• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.291-292
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• 2014

본 논문에서는 MIPI (Mobile Industry Processor Interface) DSI (Display Serial Interface) 규격을 지원하는 마스터 브릿지 IC의 고속 데이터 전송모드를 구현하였다. MIPI DSI 마스터 브릿지 IC는 RGB 데이터 및 각종 제어 명령어를 디스플레이 모듈 (슬레이브)로 전송하여 디스플레이 모듈을 시험하는 용도로 사용된다. 설계된 마스터 브릿지 IC는 2 라인의 영상 데이터를 저장하는 버퍼, 패킷생성 부분, 패킷을 데이터 레인 (1~4개)에 분배하여 슬레이브로 전송하는 D-PHY 계층 등으로 구성된다. 4가지 bpp (bit per pixel) 형식과 Burst 및 Non-Burst (Sync Events, Sync Pulses 방식)의 세 가지 전송모드를 지원하도록 설계되었다. 설계된 비디오 전송모드가 MIPI DSI 규격에서 정의되는 다양한 동작 파라미터들에 대해 올바로 동작함을 기능검증을 통해 확인하였다.

• KEPCO Journal on Electric Power and Energy
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• 제4권2호
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• pp.67-73
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• 2018

마이크로 그리드 환경에는 변압기, 스위치, 에너지저장장치 등 많은 종류의 전력 설비가 존재하지만, IoT 기술의 발달에 따라 온도, 압력, 습도와 같은 센서 정보를 취득할 수 있는 기회를 제공하고 있다. 기존의 마이크로 그리드 환경에서는 IEC 61850 표준에서 정의하고 있는 MMS 등의 통신 프로토콜을 준용하여 전력 설비와 플랫폼 간 통합 운용되고 있다. 그렇기 때문에 IoT 데이터를 수용하기 위해서는 IEC 61850 기반으로 구성된 데이터 수집 장치(FEP)에 IoT 데이터를 연계해 줄 수 있는 게이트웨이 기술이 필요하다. 본 논문에서는 마이크로그리드 운영 시스템 연계를 위한 IEC 61850기반 IoT 게이트웨이 플랫폼 프로토타입을 제안하고자 한다. 게이트웨이 플랫폼은 IoT 프로토콜(MQTT, CoAP, AMQP) 인터페이스 모듈과 데이터베이스, IEC 61850서버로 구성되어 있다. 데이터베이스의 경우, JSON 데이터를 저장하기 위해 오픈소스 기반의 NoSQL 데이터베이스인 Hbase와 MongoDB를 이용하였다. IoT 프로토콜을 검증하기 위해 라즈베리파이 아두이노 인텔 에디슨 SoC 기반 전력 IoT 디바이스 시뮬레이터를 이용하였고, IEC 61850은 Sisco's MMS EASY Lite를 이용하여 IoT 프로토콜과 IEC 61850 프로토콜간의 상호호환성을 검증하였다.

• 한국인터넷방송통신학회논문지
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• 제19권5호
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• pp.205-210
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• 2019

본 연구는 육가공식품산업 정보화를 추진함에 있어, 육가공식품산업 업무시스템 중 영업관리, 구매자재물류관리, 생산관리 3개의 프로세스를 표준화 시키고 표준 모듈을 개발하며, ERP시스템 개발에서 나타나는 통합적인 업무 기능 설계 표준화에 대하여 연구한다. 본 연구로 정보화 추진정도가 더딘 식품산업과 관련 전문 IT업체에서 생산설비정보 표준화 모듈 도입 비용을 줄이며, 효과는 극대화하고, 연구 표준화가 비교 분석될 수 있는 데이터베이스가 되어 신뢰성을 제공한다. 본 연구 결과를 적용함으로써 식품 원/부재료가 입고하면서부터, 완제품이 되어 소비자에게 출고될 때까지 영업, 구매자재물류, 생산의 효율적인 공정 확립, 품질 향상, 생산비용 절감이 가능하다.

