In turbopump type liquid rocket engines, ignition and starting are known to be the most unstable and risky section among all operating sections of the projectile. The operation of the liquid rocket engine is the process of ignition and combustion of the main combustor after the turbo pump is driven into a stable section due to the turbine driving of the turbo pump and the ignition and combustion of the gas generator by the pyro starter. In this process, the driving of related components directly influences each other, so each component must be operated with sufficient reliability. In particular, if the igniter does not supply sufficient ignition energy at a predetermined time, an explosion may occur due to stagnation of the fuel/oxidant mixture, so reliability is more important. In this study, the fracture analysis of the gas generator igniter rupture disk according to the shape was performed using computational analysis. As a result, comparative analysis was performed to obtain the optimal dimensions according to each variable condition.

This paper aims to explore how Korean-Chinese bilingual speakers process Korean final ending -ko. Korean-Chinese bilingual speakers from Yanbian participated in the masked priming experiments through a word judgment task. The masked priming experiments were designed to compare the subjects’ response under three different prime-target conditions: Identical Condition, Unrelated Condition, and Test Condition. The participants’ response time in the experiments was statistically analyzed in two different ways: i.e., subject (F1) analyses and item (F2) analyses. The results of both the subject analyses and the item analyses revealed full priming effects, as is usually found in native speakers’ morphological processing. These findings indicate that Chinese-Korean bilingual speakers are sensitive to each combining morpheme of morphologically complex words including Korean final ending -ko and their processing of the words are not dependent upon the lexical storage of the full form.

The effect of water vapor addition on the ignition delay of iso-octane/air mixture was numerically investigated with detailed chemical reaction mechanism. The Chemkin-III was utilized to evaluate the delay time of autoignition for isobaric conditions. By dilution effect and thermal effect, water vapor addition increases the ignition delay time. However, the chemical effect by adding water vapor makes the ignition delay shortened. The ignition delay by the chemical effect is reduced by two ways. Dissociation of water vapor increases the quantities of OH and H. One way is that OH directly makes the rate of iso-octane oxidation reaction 2 increase. The other is that HO2 is produced more by three-body reaction, H+O2+M →HO 2+M, which makes the rate of iso-octane oxidation reaction 3 increase. All trends of three effects are similar according to water vapor addition.

In this paper, the combustion characteristics of constant volume combustion chamber(CVCC) were experimentally investigated when biodiesel is mixed with pure gasoline. The experiment was performed on two gasoline biodiesel samples designated by GB05 and GB20 which is mixed with 5% and 20% biodiesel respectively. It was confirmed that the ignition delay time decreases as the temperature of injection engine increases due to ignition delay. Also, it was shown that the ignition delay time decreases as the biodisel mixing ratio increases from 5% to 20%.

This paper investigates Korean-Chinese bilingual speakers’ processing of Korean plural marker -tul. It employed masked priming experiments with a word judgment task for Korean-Chinese speakers from Yanbian, China. The masked priming experiments compared the subjects’ response time in three different prime-target pairs: identical condition, unrelated condition, and test condition. The data of the experiments was analyzed in two different ways: subject analyses and item analyses. The subject analyses of the study showed partial priming effects and the item analyses full priming effects. These findings indicate that Chinese-Korean bilinguals seem to be sensitive to morphological structure of a morphologically complex words in Korean and less dependent on the lexical storage of the full form, as is usually found in L2 learners’ morphological processing.

The autoignition characteristics of n-heptane/n-butanol were investigated both experimentally and numerically. The effects of oxygen concentration and exhaust gas recirculation rate on the autoignition characteristics were evaluated. A rapid compression machine was employed to measure ignition delay times of blended fuels. A numerical study on the ignition delay time was performed using the CHEMKIN-PRO software to calculate ignition delay time and predict the chemical species in the combustion process. The results revealed that the ignition delay time increased with decreasing oxygen concentration due to the thermal load effect of nitrogen. The oxidation reaction of n-heptane in a low temperature regime was limited with decreasing oxygen concentration. The ignition delay time sharply decreased with exhaust gas recirculation because of the intermediate species in the exhaust gas. Exhaust gas recirculation reduced first ignition delay dramatically. However, the time interval between the first and main ignition increased with increased exhaust gas recirculation.

In this paper, the influence of the injector failure of the GDI engine on the air-fuel ratio inside the combustion chamber can be analyzed through time and shape analysis of the damping process of the ignition coil secondary waveform at 800rpm, 1500rpm, 2000rpm, 3000rpm. In particular, there is a correlation that affects air pollution associated with global warming, such as HC and NOx. To prevent this, periodic injector inspections can improve the fuel efficiency of the vehicle and reduce exhaust pollutants.

