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작물 에너지를 고려한 온실 동적 시스템 모델링 및 유효성 검증
조정화(Jeonghwa Jo),유상석(Sangseok Yu),이상민(Sangmin Lee),강상규(Sanggyu Kang) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Recently, building energy simulation technique to simulate a model similar to the actual conditions through a variety of dynamic simulation methods, and predict and analyze the flow of energy is being actively introduced and developed. As a fundamental research to apply the BES technique which is mainly used for analysis of general buildings, to a greenhouse, this research designed Venlo type greenhouse using one of the commercial programs, TRNSYS. And field experiments were carried out in multi-span plastic-film greenhouse in Paju. The internal temperature of greenhouse was compared to validate the greenhouse energy model. The temperature of the greenhouse was maintained using an air source heat pump and the effect of the plant growth on the internal thermal environment was considered. The effects on latent heat cooling were calculated by estimating the plants evapotranspiration by Penman-Monteith model. With the aim of developing a model-based method to design greenhouse for a broad range energy supply system and economic condition, we build a model for energy supply system analysis.
노마드적 관점에서 본 전통 정자의 평면구성에 관한 연구
조정화(Jo, Jung hwa),김개천(Kim, Kai chun) 한국실내디자인학회 2010 한국실내디자인학회논문집 Vol.19 No.6
The purpose of this study is to examine how the perception of lives and studies in the Joseon Dynasty period, and the concept of its sculptures can be reflected in Korean traditional pavilion place, from the perspective of Nomadism as a western philosophy of this era. Nomadism literally refers to way of life of peoples who do not live continually in the same place but move cyclically searching for temporary centres whose stability depends on the availability of food and water supply or pastures far their livestock. In recent years, the term encompasses three general types: job nomads, digital nomads and ubi-nomads, which represent distinct features of modern society. Its concept implies looking for the new creative possibility through the liberation of desire and the breakaway to another thinking through continuous formation and transformation. Likewise, Korean traditional pavilion is the architecture to take a quick rest while walking in the mountains. This open place thus connects surroundings with people who are allowed to assimilate with nature as well as train their mind by following the law of nature, in order to finally reach the celestial state of mind. Knowing how to see, enjoy and appreciate the arts very close to nature, our ancestors were able to learn aesthetic activities. After recognizing Korean traditional pavilion as the potential place of unification of heaven and men which is Korean scholar’s lifestyle and outlook on the world, this study accordingly will identify the value and meaning of Korean traditional architecture according to Nomadism in the occidental point of view.
블록체인 기반 탈중앙화 신원증명 환경에서의 계약 플랫폼
조정화(Jung-Hwa Jo),유수빈(Soo-Bin Yoo),유수민(Su-Min Yoo),손애선(Ae-Seon Son) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.12
Recently, with the development of communication technology and the spread of personal devices, transfer contract technology is being applied to various industrial fields such as finance, insurance, real estate, and labor contracts. As interest in the electronic contract platform grows, the market size continues to grow and the central government and enterprises are investing heavily to improve the existing electronic contract platform. However, the contract system is still operated in a centralized structure, and the contracts are forged or altered by malicious users, and the contracts exchanged online have a problem that the validity of the rights cannot be verified. The platform proposed in this paper reinforces security and transparency based on Blockchain, and concludes a contract in a decentralized identity (DID) environment to verify the users qualifications and identity, and We would like to propose a platform that can prevent forgery or falsification of contracts by malicious users by directly managing them.
선박 평형수 처리 장치의 선내 배치를 위한 경제성 평가 연구
김수영,신성철,정보영,조정화,강병윤,Kim, Soo-Young,Shin, Sung-Chul,Chung, Bo-Young,Jo, Jung-Hwa,Kang, Byung-Yoon 대한조선학회 2010 大韓造船學會 論文集 Vol.47 No.2
Various kinds of ballast water treatment systems (BWTS) have been developed corresponding to reinforced IMO rules for marine environment. Some of them got the certificate of IMO and others are waiting for it. Selection of optimum BWTS is very important. Optimum BWTS means not only functional requirements but also economic efficiency. This paper presents economic analysis model for optimum BWTS according to ship type and size. In this study 10 kinds of BWTS whose initial installation cost and maintenance cost are known are analyzed based on present worth method. It is assumed that all BWTS satisfy minimum functional requirements and we need to consider different economical efficiency. Through the economic analysis we could select optimum BWTS.
비밀공유 기법을 적용한 스마트 컨트랙트 플랫폼에 대한 연구
손애선(Ae-Seon Son),유수빈(Soo-Bin Yoo),조정화(Jung-Hwa Jo),유수민(Su-Min Yoo) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.11
Smart Contracts are applied to various automation systems that require reliability because of the fact that integrity and validity of data is verified by recording data in a distributed ledger environment, and the characteristics that are automatically executed when conditions set are satisfied by the written code. One of the areas where smart contracts are used is to sign a contract. However, due to the nature of the distributed ledger environment of the Blockchain, there is a problem that data requiring confidentiality cannot be stored because the data that is transacted is shared with all network participants. This paper aims to make it possible to conclude a reliable contract in the process of writing a contract non-face-to-face by applying a method of storing contract contents in off-chain using a secret sharing technique in a contract platform based on smart contracts.
자기주권 신원증명 기반 스마트 계약 구현을 위한 자격증명 시스템 제안
유수민(Su-Min Yoo),유수빈(Soo-Bin Yoo),조정화(Jung-Hwa Jo),손애선(Ae-Seon Son) 한국정보기술학회 2020 한국정보기술학회논문지 Vol.18 No.12
Modern society has introduced a public key infrastructure that verifies the proof of data senders while ensuring data leakage on the Internet, providing digital certificate technology based on symmetric and asymmetric key encryption for safe data exchange and identity authentication online. But CAof security is fragile, CA of all users using digital certificates are also vulnerable, and also in a data breach. There is a secondary damage that can be caused by information leaked. In order to prevent damage caused by digital certificates and key leaks, this paper proposes a system to ensure the integrity of data by using the distributed ledger environment, the Block chain, and secure the security to exchange the open key safely in a decentralized structure using the open key of the DID (Decentralized Identifier) Document registered in the block chain.