인발법 및 직접압출법을 이용한 유리섬유 강화복합재의 관한 연구

박도형(Do Hyung Park),정현석(Hyun Seok Jung),나규동(Gyu Dong Na),김민기(Min Ki Kim),김기영(Ki-Young Kim) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5

상부 조기 위암의 수술적 치료: 복강경 근위부 위 절제술

박도중 ( Do Joong Park ),박영석 ( Young Suk Park ),안상훈 ( Sang-hoon Ahn ),김형호 ( Hyung-ho Kim ) 대한소화기학회 2017 대한소화기학회지 Vol.70 No.3

Recently, the incidence of upper third gastric cancer has increased, and with it the number of endoscopic submucosal dissection (ESD) procedures performed has been increasing. However, if ESD is not indicated or non-curable, surgical treatment may be necessary. In the case of lower third gastric cancer, it is possible to preserve the upper part of the stomach; however, in the case of upper third gastric cancer, total gastrectomy is still the standard treatment option, regardless of the stage. This is due to the complications associated with upper third gastric cancer, such as gastroesophageal reflux after proximal gastrectomy rather than oncologic problems. Recently, the introduction of the double tract reconstruction method after proximal gastrectomy has become one of the surgical treatment methods for upper third early gastric cancer. However, since there has not been a prospective comparative study evaluating its efficacy, the ongoing multicenter prospective randomized controlled trial (KLASS-05) comparing laparoscopic proximal gastrectomy with double tract reconstruction and laparoscopic total gastrectomy is expected to be important for determining the future of treatment of upper third early gastric cancer. (Korean J Gastroenterol 2017;70:134-140)

논문 : IP-TV서비스를 위한 IP-TV Set-Top Box설계와 구현

박형도 ( Hyung Do Park ),오영호 ( Young Ho Oh ),이경원 ( Kyoung Won Lee ),김세영 ( Se Young Kim ),안창원 ( Chang Won Ahn ),김대진 ( Dae Jin Kim ) 전남대학교 전자통신기술연구소 2006 전자통신기술논문지 Vol.9 No.1

본 논문에서는 IP-TV 보급을 위해서 고성능 저가의 IP-TV(Internet Protocol TV) 셋탑박스의 필요성을 감안하여 TV를 통한 인터넷 컨텐츠 이용에 최적화된 IP-TV 셋탑박스를 제조업체(Ninelanes)와 공동으로 개발하였다. 개발된 셋탑박스는 브로드밴드를 이용한 VOD서비스, 1Mbps급의 DVD급 화질을 지원하고 스트리밍 비디오와 저장된 콘텐츠를 직접 재생할 수 있다. 개발된 셋탑박스는 VHS(450kbps), DVD급 (750Kbps), DVD(1.2Mbps), MP3, AC3, MPEG-2/4, VP4/5/6, WMV9, DVIX 등의 다양한 디지털 미디어 재생 포맷을 지원 할 수 있도록 개발되어 가격경쟁력 향상 및 멀티미디어 지원환경 구축, 인코더방식의 코텍 전환이 가능하다. 또한 고집적, 저전력, 고성능, 저가형 개발 개념으로 개발된 이 셋탑박스는 각종 IP-TV기능을 펌웨어나 소프트웨어 수정으로 시스템 변경이 가능하여 IP-TV 셋탑박스 보급에 크게 기여할 것으로 기대된다.

