• Journal of Korean Society for Atmospheric Environment
• /
• v.23 no.4
• /
• pp.430-439
• /
• 2007

The objective of this work is the air quality modeling according to the practical roughness length using the building information as surface boundary conditions. As accurate wind and temperature field are required to produce realistic urban air quality modeling, comparative simulations by various roughness length are discussed. The prognostic meteorological fields and air quality field over complex areas of Seoul, Korea are generated by the PSU/NCAR mesoscale model (MM5) and the Third Generation Community Multi-scale Air Quality Modeling System (Models-3/CMAQ), respectively. The simulated $O_3$ concentration on complex terrain and their interactions with the weak synoptic flow had relatively strong effects by the roughness length. A comparison of the three meteorological fields of respective roughness length reveals substantial localized differences in surface temperature and wind folds. Under these conditions, the ascended mixing height and weakened wind speed at night which induced the stable boundary stronger, and the difference of simulated $O_3$ concentration is $2{\sim}6\;ppb$.

• Journal of KIISE:Software and Applications
• /
• v.34 no.9
• /
• pp.797-803
• /
• 2007

Adaptive binarization is very important for the camera-based document recognition. This paper proposes a binarization method which can effectively adapt to the variation of image Qualify. Firstly, it analyzes the effect of binarization parameters to the result and proposes a method to measure the image quality. Then, it statistically analyzes the relationship between the image quality and the binarization parameter. Finally, it proposes a binarization method that automatically adapts to the quality of the input image, using the analysis result. The experiment results show that there is a meaningful relationship between the image quality and the binarization parameter, and therefore, the proposed method can effectively adapt to the variation of image quality.

• The Journal of the Korea Contents Association
• /
• v.6 no.8
• /
• pp.165-174
• /
• 2006

Birdwhistell explains in the whole communication, language conveys only 35% of the meaning and the rest 65% is conveyed by non-linguistic media. Humans do not entirely depend on linguistic communication, but are sensitive being, using every sense of theirs. Human communication, by using facial expression, gesture as well as language, is able to convey more concrete meaning. Especially, facial expression is a many-sided message system, which delivers Individual Personality, interest, information about response and emotional status, and can be said as powerful communication tool. Though being able to be changed according to various expressive techniques and degree and quality of expression, the symbolic sign of facial expression is characterized by generalized qualify. Animation characters, as roles in story, have vitality by emotional expression of which mental world and psychological status can reveal and read naturally on their actions or facial expressions.

• The KIPS Transactions:PartC
• /
• v.13C no.2 s.105
• /
• pp.171-176
• /
• 2006

Bandwidth is an extremely valuable and scarce resource in a wireless network. Therefore, efficient bandwidth management is necessary in order to provide high qualify service to users with different requirements in a multimedia wireless/mobile network. In this paper, we propose an on-line bandwidth reservation algorithm that adjusts bandwidth reservations adaptively based on existing network conditions. The most important contribution of our work is an adaptive algorithm that is able to resolve conflicting performance criteria - bandwidth utilization, call dropping and call blocking probabilities. Our algorithm is quite flexible, is responsive to current traffic conditions in cellular networks, and tries to strike the appropriate performance balance between contradictory requirements for QoS sensitive multimedia services.

• Journal of Korean Society of Rural Planning
• /
• v.10 no.4 s.25
• /
• pp.55-64
• /
• 2004

National Agricultural Pesticide Risk Analysis (NAPRA) WWW 시스템 (http://pasture.ecn.purdue.edu/${\sim}napra$)은 각기 다른 영농방법이 지표수질, 유사, 그리고 지하수질에 미치는 영향을 평가하기 위하여 개발되었다. 이 NAPRA WWW 시스템은 Total Maximum Daily Loads와 같은 수질 요건을 만족시킬 수 있는 최적영농 방법이 무엇인지 찾는데, 그리고 수질측면에서 취약한 지역을 찾아내는데 매우 효율적인 시스템이다. 이 NAPRA WWW 시스템을 이용하여 미국 인디애나주의 수계에 대해서, NAPRA 모의 Nitrogen과 Atrazine 결과를 실측치와 비교하였다. 18개 수계에 대해서 NAPRA 예측 질소값과 실측 질소값을 비교한 결과 $R^2$ 값은 0.51이고, 6개 수계에 대해서 NAPRA 예측 Atrazine값과 실측값을 비교한 결과 $R^2$ 값은 0.87이었다. 이 연구에서 보여지는 바와 같이 NAPRA WWW 시스템은 수계내에서 질소와 Atrazine에 따른 오염지역을 찾아내는데 효율적으로 사용될 수 있는 시스템이다.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.40 no.12
• /
• pp.116-124
• /
• 2003

