• Journal of Korean Society of Transportation
• /
• v.17 no.2
• /
• pp.137-147
• /
• 1999

This paper studies on the optimal bus network design in the framework of the set covering theory. The theory enables to cover passenger's loading and alighting areas as the set, and maximize the covering set as much as possible. In other words, it calculates the minimal set of the bus routes for covering whole bus passengers demand. After the optimal set of the bus routes is generated by the set covering theory, multimodal traffic equilibrium assignment is used for evaluating the generated set in terms of passenger's mode and route choice behavior. Whilst most previous works on it have been based on analyzing a specific route in a limited area, this study seeks to optimize the whole bus network.

• The KIPS Transactions:PartA
• /
• v.11A no.3
• /
• pp.139-148
• /
• 2004

The number of applications of small embedded systems such as PDAs, electronic note books, etc. based on Kinux, have increased. Due to the monolithic characteristic of Linux kernel, it is not suitable to satisfy the various kinds of embedded application requirement. To assist the shortcoming of monolithic kernel, we implement uJFFS 113th file system as an application program process which runs in user space. This solution consists of a file system and a flash device driver, and makes Linux kernel smaller by separating the file system from the kernel. uJFFS consists of ujffs_fs that plays a part of file system and ujffs_drv that controls a flash device. Which provides the same user interface as Linux does. A Device driver for the physical device is implemented in user pace, which prevents kernel failures from file system errors. So uJFFS can increase stability of the system.

• Journal of Advanced Navigation Technology
• /
• v.20 no.2
• /
• pp.141-147
• /
• 2016

Stable and reliable air traffic service is required for users (aircraft pilot, air traffic controller, airlines and public) through enhancing capability related to airport operation and continuously improving air navigation system. ASMS (air navigation service provider (ANSP) safety maturity survey) is to determine the level of management and safety requirement such as organization, risk, policy, process, training and environment in Air traffic service field. We designed and developed the survey (26 study areas of management part and 23 study areas of safety part) considering global best practices (Eurocontrol and FAA) and customizing domestic circumstances with quantitative level assessment regarding management and safety issue of Air navigation system. The survey enables the performance of Air navigation system to enhance and prevents from occurring accident or incident. Therefore, we provides best information with users as well as high quality Air traffic service.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.37 no.3
• /
• pp.237-243
• /
• 1992

To determine effects of simulated acid rain on the growth and yield of rice, soybean and sesame, and on the soil acidity, two cultivars of rice, soybean and sesame were exposed twice a week to one of four simulated rain acidities[pH 2. 6, 3. 6, 4. 6 and 5. 6(control)]. The plants were protected from ambient rain by a polyethylene film cover. No visible damage due to the simulated acid rain was observed at any stage of growth for either of the crops. In rice, heading date, plant height and yield components except ripening ratio were not significantly affected by the pH ofsimulated rain, but the ripening ratio and rough rice yield linearly decreased as the pH of simulated rain was decreased. In soybean, maturing date and yield components except 100 seed weight were not significantly influenced by the pH of simulated rain, but the 100 seed weight and yield linearly decreased as the pH of simulated rain was decreased. Seed yield and the other agronomic characteristics of sesame were not significantly affected by the pH of simulated rain. Soil pH after cropping rice, soybean and sesame decreased as pH of simulated rain was decreased.

• Journal of Korean Library and Information Science Society
• /
• v.41 no.1
• /
• pp.295-318
• /
• 2010

Recently a reading education system has been developed to manage the accumulated reading activities and past records of individuals under the web environment using computers. And the reading education system, where we can have comprehensive reading education, has been developed and been applied to schools. The reading records in the reading education system can contribute to the improvement of reading activities and reading comprehension, the extension of thinking ability, and the cultivation of insight and character of the readers. The system will provide basic data for reading education for the teachers. The reading education system will accumulate the reading records of individuals. This system is not restricted by time and space. Also the system can support the reading education of children and students effectively. The menu of the reading education system is composed of a test of reading level, reading materials, activities after reading, reading certification, reading record management and instruction of teachers.

