• Journal of the Korean Wood Science and Technology
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• v.46 no.5
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• pp.597-609
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• 2018

Korea Forest Service has supplied 76 industrial wood pellet boilers from 2011 to 2015 through subsidy programs. Since carbon monoxide (CO) and nitrogen oxides ($NO_x$) generated during boiler combustion are substances that lead to death in the case of acute poisoning, it is very important to reduce emissions. Therefore, the CO and $NO_x$ emission values of 63 boilers excluding the hot air blower and some boilers initially supplied were analyzed. The emission factor was also calculated from the measured exhaust gas concentration (based on exhaust gas $O_2$ concentration of 12%). The average value of CO emitted from industrial wood pellet boilers was 49 ppm and it was confirmed that the CO concentration was decreasing as the years passed. The emission factor of CO was 0.73 g/kg. The average value of $NO_x$ emitted from industrial wood pellet boilers was 67 ppm and the emission factor of $NO_x$ was 1.63 g/kg. Unlike CO, there was no tendency to decrease according to the installation year. Both CO and $NO_x$ measurements met the limits of the Ministry of Environment. These $NO_x$ emission factors were compared with the $NO_x$ emission factors produced by certified low $NO_x$ burners. The $NO_x$ emission factor of industrial wood pellet boilers was about 1.9 times that of certified low $NO_x$ LNG combustors and about 0.92 times that of coal combustion.

• Korean Journal of Environmental Biology
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• v.37 no.3
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• pp.309-316
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• 2019

Cropland is a major source of atmospheric nitrous oxide (N₂O) and we need technologies in the field of agriculture that can reduce the presence of N₂O. In this study, a field experiment encompassing six treatments was conducted to determine the efflux of N₂O in cropland during the growing season. An experimental plot was composed of two main sectors, no-tillage (NT) and conventional tillage (CT), which were subdivided into three plots according to types of nitrogen (N) sources: CF, chemical fertilizer; HV, hairy vetch+chemical fertilizer; and RY, rye+chemical fertilizer. The cumulative N₂O emissions were 179.8 mg N₂O m^-2 for CF-CT, 108.1 mg N₂O m^-2 for HV-CT, 303.5 mg N₂O m^-2 for RY-CT, 86.7 mg N₂O m^-2 for CF-NT, 73.8 mg N₂O m^-2 for HV-NT, and 122.7 mg N₂O m^-2 for RY-NT during the fallow season. The CT, HV, and RY of no-tilled soils were reduced by 51.8, 31.7 and 59.6%, respectively (p<0.001). Our results indicate that the use of no-tillage and hairy vetch practice rather than conventional tillage and chemical fertilizer practice can decrease N₂O emission.

• International Commerce and Information Review
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• v.2 no.1
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• pp.149-158
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• 2000

