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Electrochemical Hydrogenation Behavior of Surface-Treated Mg-based Alloys for Hydrogen Storage of Fuel Cell (연료전지의 수소저장용 마그네슘계 합금의 표면제어에 의한 전기화학적 수소화 거동 연구)

  • Kim, Ho-Sung;Lee, Jong-Ho;Boo, Seong-Jae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.7
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    • pp.46-52
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    • 2006
  • The effects of surface treatment on the hydrogen storage properties of a $Mg_2Ni$ alloy particle were investigated by the microvoltammetric technique, in which a carbon-filament microelectrode was manipulated to make electrical contact with the particle in a KOH aqueous solution. It was found that the hydrogen storage properties of $Mg_2Ni$ at room temperature were improved by the surface treatment with a nickel plating solution. The sodium salts(sodium phosphate and sodium dihydrogen citrate) contained in the nickel plating solution made the alloy form an amorphous-like state, resulting in an improved hydrogen charge/discharge capacity at room temperature as high as about 150[mAh/g] from the original value of 17[mAh/g]. Potential-step experiment was carried out to determine the apparent chemical diffusion coefficient of hydrogen atom($D_{app}$) in the alloy. Since the alloy particle we used here was a dense, conductive sphere, the spherical diffusion model was employed for data analysis. $D_{app}$ was found to vary the order between $10^{-8}{\sim}10^{-9}[cm^2/s]$ over the course of hydrogenation and dehydrogenation process.

Design and Implementation of Dynamic Screen Authoring Tool For Advanced Smartphone App (스마트폰 앱의 고급화를 위한 동적화면 저작도구 시스템의 설계 및 구현)

  • Kim, Byung-Soo;Kang, Mi-Ae;Lee, Bong-Rim
    • Proceedings of the Korea Information Processing Society Conference
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    • 2014.11a
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    • pp.1145-1148
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    • 2014
  • 최근 스마트폰 앱의 공급이 급속히 늘어남에 따라 사용자의 눈높이는 갈수록 높아지고 있다. 이에 따라 스마트폰 앱 공급자는 앱을 제작할 때 좀 더 유익한 기능을 제공하기 위하여 노력해야 함은 물론이고 사용자에게 좀 더 흥미를 유도할 수 있는 시각적인 요소를 부각시키기 위하여 많은 노력을 기울여야 한다. 그런 시각적인 요소를 프로그램 개발자가 코드 구현만으로 표현하기에는 많은 어려움이 따르며 개발 기간이 그만큼 늘어나게 된다. 본 논문에서는 시각적인 측면에서 좀 더 고급화된 스마트폰 앱을 제작하기 위하여 역동적이고 차별화된 앱을 제작할 수 있는 동적 화면 저작도구를 제안한다.

A study on the possibility of recycling waste clothes using a virtual closet app (가상 옷장 앱을 이용한 폐의류 재활용 가능성에 관한 연구)

  • Eun-Bin Yu;Hyun-Joo Jo;Byung-In Choi;Dongok Kim
    • Proceedings of the Korea Information Processing Society Conference
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    • 2023.11a
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    • pp.876-877
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    • 2023
  • 3D 기술과 인공지능을 활용한 가상 옷장 앱 BBoM은 패스트패션의 환경 오염을 줄이고 지속 가능한 소비문화를 조성한다. 깊이 추정(depth estimation) 기술을 활용하여 2D 이미지를 3D 모델로 변환하였다. 이러한 기능은 소비자들의 소비 패턴에 도움을 줄 뿐만 아니라 1년 후에 연간탄소 배출량을 37% 감소시킬 수 있다.

