• 대한전자공학회논문지SP
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• 제44권5호
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• pp.84-93
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• 2007

이 논문에서는 고속 FFT 구현을 위한 Radix-8 구조를 제안한다. 제안 FFT 구조의 핵심은 Radix-8 DIF(Decimation In Frequency) 나비연산기 구조이다. Radix-8 알고리즘은 고속처리는 가능하나 구현면적이 증가하는 단점이 있는데, 제안 구조는 곱셈연산을 DA(Distributed Arithmetic) 방식을 사용하여 구현함으로써 구현 면적이 증가하는 것을 줄일 수 있었다. 64-point FFT에 대하여 기존의 Radix-4 나비연산기와 제안된 Radix-8 나비연산기를 각각 사용하여 구현한 결과 구현면적이 49.2%가 증가하였다. 즉, Throughput을 2배로 증가시키기 위하여 하드웨어는 49.2%만 증가함을 Verilog-HDL 코딩을 통하여 확인하였다. 또한 기존 구조와 제안 구조가 같은 Throughput을 얻는 경우에는 전력소모가 25.4%가 감소하게 된다. 따라서 제안된 나비연산기를 사용하는 FFT 구조는 고속/저전력 FFT를 필요로하는 OFDM용 통신단말기에 사용될 수 있다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(1)
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• pp.125-128
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• 2002

This paper is about a high-speed MAC (multiplier and accumulator) design applying radix-4 and radix-8 Booth's algorithm at the same time. The optimized hybrid radix design for high speed MAC has taken advantage of both a radix-4 and a radix-8 architectures. A radix-4 architecture meets high-speed, but it takes much more power and chip area than a radix-8 architecture. A radix-8 architecture needs less power and chip area than the other, but it has a bottleneck of generating three times the multiplicand problem. An optimized hybrid architecture performs tile radix-4 multiplication partially in parallel with the generation of three times the multiplicand for use of tile radix-8 multiplication. It reduces the concerned bit width of multiplier in radix-8 multiplication.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(2)
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• pp.173-176
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• 2002

This paper is about a high-speed MAC (multiplier and accumulator) design applying radix-4 and radix-8 Booth's algorithm at the same time. The optimized hybrid radix design for high speed MAC has taken advantage of both a radix-4 and a radix-8 architectures. A radix-4 architecture meets high-speed, but it takes much more power and chip area than a radix-8 architecture. A radix-8 architecture needs less power and chip area than the other, but it has a bottleneck of generating three times the multiplicand problem. An optimized hybrid architecture performs the radix-4 multiplication partially in parallel with the generation of three times the multiplicand for use of the radix-8 multiplication. It reduces the concerned bit width of multiplier in radix-8 multiplication.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2007년도 하계종합학술대회 논문집
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• pp.85-86
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• 2007

In this paper, a Radix-8 structure for high-speed FFT is proposed. Even throughput of the Radix-8 FFT is twice than that of the Radix-4 FFT, implementation area of the Radix-8 is larger than that of Radix-4 FFT. But, implementation area of the proposed Radix-8 FFT was reduced by using DA(Distributed Arithmetic) for multiplication. The Verilog-HDL coding results for the proposed FFT structure show 49.2% cell area increment comparison with those of the conventional Radix-4 FFT structure. Namely, to speed up twice, 49.2% of area cost is required. In case of same throughput, power consumption of the proposed structure is reduced by 25.4%.

• 한국산학기술학회논문지
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• 제16권8호
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• pp.5579-5585
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• 2015

