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알루미늄 다공성소재를 이용한 RFID Tag용 열차폐부품 개발
방제오,이효수,정택균,이민하,김범성,정승부,Bang, Jae-Oh,Lee, Hyo-Soo,Jung, Taek-Kyun,Lee, Min-Ha,Kim, Bum-Sung,Jung, Seung-Boo 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2
The RFID (Radio-Frequency Identification) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. Some RFID tags have been used in severe environment of temperature ranged from $200^{\circ}C$ to $250^{\circ}C$ for a long time and may cause serious problems such as signal error, short life cycle and explosion. Conventionally, the RFID tags for high temperature applications consisted of Fe-alloy housing part, ceramic powder and RFID sensor. However, it has disadvantage of heavy weight, signal noise and heat shield capability. In this study, we newly applied the aluminum porous materials fabricated by polymer leaching process into RFID tags in order to improve heat shielding ability, and compared the properties of RFID tag inserted by aluminum porous with the conventional one.
이중추출법에서 일반화 ratio-cum-product 방법을 이용한 이상점 가중치 보정법
오정택,신기일,Oh, Jung-Taek,Shin, Key-Il 한국통계학회 2016 응용통계연구 Vol.29 No.7
이중추출법은 모집단 정보가 충분하지 않아 층화 추출법을 사용할 때 정확한 층화 정보가 없는 경우에 흔히 사용하는 표본추출법이다. 특히 최근에는 이중추출법을 위해 1차 조사에서 얻어진 보조 정보를 이용하여 추정의 정확성을 향상시키는 방법들이 제안되었다. 본 연구에서는 최근 제안된 일반화 ratio-cum-product 추정량에서 사용하는 가중치를 이상점 처리를 위한 가중치 보정에 맞도록 보정하여 추정의 정밀성을 향상시키는 방법을 제안하였다. 모의실험을 통하여 본 연구에서 제안한 방법과 기존의 이상점 가중치 보정법의 성능을 비교하였으며 사례 분석을 통하여 제안된 방법의 우수성을 확인하였다. Two phase sampling (double sampling) is often used when there is inadequate population information for proper stratification. Many recent papers have been devoted to the estimation method to improve the precision of the estimator using first phase information. In this study we suggested outlier weight adjustment methods to improve estimation precision based on the weight of the generalized ratio-cum-product estimator. Small simulation studies are conducted to compare the suggested methods and the usual method. Real data analysis is also performed.
박정택 ( Jung Taek Park ),최세민 ( Se Min Choi ),오영민 ( Young Min Oh ),오주석 ( Joo Suk Oh ),경연영 ( Yeon Young Kyoung ),조항주 ( Hang Joo Cho ),최경호 ( Kyoung Ho Choi ) 대한임상독성학회 2010 대한임상독성학회지 Vol.8 No.2
Purpose: Although cardiac toxicity is a key parameter of significant toxicity, in antidepressant intoxication, there are few studies on the cardiac toxicity of serotonin reuptake inhibitor and the intoxication with the new generation of antidepressants. The aim of this study is to investigate the relative cardiac toxicity of serotonin reuptake inhibitor and intoxication with the new generation of antidepressants as compared with that of tricyclic antidepressant intoxication. Methods: We retrospectively reviewed the medical records of 109 antidepressant intoxicated patients who visited the Emergency Department from January, 2005 to December, 2009 to collect and analyze the demographic and clinical data. Sixteen patients were excluded. The enrolled seventy eight patients were classified into three groups: the tricyclic antidepressant group (TCA) (n=32), the selective serotonin reuptake inhibitor subgroup (SSRI) (n=28) and the new generation antidepressant subgroup (NGA) (n=18). Results: The demographic and clinical data of the SSRI and NGA groups were not significantly different from that of the TCA group. The QRS duration of the SSRI subgroup (86.4±12.0 msec) and the NGA subgroup (91.8±11.9 msec) was not significantly different from that of the TCA group (90.0±13.5msec) (p=0.598). The QTc interval of the SSRI group (444.5±33.5msec) and the NGA group (434.9±35.9) (p=0.260) were not significantly different from that of the TCA group (431.2±44.1msec) (p=0.287). Conclusion: Intoxication with SSRI and the new generation antidepressants seemed to show significant cardiac toxicity, like what is seen in tricyclic antidepressant intoxication. Clinicians must pay attention to SSRI and new generation antidepressant intoxication.
