• 지적과 국토정보
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• 제46권2호
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• pp.197-209
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• 2016

The Marcellus Shale industry has impacted Pennsylvania since 2005 and has been a major driver of land use change ever since. The Pennsylvania state park system has been facing encroachment from this industry ever since the first Pennsylvania wellpad was drilled in 2008. Previous research conducted overviews the impacts associated with this industry in regards to environmental quality, but there is limited research associated with the social impacts. The conducted research overviews the Marcellus Shale industry in regards to encroachment on Pennsylvania state parks through a GIS analysis. The purpose of the research is to evaluate how the viewsheds (areas of vision from a given point) of Pennsylvania state park land has been impaired by the Marcellus Shale industry. The results of the research show how the landscape of state parks have change due to the Marcellus Shale industry, and also a focus will be placed on scenic vistas (areas that highlight spectacular views within state parks) of selected parks to see to what extent that pristine landscape has been altered. The results of the research will help provide an idea of landscape change utilizing a GIS analysis and hopefully help to guide future growth.

• 융합보안논문지
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• 제19권1호
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• pp.87-95
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• 2019

점차 고도화되는 사이버 공격에 의한 많은 침해사고로 피해가 증가하고 있다. 많은 기관 및 기업체에서는 사고 탐지를 위한 인프라만에 많은 자원을 투자하기에 초기대응에 미흡하다. 침해사고의 초기대응은 공격의 유입경로 파악이 우선이며, 이루어지고 있는 많은 사이버 공격은 소프트웨어 취약점을 대상으로 하고 있다. 따라서, 소프트웨어 취약점을 대상으로 윈도우 시스템의 아티팩트를 분석하고, 분석한 데이터를 분류하면 신속한 초기대응에 활용할 수 있다. 그러므로 소프트웨어 별 공격 유입 시 남는 아티팩트를 분류하여 침해사고 분석 시에 활용할 수 있는 아티팩트 그룹핑을 제시한다.

• Journal of Chest Surgery
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• 제25권9호
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• pp.943-947
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• 1992

Intramural leiomyoma is the most common benign esophageal tumor, but it is rare compared with carcinoma. Although the most common symptom is dysphagia, this tumor may not cause symptoms before attaining large size. Radiographic and endoscopic findings allow an accurate diagnosis to be made before operation in most patients. The treatment of choice is enucleation without mucosal encroachment. Recently, we experienced two cases of esophageal leiomyoma on the mid portion of esophagus and enucleation of tumors were done by blunt dissection with caution. In one case, postoperative chylothorax was complicated, but cured with conservative treatment. The tissue diagnosis was confirmed with pathological finding.

• 한국진공학회지
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• 제1권1호
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• pp.176-182
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• 1992

CVD 텅스텐의 응력 및 접합 누설전류 특성을 조사하였다. 응력-연속 어닐링온도 의 그래프는 냉각곡선의 응력이 가열곡선의 그것보다 더 높게 나타나는 이력현상을 보인다. SiH4 환원에 의하여 증착된 텅스텐 막이 수소환원에 의하여 증착된 막보다 전반적으로 내부 응력 뿐만 아니라 열 응력도 더 큰 것으로 나타났으며 전자가 후자에 비해 실리콘 기판과의 부착특성이 불량한 것도 이러한 응력차와 유관한 것으로 생각된다. SiH4 환원에 의하여 형 성된 텅스텐 막은 상온에서 인장 응력 상태에 있으며, 온도가 증가됨에 따라 응력이 감소하 다가 $700^{\circ}C$ 부근에서 압축 응력 상태로 바뀌고, 계속 더 온도가 증가됨에 따라 압축 응력 이 급격히 증가한다. SiH4 환원에 의한 텅스텐 막의 증착 온도가 증가함에 따라 n+/p 접합 의 누설전류가 크게 증가하며, 특히 $400^{\circ}C$로 온도가 증가함에 따라 누설전류의 증가폭이 크게 나타났는데, 이것은 수소환원 반응시와 유사하게 텅스텐의 침투(encroachment)에 의 한 실리콘 소모가 그 원인이다. SiH4/WF6 유속비의 증가에 따라서도 누설전류가 증가하는 데 그 효과는 미소한 것으로 나타났다.

