• 한국반도체및디스플레이장비학회:학술대회논문집
• /
• 한국반도체및디스플레이장비학회 2005년도 추계 학술대회
• /
• pp.183-187
• /
• 2005

Thin films of diblock copolymers may be suitable for semiconductor device applications since they enable patterning of ordered domains with dimensions below photolithographic resolution over wafer-scale area. We obtained nanometer-scale cylindrical structure of dibock copolymer of polystyrene-block-poly(methylmethacrylate), PS-b-PMMA, also demonstrate pattern transfer of the nanoporous polymer using both reactive ion etching. The size of fabricated naonoholes were about 10 nm. Fabricated nanopattern surface was observed by field emission scanning electron microscope (FESEM).

• 대한임베디드공학회논문지
• /
• 제6권4호
• /
• pp.255-261
• /
• 2011

In this paper, we propose a security-enhanced storing method for the voice data obtained during the flight. When an emergency occurs during flight, the flight data in the storage device such as DTS or Blackbox can be exposed to antagonist or enemy. Currently, zeroize function is embedded in these devices in order to prevent this situation. However, this could not be operated if the system is malfunctioned or the pilot is wounded in the emergency. In order to solve this problem, the voice data compressed by the ADPCM is encrypted in the proposed method composed of the AES algorithm and a reordering method. The simulation results show that the security for the voice date is further enhanced due to the proposed method.

• 한국군사과학기술학회지
• /
• 제22권2호
• /
• pp.233-240
• /
• 2019

High-altitude ElectroMagnetic Pulse(HEMP) is a high-power electromagnetic pulse caused by nuclear explosions at altitudes above 30 km. This pulse can cause serious damage to the electrical/electronic device. Therefore, there are a lot of studies on the effects of HEMP in the literature. When conducting studies on the effects of HEMP, it is essential to measure the simulated HEMP. Depending on the need for measurement, this paper focuses on the HEMP measurement method. This paper proposes a measurement method using frequency domain compensation to extract the correct waveform and solves the offset problem more efficiently than the conventional methods. The proposed method is verified by experiment using HEMP simulator and measurement system in ADD.

• International journal of advanced smart convergence
• /
• 제8권2호
• /
• pp.30-38
• /
• 2019

Recently, the spread of personal mobility has been rapidly increasing due to the development of environmentally friendly alternative transportation means. In addition, the level of battery technology is also rapidly developing, accelerating the popularization of personal mobility. Such personal mobility has convenience of location transfer, amusement, and high portability compared to other transportation devices. Most personal mobility, however, is made up of small wheels, which cannot overcome obstacles such as rugged roads or obstacles on the road. In this paper, to solve these problems, we tried to devise a device that can easily overcome obstacles by combining wheels with small moving means. The wheel size can be mounted on the front wheel of the small moving means in a protruding manner so that obstacles can be encountered before the front wheels and the safety and ride comfort of the running can be improved.

• Journal of information and communication convergence engineering
• /
• 제19권4호
• /
• pp.263-268
• /
• 2021

Although the compact capacitance model of point tunneling types of tunneling field-effect transistors (TFET) has been proposed, those of line tunneling types of TFETs have not been reported. In this study, a compact capacitance model of an L-shaped TFET (LTFET), a line tunneling type of TFET, is proposed using the previously developed surface potentials and current models of P- and L-type LTFETs. The Verilog-A LTFET model for simulation program with integrated circuit emphasis (SPICE) was also developed to verify the validation of the compact LTFET model including the capacitance model. The SPICE simulation results using the Verilog-A LTFET were compared to those obtained using a technology computer-aided-design (TCAD) device simulator. The current-voltage characteristics and capacitance-voltage characteristics of N and P-LTFETs were consistent for all operational bias. The voltage transfer characteristics and transient response of the inverter circuit comprising N and P-LTFETs in series were verified with the TCAD mixed-mode simulation results.

• 한국초전도ㆍ저온공학회논문지
• /
• 제24권4호
• /
• pp.78-83
• /
• 2022

REBCO coated conductors are widely used for HTS power application, high magnetic field magnet application, and etc. A thermal stability of the REBCO conductor is essential for the operation of HTS-based device, and thermal conductivities of the conductor are relevant parameters for modeling cryogenic heat transfer. REBCO conductors consist of a REBCO layer, copper layers for electrical stabilization and a hastelloy substrate. At cryogenic temperature, thermal conductivity of copper and silver strongly depend on the purity of the material and the intensity of the magnetic field. In this study, thermal conductivities of the laminated composite structure of REBCO conductor are evaluated by using the thermal network model and the multidimensional heat conduction analysis. As a result, the thermal network model is applicable to REBCO conductors configured in series or parallel alone and multidimensional heat conduction analysis is necessary for complex cases of series and parallel configuration.

