• ETRI Journal
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• v.37 no.5
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• pp.845-855
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• 2015

To enable the coexistence of Licensed Assisted Access (LAA) and Wi-Fi in 5 GHz unlicensed bands, a new channel access mechanism is proposed. Accounting for the fairness between LAA and Wi-Fi, the proposed mechanism finds the optimal transmission time ratio by adaptively adjusting the transmission durations for LAA and Wi-Fi. In addition, we propose a new analytical model for the distributed coordination function of IEEE 802.11 through some modifications of conventional analytical models for saturation and non-saturation loads. By computing the activity ratio of Wi-Fi, the proposed analytical model is able to control the time ratio between LAA and Wi-Fi, which is required for practical implementation of the proposed access mechanism. Through numerical simulations, the proposed channel access mechanism is compared with conventional methods in terms of throughput and utility.

• The Korean Society of Law and Medicine
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• v.24 no.3
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• pp.125-153
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• 2023

The Supreme Court's en banc decision on December 12, 2022 (docket number 2016Do21314) presented a new standard for determining whether the use of diagnostic medical devices by Korean medical doctors constitutes oriental medical doctors constitutes unlicensed medical practice. Based on this standard, it was determined that the use of ultrasound by Korean medical doctors was not an unlicensed medical practice. Supreme Court's Decision 2016Du51405 on August 18, 2023, is the first case in which a new standard was applied to determine that an Korean medical doctor's use of electroencephalography to diagnose Parkinson's disease and dementia was not an unlicensed medical practice. The Supreme Court abolished the previous standard that Western medical knowledge and technology should not be required for Korean medical doctors to use medical devices. However, it was unclear whether Western medical diagnosis of Korean medical doctors using diagnostic medical devices would be viewed as an an auxiliary method of diagnosis. Parkinson's disease and dementia are Western medical diagnoses. The Supreme Court judged that the Western medical diagnosis of Korean medical doctors was not an unlicensed medical practice. This clearly explains what an auxiliary method of diagnosis means. In addition, the Supreme Court excluded the principles of development and production of electroencephalography from its judgment criteria. Automatic extraction and automatic reading of test results were also excluded. The criminal court's view that the meaning of oriental medical practice should be clearly and strictly interpreted from the perspective of an oriental doctor, and it was clarified that diagnostic medical devices were excluded from criminal punishment unless it was clear that they were not related to the principle of oriental medical practice. As a result, the Supreme Court made it clear that the use of diagnostic medical devices is excluded from criminal punishment unless it is clear that they are not related to the principles of Korean medicine.

• Information and Communications Magazine
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• v.32 no.11
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• pp.58-64
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• 2015

본고에서는 최근 이동통신분야에서 많은 주목을 받고 있는 비면허대역(unlicensed-band)을 활용한 3GPP Long Term Evolution (3GPP-LTE) 시스템의 표준화 및 상용화 동향을 알아본다. 먼저 비면허대역과 관련 전파규정을 알아보고, LTE 시스템이 비면허대역을 활용할 수 있는 3가지 방법인 LTE-U, LTE-LAA, LTE-H를 각각 알아본다. 각각의 방식의 장단점과 표준화 방향 및 향후 LTE 발전 방향에 미치는 영향을 논의한다.

• The Korean Society of Law and Medicine
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• v.11 no.1
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• pp.173-198
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• 2010

There is a system in Korea named "Advanced Practice Nurse System" qualified by the Minister of Health, Welfare and Family Affairs for Advanced Practice Nurse besides nurse licence. Medical practice is, in today's medical law, understood as a general concept colligating medical practice, nursing practice and midwife practice and so on, for it is defined as a deed of medical technique practiced by medical personnel. Referring to the fact that the Supreme Court recognizes medical personnel as people who have medical expert knowledge, nursing practice can be recognized as a region of medical business and therefore it is not necessary to prescribe nursing practice separately from the definition of medical practice on a precedent, because nurse belongs to medical personnel. According to the precedent regarding 'Unlicensed Medical Practice of Advanced Practice Nurse for Anesthesia' recently sentenced by the Supreme Court, the medical practice is only allowed a doctor because it is 'in need of special knowledge and experience because of high danger on human body' and it is judged to be an unlicensed medical practice prohibited in medical law if it is to be done by a nurse. When considering the actual situation that System for Advanced Practice Nurse for Anesthesia is established under the circumstance that an anesthetist is in want and therefore the operation has not been performed on time, and that it is being expected an anesthetist to be in need, it is necessary to legislate for the range of medical practice of Advanced Practice Nurse so that Advanced Practice Nurse System can be practically legalized, for the role of Advanced Practice Nurse has the great possibility of shrinking because the precedent has considered Advanced Practice Nurse for Anesthesia doing anesthetic operation in clinic today as a potential wrongdoer.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.8
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• pp.841-848
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• 2013