• Journal of Forest and Environmental Science
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• 제39권3호
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• pp.167-179
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• 2023

The extent of change in the Land use/Land cover (LULC) of Okomu National Park (ONP) and fringe communities was evaluated. High resolution Landsat imagery was used to identify the major vegetation cover/land use systems and changes around the national park and fringe communities while field visits/ground truthing, involving the collection of coordinates of the locations was carried out to ascertain the various land cover/land use types identified on the images, and the extent of change over three-time series (2000, 2010 and 2020). The change detection was analyzed using area calculation, change detection by nature and normalized difference vegetation index (NDVI). The result of the classification and analysis of the LULC Change of ONP and fringe communities revealed an alarming rate of encroachment into the protected area. All the classification features analyzed had notable changes from 2000-2020. The forest, which was the dominant LULC feature in 2000, covering about 66.19% of the area reduced drastically to 36.12% in 2020. Agricultural land increased from 6.14% in 2000 to 34.06% in 2020 while vegetation (degraded land) increased from 27.18% in 2000 to 38.89% in 2020. The magnitude of the change in ONP and surroundings showed the forest lost -247.136 km² (50.01%) to other land cover classes with annual rate change of 10%, implying that 10% of forest land was lost annually in the area for 20 years. The NDVI classification values of 2020 indicate that the increase in medium (399.62 km² ) and secondary high (210.17 km² ) vegetation classes which drastically reduced the size of the high (38.07 km² ) vegetation class. Consequent disappearance of the high forests of Okomu is inevitable if this trend of exploitation is not checked. It is pertinent to explore other forest management strategies involving community participation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.359-361
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• 2005

This paper presents the method of countermeasures before voltage collapse by load encroachment(impedance of load ability on R-X locus decrease toward zero point) and describes a study of impedance relay(zone-3) operation and voltage instability caused by over load of neighborhood line at contingency of heavy load line.

• Journal of Trauma and Injury
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• 제30권4호
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• pp.212-215
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• 2017

The choice of the most appropriate treatment for thoracolumbar or lumbar spine burst fracture remains controversial from conservative treatment to fusion through a posterior or anterior approach. There are many cases where ligamentotaxis is used to reduce the burst fracture. However, indirect reduction using ligamentotaxis is often limited in the magnitude of the reduction that it can achieve. In our patient with severe burst fracture, we were able to restore an almost normal level of vertebral height and secure spinal canal widening by using only ligamentotaxis by posterior instrumentation. Before the operation, the patient had more than 95% encroachment of the spinal canal. This was reduced to less than 10% after treatment.

• Journal of Korean Neurosurgical Society
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• 제48권5호
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• pp.465-468
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• 2010

Vertebral artery loop formation causing encroachment on cervical neural foramen and canal is a rare cause of cervical radiculopathy. We report a case of 61-year-old woman with vertebral artery loop formation who presented with right shoulder pain radiating to her arm for 2 years. Plain radiograph and computed tomography scan revealed widening of the right intervertebral foramen at the C5-6 level. Magnetic resonance imaging and angiogram confirmed the vertebral artery loop formation compressing the right C6 nerve root. We had considered microdecompressive surgery, but the patient's symptoms resolved after conservative management. Clinician should keep in mind that vertebral artery loop formation is one of important causes of cervical radiculopathy. Vertebral artery should be visualized using magnetic resonance angiography in suspected case.

• 대한전기학회논문지:전력기술부문A
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• 제53권3호
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• pp.161-167
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• 2004

Zone 3 of the distance relay is used to provide the remote back-up protection in case of the failure of the primary protection. However, the risk lot mal-operations under stressed conditions such as heavy loading, voltage and transient instability is usually high. Zone 3 is used in combination with the derivatives of the voltage, and current, etc to prevent mal-operations. Sometimes, the impedance characteristics that restrict the tripping area of relay are used to avoid the mal-operations due to load encroachment. This paper presents a novel Zone 3 scheme based on combining the steady-state components (i.e. 60Hz) and the transient components (TCs) using a state diagram that visualizes the sequence of studies that emanate from the sequence of events. The simulation results show that the novel zone 3 distance relay elements using the proposed method operates correctly for the various events.

• 산업경영시스템학회지
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• 제34권4호
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• pp.120-128
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• 2011

Recent development of communication technology and evolution of telecommunications services, various needs of users are giving Telecom operators difficulties in discovering new services and its promotion strategies. In addition, at the launching of new services, if carriers does not consider complementary and substitution relationships with competing services or self-encroachment problem with the existing service profitability is reduced or lost in the current market. In this study, by analyzing usage pattern of telecommunications services respect to changes in supply and demand environment, the complementarity/substitutability analysis and systematic analytical framework is proposed. This study proposes approaches to establish mobile operators' business strategies and to identify new services demand.