• Journal of IKEEE
• /
• v.23 no.1
• /
• pp.1-8
• /
• 2019

In this paper, the electrical characteristics with various C-rates are tested with a high power series battery pack comprised of 18650 cylindrical nickel cobalt aluminum(NCA) lithium-ion battery. The electrical characteristics of discharge capacity test with 14S1P battery pack and electric vehicle (EV) cycle test with 4S1P battery pack are compared and analyzed by the various of C-rates. Multiple linear regression is used to estimate voltage imbalance of 14S1P and 4S1P battery packs with various C-rates based on experimental data. The estimation accuracy is evaluated by root mean square error(RMSE) to validate multiple linear regression. The result of this paper is contributed that to use for estimating the voltage imbalance of discharge capacity test with 14S1P battery pack using multiple linear regression better than to use the voltage imbalance of EV cycle with 4S1P battery pack.

• Journal of the Microelectronics and Packaging Society
• /
• v.27 no.4
• /
• pp.1-10
• /
• 2020

This paper reviews the recent development of electronic textile technology, mainly focusing on chip-textile bonding. Before the chip-textile bonding, a circuit on the textile should be prepared to supply the electrical power and signal to the chip mounted on the fabrics. Either embroidery with conductive yarn or screen-printing with the conductive paste can be applied to implement the circuit on the fabrics depending on the circuit density and resolution. Next, chip-textile bonding can be performed. There are two choices for chip-textile bonding: fixed connection methods such as soldering, ACF/NCA, embroidery, crimping, and secondly removable connection methods like a hook, magnet, zipper. Following the chip-textile bonding process, the chip on the textile is generally encapsulated using PDMS to ensure reliability like water-proof.

• Journal of the Semiconductor & Display Technology
• /
• v.22 no.1
• /
• pp.28-32
• /
• 2023

Recently, the use of stable lithium nanostructures as substrates and electrodes for secondary batteries can be a fundamental alternative to the development of next-generation system semiconductor devices. However, lithium structures pose safety concerns by severely limiting battery life due to the growth of Li dendrites during rapid charge/discharge cycles. Also, enabling long cyclability of high-voltage oxide cathodes is a persistent challenge for all-solid-state batteries, largely because of their poor interfacial stabilities against oxide solid electrolytes. For the development of next-generation system semiconductor devices, solid electrolyte nanostructures, which are used in high-density micro-energy storage devices and avoid the instability of liquid electrolytes, can be promising alternatives for next-generation batteries. Nevertheless, poor lithium ion conductivity and structural defects at room temperature have been pointed out as limitations. In this study, a low-dimensional Graphene Oxide (GO) structure was applied to demonstrate stable operation characteristics based on Li+ ion conductivity and excellent electrochemical performance. The low-dimensional structure of GO-based solid electrolytes can provide an important strategy for stable scalable solid-state power system semiconductor applications at room temperature. The device using uncoated bare NCA delivers a low capacity of 89 mA h g-1, while the cell using GO-coated NCA delivers a high capacity of 158 mA h g−1 and a low polarization. A full Li GO-based device was fabricated to demonstrate the practicality of the modified Li structure using the Li-GO heterointerface. This study promises that the lowdimensional structure of Li-GO can be an effective approach for the stabilization of solid-state power system semiconductor architectures.

• The Korean Journal of Nuclear Medicine
• /
• v.32 no.4
• /
• pp.344-353
• /
• 1998

Purpose: The purpose of this study was to evaluate the diagnostic accuracy of Tc-99m labeled antigranulocyte antibody immunoscintigrapy in the diagnosis of osteomyelitis and compare with the results of triphasic bone scan. Materials and Methods: The study population was 39 patients (22 male, 17 female) who had uncertain diagnoses of osteomyelitis. Fifteen patients had history of orthopedic surgery, and 5 had previous fracture. One milligram of monoclonal antibody against NCA-95 was labeled with 370 MBq of Tc-99m, injected intravenously, and 4 hour images were obtained. Triphasic bone scan images were obtained in 30 patients. The final diagnosis was confirmed by bacteriologic culture, biopsy or long term clinical follow up. Results: Twenty one patients were confirmed to have osteomyelitis (1 acute, 20 chronic). Eighteen patients were without osteomyelitis. Antigranulocyte antibody immunoscintigraphy had a sensitivity of 71% (15/21), and a specificity of 89% (16/18), while the sensitivity and specificity of triphasic bone scan was 93% (13/14) and 38% (6/16), respectively. Antigranulocyte antibody scan showed higher specificity of 100% (11/11) in comparison with 33% (3/9) of triphasic bone scan in patients with history of orthopedic surgery or fracture. Conclusion: Antigranulocyte antibody immunoscintigraphy is more specific than that of triphasic bone scan and may be helpful in patients with history of surgery or fracture. However, sensitivity is lower than triphasic bone scan in the detection of chronic osteomyelitis.

