• 대한원격탐사학회지
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• 제34권3호
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• pp.495-506
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• 2018

전 지구적으로 기후 변화와 해수면상승에 대한 관심이 집중되면서 빙하의 변위 속도에 관한 연구가 활발하게 진행되고 있다. 빙하의 속도와 관련된 연구에서 현장관측 방법이 가장 정확한 데이터를 취득할 수 있으나 데이터 취득의 어려움으로 위성레이더를 활용한 오프셋 트래킹 기법이 활발하게 활용되고 있다. 오프셋 트래킹은 관측 정밀도가 위상 기반의 지표변위 관측 기법(위성레이더 간섭기법, 위성레이더 다중개구간섭기법)에 비하여 떨어지는 한계가 존재하였으나 최근 연구에 의하여 개선되었다. $Uv{\hat{e}}rsbreen$ 빙하 지역은 최근 연구에 의하여 1.5 m/year의 속도로 빙하의 고도가 저하된다는 사실이 밝혀졌다. 그 만큼 이 지역은 빙하 변위 속도는 기후변화에 큰 영향을 받고 있으며 장기적인 기후변화를 관측하고 예측하는 데에 중요하게 활용될 수 있다. 하지만 이 지역에 대한 구체적인 연구 사례는 거의 존재하지 않는다. 본 연구에서는 개선된 위성레이더 오프셋 트래킹 기법을 활용하여 $Uv{\hat{e}}rsbreen$ 지역의 2차원 변위 속도를 관측하였다. 그 결과 연간 최대 133.7 m/year의 속도로 빙하가 이동하는 것이 확인되었다. 관측 정밀도는 아지무스 방향과 레인지 방향에 대하여 각각 5.4 그리고 3.3 m/year이었다. 이 결과는 장기적인 빙하의 고도 변화에 관한 연구 그리고 기후 변화에 따른 환경 영향 평가 연구에 활용될 것이다.

• 지적과 국토정보
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• 제52권2호
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• pp.211-231
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• 2022

본 연구는 거시경제변수인 전산업생산지수, 소비자물가지수, CD금리, KOSPI지수가 전국, 서울, 광역, 지역으로 구분된 아파트 전세가격에 미치는 영향을 파악하고 LSTM(Long Short Term Memory)을 활용하여 지역별 아파트 전세가격의 방법론적 예측모형을 제시하고자 하였다. VAR분석결과에 따르면 Lag1, 2에서 전국 아파트 전세가격지수와 소비자물가지수는 전국 아파트 전세가격에 유의미한 영향을 주는 것으로 나타났고, 마찬가지로 Lag1,2에서 서울 아파트 전세가격지수와 소비자물가지수, CD금리는 서울 아파트 전세가격에 영향을 주는 것으로 나타났다. 또한, 광역 아파트 전세가격은 Lag1에서 광역 아파트 전세가격지수, 소비자물가지수가 유의미한 영향을 보였으며 지역 아파트 전세가격은 Lag1에서 지역 아파트 전세가격지수, 소비자물가지수가 유의미한 영향을 나타냄을 확인하였다. LSTM예측모델 구축 결과, 지역 아파트 전세가격 예측모델의 RMSE 0.008, MAE 0.006, R-Suared값은 0.999로 예측력이 가장 높았다. 향후, 주요 정책변수들을 포함하여 딥러닝 기반의 발전된 모형을 적용한다면 더욱 의미 있는 결과를 얻을 수 있을 것으로 기대된다.

• 지적과 국토정보
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• 제47권2호
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• pp.159-174
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• 2017

