• The Journal of the Convergence on Culture Technology
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• v.10 no.3
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• pp.879-884
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• 2024

Wireless sensor network technology is becoming increasingly important with the advancement of the Fourth Industrial Revolution. Consequently, various protocols such as LEACH, PEGASIS, and EEACP have been developed in an attempt to increase energy efficiency. However, the EEACP protocol still has room for improvement in terms of energy consumption during transmission. Particularly, inefficient paths associated with data reception settings may compromise the network's survivability. The proposed A-EEACP protocol optimizes data transmission direction around the sink node to reduce energy consumption and enhance the network's survivability.

• The Journal of Korean Association of Computer Education
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• v.14 no.6
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• pp.75-81
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• 2011

Cookie is simple text file, which contains records of web service which provided to user. some of data included in Cookie has user's private information. When attacker has Cookie which included user's private information, will causing financial losses. In this paper we designed security section which can improve vulnerable Cookie's security level. Through research and vulnerability analysis of Cookie file, we find out how to implement security area to offer efficient security area and design security area for cookie file. Also we checked security level to performance evaluation. Through this security level, we can keep user's private information secure using Cookie's improve security level which stored in user's personal computer.

• Journal of Technology Innovation
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• v.1 no.1
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• pp.84-99
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• 1993

오래도록 생산성향상곡선 (또는 학습곡선), 생산함수, 그리고 대체곡선 등은, 서로 관련이 없는 별개의, 그리고 순전히 경험적인 (empirical) 현상들인 것들로서 이해되어 왔었다. 그러나 1980년대 중반에 발표된 Muth 교수의 탐색이론 (Search Theory)의 생산성향상곡선에서 관찰된 제반현상들을 모두 설명함으로써 이들 현상은 하나의 통합이론체계에 의하여 일관되게 설명되게 되었다. 이 이론의 초기형태는 그 보편성을 구속하는 네 가지 가설 위에 설립되었었으나 점차적으로 이들 가설들이 완화되면서 (relaxed) 이 이론은 또한 해독 력에서 뿐만 아니라 일반성에 있어서도 계속 강화되어 왔다. 본 논문의 목적은, 이들 네 가지 가설들 중 유일하게 아직 완화되지 못하고 있는, 실제 현상과 다분히 유리된, 두 번째 가설, 즉$\ulcorner$생산성향상을 위한 탐색과정에서 새로이 발견된 개량 신기술 (또는 생산방식) 은 즉각적으로 채택될 것$\lrcorner$이라는 가설을 완화함으로써, 보다 현실에 대한 해석력과 일반성 면에서 개선된 모델을 제시하는 데 있다. 이를 위하여 제시된 모델은 Muth 교수의 탐색이론모델에 두가지 변수를 더함으로써 확장하여 만든 모델이다. 이 두 변수는 신기술의 채택 (또는 획득)을 위하여 지불하여야 하는 투자비변수와 탐색과정을 통하여 발견은 되었으나 아직 채택은 되지 않은, 유보상태 신기술의 운영비용 변수(또는 수익성변수)등이다. 이 모델의 내용은, 생산성향상은 신기술이 구현된 (embodied) 장비 (equipment)를 사용함으로써 실현되며, 따라서 창의적 활동의 이득은 이들 장비에 대한 투자행위로서 실현된다는 것이다. 이 모델은 보다 나은 신기술이 또 발견될 것이라는 기대 하에, 현재 발견된 최신기술을 채택하지 않는 투자지연현상을 예측.설명해 주며 따라서 이로 인한 기술적 비효율성의 존재이유를 제시한다. 또한 이 모델은 생산성 향상곡선의 초기굴곡현상, 정체현상, 그리고 도약현상 등을 모두 설명해 준다.

• Journal of the Korea Society of Computer and Information
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• v.15 no.1
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• pp.1-12
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• 2010

Recently, processor performance has been improved dramatically. Unfortunately, as the process technology scales down, energy consumption in a processor increases significantly whereas the processor performance continues to improve. Moreover, peak temperature in the processor increases dramatically due to the increased power density, resulting in serious thermal problem. For this reason, performance, energy consumption and thermal problem should be considered together when designing up-to-date processors. This paper proposes three modified filter cache schemes to alleviate the thermal problem in the filter cache, which is one of the most energy-efficient design techniques in the hierarchical memory systems : Bypass Filter Cache (BFC), Duplicated Filter Cache (DFC) and Partitioned Filter Cache (PFC). BFC scheme enables the direct access to the L1 cache when the temperature on the filter cache exceeds the threshold, leading to reduced temperature on the filter cache. DFC scheme lowers temperature on the filter cache by appending an additional filter cache to the existing filter cache. The filter cache for PFC scheme is composed of two half-size filter caches to lower the temperature on the filter cache by reducing the access frequency. According to our simulations using Wattch and Hotspot, the proposed partitioned filter cache shows the lowest peak temperature on the filter cache, leading to higher reliability in the processor.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.325-330
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• 2011

A rotor overlap technique was adapted to improve the performance of a axial turbine. The technique secured sufficient flow passage by additional height at the rotor tip and hub. especially in a supersonic turbine, the technique reduced the chance of chocking in the rotor passage, and made to be satisfied the design pressure ratio. However, the technique also made additional losses, like a pumping loss, expansion loss, etc. Therefore, a optimization technique was appled to maximize the improvement of the turbine performance. An approximate optimization method was used for the investigation to secure the computational efficiency. The design variables was shape factors of a rotor overlap. Results indicated that a significant improvement in turbine performance can be achieved through the optimization of the rotor overlap.

