교사 57인이며, 실험집단 27명에게는 사회정서학습을 통제집단 30명에게는 일반 교과교육 수업을 실시하였다. 이때 수업 내용은 1~2차시의 경우 '자기인식'을, 2~3차시의 경우 '자기관리'를, 4차시의 경우 '관계조율'을, 5차시의 경우 '책임 있는 의사결정'을, 6차시의 경우 '대인관계'를 다루었으며 평균적으로 90분의 수업이 진행되었다. 이 연구에서는 의도적 표집 방법을 이용하였기 때문에 집단 간 사전 점수의 차이가 사후 점수의 차이에 영향을 미칠 수 있다. 따라서 사전 점수를 동일하도록 보정하는 공변량 분석(ANCOVA)을 활용하였고, 그 결과 실험 집단과 통제 집단의 교직인성 사후 점수는 유의미한 차이가 나타났다.

• 한국산학기술학회논문지
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• 제19권7호
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• pp.112-124
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• 2018

본 연구는 유아의 숲동화 구연학습이 자기감정조절과 공동체의식 함양에 미치는 효과를 밝히는데 목적을 갖고 S시소재 유아 40명을 대상으로 8주간 16회기 실험 연구 하였다. 연구결과 전체적으로 숲동화 구연학습을 한 실험집단이 통제집단보다 높게 나타나 실험집단의 숲동화 구연학습의 유용성을 입증해주었다. 특히 공동체의식 요인의 기본생활 습관과 공동체 의식, 사회성발달, 자기인식에서 모두 실험집단이 비교집단에 비해 높게 나타났다. 이는 숲 체험 활동에서의 자연과에서 소통과 함께 동화소재를 자연 속에서 읽으면서 듣고 직접 체험함으로써 유아들이 동화를 통해 주의 집중하고 자연과의 교감 속에 자연 그대로 느끼는 순수한 감성을 바탕으로 또래와 함께 상호 협력하고 공존을 위한 관계 향상은 물론 원칙과 질서를 지키고 이를 실천하려는 소중한 마음이 동화 속 이야기와 함께 자기감정조절까지 증가시킴을 실증해준 것으로 볼 수 있다. 이같은 결과는 숲 활동에 있어 단순한 놀이나 교육 중심에서 벗어나 숲동화 연계 활동을 통해 감정조절 뿐만 아니라 공동체의식 향상에도 긍정적인 교육효과를 가져다 줌에 따라 이의 활용이 보다 확산될 필요가 있음을 시사한 것으로 평가할 수 있다.

• 한국미생물·생명공학회지
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• 제16권3호
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• pp.250-258
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• 1988

리파제는 모노, 디, 트리글리세리드 분자 내의 에스테르 결합을 가수분해 시키는 효소로 잘 알려져 있다. 그런데, 이 효소의 기질인 유지는 물에 용해되지 않아 그 반응이 불균일계에서 일어남으로 리파제 반응의 반응속도론적 해석이 곤란하였다. 이러한 성질은 유지공업에서 리파제를 산업적 촉매로 사용하는데 커다란 장해 요인이 되었었다. 그러나, 최근에 이상계, 역미셀계, 미수계와 같이 반응매질로 유기용매를 도입한 효소반응계가 개발됨에 따라 리파제를 이용한 유지의 전환에 대한 관심이 집중하는 추세에 있다. 리파제를 사용하여 유지를 가수분해시킴으로써 지방간을 생산하고자 할 때 효소반응계로 재래식의 에멀젼보다 이상계 또는 역미셀계를 사용하면 생산성, 굳기름의 가수분해 속도, 생성물 분리등의 측면에서 전체 공정의 효율이 향상될 수 있었다. 한편, 미수계에서 리파제는 에멀젼에서는 불가능한 에스테르 교환반응, 글리세리드 합성, aminolysis, thiotransesterification 및 oximolysis 같은 반응을 촉매 할 수 있는 획기적인 특성을 나타냈다. 공업적 측면에서 이 반응계는 물리적 또는 화학적 특성 (특히 융점)이 변형된 유지를 생산하고자 하는 에스테르 교환반응의 효소반응계로 널리 이용되고 있다. 앞으로 유기용매 내에서 효소의 안정성을 확보할 수 있는 수단 및 연속조작이 가능한 효소반응기의 개발에 관한 연구가 계속된다면 이러한 효소공정이 공업적 제조기술로 발전될 수 있을 것이다.

