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강민규,김성동,Kang, Min-gyu,Kim, Sungdong 한국마이크로전자및패키징학회 2020 마이크로전자 및 패키징학회지 Vol.27 No.4
웨어러블 소자를 구현하기 위한 칩-섬유 접합 기술을 중심으로 전자 섬유에 대한 기술 개발 동향을 소개한다. 전자 부품을 섬유에 접합하기 위해서는 먼저 전자 부품에 전원 공급 및 전기적 신호를 주고 받기 위한 회로를 섬유에 구성해야 하며, 회로의 해상도와 밀도에 따라 전도성 실을 이용하는 자수법 또는 전도성 페이스트 등을 이용한 프린트법을 통해 구현할 수 있다. 전자 부품과 섬유를 접합하기 위해서는 솔더링, ACF/NCA, 자수법, 크림핑 등의 방법을 이용하여 영구적으로 접합하거나 후크, 자석, 지퍼 등을 이용하여 탈부착이 가능하도록 접합하는 방법이 있으며, 접합 배선의 밀도 및 용도에 따라서 단독 또는 융합하여 사용한다. 접합 이후에는 방수 등 사용환경에서의 신뢰성을 확보하기 위해 encapsulation 작업을 수행해야 하며, 현재는 PDMS 등의 폴리머를 이용한 방법이 널리 쓰이고 있다. This paper reviews the recent development of electronic textile technology, mainly focusing on chip-textile bonding. Before the chip-textile bonding, a circuit on the textile should be prepared to supply the electrical power and signal to the chip mounted on the fabrics. Either embroidery with conductive yarn or screen-printing with the conductive paste can be applied to implement the circuit on the fabrics depending on the circuit density and resolution. Next, chip-textile bonding can be performed. There are two choices for chip-textile bonding: fixed connection methods such as soldering, ACF/NCA, embroidery, crimping, and secondly removable connection methods like a hook, magnet, zipper. Following the chip-textile bonding process, the chip on the textile is generally encapsulated using PDMS to ensure reliability like water-proof.
강민규 ( Kang Min-gyu ),조광일 ( Cho Kwang-il ),정영수 ( Jeong Young-soo ),김인태 ( Kim In-tae ),안진희 ( Ahn Jin-hee ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
To ensure the safety of weathering steel structures, it is important to evaluate the time-dependent corrosion behavior. Thus, progress and effect of corrosion damage on weathering steel members should be evaluated, but predicted corrosion depth do not go far enough until now, which is affected by the corrosion environment. In this study, the corrosion resistant of weathering steel was examined to quantifiably investigate and compare the corrosion depth of carbon and weathering steel.
계량된 톨킨슨 션트 : 제4 뇌실 주변 종양에 대한 적용
강민규(Min-Gyu Kang),장창기(Chang Ki Jang),박현호(Hun Ho Park),장동수(Dong-Su Jang),이규성(Kyu-Sung Lee),홍창기(Chang-Ki Hong) 대한두개저학회 2020 대한두개저학회지 Vol.15 No.2
Background : The Torkildsen shunt is a procedure used in the 1940s and 1950s to bypass the cerebrospinal fluid flow from the lateral ventricle to the cisterna magna, before the introduction of extracranial shunts. The aim of this study was to re-evaluate and modify the Torkildsen shunt to prevent obstructive hydrocephalus in patients with 4th ventricle tumors. Methods : Fifteen patients underwent surgery for benign or malignant 4th ventricle tumors via the midline suboccipital approach from August 2010 to August 2016. Among them, eight received a modified Torkildsen shunt to prevent obstructive hydrocephalus. Permanent ventricular catheter is placed in the 4th ventricle from the obex to the cerebral aqueduct, bridging the 3th ventricle and the cervical subarachnoid space at the foramen magnum. Results : Among the eight patients who underwent tumor removal with the modified Torkildsen shunt, three had hydrocephalus preoperatively, but none had hydrocephalus postoperatively. Four patients presented preoperative hydrocephalus on control group. The rate of hydrocephalus resolution after tumor removal without ventricle shunting procedure was 25%. Three patients required external ventricular drainage before tumor removal; one patient needed ventriculo-peritoneal shunt owing to progression of hydrocephalus two-month later after the operation. No shunt-related complications or malfunction were observed over a mean follow-up period of 35 months. Conclusions : The modified Torkildsen shunt can be effective option in resolving postoperative hydrocephalus in 4th ventricle tumors. It is a simple and efficient procedure without the need for an endoscopic procedure or ventriculo-peritoneal shunt if we choose careful patient selection.
RTP/RTCP 를 이용한 영상회의 시스템에서 오디오 패킷 손실 보상을 위한 동적 부가 전송 매커니즘 개발 및 성능 분석
강민규(Kang Min Gyu),궁상환(Kung Sanghwan),김동규(Kim Dong Kyoo) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.10
This paper addresses the problem found with audio packet loss on the teleconferencing system. In ITU H.323 teleconferencing system, the RTP/RTCP protocol offered to delivery realtime stream (audio and video). Participants in teleconferencing system have experience in packet loss which results in the congestion. The quality of the audio that delivered from source to destination depends essentially on the number of lost packets and on the delay variations between successive packets. We measure the loss of audio packets in order to examine the loss characteristics over Internet. The experience has shown that almost packet loss is isolate fairly over congested network. The goal in our study is to develop efficient mechanism to adapt the loss characteristics of the networks. By examining the packet loss of audio streams sent over Internet, we suggests that Dynamic Redundant Transmission mechanism would be adquate to minimize the impact of audio packet loss. The sending sites uses the feedback information which contains into the RTCP packets, to compute packet loss. Based on this packet loss state, the sender determines the policy of redundant transmission which is one of no-redundant, 1-order redundant, and 2-order redundant. These mechanisms are implemented and evaluated over the Internet. The results indicate that the mechanism can be applied to minimize almost all the non-consecutive packet loss and a part of consecutive loss.