Design of Loss-reduction Mechanisms for Energy Recovery Devices in Reverse-osmosis Desalination systems (역삼투 담수시스템용 에너지회수장치의 손실극복 메커니즘 설계)

  • Ham, Y.B.;Kim, Y.;Noh, J.H.;Shin, S.S.;Park, J.H.
    • Journal of Power System Engineering
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    • v.16 no.3
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    • pp.5-9
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    • 2012
  • Novel mechanisms for Energy Recovery Devices are proposed to diminish the pressure loss in the high-pressure reverse-osmosis system. In the beginning, the state-of-the-art in the design of Energy Recovery Devices is reviewed and the features of each model are investigated. The direct-coupled axial piston pump(APP) and axial piston motor(APM) showed 39% energy recovery at operating pressure of reverse osmosis desalination systems, 60 bar. Meanwhile, the developed PM2D model, in which APM pistons are arranged parallel to those of APP, is more compact and showed higher efficiency in a preliminary test. Loss-reduction mechanisms employing rod piston and double raw valve port are additionally proposed to enhance the efficiency and durability of the device.

Quantitative Evaluation Index Derivation of the Software Based on ISO/IEC 9126-2 Metrics (ISO/IEC 9126-2 메트릭을 활용한 소프트웨어 정량적 평가 지표 도출)

  • Cho, Sungho;Jang, Joongsoon
    • Journal of Applied Reliability
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    • v.16 no.2
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    • pp.134-146
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    • 2016
  • Purpose: Many domestic companies have to make out quantitative evaluation table in their proposal when they conduct the software R&D project. However, most of companies have a difficulty to select the evaluation items and criteria, also to derive a quantitative results. Therefore, we propose a method to derive the quantitative evaluation index by utilizing the ISO/IEC 9126-2. Methods: Analyzing ISO/IEC 9126-2, and we classify the quality metrics as high-classification and sub-classification for Web/App software, Embedded software and Installation software. Next, Conduct the metrics selection survey depending on importance and necessity. Then, carry out the case study. Verify the correspondence between evaluation items and criteria from original suggestion of company and from outcome by utilizing the ISO/IEC 9126-2 quality metrics. Results: It is possible to classify into two metrics, one for common software or one another for only special software. Furthermore, there is quality metrics that is more important and more necessary depending upon characteristics of the software. Conclusion: ISO/IEC 9126-2 quality metrics can be used to make an evaluation items and criteria for quantitative evaluation table of software product.

The Study of Utilty to 'Rolly Poly 160', Type II diabetes self-management Serious Game, Using Satisfaction Analysis (제2형 당뇨 식이 기능성 게임 '롤리폴리 160'의 효용성 및 만족도 조사 연구)

  • Ahn, Tae-Hong;Yu, Mi-Sun
    • Journal of Korea Game Society
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    • v.19 no.6
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    • pp.107-116
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    • 2019
  • A diabetes self-management serious game, 'Roly Poly 160' is developed for Type II diabetes patients to decrease their blood Sugar level. For verifying the effectiveness of 'Roly Poly 160', we examined the satisfaction survey. Data were collected from the diabetes patients and public those who have used 'Roly Poly 160' through D Community health center and S Community health center in Gwangju, from November, 27, 2018 to December, 4, 2018. 67 people returned the survey through the 'Roly Poly 160' APP. The overall average satisfaction level was 3.7 out of 5.

Analysis of Users' Utility on the Virtual Currency in Mobile Games: Focusing on S Mobile Game (모바일 게임 내 가상통화에 대한 이용자들의 효용 분석: S 모바일 게임을 중심으로)

  • Park, Jong-Won;Yoo, Chang-Sok;Yang, Sung-Byung
    • The Journal of Information Systems
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    • v.27 no.3
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    • pp.141-160
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    • 2018
  • Purpose The purpose of this study is to verify mobile game users' perceived utilities about real (price) and virtual (Ruby) currencies, which are the major factors of in-app purchase (IAP) widely used as a business model in a mobile game industry. Design/methodology/approach By using sales volume and sales frequency data for products sold in an 'S' mobile game from the 'D' mobile game company, we conducted a conjoint analysis according to the procedure recommended by Bicheno (2009). Findings The results of this study indicate that (1) mobile game users have greater utility for a virtual currency (Ruby) than for a real currency (price), (2) mobile game users' utility for virtual (Ruby) and real (price) currencies varies depending on sales volume and sales frequency, as well as (3) mobile markets (e.g., Google Play Store vs. Apple App Store), and (4) mobile game users have greater utility for a virtual currency (Ruby) which can be used readily than later.

