• Journal of the Korea Society of Computer and Information
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• v.23 no.9
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• pp.73-80
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• 2018

In this paper, we propose a new type of client server environment to improve the architecture vulnerable to hacking in an existing client server environment. On the server side, move the existing Web server to the client side and This is a way for clients to communicate only the data they need and suggests a structure that completely blocks the web attack itself to the server. This can completely prevent a server from being hacked, spreading malicious code and hacking data on a server. It also presents a new paradigm that will not affect servers even if malware is infected with client PCs. This paper validates the proposed environment through BBS (Big Bad Stick) hardware in the form of USB on the client side. This study proof that secure services are provided through encryption communication with server-side security equipment, indicating that this study is a system with new security.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.527-529
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• 2021

This paper focuses on the implementation of machine learning model for Recycling bot, which is a platform service of recycling education. The recycling bot applied with a AI model using collected image set. The experiment confirms that classified by the model result are accurate.

• Journal of the Korea Society of Computer and Information
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• v.25 no.4
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• pp.87-95
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• 2020

In this paper, we examine the problems of the current Internet due to the development of network services and the expansion of network bandwidth. The current Internet has been used for a long time because it is composed of TCP / IP, but fundamental problems such as bandwidth, transmission rate, and security have not been solved. Therefore, the future network must be prepared through continuous investment and maintenance. In order to overcome this problem, we will propose a way to overcome the above problems and upgrade by converting the current Internet Protocol into the next generation network. Currently, many researches on next-generation networks have been conducted, but there are not many studies in Korea, and research on next-generation networks will be a very important task for the future development of the Internet service industry at the national level. In this paper, we propose an advanced internet environment through the advantages of various next generation protocols.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.1290-1293
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• 2021

Currently, blind people are experiencing a lot of inconvenience in their daily lives. In order to provide helpful service for the visually impaired, this study was carried out to make a new smart glasses that transmit information monitoring walking environment in real-time object recognition. In terms of object recognition, YOLOv4 was used as the artificial intelligence model. The objects, that should be identified during walking of the visually impaired, were selected, and the learning data was populated from them and re-learning of YOLOv4 was performed. As a result, the accuracy was average of 68% for all objects, but for essential objects (Person, Bus, Car, Traffic_light, Bicycle, Motorcycle) was measured to be 84%. In the future, it is necessary to secure the learning data in more various ways and conduct CNN learning with various parameters using darkflow rather than YOLOv4 to perform comparisons in the various ways.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.281-282
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• 2016

본 논문에서는 IoT 디바이스를 안전하게 관리하고 인가되지 않은 접근과 같은 위협에 대응할 수 있는 보안 메커니즘을 제안한다. 이 메커니즘은 IoT 디바이스의 시스템 특징 및 네트워크 특징을 조합하여 개별적인 시그니처를 생성하고 이를 네트워크에서 지속적이고 주기적으로 검사를 수행함으로써 허가되지 않은 디바이스의 접근을 근본적으로 차단하는 방안이다. 본 논문에서는 제안한 메커니즘을 확인하기 위해 실험망을 구성하여 정상 IoT 디바이스와 비정상 IoT 디바이스를 정책적으로 구별하여 차단하여 보안 메커니즘의 우수함을 보인다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.4
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• pp.52-57
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• 2020

The frequency of the manufacturing and modification of automotive press dies via overlay welding has recently increased, but the welding quality depends on the operator skills and the working conditions. Therefore, this study presents a way to improve the overlay welding quality regardless of the operator skills. Three welding conditions with different pre- and post-heating treatments were tested on some specimens; the weld surface quality was analyzed by examining the cutting face. The results demonstrated the best quality of the weld surface that was heated before and after the welding.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.3
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• pp.71-76
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• 2020

Various machining methods are being studied to improve the processing quality of the spherical R shape in press die. In this paper, we confirmed that changes in machining quality were associated with changes in cutting direction, path, and cutting angle, which are commonly used in the machining of molds. We obtained a surface roughness graph with each condition change in one specimen using an instrument that measured geometry and surface roughness simultaneously. The results of the study showed that the best surface roughness in the finish cut of the spherical surface was obtained using upward pick feed machining.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.12
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• pp.100-106
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• 2021

This paper presents a study on the improvement of the machining quality of sculptured-surfaces of molds according to the shape and posture of the tool. In the existing 3-axis machining, the methods using the ball end-mill and radius end-mill were analyzed for various cutting patterns and compared with those of the 5-axis machining. It was observed that the 5-axis machining using a ball end-mill obtained the finest surface roughness, and for the 3-axis machining, the optimal results were obtained for the one-way machining using a radius end-mill.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.11
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• pp.30-35
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• 2021

In this study, a machine simulation system was built using the actual scale of an AC-type 5-axis machine tool for mold surface machining that can be used in applications, such as, modeling and machine building, stroke, and collision detection. The validity of the 5-axis machine simulation system was verified by performing tool path generation, post-processing, machine simulation, prototype motion simulation, and an actual cutting experiment. This entire process was intended to activate the 5-axis machining in mold surface machining.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.679-680
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• 2021

본 논문에서는 개인용 하드웨어를 통해 인증을 강화하고 이를 활용하여 개인 클라우드를 제공할 수 있는 개인용 보안장비인 DONO를 제안한다. 또한 DONO를 활용하여 보다 규모가 확장된 클라우드 서비스를 제안하고 이를 활용하여 실제 서비스가 가능함을 보여주도록 한다. DONO가 사용하는 환경은 기존의 네트워크 시스템을 따르는 대신 콘텐츠 중심의 통신을 통해 면역 기반 보안 시스템을 구축한다. 데이터 전송은 CCN(Content Centric Network)을 통해 이루어지며 CCNx 그룹이 검증한 프로토콜을 활용한다. DONO에 의해 보호되는 영역은 일반적인 네트워크 통신을 사용하지 않고 CCN 프로토콜에 따라서 운영하며 이를 통해 기존의 보안 공격과 추가적으로 알 수 없는 공격으로부터 시스템을 보호할 수 있다. 이러한 새로운 방식을 활용해 클라우드 시스템을 제공하며 보다 안전한 서비스를 활용할 수 있음을 보이도록 한다.