• Journal of Korean Neurosurgical Society
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• 제30권sup2호
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• pp.235-241
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• 2001

Objective : Controversy exists which surgical treatment better in lumbar grade I spondylolisthesis, decompressive laminectomy with or without lumbar instrumentation. Methods : Out of Sixty-four patients with lumbar spondylolisthesis underwent surgery, 18 patients operated with decompressive laminectomy alone and 44 patients with decompession and lumbar instrument, during recent 5-years between January, 1994 and December, 1998. The author studied a long term follow-up in the above two groups to analyzing the overall clinical outcomes in each group and to determining the incidence of pos-toperative radiologic instability. Results : 1) Overall postoperative symptoms improvement were not so different in both groups. 2) Postoperative progressive subluxation is more common after decompressive laminectomy without instrumentation than with instrumentation group. 3) Overall clinical outcomes were slightly better in decompressive laminectomy without instrumentation than with instrumentation group but there was no significant difference. 4) Postoperative radiologic changes did not seem to influence the patient-reported clinical outcomes. 5) Postoperative complications is more common in decompressive laminectomy with instrumentation group than without instrumentation group. Conclusion : In the surgical management of grade I spondylolisthesis, the efficiency and superiority of surgical treatments requires the cost effectiveness and risk/benefit analysis of decompressive laminectomy with or without instrumentation. Therefore, Further detailed studies of long term follow up in a large number of patients in each group are needed for choice of best treatment.

• Osong Public Health and Research Perspectives
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• 제9권6호
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• pp.314-324
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• 2018

Objectives: The aim of this study was to analyze research and development projects in mental health services in Korea, using priority evaluation of mental health promotion policies to determine direction of the service. Methods: An online survey was conducted that targeted experts in the mental health service regarding promotion of mental health in Korea in 2016. The survey was based on 32 policy projects that resulted from 12 strategies according to 4 policy objectives. Results: Analysis of 32 mental health projects were assessed regarding the possibility of technology development success, magnitude of the ripple effect, and necessity of a national response. It was observed that 3 policy projects relevant to suicide, had a high relative priority. This was followed by policies for improvement of health insurance and the medical benefit cost system, and policies for reinforcement of crisis psychological support such as those for disaster victims. Conclusion: The prioritization of mental health services should place an emphasis on promotion of a healthy mental lifestyle, rehabilitation support for patients with serious mental illness, and reinforcement of social safety networks for suicide prevention.

• 한국지하수토양환경학회지:지하수토양환경
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• 제23권3호
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• pp.43-50
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• 2018

In a previous study, the feasibility of four materials (bentonite, steelmaking slag, lime and organic compost) to induce soil aggregate formation was assessed and the mixtures of organic compost and lime were chosen as most effective amendments in terms of cost benefit. This work is a subsequent study to evaluate the effectiveness of those amendments in reducing soil loss in $15^{\circ}$ sloped agricultural area by using rainfall simulation test. Three different soils were treated with two conditions of organic compost/lime mixtures (2% + 2%, 3% + 1%, w/w). In the amended soils, soil fertility was increased due to the increase of CEC, T-N, and T-P. During the rainfall simulation, suspended solid in run-off water from amended soil were reduced by 43% ~ 78%. When the content of organic compost was higher than that of lime, reduction of soil loss was also increased by 67% ~ 78%. Sediment discharge was also decreased by 72% ~ 96% in the amended soil. Similar to the suspended solid analysis, higher organic compost content led to more reduction of soil discharging, which implies organic compost is more effective than lime in reducing soil loss. The overall result suggests that the mixtures of organic compost and lime could be used as amendment materials to reduce soil loss in sloped farmland.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제10권7호
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• pp.251-256
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• 2021