• 한국지구물리탐사학회:학술대회논문집
• /
• 2005.05a
• /
• pp.215-220
• /
• 2005

In order to apply to land mine detection effectively, GPR using an optical electric field sensor as a receiver has been developed. The optical electric field sensor is very small and uses optical fiber instead of metallic coaxial cable. With the combination of these advantages and the bistatic radar system, it can be possible for an operator to measure quite flexible and safely. The sensor has been tested in stepped frequency radar system with frequency which consists of a vector network analyzer, a fixed double ridged horn antenna as transmitter. For considering effectiveness in real field, we applied impulse radar system, which consist of a digital oscilloscope and a impulse generator to produce the impulse. Detection of a PMN2 mine model was carried out by the impulse radar system at a sand pit. The PMN2 were detected clearly with sufficiently high resolution, the target contrast was almost the same while the scanning time decreased down to 1/100.

• The KIPS Transactions:PartD
• /
• v.11D no.4
• /
• pp.865-872
• /
• 2004

Web applications have different structural characteristics from conventional applications with the structural language or object-oriented language or 4GL. A web application typically consists of server-side script elements which run on web sewers, client-side script elements which run on the client web-browser, HTML elements that contains context. Therefore web applications developer concurrently uses 3 or more development language. Cyclomatic Complexity for Web Application(CCWA) metrics reflected composite complexity of each element. In this paper, we applied cyclomatic complexity for web application metrics with Complexity level indicator to web application. We applied it to 10 web applications that were developed in practical business. High complexity web applications classify into four type(MENU, FORM, CTRL, GEN). This paper has contributed to practical use of engineering approach for web application.

• The Korean Journal of Financial Management
• /
• v.19 no.2
• /
• pp.1-25
• /
• 2002

본 논문은 한국의 대표적인 두 시장, 코스닥시장과 증권거래소간의 투자전략을 비대칭적 정보가정에서 모형화하고, 정보상의 비대칭요소를 추정하여 최적포트폴리오를 구하는데 목적이 있다. 정보상에 비대칭적 시장들에서는 그 시장에 독특한 위험프리미엄이 존재하게 되는데, 이는 시장간의 효율적 포트폴리오를 구성하는데 있어서 비체계적 위험과 체계적 위험간의 구분이 불분명해지는 상황을 의미하며, 따라서 최적포트폴리오도 보다 복잡한 구조를 갖게 된다. 본 연구는 분석적 차원에서 정보상에 비대칭적인 것으로 가정되는 두 자본시장, 즉 코스닥시장과 증권거래소에서의 최적포트폴리오 전략을 살펴보고, 두 시장간의 비대칭성이 주는 의미와 그것이 최적 투자정책에 미치는 영향의 정도를 분석하고, 비대칭적인 두 시장에서의 균형조건을 살펴본다. 먼저, 최적포트폴리오 전략을 살펴보고, 자산가격 움직임에 있어서 차익거래의 영향을 분석하며 이에 대한 정보상으로 비대칭적인 두 시장간의 포트폴리오 전략과의 관계도 분석하였다. 이어서 비대칭적 상황을 발생시키는 다양한 요소들을 살펴보며 이와 같은 정보비대칭요소가 기대수익수준에 미치는 영향을 분석하기 위해 확률과정의 최적화 방법을 이용하여 추정하였다. 따라서 관련정보를 보유하지 못한 일반투자자들의 경우, 이 추정치를 이용하여 새로운 포트폴리오를 구성하게 될 것이다. 이 또한 불편추정치로서 최적포트폴리오로서의 역할을 하고 있는 것으로 해석된다. 그러나 비대칭요소 추정치의 정확도를 높이기 위해서는 정보를 확보하여야 하며 이에 따라 정보비용도 증가하게 되며 이 또한 최적포트폴리오의 수익성에 영향을 미치게 된다. 따라서 정보비용수준을 포트폴리오의 수익성을 고려하여 결정하여야 하며 이 점에 있어서 본 연구는 어떤 조건하에서 정보비용을 감안한 코스닥시장에의 투자결정이 이루어질 수 있는지를 분석하고 그 기준을 확률적 방법을 이용하여 제시하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.14 no.3
• /
• pp.75-80
• /
• 2014