FFT(Fast Fourier Transform)는 DIT(Decimation -In-Time)와 DIF(Decimation-In-Frequency) 방식이 주로 사용되고 있다. DIF 방식은 Radix-2/4/8 등의 다양한 구조와 그 구현 방법이 개발되어 사용되고 있는데 반하여 DIT 방식은 순차적인 출력을 낼 수 있는 장점이 있음에도 불구하고 다양한 구조와 그 구현방법이 연구되지 못하였다. 이 논문에서는 순차적인 출력을 낼 수 있는 DIT Radix-8 FFT용 나비연산기 구조를 제안한다. 또한 기존에 주로 사용되어 온 Radix-2나 Radix-4 구조는 스테이지 수가 많아 연산지연시간이 길어지는 단점이 있다. 제안구조는 Radix-8의 알고리즘을 사용하였으므로 연산지연이 상대적으로 짧으며, 특히 큰 point의 FFT 구조의 경우에 스테이지의 수가 작아지는 장점을 갖는다. 제안구조의 나비연산기를 사용하여 4096-point FFT를 설계할 경우에, 4096개의 출력이 순서대로 출력되는 장점뿐 아니라 4개의 스테이지로 구성되므로 Radix-2를 사용하는 12 스테이지보다 연산지연이 짧은 장점을 갖는다. 따라서 제안 구조는 순차적인 출력과 짧은 연산지연을 요구하는 OFDM용 반도체 칩의 FFT 블록에 사용될 수 있다.

• 대한한의학방제학회지
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• 제18권2호
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• pp.1-14
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• 2010

This report describes 57 prescriptions including Paeoniae Radix and Glycyrrhizae Radix in Dongeuibogam. Paeoniae Radix and Glycyrrhizae Radix have been used separately or concurrently in Oriental Medicine for a long time as a treatment for various disease. The following conclusions are reached through investigations on the applications of prescriptions including Paeoniae Radix and Glycyrrhizae Radix in Dongeuibogam. 1. 7 times(12.3%) prescriptions are recorded in women chapter, 6 times(10.5%) in cold chapter, 5 times(8.8%) in stool chapter and fatigue chapter each, 4 times(7.0%) in psychiatry chapter, which are arranged in order of frequency. 2. Anxiety, Yin-Yang deficiency, stroke, treating blood, cataract, fever floating due to Yin deficiency, weak and fatigue, pregnancy, abortion, women accessary disease, cold-feeling heart pain, stiffness, etc, among 51 symptoms in prescriptions including Paeoniae Radix and Glycyrrhizae Radix. 3. The dosage of Paeoniae Radix and Glycyrrhizae Radix are from 5 pun:2.5 pun to 2 nyang:1 nyang. 1 jeon:5 pun is recored 39 times(68.4%), 2 jeon:1 jeon and 1 nyang:5 jeon is 6 times(3.21%), 2 nyang:1 nyang is 2 times(1.8%) used among 57 prescriptions including Paeoniae Radix and Glycyrrhizae Radix. 4. 57 prescriptions including Paeoniae Radix and Glycyrrhizae Radix are mostly composed of Samooltang and Sagoonjatang, Gyejitang, Gamgiltang, Bowontang, Goongguitang, Jeongwoneum, Bojoongikgitang, Jigoongsan, Ijintang, Pyeongwuisan, Oryungsan, etc, according to the usage.

• 생약학회지
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• 제16권2호
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• pp.81-92
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• 1985

The Polygoni Radix and Cynanchi Radix have been used to potentiate the liver functions in clinic of Oriental Medicine. The water extracts of Polygoni Radix and Cynanchi Radix were administered orally to rats intoxicated with carbon tetrachloride and then this experiment have been performed by observing liver fatty degeneration and activities of enzymes such as cytochrome oxidase (CYO), adenosine triphosphatase (ATP), acid phosphatase (ACP), lactate dehydrogenase (LDH) and alkaline phosphatase (ALP). By oral administration of water extracts of the radices between 1 and 10 days, the following results were obtained. 1. The group given Cynanchi Radix extract showed recovery of the fat liver in 4 days, whereas that given Polygoni Radix extract did the recovery in 8 days. 2. In cytochrome oxidase activity, the group given Cynanchi extract showed normal activity in 6 days, whereas that given Polygoni Radix extract did the activity in 8 days. 3. In adenosine triphosphatase activity, the groups given Cynanchi Radix and Polygoni Radix extracts showed normal activities in 2 and 8 days, respectively. 4. In acid phosphatase activity, the groups given Cynanchi Radix and Polygoni Radix extracts showed recovery of the activities in 2 and 4 days, respectively. 5. In lactate dehydrogenase activity, the group given Cynanchi Radix and Polygoni Radix extracts showed recovery of the activities in 6 and 10 days, respectively. 6. In alkaline phosphatase activity, the group given Cynanchi Radix extract showed normal activity in 2 days, whereas that given Polygoni Radix extract showed slight recovery between 4 and 6 days followed by decrease of the activity in 8 and 10 days. From the above-mentioned results, it was found that both of the water extracts of Polygoni and Cynanchi Radix possessed the recovery action of liver function as intoxicated with carbon tetrachloride in rats. It is also noted that the extract of Cynanchi Radix showed more potent activity than that of Polygoni Radix.

