• 센서학회지
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• 제21권5호
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• pp.339-344
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• 2012

This article describes a novel method for the detection of amyloid-${\beta}$($A{\beta}$) peptide that utilizes a photo-sensitive field-effect transistor (p-FET). According to a recent study, $A{\beta}$ protein has been known to play a central role in the pathogenesis of Alzheimer's disease (AD). Accordingly, we investigated the variation of photo current generated from p-FET with and without intracellular magnetic beads conjugated with $A{\beta}$ peptides, which are placed on the p-FET sensing areas. The decrease of photo current was observed due to the presence of the magnetic beads on the channel region. Moreover, a similar characteristic was shown when the Raw 264 cells take in magnetic beads treated with $A{\beta}$ peptide. This means that it is possible to simply detect a certain protein using magnetic beads and a p-FET device. Therefore, in this paper, we suggest that our method could detect tiny amounts of $A{\beta}$ for early diagnosis of AD using the p-FET devices.

• Nuclear Engineering and Technology
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• 제37권3호
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• pp.207-220
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• 2005

Nuclear power plants (NPP) are complex socio-technological systems that rely on the success of both hardware and human components. Empirical studies of plant operating experience show that human errors are important contributors to accidents and incidents, and that organizational factors play an important role in creating contexts for human errors. Current probabilistic safety assessments (PSA) do not explicitly model the systematic contribution of organizational factors to safety. As some countries, like the United States, are moving towards increased use of risk information in the regulation and operation of nuclear facilities, PSA quality has been identified as an area for improvement. The modeling of human errors, and underlying organizational weaknesses at the root of these errors, are important sources of uncertainty in existing PSAs and areas of on-going research. This paper presents a review of research into the following questions: Is there evidence that organizational factors are important to NPP safety? How do organizations contribute to safety in NPP operations? And how can these organizational contributions be captured more explicitly in PSA? We present a few past incidents that illustrate the potential safety implications of organizational deficiencies, some mechanisms by which organizational factors contribute to NPP risk, and some of the methods proposed in the literature for performing root-cause analyses and including organizational factors in PSA.

• The Journal of Asian Finance, Economics and Business
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• 제7권11호
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• pp.549-556
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• 2020

Real estate markets play an essential role in the economic development of both developed and developing countries. Investment decisions in private real estate demand the consideration of several qualitative and quantitative criteria. Especially in Vietnam, demand for housing, apartments are rising which has resulted because of the migration from rural to urban areas. This study aims to determine the influencing factors of the real estate purchasing behavior and then recommend a grey Multi-Criteria Decision Making (MCDM) support model to evaluate real estate alternatives based on a numerical example in Vietnam. A set of essential criteria are identified based on experts' opinion, and the proposed determinants are initial investment, maintenance cost, prestige location, distance to interesting places, parking lot, public transportation, property condition, total area size, number of rooms, and neighbors. The subjective weights were obtained by using the Decision-Making Trial and Evaluation Laboratory (DEMATEL) model, and the Grey Relational Analysis (GRA) technique is employed to prioritize and rank real estate alternatives. The results reveal that this approach can be useful to make purchasing decisions for many kinds of real estate property under uncertain business environments. These findings indicate that the presented hybrid model has advantages in granting flexibility to the preferences of decision makers.

• 중환자간호학회지
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• 제10권1호
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• pp.41-50
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• 2017

Purpose: The purpose of this study was to describe what critical care nurses perceived about life-sustaining treatment at end of life. Methods: A qualitative content analysis method was utilized. The unit of analysis was interview text obtained from fifty critical care nurses of a general hospital. Results: Seven categories in two content areas were abstracted. In the negative perception area, the following five categories were abstracted: patients' suffering, dying with damaged dignity, patients' isolation from family members, regret about choosing life-sustaining treatment, and family members' burden. In the positive perception area, the following two categories were abstracted: willingness to sustain life and duty as family members. Conclusions: Nurses have better competencies pertaining to understanding patients' responses and suffering than any other health care professions do. Nurses should play an important role in advocating for patients and their family in the process of end-of-life care decision making.

• Journal of Forest and Environmental Science
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• 제33권4호
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• pp.270-280
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• 2017

Selection of superior phenotypes of fruit trees and products based on established criteria by local people is a prerequisite for future species domestication and conservation. Thus the study objective was to identify the local people's perceptions and preferences on baobab trees and products. A sample of 142 respondents was randomly selected using structured interviews in Blue Nile and North Kordofan, Sudan in 2013. Descriptive analysis was employed using SPSS and Excel programs. The study results indicated that local people use the morphological characteristics of the tree (leaves, fruits, seeds, kernels and bark) to differentiate individual trees. Based on the perceptions, local people recorded trees with delicious leaves, white pulp color, big fruit size and mature capsule size, and high pulp yield as criteria for differentiating between baobab trees in the study areas. In contrast, the undesirable traits were connected to trees with acidic pulp, slimy pulp, bitter leaves, and low pulp yield. The study concluded that the ethnobotanical knowledge of the baobab tree and its products may play an important role in tree domestication and improvement in Sudan. However, further research on tree genetics is needed to complement the ethnobotanical knowledge for baobab resources domestication and conservation.