The Development of Real-Time Leak Monitoring System for Management of Hazardous Material Pipeline (유해물질 이송관로 파손누출 실시간 예방 및 감시 기술개발)

  • Chae, Sookwon;Seo, Jaesoon;Kim, Joonseok
    • Journal of the Society of Disaster Information
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    • v.12 no.2
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    • pp.122-129
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    • 2016
  • In this study, a dual structured pipe for a preventive monitoring on a accident damage, a smartphone app program for a survey and a construction data collection and a server program for a real-time monitoring were developed. A pilot system was installed in the test field to analyze effects of a system developed in this study. The data for a damage prevention was detected by the attached sensors on the pipe. Exclusion was tested by the pressure sensors to be installed at regular intervals. The app and server programs was enabled to the real-time data collection and real-time monitoring linked by VRS survey equipments and a smartphone.

Ultrastructural Abnormalities in APP/PSEN1 Transgenic Mouse Brain as the Alzheimer's Disease Model

  • Kim, Mi Jeong;Huh, Yang Hoon;Choi, Ki Ju;Jun, Sangmi;Je, A Reum;Chae, Heesu;Lee, Chulhyun;Kweon, Hee-Seok
    • Applied Microscopy
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    • v.42 no.4
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    • pp.179-185
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    • 2012
  • Alzheimer's disease (AD) is a progressive neurodegenerative disorder. Neuropathological hallmarks of AD are amyloid plaques, dystrophic neurite, and alteration of subcellular organelles. However, the morpho-functional study of this degenerative process and ultimate neuronal death remains poorly elucidated. In this study, immunohistochemical and ultrastructural analyses were performed to clarify the abnormal morphological alterations caused by the progression of AD in APP/PSEN1 transgenic mice, express human amyloid precursor protein, as a model for AD. In transgenic AD mice brain, the accumulation of Amyloid ${\beta}$ plaques and well-developed dystrophic neurites containing anti-LC3 antibody-positive autophagosomes were detected in the hippocampus and cortex regions. We also found severe disruption of mitochondrial cristae using high-voltage electron microscopy and three-dimensional electron tomography (3D tomography). These results provide morpho-functional evidence on the alteration of subcellular organelles in AD and may help in the investigation of the pathogenesis of AD.

A Study on the Applications of ICT/IoT for Jeju Haenyeo Culture, an UNESCO Intangible Cultural Heritage

  • Yoo, Jae Ho;Jung, Yeon Kyu
    • Journal of Information Technology Services
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    • v.16 no.4
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    • pp.213-222
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    • 2017
  • The advancement of ICT is changing every field of life. It becomes possible with the penetration of personalized devices, that is, smartphone. The boom of IoT will come when there exist diversified and personalized services. In general, we might admit that it is needed that the more privatized services than the overall serviced. Jeju Island is the only one special self-governing province in Republic of Korea and deserves to be proud of the unique culture from its long historical background. One of the very regional culture which performs by women divers, Haenyeo activity or culture, was registered as Intangible Cultural Heritage. When authors were researched Jeju Haenyeo as a worthy reserving service, we recognized that it has never considered to use any point of ICT/IoT yet. Because IoT holds the high potentiality to create any service scenario between interesting groups. We will design a few services for Haenyeo which covers their job territory or daily life, adopts up-to-date technology or method such as sensored network, smart contract and App/Web. In this paper, we intent to show the simplicity and easiness of the application of IoT not to much inconspicuous target. So, we suggest a specialized IoT service for the reservation and promotion of Haenyeo Culture. This service would be composed of sensors, IoT network and App/Web at home and office. This service can be used among interesting groups : Haenyeo, policy maker, manufacturer, service provider and culture consumer.