• The KIPS Transactions:PartA
• /
• v.17A no.2
• /
• pp.81-92
• /
• 2010

There has been some research in the equipment defect detection based on vibration information. Most research of them is based on vibration monitoring to determine the equipment defect or not. In this paper, we introduce more accurate system for engine defect detection based on vibration information and we focus on detection of engine defect for boat and system control. First, it uses the duplicated-checking method for vibration information to determine the engine defect or not. If there is a defect happened, we use the method using error part of vibration information basis with error range to determine which kind of error is happened. On the other hand, we use the engine trend analysis and standard of safety engine to implement the vibration information database. Our simulation results show that the probability of engine defect determination is 100% and the probability of engine defect classification and detection is 96%.

• Journal of Navigation and Port Research
• /
• v.33 no.10
• /
• pp.671-678
• /
• 2009

Recently, there have been some researches in the equipment fault detection based on shock and vibration information. Most research of them is based on shock and vibration monitoring to determine the equipment fault or not. Different with engine fault detection based on shock and vibration information we focus on detection of engine for boat and system control. First, it use the duplicated-checking method for shock and vibration information to determine the engine fault or not. If there is a fault happened, we use the integral to determine the error engine shock wave width and detect the fault area. On the other hand, we use the engine trend analysis and standard of safety engine to implement the shock and vibration information database. Our simulation results show that the probability of engine fault determination is 98% and the probability of engine fault detection is 72%

• Journal of the Institute of Electronics and Information Engineers
• /
• v.51 no.8
• /
• pp.156-164
• /
• 2014

In a delay line type of a time-to-digital converter implemented in Field Programmable Gate Array, the timing accuracy decreases for a longer carry chain. In this paper, we propose a structure that has a multi-phase clock and a state machine to check metastability; this would reduce the required length of the carry chain with the same time resolution. To reduce the errors caused by the time difference in the four delay lines associated with a four-phase clock, the proposed TDC generates a single input pulse from four phase clocks and uses a single delay line. Moreover, the state machine is designed to find the phase clock that is used to generate the single input pulse and determine the metastable state without a synchronizer. With the measurement range of 1 ms, the measured resolution was 22 ps, and the non-linearity was 25 ps.

• Journal of the Korean Society of Radiology
• /
• v.13 no.2
• /
• pp.305-311
• /
• 2019

In this study, present the most useful delay scan time by statistical analysis of SUVm data for 30 suspected pancreatic cancer patients. Two statistical analysis and a mathematical model was applied to the theoretical formula by glucose and insulin mechanics, and a mathematical model was created. Statistical analysis was performed via Metlab p/g. Optimal delay scan time was suggested by Metlab p/g for the change of SUV value over time.In this study, for diagnosis pancreatic cancer by dual time point PET/CT, propose optimal delay scan time 131.5 minuts. The proposed delay scan time showed statistical reliability applicable to the diagnosis of pancreatic cancer (p<0.05). Delayed scanning with the suggested delay scan time of 131.5 minutes is considered to be useful for the diagnosis of pancreatic cancer compared to general PET / CT scan.hen the delayed test is performed with the proposed delay scan time 131.5 minuts, Compared with general PET/CT scans.

• Korean Journal of Cognitive Science
• /
• v.14 no.4
• /
• pp.21-31
• /
• 2003

This paper reports our experimental study with Korean-Chinese (=KC) bilinguals as compared with Korean monolinguals. We aim to find KC bilingual speakers' sentence processing strategies, and the interaction between the Ll and U2 grammars in bilingual development. To this end, we recruited 166 subjects of all age groups from age 3 to adult in the Korean autonomous community in Yanji, China, and did a classical subject/actor identification test, where subjects are supposed to pick out the subjects/actor of both sensical and nonsensical sentences (cf. Liu, Bates & Li, 1992). We compared our results with our previous work on monolingual Koreans, and found out that KC bilinguals rely on word order as well as anumacy; that KC bilinguals make use of morphology at age 10 as compared with age 5 for monolinguals; and that KC bilingual adults rely on animacy and word order as well as morphology, while monolingual Korean adults rely solely on morphology for sentence interpretation. Given that animacy and word order play an important role in the Chinese grammar, our finding lends support to the backward transfer which Liu, Bates & Li (1992) propose for early bilingualism.