여행자 관심 기반 스마트 여행 수요 예측 모형 개발: 웹검색 트래픽 정보를 중심으로

박도형 ( Park Do-hyung ) 한국정보시스템학회 2017 情報시스템硏究 Vol.26 No.3

Purpose Recently, there has been an increase in attempts to analyze social phenomena, consumption trends, and consumption behavior through a vast amount of customer data such as web search traffic information and social buzz information in various fields such as flu prediction and real estate price prediction. Internet portal service providers such as google and naver are disclosing web search traffic information of online users as services such as google trends and naver trends. Academic and industry are paying attention to research on information search behavior and utilization of online users based on the web search traffic information. Although there are many studies predicting social phenomena, consumption trends, political polls, etc. based on web search traffic information, it is hard to find the research to explain and predict tourism demand and establish tourism policy using it. In this study, we try to use web search traffic information to explain the tourism demand for major cities in Gangwon-do, the representative tourist area in Korea, and to develop a nowcasting model for the demand. Design/methodology/approach In the first step, the literature review on travel demand and web search traffic was conducted in parallel in two directions. In the second stage, we conducted a qualitative research to confirm the information retrieval behavior of the traveler. In the next step, we extracted the representative tourist cities of Gangwon-do and confirmed which keywords were used for the search. In the fourth step, we collected tourist demand data to be used as a dependent variable and collected web search traffic information of each keyword to be used as an independent variable. In the fifth step, we set up a time series benchmark model, and added the web search traffic information to this model to confirm whether the prediction model improved. In the last stage, we analyze the prediction models that are finally selected as optimal and confirm whether the influence of the keywords on the prediction of travel demand. Findings This study has developed a tourism demand forecasting model of Gangwon-do, a representative tourist destination in Korea, by expanding and applying web search traffic information to tourism demand forecasting. We compared the existing time series model with the benchmarking model and confirmed the superiority of the proposed model. In addition, this study also confirms that web search traffic information has a positive correlation with travel demand and precedes it by one or two months, thereby asserting its suitability as a prediction model. Furthermore, by deriving search keywords that have a significant effect on tourism demand forecast for each city, representative characteristics of each region can be selected.

압축비 조절기구가 부착된 단기통 디젤엔진에 대한 BDF의 적용

박형도 ( Hyung Do Park ),양협 ( Hyup Yang ) 대한설비관리학회 2009 대한설비관리학회지 Vol.14 No.2

An experimental study on engine performance parameters and emission gas characteristics for bio-diesel fuels (BDF`s) was performed by using of a specific engine; the type of single-cylinder, four-stroke, water-cooled diesel engine with variable compression ratio adjustment mechanism (the model Farryman A 30 marine, TQ, UK). Specific fuel consumptions (SFC) and soot tendency (smoke %) for various fuel and/or operation conditions were also examined. The BDF`s used were prepared BD 20 and BD 100 together with the commercial diesel fuel (DF) for reference. The established conditions for experiment were 12:1, 14:1, 16:1 and 18:1 for compression ratio (CR), and 1000, 1500, 2000 and 2500 rpm for engine speed. It was found that SFC of BDF`s is increased 1.3~3.7% compared with DF according to the rpm`s; for the smoke %, BDF`s value is reduced significantly up to max. 45.7 % in comparison to that of DF; and while NOx is increased amazingly up to max. 38%, which is too much than the previous results of around 12.0 %. Also, it does not seem that the engine`s power output remains changed significantly according to the fuels used.

규범적 기대와 예언적 기대가 소비자 만족에 미치는 영향

박도형(Do-Hyung Park),이동원(Dongwon Lee),정재권(Jaekwon Chung) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.7