• 무역상무연구
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• 제46권
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• pp.133-158
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• 2010

Independent guarantee is a creation of the need from the both sides, i.e. the applicant (principal debtor) and the beneficiary (creditor). The former used to have to deposit cash in favor of the beneficiary in case of his default, which laid a burden on his liquidity while the latter still wanted to have the equivalent to cash. Independent guarantee satisfied the both parties by freeing the applicant of a deposit and maintaining the beneficiary's right at the same time. The fact that independent guarantee has three payment mechanisms is not widely known to the public. They are (i) payment on first demand, (ii) payment upon submission of third-party documents, (iii) payment upon submission of an arbitral or court decision. From the applicant's point of view, the order in his favor is (iii), followed by (ii) and (i). As there shouldn't be a case where one party is at a disadvantage against the other, useful insight is being sought for the benefit of the applicant. First, the applicant can offer his intention to provide a payment mechanism (ii) or (iii) rather than (i) if he must deliver it. Second, if the beneficiary still wants to have (i) and the applicant is in a position not to reject it, the latter should thoroughly check any provisions that may work against him later. Third, the applicant could use counterbalancing provisions in underlying contract to cope with protective clauses in the guarantees. Forth, the applicant should review the beneficiary's sincerity to prevent unfair calling risks. The applicant may use an ECA(Export Credit Agency) in his country to which he can transfer not only unfair calling risks, but also political risks. On the other hand, a bank needs to keep the following advice in mind. The foremost important thing for the bank not to forget is that it provides a guarantee as a service provider, not as a responsible party for the feasibility of the project, etc. Credit risk of the applicant should require the greatest attention when issuing a guarantee: the bank should look into the possibility that it can procure immediate reimbursement from its customers after payment to the beneficiary. Second, the applicant's ability to complete the project should be reviewed by checking its track records, techniques and reputation, etc. Third, the bank may also use an ECA to cover the beneficiary's unfair calling risks as well as political risks. In the case of Korea, as Korea Export Insurance Corporation(KEIC) can cover all the risks mentioned above, the bank could use its service called 'Export Bond Insurance.' What's better for the bank is that ECA cover can enhance the bank's asset quality by putting it zero on its risk weighted asset.

• 한국산학기술학회논문지
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• 제21권8호
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• pp.495-500
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• 2020

우리나라 노인들 평균수명이 늘어나면서 고령화로 인한 노인의 건강에 대한 문제가 많이 발생하고, 치매 발병률이 증가되고 있음으로 인해 사회적으로 심각한 수준에 이르고 있다. 치매는 발병 후 치료보다는 예방이 중요한 만큼 노인의 치매 예방에 관심이 모아지고 있다. 본 연구를 위해 양수경, 고보숙, 박정환(2019)의 연구에서 2000년~2018년까지 노인을 대상으로 한 치매예방프로그램의 국내 연구동향에서 분석한 통합프로그램 11편을 기반으로 유아교육에서 이루어지고 있는 놀이를 중심으로 한 노인 치매예방프로그램 문헌연구를 살펴보았다. 활동유형별로 음악, 언어, 신체활동이 각각 4개(40.0%)로 나타났고, 게임, 미술, 작업이 각각 3개(30.0%)로 나타났다. 그리고 무용, 문학, 전통놀이, 레크레이션이 2개(20.0%)로 나타났고, 요가와 생활은 각각 1개(10.0%)의 순으로 나타났다. 본 연구에서는 노인 치매예방프로그램에서 유아교육 콘텐츠의 활용 가능성에 대해 탐구하는 것을 목적으로 노인에게 있어 놀이는 유아 뿐만 아니라 노인들에게 신체 운동능력과 긍정적인 정서, 정서적 특성 등 매우 긍정적인 측면이 나타나고 있다. 노인들을 위한 유아교육 콘텐츠를 활용하여 치매예방프로그램을 개발한다면 지속적인 서비스 제공과 함께 집단활동의 경험과 정신건강을 유지하면서 여가시간을 긍정적으로 활용할 수 있을 것이라고 사료된다.

