기계적 합금화 공정으로 제조한($Pb_{1-x}Sn_x$)Te 가압소결체의 열전특성

이준수,최재식,이광응,현도빈,이희웅,오태성,Lee, Jun-Su,Choe, Jae-Sik,Lee, Gwang-Eung,Hyeon, Do-Bin,Lee, Hui-Ung,O, Tae-Seong 한국재료학회 1998 한국재료학회지 Vol.8 No.11

기계적 합금화 공정과 가압소결법으로 ($Pb_{1-x}Sn_x$)Te($0\leq{x}\leq{0.4}$)합금을 제조하여 SnTe 함량에 따른 열전특성을 분석하였다. PbTe와 ($Pb_{0.9}Sn_{0.1}$)Te 가압소결체는 각기 $200^{\circ}C$와 $300^{\circ}C$에서 p형에서 n형으로 천이되었으나, SnTe를 0.2몰 이상 함유한 가압소결체는 $450^{\circ}C$까지의 온도범위에서 p형 전도를 나타내었다. Extrinsic 전도영역에서 SnTe 함량이 증가함에 따라 ($Pb_{1-x}Sn_x$)Te 가압소결체의 Seebeck 계수와 전기비저항이 감소하였다. SnTe 함량이 증가함에 따라 (Pb1-xSnx)Te 가압소결체의 최대성능지수를 나타내는 온도가 고온으로 이동하였으며, ($Pb_{0.7}Sn_{0.3}$)Te 가압소결체는 $200^{\circ}C$에서 $0.68\times10_{-3}/K$의 최대성능지수를 나타내었다. Thermoelectric properties of ($Pb_{1-x}Sn_x$)Te ($0\leq{x}\leq{0.4}$) alloys, fabricated by mechanical alloying and hot pressing, were investigated with variation of the SnTe content. For the hot-pressed PbTe and ($Pb_{0.9}Sn_{0.1}$)Te. transition from p-type to n-type occurred at $200^{\circ}C$ and $300^{\circ}C$, respectively. However, the specimens containing SnTe more than 0.2mole exhibited p-type conduction up to 450'C. In extrinsic conduction region, the Seebeck coefficient and electrical resistivity of the hot-pressed ($Pb_{1-x}Sn_x$)Te decreased with increasing the SnTe content. The temperature at which the hot-pressed (Pbl-,Sn,)Te exhibited a maximum figure-of-merit was shifted to higher temperature with increasing the SnTe content The hot-pressed (Pbo ,Sno dTe exhibited a maximum figure-of-merit of $0.68\times10_{-3}/K$ at $200^{\circ}C$.

운용해양시스템을 위한 한국정선해양관측시스템 발전방향

이준수,서영상,고우진,황재동,윤석현,한인성,양준용,송지영,박명희,이근종,Lee, Joon-Soo,Suh, Young-Sang,Go, Woo-Jin,Hwang, Jae-Dong,Youn, Seok-Hyun,Han, In-Seong,Yang, Joon-Yong,Song, Ji-Young,Park, Myung-Hee,Lee, Keun-Jong 해양환경안전학회 2010 해양환경안전학회지 Vol.16 No.3