오피스의 수급 불균형은 도시 성장을 약화시킨다. 오피스의 초과공급이 공실률을 높이고 임대료가 하락하는 등 시장의 불안정성을 키울 수 있기 때문이다. 또한 오피스의 초과수요가 기업의 임차비용을 상승시켜 도시의 산업 성장을 제한할 수 있다. 최근 대규모의 신규 공급이 서울 오피스시장의 변동성을 높였다. 그럼에도 불구하고 오피스 공급에 대한 연구는 미미한 실정이다. 따라서 본 연구는 서울 오피스 신규 공급의 영향요인을 확인하고 수급 불균형의 주요 원인인 시차를 고려하여 결정요인들의 동태적 구조적인 움직임을 분석하였다. 이를 위해 시계열모형인 벡터오차수정모형(VECM)을 활용하여 2003년부터 2015년까지 서울 오피스시장의 분기별 자료를 분석하였다. 분석결과, 서울 오피스 신규 공급에 영향을 주는 요인은 1분기 전 오피스 신규 공급량(-), 1분기 전 오피스 고용자 수(+), 2분기 전 이자율(+), 1분기 전 cap rate(-), 2분기 전 cap rate(-)으로 확인되었다. 이를 바탕으로 영향요인들 간의 시간에 따른 상호의존성과 변동에 따른 상대적 기여도를 분석한 결과, 이자율과 cap rate은 신규 공급량에 단기적인 영향을 미친 반면 고용과 공실률은 장기적이고 지속적인 영향을 미쳤다. 따라서 예측 가능한 오피스 시장 전망을 위해서는 이러한 오피스 신규 공급 영향요인에 대한 공신력 있는 자료 구축이 필요하고 지속적인 모니터링이 필요하다. 오피스는 기업과 산업의 성장을 이끄는 핵심적인 도시인프라이기 때문이다.

• 한국기계가공학회지
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• 제19권11호
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• pp.8-15
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• 2020

The government has announced its Hydrogen Economy Roadmap to strengthen global competitiveness on the hydrogen economy by focusing on hydrogen fuel cell electric vehicles and fuel cells. In this regard, the interest on the economics and safety of the infrastructure of hydrogen stations has also increased. In this study, a test bed similar to an actual hydrogen charging facility was built, and a prototype of a piston-type compressor was modeled. In this model, the piston was hydraulically compressed to progressively test leakage, leakage rate, and durability and to check for any malfunction. Moreover, the leakage rate, cylinder leak performance, and compressor operation durability were evaluated for safety; it was confirmed that there were no abnormalities. Nevertheless, an investigation of the long-term use and operating pressure of the compressor is necessary to verify the safety of developing a100-MPa domestic compressor in the future.

• 대한의용생체공학회:의공학회지
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• 제35권6호
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• pp.203-210
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• 2014

Wearable medical device has been a resurgence of interest thanks to the development of technology and propagation of smart phone in recent years. Various types of wearable devices have been introduced and available in market. Capacitive coupled electrode which measures electrocardiogram over cloth is able to be applied wearable device. In previous approaches of capacitive electrode, they need proper pressure for stable contact of the electrode to body surface. However, wearable device that gives pressure on body surface is not suitable for long-term monitoring. In this study, we proposed adhesive polyurethane-based capacitive electrode for patch-type wearable electrocardiogram (ECG) monitoring device. Self-adhesive polyurethane make the electrode and whole system be adhered to the surface of skin without any pressure. The patch-type system is consisted of analog filter, analog-to-digital converter and wireless transmission module and designed to be attached on the body as a patch. To validate the feasibility of the developed system, we measured ECG signal in stable and active state and extracted heart rate. Therefore, we observed skin response after long-term attachment for biocompatibility of the adhesive polyurethane and adhesive strength of it. The result shows the possibility of applying the developed system for ECG monitoring in real-life.

• 무역상무연구
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• 제77권
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• pp.215-237
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• 2018

This study closely examines domestic supplementary measures implemented for Free Trade Agreements (FTA) concerning the agriculture and livestock industry and finds out their problems and put forward improvement measures in terms of their system and contents. The systematic problems with previously established supplementary measures are as follows. First, the existing short and long term measures does not comply with each FTA's special and unique economical, political and legislative purpose. Secondly, they focus on improvements for individual FTAs. They must be holistic and integrative considering all FTAs, thus producing synergy to reach better policy overall. Lastly, FTA policies and the measures must reflect the expanding size and scope of regional economic integration. Problems or concerns in existing supplementary measures include first, flexible financing. The government hands out loans to players in the industry based on assets but these loans must be flexible to market interest changes and must include reduced mortgage rate options. Secondly, rigid standards that trigger direct loss prevention, establishing maximum and minimum loan limits, and developing a comprehensive standard for identifying crops to support are all problems that need to be addressed. Thirdly, education of next and future agricultural generation is paramount in building a competitive workforce. Fourthly, the government must identify industries lacking in performance or short in supply to cease or reducing funding. Last but not least, the government should actively search for new markets for export and produce long term road maps for export growth.