• Journal of Embryo Transfer
• /
• v.3 no.1
• /
• pp.48-52
• /
• 1988

우수정란의 이식전 성판별이 관한 연구를 수행하기 위하여 GTH와 PGF$_2$$\alpha$투여에 대한 난소반응과 회수난자의 발유단계별 동결융해후 생존성을 조사하였으며, 이식전 수정라느이 성판별을 위하여 H-Y항체 처리후 정상발육 난자의 염색체를 분석하여 다음과 같은 결과를 얻었다. 웅성 비장세포(male, spleen cells)를 면역원으로 mouse와 rat에 투여, 항혈청의 항체를 확인한 결과 mouse에서는 C57 BL계통과 rat에서는 DonRyu 계통이 항체생산능력이 우수하였다. 공란우 87두에 hormone(2500IU PMSG, 25mg PGF$_2$alpha)처리하여 평균 57.8%의 채란유과 두당 4.9개의 난자가 회수되었으며, 전체회수란자(427개)중 moula(162개)와 blastocyst(190개)의 정상발육란자는 82.4%였다. 동결융해후 회수된 난자 (312개)중, 형태적으로 정상인 난자(241개)의 비율은 77.2% 발육단계별 성적은 blastocyst(83.4%)가 morula(71.0%)보다 우수하였다. 항체와 보체(Guinea pig serum)로 처리된 82개의 morula중 15개(18.3%)가 blastocyst로 발육되어 이중 5개(33.3%)가 성이 판별되었으며, 모두 xx형 성염색체를 갖는 자성수정란으로 판명되었다.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.50 no.9
• /
• pp.68-73
• /
• 2013

In this paper, we proposed a readout circuit of pulse waveform and rate for a U-health system to monitor health condition. For long-time operation without replacing or charging a battery, either pulse waveform or pulse rate is selected as the output data of the proposed readout circuit according to health condition of a user. The proposed readout circuit consists of a simple digital logic discriminator and a dual-mode ADC which operates in the ADC mode or in the count mode. Firstly, the readout circuit counts pulse rate for 4 seconds in the count mode using the dual-mode ADC. Health condition is examined after the counted pulse rate is accumulated for 1 minute in the discriminator. If the pulse rate is out of the preset normal range, the dual-mode ADC operates in the ADC mode where pulse waveform is converted into 10-bit digital data with the sampling frequency of 1 kHz. These data are stored in a buffer and transmitted by 620 kbps to an external monitor through a RF transmitter. The data transmission period of the RF transmitter depends on the operation mode. It is generally 1 minute in the normal situation or 1 ms in the emergency situation. The proposed readout circuit was designed with $0.11{\mu}m$ process technology. The chip area is $460{\times}800{\mu}m^2$. According to measurement, the power consumption is $161.8{\mu}W$ in the count mode and $507.3{\mu}W$ in the ADC mode with the operating voltage of 1 V.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.28 no.3C
• /
• pp.239-247
• /
• 2003

This paper presents a dual-rate (2.4/4.0 kbps) Improved Harmonic-CELP(IHC) speech coder based on the EHC(Efficient Harmonic-CELP) which was presented by the authors. The proposed IHC employs the harmonic coding for voiced and the CELP for unvoiced segments. In the IHC, an initial voiced/unvoiced estimate is obtained by the pitch gain and energy. Then, the final V/UV mode is decided by using the frame energy contour. A new harmonic estimation combining peak picking and delta adjustment provides a more reliable harmonic estimation than that in the EHC. In addition, a noise mixing scheme in conjunction with an improved band voicing measurement provides the naturalness of the synthesized speech. To demonstrate the performance of the proposed IHC coder, the coder has been implemented and compared with the 2.0/4.0 kbps HVXC(Harmonic excitation Vector Coding) standardized by MPEG-4. Results of subjective evaluation showed that the proposed IHC coder and produce better speech quality than the HVXC, with only 40% complexity of the HVXC.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
• /
• 1997.11a
• /
• pp.183-188
• /
• 1997