According to the convenience and efficiency, IEEE 802.11 WLAN(Wireless LAN) has became rapidly wide-spread on the market. However, QoS support is needed for various multimedia service. In this paper, we consider both MAC method of IEEE 802.11 and IEEE 802.11e and Traffic Category differentiated service by QoS support method. In addition, we study currently existing back-off algorithms in view of comparative analysis. As a result we propose a new back-off algorithm called Collision Rate Based-EDCF. The proposed back-off algorithm confirms the performance by computer simulations in terms of Throughput, and QoS support.

• The KIPS Transactions:PartD
• /
• v.10D no.2
• /
• pp.293-300
• /
• 2003

As Internet has grown rapidly and been more complex by technology in connection with Web and requirement of business, qualify and reliability of Web application are getting important. It is necessary to study about testing method along with design technique specially in Web application. This paper explains automation method of user interface test to make test cases about user input form with HTML pages using by built-in browser objects. Examples shows the possibility of testing automation with Javascript objects get mapped. Overhead of writing Javascript can be reduced by making script generator. Generated test scripts are repeatedly used in regression testing Web-based application.

• Journal of the Korean Society for Railway
• /
• v.9 no.6 s.37
• /
• pp.746-752
• /
• 2006

The major objective of this study is to investigate the dynamic behavior evaluation of split PC sleepers for railway turnout by the field test. In railway engineering, a turnout is necessary to allow a vehicle to move from one track to another. So, turnout is required very complex railway technologies such as lolling stock, track. In reference to conventional line speed-up and improvement railway, accurate assembly of turnout affects travel ins qualify of turnout area and running safety. Because of heavy weight and a large volume of the long sleeper used to turnout and car limit, transport and the prerequisite for trouble-free transport of the factory pre-assembled major turnout components is achieved through division of long sleepers. The one of the advantages for using a split sleeper is to reduce the dynamic vibration according to the information of developed nations. Therefore, we investigate the characteristic of dynamic behaviors of split sleepers which are adopted for the first time to improve performance of turnout From the field test results of the split sleeper, it is evaluated that the modification of weight, material and stiffness compared with wood sleeper is very effective for the ballast safety. However, the decrease in vibration of split sleeper was not found out.

• The KIPS Transactions:PartD
• /
• v.12D no.4 s.100
• /
• pp.601-608
• /
• 2005

It is very important to improve qualify, cost and the necessary period for production in software development project. In order to improve software quality, cost and period, final product as well as a project planning and process itself are concerned. In CMMI of SEI and ISO/IEC 15504 (SPICE), the process for the project management is specified. Recently, as a method of total management - including man power, budget, and schedule - PMBOK is introduced. The detailed and specific management method in PMBOK results in multiple experiments that apply PMBOK to enterprise environment. In this paper, hybrid method of CMMI and PMBOK is proposed to obey CMMI, at the same time, to apply the detailed and specific management method in PMBOK and develop metrics for the method.

• The KIPS Transactions:PartD
• /
• v.13D no.2 s.105
• /
• pp.259-270
• /
• 2006

Because a medical embedded software is the software that control the medical devices that are relevant to a human life, it requires high qualify level. It is requires to develop and apply the quality test module that suitable for the requirements to meet the high quality requirements of the medical embedded software. Also, it needs to develop the process that complement the quality defects of software by feedback of the test result. In this study, we developed test module and quality inspection table which can test medical embedded software and produce result based on ISO/IEC 12119.