• 시스템엔지니어링학술지
• /
• 제11권1호
• /
• pp.41-48
• /
• 2015

It is generally recommended to use EVM as an efficient means for measuring project performance and progress so that the EVMS user could manage his project successfully. In spite of it's favorable intention, most project participants think it as a heavy load or a sub practiced job with low responsibility. Especially in a weapon system R&D project, the manager should consider a possibility to change plans in the middle of the project because of uncertainty coming from properties of the R&D project. Even though there are lots of variables triggering unpredictable troubles in EVM application, EVM still could be a valuable project health indicator. In this paper we introduce a case study of EVM application for weapon system development project. Furthermore, we suggest several solutions for the issues occurring in utilizing EVM.

• EDISON SW 활용 경진대회 논문집
• /
• 제6회(2017년)
• /
• pp.194-203
• /
• 2017

The center of percussion(COP) is the point of an extended massive object attached to a pivot where a perpendicular impact will produce no reactive shock at the pivot. COP is an important concept in the field of vibration and dynamics. In vibration, COP causes reduction of vibration and in dynamics, it brings about maximum speed of an object. Many studies about COP are still in progress. However most of the researches have typically focused on the method of mathematical and numerical anlalysis. In this paper, impact analysis was proved by the mechanical energy method using EDISON co-rotational plane beam transient analysis program. The result expressed in acceleration was the relative magnitude of the impulse, which was the indicator of COP. Then, these results were compared with the reference thesis results for exact consequences. Additionally, parametric study of COP was conducted.

• Tuberculosis and Respiratory Diseases
• /
• 제83권3호
• /
• pp.195-200
• /
• 2020

The disease concept of interstitial lung disease with idiopathic pulmonary fibrosis at its core has been relied on for many years depending on morphological classification. The separation of non-specific interstitial pneumonia with a relatively good prognosis from usual interstitial pneumonia is also based on the perception that morphology enables predict the prognosis. Beginning with dust-exposed lungs, initially, interstitial pneumonia is classified by anatomical pathology. Diagnostic imaging has dramatically improved the diagnostic technology for surviving patients through the introduction of high-resolution computed tomography scan. And now, with the introduction of therapeutics, the direction of diagnosis is turning. It can be broadly classified into to make known the importance of early diagnosis, and to understand the importance of predicting the speed of progression/deterioration of pathological conditions. For this reason, the insight of "early lesions" has been discussed. There are reports that the presence or absence of interstitial lung abnormalities affects the prognosis. Searching for a biomarker is another prognostic indicator search. However, as is the case with many chronic diseases, pathological conditions that progress linearly are extremely rare. Rather, it progresses while changing in response to environmental factors. In interstitial lung disease, deterioration of respiratory functions most closely reflect prognosis. Treatment is determined by combining dynamic indicators as faithful indicators of restrictive impairments. Reconsidering the history being classified under the disease concept, the need to reorganize treatment targets based on common pathological phenotype is under discussed. What is the disease concept? That aspect changes with the discussion of improving prognosis.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2016년도 춘계학술대회
• /
• pp.352-354
• /
• 2016

최근 스마트 기기의 발전과 함께 실내 위치 기반 서비스의 요구가 높아지고 있다. 이를 위해 블루투스 4.0의 BLE(Bluetooth Low Energy) 스펙에 추가된 iBeacon 기술을 이용한 실내 측위 시스템에 대한 연구가 활발히 진행되고 있다. 그러나 iBeacon과 수신 단말 사이의 거리 측정에 사용되는 RSSI(Received Signal Strength Indicator) 신호는 장애물과 같은 환경적 요인으로 부정확한 거리 측정의 문제점을 갖고 있다. 본 논문에서는 RSSI 신호의 신뢰성 증가를 위한 필터링 기술과 단말의 액세스 포인트 기능의 브로드캐스팅 신호를 이용하는 개선된 실내 측위 기법을 제안한다.

