統計的 에너지 解析을 利用한 板構造의 振動減衰 硏究

구성완 忠南大學校 大學院 2003 국내석사

The vibration of low frequency in a missile structure cause a flight instability and the energy of high frequency damages the structure. In flight, the load in kind of shocks causes the both phenomena concurrently. So the methods for reducing the vibration in a wide range is inevitable. This paper investigate the effect of fastening, the rubber treatment with plates in a connected structure. The result is summarized as fellows 1) The reducing of joining fasteners does not have influence on the increase of damping. 2) In case of rubber treatment only, the effect of damping increase is negligible. The result shows only the effect of mass increase. Its effect of damping shows over the range of 1 kHz 3) In case of additional attachment of aluminum plates, no difference is identified. But when the shape of plate attachment is coincident to the mode shape, then damping ratio increase drastically. This damping treatment is effective over the range of 300Hz. But below 300 Hz, the damping effect decrease below, careful attention should be payed for a applications. From those results, the passive treatment like the rubber or plate treatment for the reduction of the vibrations is not effective and active treatment should be considered for this purpose. In addition to the above statement, using a modal and ESEA test are supplemental each others in a treatable range of frequency. It can be used for the study of vibrations in a wide range of frequencies.

초음파 분무 열분해법을 이용한 헥사알루미네이트의 특성

구성완 漢陽大學校 大學院 1999 국내석사

연소기의 연소효과를 높이기 위해 각광을 받는 촉매반응기는 고온에서 촉매가 소결되어 비표면적이 줄어든다는 단점이 있다. 그러므로 고온에서 비교적 안정한 촉매인 헥사알루미네이트가 연구되어졌는데, 고온에서의 소결을 막을 수 없었다. 그러므로 본 연구에서는 고온에서 높은 비표면적을 유지할 수 있도록 헥사알루미네이트 촉매를 USP법으로 제조하여 증발건조법으로 제조한 촉매와 그 특성을 비교하여 살펴보았다. 입자의 크기는 USP법으로 제조한 촉매가 1200 ℃에서도 저온에서의 입자크기를 일정하게 유지하고 크기도 더 작다. 비표면적은 1200 ℃에서 5시간 소결시켰을 때, 11.5 m2․g-1로, 증발건조법으로 제조한 촉매의 비표면적인 6.5 m2․g-1 보다 두배 정도 높았다. 시간에 따른 온도안정성을 살펴보기 위해 30시간 동안 촉매를 1200 ℃로 소결시켰는데, 11 m2․g-1 정도 내외의 값으로 잘 유지한다. 메탄 연소 활성은 같은 온도에서 USP법으로 제조한 촉매를 사용했을 때 증발건조법으로 제조한 촉매보다 더 높은 메탄 전화율을 보인다. 또한 USP법으로 촉매를 제조할 때 증발건조법으로 제조할 때 보다 사용된 전력량과 제조시간이 적게 걸려 제조 비용 절감 효과가 크다.

요부 굴곡근과 신전근 강화운동이 만성요통환자의 체력요인과 주관적 통증에 미치는 영향

구성완 群山大學校 大學院 2004 국내석사

The purpose of this study was to prove the influence of flexor & extensorstrengthening exercise on the physical strength factor(strength, flexibility, balance) & visual analogue scale in chronic low back pain patients. Following approval by the boardman of neurosurgery, thirty Low-back pains were divided into two groups : The fifteen were in the flexor & extensor strengthening exercise plus physical therapy group and the others were in the physical therapy group. All subjects were performed with the flexor & extensor strengthening exercise and the physical therapy for at least 8 weeks. Experimental data were analysed by statistical method t-test and Post-Hoc was used for Duncan All statistical test in this study were conducted at the .05 level of significance. The result of the experimental process is as follow; 1. Back strength flexor & extensor strengthening exercise group and physical therapy group(t=61.626, p=0.000) significant differences on main effect. 2. flexibility flexor & extensor strengthening exercise group and physical therapy group(t=44.534, p=0.000) significant differences on main effect. 3. balance flexor & extensor strengthening exercise group and physical therapy group(t=60.692, p=0.000) significant differences on main effect. 4. The visual analogue scale of both group was decreased significantly. As the above results the flexor & extensor strengthening exercise program & physical therapy for chronic low back pain patients can tell on the remedy method. Therefore, it is necessary to apply flexor & extensor strengthening exercise program in other to prevent with physical strength factor(strength, flexibility, balance) & visual analogue scale in chronic low back pain patients.