• Journal of Information Technology Applications and Management
• /
• v.11 no.2
• /
• pp.45-64
• /
• 2004

Many researchers have proved that information systems auditing is a very effective tool for improving information systems quality. However, information system auditing in Korea still includes many subjective judgements. This study deals with applying a quantitative model to improve information system auditing quality on security domain. First of all, we have looked at previous researches on information systems audit, especially on security audit. Based on this survey, we have come up with solutions to improve the evaluation efficiency on security audit. We have merged the security audit guidelines of NCA and KISA, and developed a quantified evaluation scheme. We have proved the validity of this model by interviews with experts and by case studies.

• 한국IT서비스학회:학술대회논문집
• /
• 2002.11a
• /
• pp.297-303
• /
• 2002

최근 전세계적으로 B2B 시장의 규모가 커짐에 따라 기업들간의 e-비즈니스를 실현하기 위한 환경 구축 및 e-비즈니스 솔루션의 필요성이 증대하고 있다. 기업간의 전자거래는 둘 이상의 거래 파트너들간에 이루어지는 정보의 등록, 메시지 및 문서 교환 등을 기반으로 이루어지는 것으로 거래의 기반이 되는 e-비즈니스 솔루션들간의 상호운용성이 가장 핵심이라 할 수 있다. 이러한 상호 운용성은 e-비즈니스 프레임워크에 대한 표준의 정립을 기점으로 표준에 적합한 e-비즈니스 솔루션의 구현, 도입 및 활용에 의해서 가능하다. 본 논문에서는 e-비즈니스 솔루션의 상호운용성 확보를 위한 기반이 되는 e-비즈니스 솔루션에 대한 표준적합성 테스트의 필요성을 제시하고, 실제로 테스트 환경을 구축하기 위한 방안을 제시한다. 그리고 더 나아가 e-비즈니스 솔루션의 표준적 합성 테스트 환경이 인증 체계로 발전하기 위한 절차를 보여준다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2002.11b
• /
• pp.1099-1102
• /
• 2002

최근의 정보화 사업들은 인터넷 환경을 기반으로 하여, 웹 시스템으로 구축되고 있다. 그러나 웹 환경은 그 개방성으로 인하여 보안이 매우 취약하지만, 보안에 대한 체계적으로 정립된 보안모델이 없어 정보화사업마다 나름대로의 보안 모델을 만들어 적용하고 있다. 이렇게 자체적으로 정의한 보안모델은 구성 정도에 따가 취약성을 내포할 수 있으며, 일부 시스템 보안성에 문제가 발생하면 네트워크로 연결된 다른 시스템에도 문제가 전이치는 사례를 초래할 수 도 있다. 이러한 문제를 해결하기 위하여 부 연구에서는 정보화 사업들의 보안성 향상을 위하여 지켜야 하는 최소한의 보안 모델을 표준과 함께 제시하고자 한다.

• Proceedings of the KIPE Conference
• /
• 2018.11a
• /
• pp.125-126
• /
• 2018

본 논문에서는 원통형 NCA 리튬이온 배터리로 제작된 고출력 직렬조합 배터리팩으로 C-rate에 따른 전기적 특성 실험을 수행하였다. 방전 용량 프로파일 실험을 통해 배터리팩의 충/방전 C-rate가 배터리팩의 내부 파라미터에 어떠한 영향을 주는지 비교 분석한다. 실험을 통해 방전 용량과 전압 편차 파라미터를 측정한다. 전압 편차 그래프는 만방 구간과 만방 이후 휴지 구간의 셀 간 전압 편차를 중심으로 관찰하며 두 구간의 전압 편차를 비교한다. 3가지 파라미터를 비교하여 가장 효율적인 C-rate를 알아보았다.

• Journal of the Korea Computer Industry Society
• /
• v.3 no.5
• /
• pp.605-610
• /
• 2002

In this paper, we propose a Internet filtering tool which allows parents to manage their children's Internet access, block access to Internet sites they deem inappropriate. The other filtering tools which like Cyber Patrol, NCA Patrol, Argus, Netfilter are oriented only URL filtering or keyword detection methods. Thease methods are used on limited fields application. But our approach is focus on image color space model. First we convert RGB color space to HLS(Hue Luminance Saturation). Next, this HLS histogram learned by our classification method tools which include cohesion factor, naive baysian, N-nearest neighbor. Then we use voting for result from various classification methods. Using 2,000 picture, we prove that 2-layer voting result have better accuracy than other methods.

• Journal of Internet Computing and Services
• /
• v.5 no.5
• /
• pp.39-48
• /
• 2004

For transporting real-time multimedia traffic, RTP is considered as one of the most promising protocols operating at application layer. In order to manage and control the real-time multimedia traffic within networks, network managers need to monitor and analyze the traffic delivering through their networks. However, conventional traffic analyzing tools can not exactly classify and analyze the real-time multimedia traffic using RTP on the basis of real-time as well as non-real-time operations. In this paper, we propose an efficient online classification method of RTP packets, which can be used on high-speed network links. The accuracy and efficiency of the proposed methodhave been tested using captured data from a KIX node with 100 Mbps links, which interconnects between domestic and overseas Internet networks and is operated by NCA.