The test was done on cars travelling at the speeds of 20km/h, 60km/h and 100km/h using the performance testing mode for chassis dynamometer. In this test, the secondary ignition waveform, exhaust emissions and fuel consumption were measured in case of faulty MAP sensor, faulty oxygen sensor and spark plugs. The following results from the related analysis of secondary waveform, emission and fuel consumption measurements were obtained : 1) The fuel consumption was higher in the order of oxygen sensor trouble, MAP trouble, spark plug trouble, before maintenance and after maintenance. Maximum fuel economy is 9.3km/L, the minimum fuel economy is 3.2km/L, the difference between max. and min. is 65.5%. 2) If you compare the oxygen sensor trouble with after maintenance, the CO has improved an average of 98%, fuel economy average of 60%. And the HC has improved an average of 87%, fuel economy average of 60%. The fuel consumption and exhaust gas was bad in the order of oxygen sensor trouble, MAP trouble and S/P trouble.

This study investigates the effects of syntactic priming on the learning of the ditransitive construction by 49 Korean elementary school English learners. In this study the effects of syntactic priming were scrutinized more in detail by implementing it in three different input frequency conditions: Skewed-first distribution, balanced distribution, and the control. Results indicated that syntactic priming overall had facilitative effects on the oral production performance of the participants. When it comes to the participants’ comprehension of the target construction, however, it was only in the skewed-first distribution that priming had a substantial learning effect. It is concluded that priming combined with the skewed-first type of input distribution would have generalizable and durable learning effects.

결과에 대한 원인을 추론하는 인지적 정보처리과정에 대한 연구에는 많은 성과가 있었다. 그러나 서로 다른 원인의 무의식적 점화가 과제 결과의 만족도와 과제 재수행에 관한 의사결정에 미치는 영향을 검증한 연구는 찾아보기 어렵다. 본 연구는 암묵적 귀인점화 절차를 사용하여 과제의 결과를 우연 또는 개인적인 노력에 귀인시키는 것이 과제에 대한 만족도와 과제 재수행 의도에 미치는 효과를 알아보기 위해 수행되었다. 이를 위해 지시문을 사용하여 우연과 노력 조건별로 실험참가자들을 점화한 후, O/X 퀴즈 과제 (실험 1) 또는 5지선다형 문제 (실험 2)를 풀게 하였다. 그리고 실제 과제수행 결과와 관계없이 ‘좋음’ 또는 ‘나쁨’의 피드백을 주고 과제 만족도와 과제의 재수행 의도를 측정하였다. 분석 결과, 과제 만족도는 주로 피드백에 의해 영향을 받지만, 과제 재수행 의도는 피드백과 점화 유형에 따라 상호작용이 있음이 관찰되었다. 즉, ‘좋음’ 의 피드백 을 받은 조건의 경우, 우연 점화 참가자들보다 노력 점화 참가자들에게서 재수행의도가 높게 나타났고, ‘나쁨’ 의 피드백을 받은 조건에서는 우연 점화 참가자들이 노력 점화 참가자들보다 재수행의도가 높았다. 본 연구의 결과는 귀인과 의사결정 관련 연구뿐만 아니라 중독 관련 상담심리연구에도 이론적, 실무적 시사점을 줄 수 있을 것으로 기대한다.

This article aims to explore the interactive roles of types of primed identity (local versus global identity) and types of ad framing on brand evaluations. The authors designed 2 experiments in which each experiment followed a 2×2 between-subject design. The empirical results showed that a gain-framed ad induced more positive emotional responses than a loss-framed ad, and the positive affective responses lead to more favorable brand evaluation. Furthermore, the results showed that there were interactive effects of primed identity and types of advertisement frame on brand evaluation. In the additional analysis, the results showed that when people with local identity were exposed to the gain-framed ad, they would engage in a higher level of integration processing than those in the control group, which in turn induced more favorable evaluation to the local brand. That is, the integration processing mode played a mediating role between the interaction (local id priming × ad frame) and the local brand evaluation. However, in the case of global brand evaluation, the integration processing mode did not play such a mediating role.

사용성은 제품의 사용 과정에서 지각되는 학습 용이성, 효율성, 만족성 등이 포함되는 복합적인 개념이며, 사용성 평가에 영향을 주는 요인은 다양하다고 할 수 있다. 본 연구에서는 제품의 사용성을 평가할 때 영향을 미치는 여러 요인 중 평가자의 내적 요인, 그 중에서도 평가자의 정서를 관심 변인으로 하여, 점화에 의해 유도된 정서가 제품의 사용성에 미치는 영향을 알아보고자 하였다. 실험 1에서는 IAPS에서 추출된 사진 자극을 점화자극으로 제시하여 참가자들에게 긍정적이거나 부정적인 정서를 유발하도록 하였다. 실험 결과, 긍정적 정서로 유도된 집단은 부정적 정서로 유도된 집단에 비해 지각된 사용성을 더 높게 평정하였다. 실험 2에서는 이미지 자극의 정서를 긍정-부정 차원과 각성-이완의 차원으로 세분화하여 제시함으로써 정서의 두 가지 차원 중 어느 차원이 지각된 사용성에 영향을 주는지 살펴보았다. 실험 결과, 각 변인들 간의 주효과와 상호작용 효과가 관찰되었다. 따라서 일시적으로 유도된 정서가 사용성 평가에 영향을 줄 수 있는 요인 중 하나임을 시사한다. 본 연구는 사용성 관련 의사결정을 필요로 하는 상황에서 평가자는 현재의 정서가 미치는 영향을 비중 있게 고려해야 한다는 함의를 제공한다.

