Peer-to-Peer 환경에서의 정보 공유를 위한 인증 메커니즘 구현

이정기,배일호,이철승,문정환,박찬모,이준,Lee, Jeong-Ki,Bae, Il-Ho,Lee, Cheol-Seung,Moon, Jung-Hwan,Park, Chan-Mo,Lee, Joon 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.7

정보사회로 진행되어 감에 따라 컴퓨터 네트워크 사용 및 규모의 증대는 더욱 가속화되어 가고 있다. 또한 컴퓨터 네트워크를 통해서 교환되는 정보의 양의 증가와 함께 네트워크의 보안성이 새로운 문제점으로 부각되고 있다. P2P는 자유로운 네트웍을 구성할 수 있고, 중앙 서버 기능을 없애거나 약화시켜서 각 User간에 참여판 수 있는 개방 네트워크이기 때문에, 각 User간 인증에 관한 문제가 대두되고있다. 네트웍에 있는 어떤 사용자가 공개된 환경에 있다고 가정하면, 각 User간에 허가받은 사용자에게만 접속을 제한하기 위해서는 서비스에 대한 요구를 인증 해야한다. 본 논문에서는 이를 해결하기 위해 P2P 환경에서 보안을 유지하는 방법을 제안하고, P2P 환경에서 안전하게 정보를 공유할 수 있는 메커니즘으로 Kerberos 인증 메커니즘을 인용하여 인증 메커니즘을 설계하였다. According as progress by information society, computer network use and enlargement of scale are accelerated more. Also, with good physician increase of information that is exchanged through computer network, security of network is embossed to controversial point that is new. Because P2P as that remove or weakens center server function is open network that can participate between each user, problem about authentication between each users is risen. If certain user in network i3 in open environment, this user must authenticate request about service to user who is admitted between each user to limit connection. This treatise proposed method to keep security in P2P environment to solve this and designed certification mechanism that quote Kerberos certification mechanism to mechanism that can share information safety in P2P environment.

혼합 체적-경계 적분방정식법을 이용한 응력확대계수 계산

이정기,이형민,Lee, Jung-Ki,Lee, Hyeong-Min 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.7

A recently developed numerical method based on a mixed volume and boundary integral equation method is applied to calculate the accurate stress intensity factors at the crack tips in unbounded isotropic solids in the presence of multiple anisotropic inclusions and cracks subject to external loads. Firstly, it should be noted that this newly developed numerical method does not require the Green's function for anisotropic inclusions to solve this class of problems since only Green's function for the unbounded isotropic matrix is involved in their formulation for the analysis. Secondly, this method takes full advantage of the capabilities developed in FEM and BIEM. In this paper, a detailed analysis of the stress intensity factors are carried out for an unbounded isotropic matrix containing an orthotropic cylindrical inclusion and a crack. The accuracy and effectiveness of the new method are examined through comparison with results obtained from analytical method and volume integral equation method. It is demonstrated that this new method is very accurate and effective for solving plane elastostatic problems in unbounded solids containing anisotropic inclusions and cracks.

Whirling machine의 성능 개선을 위한 연구

이정기,양우석,손재석,한희덕,김한수,Lee Jung-Ki,Yang Woo-suk,Son Jea-seok,Han Hui-duck,Kim Han-soo 대한기계학회 2005 大韓機械學會論文集A Vol.29 No.10

In order to meet the increasing competitive pressures coupled with higher demands for component quality, whirling machines have been at the cutting edge of the automobile industry for more than 25 years. The hard whirling process can save on machining time and operation elimination. Hard whirling is done dry, without coolant. The chips carry away nearly all of the heat during cutting, leaving the workpiece cool and minimizing any thermal geometry variations. The surface finish and profile accuracy are close to grinding quality. Whirling machines usually consist of four major parts; 1) loading system that requires the necessary axial speeds, 2) head stock that needs high precision clamping and positioning system at the chuck and tailstock, 3) whirling unit that demands the high cutting speeds and cutting power fer cutting deep thread profiles and 4) unloading system that requires an easy workpiece unloading. Also, capabilities of the whirling machine can be improved by attaching a vision system to the machine. Most of whirling machines in Korean automobile industry are imported from the Leistritz company, Germany and the Hasegawa company, Japan. Tn this paper, a basic research will be performed to improve and enhance the existing whirling machines. Finally, a new Korean whirling machine will be proposed and developed.

실도로 주행을 반영한 자동차 온실가스 배출 특성 연구

이정기,용기중,김자륭,엄성복,Lee, Jung-Ki,Yong, Geejoong,Kim, Cha-Ryung,Eom, Seong-Bok 한국자동차안전학회 2018 자동차안전학회지 Vol.10 No.3

Greenhouse gas is the big issue of the whole world. So foreign countries, EU, USA, Japan, China and Korea made the policy for reducing greenhouse gas. For calculation of reduction, it is necessary to know the quantity of current greenhouse emission per year in Korea. It is not reflected real driving condition for measuring the Fuel economy and greenhouse gas. The subject of this study is to figure out the characteristics which influence on greenhouse gas in real driving condition. And final goal is applying the policy greenhouse emission reduction.