제품이나 서비스에 대한 소비자 만족은 이성적인 관점에서 어느 정도 성과를 창출하였는지와 감정적인 관점에서 어떤 느낌을 제공하는지에 따라 달라진다. 본 연구는 소비자의 이러한 두 가지 차원의 기대를 이성적 기대와 감성적 기대의 독립적인 기대들로 간주하고, 특정 제품이나 서비스에 대한 소비자 만족간의 관계를 확인하였다. 동시에 기존의 기대불일치 이론을 확장한 예언적 기대와 규범적 기대도 함께 고려하여, 소비자의 이성적인 판단과 감정적인 느낌의 기대불일치가 만족 에 어떤 영향을 미치는지 연구하였다. 연구 결과, 이성적인 관점에서는 소비자의 기대를 뛰어넘는 성능이나 경험을 했을 경 우, 만족은 증가함을 알 수 있었고, 이 효과는 예언적 기대를 충족했을 때 더 커짐을 알 수 있었다. 반면, 감성적인 관점에서는 소비자가 규범적으로 사전에 기대한 느낌보다 더 좋은 느낌을 얻을수록, 만족이 증가하지만, 자신이 실제로 일어날 것이라고 예언한 기대에 불일치하는 것은 오히려 만족을 감소시킨다는 결과를 확인하였다. 하지만 영향정도의 절대 크기 측면에서 감정적인 느낌 하에서는 규범적 기대불일치가 소비자의 만족에 미치는 영향이 예언적 기대불일치의 영향보다 더 크다는 것 을 확인하였다. Consumer expectation is divided into rational and emotional components with regard to the experience of products or services. The purpose of this study is to investigate the relationship between these two types of expectations and consumer satisfaction. For the theoretical framework, we use the dual expectation theory with respect to the should-expectation and will-expectation, and verify their effects on consumer satisfaction. The findings of this study imply that under rational expectation, consumer satisfaction increases when the result of their experience exceeds their expectation and the impact is stronger when the will-expectation is satisfied. Under emotional expectation, consumer satisfaction increases when the should-expectation exceeds the result of the actual performance, but decreases when there is disaccord between the will-expectation and performance. For emotional-based expectation, the impact on consumer satisfaction is stronger for should-expectancy disconfirmation than for will-expectancy disconfirmation.

IP-TV서비스를 위한 IP-TV Set-Top Box설계와 구현

박형도 ( Hyung Do Park ),이경원 ( Kyoung Won Lee ),안창원 ( Chang Won Ahn ),김대진 ( Dae Jin Kim ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.2

본 논문에서는 IP-TV 보급을 위해서 고성능 저가의 IP-TV(Internet Protocol TV) 셋탑박스의 필요성을 감안하여 TV를 통한 인터넷 컨텐츠 이용에 최적화된 IP-TV 셋탑박스를 제조업체(Ninelanes)와 공동으로 개발하였다. 개발된 셋탑박스는 브로드밴드를 이용한 VOD서비스, 1Mbps급의 DVD급 화질을 지원하고 스트리밍 비디오와 저장된 콘텐츠를 직접 재생할 수 있다. 개발된 셋탑박스는 VHS(450kbps), DVD급(750Kbps), DVD(1.2Mbps), MP3, AC3, MPEG-2/4, VP4/5/6, WMV9, DVIX 등의 다양한 디지털 미디어 재생 포맷을 지원 할 수 있도록 개발되어 가격경쟁력 향상 및 멀티미디어 지원환경 구축, 인코더방식의 코덱 전환이 가능하다. 또한 고집적, 저전력, 고성능, 저가형 개발 개념으로 개발된 이 셋탑박스는 각종 IP-TV기능을 펌웨어나 소프트웨어 수정으로 시스템 변경이 가능하여 IP-TV 셋탑박스 보급에 크게 기여할 것으로 기대된다.

소비자의 규범적 기대와 예언적 기대가 소비자의 만족에 미치는 영향

박도형(Park, Do-Hyung),정재권(Chung, Jaekwon) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.12