SPLE (Software Product Line Engineering)는 소프트웨어 재사용 방법론 중의 하나이다. SPLE의 핵심적인 활동 중 하나는 재사용 가능한 자산 개발에 필요한 피처의 범위를 결정하는 활동이다. 기존 범위결정 방법은 국방 분야에 적용하는데 한계가 있어서, 본 논문에서는 무기체계 항법시스템에 적용 가능한 범위결정 방법을 제안하고, 그 적용 사례를 제시한다. 제안된 방법은 먼저 피처 이익 관점에서 플랫폼 적용 대상 피처의 범위를 결정한다. 그런 다음 제품 이익 관점에서 피처의 범위를 조정하고, 총 비용 관점에서 플랫폼 대상 피처와 제품라인에 포함될 피처의 최종 범위를 결정한다. 본 논문에서는 항법소프트웨어 제품라인에 대해 엔지니어링 할 피처의 범위를 결정하는 방법을 보여줌으로써 제안된 방법의 적용 가능성을 입증하고 평가한다.

• 대기
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• 제29권2호
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• pp.213-218
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• 2019

A valuation of air pollution is critical for relevant policy-making for the public and research direction. This study conducted a willingness-to-pay (WTP) survey using contingent valuation method (CVM) in Seoul Korea. In detail, this study puts an emphasis on its temporal changes referred on two surveys conducted in 2014 and 2019. In reference to the previous studies in 2002, our survey indicated that the public awareness of air pollution and interests on its sources and solutions increased noticeably. Our survey showed that WTP increased significantly from 2588 to 4827 and 8240 Korean Won $month^{-1}$ in 2002, 2014, and 2019, respectively. Moreover, the percentage of respondents to pay the WTP also increased from 48% to 68% and 79% in 2002, 2014, and 2019, respectively. Our analysis based on the number of Google search on particulate matters (PMs) strongly suggests that such the noticeable increases of the public attention to air pollution is well accorded with the moment of the announcement of a standard for ultra-fine particles and the start of PM prediction in late 2013. But the Google search rate grew about 16.7 times in 2009 compared to 2014, which is much larger than the growth rate of interest and WTP between 2014 and 2019. Our results shed light on policy decision for the right person in the right place on the right time in the era of air pollution.

• 한국건축시공학회지
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• 제18권6호
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• pp.533-541
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• 2018

콘크리트의 주요 열화 현상 중 하나인 염해는 철근의 부식을 야기하며 이로 인해 철근콘크리트 구조물에 사용성 및 구조성에 문제가 발생한다. 콘크리트 구조물의 유지관리를 위해 표면 함침제를 콘크리트에 적용시키는 방법은 시공성 및 경제성이 우수하다고 알려져 있다. 본 연구에서는 두 가지 종류의 실리케이트 용액을 사용하여 콘크리트의 표면의 공학적 특성을 개선시킨 후 압축강도와 염화물 확산저항성을 평가하였다. 또한, 기존의 연구와 본 실험결과를 기준으로 대상단면의 내구수명 해석을 실시하였다. 실리케이트 함침 후 콘크리트의 강도 및 염화물 확산 저항성은 크게 증가하였으며 내구수명은 실리케이트 A에서는 159%, 실리케이트 B에서는 304%로 크게 평가되었다.

• 대한건축학회논문집:구조계
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• 제36권4호
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• pp.153-161
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• 2020

This study investigates the recycling potential of demolition waste (DW) according to building structure, while considering economic aspects. For that, this study surveyed 1,034 residential buildings to collect reliable information on demolition waste generation rates (DWGRs). This study suggested a method for operational cost calculation for each stage and carried out an inventory analysis. The economic value of recycled DW materials was also calculated. And then, the recycling potential(RP) was calculated by building structures and waste types. RP by building structure was low (27-40%), and RP was found in the order of masonry-block, wooden, RC and concrete-brick. By type of DWs, the RP of aggregates was considerably lower than 7%, and DWs such as wood, plastics, and metals showed more than 100% RP. Considering the results of this study, In order to improve the RP of buildings and DWs, the diversification of products that recycled waste like aggregates (i.e., mortar, concrete, bricks, blocks, tiles) and the development of high value-added products are considered to be the most urgent problems. Based on the above RP results, this study proposed a more advanced method for life cycle assessment of buildings and demolition waste.