1961년부터 2010년 현재까지 현행 국가정선해양관측이 고전적 방법에 의해 수행됨으로써 자동화된 시스템의 형태로 실시간 혹은 준실시간으로 자료를 제공하지 못하게 되는 부분에 대한 개선방향을 살펴보고, 우리나라 운용해양시스템의 실용화를 위하여 국가정선해양관측이 나아가야 할 방향을 제시하였다. 선상에서 관측이 끝난 이후부터 데이터베이스에 자료가 저장되는 시점까지 행해지는 수동화된 작업을 대체하기 위해서는, 수온, 염분뿐만 아니라 다양한 자동측정센서가 부착된 CTD(Conductivity-Temperature-Depth)에 연동된 컴퓨터에서 해양관측자료를 처리하고 실시간으로 품질관리를 수행하며 통신수단에 맞게 자료를 전송할 수 있도록 하는 자동화 소프트웨어의 개발이 필요하다. 관측자료를 실시간의 형태로 전송하기 위해서는 Inmarsat 위성통신장비를 활용한 전송시스템이 타당하고, 준실시간 형태의 전송으로는 CDMA(Code Division Multiple Access) 무선통신방식을 사용하여 연안역에 도달했을 때 수집된 자료들을 묶어서 보내는 방식이 적합하다. 실시간 품질관리 과정을 포함시켜 관측시 발생할 수 있는 여러 가지 원인의 오류를 미연에 방지할 수 있을 것이다. This study seeks to improve NFRDI Serial Oceanographic observation (NSO) system which has been operated at current observation stations in the Korean Seas since 1961 and suggests the direction of NSO for practical use of Korean operational oceanographic system. For improvement, data handling by human after CTD (Conductivity-Temperature-Depth) observation on the deck, data transmission, data reception in the land station, and file storage into database need to be automated. Software development to execute QA/QC (Quality Assurance/Quality Control) of real-time oceanographic observation data and to transmit the data with conversion to appropriate format automatically will help to accomplish the automation. Inmarsat satellite telecommunication systems with which have already been equipped on board the current observation vessels can realize the real-time transmission of the data. For the near real-time data transmission, CDMA (Code Division Multiple Access) wireless telecommunication can provide efficient transmission in coastal area. Real-time QA/QC procedure after CTD observation will help to prevent errors which can be derived from various causes.

원발성 답증성 간경변에 대한 장기간 한방 치험례

이준수,홍상훈,김강산,박상은,Lee, Jun-su,Hong, Sang-hoon,Kim, Gang-san,Park, Sang-eun 대한한방내과학회 2016 大韓韓方內科學會誌 Vol.37 No.2

Objective: This study was designed to assess the clinical effect of traditional Korean medicine on primary biliary cirrhosis.Method: We provided herbal medicine and acupuncture therapy to a 38-year-old male patient who complained about jaundice, itching, and fatigue. During a six-day hospital stay, we checked any changes in symptoms and conducted liver function tests (such as aspartate aminotransferase [AST], alanine aminotransferase [ALT], alkaline phosphatase [ALP], and gamma-glutamyl transferase [GGT], among others) to evaluate any improvement.Results: We observed that herbal medicine and acupuncture therapy appeared to decrease the symptoms of primary biliary cirrhosis. During each hospital stay, the symptoms and liver function test both showed improvement, especially in ALP.Conclusion: Based on the therapeutic results of the six-day hospital stay, we report improved primary biliary cirrhosis symptoms and a decreasing tendency in ALP and GGP levels following treatment with traditional Korean medicine.