하이브리드 굴삭기의 동력 분배 제어에 관한 연구

구성완 창원대학교 2010 국내석사

Prepare for the depletion of fossil fuel, the automotive industry is actively conducting research into the HEV(Hybrid Electric Vehicle). Technical development of the construction equipment including excavator, which uses the fossil fuel as a main source of energy, is also going on progress to improve the fuel efficiency. Especially the research of hybrid system is in the limelight of the excavator industries. While HEV is developed, the technique of Hybrid was possessed already. However operating characteristics of excavator are different from the car. Therefore, it is necessary to develop the control algorithm for the hybrid excavator. This study proposes the power management control algorithm for hybrid excavator. And propriety is verified by experiment using a test bench, including a super-capacitor module, that imitates the power system of hybrid excavator.

Performance of Double Binary Turbo Coding for Visible Light Communication Systems

구성완 광운대학교 대학원 2010 국내석사

As increasing demand for high performance next generation communication systems, the improved wireless communication techniques are developing variously to transmit at longer distances and higher data rates. Wireless communication systems using visible light are at the forefront of possible the next generation wireless communication systems because visible light communication systems are based on using radiated Light Emitting Diode (LED) light. It has many good merits, for example, there are the only visible light communication that works information and illumination at the same time, the possibility of transmitting information in broadband, higher security, it does not harm human beings, it cannot cross Radio Frequency (RF) bands and there is no frequency permission and fee needed. However, visible light communication using LED light has some weaknesses which is to deteriorate the performance of communication. To reduce information losses caused by optical noise, such as incandescent lamps, fluorescent lamps, and sunlight, I propose channel coding scheme. In this paper, binary turbo codes and double binary turbo codes are used as channel coding scheme. Log MAP and Max-log MAP algorithm and SOVA are used in decoding part. Encoding and decoding of the proposed system is described and simulation results are analyzed. As the results simulated, if turbo codes are applied to communication system, performance is improved.