• International journal of advanced smart convergence
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• 제8권2호
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• pp.109-115
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• 2019

Currently, LPWA(Low Power Wide Area) communication technology is widely used due to the development of IoT(Internet of Things) technology. Among the LPWA technologies, LoRaWAN(Long Range Wide Area Network) is widely used in many fields due to its wide coverage, stable communication speed, and low-cost modem module prices. In particular, LoRa(Long Range) can easily construct LoRaWAN with a dedicated gateway. So many organizations are building their own LoRaWAN-based networks. The LoRaWAN Gateway receives the LoRa packet transmitted from an End-device installed in the adjacent location, converts it into the Internet protocol, and sends the packet to the final destination server. Current LoRa Gateway uses a single-hop method, and each gateway must include a communication network capable of the Internet. If it is the mobile communication(i.e., WCDMA, LTE, etc.) network, it is required to pay the internet usage fee which is installed in each gateway. If the LoRa communication is frequent, the user has to spend a lot of money. We propose an idea on how to design a multi-hop protocol which enables packet routing between gateways by analyzing the LoRaWAN communication method implemented in its existing single-hop way in this paper. For this purpose, this paper provides an analysis of the standard specification of LoRaWAN and explains what was considered when such protocol was designed. In this paper, two gateways have been placed based on the functional role so as to make the multi-hop protocol realized: (i) hopping gateway which receives packets from the end-device and forwards them to another gateway; and (ii) main gateway which finally transmits packets forwarded from the hopping gateway to the server via internet. Moreover, taking into account that LoRaWAN is wireless mobile communication, a level-based routing method is also included. If the protocol proposed by this paper is applied to the LoRaWAN network, the monthly internet fee incurred for the gateway will be reduced and the reliability of data transmission will be increased.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.273-275
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• 2009

현대인의 생활은 대부분 실내에서 생활하고 있으며, 실내 거주공간을 쾌적화하기 위한 다양한 시스템을 설계하고 제어하고 있다. 제어기 설계에 있어서 중요한 인자는 온도, 자연광, 실내조명, 공간 넓이 등이 중요한 인자이며 이들 인자들 사이의 상관관계를 규명하여 쾌적제어기를 설계하고 있다. 본 논문에서는 온도, 습도 그 외에 실내 환경에 영향을 주는 조도와 실내 공간 넓이에 대한 기류 센서 등의 센서모듈을 설계하여 실내 환경에 대한 정보를 획득 한 뒤 실내에 사람의 유무에 대한 정보를 기준으로 PMV(Predicted Mean Vote) 규격화를 통하여 실내 환경을 쾌적하게 제어하는 시스템을 설계하였다. 또한, LonWorks 기반의 전력선 통신을 이용하여 실내조명을 제어하며, 공조용 에어컨을 제어할 수 있는 LonWorks 기반의 무선 리모콘을 설계하여 에어컨을 제어하고 원격 모니터링 기능을 수행하는 지능형 제어시스템을 제시하고자 한다.

• 대한건축학회논문집:계획계
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• 제34권11호
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• pp.95-104
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• 2018

Healthcare technology has been growing and fostering cooperation between industry, university and hospitals as growth engines in korea. So, the medibio research institutes in hospital have been constructed to promote research and industrialization centering on healthcare technology. The purpose of this study is to investigate the cases of research institutes in hospitals, and search the characteristics of building organization of medibio research laboratory facilities. Case study is investigated by floor plan, homepage and site visits about five research institutes selected in research-driven hospitals. The facility title and size of research laboratory is originated from site area and research building location. The building function include not only the research lab and business office reflecting on the development platform, and but assembly and meeting room in the ground level. Laboratory floor plans have three types, rectangular, rectangular+linear and linear type, one is traditional and efficient, the others are people and friendly. And building core types are correlated with lab space unit modules, single and double side core are shown in rectangular type. All the laboratories are open lab, composed with laboratory bench and research note writing desk facing the lab service and enclosed lab-support area. And they have communication space looking as warm and cozy common area for the innovation, convergence and collaboration. As the high risk of contamination and high standard for safety and security, equipment and facilities are well managed with biological environment including BSC, fume hood, PCR classification, eye washing and emergency shower.

• 대한건축학회논문집:구조계
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• 제34권1호
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• pp.41-51
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• 2018

In case of evaluating the bond stress of a void deck plate using a wire steel, there is no standard formula considering both the influence on the void and the type of the reinforcing bar. Therefore we proposed a model equation considered the bond characteristics of the void deck plate. A total of 46 specimens was carried out a direct pull-out test and the test variables were the presence of a void body, type of reinforcing bar, the inner cover thickness according to the location of reinforcing bars and bond region. As a result of the comparison between the steel bar and steel wire, the bond stress of the steel wire with the relative rib area of 0.071 is 4.5 ~ 28.58% lower than that of the steel bar with 0.092 and the bond stress reduction rate increases when the inner cover thickness is insufficient. In the case of the inner cover thickness of $1.7d_b$ and $2.7d_b$, the bond stress was reduced to 48.7 ~ 68.4%. In the inner cover thickness was $4.9d_b$ and $5.2d_b$, the bond stresses were equivalent to those of the solid specimens. It was confirmed that the average bond stress and strain were affected by the inner cover thickness. Therefore the predicted model for one module of the void deck plate is proposed and verified by considering the bond characteristics of the void deck plate.

