• Ecology and Resilient Infrastructure
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• 제4권4호
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• pp.237-244
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• 2017

자연침해조정제도는 개발사업에 따른 자연생태와 경관 침해를 가능한 피하거나 저감하고, 발생할 훼손 정도를 평가하여 구체적인 복원 또는 대체 방법을 강구하도록 하는 취지로 독일에서 처음 소개된 것으로 국토의 과도한 개발을 막고 지속가능한 국토관리를 위한 국토-환경계획 연동제를 효율적으로 운영할 수 있는 장점이 있다. 이에 본 연구는 과천시 주암동을 사례지역으로 도시생태현황지도를 활용하여 독일 자연침해조정 (Eingriffsregelung) 제도를 국내 실정에 맞게 수정, 보완하여 적용했다. 비오톱지도, 경관지도, NDVI (Normalized Difference Vegetation Index) 지도를 중첩 분석하여 개발사업으로 인해 훼손이 가능한 지역 중에서 비교적 생태환경적 가치가 뛰어난 지역을 도출하고 보존할 수 있는 방안을 제시했다. 도시생태현황지도의 활용을 통한 자연침해조정 제도는 국토개발에서 필연적으로 발생할 수밖에 없는 훼손의 정도를 최소화하고, 계획단계에서부터 관리할 수 있는 국토-환경정책의 정책적 연결고리로의 활용 가능함을 확인했다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권4호
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• pp.2119-2123
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• 2016

Background: There is an established link between obesity related metabolic derangement and colorectal cancer development. Recently, we developed a metabolic-colorectal cancer risk score. In this follow-up study, we studied its association with colorectal neoplasm by measuring two major metabolic syndrome biomarkers, leptin and adiponectin. Objectives: To evaluate the serum levels of leptin and adiponectin in patients with colorectal polyps and colorectal cancer and to determine any correlation with metabolic risk score. Results: In total, 130 individuals were studied: 30 controls without colonic pathology, 18 with colonic adenoma (CAP), and 82 with colorectal adenocarcinoma (CRC, 17 cases of T1-2 and 65 cases of T3-4). The metabolic risk scores in CAP and T1-2 CRC were higher than those in the controls and T3-4 CRC cases. There were no statistically significant differences in leptin levels among CAPs, CRCs, and controls. Both leptin and adiponectin levels reflected differences in body mass index and metabolic risk scores. Cases in the CAP group and early T-stage CRC groups had lower adiponectin levels (14.03 and 13.01 mg/ml, respectively) than the no polyps group (19.5mg/ml, p = 0.03). The average serum adiponectin level in the invasive cancer group (18.5 ng/ml) was comparable with that of the control group. Conclusions: The level of serum adiponectin was positively correlated with the metabolic risk score. Decreased serum adiponectin was significantly associated with the development of colorectal adenoma and early stage colorectal carcinoma.

• 보건행정학회지
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• 제18권2호
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• pp.86-106
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• 2008

This research analyzed. knowledge structure and its effect factor by analysis of co-author and keyword network in Korea's health policy and administration sector. The data was extracted from 339 articles listed in the Korean Journal of Health Policy and Administration, and was transformed into a co-author and keyword matrix. In this matrix the existence of a link was defined by impact factors which were calculated by the weight value of what the role was and the rate of how many authors contributed. We demonstrated that the research achievement was dependent on the author's status and network index. Analysis methods were neighborhood degree, correspondence analysis, multiple regression and the difference of weight distribution by research fields. Co-author networks were developed as closeness centrality as well as degree centrality by a few high productivity researchers. In particular, power law distribution was discovered in impact factor and research productivity. The effect of the author's role was significant in both the impact factor calculated by the participatory rate and the number of listed articles. Especially, this journal shared its major researchers who had a licensed physician with the Journal of Preventive Medicine and Public Health. Therefore, social scientists were likely to be small co-author network differently from natural scientists. It was so called 'two cultures' phenomenon. This study showed how can we verified academic research structure existed in the unit of journal like as citation networks. The co-author networks in the field of health policy and administration had more differentiated and clustered than preventive medicine and epidemiology fields.