강민규 ( Min Gyu Kang ),김주영 ( Ju Young Kim ),방보람 ( Bo Ram Bang ),정재우 ( Jae Woo Jung ),손성욱 ( Seong Wook Sohn ),강혜련 ( Hye Ryun Kang ) 대한천식알레르기학회 2012 천식 및 알레르기 Vol.32 No.3
Background: Ciprofloxacin can induce immediate hypersensitivity reactions such as urticaria, angioedema, and anaphylaxis. These reactions are usually immunoglobulin E -mediated but non-immunoglobulin E mediated reactions were also reported. Case History: A 47-year-old man visited our emergency department with generalized erythematous rasheses. Skin rash, febrile sensations and conjunctival injection had developed 1 hour after he took ciprofloxacin and tamsulosin 5 hours ago. Initially, his blood pressure was normal but abruptly dropped to 75/36 mmHg 5 hours after arrival. His blood pressure was normalized with repeated epinephrine injection followed by hydration and norepinephrine continuous infusion. Results: Oral provocation tests were performed by using tamsulosin and ciprofloxacin. While tamsulosin did not evoke any symptoms, the patients had itching, erythematous rashes on the whole body 10 minutes after taking ciprofloxacin 62.5 mg and delayed hypotension (87/49 mmHg) occurred 5 hours later. He was diagnosed with delayed hypersensitivity to ciprofloxacin. Peripheral blood mononuclear cells isolated from the patient and normal controls were incubated with ciprofloxacin. The patient showed an increase in interleukin-5 and interleukin-13, while normal controls did not. Conclusion: This is the first case of ciprofloxacin-induced delayed anaphylaxis which was confirmed with oral provocation tests and in vitro cytokine analysis.
증례 : 소화기 ; 간세포암 치료로 고주파열치료 시행 후 발생한 간대장누공 1예
강민규 ( Min Gyu Kang ),이태희 ( Tae Hee Lee ),나운태 ( Woon Tae Na ),정지현 ( Ji Hyun Jeong ),임동혁 ( Dong Hyuk Lim ),이만 ( Mahn Lee ),강영우 ( Young Woo Kang ) 대한내과학회 2012 대한내과학회지 Vol.83 No.4
Radiofrequency ablation (RFA) is a relatively safe therapy for patients with hepatocellular carcinoma (HCC); however, complications are not unknown. A hepatocolic fistula is a rare complication after RFA. We report a case of a hepatocolic fistula following a liver abscess after RFA for HCC in a 58-year-old male. The patient was diagnosed with HCC and liver cirrhosis from hepatitis B infection 3 years prior to admission. The HCC was in segment 6 of the liver and was treated with transarterial chemoembolization and RFA. One month after the second RFA, he was diagnosed with a liver abscess, for which he was treated with antibiotics for 2 months, but continued to have intermittent fever and chills. We made a diagnosis of hepatocolic fistula using colonoscopy, fluoroscopy, and liver dynamic computed tomography. The patient underwent a surgical procedure after antibiotic therapy. Although a hepatocolic fistula is a rare complication following RFA, clinicians should be aware of its existence. (Korean JMed 2012;83:480-484)
증례 : 소화기 ; 급성 A형 간염 산모에서의 신부전, 췌장염 및 태아의 사산 1예
강민규 ( Min Gyu Kang ),이태희 ( Tae Hee Lee ),박정호 ( Jung Ho Park ),최인기 ( In Kee Choi ),선제형 ( Jae Hyung Sun ),천상열 ( Sang Lyeol Cheon ),강영우 ( Young Woo Kang ) 대한내과학회 2010 대한내과학회지 Vol.78 No.5
급성 A형 간염은 간외 합병증이 적고 저절로 좋아지는 질환으로 일반적으로 인식하고 있다. 그러나 최근 관절염, 혈관염 급성 신부전, 전격성 간부전, 췌장염 등의 전신 합병증이 많이 보고되고 있다8). 비전격 A형 간염에서 본 증례와 같이 급성 췌장염, 신부전 및 사산 등 여러 합병증이 병발하는 경우가 드물어 이를 문헌고찰과 함께 보고하고자 한다. The incidence of hepatitis A has increased sharply in Korea, and cases have been associated with many complications. We report a pregnant woman who developed acute renal failure, acute pancreatitis, and stillbirth associated with hepatitis A. She had no relevant medical history. She was admitted to hospital with vaginal bleeding, fever, and myalgia. The initial laboratory data and clinical findings were compatible with acute hepatitis, renal failure, and pancreatitis. To the best of our knowledge, this is the first case report of non?fulminant hepatitis with multiple complications in Korea. (Korean J Med 78:620-623, 2010)