• Asian Pacific Journal of Cancer Prevention
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• 제14권8호
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• pp.4871-4875
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• 2013

This meta-analysis was performed to evaluate and compare the outcomes of robotic gastrectomy (RG) and laparoscopic gastrectomy (LG) for treating gastric cancer. A systematic literature search was carried out using the PubMed database, Web of Knowledge, and the Cochrane Library database to obtain comparative studies assessing the safety and efficiency between RG and LG in May, 2013. Data of interest were analyzed by using of Review Manager version 5.2 software (Cochrane Collaboration). A fixed effects model or random effects model was applied according to heterogeneity. Seven papers reporting results that compared robotic gastrectomy with laparoscopic gastrectomy for gastric cancer were selected for this meta-analysis. Our metaanalysis included 2,235 patients with gastric cancer, of which 1,473 had undergone laparoscopic gastrectomy, and 762 had received robotic gastrectomy. Compared with laparoscopic gastrectomy, robotic gastrectomy was associated with longer operative time but less blood loss. There were no significant difference in terms of hospital stay, total postoperative complication rate, proximal margin, distal margin, numbers of harvested lymph nodes and mortality rate between robotic gastrectomy and laparoscopic gastrectomy. Our meta-analysis showed that robotic gastrectomy is a safe technique for treating gastric cancer that compares favorably with laparoscopic gastrectomy in short term outcomes. However, the long term outcomes between the two techniques need to be further examined.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2018년도 춘계학술대회 논문집
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• pp.56-56
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• 2018

Transparent conductive oxides (TCOs) have attracted attention due to their high electrical conductivity and optical transparency in the visible region. Consequently, TCOs have been widely used as electrode materials in various electronic devices such as flat panel displays and solar cells. Previous studies on TCOs focused on their electrical and optical performances; there have been numerous attempts to improve these properties, such as chemical doping and crystallinity enhancement. Recently, due to rapidly increasing demand for flexible electronics, the academic interest in the mechanical stability of materials has come to the fore as a major issue. In particular, long-term stability under bending is a crucial requirement for flexible electrodes; however, research on this feature is still in the nascent stage. Hydrogen-incorporated amorphous In-Sn-O (a-ITO) thin films were fabricated by introducing hydrogen gas during deposition. The hydrogen concentration in the film was determined by secondary ion mass spectrometry and was found to vary from $4.7{\times}10^{20}$ to $8.1{\times}10^{20}cm^{-3}$ with increasing $H_2$ flow rate. The mechanical stability of the a-ITO thin films dramatically improved because of hydrogen incorporation, without any observable degradation in their electrical or optical properties. With increasing hydrogen concentration, the compressive residual stress gradually decreased and the subgap absorption at around 3.1 eV was suppressed. Considering that the residual stress and subgap absorption mainly originated from defects, hydrogen may be a promising candidate for defect passivation in flexible electronics.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.249-252
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• 2000

An experimental multimodal system combining natural input modes such as speech, lip movement, and gaze is proposed in this paper. It benefits from novel human-compute. interaction (HCI) modalities and from multimodal integration for tackling the problem of the HCI bottleneck. This system allows the user to select menu items on the screen by employing speech recognition, lip reading, and gaze tracking components in parallel. Face tracking is a supplementary component to gaze tracking and lip movement analysis. These key components are reviewed and preliminary results are shown with multimodal integration and user testing on the prototype system. It is noteworthy that the system equipped with gaze tracking and lip reading is very effective in noisy environment, where the speech recognition rate is low, moreover, not stable. Our long term interest is to build a user interface embedded in a commercial car navigation system (CNS).

• 지역사회간호학회지
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• 제16권4호
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• pp.467-477
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• 2005

Purpose: This study was to identify adolescents' smoking behavior and the status and need of smoking prevention education for adolescents. Method: The subjects were 375 students selected through convenient sampling from three middle schools and three high schools in Jeonbuk. Data were collected through a questionnaire survey and analyzed using SPSS 10.1. Result: The smoking rate was 20.8% and 83.7% the students experienced smoking prevention education. Students were educated by a special instructor (39.8%) or a health teacher (26.8%). Among the teaching methods, lecture was 69.4%, but some students (30.7%) wanted anti-smoking school. Among the students, 85.0% answered they want smoking prevention education and 46.7% said that it should be covered in regular curriculum. Conclusion: High interest and continuity are emphasized for the success of smoking prevention education. In addition, various teaching methods need to be developed including anti-smoking school, lectures, counselling and long term education program. Moreover, smoking prevention education programs need to be covered in regular curriculum.