• Human Ecology Research
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• 제53권4호
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• pp.413-424
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• 2015

The purpose of this study was to examine the relationship between perceived parenting behaviors and dispositional gratitude of adolescent children in Korea. Participants consisted of 403 high school students from the Seoul and Gyeonggi areas. Dispositional gratitude of adolescents and parenting behaviors (including respect, lessons, attention, and lack of trust) were reported by adolescents. The data were analyzed using descriptive statistics, Pearson's correlations, and multiple regression analyses. The results were as follows. First, the average levels of parental lack of trust and maternal attention were different as a function of gender. Second, girls showed higher levels of dispositional gratitude than boys. Third, greater parental respect, lessons, and attention were linked to higher levels of dispositional gratitude of adolescent children; whereas lack of trust was linked to lower levels of dispositional gratitude. Fourth, paternal lessons was the most meaningful factor in explaining the level of dispositional gratitude in boys while maternal attention was the most meaningful factor in girls. These results suggest that parents play an important role in the development of dispositional gratitude in adolescents. Differential parental roles were discussed to promote the level of dispositional gratitude for adolescents.

• 한국대기환경학회지
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• 제27권4호
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• pp.416-425
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• 2011

To analyze the physical processes of sea-breeze development over a coastal urban area, numerical simulation for seabreeze (SB) and its frontogenesis was examined based on urbanized MM5 (uMM5) with urban canopy parameterization. On 6 August 2006, SB and its front were well developed in Busan under a weak offshore flow. As a result of wind vector, ZVB (Zero Velocity Boundary), potential temperature obtained the uMM5, at 0900 LST, SB advanced below 200 m height in the coastal areas and the internal boundary grew with the urban coastal region. At noon, the height of the SB head with updraft was approximately one and a half times (~600 m) higher than its depth in central urban. Applying the frontogenesis function, the SB structure for frontogenesis and frontolysis were complicated spatially; the dynamic effects of wind (i.e. convergence and tilting term) could play an important role in the growth of SB, especially the convergence effect.

• 한국정보과학회논문지:소프트웨어및응용
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• 제31권2호
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• pp.111-125
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• 2004

본 논문에서는 사용자 중심으로 환경맥락을 정의하고, 이를 기반으로 스마트 홈에서의 응용 서비스를 구현하였다 현재 스마트 홈 환경에 대한 연구가 여러 방면에서 진행되고 있으나 기존의 시스템들은 사용자 관점에서 바라보지 않고 사용자에 대한 환경맥락 정보의 이용이 부족하며 시스템 구축비용을 고려하지 않았다. 따라서 본 논문에서는 각 사용자의 의도에 따른 구별화 된 서비스를 구현하기 위해서 ubi-UCAM을 기반으로 다수의 센서에서 생성되는 환경맥락 정보를 다수의 응용서비스에서 동시에 이용할 수 있는 사용자 중심의 응용 서비스를 구현하고 유용성을 검증하였다. 구현된 응용 서비스는 환경맥락 정보에 따르는 센서/응용 서비스의 분산설계로 인하여 센서와 서비스 사이의 독립성을 보장하고 다수의 응용서비스들의 통합이 가능하기 때문에 다양한 응용 분야에 적용하기 쉽고 통합적인 미래형 스마트 홈 환경의 기반을 마련하게 될 것이다.

• Journal of Information Processing Systems
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• 제16권3호
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• pp.733-741
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• 2020

A smart dust monitoring system is useful for obtaining information on rough terrain that is difficult for humans to access. One of ways to deploy sensors to gather information in smart dust environment is to use an aircraft in the Amazon rainforest to scatter an enormous amount of small and cheap sensors (or smart dust devices), or to use an unmanned spacecraft to throw the sensors on the moon's surface. However, scattering an enormous amount of smart dust devices creates the difficulty of managing such devices as they can be scattered into inaccessible areas, and also causes problems such as bottlenecks, device failure, and high/low density of devices. Of the various problems that may occur in the smart dust environment, this paper is focused on solving the bottleneck problem. To address this, we propose and construct a three-layered hierarchical smart dust monitoring system that includes relay dust devices (RDDs). An RDD is a smart dust device with relatively higher computing/communicating power than a normal smart dust device. RDDs play a crucial role in reducing traffic load for the system. To validate the proposed system, we use climate data obtained from authorized portals to compare the system with other systems (i.e., non-hierarchical system and simple hierarchical system). Through this comparison, we determined that the transmission processing time is reduced by 49%-50% compared to other systems, and the maximum number of connectable devices can be increased by 16-32 times without compromising the system's operations.

• 한국멀티미디어학회논문지
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• 제10권9호
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• pp.1175-1184
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• 2007

기초적인 조형 교구인 브릭 제품이 현재는 사용자 계층의 확장에 성공하며, 특유의 가변성과 타 분야와의 뛰어난 연계성을 장점으로 다양한 분야와 독창적인 방식으로의 접목을 시도하고 있다. 하지만 실제로 브릭에 대한 기존의 연구는 그 가치이외의 무한한 가변성과 다변화 차원에서의 연구가 부족하다. 본 연구는 이 같은 인식하에 브릭의 본질적 속성에 관한 이론적 근거를 기반으로 보다 진화한 미래형 브릭 시스템의 현황을 제시하고 체계적으로 분석하는 방식으로 진행하였다. 최종적으로는 3D브릭시스템을 활용한 VR 디자인을 구현해보는 프로세스를 수행하였다. 브릭 시스템의 '다변화 및 확장성'에 관한 연구는 브릭의 미래적 가능성과 활용성을 파악하는데 중요한 자료를 제공 할 것이다.