• 대한의용생체공학회:의공학회지
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• 제38권6호
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• pp.291-294
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• 2017

It is known that laptop computer stand is helpful to maintain the good posture while using laptop computer on the desk. But the quantitative validation of its effect has not been reported. Using the wearable neck posture tracker, the forward flexion angle of the neck can be measured in daily life. In this study, the forward flexion angles of the neck while using the laptop computer with and without laptop computer stand were compared. From the posture data of 10 subjects for 6 hours, the average of the forward flexion angle was 0.9 degree with laptop computer stand and 16.3 degree without laptop computer stand. As the conclusion, laptop computer stand can decrease the forward flexion angle which is known as forward head posture while using the laptop computer on the desk.

• 한국기계가공학회지
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• 제15권1호
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• pp.89-94
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• 2016

This study investigates the durability of the radiator and cooler of a laptop through a thermal analysis. In the result of this study, the maximum deformation happened at the part holding up the support stand at the radiator and cooler. The maximum thermal stress of the cooler was 60.939 Mpa, as low as that of the radiator. In addition, the safety factor of the cooler was 1.64 times as high as that of the radiator. The radiator of the laptop was less durable than the cooler. The result of this study could help with designing a laptop model with a durable radiator and cooler.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2007년도 춘계학술대회
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• pp.154-159
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• 2007

This article focuses on the psychometric stability of the technology acceptance model (TAM) by Davis [8] when applied to laptop usage in the educational settings. Using a survey of 297 users, this research provides evidence that the TAM provides a model for a valid and reliable measure to use among students in assessing their perceptions of laptop usage. Given this evidence, those involved with implementation and training in laptop environment can confidently apply the instrument.

• 정보저장시스템학회논문집
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• 제5권2호
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• pp.76-81
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• 2009

Mobile devices have become an important part of daily life. This is especially true of laptop PCs, which are portable enough to be used almost anywhere. Laptop PCs, however, cannot be nomadic if each component is not robust enough to endure rugged laptop operating environment. Generally, external shock makes collision on head-disk interface and damage to read-write performance. To minimize the likelihood of failure, shock analysis must be incorporated into the design of hard disk drive in laptop. This research explores the structure modification of laptop HDD base, for improving shock performance using finite element analysis which considers the flexibility of whole HDD structure. FE model is verified by modal test and finely tuned. Then we obtained the transmitted acceleration of spindle and pivot and the relative displacement between disk and slider head as shock response. Based on shock simulation, the structural dynamics modification is performed and the primary design parameters are extracted.

• 한국융합학회논문지
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• 제11권11호
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• pp.189-194
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• 2020

본 연구에서는 노트북의 Model A,B,C에 대한 열응력 해석을 통하여 열에 대한 내구성을 고찰하였다. Model A는 일체형으로서 열을 받는 자판 부분이 가장 뜨겁고 열 받는 곳과 거리가 먼 모니터 부분이 가장 온도가 낮은 것을 보였다. Model B와 Model C에서는 열을 받는 자판부분만 모델링 하였기 때문에 전체적으로 뜨거워지는 것을 알 수가 있다. Model A의 경우는 노트북 자판의 두께가 더 두껍지만 변형이 제일 많이 나타났고 Model C는 두께가 가장 얇으면서도 응력과 변형이 가장 작게 나타났다. Model B의 경우는 응력이 제일 많았지만 변형은 비교적 적게 나타났다. 본 연구에서의 열해석 결과를 이용함으로서 내구성이 있는 노트북의 효율적인 최신 설계를 할 수 있다고 사료된다. 본 연구 결과를 노트북에 적용함으로서 열에 대한 노트북의 내구성을 평가할 수 있고 그 결과가 강성있는 노트북의 설계와 미적인 융합이 될 수 있다고 보인다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.261-263
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• 2007

Authentication is a mechanism to establish proof of identities, the authentication process ensure that. Who a particular user is. Nowadays PC and laptop user authentication systems are always done once a hold until s explicitly revoked by the user, or asking the user to frequently reestablish his identity which encouraging him to disable authentication. Zero-Interaction Authentication (ZIA) provides solution to this problem. In ZIA,. a user wears a small authentication token that communicates with a laptop over a short-range, wireless link. ZIA combine authentication with a file encryption. Here we proposed a Laptop-user Authentication Based Mobile phone (LABM). In our model of authentication, a user uses his Bluetooth-enabled mobile phone, which work as an authentication token that provides the authentication for laptop over a Bluetooth wireless link, m the concept of transient authentication with our combining It with encryption file system. The user authenticate to the mobile phone infrequently. In turn, the mobile phone continuously authenticates to the laptop by means of the short-range, wireless link.

