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리눅스상에서 IPv6 플로우 레이블을 이용한 포워딩의 구현
이주철(Joo-Chul Lee),안종석(Song-Suk Ahn) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1A
IPv6는 IPv4의 단점을 보완한 차세대 인터넷 프로토콜이다. IPv6 헤더는 플로우 레이블 필드를 제공하여 레이블 값에 따라 차등적인 서비스를 제공할 수 있는 기반을 갖추었다. 본 논문에서는 이러한 레이블의 용도 외에 레이블을 이용한 포워딩 방법을 제안한다. 레이블을 이용한 포워딩은 기존의 MPLS와 유사한 방식으로 이루어진다. 두 방법의 차이점은, 첫째 MPLS는 속도를 빠르게 하기 위하여 대부분의 스위칭이 2 계층에서 이루어지지만 플로우 레이블을 이용한 방법은 3 계층에서 처리된다. 둘째, 패킷에 플로우 레이블을 기록할 때 기존의 IPv6 헤더 필드를 이용하기 때문에 MPLS에서와 같이 별도의 헤더가 필요치 않다. 또한 레이블과 플로우에 대한 서비스 정보를 매핑시킬 경우 좀더 수월하게 차등적 서비스를 지원할 수 있다. 본 논문에서는 IPv6 레이블 포워딩을 구현해서 실험한 실험 망과 현재 리눅스 커널(2.2.X)상에서 구현되어 있는 IPv6의 포워딩 구조, 그리고 구현된 플로우 레이블 포워딩에 대하여 논한다.
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이주철,최환준,김준혁,이영만,남두현,Lee, Joo Chul,Choi, Hwan Jun,Kim, Jun Hyuk,Lee, Young Man,Nam, Doo Hyun 대한미세수술학회 2012 Archives of reconstructive microsurgery Vol.21 No.2
Purpose: The vessels of peripheral nerves have been extensively studied since Breidenbach used vascularizd nerve grafts. Tayor and Pinel studied the course and distribution of the vessels of peripheral nerves. However, the vessels of digital nerves are still not well known. The objective of this study was to prove vessels of digital nerves and to investigate the pathway of that. Materials and Methods: 36 patients and 2 fresh human cadavers were studied under the microscope and histologic sections under the light microscope.. Results: We found that digital nerves had own arterioles and venules as well as peripheral nerves. This small vessels of digital nerves paralleled the digital nerves or run in a spiral. Digital nerves were abundantly vascularized throught their length by a succession of vessels and by their repeated divisions and anastomoses. Conclusion: The clinical implications of this results can be discussed in relation to the dissection of nerves, the possibility of vasculized nerve grafts.
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이주철(Joo-Chul Lee),김기현(Ki-Hyun Kim),이영철(Young-Chul Lee) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.5
The current-carrying capacities in IEC standards for underground refers to a soil thermal resistivity of 2.5[K?m/W] where no measured data are available. But this value is considered too conservative and may not justifiable economically as to need precaution in using the value. In this paper, the standard practices on the application of soil thermal resistivity of some countries(UK, USA etc) are surveyed and proposed a reasonable representative value 1.0[K?m/W] of soil thermal resistivity considering the domestic soil thermal properties with regard to the application of IEC standard.
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이주철,장덕석,김동식,Lee, Joo-Chul,Jang, Deok-Suk,Kim, Dong-Sik 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2
Liquid-assisted cleaning technology utilizing a nanosecond laser pulse is effective for removing submicron particulates from a variety of solid substrates. In the technique, saturated vapor is condensed on a solid surface to form a thin liquid film and the film is evaporated explosively by laser heating. The present work studies the role of liquid-film evaporation in the cleaning process. First, optical interferometry is employed for in-situ monitoring the displacement of the laser-irradiated sample in the cleaning process. The experiments are performed for estimating the recoil force exerted on the target with and without liquid deposition. Secondly, time-resolved visualization and optical reflectance probing are also conducted for monitoring the phase-change kinetics and plume dynamics in vaporization of thin liquid layers. Discussions are made on the effect of liquid-film thickness and dynamics of plume and acoustic wave. The results confirm that cleaning force is generated when the bubble nuclei initially grow in the strongly superheated liquid.
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이주철(Joo-Chul Lee),신명기(Myung-Ki Shin),홍용근(Yong-Geun Hong),김형준(Hyungg-Jun Kim) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅲ
공중 무선랜 서비스는 대학이나 호텔, 역 주변 등과 같은 핫 스팟지역에서 각광을 받을 새로운 킬러 응용으로 떠오르고 있다. 하지만 이러한 공중 무선랜 서비스는 현재 위기로 치닫고 있는 IPv4 주소부족문제로 인해 원활한 도입에 제약을 받을 수 있다. 따라서 본 논문에서는 IPv6를 이용하여 IPv4 주소부족문제에도 대처하고 필요에 따라 IPv4주소를 이용하여 기존서비스를 사용하는 데 문제가 없도록 해주는 메커니즘을 제안하였다. 본 메커니즘의 기반 기술은 DSTM이라고 하는 IPv4/IPv6 전환기술 중 하나이며, 이 기술을 무선랜이라는 환경의 특성에 맞게 수정 보완하였다.
