• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.3
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• pp.187-196
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• 1990

This paper presents the design and implementation of a File Transfer Protocol between PC's which are connected through public network. The file handling system was implemented under 3B20S/UNIX which has connections to IBM-PC under MS-DOS. In designing the Protocol we use Kerimit Protocol which supports a file transfer between several kinds of PC's, and we extended the Kermit Protocol to have window function and file managing system. Users prepare data at PC and are able to send it to host computer and can receive, inquire, and delete file in host computer.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.2
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• pp.269-275
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• 2003

Polysilicon-oxide-nitride-oxide-silicon(SONOS) transistors were fabricated by using 0.35${\mu}{\textrm}{m}$ complementary metal-oxide-semiconductor(CMOS) process technology to realize a low voltage programmable flash memory. The thickness of the tunnel oxide, the nitride, and the blocking oxide were 2.4nm, 4.0nm, and 2.5nm, respectively, and the cell area of the SONOS memory was 1.32$\mu$$m^2$. The SONOS device revealed a maximum memory window of 1.76V with a switching time of 50ms at 10V programming, as a result of the scaling effect of the nitride. In spite of scaling of nitride thickness, memory window of 0.5V was maintained at the end of 10 years, and the endurance level was at least 105 program/erase cycles. Over-erase, which was shown seriously in floating gate device, was not shown in SONOS device.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.11
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• pp.2341-2348
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• 2009

An intrusion detection technique based on host consider system call sequence or system call arguments. These two ways are suitable when system call sequence or order and length of system call arguments are out of order. However, there are two disadvantages which a false positive rate and a false negative rate are high. In this paper we propose the T-N2SCD detection model based on Time Window in order to reduce false positive rate and false negative rate. Data for using this experiment is provided from DARPA. As experimental results, the proposed model showed that the false positive rate and the false negative rate are lowest at an interval of 1000ms than at different intervals.

• Journal of IKEEE
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• v.23 no.4
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• pp.1224-1229
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• 2019

In this study, a liquid crystal (LC) cell was manufactured for smart window applications, such as blinds, and a system for controlling the light transmission rate was developed. The threshold voltage of the LC cell was 1.325 V and when the transmission rate was 10%, the voltage showed 2.370 V, indicating that the LC cell manufactured is driven at low voltage. The LC cell also operated reliably after being heated for 10 min at 80℃. with a response time of less than 30ms. The operation system designed the applied voltage of the LC cell with a interval of about 0.5 V from 0.15 V to 3.53 V and confirmed that the light transmission rate of the LC varies depending on the actual applied voltage. These results suggest that LC cells are likely to be smart window applications.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10d
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• pp.500-504
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• 2007

CPMS(Classroom Power Management System)는 유비쿼터스 센서네트워크 기술을 적용한 층별 강의실 조명 전원을 관리하는 시스템이다. 강의실에는 조도를 센싱하는 모트와 조명 전원을 제어하는 모트가 설치되어 있어, 주기적으로 센서 데이터 및 강의실 전원 상태를 주기적으로 CPMS서버에 보고한다. CPMS 서버는 베이스 모트를 통해 각 강의실의 방의 제어 모트들과 통신하고 전원을 제어하고, 윈도우즈 GUI 소프트웨어를 통해 모트의 상태를 표시하고, 강의실 사용에 대한 스케줄을 입력하여 관리한다. 본 논문에서 CPMS는 모트간의 통신은 IEEE 802.15.4/Zigbee모듈을 사용하여 구현했고 서버소프트웨어는 윈도우즈 시스템을 기반으로 C# 언어와 MS SQL Server로 구현하였다. 본 시스템은 장치들 간의 통신이 모두 무선으로 이루어지므로 설치가 쉽고, 유선 공사에 드는 비용을 절감한 수 있을 뿐 아니라 유선 공사가 난감한 기존 빌딩에서도 구축할 수 있는 장점이 있다.