안구의 운동은 시각 환경에서의 진행중인 정보처리와 관련된 지각적, 인지적 과정을 밀접히 반영하는 중요한 지표로서, 특히 공간 지각과의 상관은 비교적 명확히 확립되어 있다. 본 연구는 공간지각에 관여하는 안구운동의 특성을 파악하여, 공간지각을 반영하는 안구운동 지표를 개발한다는 목표 아래, 피험자가 느끼는 공간의 확장과 축소의 특성을 이중도약과제(double-step paraeigm)를 사용하여 관찰한 것이다. 이중도약과제는 도약(saccadic)안구운동의 오차를 유발시키는 실험기법으로, 두개의 시각자극을 하나씩 연속적으로 보여주되, 두번째 자극은 안구운동이 일어나는 도중에 제시하는 것으로서, 인위적으로 왜곡된 공간에 대한 피험자의 공간적응을 관찰하는데 사용되었다. 이 과제는 다시 자극의 이차도약 방향에 따라 축소감 조건과 확장감 조건으로 나뉘었고, 머리운동의 역할을 판별하기 위해 머리를 고정한 조건과 머리를 자유롭게한 조건으로 분류되었다. 그 결과 머리가 고정된 상태에서는 축소감 조건에 대한 적응이 확장감 조건에서보다 더 빨리 일어나고, 그 적응후의 시선이동의 변화량에서도 축소감 조건이 더 크게 나타났다. 또한 머리를 자유롭게 할 공간 지각의 정확성이 증가하며, 축소감과 확장감 경험속도의 차이가 약 49.2%까지 해소되었으나, 여전히 축소감의 경험이 더 잘 일어났다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2010.11a
• /
• pp.82-85
• /
• 2010

인터넷의 급속한 발달과 이미지 콘텐츠 개발 기술의 발달로 현재 누구나 쉽게 이미지 콘텐츠의 공유 및 배급이 용이해졌다. 그러나 이로 인해 누드나 포르노와 같은 불건전한 유해 이미지들의 접근 역시 쉬워지고 있다. 특히, 스마트 폰이나 스마트 TV 등 멀티미디어 기능이 가능한 휴대장치 및 단말기의 비약적인 발전으로 인하여, 언제 어디서나 우리들은 유해 이미지의 노출되어 있다. 따라서 유해 이미지 시청이 적당하지 않은 연령층까지 무방비 상태에 놓여 있기 때문에 이를 막을 수 있는 시급한 대책이 요구되고 있다. 본 논문에서는 이중 피부 화소 검출에 이용하여 인체 영역 검출해내고 이것을 이용하여 유해 이미지 분류를 위한 방법을 제안하고자 한다. 일반적으로 피부 화소 검출 기법은 오차율을 가지고 있기 때문에 정확한 검출이 힘들다. 따라서 우리는 검출에 대한 강도를 조절하여 이중으로 피부 화소를 검출하여 좀더 정확한 피부 영역을 획득한다. 또한 기존의 방법들은 대체로 일차적인 피부 영역 검출에 초점을 둔 반면, 유해 판별의 주된 기준이 되는 가슴이나 성기, 엉덩이 등을 좀 더 중점적으로 찾으려 하지 않았다. 따라서 본 논문에서는 검출된 피부 영역에서 유해 부위를 좀 더 집중적으로 찾아 유해 판별 성능을 높이는 방법을 제안하고 실험으로 증명을 하고자 한다.