• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2004년도 학술대회지
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• pp.83-86
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• 2004

Index adjusted ration method has been widely utilized in public construction secter for contract sum adjustment by price fluctuation. In this method. the Production Price Index are used for calculating the base ratio. but the PPI can't reflect the property of construction project in respect of the selected item and weight structure. In this research we prove the problem of using the index adjusted ration method in contract sum adjustment by price fluctuation. and improve it by using the construction cost index. which has the property of construction project. And the result. we figure out the difference between the PPI and CCI by $6.7\%$ in maximum value.

• 한국경영과학회지
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• 제17권2호
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• pp.145-162
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• 1992

This paper proposes two design principles for expert systems to solve a stock market timing (SMART) problems : machine knowledge and fuzzy post-adjustment, Machine knowledge is derived from past SMART instances by using an inductive learning algorithm. A knowledge-based solution, which can be regarded as a prior SMART strategy, is then obtained on the basis of the machine knowledge. Fuzzy post-adjustment (FPA) refers to a Bayesian-like reasoning, allowing the prior SMART strategy to be revised by the fuzzy evaluation of environmental factors that might effect the SMART strategy. A prototype system, named K-SISS2 (Knowledge-based Stock Investment Support System 2), was implemented using the two design principles and tested for solving the SMART problem that is aimed at choosing the best time to buy or sell stocks. The prototype system worked very well in an actual stock investment situation, illustrating basic ideas and techniques underlying the suggested design principles.

• 전자공학회논문지A
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• 제31A권6호
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• pp.26-33
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• 1994

Much time and labor has been conventionally paid for fine adjustment of circuit elements by experience to improve the characteristics of Tap-off for CATV systems. To solve the problem, in this paper, the relations between the even- and odd-mode impedance. Z$_{oe}$ and Z$_{oo}$ of symmetrical 4-port coupled-line directional coupler and power dividing characteristics of Tap-off for CATV system have been derived. After the coupling, the reflectivity and the isolation are represented by Z$_{oe}$ and Z$_{oo}$ only, the fine adjustment of all S-parameters can be performed by controling the elements of Z$_{oe}$ and Z$_{oo}$ only. Furthermore, the validity of the new fine adjustment method proposed here has been confirmed by experiments.

• 가정과삶의질연구
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• 제17권3호
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• pp.203-216
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• 1999

The purpose of this study was to examine the trend of conflict of elderly coresiding adult children and to find out what behaviors they choose to cope with conflicts. Also this study tried to investigate how those coping behaviors affected elderly parents' psychological adjustment. The subjects of this study were 218 elderly parents coresiding with adult children in Seoul metropolitan areas. Data were analyzed by using statistics such as factor analysis t-test one-way ANOVA Pearson's correlation through SPSS/PC computer programs. The major findings were as follows: In general elderly parents perceived low level of conflicts with their adult children. Elderly parents with bad health condition no religion lack of personal expenses and low level of statndard of living showed more conflicts. Each of four major coping behaviors was affected by different factors. The most effective variables affecting elderly parents' psychological adjustment was active problem solving activity.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.29-35
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• 2024

TCP is considered as one of the major candidate transport protocols even for constrained IoT networks..In our previous work, we investigated the congestion control mechanism of the uIP TCP. Since the uIP TCP sets the window size to one segment by default, managing the retransmission timer is the primary approach to congestion control. However, the original uIP TCP sets the retransmission timer based on the fixed RTO, it performs poorly when a radio duty cycling mechanism is enabled and the hidden terminal problem is severe. In our previous work, we proposed a TCP retransmission timer adjustment scheme for uIP TCP which adopts the notion of weak RTT estimation of CoCoA, exponential backoffs with variable limits, and dithering. Although our previous work showed that the proposed retransmission timer adjustment scheme can improve performance, we observe that the scheme often causes a node to set the retransmission timer for an excessively too long time period. In this work, we show that slightly modifying the dithering mechanism of the previous scheme is effective for improving TCP fairness.

• 공학교육연구
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• 제15권4호
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• pp.35-40
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• 2012

This study presents an analysis of the current situation (management, approach, adjustment, transportation, and others) of teaching portfolio by examining the teaching portfolio managers (staffs, researchers, teaching assistants, etc.) of 6 universities in the southeast of Korea. The rationale for the study focus is that the existing teaching portfolio either suffers a problem in the transportation, approach, adjustment and/or management or is likely to raise a problem in the future. In order to solve this problem, this study builds a web-based e-teaching portfolio. According to the analysis results, the engineering education system was established in all 6 universities (Ed- note that '6 universities' has already been specified as the study sample). The teaching portfolio was partially digitalized in this system, despite some problems of converting analog data into digital data, which induced difficulties in constructing the overall e-teaching portfolio. Therefore, this study focused on constructing an e-teaching portfolio without developing any additional system by using the existing system positively, and also on determining the appropriate components among the existing teaching portfolio components. Accordingly, in order to convert the analog data into the digital data required for this study, we used a digital camera as the conversion device and converted the teaching portfolio components into those appropriate for the e-teaching portfolio. Finally, we constructed an existing system appropriate for the e-teaching portfolio by using these devices and components.