Transportation culture is an inseparable part of a group's overall culture. Since the term "transportation" is directly related to vehicular movement, I would like to propose the more general term: transportation culture and use that in the following paragraphs. Transportation culture is on one hand expressed by the consumers of transportation services reflecting their overall social culture and on the other hand taken into account by transportation professionals. Ministry of Land and Transportation conducted the Transportation Culture Index, a nationally representative survey, to assess a few key indicators of the degree to which ttransportation culture is valued and is being pursued every year. In this study, recommendation for TCI are explained based on theoretical framework and changing environment.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
• /
• 2000.11a
• /
• pp.42-42
• /
• 2000

패선/구부림 가공은 백판지의 후가공의 일부분으로서 통상적으로 고평량인 백판지를 소비 자에게 맞는 형태로 가공하는 한 공정으로서 접는 공정을 용이하게 하기 위하여 종이 표면 에 패선을 넣어 구부려 접게 되는데 이때 구부리는 면의 표면적의 증가와 내부에서 외부로 향하는 Stress 에 의하여 종이의 표면층이 터지는 현상이 발생하기도 한다.이러한 터짐을 방지하면서 구부립 가공을 하기 위하여 백판지에 요구되는 특성은 여러 가지가 있으며 특히 고평량인 경우에는 종이가 구부러지면서 변형이 크게되는 만큼 외부로 밀리는 힘이 더욱크 게 작용하게 되고 이 힘을 충분히 수용할 수 있는 종이 자체의 강도가 펼요하게 되는데 본 연구에서는 다층판지의 원료특성과 판지특성등이 패션/구부림 가공적성과 연관성을 밝혀내 어 향후 연구방향의 기초를 삼고자 한다. 본 실험에서는 실험실적 결과와 실제 제품에서와의 차이를 최소화 하기 위하여 현장에서 생산되는 백판지를 사용하였으며 백판지의 각층을 구성하는 원료특성과의 상관관계까지 고 려하여 대전공장에서 생산되는 원료의 특성을 분석하고 같은 시간대의 제품과 비교펑가하는 방법을 취하였다. 각각의 원료 특성과 제품특성 (구부러짐 특성) . 공정조건등의 자료를 일정기간 취합하여 S Statisca 를 사용한 통계분석을 하였으며 1차 분석 결과 종이무성에 미치는 영향이 큰 수분 함량과 표면층의 원료구성 (Softwood 함량) 이 일차적으로 영향을 크게 미치며 종이 특성 으로는 CD 방향 터짐과 관련하여 MD 방향 인장, 내절, CD방향 강성등이 상관관계지수 0 0.7 이상으로 비교적 관계가 깊은 것으로 나타나며 인장과 신장율의 곱인 Toughness는 상 대적으로 낮아 터짐 지수로 활용하기는 어려울 것으로 판단되며 또한 신장율도 0.5 수준으 로 나타나며 패선구부러짐에 따른 층간구조변화에 따른 층간결합력이 영향이 있을 것으로 추측은 되었으나 분석결과 0.5 수준인 것으로 나타났다. 또한 CD 방향과 MD 방향의 터짐 성 상관관계도 0.5 이상인 것으로 나타나 섬유배향성도 패선/구부림 가공적성과 관련이 있 는 것으로 나타남으로서 패선/구부림 적성향상은 원료뿐만 아니라 초지공정조건에서도 향상 될 수 있는 것으로 나타났다. 향후 보다 세분화한 분석 및 도공층의 역할이 펼요할 것으로 판단되며 또한 지층구조분석 을 통한 Modeling 도 필요한 것으로 판단된다.