• 핵의학기술
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• 제16권1호
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• pp.96-101
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• 2012

사구체 여과율은 신기능의 평가 및 신 질환의 조기 발견 및 만성 신 질환 환자의 경과 관찰에 중요한 지표가 된다. 본 연구에서는 동적 신장 신티그래피의 Gates법과 Modified Gates법을 채혈을 이용한 MDRD법 공식을 기준으로 그 차이를 비교, 분석하고자 한다. 2010년 11월부터 2011년 8월까지 본원에 내원하여 신장 신티그래피 검사를 시행한 45명의 환자를 대상으로 시행하였다. 이 중 20명의 환자는 AGUS(Philips Medical System, Cleveland, OH, USA) 장비의 Gates법과 MDRD법(Modification of Diet Renal Disease) 공식에 의한 사구체 여과율 값을 비교하였으며, 20명의 환자는 INFINIA (General Electric Healthcare, Wisconsin, MI, USA) 장비의 Modified Gates법과 MDRD법 공식에 의한 사구체 여과율 값을 비교하였다. 마지막으로 경과 관찰 시 MDRD법 공식에 의한 사구체 여과율 변화가 없는 환자 5명을 대상으로 Gates법과 Modified Gates법을 비교하였다. Gates법과 Modified Gates법 모두 MDRD법 공식에 의한 사구체 여과율 값과 높은 상관 관계를 보였으며($p$<0.01, r=0.903, r=0.867), Gates법의 대응 차 평균은 $2.05{\pm}2.54mL/min/1.73m^2$로 나타났고, Modified Gates법의 대응 차 평균은 $25.2{\pm}3.71mL/min/1.73m^2$로 나타났다. 마지막으로 5명의 환자에서 실시된 Gates법과 Modified Gates법의 비교는 높은 상관 관계를 보였으며($p$<0.05, r=0.949), 대응 차 평균은 $20.4{\pm}8.84mL/min/1.73m^2$ 로 나타났다. Gates법과 Modified Gates법 및 MDRD법 공식에 의한 사구체 여과율 값은 서로 높은 상관 관계를 보였다. 동적 신장 신티그래피 검사 시 사용되는 Gates법과 Modified Gates법의 상관 관계를 인지하고 검사를 진행 한다면, 진단능을 향상시켜 정확한 신기능의 평가가 이루어질 것으로 사료된다.

• 전기학회논문지
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• 제56권4호
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• pp.745-750
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• 2007

In this paper, we propose a new gate modification method using the input vector maximizes the number of gates in WLS within the optimum range of the minimum leakage power. We prove that MLV is not always the optimal solution, and that the leakage power and area can decrease when modifying the gates using the input vector for which the number of gates in WLS is maximized within the optimum range of the minimum leakage power for the circuits applying the IVC technique and gate modification method. Using the proposed method, the gate-level description circuit can be converted to the modified circuit which reduces the leakage power by chip designer, and the modified circuit can be applied without any modification in design flow.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.787-791
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• 1996

In injection molding, location of gates have great influence on the quality of plastic parts. Usually, they are located by releated trial and errors of experienced mold designers. In this topic we will present the numerical algorithm for finding the optimal gate locations. Optimization algorithm is devided into two stages. In the first stage, candidated optimal gate locations can be found by geometry of part only; whereas in the next step, more acculate gate locations are selected byiterative computation with optimization part and analysis part. So from the following study, we suggested the modified flow-volume method, which will define the optimal gate locations in injection mold design.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.821-824
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• 1999

In distributed arithmetic-based architecture for an inner product between two length-N vectors, the size of the ROM increases exponentially with N. Moreover, the ROMs are generally the bottleneck of speed, especially when their sire is large. In this paper, a ROM size reduction technique for DA (Distributed Arithmetic) is proposed. The proposed method is based on modified OBC (Offset Binary Coding) and control circuit reduction technique. By simulations, it is shown that the use of the proposed technique can result in reduction in the number of gates up to 50%.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.154-157
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• 2003

In order for testing faults of combinatorial logic circuit, the authors have developed a new diagnosis method: "Neural Network (NN) fault diagnosis", based on fm error back propagation functions. This method has proved the capability to test gate faults of wider range including so called SSA (single stuck-at) faults, without assuming neither any set of test data nor diagnosis dictionaries. In this paper, it is further shown that what kind of fault models can be detected in the NN fault diagnosis, and the simply modified one can extend to test delay faults, e.g. logic hazard as long as the delays are confined to those due to gates, not to signal lines.

