17-4析出硬化型 stainless steel에서의 Cu析出의 硏究 : 17-4석출경화형 stainless steel에서의 Cu석출의 연구

김영국 釜山大學校 工科大學 1983 工科大學 硏究 報告 Vol.26 No.-

인도네시아 村落共同體에 對한 考察

金泳國 亞洲大學校 1976 論文集 Vol.1 No.-

The purpose of the present paper is to examine the nature of the Indonesian community by employing the socio-economic approach. The examination is based on a critical evaluation of Boeke's concept and analysis of the Indonesian community. It has been pointed out in the paper that the traditional system does not function as a leading factor in checking the modernization of this particular community, although it is one of the various factors affecting it adversely. It is also emphasized that for a rapid transformation into the capitalistic system it is not only necessary to apply the pure economic approach, but it is also imperative to cast off the backwardness of the people and adapt them to the new system.

MEASUREMENT OF THE DISC-PAD FRICTION COEFFICIENT FOR MECHANICAL BRAKES USING DIRECT AND INDIRECT METHODS

김영국,김석원,박찬경,박태원,김영모 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.1

It is necessary to guarantee the proper brake force to stop a train safely in a limited distance and o adjust its speed. Currently, most trains are run by electrical power and have a combined electrical and mechanical (friction) braking system. The mechanical brake force is determined by many parameters, such as the friction coefficient of the brake disc and pad, the pressure in the brake cylinder, the brake cylinder’s cross sectional area and the brake linkage ratio. In general, the friction coefficient data of the brake disc and pad have been taken through a dynamo-test in a laboratory, but these data might not be well matched with real data under operating conditions because of the difference in data acquisition conditions. The present study examined two methodologies that can measure the friction coefficient of the brake pad and disc based on a train’s real operating conditions. The first method was the direct method, which measured the brake force and clamping force applied on the mechanical brake by using strain gauges installed on the brake to calculate the friction coefficient. The second was an indirect method that obtained the friction coefficient by using the weight of the train and the equivalent brake force. Those variables were calculated from the longitudinal dynamic characteristics, such as resistance to motion, gradient resistance and curved resistance. These two methodologies were used to obtain the disc-pad friction coefficient for the mechanical brakes of a Korean high-speed train (HSR350x).

실측 기압과 고정밀 GNSS 자료처리 ZWD 추정값을 기반으로 하는 대류권 지연 추정 모델 개발

김영국,김혜인,박관동 한국측량학회 2023 한국측량학회지 Vol.41 No.5

This research represents a method that separates tropospheric delay into hydrostatic delay and wet delay, to derive a tropospheric model which can be utilized as a Tropospheric Delay Estimation Model. Hydrostatic delay can be calculated through various empirical models using only atmospheric pressure data. Thus, the KP (Korea Pressure) model, an atmospheric pressure estimation model, was developed based on the observed atmospheric pressure data from GNSS (Global Navigation Satellite System) stations in South Korea. Results show that the average RMSE (Root Mean Square Error) of the GPT (Global Pressure and Temperature) model, based on global data, and the KP model are 6.5 hPa and 4.8 hPa, respectively. This indicates that the KP model better reflects the observed pressure in South Korea. KZWD (Korea ZWD) model, a wet delay estimation model, was developed based on the ZWD (Zenith Wet Delay) calculated using the total tropospheric delay data. This data was computed from the observed atmospheric pressure and the GIPSY-OASIS, a high-precision GNSS data processing software. The average RMSE of the KZWD model, based on the calculated ZWD, was 5.5 cm.