• 한국컴퓨터정보학회논문지
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• 제10권5호
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• pp.11-16
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• 2005

최근에 퍼지 이론을 인공 신경망에 접목하여 개선된 성능을 보이려는 경향이 많다. Goh는 퍼지단층 퍼셉트론 알고리즘과 일반적인 델타 규칙(Generalized delta rule)에 기반한 개선된 퍼지 퍼셉트론을 제안하여 Exclusive-OR(XOR) 문제 등을 해결하였다 그러나 이 방법은 계산량의 증가와 복잡한 영상인식에 적응하기에는 어려움이 있다. 논문에서는 동적 역치조정에 의한 개선된 퍼지 단층 퍼셉트론을 제안한다. 제안된 방법은 페턴인식의 벤치마크로 사용되는 XOR문제에 적용된다. 또한 영상 응용영역으로서 디지털 영상의 인식에 적용한다. 실험결과에서 항상 수렴하지는 않지만 그러나 제안된 모델은 학습시간의 개선과 높은 수렴율을 보였다.

• 한국정밀공학회지
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• 제12권7호
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• pp.32-45
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• 1995

In this paper, we present a new method to tool path planning problem for rough cut of pocket milling operations. The key idea is to formulate the tool path problem into a TSP (Travelling Salesman Problem) so that the powerful neural network approach can be effectively applied. Specifically, our method is composed of three procedures: a) discretization of the pocket area into a finite number of tool points, b) neural network approach (called SOM-Self Organizing Map) for path finding, and c) postprocessing for path smoothing and feedrate adjustment. By the neural network procedure, an efficient tool path (in the sense of path length and tool retraction) can be robustly obtained for any arbitrary shaped pockets with many islands. In the postprocessing, a) the detailed shape of the path is fine tuned by eliminating sharp corners of the path segments, and b) any cross-overs between the path segments and islands. With the determined tool path, the feedrate adjustment is finally performed for legitimate motion without requiring excessive cutting forces. The validity and powerfulness of the algorithm is demonstrated through various computer simulations and real machining.

• 한국산학기술학회논문지
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• 제21권1호
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• pp.338-348
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• 2020

본 연구는 아버지와 어머니의 우울수준의 종단적 상호관계를 파악하고, 아버지와 어머니 우울수준이 초등학교 자녀의 언어발달, 문제행동 및 학교적응에 미치는 영향은 어떠한지를 살펴보았다. 본 연구는 한국아동패널 4-8차년(2011~2015년)도 자료를 활용하여, 변수들 간의 종단적인 변화 관계를 추정하는데 적합한 잠재성장모형을 이용하여 분석하였다. 분석대상은 1,754 가구의 아버지, 어머니, 자녀였다. 분석결과 아버지 우울수준 초기값이 어머니 우울수준 변화율에 미치는 영향과 어머니 우울수준 초기값이 어머니 우울수준 변화율에 미치는 영향만이 통계적으로 유의한 것으로 나타났다. 즉, 어머니 우울은 어머니 자신의 우울 문제 뿐 아니라 아버지 우울 문제에 의해서 영향을 받는 우울의 자기효과와 상대방 효과가 동시에 나타났다. 아버지의 우울수준 초기값과 어머니 우울수준 초기값은 어머니 우울수준 변화율을 매개로 하여 자녀의 수용어휘, 내재화 및 외현화 문제행동, 학교생활적응, 학업적응, 또래적응에 간접적인 영향을 미치는 것으로 나타났다. 따라서 학령기 자녀의 건강한 발달과 학교적응을 위해 아버지 및 어머니 둘 다를 위한 우울 예방 및 개입 프로그램이 마련되어야 할 것이다.

• 한국아동복지학
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• 제27호
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• pp.69-93
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• 2008

본 연구는 부산지역의 중 고등학생 307명을 대상으로 각 학교에 근무하는 지역사회교육전문가들이 설문조사를 실시하여 청소년 자살의 영향요인을 검증하고자 하였다. 청소년들의 인구사회학적인 요인과 자아존중감, 우울, 자살생각, 학교적응정도 및 사회적 지지, 자기통제력, 문제해결능력 정도에 따른 자살가능성을 분석하였다. 그 결과 자살의 고위험 청소년과 그렇지 않은 청소년들은 인구사회학적인 요인에 있어서는 경제수준에서 유의미한 차이를 나타냈고, 그 외 모든 하위항목에서는 유의미한 차이를 보이는 것으로 나타났다. 또한 청소년 자살의 영향요인을 인구사회학적 요인, 개인적 요인, 학교 요인, 사회적 요인의 측면으로 분류하여 중다회귀분석을 실시하여 청소년 자살의 영향요인을 추출하였는데, 청소년자살에 영향을 미치는 요인으로는 학교적응정도, 문제해결능력, 자살생각의 정도, 우울 및 이웃 지지와 자기통제력으로 나타났다. 즉 청소년자살을 예방하기 위해서는 자살 생각의 정도를 측정하여 자살의 위험에 노출되어 있는 청소년들을 사정하여 선별한 후 학교적응력을 강화시키며, 문제해결능력과 자기통제력 강화를 위한 집단프로그램을 실시해야 할 것이다. 또한 청소년에 대한 사회적 지지를 강화시킴으로써 청소년자살을 예방할 수 있을 것이다.