보조금 부정수급의 법률적 문제와 개선방안

이정기 ( Lee Jung-ki ) 안암법학회 2017 안암 법학 Vol.0 No.53

최근 국가 보조금의 규모가 확대되면서 이와 관련된 사기, 횡령 등의 범죄도 같이 증가하고 있다. 그럼에도 불구하고 국가 보조금과 관련된 여러 부정행위들이 현행법에 의하여 적절하게 통제되지 못하고 있다. 그 이유로는 첫째, 보조금의 관리 및 감독에 관한 체계상의 미비로 인하여 부정수급이 제대로 발견되고 있지 않으며 둘째, 설사 부정수급을 발견하였더라도 그에 대한 처벌이 상대적으로 가볍다는 것이다. 특히 ―전자와 관련하여― 보조금 부정수급이 소위 `숨은 범죄`로 남아 있는 것은, 무엇보다도 수사기관의 단속 및 수사 활동을 통한 범죄통제가 제대로 이루어지지 않는데 있다고 할 수 있다. 한편 ―숨은 범죄의 또 다른 이유로― 보조금 부정수급의 특성상 `직접적`인 피해자가 존재하지 않으므로 그에 대한 범죄가 발생하였다 할지라도 쉽게 적발되지 않는 경우가 많다는 점이다. 왜냐하면 일반적으로 국가 보조금은 처음부터 대가를 바라지 않고 지급하는 것이므로 수급자의 반대급부를 요구하지 않기 때문이다. 더욱이 이처럼 수급자의 반대급부를 요구하지 않기 때문에, (부정) 수급자에게 지급하는 보조금을 (국가의) 재산상 손해라고 파악할 수 있는지에 대한 해석상의 문제점도 발생한다. 이에 필자는 이와 같은 문제의식에서 출발하여, 우선 보조금의 범위 및 부정수급 사례를 살펴보고자 한다. 이로부터 보조금 부정수급과 관련된 가벌성의 범위를 확정짓고, ―사례를 통해― 보조금 범죄를 유형화하고자 한다. 이를 기초로 현행법상 보조금 부정수급에 대한 법적 규제를 검토하고, 그 한계를 도출하고자 하며, 이를 통해 보조금 부정수급에 대한 합리적인 법적·제도적 개선방향을 짚어 보고자 한다. With the expanded scale of the recent crime-prone state subsidies, such as fraud and that amount also surging, but also such irregularities associated with state subsidies it does not have legal adequately controlled. This seems to be because there is disclosed a crime because of a problem on grant management and supervision systems are not carried out properly, revealed the embezzlement, fraud is that such legal for and drafting operational problems being punished relatively lightly with such subsidies . One of the grants another reason for the crime is not easily caught wise to the fact that if there is no direct victim due to the nature of the criminal offense subsidies. In general, national subsidies to the public, nor will also be highlighted because does not require Since tradeoff of beneficiaries that payments do not want a return from the first view, the damage documentation rather than when it is used as a negative supply or extremely personal use a large amount of fine externally, it is not easy even knowing violations. In addition, subsidies are often a criminal offense such as corruption increases even if combined with officers revealed only after officials discovered the crimes that are less well known. Therefore, the premise without being aggressive enforcement and control will be that much difficult to uncover crimes subsidies. Starting from such a critical mind, first seen with respect to the scope and negative supply-demand type of subsidy negative supply, diagnosis and review the legal regulations on existing laws of the subsidy negative supply problems, reasonable legal and institutional improvements for grants negative supply Based on this, want to point out with respect to the direction.

인공신경망을 이용한 수변전설비의 예방보전을 위한 고장 조기 감지시스템에 관한 연구

이정기(Jung-Ki Lee) 한국산업융합학회 2011 한국산업융합학회 논문집 Vol.14 No.3

The modern society longing for the convenience of up-to-date technology, there are attempts of miniaturization and high reliance of power equipments in the effectiveness aspect of urban area’s usage of space while requiring more electrical energy than now. Consequently, paper used to the Neral Network for a forcasting conservation system. A neral network is powerful asta modeling tool that is able to capture and represent complex input/output relationships. The true power and advantage of neral networks lies in their ability to learn these relationships directly from the data being modeled. Traditional linear models are simply inadequate when it comes to modeling data that contains non-linear characteristics. Form results of this study, the Neral Network is will play an important role for insulation diagnosis system of real site GIS and power eqipment using SF? gas.