[ $\Box$ ]무역업계는 인터넷의 발전에 따라 급속히 사이버화 하고 있는 무역환경에 적극적으로 대응하기 위해 사이버무역의 도입과 활성화를 위한 움직임을 급속히 확대하고 있는 것으로 나타났다. - 조사대상업체의 절반이 넘는(51.8%) 업체들이 자사제품 홍보, 거래선 발굴, 오퍼 및 거래협상 둥 각종 무역업무에 인터넷을 이용하고 있는 것으로 나타났다. - 그러나 무역업계의 사이버무역 활용은 아직 초기단계 수준으로, 이용업체의 절반이상(57.3%)은 작년(1999년) 이후에 처음으로 사이버무역을 시작하였으며 사이버무역에 의한 수출비중도 10% 미만(1999년: 8.8%)의 낮은 수준인 것으로 조사되었다. - 반면, 향후 무역업계의 사이버무역 도입 확대와 수출비중 증가는 가속화될 것으로 나타나, 2000년에는 사이버무역 비중이 전년보다 두 배 이상 늘어난 18.7%에 달할 것으로 예상되었으며, 특히 중소기업의 경우 사이버무역 비중이 상대적으로 대기업보다 커질 것으로 전망되었다. $\Box$ 무역업계가 사이버무역을 도입하는 이유로는 "해외시장 개척효과" 때문이라는 응답이 가장 많았으며, 다음으로 "수출업무 신속화률 통한 인건비 절감"과 "광고비의 절약" 등의 효과를 염두에 두고 있는 것으로 나타났다. - 따라서 여러 수출단계 중에서도 "해외거래선 발굴"， "해외시장정보의 수집", "자사 제품의 해외 홍보" 등 주로 시장개척과 마케팅단계에서 사이버무역이 가장 많이 활용되고 성과도 큰 것으로 나타났다. - 시장개척과 마케팅을 위하여 약 40%의 무역업체가 무역거래 알선 사이트를 이용하고 있으며 특히 중소기업의 활용이 두드러진 것으로 파악되었다. - 반면, 사이버무역 활동이 애로를 겪고 있는 수출단계로는 "대금결제, 물류 유통", "신용조회", "거래계약 체결" 등의 순으로 조사되었는데, 이는 국제적 인증제도의 미비, 신용조사에 대한 공신력 부족 둥이 주된 요인인 것으로 분석되었다. $\Box$ 한편, 무역업계는 사이버무역의 필요성과 활용성과에 대해 긍정적인 인식을 갖고 있으나, 사이버무역을 활성화하는데 필요한 인프라로서 사이버 무역 전문인력이나 인터넷 통신환경 등은 아직 만족할 만한 수준이 못 되는 것으로 조사되었다. - 사이버인력 부문에서는 무역업무 종사자 중 인터넷 활용직원의 비율이 50%가 되지 않는 업체가 전체의 절반을 넘고 있으며, 특히 중소기업의 인터넷 활용 직원의 비율이 대기업에 비해 낮은 것으로 나타났다. - 향후 무역업체가 10명의 무역인력을 채용한다고 가정할 경우, 평균 4.5명을 사이버무역 전문인력으로 채용할 계획이라고 밝히고 있으며, 중소기업(4.7명)이 대기업(3.4명)보다 사이버무역 전문인력에 대한 수요가 더 큰 것으로 나타나 이에 대한 대책이 시급한 것으로 파악되었다. - 인터넷 전용선 설치비율도 전체적으로 40%대에 그치고 있으며, 특히 중소기업의 경우 전용선 이용비율(38.5%)이 대기업(80%)의 절반에도 못미치는 열악한 수준에 있어 중소기업의 사이버 무역이용에 하나의 걸림돌이 되고 있는 것으로 조사되었다. $\Box$ 사이버 무역활성화를 위해 가장 시급한 과제로는 "사이버무역 전문인력 확충을 위한 체계적 교육 및 훈련제공"과 "사이버무역 관련법규 및 제도의 마련"으로 나타나, - 정부나 유관기관이 앞장서서 사이버무역 관련 교육프로그램의 개발, 자격시험제도의 도입 등과 아울러 대외무역법 둥 관련법률 및 제도를 정비해 줄 것을 무역업계에서 기대하는 것으로 지적되었다.

• Journal of Hospice and Palliative Care
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• v.17 no.4
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• pp.259-269
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• 2014

Purpose: This preliminary study is aimed at developing standardized tools for psycho-social assessment of patients in needs for hospice/palliative care. To accomplish the purpose, investigators examined effects of perceptions of social workers on the importance of psycho-social domains of assessment in hospice/palliative care settings. Moreover, investigators paid attention to variances of perceptions of social workers' along with types of institution and credentials of those family settings. Methods: A form of questionnaire was first explored from an initial interview assessment of 10 government-certified hospice care providers and a literature review, second constructed with eight domains and 80 items, and sent by e-mail to 55 institutions and hospitals providing hospice/palliative cares in Korea. Lastly, a total of 31 agencies returned with a completed responses and consent form (56% response rate). SPSS program (version 18.0) was used for data analysis. Results: Study found that social workers perceived patients' family background (m=4.53, 5-point scale) as the most important assessment domain, whereas economic conditions (4.06 point) the least important. Social workers' perception varied by credentials (i.e., license types, training, full-time position, types of care facility). Conclusion: Based upon study findings, investigators can conclude strong needs for developing a assessment tool that measures multiple domains (i.e., psychological, social and ecological aspects) of patients. A standardized assessment tool should be structured with 2 axis (center/core and expanded/peripheral) and tailored for institution type. Second, professional trainings must be provided by strengthening legal institutionalization and fostering qualified social workers with full responsibilities of hospice and palliative care patients.

• Journal of Yeungnam Medical Science
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• v.27 no.1
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• pp.27-36
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• 2010

Purpose : The purpose of this study was to find out cognitive function of the patients with subjective memory complaint. Material and Methods : From March 1st 2005 to May 31st 2009, 155 normal individuals without any medical illness who visited Yeungnam University Hospital to undergo medical checkup with neurocognitive test was enrolled, and checked by using Cognitive Assessment & Reference Diagnostic System. Results : 107 of the patients had normal cognitive function, 21 patients (about 15%) were diagnosed with dementia, and 10 patients (about 7%) were diagnosed with considerable psychiatric illness, such as depression, anxiety disorder, adjustment disorder. In amnesia, agnosia, aphasia, attention, calculation, dysexecution, Dementia group and Psychiatric illness group has worse score than Normal individuals group. But, in apraxia, Dementia group has worse score than Psychiatric illness group and Normal individual group. Conclusion : Because the patients with subjective memory complaint can be diagnosed as any psychiatric illness as well as dementia, sensitive screening test and early psychiatric approach is needed.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.56 no.1
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• pp.44-49
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• 2011

