UHF 대역 RFID 태그 칩을 위한 저전력 CMOS 아날로그 Front-End 회로 설계

심현철(Hyun-Chul Shim),차충현(Chung-Hyun Cha),박종태(Jong-Tae Park),유종근(Chong-Gun Yu) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.6

본 논문에서는 UHF 대역 RFID 태그(tag) 칩을 위한 저전력 CMOS 아날로그 회로를 설계하였다. 설계된 아날로그 front-end 블록은 국제표준인 ISO/IEC 18000-6C 표준규격을 따르며, 성능테스트를 위한 메모리 블록을 포함하고 있다. 모든 회로를 1V에서 동작하도록 하여 세부 회로들의 전력소모를 최소화 하였으며, 보다 적은 전류소모로 정확한 복조를 위해 전류모드 슈미트 트리거를 이용한 ASK 복조기를 제안 하였다. 설계된 회로는 0.18㎛ CMOS 공정을 이용하여 칩으로 제작되었으며, 측정결과 최소 0.25Vpeak 입력으로 동작 가능하였고, 1V 전원전압에서 2.63㎂의 전류소모를 갖는다. 칩 면적은 0.12㎟이다. This paper describes a low-power CMOS analog front-end block for UHF band RFID tag chips. It satisfies ISO/IEC 18000-6C and includes a memory block for test. For reducing power consumption, it operates with an internally generated power supply of 1V. An ASK demodulator using a current-mode schmitt trigger is proposed and designed. The proposed demodulator can more exactly demodulate than conventional demodulator with low current consumption. It is designed using a 0.18㎛ CMOS technology. Measurement results show that it can operate properly with an input as low as 0.25Vpeak and consumes 2.63㎂. The chip size is 0.12㎟.

토정 이지함에 대한 경영학적 소고

심현철(Shim Hyun Chul) 성신여자대학교 경영연구소 2014 경영관리연구 Vol.7 No.2

한국적 경영 모델의 형성을 위해 과거의 한국 경영자들의 경영실제를 살펴보는 것이 필요하다. 본고는 선구적인 경제이론가요 경영실천가인 토정 이지함에 대하여 고찰하였다. 관련연구들을 참고하여 연구모형을 설정하였고, 이 모형의 틀에 따라 이지함의 경영실제를 분석하였다. 경영계획 측면에서, 이지함은 뚜렷한 국가경제관점과 사회적 책임의식을 가졌다. 조직화의 측면에서, 솔선수범하여 근검절약하였고, 사람을 평등하게 대우했다. 지휘 측면에서 교육훈련을 실시했고, 고충처리를 우선시했다. 사기앙양의 방법으로 토정비결을 발간하였다. 마케팅과 물류활동으로 백성들을 구제하였고, 해외 무역도 추진하였다. 생산운영관리는 투명경영을 표방하였다. 왕에게 어업, 염업, 옥광, 및 은광의 개발을 통한 국민소득의 증대를 제안했다. 이지함의 모형은 우리에게 많은 시사점들을 제시한다. 첫째, 사회의 부정부패를 일소하는것이 경제를 부흥시킬 것이다. 둘째, 기업이 사회적 책임을 우선시한다면 공공복지에 보다 나은 기여를 하게 될 것이다. 셋째, 국민경제의 신규사업 창조를 위해 재능있는 인재들을 활용해야 한다. 본 연구의 한계는 연구자료가 많지 않았다는 점이다. 앞으로 보다 심도있는 이지함 연구들이 진행되기를 기대한다. The review on the practices of Korean business-administrators of old times for the formation of Korean-management model is needed. I have reviewed the schola Tojeong Lee Ji Ham who was an early economist and was practicing business-administration. I have constructed my research model after referring to related studies on him. And I have analyzed the managerial practices of Lee Ji Ham within the framework of the model. In managerial planning, Lee Ji Ham had vivid national economic view and the concept of social responsibility. In organizing the enterprises, he took the initiative and set an example in frugality and treated people equally. In leading the business, he implemented eduacation and training, putting grievance settlement as a priotity. To encourage morale of people, he published the prophetic writing- Tojeong-Bigyeol. Through marketing and logistics in business he had helped the poor and he started overseas trade. In operating business, he adopted transparent management. He made a suggestion to the king on the development of fishery, salt farm, silver mine and jade mine for national wealth. Lee Ji Ham"s model has many implications on us. First, rooting out the corruption and irregularities will revitalize Korean economy. Second, if companies focus on the social responsibility first, they can contribute better to public welfare. Third, in order to create new businesses for Korean economy, we should use the talented persons. The limitation of this study is the shortage of research materials. I expect more in-depth studies carried out by many on Lee Ji Ham.