• Journal of Power Electronics
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• 제13권1호
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• pp.31-39
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• 2013

The conventional non-isolated boost converter has some drawbacks such as poor dynamic performance and a discontinuous output current, which make it unsuitable for battery charging applications. In spite of its compactness and lightness, it is not preferred as a charger of portable electronic devices. In this paper, a non-isolated boost converter topology for Li-ion batteries suitable for fuel cell powered laptop computers is proposed and analyzed. The proposed converter has an additional inductor at the output to make a continuous output current. This feature makes it suitable for charger applications by eliminating the disadvantages of the conventional non-isolated boost converter mentioned above. A prototype of the proposed converter is built for the Li-ion battery charger of a laptop computer to prove the validity and advantages of the proposed topology.

• 문화기술의 융합
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• 제6권1호
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• pp.105-110
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• 2020

본 연구에서는 다양한 천연염색 재료로 염색한 한지직물을 활용하여 모자 두 개와 노트북 가방을 문화상품으로 개발·제작하였다. 그를 위하여 첫째, 우수한 내구성과 기능성을 가진 우리나라의 전통 한지로 만들어진 한지직물을 문화상품 개발을 위한 소재로 선택하고, 둘째, 그것을 천연염색 재료인 쪽으로 푸른 색, 떫은 감물로 갈색, 홍화에 의하여 붉은 색, 황벽으로 노란 색 그리고 자근으로 자주색으로 염색하였다. 셋째, 문화상품으로 개발하고자 하는 모자와 노트북 가방을 디자인하였다. 넷째, 디자인한 모자와 노트북 가방의 패턴을 제작하고, 그것에 따라 다양한 색으로 천연염색한 한지직물을 재단·봉제하여 완성한 두 개의 모자와 노트북 가방을 제시하였다.

• Journal of electromagnetic engineering and science
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• 제17권3호
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• pp.126-132
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• 2017

In this study, we designed, measured, and analyzed a rearranged L-shape magnetic resonance coupling wireless power transfer (MR-WPT) system for practical applications with laptops. The typical four resonator MR-WPT (Tx part: source loop and Tx coil; Rx part: Rx coil and load loop) is difficult to apply to small-sized stationary and mobile applications, such as laptop computers, tablet-PCs, and smartphones, owing to the large volume of the Rx part and the spatial restrictions of the Tx and Rx coils. Therefore, an L-shape structure, which is the orthogonal arrangement of the Tx and Rx parts, is proposed for indoor environment applications, such as at an L-shaped wall or desk. The relatively large Tx part and Rx coil can be installed in the wall and the desk, respectively, while the load loop is embedded in the small stationary or mobile devices. The transfer efficiency (TE) of the proposed system was measured according to the transfer distance (TD) and the misaligned locations of the load loop. In addition, we measured the TE in the active/non-active state and monitor-open/closed state of the laptop computer. The overall highest TE of the L-shape MR-WPT was 61.43% at 45 cm TD, and the TE decreased to 27.9% in the active and monitor-open state of the laptop computer. The conductive ground plane has a much higher impact on the performance when compared to the impact of the active/non-active states. We verified the characteristics and practical benefits of the proposed L-shape MR-WPT compared to the typical MR-WPT for applications to L-shaped corners.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.490-495
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• 2001

This paper deals with an analysis and countermeasure for improving the shock performance of laptop computers. The shock analysis is carried out by using the commercial program of LS-DYNA3D. Also the analysis is verified by the measurements from modal tests and shock tests. The available countermeasures are investigated theoretically and experimentally to find the effective methods of reducing the shock acceleration on hard disk driver during one side fall test. The hard disk drive is the most sensitive part in a laptop computer. This research shows the effects of the spring constant of rubber pad, the reinforcement of mechanical parts and the location of a hard disk driver, on the shock reduction.