국제조세에 있어서 이전가격과세제도에 관한 연구

이정기(Lee Jung-Ki) 한국문화산업학회 2006 문화산업연구 Vol.6 No.2

In the recent years international transactions have sharply increased with the launching of WTO and globalization of Korean economy. The inbound investment of foreign multinationals into Korea and at the same time outbound Investment of Korean firms have rapidly increased. As the majority of advanced countries including the USA in the last 20 years has strengthened their sovereign position concerning taxation of foreign firms, Korea also had the strong need to tax multinational firms effectively. In this study we suggest the following reform directions for the transfer pricing taxation system. First, The current limit of fines should be removed to secure the taxpayer's bona-fide obligation to submit evidence materials, as the case of the USA. Second, Even though it is impossible to make an accurate computation of arm's length prices, it is very important for effective transfer pricing taxation. Thus it would be desirable to set and apply the range of arm's length prices. Third, It is necessary to accumulate comparable transactions materials to compute arm's length prices and to instruct transfer pricing experts. In the recent years international transactions have sharply increased with the launching of WTO and globalization of Korean economy. The inbound investment of foreign multinationals into Korea and at the same time outbound Investment of Korean firms have rapidly increased. As the majority of advanced countries including the USA in the last 20 years has strengthened their sovereign position concerning taxation of foreign firms, Korea also had the strong need to tax multinational firms effectively. In this study we suggest the following reform directions for the transfer pricing taxation system. First, The current limit of fines should be removed to secure the taxpayer's bona-fide obligation to submit evidence materials, as the case of the USA. Second, Even though it is impossible to make an accurate computation of arm's length prices, it is very important for effective transfer pricing taxation. Thus it would be desirable to set and apply the range of arm's length prices. Third, It is necessary to accumulate comparable transactions materials to compute arm's length prices and to instruct transfer pricing experts.

체적 적분방정식법을 이용한, 다수의 함유체를 포함한 반무한 고체에서의 탄성해석

이정기(Jung-Ki Lee),구덕영(Duck-Young Ku) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.2

A volume integral equation method (VIEM) is used to calculate the plane elastostatic field in an isotropic elastic half-plane containing multiple isotropic or anisotropic inclusions subject to remote loading. A detailed analysis of stress field at the interface between the matrix and the central inclusion in the first column of square packing is carried out for different values of the distance between the center of the central inclusion in the first column of square packing of inclusions and the traction-free surface boundary in an isotropic elastic half-plane containing multiple isotropic or anisotropic inclusions. The method is shown to be very accurate and effective for investigating the local stresses in an isotropic elastic half-plane containing multiple isotropic or anisotropic inclusions.

중앙경찰학교의 교육적 성과와 발전 방향: 경찰 인력증원 이후를 중심으로

이정기 ( Lee Jung-ki ) 한국경찰학회 2018 한국경찰학회보 Vol.20 No.3

Recently, the demand for public security and high-quality policing has been demanded with the increase of policing demand. At this point, it is important for our police to secure and cultivate new police officers who meet expectations. Following the previous government, the new government has announced policies to secure social safety through the increase of police personnel. In this context, there is a growing debate that one of the ways to enhance and strengthen the effectiveness of various policing activities carried out by police is to strengthen the capacity and expertise of individual police officers. In order to do so, strengthening the capacity of the new police in the pre-entry phase of the actual police activity is the most fundamental first step, and thus the role of the central police school, which is in charge of education for the new police officer, is more important than ever. Education is also directly linked to the development of police organizations. The establishment of an effective police education policy in accordance with the rapid increase of the new police officers has a very important meaning at the time of the 30th anniversary of the establishment of the Central Police School to commemorate last year and the central police school graduates are also closely related with the major achievements I have a relationship. The purpose of this study is to find an effective new police training program according to the reinforcement of the police. When the police return to the previous normal course after the increase of the police personnel, as the curriculum of the time before the increase of the personnel can be considered to be improved in order to apply it to the current situation, the concrete plan of implementation will be presented.

전문서비스 고객이 느끼는 통제력과 서비스 만족에 관한 연구

이정기(Lee, Jung Ki) 한국서비스경영학회 2010 서비스경영학회지 Vol.11 No.5

An increasing number of professional service firms have adopted customer orientation as one of major business objectives. Regardless, many industry reports have indicated that customer satisfaction with professional services is consistently below the average among industries compared. Services literature has maintained that professional services have unique industry characteristics, fostering their customers to easily experience stress, frustration, and dissatisfaction. This study proposes and empirically tests perceived control as a promising variable that enhances satisfaction among customers of professional services. Adopting Averill`s (1973) perspective of personal control, the study conceptualizes perceived control as being composed of three components: cognitive, behavioral, and decisional. Data were collected from customers of medical services. The study found that the medical service customer`s perception of overall control was affected by decisional control, which in turn has a significant influence on overall satisfaction with the services. Implications for managers and researchers are provided.