• 한국산업정보학회논문지
• /
• 제4권1호
• /
• pp.1-6
• /
• 1999

이 논문은 실시간 소프트웨어의 요구 분석을 위한 구조이다. 이 방법은 실제 사용자들과의 쉬운 통신 수단으로 TNPN(Timed Numerical Petri Net)을 사용하는데, 시스템의 정확성을 위해서 RT시(Real Time Temporal Logic)에 기초한다. TNPT은 행위 명세언어로서 사용되며, 그 행위의 정당성은 RTTL로 표현되는데, 도달성 그래프를 통해 분석되었다. 그래서 사용자와 시스템의 두가지 요구사항이 모두 만족된다. 공유트랙 시스템의 예를 통하여 실시간의 성질(안전성, 응답성, 생존성, 우선순위)들이 검증되었다. 또한 이 구조는 자연스럽게 객체와 연결된다.

• 정보처리학회논문지:소프트웨어 및 데이터공학
• /
• 제1권2호
• /
• pp.81-90
• /
• 2012

공개소프트웨어는 많은 분야에 걸쳐 활용률이 점차 높아지고 있으며, LMS 분야에서도 공개소프트웨어의 활용이 점차 늘고 있다. 단, 공개소프트웨어 LMS를 도입하려면, 기관별 특화 요구사항에 맞추어 연동 과정이 필수적이다. 본 연구에서는 공개소프트웨어 LMS인 무들을 학교에 도입함에 있어 무들과 학사 시스템 간의 사용자 관리와 강좌 관리를 위한 연동 지원 도구를 구현하였고, 무들과 학사 시스템과의 연동 사례를 통해 사용자 및 강좌 정보 연동을 효율적으로 수행하였다.

• Journal of Biosystems Engineering
• /
• 제36권4호
• /
• pp.243-251
• /
• 2011

Purpose of this study was to analyze power requirement of an agricultural tractor for baler operation. First, a power measurement system was developed and installed in a 75 kW agricultural tractor. Strain-gages with a telemetry system were used to measure torques of transmission and PTO input shafts. An engine tachometer was used to measure rotational speed of transmission and PTO input shafts. The measurement system also included pressure sensors to measure pressure of hydraulic pumps, an I/O interface to acquire the sensor signals, and an embedded system to determine power requirements. Second, field experiments were conducted at two PTO speed levels, and proportion of utilization ratio of rated engine power and power consumption of major parts (transmission input shaft, PTO input shaft, main hydraulic pump, and auxiliary hydraulic pump) were analyzed. Results of usage proportion of engine power for PTO speed level 1 and 2 were 4.1 and 2.2%, 31.5 and 16.3%, 49.6 and 59.7%, 14.4 and 20.8%, and 0.4 and 1.0%, respectively, for ratio of measured engine power to rated engine power of less than 25%, 25 ~ 50%, 50 ~ 75%, 75 ~ 100%, and greater than 100%. The results showed that the usage proportion increased in the range with the ratio of power requirement to rated engine power of over than 50% when the PTO gear was shifted from P1 to P2. Averaged engine power requirement for baling operation, tying and discharging operation, and total operation were 43.3, 37.3, and 42.0 kW and 49.0, 37.0, and 47.4 kW, respectively, for PTO speed level 1 and 2. Paired t-test showed significant difference in power consumption of engine, transmission input shaft, and PTO input shaft for different PTO speed levels. Therefore, the power consumption of engine for baler operation increased when the PTO gear was shifted from P1 to P2. It was indicated that the power requirement of tractor was affected by the PTO rotational speed for baler operation.

• 한국정보과학회논문지:소프트웨어및응용
• /
• 제33권7호
• /
• pp.615-623
• /
• 2006

비기능적 요구사항은 대상 시스템이 지원해야 할 기능적 요구사항의 속성 또는 품질 요구사항을 말하며, 소프트웨어의 품질 속성으로 반영된다. 이러한 비기능적 요구사항은 특히 성능과 관계된 부분의 설계를 결정하기 위한 중요한 기준으로 사용된다. 따라서 비기능적 요구사항은 소프트웨어 개발 생명주기 전반에 걸쳐 계속적으로 고려되고, 관리되어야 한다. 하지만 비기능적 요구사항의 모호성과 비가시적 특성으로 인해 도출 및 명세뿐만 아니라, 관리에도 어려움이 많다. 이에 본 논문에서는 NFR 그래프를 이용해 비기능적 요구사항에 가시성을 부여하고 비기능적 요구사항을 설계에 반영하여 비기능적 요구사항 관리의 효율성을 높이기 위한 비기능적 요구사항의 추적 기법을 제안한다. 비기능적 요구사항 개발 절차에 따라 지능형 조명 제어 시스템의 성능 요구사항 추적 방법을 사례연구로 수행하였으며, 이를 통해 종합적으로 비기능적 요구사항 관리의 효율을 높이고자 한다.