• KIISE Transactions on Computing Practices
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• v.20 no.9
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• pp.483-491
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• 2014

Contemporary computer systems exploits DVFS (Dynamic Voltage/Frequency Scaling) technology for balancing performance and power consumption. The efficiency of DVFS depends on how much performance we get for larger power consumption due to elevated CPU frequency. Especially for memory-bounded applications, higher CPU frequency often does not result in higher performance. In this paper, we present an upper bound of CPU frequency scaling based on memory accesses. It is observed that the performance gain due to higher CPU frequency is limited by memory accesses (last level cache misses) per instructions by experiments. Using the results, we present the CPU frequency upper bound with little performance gain. Experimental results show that for a memory-bounded application, applying the frequency upper bound enhances the energy efficiency of the application by above 30%.

• Journal of KIISE:Software and Applications
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• v.31 no.9
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• pp.1180-1195
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• 2004

Due to the exponential increase of information, search and access for the Web information or service takes much time. Web information is represented through several web pages using hyperlinks and each web page is contains several topics. However. most existing web tools don't reflect such web authoring tendencies and treat it as an independent information unit. This inconsistency yields inherent problems in web browsing and searching. In this paper, we propose a web surfing assistant called LinkBroker that provides collodion pages. They are composed of relevant information extracted from several web pages that have table and frame structure in order to improve accessibility to web information. Especially, the system extracts a set of web pages that are logically connected and groups those pages using table and frame tags. Then, essential information blocks in each page of a group are extracted to construct an integrated summary page. It Provides a comprehensive view to user and one cut way to access distributed information. Experimental results show the effectiveness and usefulness of LinkBroker system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.6
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• pp.1443-1453
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• 1998

This paper presents the speech synthesis engine that converts the character strings kept in a computer memory into the synthesized speech sounds with enhancing the intelligibility and the naturalness by adapting the waveform processing method. The speech engine using demisyllable speech segments receives command streams for pitch modification, duration and energy control. The command based engine isolates the high level processing of text normalization, letter-to-sound and the lexical analysis and the low level processing of signal filtering and pitch processing. The TTS(Text-to-Speech) system implemented by using the speech synthesis engine has three independent object modules of the Text-Normalizer, the Commander and the said Speech Synthesis Engine those of which are easily replaced by other compatible modules. The architecture separating the high level and the low level processing has the advantage of the expandibility and the portability because of the mix-and-match nature.

• Journal of Internet Computing and Services
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• v.24 no.4
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• pp.93-105
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• 2023

In order to transform the traditional aquaculture industry, which is dependent on experience, labor-intensive and natural environment, into future intelligent smart aquaculture, digital aquaculture improves aquaculture reproducibility and efficiency of production process through digitization of the aquaculture industry based on ICT equipments, Data analysis and utilization for promoted to increase the acceptability of aquaculturist. Europe's advanced fisheries countries have achieved rapid growth not only in aquaculture technology but also in the aquaculture equipment industry through digitization that combines information and communication technology with aquaculture farms. However, it is not possible to collect aquacultural data in Korea because it has not secured a Korean aquaculture industry for multi-variety, small-scale production and aquaculturists' refusal of reception for digital transformation. Therefore, this study intends to suggest the development direction of digital aquaculture to convert to intelligent smart aquaculture in the future by analyzing trends and critical technology.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.247-247
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• 2021

국내외적으로 하도 내의 흐름을 해석하기 위해 다양한 2차원 흐름해석 모형이 적용되고 있다. 2차원 흐름해석 모형은 기존의 1차원 흐름 해석 모형에서 해석하기 어려운 확산형 홍수파 해석에 강점을 가지고 있어 도심 하천의 외수 범람 예측 등에도 사용되고 있다. 하지만 복잡한 지형 형상을 어떻게 격자로 구성하는가에 따라 해석의 효율성과 정확성이 크게 좌우된다. 초기의 2차원 흐름해석 모형은 주로 정형격자 기반의 단순한 셀을 제작하여 구동되었다. 하지만 매우 빠른 유속과 복잡한 형상을 반영하기 위해서는 전체 격자를 조밀하게 구성할 필요가 있으므로 계산 효율이 떨어지는 문제점이 있다. 그렇기 때문에 대안으로 삼각망과 혼합망 등 비정형 격자를 사용하여 필요한 구역만 격자를 조밀하게 구성하는 방법을 사용하고 있지만 이 방법 또한 추가적인 계산 과정에 따른 계산 시간의 증가가 필연적이다. 따라서 최근에는 정형격자와 비정형격자에 대하여 wet-dry front matrix 최적화, 절점제거법 등 다양한 기법을 통하여 계산 효율을 향상시키고 있는 실정이다. 따라서 본 연구에서는 HLLC Rimann solver와 2차 정확도 기법인 MUSCL-Hancock Method를 적용한 유한체적기반 천수방정식을 기반으로 다양한 격자 구성에 따른 2차원 흐름해석 모형의 효율성 분석을 수행하고, 이를 통해 최적의 흐름해석 방안을 제시하고자 한다.