단세포군 감마글로불린병증을 동반한 경화점액수종

심현철 ( Hyun Chul Shim ),김건 ( Geon Kim ),최지현 ( Ji Hyun Choi ),김지혜 ( Ji Hye Kim ),김은정 ( Eun Jung Kim ),박향준 ( Hyang Joon Park ),조옥자 ( Ok Ja Joh ),송계용 ( Kye Yong Song ) 대한피부과학회 2011 대한피부과학회지 Vol.49 No.5

Scleromyxedema is a rare disorder characterized by generalized papular and sclerodermoid eruption, increased fibroblast proliferation, mucin deposition, and monoclonal gammopathy in the absence of thyroid disease. It is a generalized subtype of lichen myxedematosus. A paraproteinemia, typically an IgG λ, is observed in more than 80% of patients with scleromyxedema. Here, we report a 38-year-old woman with a 1-year history of a progressively spreading of eruption of small papules on the entire body, including the face, neck, arms, legs, and trunk. Laboratory tests were within normal limits, except λ light chain monoclonal gammopathy. We administered oral retinoid and topical steroid with slight clinical improvement. To our knowledge, this is the first reported case of scleromyxedema in Korea. (Korean J Dermatol 2011;49(5):440∼443)

민회빈의 경영실천에 대한 고찰

심현철(Hyun-Chul Shim) 韓國經營史學會 2015 經營史學 Vol.76 No.-

본고에서는 민회빈의 경영적인 활동을 고찰하였다. 민회빈은 당시 심양관에서 파견된 조선관료 집단의 경영 CEO로서 역할 하였다고 평가된다. 민회빈의 리더십은 소현세자에 대한 지원과 대리 등에서 나타난다. 국제경영 측면에서 소현세자부부는 청나라에 필요한 물자의 공급 등 국제적인 교역에 힘썼다. 북경 체류 시에는 선교사 아담 샬과의 교류 등 해외정보의 수집을 위한 귀중한 기회를 가졌다. 생산운영관리 측면에서 민회빈은 성공적인 농장경영을 운영하였다. 심양관은 자급자족할 수 있었고 여유자금으로는 피로인의 속환까지 병행할 수 있었다. 재무관리 측면에서, 귀국 시 소현세자 부부가 소장한 재산은 30억 753 만 189원으로 추산된다. 이것은 교역과 농장운영 등의 경영활동이 성공적이었음을 방증한다. In this paper, I have considered the managerial activities of the Crown Princess Minhoebin. Minhoebin had played as the chief executive officer of the government officials dispatched from Seoul in the Guest House of Shenyang. Minhoebin had played remarkable leadership with her support to the Crown Prince Sohyunseja. The couple of Sohyunseja had traded with the Ching Dynasty, supplying materiels needed to the people. It was a kind of global management. When they had stayed in Beijing, they had precious opportunities of collecting informations from abroad, contacting with the missionary Adam Schall. Like a production manager, Minhoebin had operated successfully large-scale farms for 3 years. The crew of government officials in the Guest House of Shenyang could live itself sufficiently, and Minhoebin had redeemed the captives in the Ching Dynasty with the surplus fund from farm management. Financially, the couple of Sohyunseja had carried $ 2,576,043 when they had returned home permanently. That money shows how successful their management in global trade and farm operation really were.

켈로이드의 절제술 후 방사선 치료가 재발 억제에 미치는 효과

심현철 ( Hyun Chul Shim ),주민숙 ( Mihn Sook Jue ),김은정 ( Eun Jung Kim ),이종은 ( Jong Eun Lee ),박향준 ( Hyang Joon Park ) 대한피부과학회 2014 대한피부과학회지 Vol.52 No.1

Background: The treatment of keloids is unsatisfactory and even a challenge to many dermatologists or dermatosurgeons. Simple excision of a keloid alone is associated with a high recurrence rate. Thus, surgical treatment should be combined with various adjuvant therapies. Objective: The aim of this study was to evaluate the efficacy of postoperative radiation therapy on the recurrence of keloids. Methods: Between March 2007 and May 2012, 24 patients with keloids (n=56) in various anatomical sites were treated with our protocol consisting of total or subtotal keloidectomy followed by immediate irradiation of 12∼18 Gy in 3 fractions over 3 days with pre- and postoperative intralesional steroid injection as an adjuvant therapy. After a year to a year and a half, treatment was terminated at that point. Results: When treated keloids were classified according to the degree of flattening, the outcomes were excellent in 48.2% (27/56) of the patients, good in 32.1% (18/56), fair in 14.3% (8/56), and poor in 5.3% (3/56). This treatment protocol showed almost excellent outcomes in earlobe, earhelix, retroauricular region and abdomen. Although the sites with high stretch tension such as chest and shoulder showed above good outcomes (72%, 18/25), they also showed three poor results. The most common complication was postinflammatory hyperpigmentation while the most serious one was full-thickness skin necrosis, which was recovered by skin graft later. Conclusion: Radiation therapy is an effective and safe therapy for the prevention of recurrence of keloids following keloidectomy. (Korean J Dermatol 2014;52(1):20∼25)

국내중시 변동의 구조적 특징

심현철(Hyun Chul Shim),이청림(Cheong Lim Lee),김태호(Tae Ho Kim) 한국경영학회 2002 經營學硏究 Vol.31 No.4