接尾辭/-?-/의 形態考 - /-와ㄷ-/의 形態的 分類를 中心으로

김영국 경기대학교인문대학국어국문학회 1980 京畿語文學 Vol.1 No.-

外食 체인 企業의 서비스 經營시스템에 관한 硏究

金榮國 東國大學校 嶺南地域發展硏究所 1996 地域發展硏究 Vol.2 No.1

대학신문의 통일논의 분석

김영국 전남대학교 글로벌디아스포라연구소 2001 전남대학교 세계한상문화연구단 국내학술회의 Vol.2001 No.5

플랫폼 노동자의 고용안정성과 삶의 질 (Quality of Life: QoL)에 대한 탐색적 연구

김영국,이수연,우은주 (사)한국관광레저학회 2022 관광레저연구 Vol.34 No.7

The purpose of this study is to explore the relationship between platform workers' work-life balance (WLB) and quality of life (QoL); to examine the working environment, work-life balance perception of platform workers, and to suggest improvements in job stability and quality of life of platform workers. To achieve the aim, the study was to inspect the psychological circumstances and attitudes towards life and work of platform workers related to the work environment and work-life balance through in-depth interviews. Based on interviews with 10 platform workers, the study consisted of working hours, working environment, income level, safety environment, platform, psychological state, and social perception in subcategories of work based on work and life that affect work-life balance. Subcategories were composed of holidays, leisure time, health/psychological status, and subjective satisfaction. The major theoretical and practical implications were discussed, and the limitations and comments for future research were suggested.

마스크를 착용한 얼굴 인식을 위한 방법 연구

김영국,임채현,손민지,김명호 한국IT정책경영학회 2020 한국IT정책경영학회 논문지 Vol.12 No.4

Recently, face recognition with occlusions has a problem in that the recognition rate is decreased. This paper proposes a method of matching two faces with high similarity by measuring the similarity by a distance after making an image with a mosaic on the lower part of the face to increase the recognition rate of a face wearing a mask. The proposed method shows a similar recognition rate as when the mask is not worn, and in the group of 100 people, the mask shows 12% improvement in Rank-1 and 18.8% improvement in matching accuracy.