In order for unlicensed devices to co-exist on the same frequency band, the frequency interference mitigation policy is necessary. Because the effects of frequency interference between unlicensed devices may vary depending on the analysis layer, exact interference analysis must be proceeded before making any related spectrum policy. In this paper, a frequency interference between WLAN and WPAN systems that operate at 2.4 GHz ISM band were analyzed in the physical layer and MAC layer, respectively. From the results, we confirmed that the interference analysis in MAC layer is closer to the measured results. Based on these investigations, we suggest a new co-existence criterion for unlicensed devices in MAC layer.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.10
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• pp.1879-1888
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• 2015

This paper evaluates the adjacent channel coexistence issues between LAA(License Assisted Access) system and other system (e.g. Wi-Fi) system in 5 GHz unlicensed spectrum. LAA is a technology to achieve enhanced data rate by aggregating licensed and unlicensed spectrum using CA(Carrier Aggregation). The coexistence study is essential before deploying LTE in unlicensed spectrum to verify the impact of LTE on the existing system such as Wi-Fi including system in throughput and regulatory aspects. This paper evaluates and analyzes the RF requirements of LTE system using interference analysis of coexistence study when operating at adjacent frequency channel of the Wi-Fi system in order to minimize the impact of LTE system into Wi-Fi system.

• The Korean Society of Law and Medicine
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• v.24 no.1
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• pp.131-155
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• 2023

Medical act divides unlicensed medical practice into medical practice by non-medical practitioners and unlicensed practice by medical practitioners. In the past, it was a common approach to strictly distinguish between western and Korean medicine, but the Supreme Court's Decision of December 22, 2016, Do. 21314, provided a new direction regarding the criteria for determining whether a Korean medicine practitioner is acting outside license. This paper analyzes the new criteria in detail, examines the significance of the new criteria, and explores its impact on the dualistic medical system. The difference between the new criteria and the previous criteria in the precedents is that the judgment is not based on the connection between Korean medicine principles and Western medicine principles. It is an advanced standard that actively accepts the overlap and variability of medical practice, moving away from dichotomous thinking that exclusively distinguishes between Korean medicine and Western medicine.

• Journal of IKEEE
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• v.26 no.1
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• pp.62-66
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• 2022

Recently, there have been many research efforts based on data-based deep learning technologies to deal with the interference problem between heterogeneous wireless communication devices in unlicensed frequency bands. However, existing approaches are commonly based on the use of complex neural network models, which require high computational power, limiting their efficiency in resource-constrained network interfaces and Internet of Things (IoT) devices. In this study, we address the problem of classifying heterogeneous wireless technologies including Wi-Fi and ZigBee in unlicensed spectrum bands. We focus on a data-driven approach that employs a supervised-learning method that uses received signal strength indicator (RSSI) data to train Deep Convolutional Neural Networks (CNNs). We propose a simple measurement methodology for collecting RSSI training data which preserves temporal and spectral properties of the target signal. Real experimental results using an open-source 2.4 GHz wireless development platform Ubertooth show that the proposed sampling method maintains the same accuracy with only a 10% level of sampling data for the same neural network architecture.

• Journal of Communications and Networks
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• v.16 no.1
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• pp.10-17
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• 2014

This work investigates two important performance metrics of underlay cooperative cognitive radio (CR) networks: Interference cumulative distribution function of licensed users and outage probability of unlicensed users. These metrics are thoroughly analyzed in realistic operating conditions such as imperfect fading channel information and strict transmit power constraint, which satisfies interference power constraint and maximum transmit power constraint, over Nakagami-m fading channels. Novel closed-form expressions are derived and subsequently validated extensively through comparisons with respective results from computer simulations. The proposed expressions are rather long but straightforward to handle both analytically and numerically since they are expressed in terms of well known built-in functions. In addition, the offered results provide the following technical insights: i) Channel information imperfection degrades considerably the performance of both unlicensed network in terms of OP and licensed network in terms of interference levels; ii) underlay cooperative CR networks experience the outage saturation phenomenon; iii) the probability that the interference power constraint is satisfied is relatively low and depends significantly on the corresponding fading severity conditions as well as the channel estimation quality; iv) there exists a critical performance trade-off between unlicensed and licensed networks.

• Journal of Advanced Navigation Technology
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• v.12 no.3
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• pp.239-244
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• 2008

In this paper refer to the digital multimedia mobile phone with the combination of broadcasting and the communication the unity of wire and wireless solution that can provide the UMA(Unlicensed Mobile Access) function is added. In UNC(Universal Naming Convention) in the case of CAS(Conditional Access System) is supported, the device(mobile phone) is authenticated through AP and then following the method of broadcasting signal the user can view the wanted contents as long as they want and for this matter the service charge system are proposed.