소비자 만족은 제품이나 서비스의 판매 등의 기업의 성과에 중요한 영향을 미칠 뿐만 아니라 구전을 일으키고 더 나아가서 고객 충성도를 향상시킨다. 기존의 소비자 만족 연구는 기대불일치 이론을 중심으로 소비자의 기대, 지각된 성능, 이에 따른 기대불일치 정도가 만족에 미치는 영향을 확인하고 있다. 본 연구는 소비자의 기대를 해당 제품이나 서비스의 성능이 “어느 정도는 되어야 한다” 는 규범적 기대와 “어느 정도는 될 것이다” 의 예언적 기대로 구분하여 조절초점 이론에서 제안하는 소비자의 성향 (향상초점 vs. 예방초점) 에 따라 어떤 기대불일치가 만족에 더 큰 영향을 미치는지 확인하고 있다. 구체적으로 향상초점 성향이 강한 소비자는 규범적 기대 불일치보다는 예언적 기대 불일치가 만족에 미치는 영향이 더 크고, 예방초점 성향이 강한 소비자는 예언적 기대 불일치보다는 규범적 기대 불일치가 만족에 미치는 영향이 더 크다는 것이 밝혀 졌다. 본 연구는 일반적인 기대 (예언적 기대) 뿐만 아니라 규범적 기대의 중요성을 실증적으로 밝힌 점과 기대불일치 하에서 조절초점의 조절 역할을 밝힌 점에서 이론적인 공헌을 가지며, 고객들의 기대 관리 전략을 수립할 수 있는 가이드를 제공한 다는 측면에서 실무적인 시사점을 가진다. It is widely known that consumer satisfaction, as well as consumer voice and loyalty, affect firms’ performance. Prior studies on consumer satisfaction have focused on expectancy disconfirmation theory and its effects on satisfaction related to disconfirmation with consumer expectation and with perceived performance. This study classified consumer expectation into should-expectation and will-expectation, and investigated how disconfirmation with these expectations affects consumer satisfaction differently based on regulatory focus. Specifically, for promotion-focused consumers, disconfirmation of will-expectation has a more significant influence on consumer satisfaction than that of should-expectation. For prevention-focused consumers, disconfirmation of should-expectation has a more significant influence on consumer satisfaction. The results of this study provide academic insights that not only generic expectation (will-expectation) but also should-expectation play an important role in determining consumer satisfaction according to regulatory focus. In addition, it is expected that the findings can be used as a guide to manage consumer expectation in practice.

외상후 복부 다발성 고형장기 손상

박형도 ( Hyung Do Park ),김선휴 ( Sun Hyu Kim ),이종화 ( Jong Hwa Lee ),홍정석 ( Jung Seok Hong ),홍은석 ( Eun Seog Hong ) 대한외상학회 2009 大韓外傷學會誌 Vol.22 No.2

Purpose: This study evaluated the characteristics and the prognosis of multiple intraabdominal solid organ injuries, including those to the liver, spleen, and kidney, after blunt trauma. Methods: From January 2001 to March 2009, 39 patients with multiple intraabdominal solid organ injuries, which had been confirmed by contrast-enhanced computed tomography after blunt trauma, were included in this retrospective study. The injury severity score (ISS), abbreviated injury scale (AIS), revised trauma score (RTS), American Association for the Surgery of Trauma (AAST) injury grade of solid organs, initial hemodynamic status, blood gas analysis, blood transfusion, and the mortality were the main outcome measurements. Results: Injured groups were classified into liver/kidney (n=17), liver/spleen (n=4), spleen/kidney (n=13), and liver/kidney/spleen (n=5) groups. Patients were older in the liver/kidney group than in the liver/kidney/spleen group (43 vs 18 years, p=0.023). The initial systolic blood pressures tended to be lower in the liver/kidney group than in the other groups (84 vs 105, 112, and 114 mmHg, p=0.087). The amounts of 24-hour packed RBC transfusion were 32 units in the liver/kidney group and 4 units in the liver/kidney/spleen group, but the difference was not statistically significant. Differences were found in neither the RTS, ISS, and AIS for head, chest, abdominal, and pelvic injuries nor the AAST injury grade for solid organ, but injuries to the chest were more severe in the liver/spleen group than in the spleen/kidney group (AIS 4.0 vs 2.8, p=0.028). Conservative treatment was the most frequent applied treatment in all groups. There were 6 mortalities: 3 due to hypovolemia, 2 to sepsis, and 1 to brain injury. Mortalities occurred only in the liver/kidney group. Conclusion: Patients who had intraabdominal solid organ injuries of the liver and the kidney simultaneously, tended to be transfused more at an early time after trauma, to have lower initial systolic blood pressures, and to have a higher mortality. (J Korean Soc Traumatol 2009;22:193-8)

딥러닝 기반 영상 정합 기술의 연구 동향

송대영(Dae-Young Song),이희경(Heekyung Lee),엄기문(Gi-Mun Um),서정일(Jeongil Seo),조동현(Donghyeon Cho) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.11