• International Journal of Computer Science & Network Security
• /
• 제23권9호
• /
• pp.186-191
• /
• 2023

Neural Networks are widely used for huge variety of tasks solution. Machine Learning methods are used also for signal and time series analysis, including electrocardiograms. Contemporary wearable devices, both medical and non-medical type like smart watch, allow to gather the data in real time uninterruptedly. This allows us to transfer these data for analysis or make an analysis on the device, and thus provide preliminary diagnosis, or at least fix some serious deviations. Different methods are being used for this kind of analysis, ranging from medical-oriented using distinctive features of the signal to machine learning and deep learning approaches. Here we will demonstrate a neural network-based approach to this task by building an ensemble of 1D CNN classifiers and a final classifier of selection using logistic regression, random forest or support vector machine, and make the conclusions of the comparison with other approaches.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2021년도 추계학술발표대회
• /
• pp.446-448
• /
• 2021

In training a deep learning model, it is crucial to tune various hyperparameters and gain speed and accuracy. While hyperparameters that mathematically induce convergence impact training speed, system parameters that affect host-to-device transfer are also crucial. Therefore, it is important to properly tune and select parameters that influence the data loader as a system parameter in overall time acceleration. We propose an automated framework called Num Worker Tuner (NWT) to address this problem. This method finds the appropriate number of multi-processing subprocesses through the search space and accelerates the learning through the number of subprocesses. Furthermore, this method allows memory efficiency and speed-up by tuning the system-dependent parameter, the number of multi-process spawns.

• 한국컴퓨터정보학회:학술대회논문집
• /
• 한국컴퓨터정보학회 2022년도 제65차 동계학술대회논문집 30권1호
• /
• pp.295-296
• /
• 2022

물건을 나르는 데 있어 지게차 등 사람을 도울 수 있는 많은 장비들이 존재한다. 하지만 이러한 대형 장비들은 장소에 국한됨으로 좁은 장소에서는 인력이 필히 요구된다. 또, 장비를 다루기 위한 자격증의 필요를 동반한다. 본 논문은 불필요한 인력을 줄여 종사자들의 편의성을 높이고, 물건을 옮기는 데 있어 발생할 수 있는 인명피해를 감소시키기 위해 자격증 없이 좁은 장소에서도 종사자들의 관리하에 라인을 따라가며 원하는 도착 지점에 물건을 실어 나르는 라인트레이서를 제안한다. 기존의 대형 장비를 이용하고 상황에 따라 인력도 요구되었던 방식이 아닌 종사자와 라인트레이서의 입력을 통해 원하는 지점으로 물건을 나를 수 있고, 종사자의 편의성을 높여 능률 또한 함께 높일 수 있다.

• 한국수정란이식학회지
• /
• 제21권2호
• /
• pp.147-156
• /
• 2006

본 연구는 MOET 기법에 의해 우수한 한우로부터 다수의 수정란을 회수하여 농가의 소에 이식하므로서 우수한 유전 자원을 확산시키고자 실시하였다. 80두의 우수 한우 공란우를 선발하여, 발정 확인 후 황체기에 성선 자극 호르몬($Folltropin^(R)-V$)을 투여하는 기존의 과배란 처리법과 임의의 발정주기에 CIDR를 삽입하고 성선 자극 호르몬을 투여하는 새로운 과배란 처리법에 의한 수정란 생산 비교와 CIDR 삽입한 한우 공란우에서 성선 자극 호르몬 ($Antorin^(R)R10$)의 투여 용량의 차이 (36 mg vs 28 mg) 에 따른 수정란 생산 성적을 비교하였다. 한편, 우수 공란우로부터 채란된 신선 수정란 또는 동결-융해 수정란을 농가 수란우 226두에 이식하였으며, 이식 결과 수태율에 대한 수정란 상태(신선 vs 동결-융해), 년도, 이식 시술자, 계절, 농가에 대한 영향을 조사하였다. 한우 공란우에서 기존의 과배란 처리 방법에 비해서 발정의 확인없이 CIDR를 삽입 후 과배란 처리 방법이 보다 많은 총회수 난자(6.5 vs. 5.8)와 이식 가능 수정란(3.9 vs.3.2)을 회수하였다(p<0.01). CIDR 처리 한우 공란우에서 성선 자극 호르몬($Antorin^(R)R10$) 용량을 36 mg으로 처리시가 28 mg 처리시 보다 많은 이식 가능 수정란(8.3 vs. 5.4)을 회수하였다(p<0.05). 수정란 이식후 수태율은 수정란의 상태(신선 43.9% vs 동결-융해 23.1%) 및 이식 시술자 (53.9 vs. $0{\sim}16.7%$)가 특히 중요한 영향을 미치는 것으로 나타났다(p<0.01). 본 연구의 결과는 CIDR를 이용한 과배란 처리 방법은 우수한 한우 수정란의 생산에 효과적으로 이용될 수 있음을 보여 주었으며, 수정란의 농가 수란우에 대한 이식은 동결-융해 수정란의 수태율 증진 및 이식 시술자의 기술이 향상될 때보다 효과적으로 이루어질 수 있을 것으로 보인다.