• 한국통신학회논문지
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• 제25권3B호
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• pp.584-591
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• 2000

본 논문에서는 벡터의 내적에 사용되는 Distributed Arithmetic의 ROM 면적을 줄일 수 있는 방법을 제시한다. 제안된 방법을 이용하여 만든 ROM table은 그 크기가 기존 방법에 비해 반으로 감소되며 새로 생성된 ROM table에 같은 방법을 반복 적용함으로써 그 크기를 계속 1/2씩 감소시킬 수 있다. 반면에 ROM table을 반으로 줄일 때마다 논리회로의 첨가로 인한 하드웨어의 증가와 critical path의 증가가 발생하는데, 이들 오버헤드를 최소화할 수 있는 방법과 전체적인 면적 감소 효과를 극대화 할 수 있는 방법을 함께 제시한다. 제시한 방법을 적용함으로써 약 50%까지의 하드웨어를 감소시킬 수 있음을 예를 통하여 보인다.

• Restorative Dentistry and Endodontics
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• 제24권2호
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• pp.337-345
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• 1999

The purpose of this study was to compare the shape of root canal after instrumentation with some engine driven NiTi files. Thirty narrow and curved canals(15-35 degree) of mesial canals of extracted human mandibular first molars were divided into three groups. Group 1: After radicular access with Gates Glidden drill, apical shaping using step back method with Flexo file Group 2: After radicular access with Gates Glidden drill, apical shaping with Profile .04 Group 3: Canal shaping with GT file and Profile .04. Using modified Bramante technique, the root was sectioned at 2 mm from apical foramen, height of curvature, 2 mm from canal orifice. Canal centering ratio, amount of transport, amount of dentin removed, shape of canal were measured and statistical analysis is done using SPSS Program V 7.5. The results were as follows: 1. Canal centering ratio of group 3 was the lowest at coronal part, but there was no statistical difference. Centering ratio of group 2 was the lowest at curve part, and there was statistical difference between group 1(P<0.05). Centering ratio of group 2 was the lowest at apical part, but there was no statistic difference. 2. Amount of transport of group 3 was the lowest at coronal part, but there was no statistical difference. Amount of transport of group 2 was the lowest at curve part, and there was statistical difference between group 1(P<0.05). Amount of transport of group 3 was the lowest at apical part, and there was statistical difference between group 1 and group 2, group 1 and group 3(P<0.05). 3. Amount of dentin removed of group 3 was the lowest at coronal part, bur there was no statistical difference. Amount of dentin removed of group 2 was the lowest at curve part, but there was no statistical difference. Amount of dentin removed or group 2 was the lowest at apical part, and there was statistical difference between group 1 and group 2, group 1 and group 3(P<0.05). 4. The shape of the canals after instrumentation varied among the groups. The majority of canals at coronal and curve part for group 1 were round in shape(7 in 10), those at apical part were oval(8 in 10). The majority of canals at coronal part for group 2 were round in shape(7 in 10) and there was no difference in the number of shape at other part. There was no difference in the number of shape at every part for group 3. As above results, NiTi rotary instrumentation showed a trend to remain more centered in the canal than SS file instrumentation. At using NiTi file, coronal shaping with Gates Glidden drill was not statistically different from shaping with GT file. But shaping with GT file showed tapered canals, so it may be said that shaping with GT file is a safe and valuable instrumentation method.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2002년도 춘계학술대회논문집
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• pp.197-203
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• 2002