In many real situations there is an obvious time lag between variations of some variables and response of the other. A more general hypothesis is that the effect of a change in a variable is not felt all at once at a single point in time, but the impact is distributed over a number of future point in time. If time lag series of independent variables are incorporated in the model specification, it is possible to explain the relationship between the variables in different points of time and to estimate the long-run impacts of a change in a variable on another. In this study, dynamic time lags are specified in the statistical models to analyze the variations and long-run adjustments of the domestic stock market. Since the market has been irregularly influenced by unexpected economic conditions, polynomial distributed lag is selected, after carefully examining the data, to investigate the structural feature of the stock market behavior over time. In addition, KOSPI market appears to be more responsive to changes in the foreign variables, such as DOWJONES index, in both of the short and the long run. On the other hand, it is found that KOSDAQ market tends to be affected more by the foreign variables like NASDAQ in the short run but by the variations of the domestic market factors in the long run.

우리나라 관광산업의 서비스품질의 발전방향

심현철 ( Hyun Chul Shim ) 관광경영학회 2009 관광경영연구 Vol.39 No.-

This study aims at investigating the relationships between service quality factors and the achievement of tour, and discovering what differences exist in the achievements of inbound tours according to the main purpose of visit and the regional groups. In this study, the tourism service quality factors are classified as the efficiency of tourism process and the effectiveness of tourism destination. The achievement of tour contains the visitor`s overall satisfaction of traveling in Korea, intention to revisit Korea within 3 years, intention to recommend Korea tour, and impression of Korea after visit. This study used the empirical data from a survey of inbound tourists. The technical analysis of the efficiency of tourism process and the effectiveness of tourism destination shows that they influenced the achievement of tour. The achievement of tour differs according to the main purpose of visit and the regional groups. This study also suggests the evolutionary direction of service quality in tourism industry of Korea. More intensive analysis to this subject is recommended.

觀光産業의 서비스品質 評價要因

심현철(Shim, Hyun Chul) 성신여자대학교 한국지리연구소 2003 應用地理 Vol.- No.24

기능저하 저수지 선정을 위한 다기준 의사결정기법 적용성 연구

심현철,최경숙,Shim, Hyun Chul,Choi, Kyung Sook 한국농공학회 2017 한국농공학회논문집 Vol.59 No.3

The decision-making process is the act of finding the best solution among various alternatives through comparison between various criteria based on objectives of the project, evaluation standard, and conditions. However, in practice it is not easy to simply decide the optimum decision, especially for selecting malfunctioning reservoirs because no systematic evaluation criteria or standard assessment process are available. Therefore, this study adopted AHP method, which is a MCDM (multi-criteria decision making technique) to identify the malfunctioning reservoirs for efficient management of reservoirs. Important criteria of the selection of malfunctioning reservoirs and priority weights of each criteria were determined based on results of expert's survey under a stepwise hierarchical approach. The most important factor for the decision of malfunctioning reservoirs was obtained as Reservoir efficiency among the selected criteria including Reservoir efficiency decrease, Disaster Risk, Reservoir efficiency, Available water storage, Future water demand, Resident Needs. The AHP technique was applied on 11 reservoirs in Andong region to verify its applicability. Scoring method was applied for the comparison with the results of AHP method.

UHF대역 RFID 태그를 위한 저전력 고성능 아날로그 회로 설계

심현철,차충현,박종태,유종근,Shim, Hyun-Chul,Cha, Chung-Hyeon,Park, Jong-Tae,Yu, Chong-Gun 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.1

본 논문에서는 $UHF(860{\sim}960MHz)$ 대역 RFTD 태그(tag) 칩을 위한 저전력 고성능 아날로그 회로를 설계하였다. 설계된 아날로그 front-end 블록은 국제표준인 ISO/IEC 18000-6C(EPCglobal class1 generation2) 표준규격을 따르며, 성능테스트를 위한 메모리 블록을 포함하고 있다. 모든 회로를 1V에서 동작하도록 하여 세부 회로들의 전력소모를 최소화하였으며, 보다 정확한 복조를 위해 전류모드 슈미트 트리거를 포함한 ASK 복조기를 제안하였다. 제안된 복조기는 0.014% 복조오차를 갖는다. 설계된 회로를 0.18um CMOS 공정 변수를 이용하여 모의실험 한 결과 최소 $0.2V_{peak}$ 입력으로 동작 가능하며, 1V 전원전압에서 $2.63{\mu}A$의 전류소모를 갖는다. 칩 면적은 $0.12mm^2$이다. This paper describes a low-power high-performance analog front-end block for $UHF(860{\sim}960MHz)$ band RFID tag chips. It satisfies ISO/IEC 18000-6 type C(EPCgolbal class1. generation2.) and includes a memory block for test. For reducing power consumption, it operates with a internally generated power supply of 1V. An ASK demodulator using a current-mode schmitt trigger is proposed and designed. The proposed demodulator has an error rate as low as 0.014%. It is designed using a 0.18um CMOS technology. The simulation results show that the designed circuit can operate properly with an input as low as $0.2V_{peak}$ and consumes $2.63{\mu}A$. The chip size is $0.12mm^2$