• 정보보호학회논문지
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• 제30권6호
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• pp.1225-1236
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• 2020

퍼징은 예상되는 범위를 벗어난 입력값을 무작위로 생성해 소프트웨어를 동적으로 테스팅 하는 방법으로, 취약점 분석을 자동화하기 위해 주로 쓰인다. 현재 한국인터넷진흥원에서는 국내 표준 암호 알고리즘들에 대한 소스코드를 공개하고 있으며, 많은 암호모듈 개발업체들이 이 소스코드를 이용하여 암호모듈을 개발하고 있다. 만약 이러한 공개 소스코드에 취약점이 존재할 경우, 이를 참고한 암호 라이브러리는 잠재적 취약점을 가지게 되어 향후 막대한 손실을 초래하는 보안 사고로 이어질 수 있다. 이에 본 연구에서는 SEED, HIGHT, ARIA와 같은 블록암호 소스코드의 안전성을 검증하기 위한 적절한 보안 정책을 수립하였고, 차분 퍼징을 이용해 안전성을 검증하였다. 최종적으로 스택 버퍼 오버플로우와 널 포인터 역참조를 포함하는 메모리 버그 항목과 오류 처리 항목에서 총 45개의 취약점을 발견하였으며, 이를 해결할 수 있는 취약점 개선 방안을 제시한다.

• Current Photovoltaic Research
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• 제8권4호
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• pp.114-119
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• 2020

In this study, Mitigation of Potential-induced degradation (PID) for PERC solar cells using SiO2 Structure of ARC layer. The conventional PID test was conducted with a cell-level test based on the IEC-62804 test standard, but a copper PID test device was manufactured to increase the PID detection rate. The accelerated aging test was conducted by maintaining 96 hours with a potential difference of 1000 V at a temperature of 60℃. As a result, the PERC solar cell of SiO2-Free ARC structure decreased 22.11% compared to the initial efficiency, and the PERC solar cell of the Upper-SiO2 ARC structure decreased 30.78% of the initial efficiency and the PID reliability was not good. However, the PERC solar cell with the lower-SiO2 ARC structure reduced only 2.44%, effectively mitigating the degradation of PID. Na+ ions in the cover glass generate PID on the surface of the PERC solar cell. In order to prevent PID, the structure of SiNx and SiO2 thin films of the ARC layer is important. SiO2 thin film must be deposited on bottom of ARC layer and the surface of the PERC solar cell N-type emitter to prevent surface recombination and stacking fault defects of the PERC solar cell and mitigated PID degradation.

• International journal of advanced smart convergence
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• 제10권1호
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• pp.1-11
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• 2021

Document page segmentation is an important step in building a quality optical character recognition module. The study examined already existing work on the topic of page segmentation and focused on the development of a segmentation model that has greater functional significance for application in an organization, as well as broad capabilities for managing the quality of the model. The main problems of document segmentation were highlighted, which include a complex background of intersecting objects. As classes for detection, not only classic text, table and figure were selected, but also additional types, such as signature, logo and table without borders (or with partially missing borders). This made it possible to pose a non-trivial task of detecting non-standard document elements. The authors compared existing neural network architectures for object detection based on published research data. The most suitable architecture was RetinaNet. To ensure the possibility of quality control of the model, a method based on neural network modeling using the RetinaNet architecture is proposed. During the study, several models were built, the quality of which was assessed on the test sample using the Mean average Precision metric. The best result among the constructed algorithms was shown by a model that includes four neural networks: the focus of the first neural network on detecting tables and tables without borders, the second - seals and signatures, the third - pictures and logos, and the fourth - text. As a result of the analysis, it was revealed that the approach based on four neural networks showed the best results in accordance with the objectives of the study on the test sample in the context of most classes of detection. The method proposed in the article can be used to recognize other objects. A promising direction in which the analysis can be continued is the segmentation of tables; the areas of the table that differ in function will act as classes: heading, cell with a name, cell with data, empty cell.