고단차 불연속 형상의 3차원 측정을 위한 이중파장 위상천이 영사식 무아레
김승우,오정택,정문식,최이배,Kim, Seung-Woo,Oh, Jung-Taek,Jung, Moon-Sik,Choi, Yi-Bae 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
[$Moir\acute{e}$] technique is now being extensively investigated as a fast non-contact means of three-dimensional profile measurement especially for reverse engineering. One problem with $moir\acute{e}$ technique is so called $2\pi$-ambiguity problem that limits the maximum step height difference between two neighboring sampling points to be less than half the equivalent wavelength of $moir\acute{e}$ fringes. In this investigation, a new two-wavelength scheme of projection $moir\acute{e}$ topography is proposed and tested to cope with the $2\pi$-ambiguity problem. Experimental results are discussed to assess the new method in measuring large objects with high step discontinuities.
조향정,오정택,김강득,김헌수,Jo, Hyang-Jeong,Oh, Jung-Taek,Kim, Gang-Deuk,Kim, Hun-Soo 대한세포병리학회 2007 대한세포병리학회지 Vol.18 No.2
A case of Burkitt lymphoma diagnosed through fine needle aspiration cytology is described, A 66-year-old man presented with lymphadenopathy on the right cervical neck and axillary area. An ultrasonogram and CT scan for the cervical neck showed a multiple variable sized lymphadenopathy with pericapsular invasion and necrotic foci, Fine needle aspiration cytology (FNAC) of the cervical lymph nodes revealed very cellular and necrotic smears consisting of diffusely scattered intermediate monotonous round cells, tingible body macrophages and many mitotic figures. Histological features of the excised lymph nodes showed the classic morphological features of Burkitt lymphoma. Recognition of the characteristic cytological features can suggest the possibility of Burkitt lymphoma.
강탑,김성철,오정택,Kang, Top,Kim, Sung-Cheol,Oh, Jung-Taek 한국시스템엔지니어링학회 2011 시스템엔지니어링학술지 Vol.7 No.1
SE generally defines approaching ways of conducting identification, verification and integration of an optimized product and process solution to meet customer's needs by leveraging organizational competency in engineering and management. To successfully develop a new product under mass production contract, it is important to efficiently carry out the program by ensuring that three major competencies are secured; core technology, system integration, and program management. For successful implementation of tasks in the three areas, systematic execution is called for, which requires identifying risk factors in advance. In particular, comprehensive risk management role and responsibility is required for program management. Success of a development program is determined by complex elements of human resources, organization culture, and overall competency of an organization in technology and program management, including capability of the program manager. In this paper, a risk management solution is suggested to lead a program to success with a more efficient way through actual risk management by the concept of SE around the above three areas.
소방구조용 호보크래프트 개발에 요구되는 기능적 사항 분석
김희중(Kim Heui Jung),오정택(Oh Jung Taek),정재현(Jung Jae Hyun) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
As the most of Hovercraft being used in the fire and rescue works are made from leisure and transportation. For the developing of Hovercraft for the Fire and Rescue, the functional requirements of the Korean environment are must be studied for the purpose of the introduction.
강동백 ( Dong Baek Kang ),오정택 ( Jung Taek Oh ),박원철 ( Won Cheol Park ),이정균 ( Jeong Kyun Lee ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.3
Anisakiasis usually occurs in the stomach and can easily be diagnosed by digestive tract endoscopy as opposed to enteric anisakiasis which is very rare and difficult to be diagnosed definitively. The most important and useful tool in diagnosing enteric anisakiasis is obtaining an accurate patient history of having eaten raw fish before the onset of symptoms. We report a case of small bowel obstruction caused by acute invasive enteric anisakiasis. A 60-year-old woman visited the emergency room suffering from sudden abdominal pain. She had eaten raw fish 1 day before the onset of symptom. Radiologic studies showed small bowel obstruction. However, no definitive cause could be found. An emergency laparotomy revealed edematous and dilated proximal jejunum and a focal stenosis of the distal jejunum. Segmental resection of the jejunum was performed, and histopathological examination revealed enteric anisakiasis. The patient was discharged on the 7th day after surgery following an uneventful course of recovery. (Korean J Gastroenterol 2010;56:192-195)