• 통합자연과학논문집
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• 제13권1호
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• pp.27-33
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• 2020

The unsustainable human activities like increased use of automobiles, heavy industrialization and the use of large volumes of fertilizers, chemicals and pesticides in the agricultural land cause climate change problems in one way or another. Under normal circumstances, the heat radiations from the sun will be reflected back. An excessive volume of GHGs in the atmosphere would prevent these radiations from reflecting back. East Asia is facing severe climate change issues in recent times. A lot of climate change problems such as hurricanes and floods have been reported from this region in the last couple of decades. The study aimed at investigating the climate change in East Asia with changing Sea Surface Temperature (SST). The study adopted a quantitative research method with a case study research design where a deliberate focus was made on the East Asia Region. Secondary data was gathered and analyzed to yield both descriptive and inferential statistics. The study concluded that the impact of East Asia Climate variability was significant mainly for some extreme events. Also, the study concluded that there was a significant link between the change of the East Asia climate variability and that of the sea surface temperature. Further, the study concluded that a linear relationship existed between the sea surface temperature and the climate of East Asia. Hence, a linear regression was a significant predictor of the East Asia Climate (EAC) based on changing sea surface temperature. The model revealed that 37.4% of the variations in the climate change index were explained by the changes in the sea surface temperature. The climate was expected to change with a value of 49.48 for a unit change in the sea surface temperature.

• Journal of Communications and Networks
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• 제13권1호
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• pp.32-42
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• 2011

Frequency reuse among relay stations (RSs) in a down-link access zone is widely adopted for throughput enhancement in IEEE 802.16j relay networks. Since the areas covered by the RSs or the base station (BS) may overlap, some mobile stations (MSs) at the border between two neighboring transmitting stations (RS or BS) using an identical frequency band may suffer severe interference or outage. This co-channel interference within the cell degrades the quality of service (QoS) fairness among the MSs as well as the system throughput. Exclusive use of a frequency band division (orthogonal resource allocation) among RSs can solve this problem but would cause degradation of the system throughput. We observe a trade-off between system throughput and QoS fairness in the previously reported schemes based on frequency reuse. In this paper, we propose a new frequency reuse scheme that achieves high system throughput with a high fairness level in QoS, positioning our scheme far above the trade-off curve formed by previous schemes. We claim that our scheme is beneficial for applications in which a high QoS level is required even for the MSs at the border. Exploiting the features of a directional antenna in the BS, we create a new zone in the frame structure. In the new zone, the RSs can serve the subordinate MSs at the border and prone to interference. In a 3-RS topology, where the RSs are located at points $120^{\circ}$ apart from one another, the throughput and Jain fairness index are 10.64 Mbps and 0.62, respectively. On the other hand, the throughput for the previously reported overlapped and orthogonal allocation schemes is 8.22 Mbps (fairness: 0.48) and 3.99 Mbps (fairness: 0.80), respectively. For a 6-RS topology, our scheme achieves a throughput of 18.38 Mbps with a fairness of 0.68; however, previous schemes with frequency reuse factors of 1, 2, 3, and 6 achieve a throughput of 15.24 Mbps (fairness: 0.53), 12.42 Mbps (fairness: 0.71),8.84 Mbps (fairness: 0.88), and 4.57 Mbps (fairness: 0.88), respectively.

• Journal of Oral Medicine and Pain
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• 제41권1호
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• pp.7-15
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• 2016

Purpose: Mandibular advancement device (MAD) is widely recognized as an important treatment option for obstructive sleep apnea (OSA) and is readily accepted than any other treatment options owing to its simplicity and ambulatory nature. At this time, there are a multitude of MAD designs and their efficacies may be influenced by adjustment and retention mechanism. The MAD with the anterior connector (anteriorly adjustable mandibular advancement device, AAMAD) was newly developed in the Department of Oral Medicine, Dankook University Dental Hospital (Cheonan, Korea) and was prescribed for the OSA patients including snoring patients. Thus, this study was aimed to objectively investigate the effectiveness of the AAMAD on the OSA patients using the self-applied portable device (ApneaLink), and evaluate the treatment outcomes among patients with various severity of OSA level. Methods: Results of the treatment of fourteen patients (13 male, 1 female) with the AAMAD were retrospectively analyzed. Each patient underwent home sleep test before treatment and were divided into two groups, i.e., those with mild (apnea-hypopnea index [AHI] ${\geq}5$ and <15) to moderate OSA (AHI ${\geq}15$ and <30) and severe OSA (AHI ${\geq}30$). After treatment, home sleep test was conducted again and treatment outcomes were compared between mild to moderate and severe OSA patients. Results: Of all patients, 78.6% showed more than 50% AHI reduction. We found a significant reduction (85.3%) of AHI in the severe OSA patients. Patients with mild to moderate OSA showed the reduced AHI (56.1%). Conclusions: We concluded that AAMAD is an effective oral appliance for the majority of OSA patients.