• 산경연구논집
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• 제10권6호
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• pp.29-37
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• 2019

Purpose - This study intends to analyze Chinese consumers' purchase intention of Korean automobile. The aims of this study investigated to find out how product attributes and brand image affect the consumer's purchase intention of Korean automobiles in China. We consider the product attributes, brand image as evaluation criteria, also recognized as objectives for purchase intention. This study aims to analyze the positive effects on Chinese consumers' purchase intention with the variables by using the research model. Research design, data, and methodology - Based on theory of Purchase Intention, the concept of purchase intention was assessed by two factors: a) product attributes, and b) brand image to test the proposed hypotheses. The survey was conducted for 30 days, from October 17 to November 16 in 2018. With IBM SPSS Statistics 23.0 and IBM SPSS AMOS 23.0, factor analysis and regression, Cronbach's alpha and correlation were tested. 300 samples were used for this analysis. Results - As a main result, product attributes and brand image exerted significant effects on consumer's purchase intention. Thus,

and

were supported. The results showed that the product attributes, brand image had positive effects on purchase intention. The findings of this thesis are as follows: Firstly, automobiles' quality factors were divided into two categories like product properties (price, performance, design, economy, and safety), and brand image (awareness, favorability, reliability, and familiarity). Second, it showed that product properties and brand image had positive impacts on purchase intention of consumer. Conclusions - The impact of product attributes and brand image on consumer perceived value of Korean automobiles in China can be seen as a universal psychology of consumers who trust automobile products such as high quality, technology, ets. The results offer some insights into the extended model and have important managerial implications for Korean automobile enterprise. As the findings of this thesis show, all strategic orientations have significant and positive effects on the ability of innovation. At the same time, automobile company must pay attention to quality. As the relationship between the automobiles' performance and brand image were positive and significant, automobile companies should have comprehensive strategic orientations focused on strengthening these factors.

• 유통과학연구
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• 제10권10호
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• pp.17-24
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• 2012

Purpose - This study aimed to (a) investigate the effects of emotional intelligence on customer orientation, (b) examine the impact of customer orientation on customer relationship management (CRM) performance (including CRM-related variables such as 'relationship commitment,' 'image of corporation,' and 'customer loyalty'), and (c) identify the conceptual framework of emotional intelligence. Research design, data, and methodology - The data were collected using a questionnaire given to a sample of employees of luxury hotels in the metropolitan area. To test the hypotheses, AMOS were conducted for the 271 respondents of the sample using the SPSS Win 17.0 software. The concept of emotional intelligence (EI) has been on the radar of many leaders and managers over the past few decades. Emotional intelligence is generally accepted to be a combination of emotional and interpersonal competencies that influence behavior, thoughts, and interactions with others. Emotional intelligence consists of four factors: understanding the self's emotion, understanding other people's emotions, emotion utilization, and emotion control. Understanding the self's emotion means to understand of my own emotions. Understanding other people's emotions is to understand of the emotions of the people around me and to know how my friends feel based on their behavior. The concept of emotion utilization means to set goals for myself and then try to achieve them, encouraging myself to do my best. The concept of emotion control means I can control my temper, handle difficult situations rationally, and calm down quickly when I am very angry. Results - As a result of the analysis, three factors (understanding the self's emotion, understanding of other people's emotions, and emotion utilization) were shown to have a significant effect on customer orientation. Emotion control had an insignificant effect on customer orientation. Only emotion control makes it difficult to solve customers' problems because it is a passive behavior. In order to solve the customers' problems, hotel employees have to show a positive attitude. Second, customer orientation had a significant effect on customer relationship management performance (customer relationship commitment, corporate image, and customer loyalty). In other words, customer orientation increases commitment to customer relationships. For example, employees who have a customer-orientated perspective provide good service to their customers, while employees who don't have a customer-orientated perspective can't satisfy their customers. Customer orientation can also generate a good image among customers, because they evaluate the image of a hotel through the behavior of hotel employees. So it is very important for employees to show excellent customer orientation. Conclusions - It is very important for hotel CEOs to manage their employees' emotional intelligence. In order to increase their employees' emotional intelligence abilities, CEOs have to manage the overall corporate culture and reward programs to achieve what they want. This is because the system can lead to a customer-orientated mind-set and CRM performance among employees. As a result, the hotel CEO has to pay attention to the emotional intelligence of employees to achieve strong CRM performance. The sentence as originally written was a bit unclear. If this edit does not retain your intended meaning please consider: "Only emotion control does not have a significant impact on customer orientation, and therefore on the ability of an employee to solve customer problems, because it is a passive behavior." Please use the version of the sentence that best captures your original meaning.