• Journal of radiological science and technology
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• v.27 no.4
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• pp.49-54
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• 2004

Purpose : To valuate the usefulness of mammographic image by using phantom 1,2 to controls the enhancement of image quality. Procedure : Set up same equipments for experiment (all the qualification must be the same). Control group and 4 other experiment the developing mammographys by using the image system with film/intensifying screen and distribute marks on each test objects of phantom 1, 2. Result : The results of the experiment using phantom 1, 2 on control group and 4 others are : 1. phantom 1's valuation with 3 items. - control group received 29 out of 32 - group A received 25 - group B received 16 - group C received 11.5 - group D received 28.5 The evaluation shows that the system has proved to display excellent image quality except group B and C. 2. Phantom 2's valuation with 4 items. - control group received 38 out of 38 - group A received 30 - group B received 16 - group C received 12.5 - group D received 38 Even with phantom 2, group B and C has displayed poor image quality. Conclusion : Both experiments using phantom 1 and 2 have shown that the most strong factor that control and influence the image quality are the filming equipments. Especially, the developing system has most powerful influence above all.

• Journal of Software Assessment and Valuation
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• v.16 no.2
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• pp.99-107
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• 2020

An underground integrated map is being built for underground safety management and is being updated periodically. The map update proceeds with the procedure of deleting all previously stored objects and saving newly entered objects. However, even unchanged objects are repeatedly stored, deleted, and stored. That causes the delay of the update time. In this study, in order to shorten the update time of the integrated map, an updated object and an unupdated object are separated, and only updated objects are reflected in the underground integrated map, and a system implementing this technology is described. For the updated object, an object comparison method using the center point of the object is used, and a quad tree is used to improve the search speed. The types of updated objects are classified into addition and deletion using the shape of the object, and change using its attributes. The proposed system consists of update object detection, extraction, conversion, storage, and history management modules. This system has the advantage of being able to update the integrated map about four times faster than the existing method based on the data used in the experiment, and has the advantage that it can be applied to both ground and underground facilities.

• English Language & Literature Teaching
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• v.17 no.2
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• pp.59-77
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• 2011

In recent years, as many native English speakers are working in Asia to as English teachers, team teaching with local teachers has been commonly implemented within the Korean EFL classroom. Using qualitative case studies, this paper aims to explore native English-speaking teachers' (NESTs) perceptions of team teaching and their challenges at different secondary Korean schools. The study documents the challenges faced by three foreign teachers embedded in intercultural teaching teams. The data shows that common challenges include vague role distribution among teachers, problems presented by mixed levels of students, large classes, and students' low valuation during foreign teacher's classes, which go ungraded. The study calls for serious governmental efforts to change these fundamental problems and closely examine local factors that strongly affect team teaching practices before initiating a system of importing foreign teachers without proper preparation.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2002.11a
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• pp.251-256
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• 2002

최근 들어 정보통신산업의 발달과 더불어 벤처기업 및 소규모 중소기업이 가지고 있는 기술의 가치측정 및 이를 바탕으로 한 기업의 가치측정에 관한 요구가 많이 늘어나고 있다. 하지만 이러한 기업들이 가지고 있는 기술들은 생명공학, 정보통신, 나노관련기술 등 기존의 전통적인 가치평가기법으로 가치를 평가하기 어려운 기술들이다. 따라서 이러한 첨단 기술들의 가치평가를 위한 새로운 전근방법 및 시각이 대두되고 있다. 본 연구에서는 기존에 존재하는 기술가치평가방법을 기초로 좀 더 체계적인 가치평가시스템에 대한 틀을 제시하고, 이러한 틀을 기초로 한 새로운 형태의 기술가치평가시스템을 제안하고자 한다.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.287-288
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• 2008

본 논문에서는 900MHz 대역의 RFID 시스템을 생산하는 대표적인 두 제조사의 제품을 선정하여 다양한 관점에서 성능을 측정하였다. 인식률 시험과 인식범위 시험으로 구분하여 8개 항목에 걸쳐 실험을 수행한 결과 A, B사 모두 태그부착 재질이 철재 및 알루미늄일 때, 태그가 겹쳐졌을 때, 태그 CHIP이 손상되었을 때 태그 인식이 되지 않았다. 그리고 시험환경 및 조건에 따라 다양한 인식률 변화에 대한 데이터를 도출 하였다.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.412-417
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• 2007