• Preventive Nutrition and Food Science
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• 제8권3호
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• pp.245-248
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• 2003

This study was undertaken to investigate the effects of the Ginseng radix in osteoporosis of the oophorectomized rats. In this experiment, the rats were oophorectomized and administered the water extracts of the Ginseng radix. The spinal bone mineral density, calcium, phosphorus and ash weight of the bones were measured. The spinal bone mineral density was significantly increased in the ovariectomized (OVX)-Ginseng radix group at 8 weeks as compared to the OVX-saline group. Furthermore, the calcium and phosphorus contents of the femoral and fibula-tibia were significantly increased in the OVX-Ginseng radix group as compared to the OVX-saline group. The ash weights of the femoral and fibula-tibial bones were increases in the OVX-Ginseng Radix group, although it was not statistically significant. On reviewing these experiments, it appears that the Ginseng radix possess efficacy for the prevention of osteoporosis. Further study would be of value to confirm the efficacy of the Ginseng radix for the treatment and/or prevention of osteoporosis in humans.

• 혜화의학회지
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• 제14권1호
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• pp.179-186
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• 2005

In oriental medicine, Achyranthis Bidentatae Radix & Dipsaci Radix are frequently used materials for strenthing lumbar and knees. Bang-Yak-Hap-Pyun(方藥合編) is widely used for clinical herbal prescription book. In Bang-Yak-Hap-Pyun, Achyranthis Bidentatae Radix is used 1g~8g. and Dipsaci Radix is used 1g~3.2g. The most important fact is that the prescription used chyranthis Bidentatae Radix & Dipsaci Radix at the same time is only 1(Man-Geum-Tang-the ratio of Achyranthis Bidentatae Radix & Dipsaci Radix is 1:1). The number of prescription Achyranthis Bidentatae Radix & Dipsaci Radix in Bang-Yak-Hap-Pyun is total 19. 14 in sang-tong(上統), 2 in jung-tong(中統), 3 in ha-tong(下統). The group of mostly used disease is about lumbar and knees. The ratio of Achyranthis Bidentatae Radix in Bang-Yak-Hap-Pyun is 3.88%~25%. And the ratio of Dipsaci Radix is 8.33%~12.5%. The mostly quoted medical literature what prescription included Achyranthis Bidentatae Radix & Dipsaci Radix in Bang-Yak-Hap-Pyun is Dong-Yi-Bo-Gam and Gyung-Ak-Jun-Su Sin-Bang-Pal-Jin.

• 디지털융복합연구
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• 제11권2호
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• pp.287-297
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• 2013

본 논문은 OFDM 시스템을 위한 효율적인 가변길이 radix-8/4/2 FFT 구조를 제안하였다. radix-8/4/2 연산을 수행하기 위해서 제안한 FFT 프로세서는 shared memory 구조를 사용하여 하드웨어가 단순하고 적은 면적을 차지한다. 메모리 사이즈를 줄이고 데이터들 간의 충돌을 피하기 위해 효율적인 In-place 메모리 엑세스 방법을 제안한다. 또한 회전인자(twiddle factor)를 위한 ROM 기반의 lookup 테이블 방식을 대신하여 적은 면적을 차지하는 회전인자 발생기를 제안한다. 제안한 FFT 프로세서는 802.11a, 802.16a, DAB, DVB-T/H 그리고 xDSL에서 요구하는 모든 FFT 샘플링 포인트인 64, 256, 512, 1024, 2048, 4096 그리고 8192 포인트의 FFT 연산을 할 수 있다.