• 대한건축학회논문집:구조계
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• 제34권2호
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• pp.57-66
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• 2018

When developing projects to build facilities to be shared by both military bases and surrounding communities, strategies are needed to achieve two objectives: 1) minimize missteps and opposition from local communities in the process of developing and implementing such projects, and 2) promote cost-benefit optimization and user-satisfaction. With aim of promoting co-operation and co-existence between military bases and adjust communities, this research proposes esthetical factors to be considered in conceiving civil-military sharing facilities. It seeks experts' opinions on the development of civil-military sharing facilities, and examines critical factors (economic feasibility, security, and satisfaction, etc.) for project development as well as building types suitable for shared-use between military bases and local residents. It then establishes a method to prioritize facility-type and narrow down design factors (considerations and restrictions) in project development by applying quantitative analysis. The methodological approach of the research employs the Delphi survey method to quantitatively analyze qualitative information drawn from experts' opinions. At the first round of the survey, facility types, items for consideration and restrictions are drawn, and then at the second round of the survey, criticality of each item is analyzed. Finally, it reaches a conclusion on suitability of facility types for civil-military sharing facilities, and selects project considerations and restrictions when developing this kind of project.

• 국제지역연구
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• 제14권2호
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• pp.3-23
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• 2010

본 연구의 목적은 비시장재화인 철새도래지 을숙도의 가치를 추정하는 것이다. 을숙도는 전 세계적인 생태관광 명소가 되었다. 그리고 을숙도의 환경 복원 작업은 막대한 비용이 소요되고 있다. 일반적으로 정책 판단에 의한 비용 투입은 편익이 사회적 비용을 초과할 때 정당할 수 있다. 을숙도는 문화관광과 같은 외부효과가 있으나, 이를 시장가치로 추정하는 것은 매우 어렵다. 본 연구에서는 단일양분형 가상가치평가법(Contingent Valuation Methods)을 이용하여 을숙도의 가치를 추정하고자 한다. 분석결과에 의하면, log-narmal 모형의 평균 지불의사액(Willingness to Pay : WTP)과 절단된 평균 WTP는 각각 5,240원, 3,374원이며, log-logistic 모형의 평균지불의사액과 절단된 평균 WTP는 각각 5,888원, 3,232원으로 추정되었다. log-narmal 모형의 절단된 평균 WTP에 기초한 연간 총편익 가치는 3,870백만원이며, Log-logistic 모형의 경우는 4,040백만원이다. 본 연구의 결과는 공공재 가치의 중요성을 인식하는 정책 입안자 및 개발자에게 유용한 가이드를 제공할 것이다.

• 한국정보시스템학회지:정보시스템연구
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• 제30권2호
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• pp.215-241
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• 2021

Purpose The purpose of this study is to analyze the impact of perceived value on the intention of continuous use of food delivery app services form the perspective of restaurant owners. We adopt the value-based acceptance model (VAM) in order to derive influential factors (i.e., perceived benefits and perceived sacrifices) that affect perceived value, which in turn leads to the continuous use of food delivery app services. In addition, the moderating role of restaurant type in the relationship between perceived benefits/sacrifices and perceived value. Design/methodology/approach An online survey was conducted on restaurant owners who are using domestic food delivery app services. Samples were collected using the quota sampling method in accordance with the current market share of food delivery app services. A total of 235 participants (restaurant owners) were identified as a valid sample and used for the final analysis. Findings Research findings of the study are as follows. First, sales increase and operational effort decrease among perceived benefits had a significant positive impact on perceived value. Second, perceived cost among perceived sacrifices had a significant negative impact on perceived value. Third, perceived value had a significant positive effect on the intention of continuous use. Finally, the moderating role of restaurant type was found only in the effect of operational effort decrease on perceived value.