The energy efficiency and environment-friendly aspect of the railway system would be superior to other on-land transportation systems. In a preliminary feasibility study stage, the energy efficiency and problems related with environment are usually not considered. Selection of optimal railway line is taken into consideration include of the purpose of railway, geographical features and facility of management. The railway Alignment which could be reasons of environmental problems are focused and studied in this paper. This study performed opinions of specialists, checking of industrial environment, analysis of bid guideline to select the optimal line and executed AHP method to make quality model and choose weight factors. The investment for railway systems could be encouraged by the considering of main environmental elements evaluated with the modified noise and vibration standard for environment-friendly railway construction.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.942-945
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• 2007

유비쿼터스 환경에서 여러 종류의 센서들은 우리에게 많은 이점들을 주며 우리 생활에 보다 친숙한 생활 형태로 발달하고 있다. 이러한 센서노드들의 활용범위는 너무 범위가 넓기 때문에 지금 까지도 여러분야가 계발 중에 있다. 이러한 분야들 중 자동화 관리 시스템 분야는 대부분이 공업과 관련된 분야의 연구가 활발히 진행되어 왔다. 그 주류로서의 분야는 대부분 제조 공정의 자동화가 대부분을 차지하고 있었으며 일부분의 타 관리 시스템이 존재 하는 형태로 진행되어 왔다. 이러한 동향은 최근들어 유비쿼터스에 관한 많은 관심속에 우리와 밀접한 관련이 있는 실생활에 점점 도입되고 있다. 하지만 1차산업과 관련한 자동화 관리 시스템의 개발은 아직도 미비한 수준에 있으며, 이 또한 외국에서 개발된 상품을 수입하여 적용시키는 단계에 머물러 있는 것이 현재의 1차 산업의 관리 시스템의 실정이다. 이에 본 논문에서는 우리의 1차 산업과 관련된 분야에 적용 가능한 센서를 이용한 관리 시스템을 설계하고 이를 평가하고자 관리 시스템을 설계하였으며, 이에 따른 효용성을 평가 하였다.

• Journal of Korean Society of Rural Planning
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• v.14 no.1
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• pp.43-50
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• 2008

The dichotomous-choice contingent valuation method is applied to estimate the landscape value of Jeju mandarin(orchard). A distribution-free approach, Turnbull empirical distribution model, is employed to solve negative willingness to pay and truncation problems. The data used are collected from the interviews with tourist about willingness-to-pay at the various donation amount levels of Jeju mandarin(orchard)'s landscape value. The evaluation result is shown that the average amount of willingness to pay for the Jeju mandarin's landscape value is 12,926 won per person with standard deviation of 1,874.7 won/person. When the number of Jeju visitors is considered, the economic value of Jeju mandarin's landscape rises every year(2005:64.89 billion won, 2011: 84.43 billion won). The average economic value of Jeju mandarin's landscape are estimated 59.65 billion won during 2000-2005 and 76.88 billion won during 2006-2011, respectively.

• Journal of Korean Society of Rural Planning
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• v.13 no.4
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• pp.1-8
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• 2007

The dichotomous-choice contingent valuation method is applied to estimate the landscape value of Jeju Island's stonewall fencing farming land. A distribution-free approach, Turnbull empirical distribution model, is employed to solve negative willingness to pay and truncation problems. The data used are collected from the interviews with tourist about willingness-to-pay at the various donation amount levels of Jeju stonewall's landscape value. The evaluation result is shown that the average amount of willingness to pay for the Jeju stonewall fencing farming land is 3,001 won per meter with standard deviation of 511.0 won/m.

• Journal of The Korean Society of Agricultural Engineers
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• v.51 no.4
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• pp.1-6
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• 2009

This study analyzed and evaluated the effect of agricultural water reduction by introducing automated agricultural water management using alternative cost approach. The approach is possible to evaluate none market property as an asset. The saved agricultural water was evaluated as none market property. As the alternative goods, Seongju and Donghwa dam, typical irrigation dams in domestic, were employed. The economic benefit from water saving effect of an automated agricultural water management was calculated as depreciation expense and maintaining cost of construction agricultural dam per saved agriculture water. As a result, the saved agriculture water was 8.5 million ton per year, and the economic benefit of it was $1.3{\sim}2.1$ million won.