혈관내 광음향 영상을 위한 고주파수 초음파 수신 변환기 제작 및 평가

이준수,장진호,Lee, Jun-Su,Chang, Jin Ho 한국음향학회 2014 韓國音響學會誌 Vol.33 No.5

Photoacoustic imaging is a useful tool for the diagnosis of atherosclerosis because it is capable of providing anatomical and pathological information at the same time. A photoacoustic signal detector is a pivotal element to achieve high spatial resolution, so that it should have broadband spectrum with a high center frequency. Since a photoacoustic imaging probe is directly inserted into blood vessel to diagnose atherosclerosis, the total size of the photoacoustic signal detector should be less than 1 mm. The main purpose of this paper is to demonstrate that PVDF can be used as an active material for the photoacoustic signal detector with a high frequency and broadband characteristic. The photoacoustic signal detector developed in this study was a single element ultrasound transducer with an aperture of $0.5{\times}0.5mm$ and the total size of 1 mm. In the design stage, the natural focal depth was adjusted for an effective focal area to cover the region of interest, i.e., 1~5 mm in depth. This was because geometrical focusing could not be used due to the small aperture. Through a pulse-echo test, it was ascertained that the developed photoacoustic signal detector has the -6 dB bandwidth ranging between 40.1 and 112.8 MHz and the center frequency of 76.83 MHz. 광음향 영상은 조직의 형태학적 정보뿐만 아니라 병리학적 정보도 함께 제공할 수 있어 죽상동맥경화증 진단에 유용하게 사용될 수 있다. 높은 해상도의 광음향 영상을 획득하기 위해서는 광음향 신호를 수신할 초음파 변환기가 고주파수 및 광대역 특성을 가져야만 한다. 또한 죽상동맥경화증 진단을 위해서는 혈관에 변환기를 직접 삽입하여 광음향 영상 신호를 획득해야하기 때문에 그 크기가 1 mm 이하가 되어야만 한다. 본 논문에서는 PVDF 압전 소재를 이용하여 혈관내 광음향 영상을 위한 고주파수, 광대역 특성을 갖는 초음파 변환기 제작이 가능함을 보였다. 개발한 광음향 수신 변환기는 단일소자이며 구경은 $0.5{\times}0.5mm$이고 전체 변환기 크기는 직경이 1 mm이내가 되도록 하였다. 작은 크기로 인해 형태학적 빔집속이 아닌 자연집속 깊이를 조절하여 관심영역(1~5 mm)에서 빔집속이 되도록 설계하였다. 제작한 혈관내 광음향 수신 변환기의 주파수 특성을 펄스-에코 응답실험을 통해 알아보았다. 제작된 변환기는 -6 dB 대역폭이 40.1~112.8 MHz이며, 중심 주파수가 76.83 MHz인 고주파수 및 광대역 특성을 갖는다는 것을 실험적으로 확인하였다.

한방병원 입원환자의 한약제제 사용에 따른 혈액학적 변화

이준수,김민서,박상은,Lee, Jun-su,Kim, Min-serh,Park, Sang-eun 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.1

In this study, we researched the effects of herbal medicine on anemia among 43 patients. Before being given prescriptions, these patients were examined for RBC count, hemoglobin, and hematocrits, which are important in evaluating improvements in anemia. After administering the herbal medicine over two weeks, we rechecked the RBC count, hemoglobin, and hematocrits on a secondary inspection. We compared the primary and secondary tests with respect to age, sex, diseases, the name of the herbal medicine, and the composition of the medicine. The results were as follows. In groups of five or more, the musculoskeletal pain disease group was more improved than the other disease groups on the secondary test. The digestive diseases group was worse than the other disease groups on the secondary test. In the composition of the prescription, herbs that enriched the blood (補血), invigorated the spleen (健脾), and nourished Eum (補陰) were used more than any other herbs for those whose status improved. Among patients who were partially normalized for the secondary test, this applied to men more than women, to patients in the pain group more than those in other disease groups, and to patients with cerebral hemorrhage more than stroke patients. Among patients who were partially normalized for the secondary test, the group taking tangyak herbal medication improved more than the other groups taking powder and pill herbal medications.

호텔 객실의 에너지 효율화를 위한 대기전력 분석 - 체크아웃 상태를 중심으로 -

이준수,구충완,Lee, Junsoo,Koo, Choongwan 인천대학교 도시과학연구원 2022 도시과학 Vol.11 No.1

The issue of hotel energy use is growing more significant as the hotel industry expands. It is important to take into account the electrical installation and space-specific features in a room unit in order to comprehend the energy consumption of a hotel guestroom. In light of this, this study aimed to analyze standby power for enhancing the energy efficiency of a hotel guestroom during check-out status. This study was conducted in three steps: (i) data collection; (ii) analysis of energy consumption patterns; and (iii) analysis of energy efficiency improvement plan. The main findings of this study can be summarized as follows. First, 32.24% of energy was used in fan coil unit) during check-out status. Second, a hotel guestroom had a 4.30% energy saving potential, based on energy consumption patterns during check-out status. This study can contribute to support hotel management to operate guestrooms differently by helping them identify patterns in energy use and realize potential savings.