The estimation of pile bearing capacity is important since the design details are determined from the result. There are numerous ways of determining the pile design load, but only few of them are chosen in the actual design. According to the recent investigation in Korea, the formulas proposed by Meyerhof based on the SPT N values are most frequently chosen in the design stage. In the study, various static and dynamic formulas have been used in predicting the allowable bearing capacity of a pile. Further, the reliability of these formulas has been verified by comparing the perdicted values with the static and dynamic load test measurements. Also in cases, these methods of pile bearing capacity determination do not take the time effect consideration, the actual allowable load as determined from pile load test indicates severe deviation from the design value. The principle results of this study are summarized as follows : A a result of estimate the reliability in criterion of the Davisson method, in was showed that Terzaghi & Peck > Chin > Meyerhof > Modified Meyerhof method was the most reliable method for the prediction of bearing capacity. Comparisons of the various pile-driving formulas showed that Modified Engineering News was the most reliable method. However, a significant error happened between dynamic bearing capacity equation was judged that uncertainty of hammer efficiency, characteristics of variable , time effect etc... was not considered. As a result of considering time effect increased skin friction capacity higher than end bearing capacity. It was found out that it would be possible to increase the skin friction capacity 1.99 times higher than a driving. As a result of considering 7 day's time effect, it was obtained that Engineering News. Modified Engineering News. Hiley, Danish, Gates, CAPWAP(CAse Pile Wave Analysis Program ) analysis for relation, respectively, $Q_{u(Restrike)}$ $Q_{u(EOID)}$ = 0.971 $t_{0.1}$, 0.968 $t_{0.1}$, 1.192 $t_{0.1}$, 0.88 $t_{0.1}$, 0.889 $t_{0.1}$, 0.966 $t_{0.1}$, 0.889 $t_{0.1}$, 0.966 $t_{0.1}$

• 대한전자공학회논문지SD
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• 제47권8호
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• pp.29-35
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• 2010

본 논문에서는 내장된 자체 테스트 기법 (BIST, Built-In Self Test)을 적용 할 때 저전력 테스트가 가능한 패턴 생성기를 제안하였다. 테스트 시 WSA (Weighted Switching Activity)가 많이 발생하는 노드인 heavy nodes의 선택 알고리듬을 제안하였으며, heavy nodes에 천이를 발생시키는 입력부 곧 heavy inputs을 찾는 알고리듬을 나타내었다. 고장 검출율을 높이는 최적의 heavy nodes의 수를 결정하고 선택된 입력부에 변형된 LFSR의 출력을 인가하여 테스트 시 발생하는 천이를 줄였다. 제안하는 패턴 생성기는 몇 개의 AND 게이트와 OR 게이트를 LFSR에 추가하여 적은 하드웨어 오버헤드로 간단히 구현된다. ISCAS 벤치 회로에 적용한 실험을 통해 제시하는 방법이 기존의 기법에 비해 평균 소비 전력을 감소시키면서 고장 검출율을 상승시키는 것을 검증하였다.

• 한국광학회지
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• 제19권1호
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• pp.60-67
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• 2008

전광 그레이코드(gray code) 이진코드(binary code) 변환기를 상용화 전산모사 프로그램(VPI)을 이용하여 처음으로 구현하였다. 전자회로 디자인 방법을 상호 이득변조를 이용한 전광 논리회로에 적합하도록 변형하여, 이상적이지 않은 전광 논리게이트에 의한 신호 왜곡이 최소화 되도록 하였다. 2.5 Gbps의 20 dB 소광비를 가지는 입력 신호에 대해, 신호재생기 없이 가장 많이 왜곡된 출력 신호에 (최하위 비트-LSB) 대해 약 4 이상의 Q값을 얻을 수 있었다. 또한 그레이 코드 이진코드 변환기를 디자인하면서, 이단 단순화 방법을 (two-level simplification method) 변형하여, 그레이코드 이진코드 변환기뿐 아니라 일반적인 전광 회로에 적용할 할 수 있는 일반적 방법을(일단 단순화 방법: one-level simplification method) 얻을 수 있었다.