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이주철,박은수,곽정자,Lee, Joo Chul,Park, Eun Soo,Kwak, Jeong Ja 대한두개안면성형외과학회 2012 Archives of Craniofacial Surgery Vol.13 No.2
Purpose: Basal cell adenoma of the salivary gland is an uncommon type of monomorphic adenoma. The most frequent location is parotid gland. It usually appears as a firm, mobile and slow-growing mass. Originally the term "basal cell adenoma" is described as a benign salivary gland tumor comprised of uniform appearing basaloid cells which are arranged in solid, trabecular, tubular, and membranous patterns. But the myxoid and chondroid mesenchymal like component as seen in pleomorphic adenoma is lacking in basal cell adenoma. We report a case of basal cell adenoma of parotid gland with review of the literatures. Methods: The 59-year-old female patient was referred to our department with a painless palpable mass in the left preauricular region for about 1 year. Movable and nontender subcutaneous mass was palpable. There was no evidence of cervical metastasis in computed tomography and ultrasonography. On fine needle aspiration cytology, pleomorphic adenoma was suspected. Under general anesthesia, superficial parotidectomy including tumor was performed. The biopsy result was basal cell adenoma. Results: Long-term follow-up for 54 months showed favorable result without evidence of recurrence except for temporary facial nerve weakness right after the surgery. Conclusion: Basal cell adenoma is the third most frequent benign tumor of the salivary gland, following pleomorphic adenoma and Warthin's tumor, although the incidence is low. The typical clinical feature of the basal cell adenoma is slowly growing, asymptomatic, and freely movable parotid mass. Basal cell adenoma should be also considered as a differential diagnosis of the parotid gland benign tumor.
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채준석,인동철,한재철,김남수,이주묵,최인혁,Chae Joon-Seak,Ihn Dong-Chul,Han Jae-Chul,Kim Nam-Soo,Lee Joo-Muk,Choi In-Hyuk 한국임상수의학회 1989 한국임상수의학회지 Vol.6 No.1
A dog which was hospitalized to Veterinary Teaching Hospital, College of Veterinary Medicine, Jeonbug National University on December 28, 1988 was revealed severe anemia: hemoglobinuria and weakness. In the inspections, abdominal pain and spleno megaly at the ventral abdomen were detected by palpations. In the examinations of blood, the obtained results were summarized as follows: Babesla spp. was identified on the blood smear stained with Giemsa. The Babesia spp. was assumed to the Babesia gibsoni for the their small size and pleomorphism such as comma form, ring form and dot form. In the blood examinations of the patient, Ht: 22.5%, RBC:354${\times}$10$^4$/${\mu}\ell$, Hb: 8.8g/dl, serum protein: 8g/dl, and WBC count was 21, 425/${\mu}\ell$. In the chemical examinations of serum, the value of AST(GOT) was 30iu and ALT(GPT) was 20iu, respectively. The blood sugar was 60mg/d1. In the urine test, urine protein was 30mg/d1 and the hemoglobin In the urine was the +++ and occult blood reaction(Benzidine test) in the feces was +++. Splenomegaly was confirmed by X-ray examination. To confirm for the Babesia spp. infection, 5ml of the whole blood of the patient(3% of Parasitized erythrocytes) were inoculated into the cephalic vein of the two normal dogs. In the blood of experimental dogs which were inoculated parasitized blood, Babesia spp. was detected in the two doss and pleomorphic parasites were observed, too. In the blood examinations of No. 1 the Ht and RBC were decreased to 6.8% and 52${\times}$10$^4$/${\mu}\ell$, respectively. WBC count was 10.600/${\mu}\ell$ and serum protein was 6.8g/dl. The rates of parasitized erythrocytes were 15% in the experimental dog. Also +++ of the hemoglobin was detected in the urine. In the X-ray examination, splenomegaly was comfirmed and it was confirmed by autopsy of the experimental dog(No. 1).
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최선락,이주철,김동식,Choi, Sun-Rock,Lee, Joo-Chul,Kim, Dong-Sik 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.9
The mirage technique is proved to be powerful in measuring the thermal diffusivity of materials. In particular, its contactless nature makes it suitable for delicate samples and microscale structures. In this study, thermal-wave-coupling method is developed in a general form for both thermally thin and thick samples. In the suggested measuring scheme, the probe beam can be positioned close to the pump beam and the absolute position need not be measured. Therefore the new scheme provides a relatively simple yet effective way to determine the thermal diffusivity of thermally thick samples. Thermal diffusivities of bulk samples like Ni and Al were measured and the characteristics of mirage signal for a thin film were observed by using the mirage experimental setup. The apparent thermal diffusivity was measured by varying such parameters as probe beam height, size of pump beam, power of pump beam, and surface condition of sample. From the practical standpoint, it is shown that the size of the pump beam is the most important factor for accurate thermaldiffusivity measurement. Experiments using thin-film samples show that the thermal diffusivity of a substrate covered with thin film can be measured by photothermal mirage signals.
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