• ETRI Journal
• /
• 제26권6호
• /
• pp.615-621
• /
• 2004

Next generation mobile communication system, such as IMT-2000, adopts Turbo codes due to their powerful error correction capability. This paper presents a block-wise maximum a posteriori (MAP) Turbo decoding structure with a low memory requirement. During this research, it has been observed that the training size and block size determine the amount of required memory and bit-error rate (BER) performance of the block-wise MAP decoder, and that comparable BER performance can be obtained with much shorter blocks when the training size is sufficient. Based on this observation, a new decoding structure is proposed and presented in this paper. The proposed block-wise decoder employs a decoding scheme for reducing the memory requirement by setting the training size to be N times the block size. The memory requirement for storing the branch and state metrics can be reduced 30% to 45%, and synthesis results show that the overall memory area can be reduced by 5.27% to 7.29%, when compared to previous MAP decoders. The decoder throughput can be maintained in the proposed scheme without degrading the BER performance.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제14권4호
• /
• pp.407-418
• /
• 2014

As the high-throughput requirement in the next generation communication system increases, it becomes essential to implement high-throughput SISO (Soft-Input Soft-Output) decoder with minimal hardware resources. In this paper, we present the comparison results between cascaded radix-4 ACS (Add-Compare-Select) and LUT (Look-Up Table)-based radix-4 ACS in terms of delay, area, and power consumption. The hardware overhead incurred from the retiming technique used for high speed radix-4 ACS operation is also analyzed. According to the various analysis results, high-throughput radix-4 SISO decoding architecture based on simple path metric recovery circuit is proposed to minimize the hardware resources. The proposed architecture is implemented in 65 nm CMOS process and memory requirement and power consumption can be reduced up to 78% and 32%, respectively, while achieving high-throughput requirement.

• 한국생산제조학회지
• /
• 제19권4호
• /
• pp.440-448
• /
• 2010

Recently, there are many corporations, schools and institutes that apply TRIZ to solve technical problems. However, in reality, only a few cases of brainstorming applications exist in utilizing forty principles of TRIZ due to the difficulty at TRIZ problem definition. In order to facilitate TRIZ applications, this study proposes the utilization of requirement definition and description tool of systems engineering in TRIZ problem definition. No requirement definition exists in general problem types that TRIZ approach is used in implementing system solution. At most of problem situations, TRIZ users reversely infer that certain problem belongs to which requirement definition it is and recommends TRIZ tools to be used for the exact problem definition. This study also proposes TRIZ problem definition method by applying the results of requirement definition process. The application of TRIZ is demonstrated to the general situation with no problem definition where the proposed method enables the proper use of TRIZ.

• 한국IT서비스학회지
• /
• 제8권1호
• /
• pp.113-124
• /
• 2009

Value-based requirements engineering process, called The ViRE(Value-Innovative Requirement Engineering) was suggested to create an uncontested market using ERRC(Eliminate, Reduce, Raise, Create) requirements analysis. But ViRE did not provides a quantitative data analysis method for ERRC decision so as to make objective decisions for customers. In this paper, to solve this problem, we suggest a quantitative ERRC analysis method by estimating requirements cost. Our method defines user requirements and decides their weight. Then, it makes quality level table for all the identified requirements and function modules and estimate implementation cost based on their quality levels. Finally, assess each requirement's impact and then evaluate ERRC value. We could get the more objective ERRC values by evaluate the requirement weight. functional module weight, and implementation cost. And we proved the efficiency of our model by a case study, smart student ID system.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2001년도 춘계학술대회 논문집
• /
• pp.622-626
• /
• 2001

Every design activity has a goal of satisfying a set of functional requirement. The commencement of a design, therefore, must have its foundation upon the identification of the functional requirements. Many of the design practices of the industrial examples can be categorized as design of small systems that are defined to have limited and fixed sets of functional requirements to be satisfied at all times. In the case of small systems it facilitates the construction of a knowledge-based system for a specific purpose to decompose the functional requirement and map ones in the lowest level into specific design features. When the number of design features is large, they need to be managed by groups. This paper suggests a grouping method for design process can be regarded as a series of selections of the predefined functional primitives according to the requirements and the preceding selections. An intelligent product design system for automatic transmission lever design is developed as an example.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2006년도 추계학술대회 논문집
• /
• pp.863-869
• /
• 2006

The existing Europe Standard, EN 50159 with respect of safety of railway signalling communication protocol has been changed into International Standard, IEC 62280. This Standard presents the requirement for safe communication between safety-related devices which connects with transmission system, there are both closed and open transmission system. Regardless of this international Standards, the communication protocol for interface between CTC communication server and external facilities has been standardized several years ago in our country, so this is applied to integrated CTC system in KORAIL. Two Standards are currently standardized as a protocol between CTC and external facilities, these standard protocols are also required high level safety as a communication link which is transmitted vital control information in common with the train control system. For that reason, we have made analysis of requirement for the safe transmission required by international standard. Under this analysis, we have studied safety features of communication protocol applying to our standard. In other words, we have researched that how many the requirement from international standard for safe transmission is reflected in domestic standard protocol, and also whether our standard makes sure of safety enough or not.