가상자산(암호화폐)의 범죄위협 요인 분석과 금융산업 안정화 방안 모색

김영국 한국지급결제학회 2023 지급결제학회지 Vol.15 No.2

The reliability of the exchange determines the security of crypto assets. Past hacking incidents show that there is a risk of price manipulation by hacking and a risk of forced closure of business offices. Additionally, members’ passwords and personal information were lost, and a large amount of Bitcoin (BTC) was lost. There is always a risk that an exchange, whether domestic or international, will be hacked. However, it is often the exchange, not the cryptocurrency itself, that suffers damage from these hacking attacks, and even if damage occurs due to hacking, the risk can be said to be suppressed to some extent as long as the damage is compensated. Security measures are not only necessary for crypto assets. In addition to exchange hacks and cryptocurrency leaks, cash and credit cards are also at risk of fraud and theft. The war on property crime has been repeated many times throughout history. Even without cryptocurrency, it would be more important to make efforts to improve security awareness. So what about the security of the cryptocurrency itself? First of all, we would like to point out that we have adopted a very transparent blockchain system. Many cryptocurrencies work together using a technology called “blockchain”. Blockchain is data that records transactions of cryptographic assets. In fact, so far, exchanges have been hacked and Bitcoin (BTC) has been stolen, but the Bitcoin (BTC) blockchain situation has never been manipulated. The Bitcoin (BTC) blockchain itself is highly transparent and resistant to tampering. Additionally, Ethereum (ETH) smart contracts use the characteristics of the blockchain to link records such as contract terms and various documents to payments. The functionality of this smart contract is also very secure. That is why many blockchain-based projects are underway. In fact, the development of several blockchain-based systems, such as real estate registration and medical data, has already been realized. As you can see, the security of the crypto asset itself is very solid. Next, I would like to point out crypto assets whose trustworthiness is questionable. Although the mechanism of crypto assets itself is very secure, it is also true that there are companies that try to abuse it. For example, the authenticity of some coins issued in new ICOs (proprietary cryptocurrencies issued for fundraising purposes) is questionable. Projects that are heavily advertised and have slow development are sometimes talked about as icons for raising funds. Some of the small cryptocurrency assets handled by overseas exchanges are malicious. It is dangerous to get caught up in a story that is too good to be true or to swallow information from unknown sources. A little carelessness can increase the risk of fraud and theft of funds. This does not mean that cryptocurrency assets are risky, but that the groups associated with cryptocurrency assets are risky. Crypto assets themselves are a technology that is expected to continue to expand in the future. That is why the dissemination of correct knowledge, laws and regulations is very important. 거래소의 신뢰성은 암호화 자산의 보안을 결정한다. 과거 해킹 사건을 통해 해킹에 의한 가격조작의 위험과 영업소의 강제폐쇄 위험이 있음을 알 수 있다. 또한 회원의 비밀번호와 개인정보가 손실되고 많은 양의 비트코인(BTC)이 손실되었다. 국내든 국제든 거래소가 해킹당할 위험은 항상 존재한다. 그러나 이러한 해킹 공격으로 피해를 입는 것은 암호화폐 자체가 아니라 거래소인 경우가 많으며, 해킹으로 인한 피해가 발생하더라도 피해를 보상하는 한 어느 정도 위험은 억제된다고 할 수 있다. 보안조치는 암호화 자산에만 필요한 것이 아니다. 거래소 해킹 및 암호화폐 유출 외에도 현금 및 신용카드도 사기 및 도난의 위험에 처해 있다. 자산을 대상으로 하는 범죄와의 전쟁은 역사를 통틀어 여러 번 반복되었다. 암호화폐가 없더라도 보안인식을 개선하기 위해 노력하는 것이 더 중요할 것이다. 그렇다면 암호화폐 자체의 보안은 어떨까? 우선 매우 투명한 블록체인 시스템을 채택했다는 점을 지적하고자 한다. 많은 암호화폐는 “블록체인”이라는 기술을 사용하여 함께 작동한다. 블록체인은 암호화 자산의 거래를 기록하는 데이터이다. 실제로 지금까지 거래소가 해킹당하고 비트코인(BTC)이 도난당했지만 비트코인(BTC) 블록체인 상황은 조작된 적이 없다. 비트코인(BTC) 블록체인 자체는 매우 투명하고 변조에 강하다. 또한 이더리움(ETH) 스마트 컨트랙트는 이 블록체인의 특성을 이용하여 계약 조건 및 각종 문서와 같은 기록을 결제에 연결한다. 이 스마트 계약의 기능도 매우 안전하다. 그렇기 때문에 많은 블록체인 기반 프로젝트가 진행되고 있다. 실제로 부동산 등록 및 의료 데이터와 같은 여러 블록체인 기반 시스템 개발이 이미 실현되었다. 보시다시피 암호화 자산 자체의 보안은 매우 견고하다. 다음은 신뢰가 의심스러운 암호화 자산을 지적하고자 한다. 암호화 자산의 메커니즘 자체는 매우 안전하지만 이를 악용하려는 회사가 있는 것도 사실이다. 예를 들어, 새로운 ICO(자금조달 목적으로 발행된 독점 암호화폐)에서 발행된 일부 코인은 진위 여부가 의심스럽다. 자금조달을 위한 아이콘으로 대대적으로 광고하고 개발이 느린 프로젝트가 때때로 회자된다. 해외 거래소에서 취급하는 소액 암호화폐 자산 중 일부는 악성이다. 사실이라고 하기에는 너무 좋은 이야기에 휘말리거나 출처를 알 수 없는 정보를 삼키는 것은 위험하다. 약간의 부주의는 사기 및 자금 도난의 위험을 증가시킬 수 있다. 암호화폐 자산이 위험하다는 것이 아니라 암호화폐 자산과 관련된 그룹에 위험이 있다는 것이다. 암호화 자산 자체는 앞으로도 계속 확장될 것으로 예상되는 기술이다. 그렇기 때문에 올바른 지식과 법률 및 규정의 보급이 매우 중요하다.