The bio-degradable transplanting pot containing rice by-product (rice-hull and rice-bran) were developed, and tested their ability for agronomic use. Rice by-products were crosslinked with biodegradable aliphatic ally aromatic copolyesters or urea resin for making transplanting pot. Mechanical properties and degradability of these pots were measured and compared to those of the Jiffy pot (commercially used bio-degradable pot). Mechanical strength was higher than that of Jippy pot, and bio-degradability was excellent under the actual field condition. In addition, the pot could be degraded within 3 months under the ground. Our result indicated bio-degradable pot containing rice by-products has a great potential for such agronomic use.

• Journal of Information Management
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• v.43 no.1
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• pp.63-87
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• 2012

This study aims to analyse the actual condition of the ebook services and propose the improvements of ebook services for children in the Korean public library. For this purpose, the current condition of the ebook services in the public libraries were analyzed and categorized by three criteria. Secondly, the ebook use analysis was conducted using PCs and mobile devices in terms of access to ebook library site, searching method, contents type and viewer, lending process, and user help. As a result of the analysis, several issues such as the difficulty in access to ebook site, the complexity of setting and usage depending on the file format, the insufficient user guide, the relatively lower quality service than the commercial's, and the lack of retrieval functions specialized for the ebook were presented. The improvement plan for the ebook services, especially for children in the public library was suggested.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.3736-3741
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• 2015

Crash impact test is conducted to verify the crashworthiness of fuel tank. Success of the crash impact test means the improvement of survivability of crews by preventing post-crash fire. But, there is a big risk of failure due to huge external load in the crash impact test. The failure of crash impact test can result in serious delay of a entire rotorcraft development because of the design complement and re-production of the test specimens requiring a long-term preparation. Thus, the numerical simulations of the crash impact test has been required at the early design stage to minimize the possibility of trial-and-error in the real test. Present study conducts on the numerical simulation of phase I crash impact test using SPH supported by crash simulation software, LS-DYNA. Test condition of MIL-DTL-27422 is reflected on analysis and material data is acquired by specimen test of fuel cell material. As a result, the crash load on the skin material, overlap area and metal fitting is estimated to confirm the possibility of acquisition of the design load for the determination of the overlap area and adhesive strength.

• Journal of Aerospace System Engineering
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• v.15 no.5
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• pp.24-32
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• 2021

Personal Air Vehicle (PAV), Cargo UAS (Cargo UAS), and existing manned and unmanned aircraft are key vehicles for urban air mobility (UAM), and should demonstrate compatibility for the design of aircraft systems. The safety assessment required by for certification to ensure safety and reliability should be systematically performed throughout the entire cycle from the beginning of the aircraft development process. However, with the increasing complexity of safety critical aviation systems and the application of state-of-the-art systems, conventional experience-based and procedural-based safety evaluation methods make ir difficult to objectively assess safety requirements and system safety. Therefore, Model-Based Safety Assessment (MBSA) using modeling and simulation techniques is actively being studied at domestic and foreign countries to address these problems. In this paper, we propose a Model-Based Safety Evaluation framework utilizing modeling and simulation-based integrated flight simulators. Our case studies on the Traffic Collision Availability System (TCAS) and Wheel Brake System (WBS) confirmed that they are practical for future safety assessments.

• KIPS Transactions on Software and Data Engineering
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• v.9 no.12
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• pp.387-402
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• 2020

Conventional automotive development has mainly focused on ensuring correctness and safety and security has been relatively neglected. However, as the number of automotive hacking cases has increased due to the increased Internet connectivity of automobiles, international organizations such as the United Nations Economic Commission for Europe(UNECE) are preparing cybersecurity regulations to ensure security for automotive development. As with other IT products, automotive cybersecurity regulation also emphasize the concept of "Security by Design", which considers security from the beginning of development. In particular, since automotive development has a long lifecycle and complex supply chain, it is very difficult to change the architecture after development, and thus Security by Design is much more important than existing IT products. The problem, however, is that no specific methodology for Security by Design has been proposed on automotive development process. This paper, therefore, proposes a specific methodology for Security by Design on Automotive development. Through this methodology, automotive manufacturers can simultaneously consider aspects of functional safety, and security in automotive development process, and will also be able to respond to the upcoming certification of UNECE automotive cybersecurity regulations.