• 한국어병학회지
• /
• 제32권1호
• /
• pp.1-8
• /
• 2019

Rock bream iridovirus (RBIV) is a member of the Megalocytivirus genus that causes severe mortality to rock bream (Oplegnathus fasciatus) with characteristic clinical signs of spleen enlargement. In this study, we assessed spleen size and RBIV copy number patterns in RBIV-infected rock bream to determine lethal and safe levels of virus copy number/spleen index that may define disease progress. We found that rock bream infected with RBIV ($1.1{\times}10^7virus\;copy\;number/100{\mu}l$) and held at 29, 26, 23 or $20^{\circ}C$ exhibited significantly higher levels of spleen size compared to $17^{\circ}C$. In dead condition (100% mortality at $20{\sim}29^{\circ}C$), the spleen index ($spleen\;weight/fish\;weight{\times}100$) and virus copy number were 3.00~5.38 and $10^6{\sim}10^8/{\mu}l$, respectively. Conversely, in survived condition (0% mortality at $17^{\circ}C$), spleen index and virus copy number was as low as not-infected control ($0.34{\sim}1.22/10^0{\sim}10^1/{\mu}l$, respectively). These findings suggest that spleen index can be an indicator of disease severity of RBIV disease.

• 생태와환경
• /
• 제57권1호
• /
• pp.51-59
• /
• 2024

This note summarizes the application of zooplankton indices for water quality management and estimation based on main research topics of articles focusing on wetland ecosystems, topics that are remained poorly investigated in S. Korea. The aquatic ecosystem-based consists of indices that respond to different target environmental factors, including environmental disturbance. Among the major indicator species and biota, we reviewed that management strategy for the wetland environment has to be focused more on small-sizes, in terms of zooplankton ecology and indices. The ecology of zooplankton communities in freshwater ecosystem has been the focus of an increasing number of studies since 2019, and considerable progress has been made in understanding the major mechanisms involved in regulating their abundance, diversity and spatio-temporal patterns. Even though studies on the freshwater ecosystem in Korea have a long history, a few of studies on zooplankton biota were conducted at wetlands. We suggested the candidate zooplankton indices proposed by the U.S. EPA and EU to suit Korean conditions. In the step of selecting metrics, the best available metrics are species-related variables, such as composition and abundance, as well as richness and diversity. Overall, in spite of several limitations, the development of a plankton-based multivariate assessment method in Korea wetlands is possible using mostly field research data. Later, it could be improved based on qualitative metrics on zooplankton, and with the emergence of further survey data. The present information can be used as basic information for researchers who are dealing with aquatic environments and its interaction with organisms.

• Journal of Construction Engineering and Project Management
• /
• 제5권2호
• /
• pp.11-15
• /
• 2015

The Last PlannerSystem (LPS) has been implemented on construction projects to increase work flow reliability, a precondition for project performance againstproductivity and progress targets. The LPS encompasses four tiers of planning processes:master scheduling, phase scheduling, lookahead planning, and commitment / weeklywork planning. This research highlights deficiencies in the current implementation of LPS including poor lookahead planning which results in poor linkage between weeklywork plans and the master schedule. This poor linkage undetermines the ability of theweekly work planning process to select for execution tasks that are critical to projectsuccess. As a result, percent plan complete (PPC) becomes a weak indicator of project progress. The purpose of this research is to improve lookahead planning (the bridgebetween weekly work planning and master scheduling), improve PPC, and improve theselection of tasks that are critical to project success by increasing the link betweenShould, Can, Will, and Did (components of the LPS), thereby rendering PPC a betterindicator of project progress. The research employs the case study research method to describe deficiencies inthe current implementation of the LPS and suggest guidelines for a better application ofLPS in general and lookahead planning in particular. It then introduces an analyticalsimulation model to analyze the lookahead planning process. This is done by examining the impact on PPC of increasing two lookahead planning performance metrics: tasksanticipated (TA) and tasks made ready (TMR). Finally, the research investigates theimportance of the lookahead planning functions: identification and removal ofconstraints, task breakdown, and operations design.The research findings confirm the positive impact of improving lookaheadplanning (i.e., TA and TMR) on PPC. It also recognizes the need to perform lookaheadplanning differently for three types of work involving different levels of uncertainty:stable work, medium uncertainty work, and highly emergent work.The research confirms the LPS rules for practice and specifically the need to planin greater detail as time gets closer to performing the work. It highlights the role of LPSas a production system that incorporates deliberate planning (predetermined andoptimized) and situated planning (flexible and adaptive). Finally, the research presents recommendations for production planningimprovements in three areas: process related, (suggesting guidelines for practice),technical, (highlighting issues with current software programs and advocating theinclusion of collaborative planning capability), and organizational improvements(suggesting transitional steps when applying the LPS).