• The Journal of the Korea Contents Association
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• v.11 no.11
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• pp.19-27
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• 2011

In this paper, we present an emulation library for the essential features and their API function calls provided by Direct3D, the most actively used API for computer game-related application programs on the MS-Windows-based desktop's, with OpenGL library in the Linux environment. In typical Linux-based systems, only the X window system and OpenGL graphics library are available. There are lots of needs for this kind of emulation library to convert the Direct3D-based game applications and user interfaces on these systems. Through carefully selecting the essential API functions from the DirectX version 9.0, we obtained the prototype implementation of that emulation library, to finally get the final full-scale DirectX implementation. Our implementation currently covers 3D coordinate transformations, light and material processing, texture mapping, simple animation features and more. We showed its feasibility through successfully executing a set of Direct3D demonstration programs including a real-world game character animation on our implementation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.643-645
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• 2013

When you convert word processor files with large amounts of input data to PDF files in on/off line, current PDF conversion solutions do one of the source files to perform the conversion task in the Windows PDF virtual printer environment. Depending on the size of the original PDF file conversion speed to convert PDF to do a large amount of different and if you are performing a very slow speed. When you convert files to PDF in this sequence, depending on the capacity of the original file, PDF conversion rate is different, if automating a mass conversion to the PDF, the speed is very slow. In this paper, the PDF conversion which can use the Windows Terminal Server from one Windows Server when performing a PDF conversion processing of the source file, to create a multi-session Terminal, to perform the PDF conversion process at the same time was studied.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.11 s.353
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• pp.149-158
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• 2006

We proposed a method for improving a performance of TCP downstream between a desktop PC as a fixed host and a PDA as a mobile host in a wired and wireless network based on IEEE 802.11x wireless LAN. With data transmission between these heterogeneous terminals a receiving time during downstream is slower than that during upstream by 20% at maximum. The reason is that their congestion window size will be oscillated due to a significantly lower packet processing rate at receiver compared to a packet sending rate at sender. Thus it will cause to increase the number of control packets to negotiate their window size. To mitigate these allergies, we proposed two distinct methods. First, by increasing a buffer size of a PDA at application layer an internal processing speed of a socket receive buffer of TCP becomes faster and then the window size is more stable. However, a file access time in a PDA is kept nearly constant as the buffer size increases. With the buffer size of 32,768bytes the receiving time is faster by 32% than with that of 512bytes. Second, a delay between packets to be transmitted at sender should be given. With an inter-packet delay of 5ms at sender a resulting receiving time is faster by 7% than without such a delay.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.6
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• pp.37-47
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• 2005

Recently, the malicious e-mail worm-viruses have been widely spreaded over the Internet. If the recipient opens the e-mail attachment or an e-mail itself that contains the worm-virus, the worm-virus can be activated and then cause a tremendous damage to the system by propagating itself to everyone on the mailing list in the user's e-mail package. In this paper, we have designed and implemented two methods blocking e-mail worm-viruses. In the fist method, each e-mail is transmitted only by sender activity such as the click of button on a mail client application. In the second one, we insert the two modules into the sender side, where the one module transforms a recipient's address depending on a predefined rule only in time of pushing button and the other converts the address reversely with the former module whenever an e-mail is sent. The lader method also supports a polymorphism model in order to cope with the new types of e-mail worm-virus attacks. The two methods are designed not to work for the e-mail viruses. There is no additional fraction on the receiver's side of the e-mail system. Experimental results show that the proposed methods can screen the e-mail worm-viruses efficiently with a low overhead.

• Journal of Korea Multimedia Society
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• v.24 no.1
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• pp.95-105
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• 2021

In the case of laptops and tablet PC's that replace desktop, it uses the Windows operating system to provide various functions depending on operating system dependency, the Windows operating system does not support real-time processing because it uses multi-level feedback queue scheduling that extends round-robin scheduling. Also, since the initial value of Local APIC Counter can not be obtained from the Windows 8, the real-time processing function provided through the existing RTiK does not work. In this paper, we calculate Local APIC Counter value by using MSR_FSB_FREQ register to support real-time processing function on tablet PC's. We designed and implemented RTiK+, which provides real-time processing function to guarantee the periodicity by calculating the operation time of accurate timer. In order to verify and evaluate the performance of the implemented the RTiK+, the period was measured by using the Read Time-Stamp Counter(RDTSC) instruction and it was confirmed that it operates normally at 1ms and 0.1ms period.