5 축 공작기계 사이클 타임 예측

이준수(J.-S. Lee),이찬영(C.-Y. Lee),황순홍(S.-H. Hwang),이재호(J. H. Lee),하태인(T. I. Ha),강상원(S. Kang),민병권(B.-K. Min) Korean Society for Precision Engineering 2022 한국정밀공학회 학술발표대회 논문집 Vol.2022 No.10

엽소병 저항성 계통 선발

이준수(Joon-Soo Lee),이성식(Sung-Sik Lee),이장호(Jang-Ho Lee) 고려인삼학회 2008 고려인삼학회 학술대회 Vol.2008 No.12

인삼 품종별 종자의 크기가 개갑율 및 묘삼생육에 미치는 영향

이준수(Joon-Soo Lee),이성식(Sung-Sik Lee),이장호(Jang-Ho Lee),안인옥(In-Ok Ahn) 고려인삼학회 2008 Journal of Ginseng Research Vol.32 No.3

본 실험은 품종별 종자의 크기가 묘삼의 소질에 미치는 영향을 조사하고 우수한 묘삼생산의 기초자료로 삼고자 수행하였다. 품종간 종자크기별 개갑율과 생존율을 조사한 결과 개갑율은 품종에서 선운이 가장 우수하였고, 천풍의 개갑율이 가장 불량하였다. 종자크기는 개갑율 과 생존율에 영향을 미치지 못하였다. 경장, 경직경, 엽면적은 종자의 크기가 클수록(4.7 ㎜ 이상) 생육이 우수하였으며 종자의 크기가 작을수록 생육이 불량하여 지상부 생육에 종자의 크기가 영향을 미치는 것으로 확인되었다. 근장, 근직경, 근생체중은 종자의 크기가 큰 것(4.7 ㎜ 이상)이 생육이 우수하였으며, 종자의 크기가 작은 것은 생육이 불량하였다. 종자크기별 이용가능 및 불용묘삼을 조사한 결과 종자의 크기가 클 수 록 이용가능 묘삼의 수량과 본수 증가하는 경향이었다. 품종에서는 연풍, 금풍, 고풍이 지상하부의 생육이 우수하였으며, 천풍은 지상하부의 생육이 낮았다. 사용가능 및 우량묘삼을 생산하기 위하여 4 ㎜이상의 종자만을 파종하여야 할 것으로 생각된다. This study was carried out to obtained the basic information for seed coat dehiscence and seedling performance according to seed size of eight ginseng cultivars. Seed size was separated into four grade(upper 5.0, 5.0-4.7, 4.7- 4.0, and under 4.0㎜ in diameter). Seed coat dehiscence and survival ratio of seedling were not affected by seed size. Aerial parts growth of seedling such as stem length, stem diameter, and leaf area of seedling were larger seed(upper 5.0 ㎜) better than those of small seeds(4.7-4.0, and under 4.0 ㎜ in diameter). Also root part growths such as root diameter, and fresh weight were larger seed(upper 5.0 ㎜) higher than those of small seeds(4.7-4.0, and under 4.0 ㎜ in diameter). However, root length was not affected by seed size. Growth status of aerial and root parts of ‘Yunpoong’, ‘Gumpoong’, and ‘Gopoong’ were better than those of other cultivars in each grade of seed sizes. The growth of characteristics of ‘Chunpoong’ and ‘Chungsun’ were less than those of other cultivars.

6-자유도 쿼드로터 모델링 및 시뮬레이션

이준수(Junsoo Lee),이석원(Seok-won Lee),이상현(Sanghyun Lee),김유단(Youdan Kim) 한국항공우주학회 2017 한국항공우주학회 학술발표회 논문집 Vol.2017 No.4