On cold start operation of an SI engine, a catalyst shows poor performance before it reaches activation temperature. Therefore, fast warmup of the catalyst is very crucial to reduce harmful emissions. In this study, an appropriate control strategy is investigated to increase exhaust gas temperature through changes of spark timing. Combustion stability is also considered at the same time. Exhaust gas temperature and pressure of combustion chamber are measured to investigate the effects of spark timings on cold start and idle performance. Experiments showed that retarded spark timing promotes the combustion at the end of expansion stroke and increases exhaust gas temperature during cold start.

In a bi-fuel engine using gasoline and LPG fuel, with the current ignition timing for gasoline being used, the optimum performance could not be taken in LPG fuel supply mode. The ignition timing in LPG fuel mode must be advanced much more than that of gasoline mode for the compensation of its higher ignition temperature. The purpose of this study is to investigate how the ignition spark timing conversion influences the engine performance of LPG/Gasoline Bi-Fuel engine. In order to investigate the engine performance during combustion, engine performance are sampled by data acquisition system, for example cylinder pressure, pressure rise rate and heat release rate, while change of the rpm(1500, 2000, 2500) and the ignition timing advance(5°, 10°, 15°, 20°). As the result, between 1500rpm, 2000rpm and 2500rpm, the cylinder pressure and pressure rise rate was increased when the spark ignition was advanced but pressure rise rate at 20° was smaller value.

본 연구의 목적은 한국인 중학생을 대상으로 통사 점화를 통한 여격 구문 습득 과정에서 구문 유형(PO vs. DO)과 동사 유형(Same verb vs. Different verb)이 어떠한 영향을 미치는지 이해도 측면에서 살펴보는 것이다. 총 61명의 실험 참여자들은 구문 유형과 동사 유형에 따라 임의로 네 개의 실험 집단(POS, POD, DOS, DOD)으로 배정되었다. 실험 결과, DO 구조의 사후 이해도는 구문 유형(PO vs. DO)에 따라서만 통계적으로 유의미한 효과가 나타났으며, DOD 집단과 POD 집단의 평균 점수에서 통계적으로 유의미한 차이가 있는 것으로 나타났다. 그러나 동사 유형은 여 격 구문의 이해도에 유의미한 효과 차이를 가져오지 못하였고 구문 유형과 동사 유형의 상호작용 효과 역시 나타나지 않았다. 집단 내 사전-사후 검사 결과를 대조한 결과, DOD 집단의 DO 구조에 서만 통계적으로 유의미한 차이가 있는 것으로 나타났으며 효과 크기 역시 큰 것으로 나타났다 (d=0.75). 이 결과는 통사 점화가 암시적 학습의 형태로 L2 학습에 인지적 기능을 수행하며 L2 학 습 상황에서 복잡한 통사 구조의 학습에 긍정적인 영향을 미칠 수 있음을 시사한다.

최근 3차원 분야의 지속적인 발전으로 인해 보다 사실적이고 실감나는 영상을 경험할 수 있게 되었고 게임과 같은 다양한 응용분야에서 활용가능하게 되었다. 특히 가상환경에서의 객체들과 상호작용하며 이를 제어하는 증강현실 분야에 많은 발전을 가져왔다. 본 연구는 한 대의 카메라를 활용한 가상 양시점화 방법을 통해 3차원 공간의 객체를 제어하는 3차원 사용자 인터페이스를 제안한다. 이를 위해 임의의 두 카메라 위치 사이의 변환 정보를 담고 있는 호모그래피(homography) 행렬을 계산하고, 한 대의 카메라에서 얻은 2차원 손 좌표, 호모그래피 행렬 그리고 카메라의 투영행렬을 이용하여 3차원 좌표의 복원을 수행한다. 이러한 방법을 통해 보다 정확하고 빠른 3차원 정보를 얻을 수 있게 된다. 이는 두 대의 카메라를 동시에 구동할 때보다 연산량이 감소하여 실시간 처리에 효과적일 수 있으며 경제적인 부담도 줄일 수 있는 장점을 가지고 있다.