• Journal of Communications and Networks
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• 제18권3호
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• pp.327-332
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• 2016

The routing protocol for low-power and lossy networks (RPL) is an internet protocol based routing protocol developed and standardized by IETF in 2012 to support a wide range of applications for low-power and lossy-networks (LLNs). In LLNs consisting of resource-constrained devices, the energy consumption of battery powered sensing devices during network operations can greatly impact network lifetime. In the case of inefficient route selection, the energy depletion from even a few nodes in the network can damage network integrity and reliability by creating holes in the network. In this paper, a composite energy-aware node metric ($RER_{BDI}$) is proposed for RPL; this metric uses both the residual energy ratio (RER) of the nodes and their battery discharge index. This composite metric helps avoid overburdening power depleted network nodes during packet routing from the source towards the destination oriented directed acyclic graph root node. Additionally, an objective function is defined for RPL, which combines the node metric $RER_{BDI}$ and the expected transmission count (ETX) link quality metric; this helps to improve the overall network packet delivery ratio. The COOJA simulator is used to evaluate the performance of the proposed scheme. The simulations show encouraging results for the proposed scheme in terms of network lifetime, packet delivery ratio and energy consumption, when compared to the most popular schemes for RPL like ETX, hop-count and RER.

• 정보처리학회논문지D
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• 제15D권1호
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• pp.15-22
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• 2008

본 논문에서는 한 번의 데이터베이스 스캔으로 빈발항목집합들을 생성할 수 있는 효율적인 알고리즘을 제안한다. 제안하는 알고리즘은 빈발 항목과 그 빈발항목을 포함하고 있는 트랜잭션과의 관계를 나타내는 이분할 그래프(bipartite graph)를 생성한다. 그리고 생성된 이분할 그래프를 이용하여 후보 항목집합들을 생성하지 않고 빈발 항목집합들을 추출할 수 있다. 이분할 그래프는 빈발항목들을 추출하기위해 대용량의 트랜잭션 데이터베이스를 스캔할 때 생성된다. 이분할 그래프는 빈발항목들과 그들이 속한 트랜잭션들 간의 관계를 엣지(edge)로 연결한 그래프이다. 즉, 본 논문에서의 이분할 그래프는 대용량의 데이터베이스에서 쉽게 발견할 수 없는 빈발항목과 트랜잭션의 관계를 검색하기 쉽게 색인(index)화한 그래프이다. 본 논문에서 제안하는 방법은 한 번의 데이터베이스 스캔만을 수행하고 후보 항목집합들을 생성하지 않기 때문에 기존의 방법들보다 빠른 시간에 빈발 항목집합들을 찾을 수 있다.

• 정보관리연구
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• 제40권1호
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• pp.133-156
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• 2009

이 연구에서는 KISTI NDSL의 학술논문 정보를 웹 학술자원과 연계하는 실험적 연구를 수행함으로써 KISTI의 정보 유통 서비스의 확대 가능성을 살펴보고자 하였다. 이를 위해 웹 학술자원을 수집하여 STEAK 시스템을 이용한 자동 의미 연계를 생성하고 이를 학술논문 검색결과와 결합하였다. 시스템의 검색 정확률을 평가한 결과 매크로 정확률은 62.6%, 마이크로 정확률은 66.9%를 보였으며, 자동연계 성능에 대한 전문가 평가는 76.7점을 보였다. 주제 범주별 전문가 평가는 본 연구를 통해 의미연계를 잘 수행하는 경우에 높게 측정되어 시스템적 성능과 동일한 경향을 보였다. 이 연구는 다양한 웹 학술자원의 서비스 연계를 위하여 논문정보로부터 생성한 언어자원을 의미색인에 사용한 것으로 이를 통해 지속적인 웹 자원의 학술적 활용에 대한 가능성을 제시하고자 하였다.

• 한국ITS학회 논문지
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• 제19권6호
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• pp.26-36
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• 2020

보행자도로의 서비스 수준을 판단하는 평가지표인 보행 교통류율, 점유공간, 밀도, 속도 등의 정량적 자료를 산출하는 것은 많은 시간 소요와 경제적 부담으로 작용한다. 따라서 적절한 보행자 정책 수립을 위한 대체 대안으로 보행자의 미시적 경로 파악과 이를 활용한 서비스 수준 판단기술이 요구된다. 본 연구에서는 지하철역인 역삼역을 중심으로 미시적 교통류 분석 프로그램인 VISSIM을 이용하여 네트워크를 구축하고 정산 및 검증을 통해 신뢰성을 확보하였다. 이를 통해 도로용량편람 상의 속도를 활용하여 보행자 도로의 서비스 수준을 판단해 보았다.