모바일 인터넷 사용의도에 관한 연구

구성완 연세대학교 정보대학원 2008 국내석사

가입자의 포화로 매출의 정체라는 난제에 직면하고 있는 국내의 이동통신 사업자들은 기존의 음성통화 매출을 대체할 시장으로 모바일 인터넷 시장에 주목하고 있다. 이러한 상황에서 3세대 이동통신 기술인 WCDMA의 상용화는 국내 이동통신 사업자에게 중요한 의미가 될 것으로 기대되고 있다. 3세대 이동통신 기술의 도입으로 모바일 인터넷 시장의 활성화를 통해 매출과 수익의 정체를 극복할 새로운 기회를 갖게 된 것이다.본 논문은 모바일 인터넷의 사용의도에 영향을 미치는 요인에 대해 검증함으로써, 모바일 인터넷 시장의 활성화를 통해 매출과 수익의 정체를 극복하고자 하는 이동통신 사업자에 시사점을 제공하고자 한다.이러한 목적에 따라 본 논문은 DeLone과 McLean의 Updated Information System Success Model(2003)에 기초하여 모바일 인터넷의 정보 품질, 시스템 품질, 서비스 품질 등의 만족도가 모바일 인터넷의 사용의도에 미치는 영향에 대하여 검증하였다. 또한 정보 시스템은 물론 유선 인터넷과는 상이한 모바일 인터넷만의 독특한 특성을 감안하여 이들 3가지 요인들 외에 요금 특성, 보안성, 통신 기술 특성 등의 3가지 요인들을 추가로 독립변수로 설정하여 모바일 인터넷의 사용의도에 미치는 영향에 대하여 검증하였다.본 연구의 결과, 기존의 선행 연구를 통해 모바일 인터넷의 사용의도에 영향을 미치는 요인으로 검증되었던 정보 품질, 시스템 품질, 서비스 품질 등의 요소중 정보 품질과 시스템 품질의 만족도는 모바일 인터넷의 사용의도에 유의한 영향을 미치는 반면, 서비스 품질의 만족도는 유의한 영향을 미치지 못하는 것으로 검증이 되었다.또한 기존의 연구에서는 중요하게 다루어지지 않은 요금 특성, 보안성, 통신 기술 특성 등의 요인은 모바일 인터넷의 사용 의도에 매우 유의한 영향을 미치는 것으로 검증되었다.이러한 연구 결과는 모바일 인터넷의 사용 증대를 위해 정보(콘텐츠)의 품질이나 시스템(네트워크)의 품질 향상에 집중하여 막대한 인력과 예산을 투입하고 있는 국내 이동통신사업자의 향후 사업 전략 수립에 매우 중요한 시사점을 제공할 것으로 기대된다.한편 본 연구 결과에 따라 모바일 인터넷의 사용의도에 유의한 영향을 미치는 것으로 검증된 요인들의 어떤 세부 요소들이 모바일 인터넷의 사용의도에 어떻게 구체적으로 영향을 미치는지에 대한 부분은 향후 추가 연구가 필요할 것이다. Korean mobile carriers who are confronting stagnation of sales due to the saturation of subscribers are paying attention to the mobile internet market which will replace the existing voice telecommunication sales. Under this situation, the commercialization of WCDMA in 2007, which is the 3rd generation of mobile telecommunication technology, is expected to be of great significance to the korean mobile carriers. By the introduction of the 3rd generation mobile telecommunication technology, they were able to have new chance to overcome the stagnation of sales and earnings through revitalization of mobile internet market.By verifying factors influencing subscribers' intention to use the mobile internet, this paper intends to provide suggestions to the mobile carriers who are trying to overcome the stagnation of sales and earnings through revitalization of mobile internet market.Under this purpose, this paper verifies influence of the satisfaction of Information Quality, System Quality and Service Quality on intention to use the mobile internet based on the Updated Information System Success Model(2003) by DeLone and McLean. Also, considering unique characteristics of mobile internet which is different from information system and wired internet, this paper verifies influence on the intention to use the mobile internet by establishing three factors(Service fee characteristics, Security characteristics, Telecommunication technology characteristics) as the additional independent variables. As a result of the research, among the factors - the satisfaction of Information Quality, System Quality and Service Quality - known as to affect to the intention to use the mobile internet through the prior research, the satisfaction of Information Quality and System Quality were verified as to have significant influence on the Intention to use while the satisfaction of Service Quality were verified as not to.Also, the factors such as Service fee characteristics, Security characteristics, Telecommunication technology characteristics etc. were verified as to have most significant influence on the Intention to use the mobile internet, which were not handled with care. The result of the study is expected to provide very important implications on the future business strategy of korean mobile carriers who are investing enormous human resources and costs focusing on the improvement of quality of information(contents) and system(network) in order to increase the use of mobile internet.On the other hand, additional future study will be necessary as to how specifically the factors, which were verified to have significant influence on the intention to use the mobile internet as the result of this study, have concretely influence on the Intention to use the mobile internet.

CAI 敎授-學習 模型 開發

구성완 公州大學校 敎育大學院 1994 국내석사

To improve the effectiveness of learning, we should individualize learners after paying due regard to their learning ability in process of teaching. If we use CAI Learning program effectively, we can individualize learners through the program, because we can advance learners' concentration and interest on studying. In this study, three types were developed - Individual Learning Type, Teacher and Learner Simultaneous Learning Type and Individul Learning Type after Teaching - on the model of CAI Teaching and Learing Model. As a result of the application of diese types, the effect was produced like these ; 1. Individual Learing Type : This type 6tts first class because it natually derived curiosity from learners. 2. Teacher & Learner Simultaneous Type : This type fitts third class, because it is progressed step dy step. 3. Individual Learing Type after Teaching : This type fitts every class. But Learners should closely analyze unit and program before learnig.