• 문화기술의 융합
• /
• 제9권6호
• /
• pp.1173-1178
• /
• 2023

현대 사회에서는 효율성을 강조하여 조직 내 팀 프로젝트와 개인 업무를 세부 계획으로 이끄는 경향이 있다. 24시간 일상에서 시간을 효과적으로 활용하는 능력은 성실함의 지표로 여겨지며, 사람들은 계획적이고 조직적인 사람들을 모방하고 다양한 시스템을 활용하여 일상을 관리하려고 노력한다. 주어진 업무를 효율적으로 수행하려는 이유는 정해진 기간 내에 작업을 완료함으로써 프로젝트의 성패에 영향을 미치기 때문이다. 프로젝트 일정을 소홀히 할 경우, 성공적인 결과를 위협하는 큰 위험으로 여겨집니다. 이는 조직의 대형 프로젝트뿐 아니라 개인의 생활에서도 같이 적용되며, 시간 기반의 효율적인 관리를 강조하는 다양한 일정 관리 도구를 활용한다. 프로젝트 관리에서는 단순히 '오늘'을 기준으로 하는 것이 아니라 세부 업무 진행 상황을 주의 깊게 파악하는 것이 필요하다. 본 논문에서는 우리는 사용자가 속한 프로젝트에 날짜가 아닌 업무 단위로 접근하여 일정을 관리할 수 있는 안드로이드 애플리케이션을 제안하고 그 구현 내용을 소개한다. 본 논문에서 우리가 구현한 애플리케이션은 사용자가 속한 프로젝트를 등록하여 프로젝트의 목표 및 일정을 관리할 수 있다. 더불어, 프로젝트 전체 또는 개별 목표 진행률을 가시화하여 업무에 효율적으로 접근할 수 있는 기능을 제공한다. 이로써 사용자들은 본 논문에서 우리가 제안하는 애플리케이션을 활용하여 본인이 속한 프로젝트에 전념하며 업무 단위로 일정을 관리함으로써 프로젝트의 전반적인 효율을 향상할 수 있다.

• 한국도로학회논문집
• /
• 제13권3호
• /
• pp.65-73
• /
• 2011

최근 들어 도로포장의 품질 개선을 위해 성능보증 계약제도를 도입하려는 연구가 활발히 진행되고 있다. 성능보증 계약제도는 구조물이 준공 이후부터 일정한 공용기간 동안 미리 정해진 성능수준을 유지할 것을 시공자가 보증하는 계약의 한 형태이다. 성능보증 계약제도는 구조물의 품질향상, 생애주기비용의 절감, 시공기술 개발 등에 기여하는 것으로 알려져 유럽 및 미국에서 사용이 증가되고 있다. 이 계약제도를 국내에 효과적으로 도입하기 위해서는 도로포장의 성능인자, 임계한도, 그리고 성능보증 기간에 대한 연구가 반드시 필요하다. 본 연구에서는 미국 미네소타, 인디애나, 플로리다 주의 콘크리트 포장 성능보증계약제도에 관한 문헌을 조사하였다. 국내 21개 고속국도 노선의 줄눈 콘크리트 포장 구간에서 포장성능에 영향을 미치는 주요 파손을 조사 및 분석하여 해외의 성능인자, 임계한도, 그리고 성능보증 기간과 비교하였다. 계획된 구간에서 장기간에 걸쳐 조사가 실시된다면 보다 정확한 비교가 가능할 것으로 예상된다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제24권6호
• /
• pp.739-743
• /
• 2011

The aim of this paper was to estimate genetic parameters for body weight and five body measurements for an experimental population of Iranian Makooei sheep maintained at the Makooei Sheep Breeding Station at Makoo, Iran. To do this, yearling live weight (YW), and five body measurements, i.e., body length (BL), heart girth (HG), height at withers (HW), height at back (HB) and scrotal circumference (SC), were analyzed in a multi-trait animal model using the DXMUX program of DFREML software package. Heritability estimates were $0.22{\pm}0.08$, $0.11{\pm}0.06$, $0.21{\pm}0.07$, $0.17{\pm}0.06$, $0.17{\pm}0.06$ and $0.32{\pm}0.10$ for YW, BL, HG, HW, HB and SC, respectively. These estimates indicate that selection in Makooei sheep would generate moderate genetic progress in body weight and body measurements. Scrotal circumference, as an indicator of reproductive potential, exhibited the highest heritability. This trait, therefore, could successfully be used to increase productivity of males and, indirectly, female fertility. Genetic correlations between traits studied were all positive and ranged from 0.15 (YW/HB) to 0.99 (HW/HB). Phenotypic correlations were also positive and ranged from moderate (0.32, HW/SC) to high (0.94, HW/HB). Positive genetic and phenotypic correlations indicate that improvement in body measurements both at the genetic and phenotypic levels is expected through selection on body weight and vice versa.